commit 97891e12bc7432859e25c23e1358694ca6345e38
Author: AdamYuan <[email protected]>
Date: Fri Jul 9 12:28:12 2021 +0800
[dwm]Added winicon patch for dwm
Added a patch to show window icons
diff --git a/dwm.suckless.org/patches/winicon/dwm-winicon-6.2-v1.diff
b/dwm.suckless.org/patches/winicon/dwm-winicon-6.2-v1.diff
new file mode 100644
index 00000000..702bce90
--- /dev/null
+++ b/dwm.suckless.org/patches/winicon/dwm-winicon-6.2-v1.diff
@@ -0,0 +1,2923 @@
+diff --git a/config.def.h b/config.def.h
+index 1c0b587..5385e27 100644
+--- a/config.def.h
++++ b/config.def.h
+@@ -5,6 +5,8 @@ static const unsigned int borderpx = 1; /* border
pixel of windows */
+ static const unsigned int snap = 32; /* snap pixel */
+ static const int showbar = 1; /* 0 means no bar */
+ static const int topbar = 1; /* 0 means bottom bar */
++#define ICONSIZE 20 /* icon size */
++#define ICONSPACING 5 /* space between icon and title */
+ static const char *fonts[] = { "monospace:size=10" };
+ static const char dmenufont[] = "monospace:size=10";
+ static const char col_gray1[] = "#222222";
+diff --git a/config.mk b/config.mk
+index 6d36cb7..39edf93 100644
+--- a/config.mk
++++ b/config.mk
+@@ -22,7 +22,7 @@ FREETYPEINC = /usr/include/freetype2
+
+ # includes and libs
+ INCS = -I${X11INC} -I${FREETYPEINC}
+-LIBS = -L${X11LIB} -lX11 ${XINERAMALIBS} ${FREETYPELIBS}
++LIBS = -L${X11LIB} -lX11 ${XINERAMALIBS} ${FREETYPELIBS} -lm
+
+ # flags
+ CPPFLAGS = -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_POSIX_C_SOURCE=2
-DVERSION=\"${VERSION}\" ${XINERAMAFLAGS}
+diff --git a/drw.c b/drw.c
+index 8fd1ca4..304e269 100644
+--- a/drw.c
++++ b/drw.c
+@@ -378,6 +378,29 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned
int h, unsigned int lp
+ return x + (render ? w : 0);
+ }
+
++static unsigned char
++blend(unsigned char a, unsigned char x, unsigned char y) { return ((255-a)*x
+ a*y) / 255; }
++
++void
++drw_img(Drw *drw, int x, int y, XImage *img, unsigned char *tmp)
++{
++ if (!drw || !drw->scheme)
++ return;
++ int icsz = img->width * img->height, bt = drw->scheme[ColBg].pixel, i;
++ unsigned char *data = (unsigned char *)img->data;
++ unsigned char r = (bt & 0x000000ff), g = (bt & 0x0000ff00)>>8, b = (bt
& 0x00ff0000)>>16;
++ memcpy(tmp, data, icsz << 2);
++ for (i = 0; i < icsz; ++i) {
++ unsigned char a = data[(i<<2)|3];
++ data[(i<<2) ] = blend(a, r, data[(i<<2) ]);
++ data[(i<<2)|1] = blend(a, g, data[(i<<2)|1]);
++ data[(i<<2)|2] = blend(a, b, data[(i<<2)|2]);
++ }
++ XPutImage(drw->dpy, drw->drawable, drw->gc, img, 0, 0, x, y,
img->width, img->height);
++
++ memcpy(data, tmp, icsz << 2);
++}
++
+ void
+ drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h)
+ {
+diff --git a/drw.h b/drw.h
+index 4bcd5ad..5346bec 100644
+--- a/drw.h
++++ b/drw.h
+@@ -52,6 +52,7 @@ void drw_setscheme(Drw *drw, Clr *scm);
+ /* Drawing functions */
+ void drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int
filled, int invert);
+ int drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned
int lpad, const char *text, int invert);
++void drw_img(Drw *drw, int x, int y, XImage *img, unsigned char *tmp);
+
+ /* Map functions */
+ void drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int
h);
+diff --git a/dwm.c b/dwm.c
+index 4465af1..c98796c 100644
+--- a/dwm.c
++++ b/dwm.c
+@@ -28,6 +28,8 @@
+ #include <stdlib.h>
+ #include <string.h>
+ #include <unistd.h>
++#include <limits.h>
++#include <stdint.h>
+ #include <sys/types.h>
+ #include <sys/wait.h>
+ #include <X11/cursorfont.h>
+@@ -60,7 +62,7 @@
+ /* enums */
+ enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
+ enum { SchemeNorm, SchemeSel }; /* color schemes */
+-enum { NetSupported, NetWMName, NetWMState, NetWMCheck,
++enum { NetSupported, NetWMName, NetWMIcon, NetWMState, NetWMCheck,
+ NetWMFullscreen, NetActiveWindow, NetWMWindowType,
+ NetWMWindowTypeDialog, NetClientList, NetLast }; /* EWMH atoms */
+ enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default
atoms */
+@@ -93,6 +95,7 @@ struct Client {
+ int bw, oldbw;
+ unsigned int tags;
+ int isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
++ XImage *icon;
+ Client *next;
+ Client *snext;
+ Monitor *mon;
+@@ -171,6 +174,7 @@ static void focusmon(const Arg *arg);
+ static void focusstack(const Arg *arg);
+ static int getrootptr(int *x, int *y);
+ static long getstate(Window w);
++static XImage *geticonprop(Window win);
+ static int gettextprop(Window w, Atom atom, char *text, unsigned int size);
+ static void grabbuttons(Client *c, int focused);
+ static void grabkeys(void);
+@@ -213,6 +217,7 @@ static void togglebar(const Arg *arg);
+ static void togglefloating(const Arg *arg);
+ static void toggletag(const Arg *arg);
+ static void toggleview(const Arg *arg);
++static void freeicon(Client *c);
+ static void unfocus(Client *c, int setfocus);
+ static void unmanage(Client *c, int destroyed);
+ static void unmapnotify(XEvent *e);
+@@ -224,6 +229,7 @@ static void updatenumlockmask(void);
+ static void updatesizehints(Client *c);
+ static void updatestatus(void);
+ static void updatetitle(Client *c);
++static void updateicon(Client *c);
+ static void updatewindowtype(Client *c);
+ static void updatewmhints(Client *c);
+ static void view(const Arg *arg);
+@@ -731,7 +737,9 @@ drawbar(Monitor *m)
+ if ((w = m->ww - sw - x) > bh) {
+ if (m->sel) {
+ drw_setscheme(drw, scheme[m == selmon ? SchemeSel :
SchemeNorm]);
+- drw_text(drw, x, 0, w, bh, lrpad / 2, m->sel->name, 0);
++ drw_text(drw, x, 0, w, bh, lrpad / 2 + (m->sel->icon ?
m->sel->icon->width + ICONSPACING : 0), m->sel->name, 0);
++ static unsigned char tmp[ICONSIZE * ICONSIZE << 2];
++ if (m->sel->icon) drw_img(drw, x + lrpad / 2, (bh -
m->sel->icon->height) / 2, m->sel->icon, tmp);
+ if (m->sel->isfloating)
+ drw_rect(drw, x + boxs, boxs, boxw, boxw,
m->sel->isfixed, 0);
+ } else {
+@@ -899,6 +907,72 @@ getstate(Window w)
+ return result;
+ }
+
++#define STB_IMAGE_RESIZE_IMPLEMENTATION
++#define STBIR_DEFAULT_FILTER_DOWNSAMPLE STBIR_FILTER_BOX
++#include "stb_image_resize.h"
++
++XImage *
++geticonprop(Window win)
++{
++ int format;
++ unsigned long n, extra, *p = NULL;
++ Atom real;
++
++ if (XGetWindowProperty(dpy, win, netatom[NetWMIcon], 0L, LONG_MAX,
False, AnyPropertyType,
++ &real, &format, &n, &extra,
(unsigned char **)&p) != Success)
++ return NULL;
++ if (n == 0) { XFree(p); return NULL; }
++
++ unsigned long *bstp = NULL, w, h;
++
++ {
++ const unsigned long *end = p + n;
++ unsigned long *i;
++ int bstd = INT_MAX, d, m;
++ for (i = p; i < end; ) {
++ w = *i++; h = *i++;
++ m = w > h ? w : h;
++ if (m >= ICONSIZE && (d = m - ICONSIZE) < bstd) { bstd
= d; bstp = i; }
++ i += (w * h);
++ }
++ if (!bstp) {
++ for (i = p; i < end; ) {
++ w = *i++; h = *i++;
++ m = w > h ? w : h;
++ if ((d = ICONSIZE - m) < bstd) { bstd = d; bstp
= i; }
++ i += (w * h);
++ }
++ }
++ if (!bstp) { XFree(p); return NULL; }
++ }
++
++ w = *(bstp - 2); h = *(bstp - 1);
++
++ int icw, ich;
++ if (w <= h) {
++ ich = ICONSIZE; icw = w * ICONSIZE / h;
++ if (icw < 1) icw = 1;
++ else if (icw > ICONSIZE) icw = ICONSIZE;
++ }
++ else {
++ icw = ICONSIZE; ich = h * ICONSIZE / w;
++ if (ich < 1) ich = 1;
++ else if (ich > ICONSIZE) ich = ICONSIZE;
++ }
++
++ unsigned char *icbuf = malloc(icw * ich << 2); if(!icbuf) { XFree(p);
return NULL; }
++#if ULONG_MAX > UINT32_MAX
++ int i, sz = w * h;
++ uint32_t *bstp32 = (uint32_t *)bstp;
++ for (i = 0; i < sz; ++i) bstp32[i] = bstp[i];
++#endif
++ if (w == icw && h == ich) memcpy(icbuf, bstp, icw * ich << 2);
++ else stbir_resize_uint8((unsigned char *)bstp, w, h, 0, icbuf, icw,
ich, 0, 4);
++ XFree(p);
++
++ return XCreateImage(dpy, DefaultVisual(dpy, screen), DefaultDepth(dpy,
screen), ZPixmap, 0, (char *)icbuf, icw, ich, 32, 0);
++}
++
+ int
+ gettextprop(Window w, Atom atom, char *text, unsigned int size)
+ {
+@@ -1030,6 +1104,8 @@ manage(Window w, XWindowAttributes *wa)
+ c->h = c->oldh = wa->height;
+ c->oldbw = wa->border_width;
+
++ c->icon = NULL;
++ updateicon(c);
+ updatetitle(c);
+ if (XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
+ c->mon = t->mon;
+@@ -1235,11 +1311,18 @@ propertynotify(XEvent *e)
+ drawbars();
+ break;
+ }
++ int ub = 0, rdb = c == c->mon->sel;
+ if (ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
+ updatetitle(c);
+- if (c == c->mon->sel)
+- drawbar(c->mon);
++ ub = rdb;
+ }
++ if (ev->atom == netatom[NetWMIcon]) {
++ updateicon(c);
++ ub = rdb;
++ }
++
++ if (ub) drawbar(c->mon);
++
+ if (ev->atom == netatom[NetWMWindowType])
+ updatewindowtype(c);
+ }
+@@ -1556,6 +1639,7 @@ setup(void)
+ netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW",
False);
+ netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
+ netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
++ netatom[NetWMIcon] = XInternAtom(dpy, "_NET_WM_ICON", False);
+ netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
+ netatom[NetWMCheck] = XInternAtom(dpy, "_NET_SUPPORTING_WM_CHECK",
False);
+ netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN",
False);
+@@ -1746,6 +1830,15 @@ toggleview(const Arg *arg)
+ }
+ }
+
++void
++freeicon(Client *c)
++{
++ if (c->icon) {
++ XDestroyImage(c->icon);
++ c->icon = NULL;
++ }
++}
++
+ void
+ unfocus(Client *c, int setfocus)
+ {
+@@ -1767,6 +1860,7 @@ unmanage(Client *c, int destroyed)
+
+ detach(c);
+ detachstack(c);
++ freeicon(c);
+ if (!destroyed) {
+ wc.border_width = c->oldbw;
+ XGrabServer(dpy); /* avoid race conditions */
+@@ -2001,6 +2095,13 @@ updatetitle(Client *c)
+ strcpy(c->name, broken);
+ }
+
++void
++updateicon(Client *c)
++{
++ freeicon(c);
++ c->icon = geticonprop(c->win);
++}
++
+ void
+ updatewindowtype(Client *c)
+ {
+diff --git a/stb_image_resize.h b/stb_image_resize.h
+new file mode 100644
+index 0000000..42a8efb
+--- /dev/null
++++ b/stb_image_resize.h
+@@ -0,0 +1,2631 @@
++/* stb_image_resize - v0.96 - public domain image resizing
++ by Jorge L Rodriguez (@VinoBS) - 2014
++ http://github.com/nothings/stb
++
++ Written with emphasis on usability, portability, and efficiency. (No
++ SIMD or threads, so it be easily outperformed by libs that use those.)
++ Only scaling and translation is supported, no rotations or shears.
++ Easy API downsamples w/Mitchell filter, upsamples w/cubic interpolation.
++
++ COMPILING & LINKING
++ In one C/C++ file that #includes this file, do this:
++ #define STB_IMAGE_RESIZE_IMPLEMENTATION
++ before the #include. That will create the implementation in that file.
++
++ QUICKSTART
++ stbir_resize_uint8( input_pixels , in_w , in_h , 0,
++ output_pixels, out_w, out_h, 0, num_channels)
++ stbir_resize_float(...)
++ stbir_resize_uint8_srgb( input_pixels , in_w , in_h , 0,
++ output_pixels, out_w, out_h, 0,
++ num_channels , alpha_chan , 0)
++ stbir_resize_uint8_srgb_edgemode(
++ input_pixels , in_w , in_h , 0,
++ output_pixels, out_w, out_h, 0,
++ num_channels , alpha_chan , 0,
STBIR_EDGE_CLAMP)
++ //
WRAP/REFLECT/ZERO
++
++ FULL API
++ See the "header file" section of the source for API documentation.
++
++ ADDITIONAL DOCUMENTATION
++
++ SRGB & FLOATING POINT REPRESENTATION
++ The sRGB functions presume IEEE floating point. If you do not have
++ IEEE floating point, define STBIR_NON_IEEE_FLOAT. This will use
++ a slower implementation.
++
++ MEMORY ALLOCATION
++ The resize functions here perform a single memory allocation using
++ malloc. To control the memory allocation, before the #include that
++ triggers the implementation, do:
++
++ #define STBIR_MALLOC(size,context) ...
++ #define STBIR_FREE(ptr,context) ...
++
++ Each resize function makes exactly one call to malloc/free, so to use
++ temp memory, store the temp memory in the context and return that.
++
++ ASSERT
++ Define STBIR_ASSERT(boolval) to override assert() and not use
assert.h
++
++ OPTIMIZATION
++ Define STBIR_SATURATE_INT to compute clamp values in-range using
++ integer operations instead of float operations. This may be faster
++ on some platforms.
++
++ DEFAULT FILTERS
++ For functions which don't provide explicit control over what filters
++ to use, you can change the compile-time defaults with
++
++ #define STBIR_DEFAULT_FILTER_UPSAMPLE STBIR_FILTER_something
++ #define STBIR_DEFAULT_FILTER_DOWNSAMPLE STBIR_FILTER_something
++
++ See stbir_filter in the header-file section for the list of filters.
++
++ NEW FILTERS
++ A number of 1D filter kernels are used. For a list of
++ supported filters see the stbir_filter enum. To add a new filter,
++ write a filter function and add it to stbir__filter_info_table.
++
++ PROGRESS
++ For interactive use with slow resize operations, you can install
++ a progress-report callback:
++
++ #define STBIR_PROGRESS_REPORT(val) some_func(val)
++
++ The parameter val is a float which goes from 0 to 1 as progress is
made.
++
++ For example:
++
++ static void my_progress_report(float progress);
++ #define STBIR_PROGRESS_REPORT(val) my_progress_report(val)
++
++ #define STB_IMAGE_RESIZE_IMPLEMENTATION
++ #include "stb_image_resize.h"
++
++ static void my_progress_report(float progress)
++ {
++ printf("Progress: %f%%
", progress*100);
++ }
++
++ MAX CHANNELS
++ If your image has more than 64 channels, define STBIR_MAX_CHANNELS
++ to the max you'll have.
++
++ ALPHA CHANNEL
++ Most of the resizing functions provide the ability to control how
++ the alpha channel of an image is processed. The important things
++ to know about this:
++
++ 1. The best mathematically-behaved version of alpha to use is
++ called "premultiplied alpha", in which the other color channels
++ have had the alpha value multiplied in. If you use premultiplied
++ alpha, linear filtering (such as image resampling done by this
++ library, or performed in texture units on GPUs) does the "right
++ thing". While premultiplied alpha is standard in the movie CGI
++ industry, it is still uncommon in the videogame/real-time world.
++
++ If you linearly filter non-premultiplied alpha, strange effects
++ occur. (For example, the 50/50 average of 99% transparent bright
green
++ and 1% transparent black produces 50% transparent dark green when
++ non-premultiplied, whereas premultiplied it produces 50%
++ transparent near-black. The former introduces green energy
++ that doesn't exist in the source image.)
++
++ 2. Artists should not edit premultiplied-alpha images; artists
++ want non-premultiplied alpha images. Thus, art tools generally output
++ non-premultiplied alpha images.
++
++ 3. You will get best results in most cases by converting images
++ to premultiplied alpha before processing them mathematically.
++
++ 4. If you pass the flag STBIR_FLAG_ALPHA_PREMULTIPLIED, the
++ resizer does not do anything special for the alpha channel;
++ it is resampled identically to other channels. This produces
++ the correct results for premultiplied-alpha images, but produces
++ less-than-ideal results for non-premultiplied-alpha images.
++
++ 5. If you do not pass the flag STBIR_FLAG_ALPHA_PREMULTIPLIED,
++ then the resizer weights the contribution of input pixels
++ based on their alpha values, or, equivalently, it multiplies
++ the alpha value into the color channels, resamples, then divides
++ by the resultant alpha value. Input pixels which have alpha=0 do
++ not contribute at all to output pixels unless _all_ of the input
++ pixels affecting that output pixel have alpha=0, in which case
++ the result for that pixel is the same as it would be without
++ STBIR_FLAG_ALPHA_PREMULTIPLIED. However, this is only true for
++ input images in integer formats. For input images in float format,
++ input pixels with alpha=0 have no effect, and output pixels
++ which have alpha=0 will be 0 in all channels. (For float images,
++ you can manually achieve the same result by adding a tiny epsilon
++ value to the alpha channel of every image, and then subtracting
++ or clamping it at the end.)
++
++ 6. You can suppress the behavior described in #5 and make
++ all-0-alpha pixels have 0 in all channels by #defining
++ STBIR_NO_ALPHA_EPSILON.
++
++ 7. You can separately control whether the alpha channel is
++ interpreted as linear or affected by the colorspace. By default
++ it is linear; you almost never want to apply the colorspace.
++ (For example, graphics hardware does not apply sRGB conversion
++ to the alpha channel.)
++
++ CONTRIBUTORS
++ Jorge L Rodriguez: Implementation
++ Sean Barrett: API design, optimizations
++ Aras Pranckevicius: bugfix
++ Nathan Reed: warning fixes
++
++ REVISIONS
++ 0.97 (2020-02-02) fixed warning
++ 0.96 (2019-03-04) fixed warnings
++ 0.95 (2017-07-23) fixed warnings
++ 0.94 (2017-03-18) fixed warnings
++ 0.93 (2017-03-03) fixed bug with certain combinations of heights
++ 0.92 (2017-01-02) fix integer overflow on large (>2GB) images
++ 0.91 (2016-04-02) fix warnings; fix handling of subpixel regions
++ 0.90 (2014-09-17) first released version
++
++ LICENSE
++ See end of file for license information.
++
++ TODO
++ Don't decode all of the image data when only processing a partial tile
++ Don't use full-width decode buffers when only processing a partial tile
++ When processing wide images, break processing into tiles so data fits
in L1 cache
++ Installable filters?
++ Resize that respects alpha test coverage
++ (Reference code: FloatImage::alphaTestCoverage and
FloatImage::scaleAlphaToCoverage:
++
https://code.google.com/p/nvidia-texture-tools/source/browse/trunk/src/nvimage/FloatImage.cpp
)
++*/
++
++#ifndef STBIR_INCLUDE_STB_IMAGE_RESIZE_H
++#define STBIR_INCLUDE_STB_IMAGE_RESIZE_H
++
++#ifdef _MSC_VER
++typedef unsigned char stbir_uint8;
++typedef unsigned short stbir_uint16;
++typedef unsigned int stbir_uint32;
++#else
++#include <stdint.h>
++typedef uint8_t stbir_uint8;
++typedef uint16_t stbir_uint16;
++typedef uint32_t stbir_uint32;
++#endif
++
++#ifndef STBIRDEF
++#ifdef STB_IMAGE_RESIZE_STATIC
++#define STBIRDEF static
++#else
++#ifdef __cplusplus
++#define STBIRDEF extern "C"
++#else
++#define STBIRDEF extern
++#endif
++#endif
++#endif
++
++//////////////////////////////////////////////////////////////////////////////
++//
++// Easy-to-use API:
++//
++// * "input pixels" points to an array of image data with 'num_channels'
channels (e.g. RGB=3, RGBA=4)
++// * input_w is input image width (x-axis), input_h is input image height
(y-axis)
++// * stride is the offset between successive rows of image data in
memory, in bytes. you can
++// specify 0 to mean packed continuously in memory
++// * alpha channel is treated identically to other channels.
++// * colorspace is linear or sRGB as specified by function name
++// * returned result is 1 for success or 0 in case of an error.
++// #define STBIR_ASSERT() to trigger an assert on parameter validation
errors.
++// * Memory required grows approximately linearly with input and output
size, but with
++// discontinuities at input_w == output_w and input_h == output_h.
++// * These functions use a "default" resampling filter defined at compile
time. To change the filter,
++// you can change the compile-time defaults by #defining
STBIR_DEFAULT_FILTER_UPSAMPLE
++// and STBIR_DEFAULT_FILTER_DOWNSAMPLE, or you can use the
medium-complexity API.
++
++STBIRDEF int stbir_resize_uint8( const unsigned char *input_pixels , int
input_w , int input_h , int input_stride_in_bytes,
++ unsigned char *output_pixels, int
output_w, int output_h, int output_stride_in_bytes,
++ int num_channels);
++
++STBIRDEF int stbir_resize_float( const float *input_pixels , int input_w
, int input_h , int input_stride_in_bytes,
++ float *output_pixels, int
output_w, int output_h, int output_stride_in_bytes,
++ int num_channels);
++
++
++// The following functions interpret image data as gamma-corrected sRGB.
++// Specify STBIR_ALPHA_CHANNEL_NONE if you have no alpha channel,
++// or otherwise provide the index of the alpha channel. Flags value
++// of 0 will probably do the right thing if you're not sure what
++// the flags mean.
++
++#define STBIR_ALPHA_CHANNEL_NONE -1
++
++// Set this flag if your texture has premultiplied alpha. Otherwise, stbir
will
++// use alpha-weighted resampling (effectively premultiplying, resampling,
++// then unpremultiplying).
++#define STBIR_FLAG_ALPHA_PREMULTIPLIED (1 << 0)
++// The specified alpha channel should be handled as gamma-corrected value even
++// when doing sRGB operations.
++#define STBIR_FLAG_ALPHA_USES_COLORSPACE (1 << 1)
++
++STBIRDEF int stbir_resize_uint8_srgb(const unsigned char *input_pixels , int
input_w , int input_h , int input_stride_in_bytes,
++ unsigned char *output_pixels, int
output_w, int output_h, int output_stride_in_bytes,
++ int num_channels, int alpha_channel, int
flags);
++
++
++typedef enum
++{
++ STBIR_EDGE_CLAMP = 1,
++ STBIR_EDGE_REFLECT = 2,
++ STBIR_EDGE_WRAP = 3,
++ STBIR_EDGE_ZERO = 4,
++} stbir_edge;
++
++// This function adds the ability to specify how requests to sample off the
edge of the image are handled.
++STBIRDEF int stbir_resize_uint8_srgb_edgemode(const unsigned char
*input_pixels , int input_w , int input_h , int input_stride_in_bytes,
++ unsigned char
*output_pixels, int output_w, int output_h, int output_stride_in_bytes,
++ int num_channels, int
alpha_channel, int flags,
++ stbir_edge edge_wrap_mode);
++
++//////////////////////////////////////////////////////////////////////////////
++//
++// Medium-complexity API
++//
++// This extends the easy-to-use API as follows:
++//
++// * Alpha-channel can be processed separately
++// * If alpha_channel is not STBIR_ALPHA_CHANNEL_NONE
++// * Alpha channel will not be gamma corrected (unless
flags&STBIR_FLAG_GAMMA_CORRECT)
++// * Filters will be weighted by alpha channel (unless
flags&STBIR_FLAG_ALPHA_PREMULTIPLIED)
++// * Filter can be selected explicitly
++// * uint16 image type
++// * sRGB colorspace available for all types
++// * context parameter for passing to STBIR_MALLOC
++
++typedef enum
++{
++ STBIR_FILTER_DEFAULT = 0, // use same filter type that easy-to-use
API chooses
++ STBIR_FILTER_BOX = 1, // A trapezoid w/1-pixel wide ramps, same
result as box for integer scale ratios
++ STBIR_FILTER_TRIANGLE = 2, // On upsampling, produces same results
as bilinear texture filtering
++ STBIR_FILTER_CUBICBSPLINE = 3, // The cubic b-spline (aka
Mitchell-Netrevalli with B=1,C=0), gaussian-esque
++ STBIR_FILTER_CATMULLROM = 4, // An interpolating cubic spline
++ STBIR_FILTER_MITCHELL = 5, // Mitchell-Netrevalli filter with B=1/3,
C=1/3
++} stbir_filter;
++
++typedef enum
++{
++ STBIR_COLORSPACE_LINEAR,
++ STBIR_COLORSPACE_SRGB,
++
++ STBIR_MAX_COLORSPACES,
++} stbir_colorspace;
++
++// The following functions are all identical except for the type of the image
data
++
++STBIRDEF int stbir_resize_uint8_generic( const unsigned char *input_pixels ,
int input_w , int input_h , int input_stride_in_bytes,
++ unsigned char *output_pixels,
int output_w, int output_h, int output_stride_in_bytes,
++ int num_channels, int alpha_channel,
int flags,
++ stbir_edge edge_wrap_mode,
stbir_filter filter, stbir_colorspace space,
++ void *alloc_context);
++
++STBIRDEF int stbir_resize_uint16_generic(const stbir_uint16 *input_pixels ,
int input_w , int input_h , int input_stride_in_bytes,
++ stbir_uint16 *output_pixels ,
int output_w, int output_h, int output_stride_in_bytes,
++ int num_channels, int alpha_channel,
int flags,
++ stbir_edge edge_wrap_mode,
stbir_filter filter, stbir_colorspace space,
++ void *alloc_context);
++
++STBIRDEF int stbir_resize_float_generic( const float *input_pixels ,
int input_w , int input_h , int input_stride_in_bytes,
++ float *output_pixels ,
int output_w, int output_h, int output_stride_in_bytes,
++ int num_channels, int alpha_channel,
int flags,
++ stbir_edge edge_wrap_mode,
stbir_filter filter, stbir_colorspace space,
++ void *alloc_context);
++
++
++
++//////////////////////////////////////////////////////////////////////////////
++//
++// Full-complexity API
++//
++// This extends the medium API as follows:
++//
++// * uint32 image type
++// * not typesafe
++// * separate filter types for each axis
++// * separate edge modes for each axis
++// * can specify scale explicitly for subpixel correctness
++// * can specify image source tile using texture coordinates
++
++typedef enum
++{
++ STBIR_TYPE_UINT8 ,
++ STBIR_TYPE_UINT16,
++ STBIR_TYPE_UINT32,
++ STBIR_TYPE_FLOAT ,
++
++ STBIR_MAX_TYPES
++} stbir_datatype;
++
++STBIRDEF int stbir_resize( const void *input_pixels , int input_w ,
int input_h , int input_stride_in_bytes,
++ void *output_pixels, int output_w,
int output_h, int output_stride_in_bytes,
++ stbir_datatype datatype,
++ int num_channels, int alpha_channel, int
flags,
++ stbir_edge edge_mode_horizontal,
stbir_edge edge_mode_vertical,
++ stbir_filter filter_horizontal,
stbir_filter filter_vertical,
++ stbir_colorspace space, void
*alloc_context);
++
++STBIRDEF int stbir_resize_subpixel(const void *input_pixels , int input_w ,
int input_h , int input_stride_in_bytes,
++ void *output_pixels, int output_w,
int output_h, int output_stride_in_bytes,
++ stbir_datatype datatype,
++ int num_channels, int alpha_channel, int
flags,
++ stbir_edge edge_mode_horizontal,
stbir_edge edge_mode_vertical,
++ stbir_filter filter_horizontal,
stbir_filter filter_vertical,
++ stbir_colorspace space, void
*alloc_context,
++ float x_scale, float y_scale,
++ float x_offset, float y_offset);
++
++STBIRDEF int stbir_resize_region( const void *input_pixels , int input_w ,
int input_h , int input_stride_in_bytes,
++ void *output_pixels, int output_w,
int output_h, int output_stride_in_bytes,
++ stbir_datatype datatype,
++ int num_channels, int alpha_channel, int
flags,
++ stbir_edge edge_mode_horizontal,
stbir_edge edge_mode_vertical,
++ stbir_filter filter_horizontal,
stbir_filter filter_vertical,
++ stbir_colorspace space, void
*alloc_context,
++ float s0, float t0, float s1, float t1);
++// (s0, t0) & (s1, t1) are the top-left and bottom right corner (uv
addressing style: [0, 1]x[0, 1]) of a region of the input image to use.
++
++//
++//
++//// end header file /////////////////////////////////////////////////////
++#endif // STBIR_INCLUDE_STB_IMAGE_RESIZE_H
++
++
++
++
++
++#ifdef STB_IMAGE_RESIZE_IMPLEMENTATION
++
++#ifndef STBIR_ASSERT
++#include <assert.h>
++#define STBIR_ASSERT(x) assert(x)
++#endif
++
++// For memset
++#include <string.h>
++
++#include <math.h>
++
++#ifndef STBIR_MALLOC
++#include <stdlib.h>
++// use comma operator to evaluate c, to avoid "unused parameter" warnings
++#define STBIR_MALLOC(size,c) ((void)(c), malloc(size))
++#define STBIR_FREE(ptr,c) ((void)(c), free(ptr))
++#endif
++
++#ifndef _MSC_VER
++#ifdef __cplusplus
++#define stbir__inline inline
++#else
++#define stbir__inline
++#endif
++#else
++#define stbir__inline __forceinline
++#endif
++
++
++// should produce compiler error if size is wrong
++typedef unsigned char stbir__validate_uint32[sizeof(stbir_uint32) == 4 ? 1 :
-1];
++
++#ifdef _MSC_VER
++#define STBIR__NOTUSED(v) (void)(v)
++#else
++#define STBIR__NOTUSED(v) (void)sizeof(v)
++#endif
++
++#define STBIR__ARRAY_SIZE(a) (sizeof((a))/sizeof((a)[0]))
++
++#ifndef STBIR_DEFAULT_FILTER_UPSAMPLE
++#define STBIR_DEFAULT_FILTER_UPSAMPLE STBIR_FILTER_CATMULLROM
++#endif
++
++#ifndef STBIR_DEFAULT_FILTER_DOWNSAMPLE
++#define STBIR_DEFAULT_FILTER_DOWNSAMPLE STBIR_FILTER_MITCHELL
++#endif
++
++#ifndef STBIR_PROGRESS_REPORT
++#define STBIR_PROGRESS_REPORT(float_0_to_1)
++#endif
++
++#ifndef STBIR_MAX_CHANNELS
++#define STBIR_MAX_CHANNELS 64
++#endif
++
++#if STBIR_MAX_CHANNELS > 65536
++#error "Too many channels; STBIR_MAX_CHANNELS must be no more than 65536."
++// because we store the indices in 16-bit variables
++#endif
++
++// This value is added to alpha just before premultiplication to avoid
++// zeroing out color values. It is equivalent to 2^-80. If you don't want
++// that behavior (it may interfere if you have floating point images with
++// very small alpha values) then you can define STBIR_NO_ALPHA_EPSILON to
++// disable it.
++#ifndef STBIR_ALPHA_EPSILON
++#define STBIR_ALPHA_EPSILON ((float)1 / (1 << 20) / (1 << 20) / (1 << 20) /
(1 << 20))
++#endif
++
++
++
++#ifdef _MSC_VER
++#define STBIR__UNUSED_PARAM(v) (void)(v)
++#else
++#define STBIR__UNUSED_PARAM(v) (void)sizeof(v)
++#endif
++
++// must match stbir_datatype
++static unsigned char stbir__type_size[] = {
++ 1, // STBIR_TYPE_UINT8
++ 2, // STBIR_TYPE_UINT16
++ 4, // STBIR_TYPE_UINT32
++ 4, // STBIR_TYPE_FLOAT
++};
++
++// Kernel function centered at 0
++typedef float (stbir__kernel_fn)(float x, float scale);
++typedef float (stbir__support_fn)(float scale);
++
++typedef struct
++{
++ stbir__kernel_fn* kernel;
++ stbir__support_fn* support;
++} stbir__filter_info;
++
++// When upsampling, the contributors are which source pixels contribute.
++// When downsampling, the contributors are which destination pixels are
contributed to.
++typedef struct
++{
++ int n0; // First contributing pixel
++ int n1; // Last contributing pixel
++} stbir__contributors;
++
++typedef struct
++{
++ const void* input_data;
++ int input_w;
++ int input_h;
++ int input_stride_bytes;
++
++ void* output_data;
++ int output_w;
++ int output_h;
++ int output_stride_bytes;
++
++ float s0, t0, s1, t1;
++
++ float horizontal_shift; // Units: output pixels
++ float vertical_shift; // Units: output pixels
++ float horizontal_scale;
++ float vertical_scale;
++
++ int channels;
++ int alpha_channel;
++ stbir_uint32 flags;
++ stbir_datatype type;
++ stbir_filter horizontal_filter;
++ stbir_filter vertical_filter;
++ stbir_edge edge_horizontal;
++ stbir_edge edge_vertical;
++ stbir_colorspace colorspace;
++
++ stbir__contributors* horizontal_contributors;
++ float* horizontal_coefficients;
++
++ stbir__contributors* vertical_contributors;
++ float* vertical_coefficients;
++
++ int decode_buffer_pixels;
++ float* decode_buffer;
++
++ float* horizontal_buffer;
++
++ // cache these because ceil/floor are inexplicably showing up in profile
++ int horizontal_coefficient_width;
++ int vertical_coefficient_width;
++ int horizontal_filter_pixel_width;
++ int vertical_filter_pixel_width;
++ int horizontal_filter_pixel_margin;
++ int vertical_filter_pixel_margin;
++ int horizontal_num_contributors;
++ int vertical_num_contributors;
++
++ int ring_buffer_length_bytes; // The length of an individual entry in
the ring buffer. The total number of ring buffers is
stbir__get_filter_pixel_width(filter)
++ int ring_buffer_num_entries; // Total number of entries in the ring
buffer.
++ int ring_buffer_first_scanline;
++ int ring_buffer_last_scanline;
++ int ring_buffer_begin_index; // first_scanline is at this index in the
ring buffer
++ float* ring_buffer;
++
++ float* encode_buffer; // A temporary buffer to store floats so we don't
lose precision while we do multiply-adds.
++
++ int horizontal_contributors_size;
++ int horizontal_coefficients_size;
++ int vertical_contributors_size;
++ int vertical_coefficients_size;
++ int decode_buffer_size;
++ int horizontal_buffer_size;
++ int ring_buffer_size;
++ int encode_buffer_size;
++} stbir__info;
++
++
++static const float stbir__max_uint8_as_float = 255.0f;
++static const float stbir__max_uint16_as_float = 65535.0f;
++static const double stbir__max_uint32_as_float = 4294967295.0;
++
++
++static stbir__inline int stbir__min(int a, int b)
++{
++ return a < b ? a : b;
++}
++
++static stbir__inline float stbir__saturate(float x)
++{
++ if (x < 0)
++ return 0;
++
++ if (x > 1)
++ return 1;
++
++ return x;
++}
++
++#ifdef STBIR_SATURATE_INT
++static stbir__inline stbir_uint8 stbir__saturate8(int x)
++{
++ if ((unsigned int) x <= 255)
++ return x;
++
++ if (x < 0)
++ return 0;
++
++ return 255;
++}
++
++static stbir__inline stbir_uint16 stbir__saturate16(int x)
++{
++ if ((unsigned int) x <= 65535)
++ return x;
++
++ if (x < 0)
++ return 0;
++
++ return 65535;
++}
++#endif
++
++static float stbir__srgb_uchar_to_linear_float[256] = {
++ 0.000000f, 0.000304f, 0.000607f, 0.000911f, 0.001214f, 0.001518f,
0.001821f, 0.002125f, 0.002428f, 0.002732f, 0.003035f,
++ 0.003347f, 0.003677f, 0.004025f, 0.004391f, 0.004777f, 0.005182f,
0.005605f, 0.006049f, 0.006512f, 0.006995f, 0.007499f,
++ 0.008023f, 0.008568f, 0.009134f, 0.009721f, 0.010330f, 0.010960f,
0.011612f, 0.012286f, 0.012983f, 0.013702f, 0.014444f,
++ 0.015209f, 0.015996f, 0.016807f, 0.017642f, 0.018500f, 0.019382f,
0.020289f, 0.021219f, 0.022174f, 0.023153f, 0.024158f,
++ 0.025187f, 0.026241f, 0.027321f, 0.028426f, 0.029557f, 0.030713f,
0.031896f, 0.033105f, 0.034340f, 0.035601f, 0.036889f,
++ 0.038204f, 0.039546f, 0.040915f, 0.042311f, 0.043735f, 0.045186f,
0.046665f, 0.048172f, 0.049707f, 0.051269f, 0.052861f,
++ 0.054480f, 0.056128f, 0.057805f, 0.059511f, 0.061246f, 0.063010f,
0.064803f, 0.066626f, 0.068478f, 0.070360f, 0.072272f,
++ 0.074214f, 0.076185f, 0.078187f, 0.080220f, 0.082283f, 0.084376f,
0.086500f, 0.088656f, 0.090842f, 0.093059f, 0.095307f,
++ 0.097587f, 0.099899f, 0.102242f, 0.104616f, 0.107023f, 0.109462f,
0.111932f, 0.114435f, 0.116971f, 0.119538f, 0.122139f,
++ 0.124772f, 0.127438f, 0.130136f, 0.132868f, 0.135633f, 0.138432f,
0.141263f, 0.144128f, 0.147027f, 0.149960f, 0.152926f,
++ 0.155926f, 0.158961f, 0.162029f, 0.165132f, 0.168269f, 0.171441f,
0.174647f, 0.177888f, 0.181164f, 0.184475f, 0.187821f,
++ 0.191202f, 0.194618f, 0.198069f, 0.201556f, 0.205079f, 0.208637f,
0.212231f, 0.215861f, 0.219526f, 0.223228f, 0.226966f,
++ 0.230740f, 0.234551f, 0.238398f, 0.242281f, 0.246201f, 0.250158f,
0.254152f, 0.258183f, 0.262251f, 0.266356f, 0.270498f,
++ 0.274677f, 0.278894f, 0.283149f, 0.287441f, 0.291771f, 0.296138f,
0.300544f, 0.304987f, 0.309469f, 0.313989f, 0.318547f,
++ 0.323143f, 0.327778f, 0.332452f, 0.337164f, 0.341914f, 0.346704f,
0.351533f, 0.356400f, 0.361307f, 0.366253f, 0.371238f,
++ 0.376262f, 0.381326f, 0.386430f, 0.391573f, 0.396755f, 0.401978f,
0.407240f, 0.412543f, 0.417885f, 0.423268f, 0.428691f,
++ 0.434154f, 0.439657f, 0.445201f, 0.450786f, 0.456411f, 0.462077f,
0.467784f, 0.473532f, 0.479320f, 0.485150f, 0.491021f,
++ 0.496933f, 0.502887f, 0.508881f, 0.514918f, 0.520996f, 0.527115f,
0.533276f, 0.539480f, 0.545725f, 0.552011f, 0.558340f,
++ 0.564712f, 0.571125f, 0.577581f, 0.584078f, 0.590619f, 0.597202f,
0.603827f, 0.610496f, 0.617207f, 0.623960f, 0.630757f,
++ 0.637597f, 0.644480f, 0.651406f, 0.658375f, 0.665387f, 0.672443f,
0.679543f, 0.686685f, 0.693872f, 0.701102f, 0.708376f,
++ 0.715694f, 0.723055f, 0.730461f, 0.737911f, 0.745404f, 0.752942f,
0.760525f, 0.768151f, 0.775822f, 0.783538f, 0.791298f,
++ 0.799103f, 0.806952f, 0.814847f, 0.822786f, 0.830770f, 0.838799f,
0.846873f, 0.854993f, 0.863157f, 0.871367f, 0.879622f,
++ 0.887923f, 0.896269f, 0.904661f, 0.913099f, 0.921582f, 0.930111f,
0.938686f, 0.947307f, 0.955974f, 0.964686f, 0.973445f,
++ 0.982251f, 0.991102f, 1.0f
++};
++
++static float stbir__srgb_to_linear(float f)
++{
++ if (f <= 0.04045f)
++ return f / 12.92f;
++ else
++ return (float)pow((f + 0.055f) / 1.055f, 2.4f);
++}
++
++static float stbir__linear_to_srgb(float f)
++{
++ if (f <= 0.0031308f)
++ return f * 12.92f;
++ else
++ return 1.055f * (float)pow(f, 1 / 2.4f) - 0.055f;
++}
++
++#ifndef STBIR_NON_IEEE_FLOAT
++// From https://gist.github.com/rygorous/2203834
++
++typedef union
++{
++ stbir_uint32 u;
++ float f;
++} stbir__FP32;
++
++static const stbir_uint32 fp32_to_srgb8_tab4[104] = {
++ 0x0073000d, 0x007a000d, 0x0080000d, 0x0087000d, 0x008d000d, 0x0094000d,
0x009a000d, 0x00a1000d,
++ 0x00a7001a, 0x00b4001a, 0x00c1001a, 0x00ce001a, 0x00da001a, 0x00e7001a,
0x00f4001a, 0x0101001a,
++ 0x010e0033, 0x01280033, 0x01410033, 0x015b0033, 0x01750033, 0x018f0033,
0x01a80033, 0x01c20033,
++ 0x01dc0067, 0x020f0067, 0x02430067, 0x02760067, 0x02aa0067, 0x02dd0067,
0x03110067, 0x03440067,
++ 0x037800ce, 0x03df00ce, 0x044600ce, 0x04ad00ce, 0x051400ce, 0x057b00c5,
0x05dd00bc, 0x063b00b5,
++ 0x06970158, 0x07420142, 0x07e30130, 0x087b0120, 0x090b0112, 0x09940106,
0x0a1700fc, 0x0a9500f2,
++ 0x0b0f01cb, 0x0bf401ae, 0x0ccb0195, 0x0d950180, 0x0e56016e, 0x0f0d015e,
0x0fbc0150, 0x10630143,
++ 0x11070264, 0x1238023e, 0x1357021d, 0x14660201, 0x156601e9, 0x165a01d3,
0x174401c0, 0x182401af,
++ 0x18fe0331, 0x1a9602fe, 0x1c1502d2, 0x1d7e02ad, 0x1ed4028d, 0x201a0270,
0x21520256, 0x227d0240,
++ 0x239f0443, 0x25c003fe, 0x27bf03c4, 0x29a10392, 0x2b6a0367, 0x2d1d0341,
0x2ebe031f, 0x304d0300,
++ 0x31d105b0, 0x34a80555, 0x37520507, 0x39d504c5, 0x3c37048b, 0x3e7c0458,
0x40a8042a, 0x42bd0401,
++ 0x44c20798, 0x488e071e, 0x4c1c06b6, 0x4f76065d, 0x52a50610, 0x55ac05cc,
0x5892058f, 0x5b590559,
++ 0x5e0c0a23, 0x631c0980, 0x67db08f6, 0x6c55087f, 0x70940818, 0x74a007bd,
0x787d076c, 0x7c330723,
++};
++
++static stbir_uint8 stbir__linear_to_srgb_uchar(float in)
++{
++ static const stbir__FP32 almostone = { 0x3f7fffff }; // 1-eps
++ static const stbir__FP32 minval = { (127-13) << 23 };
++ stbir_uint32 tab,bias,scale,t;
++ stbir__FP32 f;
++
++ // Clamp to [2^(-13), 1-eps]; these two values map to 0 and 1,
respectively.
++ // The tests are carefully written so that NaNs map to 0, same as in the
reference
++ // implementation.
++ if (!(in > minval.f)) // written this way to catch NaNs
++ in = minval.f;
++ if (in > almostone.f)
++ in = almostone.f;
++
++ // Do the table lookup and unpack bias, scale
++ f.f = in;
++ tab = fp32_to_srgb8_tab4[(f.u - minval.u) >> 20];
++ bias = (tab >> 16) << 9;
++ scale = tab & 0xffff;
++
++ // Grab next-highest mantissa bits and perform linear interpolation
++ t = (f.u >> 12) & 0xff;
++ return (unsigned char) ((bias + scale*t) >> 16);
++}
++
++#else
++// sRGB transition values, scaled by 1<<28
++static int stbir__srgb_offset_to_linear_scaled[256] =
++{
++ 0, 40738, 122216, 203693, 285170, 366648,
448125, 529603,
++ 611080, 692557, 774035, 855852, 942009, 1033024,
1128971, 1229926,
++ 1335959, 1447142, 1563542, 1685229, 1812268, 1944725,
2082664, 2226148,
++ 2375238, 2529996, 2690481, 2856753, 3028870, 3206888,
3390865, 3580856,
++ 3776916, 3979100, 4187460, 4402049, 4622919, 4850123,
5083710, 5323731,
++ 5570236, 5823273, 6082892, 6349140, 6622065, 6901714,
7188133, 7481369,
++ 7781466, 8088471, 8402427, 8723380, 9051372, 9386448,
9728650, 10078021,
++ 10434603, 10798439, 11169569, 11548036, 11933879, 12327139,
12727857, 13136073,
++ 13551826, 13975156, 14406100, 14844697, 15290987, 15745007,
16206795, 16676389,
++ 17153826, 17639142, 18132374, 18633560, 19142734, 19659934,
20185196, 20718552,
++ 21260042, 21809696, 22367554, 22933648, 23508010, 24090680,
24681686, 25281066,
++ 25888850, 26505076, 27129772, 27762974, 28404716, 29055026,
29713942, 30381490,
++ 31057708, 31742624, 32436272, 33138682, 33849884, 34569912,
35298800, 36036568,
++ 36783260, 37538896, 38303512, 39077136, 39859796, 40651528,
41452360, 42262316,
++ 43081432, 43909732, 44747252, 45594016, 46450052, 47315392,
48190064, 49074096,
++ 49967516, 50870356, 51782636, 52704392, 53635648, 54576432,
55526772, 56486700,
++ 57456236, 58435408, 59424248, 60422780, 61431036, 62449032,
63476804, 64514376,
++ 65561776, 66619028, 67686160, 68763192, 69850160, 70947088,
72053992, 73170912,
++ 74297864, 75434880, 76581976, 77739184, 78906536, 80084040,
81271736, 82469648,
++ 83677792, 84896192, 86124888, 87363888, 88613232, 89872928,
91143016, 92423512,
++ 93714432, 95015816, 96327688, 97650056, 98982952, 100326408,
101680440, 103045072,
++ 104420320, 105806224, 107202800, 108610064, 110028048, 111456776,
112896264, 114346544,
++ 115807632, 117279552, 118762328, 120255976, 121760536, 123276016,
124802440, 126339832,
++ 127888216, 129447616, 131018048, 132599544, 134192112, 135795792,
137410592, 139036528,
++ 140673648, 142321952, 143981456, 145652208, 147334208, 149027488,
150732064, 152447968,
++ 154175200, 155913792, 157663776, 159425168, 161197984, 162982240,
164777968, 166585184,
++ 168403904, 170234160, 172075968, 173929344, 175794320, 177670896,
179559120, 181458992,
++ 183370528, 185293776, 187228736, 189175424, 191133888, 193104112,
195086128, 197079968,
++ 199085648, 201103184, 203132592, 205173888, 207227120, 209292272,
211369392, 213458480,
++ 215559568, 217672656, 219797792, 221934976, 224084240, 226245600,
228419056, 230604656,
++ 232802400, 235012320, 237234432, 239468736, 241715280, 243974080,
246245120, 248528464,
++ 250824112, 253132064, 255452368, 257785040, 260130080, 262487520,
264857376, 267239664,
++};
++
++static stbir_uint8 stbir__linear_to_srgb_uchar(float f)
++{
++ int x = (int) (f * (1 << 28)); // has headroom so you don't need to clamp
++ int v = 0;
++ int i;
++
++ // Refine the guess with a short binary search.
++ i = v + 128; if (x >= stbir__srgb_offset_to_linear_scaled[i]) v = i;
++ i = v + 64; if (x >= stbir__srgb_offset_to_linear_scaled[i]) v = i;
++ i = v + 32; if (x >= stbir__srgb_offset_to_linear_scaled[i]) v = i;
++ i = v + 16; if (x >= stbir__srgb_offset_to_linear_scaled[i]) v = i;
++ i = v + 8; if (x >= stbir__srgb_offset_to_linear_scaled[i]) v = i;
++ i = v + 4; if (x >= stbir__srgb_offset_to_linear_scaled[i]) v = i;
++ i = v + 2; if (x >= stbir__srgb_offset_to_linear_scaled[i]) v = i;
++ i = v + 1; if (x >= stbir__srgb_offset_to_linear_scaled[i]) v = i;
++
++ return (stbir_uint8) v;
++}
++#endif
++
++static float stbir__filter_trapezoid(float x, float scale)
++{
++ float halfscale = scale / 2;
++ float t = 0.5f + halfscale;
++ STBIR_ASSERT(scale <= 1);
++
++ x = (float)fabs(x);
++
++ if (x >= t)
++ return 0;
++ else
++ {
++ float r = 0.5f - halfscale;
++ if (x <= r)
++ return 1;
++ else
++ return (t - x) / scale;
++ }
++}
++
++static float stbir__support_trapezoid(float scale)
++{
++ STBIR_ASSERT(scale <= 1);
++ return 0.5f + scale / 2;
++}
++
++static float stbir__filter_triangle(float x, float s)
++{
++ STBIR__UNUSED_PARAM(s);
++
++ x = (float)fabs(x);
++
++ if (x <= 1.0f)
++ return 1 - x;
++ else
++ return 0;
++}
++
++static float stbir__filter_cubic(float x, float s)
++{
++ STBIR__UNUSED_PARAM(s);
++
++ x = (float)fabs(x);
++
++ if (x < 1.0f)
++ return (4 + x*x*(3*x - 6))/6;
++ else if (x < 2.0f)
++ return (8 + x*(-12 + x*(6 - x)))/6;
++
++ return (0.0f);
++}
++
++static float stbir__filter_catmullrom(float x, float s)
++{
++ STBIR__UNUSED_PARAM(s);
++
++ x = (float)fabs(x);
++
++ if (x < 1.0f)
++ return 1 - x*x*(2.5f - 1.5f*x);
++ else if (x < 2.0f)
++ return 2 - x*(4 + x*(0.5f*x - 2.5f));
++
++ return (0.0f);
++}
++
++static float stbir__filter_mitchell(float x, float s)
++{
++ STBIR__UNUSED_PARAM(s);
++
++ x = (float)fabs(x);
++
++ if (x < 1.0f)
++ return (16 + x*x*(21 * x - 36))/18;
++ else if (x < 2.0f)
++ return (32 + x*(-60 + x*(36 - 7*x)))/18;
++
++ return (0.0f);
++}
++
++static float stbir__support_zero(float s)
++{
++ STBIR__UNUSED_PARAM(s);
++ return 0;
++}
++
++static float stbir__support_one(float s)
++{
++ STBIR__UNUSED_PARAM(s);
++ return 1;
++}
++
++static float stbir__support_two(float s)
++{
++ STBIR__UNUSED_PARAM(s);
++ return 2;
++}
++
++static stbir__filter_info stbir__filter_info_table[] = {
++ { NULL, stbir__support_zero },
++ { stbir__filter_trapezoid, stbir__support_trapezoid },
++ { stbir__filter_triangle, stbir__support_one },
++ { stbir__filter_cubic, stbir__support_two },
++ { stbir__filter_catmullrom, stbir__support_two },
++ { stbir__filter_mitchell, stbir__support_two },
++};
++
++stbir__inline static int stbir__use_upsampling(float ratio)
++{
++ return ratio > 1;
++}
++
++stbir__inline static int stbir__use_width_upsampling(stbir__info* stbir_info)
++{
++ return stbir__use_upsampling(stbir_info->horizontal_scale);
++}
++
++stbir__inline static int stbir__use_height_upsampling(stbir__info* stbir_info)
++{
++ return stbir__use_upsampling(stbir_info->vertical_scale);
++}
++
++// This is the maximum number of input samples that can affect an output
sample
++// with the given filter
++static int stbir__get_filter_pixel_width(stbir_filter filter, float scale)
++{
++ STBIR_ASSERT(filter != 0);
++ STBIR_ASSERT(filter < STBIR__ARRAY_SIZE(stbir__filter_info_table));
++
++ if (stbir__use_upsampling(scale))
++ return (int)ceil(stbir__filter_info_table[filter].support(1/scale) *
2);
++ else
++ return (int)ceil(stbir__filter_info_table[filter].support(scale) * 2
/ scale);
++}
++
++// This is how much to expand buffers to account for filters seeking outside
++// the image boundaries.
++static int stbir__get_filter_pixel_margin(stbir_filter filter, float scale)
++{
++ return stbir__get_filter_pixel_width(filter, scale) / 2;
++}
++
++static int stbir__get_coefficient_width(stbir_filter filter, float scale)
++{
++ if (stbir__use_upsampling(scale))
++ return (int)ceil(stbir__filter_info_table[filter].support(1 / scale)
* 2);
++ else
++ return (int)ceil(stbir__filter_info_table[filter].support(scale) * 2);
++}
++
++static int stbir__get_contributors(float scale, stbir_filter filter, int
input_size, int output_size)
++{
++ if (stbir__use_upsampling(scale))
++ return output_size;
++ else
++ return (input_size + stbir__get_filter_pixel_margin(filter, scale) *
2);
++}
++
++static int stbir__get_total_horizontal_coefficients(stbir__info* info)
++{
++ return info->horizontal_num_contributors
++ * stbir__get_coefficient_width (info->horizontal_filter,
info->horizontal_scale);
++}
++
++static int stbir__get_total_vertical_coefficients(stbir__info* info)
++{
++ return info->vertical_num_contributors
++ * stbir__get_coefficient_width (info->vertical_filter,
info->vertical_scale);
++}
++
++static stbir__contributors* stbir__get_contributor(stbir__contributors*
contributors, int n)
++{
++ return &contributors[n];
++}
++
++// For perf reasons this code is duplicated in
stbir__resample_horizontal_upsample/downsample,
++// if you change it here change it there too.
++static float* stbir__get_coefficient(float* coefficients, stbir_filter
filter, float scale, int n, int c)
++{
++ int width = stbir__get_coefficient_width(filter, scale);
++ return &coefficients[width*n + c];
++}
++
++static int stbir__edge_wrap_slow(stbir_edge edge, int n, int max)
++{
++ switch (edge)
++ {
++ case STBIR_EDGE_ZERO:
++ return 0; // we'll decode the wrong pixel here, and then overwrite
with 0s later
++
++ case STBIR_EDGE_CLAMP:
++ if (n < 0)
++ return 0;
++
++ if (n >= max)
++ return max - 1;
++
++ return n; // NOTREACHED
++
++ case STBIR_EDGE_REFLECT:
++ {
++ if (n < 0)
++ {
++ if (n < max)
++ return -n;
++ else
++ return max - 1;
++ }
++
++ if (n >= max)
++ {
++ int max2 = max * 2;
++ if (n >= max2)
++ return 0;
++ else
++ return max2 - n - 1;
++ }
++
++ return n; // NOTREACHED
++ }
++
++ case STBIR_EDGE_WRAP:
++ if (n >= 0)
++ return (n % max);
++ else
++ {
++ int m = (-n) % max;
++
++ if (m != 0)
++ m = max - m;
++
++ return (m);
++ }
++ // NOTREACHED
++
++ default:
++ STBIR_ASSERT(!"Unimplemented edge type");
++ return 0;
++ }
++}
++
++stbir__inline static int stbir__edge_wrap(stbir_edge edge, int n, int max)
++{
++ // avoid per-pixel switch
++ if (n >= 0 && n < max)
++ return n;
++ return stbir__edge_wrap_slow(edge, n, max);
++}
++
++// What input pixels contribute to this output pixel?
++static void stbir__calculate_sample_range_upsample(int n, float
out_filter_radius, float scale_ratio, float out_shift, int* in_first_pixel,
int* in_last_pixel, float* in_center_of_out)
++{
++ float out_pixel_center = (float)n + 0.5f;
++ float out_pixel_influence_lowerbound = out_pixel_center -
out_filter_radius;
++ float out_pixel_influence_upperbound = out_pixel_center +
out_filter_radius;
++
++ float in_pixel_influence_lowerbound = (out_pixel_influence_lowerbound +
out_shift) / scale_ratio;
++ float in_pixel_influence_upperbound = (out_pixel_influence_upperbound +
out_shift) / scale_ratio;
++
++ *in_center_of_out = (out_pixel_center + out_shift) / scale_ratio;
++ *in_first_pixel = (int)(floor(in_pixel_influence_lowerbound + 0.5));
++ *in_last_pixel = (int)(floor(in_pixel_influence_upperbound - 0.5));
++}
++
++// What output pixels does this input pixel contribute to?
++static void stbir__calculate_sample_range_downsample(int n, float
in_pixels_radius, float scale_ratio, float out_shift, int* out_first_pixel,
int* out_last_pixel, float* out_center_of_in)
++{
++ float in_pixel_center = (float)n + 0.5f;
++ float in_pixel_influence_lowerbound = in_pixel_center - in_pixels_radius;
++ float in_pixel_influence_upperbound = in_pixel_center + in_pixels_radius;
++
++ float out_pixel_influence_lowerbound = in_pixel_influence_lowerbound *
scale_ratio - out_shift;
++ float out_pixel_influence_upperbound = in_pixel_influence_upperbound *
scale_ratio - out_shift;
++
++ *out_center_of_in = in_pixel_center * scale_ratio - out_shift;
++ *out_first_pixel = (int)(floor(out_pixel_influence_lowerbound + 0.5));
++ *out_last_pixel = (int)(floor(out_pixel_influence_upperbound - 0.5));
++}
++
++static void stbir__calculate_coefficients_upsample(stbir_filter filter, float
scale, int in_first_pixel, int in_last_pixel, float in_center_of_out,
stbir__contributors* contributor, float* coefficient_group)
++{
++ int i;
++ float total_filter = 0;
++ float filter_scale;
++
++ STBIR_ASSERT(in_last_pixel - in_first_pixel <=
(int)ceil(stbir__filter_info_table[filter].support(1/scale) * 2)); // Taken
directly from stbir__get_coefficient_width() which we can't call because we
don't know if we're horizontal or vertical.
++
++ contributor->n0 = in_first_pixel;
++ contributor->n1 = in_last_pixel;
++
++ STBIR_ASSERT(contributor->n1 >= contributor->n0);
++
++ for (i = 0; i <= in_last_pixel - in_first_pixel; i++)
++ {
++ float in_pixel_center = (float)(i + in_first_pixel) + 0.5f;
++ coefficient_group[i] =
stbir__filter_info_table[filter].kernel(in_center_of_out - in_pixel_center, 1 /
scale);
++
++ // If the coefficient is zero, skip it. (Don't do the <0 check here,
we want the influence of those outside pixels.)
++ if (i == 0 && !coefficient_group[i])
++ {
++ contributor->n0 = ++in_first_pixel;
++ i--;
++ continue;
++ }
++
++ total_filter += coefficient_group[i];
++ }
++
++
STBIR_ASSERT(stbir__filter_info_table[filter].kernel((float)(in_last_pixel + 1)
+ 0.5f - in_center_of_out, 1/scale) == 0);
++
++ STBIR_ASSERT(total_filter > 0.9);
++ STBIR_ASSERT(total_filter < 1.1f); // Make sure it's not way off.
++
++ // Make sure the sum of all coefficients is 1.
++ filter_scale = 1 / total_filter;
++
++ for (i = 0; i <= in_last_pixel - in_first_pixel; i++)
++ coefficient_group[i] *= filter_scale;
++
++ for (i = in_last_pixel - in_first_pixel; i >= 0; i--)
++ {
++ if (coefficient_group[i])
++ break;
++
++ // This line has no weight. We can skip it.
++ contributor->n1 = contributor->n0 + i - 1;
++ }
++}
++
++static void stbir__calculate_coefficients_downsample(stbir_filter filter,
float scale_ratio, int out_first_pixel, int out_last_pixel, float
out_center_of_in, stbir__contributors* contributor, float* coefficient_group)
++{
++ int i;
++
++ STBIR_ASSERT(out_last_pixel - out_first_pixel <=
(int)ceil(stbir__filter_info_table[filter].support(scale_ratio) * 2)); // Taken
directly from stbir__get_coefficient_width() which we can't call because we
don't know if we're horizontal or vertical.
++
++ contributor->n0 = out_first_pixel;
++ contributor->n1 = out_last_pixel;
++
++ STBIR_ASSERT(contributor->n1 >= contributor->n0);
++
++ for (i = 0; i <= out_last_pixel - out_first_pixel; i++)
++ {
++ float out_pixel_center = (float)(i + out_first_pixel) + 0.5f;
++ float x = out_pixel_center - out_center_of_in;
++ coefficient_group[i] = stbir__filter_info_table[filter].kernel(x,
scale_ratio) * scale_ratio;
++ }
++
++
STBIR_ASSERT(stbir__filter_info_table[filter].kernel((float)(out_last_pixel +
1) + 0.5f - out_center_of_in, scale_ratio) == 0);
++
++ for (i = out_last_pixel - out_first_pixel; i >= 0; i--)
++ {
++ if (coefficient_group[i])
++ break;
++
++ // This line has no weight. We can skip it.
++ contributor->n1 = contributor->n0 + i - 1;
++ }
++}
++
++static void stbir__normalize_downsample_coefficients(stbir__contributors*
contributors, float* coefficients, stbir_filter filter, float scale_ratio, int
input_size, int output_size)
++{
++ int num_contributors = stbir__get_contributors(scale_ratio, filter,
input_size, output_size);
++ int num_coefficients = stbir__get_coefficient_width(filter, scale_ratio);
++ int i, j;
++ int skip;
++
++ for (i = 0; i < output_size; i++)
++ {
++ float scale;
++ float total = 0;
++
++ for (j = 0; j < num_contributors; j++)
++ {
++ if (i >= contributors[j].n0 && i <= contributors[j].n1)
++ {
++ float coefficient = *stbir__get_coefficient(coefficients,
filter, scale_ratio, j, i - contributors[j].n0);
++ total += coefficient;
++ }
++ else if (i < contributors[j].n0)
++ break;
++ }
++
++ STBIR_ASSERT(total > 0.9f);
++ STBIR_ASSERT(total < 1.1f);
++
++ scale = 1 / total;
++
++ for (j = 0; j < num_contributors; j++)
++ {
++ if (i >= contributors[j].n0 && i <= contributors[j].n1)
++ *stbir__get_coefficient(coefficients, filter, scale_ratio, j,
i - contributors[j].n0) *= scale;
++ else if (i < contributors[j].n0)
++ break;
++ }
++ }
++
++ // Optimize: Skip zero coefficients and contributions outside of image
bounds.
++ // Do this after normalizing because normalization depends on the n0/n1
values.
++ for (j = 0; j < num_contributors; j++)
++ {
++ int range, max, width;
++
++ skip = 0;
++ while (*stbir__get_coefficient(coefficients, filter, scale_ratio, j,
skip) == 0)
++ skip++;
++
++ contributors[j].n0 += skip;
++
++ while (contributors[j].n0 < 0)
++ {
++ contributors[j].n0++;
++ skip++;
++ }
++
++ range = contributors[j].n1 - contributors[j].n0 + 1;
++ max = stbir__min(num_coefficients, range);
++
++ width = stbir__get_coefficient_width(filter, scale_ratio);
++ for (i = 0; i < max; i++)
++ {
++ if (i + skip >= width)
++ break;
++
++ *stbir__get_coefficient(coefficients, filter, scale_ratio, j, i)
= *stbir__get_coefficient(coefficients, filter, scale_ratio, j, i + skip);
++ }
++
++ continue;
++ }
++
++ // Using min to avoid writing into invalid pixels.
++ for (i = 0; i < num_contributors; i++)
++ contributors[i].n1 = stbir__min(contributors[i].n1, output_size - 1);
++}
++
++// Each scan line uses the same kernel values so we should calculate the
kernel
++// values once and then we can use them for every scan line.
++static void stbir__calculate_filters(stbir__contributors* contributors,
float* coefficients, stbir_filter filter, float scale_ratio, float shift, int
input_size, int output_size)
++{
++ int n;
++ int total_contributors = stbir__get_contributors(scale_ratio, filter,
input_size, output_size);
++
++ if (stbir__use_upsampling(scale_ratio))
++ {
++ float out_pixels_radius = stbir__filter_info_table[filter].support(1
/ scale_ratio) * scale_ratio;
++
++ // Looping through out pixels
++ for (n = 0; n < total_contributors; n++)
++ {
++ float in_center_of_out; // Center of the current out pixel in the
in pixel space
++ int in_first_pixel, in_last_pixel;
++
++ stbir__calculate_sample_range_upsample(n, out_pixels_radius,
scale_ratio, shift, &in_first_pixel, &in_last_pixel, &in_center_of_out);
++
++ stbir__calculate_coefficients_upsample(filter, scale_ratio,
in_first_pixel, in_last_pixel, in_center_of_out,
stbir__get_contributor(contributors, n), stbir__get_coefficient(coefficients,
filter, scale_ratio, n, 0));
++ }
++ }
++ else
++ {
++ float in_pixels_radius =
stbir__filter_info_table[filter].support(scale_ratio) / scale_ratio;
++
++ // Looping through in pixels
++ for (n = 0; n < total_contributors; n++)
++ {
++ float out_center_of_in; // Center of the current out pixel in the
in pixel space
++ int out_first_pixel, out_last_pixel;
++ int n_adjusted = n - stbir__get_filter_pixel_margin(filter,
scale_ratio);
++
++ stbir__calculate_sample_range_downsample(n_adjusted,
in_pixels_radius, scale_ratio, shift, &out_first_pixel, &out_last_pixel,
&out_center_of_in);
++
++ stbir__calculate_coefficients_downsample(filter, scale_ratio,
out_first_pixel, out_last_pixel, out_center_of_in,
stbir__get_contributor(contributors, n), stbir__get_coefficient(coefficients,
filter, scale_ratio, n, 0));
++ }
++
++ stbir__normalize_downsample_coefficients(contributors, coefficients,
filter, scale_ratio, input_size, output_size);
++ }
++}
++
++static float* stbir__get_decode_buffer(stbir__info* stbir_info)
++{
++ // The 0 index of the decode buffer starts after the margin. This makes
++ // it okay to use negative indexes on the decode buffer.
++ return
&stbir_info->decode_buffer[stbir_info->horizontal_filter_pixel_margin *
stbir_info->channels];
++}
++
++#define STBIR__DECODE(type, colorspace) ((int)(type) *
(STBIR_MAX_COLORSPACES) + (int)(colorspace))
++
++static void stbir__decode_scanline(stbir__info* stbir_info, int n)
++{
++ int c;
++ int channels = stbir_info->channels;
++ int alpha_channel = stbir_info->alpha_channel;
++ int type = stbir_info->type;
++ int colorspace = stbir_info->colorspace;
++ int input_w = stbir_info->input_w;
++ size_t input_stride_bytes = stbir_info->input_stride_bytes;
++ float* decode_buffer = stbir__get_decode_buffer(stbir_info);
++ stbir_edge edge_horizontal = stbir_info->edge_horizontal;
++ stbir_edge edge_vertical = stbir_info->edge_vertical;
++ size_t in_buffer_row_offset = stbir__edge_wrap(edge_vertical, n,
stbir_info->input_h) * input_stride_bytes;
++ const void* input_data = (char *) stbir_info->input_data +
in_buffer_row_offset;
++ int max_x = input_w + stbir_info->horizontal_filter_pixel_margin;
++ int decode = STBIR__DECODE(type, colorspace);
++
++ int x = -stbir_info->horizontal_filter_pixel_margin;
++
++ // special handling for STBIR_EDGE_ZERO because it needs to return an
item that doesn't appear in the input,
++ // and we want to avoid paying overhead on every pixel if not
STBIR_EDGE_ZERO
++ if (edge_vertical == STBIR_EDGE_ZERO && (n < 0 || n >=
stbir_info->input_h))
++ {
++ for (; x < max_x; x++)
++ for (c = 0; c < channels; c++)
++ decode_buffer[x*channels + c] = 0;
++ return;
++ }
++
++ switch (decode)
++ {
++ case STBIR__DECODE(STBIR_TYPE_UINT8, STBIR_COLORSPACE_LINEAR):
++ for (; x < max_x; x++)
++ {
++ int decode_pixel_index = x * channels;
++ int input_pixel_index = stbir__edge_wrap(edge_horizontal, x,
input_w) * channels;
++ for (c = 0; c < channels; c++)
++ decode_buffer[decode_pixel_index + c] = ((float)((const
unsigned char*)input_data)[input_pixel_index + c]) / stbir__max_uint8_as_float;
++ }
++ break;
++
++ case STBIR__DECODE(STBIR_TYPE_UINT8, STBIR_COLORSPACE_SRGB):
++ for (; x < max_x; x++)
++ {
++ int decode_pixel_index = x * channels;
++ int input_pixel_index = stbir__edge_wrap(edge_horizontal, x,
input_w) * channels;
++ for (c = 0; c < channels; c++)
++ decode_buffer[decode_pixel_index + c] =
stbir__srgb_uchar_to_linear_float[((const unsigned
char*)input_data)[input_pixel_index + c]];
++
++ if (!(stbir_info->flags&STBIR_FLAG_ALPHA_USES_COLORSPACE))
++ decode_buffer[decode_pixel_index + alpha_channel] =
((float)((const unsigned char*)input_data)[input_pixel_index + alpha_channel])
/ stbir__max_uint8_as_float;
++ }
++ break;
++
++ case STBIR__DECODE(STBIR_TYPE_UINT16, STBIR_COLORSPACE_LINEAR):
++ for (; x < max_x; x++)
++ {
++ int decode_pixel_index = x * channels;
++ int input_pixel_index = stbir__edge_wrap(edge_horizontal, x,
input_w) * channels;
++ for (c = 0; c < channels; c++)
++ decode_buffer[decode_pixel_index + c] = ((float)((const
unsigned short*)input_data)[input_pixel_index + c]) /
stbir__max_uint16_as_float;
++ }
++ break;
++
++ case STBIR__DECODE(STBIR_TYPE_UINT16, STBIR_COLORSPACE_SRGB):
++ for (; x < max_x; x++)
++ {
++ int decode_pixel_index = x * channels;
++ int input_pixel_index = stbir__edge_wrap(edge_horizontal, x,
input_w) * channels;
++ for (c = 0; c < channels; c++)
++ decode_buffer[decode_pixel_index + c] =
stbir__srgb_to_linear(((float)((const unsigned
short*)input_data)[input_pixel_index + c]) / stbir__max_uint16_as_float);
++
++ if (!(stbir_info->flags&STBIR_FLAG_ALPHA_USES_COLORSPACE))
++ decode_buffer[decode_pixel_index + alpha_channel] =
((float)((const unsigned short*)input_data)[input_pixel_index + alpha_channel])
/ stbir__max_uint16_as_float;
++ }
++ break;
++
++ case STBIR__DECODE(STBIR_TYPE_UINT32, STBIR_COLORSPACE_LINEAR):
++ for (; x < max_x; x++)
++ {
++ int decode_pixel_index = x * channels;
++ int input_pixel_index = stbir__edge_wrap(edge_horizontal, x,
input_w) * channels;
++ for (c = 0; c < channels; c++)
++ decode_buffer[decode_pixel_index + c] =
(float)(((double)((const unsigned int*)input_data)[input_pixel_index + c]) /
stbir__max_uint32_as_float);
++ }
++ break;
++
++ case STBIR__DECODE(STBIR_TYPE_UINT32, STBIR_COLORSPACE_SRGB):
++ for (; x < max_x; x++)
++ {
++ int decode_pixel_index = x * channels;
++ int input_pixel_index = stbir__edge_wrap(edge_horizontal, x,
input_w) * channels;
++ for (c = 0; c < channels; c++)
++ decode_buffer[decode_pixel_index + c] =
stbir__srgb_to_linear((float)(((double)((const unsigned
int*)input_data)[input_pixel_index + c]) / stbir__max_uint32_as_float));
++
++ if (!(stbir_info->flags&STBIR_FLAG_ALPHA_USES_COLORSPACE))
++ decode_buffer[decode_pixel_index + alpha_channel] =
(float)(((double)((const unsigned int*)input_data)[input_pixel_index +
alpha_channel]) / stbir__max_uint32_as_float);
++ }
++ break;
++
++ case STBIR__DECODE(STBIR_TYPE_FLOAT, STBIR_COLORSPACE_LINEAR):
++ for (; x < max_x; x++)
++ {
++ int decode_pixel_index = x * channels;
++ int input_pixel_index = stbir__edge_wrap(edge_horizontal, x,
input_w) * channels;
++ for (c = 0; c < channels; c++)
++ decode_buffer[decode_pixel_index + c] = ((const
float*)input_data)[input_pixel_index + c];
++ }
++ break;
++
++ case STBIR__DECODE(STBIR_TYPE_FLOAT, STBIR_COLORSPACE_SRGB):
++ for (; x < max_x; x++)
++ {
++ int decode_pixel_index = x * channels;
++ int input_pixel_index = stbir__edge_wrap(edge_horizontal, x,
input_w) * channels;
++ for (c = 0; c < channels; c++)
++ decode_buffer[decode_pixel_index + c] =
stbir__srgb_to_linear(((const float*)input_data)[input_pixel_index + c]);
++
++ if (!(stbir_info->flags&STBIR_FLAG_ALPHA_USES_COLORSPACE))
++ decode_buffer[decode_pixel_index + alpha_channel] = ((const
float*)input_data)[input_pixel_index + alpha_channel];
++ }
++
++ break;
++
++ default:
++ STBIR_ASSERT(!"Unknown type/colorspace/channels combination.");
++ break;
++ }
++
++ if (!(stbir_info->flags & STBIR_FLAG_ALPHA_PREMULTIPLIED))
++ {
++ for (x = -stbir_info->horizontal_filter_pixel_margin; x < max_x; x++)
++ {
++ int decode_pixel_index = x * channels;
++
++ // If the alpha value is 0 it will clobber the color values. Make
sure it's not.
++ float alpha = decode_buffer[decode_pixel_index + alpha_channel];
++#ifndef STBIR_NO_ALPHA_EPSILON
++ if (stbir_info->type != STBIR_TYPE_FLOAT) {
++ alpha += STBIR_ALPHA_EPSILON;
++ decode_buffer[decode_pixel_index + alpha_channel] = alpha;
++ }
++#endif
++ for (c = 0; c < channels; c++)
++ {
++ if (c == alpha_channel)
++ continue;
++
++ decode_buffer[decode_pixel_index + c] *= alpha;
++ }
++ }
++ }
++
++ if (edge_horizontal == STBIR_EDGE_ZERO)
++ {
++ for (x = -stbir_info->horizontal_filter_pixel_margin; x < 0; x++)
++ {
++ for (c = 0; c < channels; c++)
++ decode_buffer[x*channels + c] = 0;
++ }
++ for (x = input_w; x < max_x; x++)
++ {
++ for (c = 0; c < channels; c++)
++ decode_buffer[x*channels + c] = 0;
++ }
++ }
++}
++
++static float* stbir__get_ring_buffer_entry(float* ring_buffer, int index, int
ring_buffer_length)
++{
++ return &ring_buffer[index * ring_buffer_length];
++}
++
++static float* stbir__add_empty_ring_buffer_entry(stbir__info* stbir_info, int
n)
++{
++ int ring_buffer_index;
++ float* ring_buffer;
++
++ stbir_info->ring_buffer_last_scanline = n;
++
++ if (stbir_info->ring_buffer_begin_index < 0)
++ {
++ ring_buffer_index = stbir_info->ring_buffer_begin_index = 0;
++ stbir_info->ring_buffer_first_scanline = n;
++ }
++ else
++ {
++ ring_buffer_index = (stbir_info->ring_buffer_begin_index +
(stbir_info->ring_buffer_last_scanline -
stbir_info->ring_buffer_first_scanline)) % stbir_info->ring_buffer_num_entries;
++ STBIR_ASSERT(ring_buffer_index !=
stbir_info->ring_buffer_begin_index);
++ }
++
++ ring_buffer = stbir__get_ring_buffer_entry(stbir_info->ring_buffer,
ring_buffer_index, stbir_info->ring_buffer_length_bytes / sizeof(float));
++ memset(ring_buffer, 0, stbir_info->ring_buffer_length_bytes);
++
++ return ring_buffer;
++}
++
++
++static void stbir__resample_horizontal_upsample(stbir__info* stbir_info,
float* output_buffer)
++{
++ int x, k;
++ int output_w = stbir_info->output_w;
++ int channels = stbir_info->channels;
++ float* decode_buffer = stbir__get_decode_buffer(stbir_info);
++ stbir__contributors* horizontal_contributors =
stbir_info->horizontal_contributors;
++ float* horizontal_coefficients = stbir_info->horizontal_coefficients;
++ int coefficient_width = stbir_info->horizontal_coefficient_width;
++
++ for (x = 0; x < output_w; x++)
++ {
++ int n0 = horizontal_contributors[x].n0;
++ int n1 = horizontal_contributors[x].n1;
++
++ int out_pixel_index = x * channels;
++ int coefficient_group = coefficient_width * x;
++ int coefficient_counter = 0;
++
++ STBIR_ASSERT(n1 >= n0);
++ STBIR_ASSERT(n0 >= -stbir_info->horizontal_filter_pixel_margin);
++ STBIR_ASSERT(n1 >= -stbir_info->horizontal_filter_pixel_margin);
++ STBIR_ASSERT(n0 < stbir_info->input_w +
stbir_info->horizontal_filter_pixel_margin);
++ STBIR_ASSERT(n1 < stbir_info->input_w +
stbir_info->horizontal_filter_pixel_margin);
++
++ switch (channels) {
++ case 1:
++ for (k = n0; k <= n1; k++)
++ {
++ int in_pixel_index = k * 1;
++ float coefficient =
horizontal_coefficients[coefficient_group + coefficient_counter++];
++ STBIR_ASSERT(coefficient != 0);
++ output_buffer[out_pixel_index + 0] +=
decode_buffer[in_pixel_index + 0] * coefficient;
++ }
++ break;
++ case 2:
++ for (k = n0; k <= n1; k++)
++ {
++ int in_pixel_index = k * 2;
++ float coefficient =
horizontal_coefficients[coefficient_group + coefficient_counter++];
++ STBIR_ASSERT(coefficient != 0);
++ output_buffer[out_pixel_index + 0] +=
decode_buffer[in_pixel_index + 0] * coefficient;
++ output_buffer[out_pixel_index + 1] +=
decode_buffer[in_pixel_index + 1] * coefficient;
++ }
++ break;
++ case 3:
++ for (k = n0; k <= n1; k++)
++ {
++ int in_pixel_index = k * 3;
++ float coefficient =
horizontal_coefficients[coefficient_group + coefficient_counter++];
++ STBIR_ASSERT(coefficient != 0);
++ output_buffer[out_pixel_index + 0] +=
decode_buffer[in_pixel_index + 0] * coefficient;
++ output_buffer[out_pixel_index + 1] +=
decode_buffer[in_pixel_index + 1] * coefficient;
++ output_buffer[out_pixel_index + 2] +=
decode_buffer[in_pixel_index + 2] * coefficient;
++ }
++ break;
++ case 4:
++ for (k = n0; k <= n1; k++)
++ {
++ int in_pixel_index = k * 4;
++ float coefficient =
horizontal_coefficients[coefficient_group + coefficient_counter++];
++ STBIR_ASSERT(coefficient != 0);
++ output_buffer[out_pixel_index + 0] +=
decode_buffer[in_pixel_index + 0] * coefficient;
++ output_buffer[out_pixel_index + 1] +=
decode_buffer[in_pixel_index + 1] * coefficient;
++ output_buffer[out_pixel_index + 2] +=
decode_buffer[in_pixel_index + 2] * coefficient;
++ output_buffer[out_pixel_index + 3] +=
decode_buffer[in_pixel_index + 3] * coefficient;
++ }
++ break;
++ default:
++ for (k = n0; k <= n1; k++)
++ {
++ int in_pixel_index = k * channels;
++ float coefficient =
horizontal_coefficients[coefficient_group + coefficient_counter++];
++ int c;
++ STBIR_ASSERT(coefficient != 0);
++ for (c = 0; c < channels; c++)
++ output_buffer[out_pixel_index + c] +=
decode_buffer[in_pixel_index + c] * coefficient;
++ }
++ break;
++ }
++ }
++}
++
++static void stbir__resample_horizontal_downsample(stbir__info* stbir_info,
float* output_buffer)
++{
++ int x, k;
++ int input_w = stbir_info->input_w;
++ int channels = stbir_info->channels;
++ float* decode_buffer = stbir__get_decode_buffer(stbir_info);
++ stbir__contributors* horizontal_contributors =
stbir_info->horizontal_contributors;
++ float* horizontal_coefficients = stbir_info->horizontal_coefficients;
++ int coefficient_width = stbir_info->horizontal_coefficient_width;
++ int filter_pixel_margin = stbir_info->horizontal_filter_pixel_margin;
++ int max_x = input_w + filter_pixel_margin * 2;
++
++ STBIR_ASSERT(!stbir__use_width_upsampling(stbir_info));
++
++ switch (channels) {
++ case 1:
++ for (x = 0; x < max_x; x++)
++ {
++ int n0 = horizontal_contributors[x].n0;
++ int n1 = horizontal_contributors[x].n1;
++
++ int in_x = x - filter_pixel_margin;
++ int in_pixel_index = in_x * 1;
++ int max_n = n1;
++ int coefficient_group = coefficient_width * x;
++
++ for (k = n0; k <= max_n; k++)
++ {
++ int out_pixel_index = k * 1;
++ float coefficient =
horizontal_coefficients[coefficient_group + k - n0];
++ STBIR_ASSERT(coefficient != 0);
++ output_buffer[out_pixel_index + 0] +=
decode_buffer[in_pixel_index + 0] * coefficient;
++ }
++ }
++ break;
++
++ case 2:
++ for (x = 0; x < max_x; x++)
++ {
++ int n0 = horizontal_contributors[x].n0;
++ int n1 = horizontal_contributors[x].n1;
++
++ int in_x = x - filter_pixel_margin;
++ int in_pixel_index = in_x * 2;
++ int max_n = n1;
++ int coefficient_group = coefficient_width * x;
++
++ for (k = n0; k <= max_n; k++)
++ {
++ int out_pixel_index = k * 2;
++ float coefficient =
horizontal_coefficients[coefficient_group + k - n0];
++ STBIR_ASSERT(coefficient != 0);
++ output_buffer[out_pixel_index + 0] +=
decode_buffer[in_pixel_index + 0] * coefficient;
++ output_buffer[out_pixel_index + 1] +=
decode_buffer[in_pixel_index + 1] * coefficient;
++ }
++ }
++ break;
++
++ case 3:
++ for (x = 0; x < max_x; x++)
++ {
++ int n0 = horizontal_contributors[x].n0;
++ int n1 = horizontal_contributors[x].n1;
++
++ int in_x = x - filter_pixel_margin;
++ int in_pixel_index = in_x * 3;
++ int max_n = n1;
++ int coefficient_group = coefficient_width * x;
++
++ for (k = n0; k <= max_n; k++)
++ {
++ int out_pixel_index = k * 3;
++ float coefficient =
horizontal_coefficients[coefficient_group + k - n0];
++ STBIR_ASSERT(coefficient != 0);
++ output_buffer[out_pixel_index + 0] +=
decode_buffer[in_pixel_index + 0] * coefficient;
++ output_buffer[out_pixel_index + 1] +=
decode_buffer[in_pixel_index + 1] * coefficient;
++ output_buffer[out_pixel_index + 2] +=
decode_buffer[in_pixel_index + 2] * coefficient;
++ }
++ }
++ break;
++
++ case 4:
++ for (x = 0; x < max_x; x++)
++ {
++ int n0 = horizontal_contributors[x].n0;
++ int n1 = horizontal_contributors[x].n1;
++
++ int in_x = x - filter_pixel_margin;
++ int in_pixel_index = in_x * 4;
++ int max_n = n1;
++ int coefficient_group = coefficient_width * x;
++
++ for (k = n0; k <= max_n; k++)
++ {
++ int out_pixel_index = k * 4;
++ float coefficient =
horizontal_coefficients[coefficient_group + k - n0];
++ STBIR_ASSERT(coefficient != 0);
++ output_buffer[out_pixel_index + 0] +=
decode_buffer[in_pixel_index + 0] * coefficient;
++ output_buffer[out_pixel_index + 1] +=
decode_buffer[in_pixel_index + 1] * coefficient;
++ output_buffer[out_pixel_index + 2] +=
decode_buffer[in_pixel_index + 2] * coefficient;
++ output_buffer[out_pixel_index + 3] +=
decode_buffer[in_pixel_index + 3] * coefficient;
++ }
++ }
++ break;
++
++ default:
++ for (x = 0; x < max_x; x++)
++ {
++ int n0 = horizontal_contributors[x].n0;
++ int n1 = horizontal_contributors[x].n1;
++
++ int in_x = x - filter_pixel_margin;
++ int in_pixel_index = in_x * channels;
++ int max_n = n1;
++ int coefficient_group = coefficient_width * x;
++
++ for (k = n0; k <= max_n; k++)
++ {
++ int c;
++ int out_pixel_index = k * channels;
++ float coefficient =
horizontal_coefficients[coefficient_group + k - n0];
++ STBIR_ASSERT(coefficient != 0);
++ for (c = 0; c < channels; c++)
++ output_buffer[out_pixel_index + c] +=
decode_buffer[in_pixel_index + c] * coefficient;
++ }
++ }
++ break;
++ }
++}
++
++static void stbir__decode_and_resample_upsample(stbir__info* stbir_info, int
n)
++{
++ // Decode the nth scanline from the source image into the decode buffer.
++ stbir__decode_scanline(stbir_info, n);
++
++ // Now resample it into the ring buffer.
++ if (stbir__use_width_upsampling(stbir_info))
++ stbir__resample_horizontal_upsample(stbir_info,
stbir__add_empty_ring_buffer_entry(stbir_info, n));
++ else
++ stbir__resample_horizontal_downsample(stbir_info,
stbir__add_empty_ring_buffer_entry(stbir_info, n));
++
++ // Now it's sitting in the ring buffer ready to be used as source for the
vertical sampling.
++}
++
++static void stbir__decode_and_resample_downsample(stbir__info* stbir_info,
int n)
++{
++ // Decode the nth scanline from the source image into the decode buffer.
++ stbir__decode_scanline(stbir_info, n);
++
++ memset(stbir_info->horizontal_buffer, 0, stbir_info->output_w *
stbir_info->channels * sizeof(float));
++
++ // Now resample it into the horizontal buffer.
++ if (stbir__use_width_upsampling(stbir_info))
++ stbir__resample_horizontal_upsample(stbir_info,
stbir_info->horizontal_buffer);
++ else
++ stbir__resample_horizontal_downsample(stbir_info,
stbir_info->horizontal_buffer);
++
++ // Now it's sitting in the horizontal buffer ready to be distributed into
the ring buffers.
++}
++
++// Get the specified scan line from the ring buffer.
++static float* stbir__get_ring_buffer_scanline(int get_scanline, float*
ring_buffer, int begin_index, int first_scanline, int ring_buffer_num_entries,
int ring_buffer_length)
++{
++ int ring_buffer_index = (begin_index + (get_scanline - first_scanline)) %
ring_buffer_num_entries;
++ return stbir__get_ring_buffer_entry(ring_buffer, ring_buffer_index,
ring_buffer_length);
++}
++
++
++static void stbir__encode_scanline(stbir__info* stbir_info, int num_pixels,
void *output_buffer, float *encode_buffer, int channels, int alpha_channel, int
decode)
++{
++ int x;
++ int n;
++ int num_nonalpha;
++ stbir_uint16 nonalpha[STBIR_MAX_CHANNELS];
++
++ if (!(stbir_info->flags&STBIR_FLAG_ALPHA_PREMULTIPLIED))
++ {
++ for (x=0; x < num_pixels; ++x)
++ {
++ int pixel_index = x*channels;
++
++ float alpha = encode_buffer[pixel_index + alpha_channel];
++ float reciprocal_alpha = alpha ? 1.0f / alpha : 0;
++
++ // unrolling this produced a 1% slowdown upscaling a large RGBA
linear-space image on my machine - stb
++ for (n = 0; n < channels; n++)
++ if (n != alpha_channel)
++ encode_buffer[pixel_index + n] *= reciprocal_alpha;
++
++ // We added in a small epsilon to prevent the color channel from
being deleted with zero alpha.
++ // Because we only add it for integer types, it will
automatically be discarded on integer
++ // conversion, so we don't need to subtract it back out (which
would be problematic for
++ // numeric precision reasons).
++ }
++ }
++
++ // build a table of all channels that need colorspace correction, so
++ // we don't perform colorspace correction on channels that don't need it.
++ for (x = 0, num_nonalpha = 0; x < channels; ++x)
++ {
++ if (x != alpha_channel || (stbir_info->flags &
STBIR_FLAG_ALPHA_USES_COLORSPACE))
++ {
++ nonalpha[num_nonalpha++] = (stbir_uint16)x;
++ }
++ }
++
++ #define STBIR__ROUND_INT(f) ((int) ((f)+0.5))
++ #define STBIR__ROUND_UINT(f) ((stbir_uint32) ((f)+0.5))
++
++ #ifdef STBIR__SATURATE_INT
++ #define STBIR__ENCODE_LINEAR8(f) stbir__saturate8 (STBIR__ROUND_INT((f)
* stbir__max_uint8_as_float ))
++ #define STBIR__ENCODE_LINEAR16(f) stbir__saturate16(STBIR__ROUND_INT((f)
* stbir__max_uint16_as_float))
++ #else
++ #define STBIR__ENCODE_LINEAR8(f) (unsigned char )
STBIR__ROUND_INT(stbir__saturate(f) * stbir__max_uint8_as_float )
++ #define STBIR__ENCODE_LINEAR16(f) (unsigned short)
STBIR__ROUND_INT(stbir__saturate(f) * stbir__max_uint16_as_float)
++ #endif
++
++ switch (decode)
++ {
++ case STBIR__DECODE(STBIR_TYPE_UINT8, STBIR_COLORSPACE_LINEAR):
++ for (x=0; x < num_pixels; ++x)
++ {
++ int pixel_index = x*channels;
++
++ for (n = 0; n < channels; n++)
++ {
++ int index = pixel_index + n;
++ ((unsigned char*)output_buffer)[index] =
STBIR__ENCODE_LINEAR8(encode_buffer[index]);
++ }
++ }
++ break;
++
++ case STBIR__DECODE(STBIR_TYPE_UINT8, STBIR_COLORSPACE_SRGB):
++ for (x=0; x < num_pixels; ++x)
++ {
++ int pixel_index = x*channels;
++
++ for (n = 0; n < num_nonalpha; n++)
++ {
++ int index = pixel_index + nonalpha[n];
++ ((unsigned char*)output_buffer)[index] =
stbir__linear_to_srgb_uchar(encode_buffer[index]);
++ }
++
++ if (!(stbir_info->flags & STBIR_FLAG_ALPHA_USES_COLORSPACE))
++ ((unsigned char *)output_buffer)[pixel_index +
alpha_channel] =
STBIR__ENCODE_LINEAR8(encode_buffer[pixel_index+alpha_channel]);
++ }
++ break;
++
++ case STBIR__DECODE(STBIR_TYPE_UINT16, STBIR_COLORSPACE_LINEAR):
++ for (x=0; x < num_pixels; ++x)
++ {
++ int pixel_index = x*channels;
++
++ for (n = 0; n < channels; n++)
++ {
++ int index = pixel_index + n;
++ ((unsigned short*)output_buffer)[index] =
STBIR__ENCODE_LINEAR16(encode_buffer[index]);
++ }
++ }
++ break;
++
++ case STBIR__DECODE(STBIR_TYPE_UINT16, STBIR_COLORSPACE_SRGB):
++ for (x=0; x < num_pixels; ++x)
++ {
++ int pixel_index = x*channels;
++
++ for (n = 0; n < num_nonalpha; n++)
++ {
++ int index = pixel_index + nonalpha[n];
++ ((unsigned short*)output_buffer)[index] = (unsigned
short)STBIR__ROUND_INT(stbir__linear_to_srgb(stbir__saturate(encode_buffer[index]))
* stbir__max_uint16_as_float);
++ }
++
++ if (!(stbir_info->flags&STBIR_FLAG_ALPHA_USES_COLORSPACE))
++ ((unsigned short*)output_buffer)[pixel_index +
alpha_channel] = STBIR__ENCODE_LINEAR16(encode_buffer[pixel_index +
alpha_channel]);
++ }
++
++ break;
++
++ case STBIR__DECODE(STBIR_TYPE_UINT32, STBIR_COLORSPACE_LINEAR):
++ for (x=0; x < num_pixels; ++x)
++ {
++ int pixel_index = x*channels;
++
++ for (n = 0; n < channels; n++)
++ {
++ int index = pixel_index + n;
++ ((unsigned int*)output_buffer)[index] = (unsigned
int)STBIR__ROUND_UINT(((double)stbir__saturate(encode_buffer[index])) *
stbir__max_uint32_as_float);
++ }
++ }
++ break;
++
++ case STBIR__DECODE(STBIR_TYPE_UINT32, STBIR_COLORSPACE_SRGB):
++ for (x=0; x < num_pixels; ++x)
++ {
++ int pixel_index = x*channels;
++
++ for (n = 0; n < num_nonalpha; n++)
++ {
++ int index = pixel_index + nonalpha[n];
++ ((unsigned int*)output_buffer)[index] = (unsigned
int)STBIR__ROUND_UINT(((double)stbir__linear_to_srgb(stbir__saturate(encode_buffer[index])))
* stbir__max_uint32_as_float);
++ }
++
++ if (!(stbir_info->flags&STBIR_FLAG_ALPHA_USES_COLORSPACE))
++ ((unsigned int*)output_buffer)[pixel_index +
alpha_channel] = (unsigned
int)STBIR__ROUND_INT(((double)stbir__saturate(encode_buffer[pixel_index +
alpha_channel])) * stbir__max_uint32_as_float);
++ }
++ break;
++
++ case STBIR__DECODE(STBIR_TYPE_FLOAT, STBIR_COLORSPACE_LINEAR):
++ for (x=0; x < num_pixels; ++x)
++ {
++ int pixel_index = x*channels;
++
++ for (n = 0; n < channels; n++)
++ {
++ int index = pixel_index + n;
++ ((float*)output_buffer)[index] = encode_buffer[index];
++ }
++ }
++ break;
++
++ case STBIR__DECODE(STBIR_TYPE_FLOAT, STBIR_COLORSPACE_SRGB):
++ for (x=0; x < num_pixels; ++x)
++ {
++ int pixel_index = x*channels;
++
++ for (n = 0; n < num_nonalpha; n++)
++ {
++ int index = pixel_index + nonalpha[n];
++ ((float*)output_buffer)[index] =
stbir__linear_to_srgb(encode_buffer[index]);
++ }
++
++ if (!(stbir_info->flags&STBIR_FLAG_ALPHA_USES_COLORSPACE))
++ ((float*)output_buffer)[pixel_index + alpha_channel] =
encode_buffer[pixel_index + alpha_channel];
++ }
++ break;
++
++ default:
++ STBIR_ASSERT(!"Unknown type/colorspace/channels combination.");
++ break;
++ }
++}
++
++static void stbir__resample_vertical_upsample(stbir__info* stbir_info, int n)
++{
++ int x, k;
++ int output_w = stbir_info->output_w;
++ stbir__contributors* vertical_contributors =
stbir_info->vertical_contributors;
++ float* vertical_coefficients = stbir_info->vertical_coefficients;
++ int channels = stbir_info->channels;
++ int alpha_channel = stbir_info->alpha_channel;
++ int type = stbir_info->type;
++ int colorspace = stbir_info->colorspace;
++ int ring_buffer_entries = stbir_info->ring_buffer_num_entries;
++ void* output_data = stbir_info->output_data;
++ float* encode_buffer = stbir_info->encode_buffer;
++ int decode = STBIR__DECODE(type, colorspace);
++ int coefficient_width = stbir_info->vertical_coefficient_width;
++ int coefficient_counter;
++ int contributor = n;
++
++ float* ring_buffer = stbir_info->ring_buffer;
++ int ring_buffer_begin_index = stbir_info->ring_buffer_begin_index;
++ int ring_buffer_first_scanline = stbir_info->ring_buffer_first_scanline;
++ int ring_buffer_length =
stbir_info->ring_buffer_length_bytes/sizeof(float);
++
++ int n0,n1, output_row_start;
++ int coefficient_group = coefficient_width * contributor;
++
++ n0 = vertical_contributors[contributor].n0;
++ n1 = vertical_contributors[contributor].n1;
++
++ output_row_start = n * stbir_info->output_stride_bytes;
++
++ STBIR_ASSERT(stbir__use_height_upsampling(stbir_info));
++
++ memset(encode_buffer, 0, output_w * sizeof(float) * channels);
++
++ // I tried reblocking this for better cache usage of encode_buffer
++ // (using x_outer, k, x_inner), but it lost speed. -- stb
++
++ coefficient_counter = 0;
++ switch (channels) {
++ case 1:
++ for (k = n0; k <= n1; k++)
++ {
++ int coefficient_index = coefficient_counter++;
++ float* ring_buffer_entry = stbir__get_ring_buffer_scanline(k,
ring_buffer, ring_buffer_begin_index, ring_buffer_first_scanline,
ring_buffer_entries, ring_buffer_length);
++ float coefficient = vertical_coefficients[coefficient_group +
coefficient_index];
++ for (x = 0; x < output_w; ++x)
++ {
++ int in_pixel_index = x * 1;
++ encode_buffer[in_pixel_index + 0] +=
ring_buffer_entry[in_pixel_index + 0] * coefficient;
++ }
++ }
++ break;
++ case 2:
++ for (k = n0; k <= n1; k++)
++ {
++ int coefficient_index = coefficient_counter++;
++ float* ring_buffer_entry = stbir__get_ring_buffer_scanline(k,
ring_buffer, ring_buffer_begin_index, ring_buffer_first_scanline,
ring_buffer_entries, ring_buffer_length);
++ float coefficient = vertical_coefficients[coefficient_group +
coefficient_index];
++ for (x = 0; x < output_w; ++x)
++ {
++ int in_pixel_index = x * 2;
++ encode_buffer[in_pixel_index + 0] +=
ring_buffer_entry[in_pixel_index + 0] * coefficient;
++ encode_buffer[in_pixel_index + 1] +=
ring_buffer_entry[in_pixel_index + 1] * coefficient;
++ }
++ }
++ break;
++ case 3:
++ for (k = n0; k <= n1; k++)
++ {
++ int coefficient_index = coefficient_counter++;
++ float* ring_buffer_entry = stbir__get_ring_buffer_scanline(k,
ring_buffer, ring_buffer_begin_index, ring_buffer_first_scanline,
ring_buffer_entries, ring_buffer_length);
++ float coefficient = vertical_coefficients[coefficient_group +
coefficient_index];
++ for (x = 0; x < output_w; ++x)
++ {
++ int in_pixel_index = x * 3;
++ encode_buffer[in_pixel_index + 0] +=
ring_buffer_entry[in_pixel_index + 0] * coefficient;
++ encode_buffer[in_pixel_index + 1] +=
ring_buffer_entry[in_pixel_index + 1] * coefficient;
++ encode_buffer[in_pixel_index + 2] +=
ring_buffer_entry[in_pixel_index + 2] * coefficient;
++ }
++ }
++ break;
++ case 4:
++ for (k = n0; k <= n1; k++)
++ {
++ int coefficient_index = coefficient_counter++;
++ float* ring_buffer_entry = stbir__get_ring_buffer_scanline(k,
ring_buffer, ring_buffer_begin_index, ring_buffer_first_scanline,
ring_buffer_entries, ring_buffer_length);
++ float coefficient = vertical_coefficients[coefficient_group +
coefficient_index];
++ for (x = 0; x < output_w; ++x)
++ {
++ int in_pixel_index = x * 4;
++ encode_buffer[in_pixel_index + 0] +=
ring_buffer_entry[in_pixel_index + 0] * coefficient;
++ encode_buffer[in_pixel_index + 1] +=
ring_buffer_entry[in_pixel_index + 1] * coefficient;
++ encode_buffer[in_pixel_index + 2] +=
ring_buffer_entry[in_pixel_index + 2] * coefficient;
++ encode_buffer[in_pixel_index + 3] +=
ring_buffer_entry[in_pixel_index + 3] * coefficient;
++ }
++ }
++ break;
++ default:
++ for (k = n0; k <= n1; k++)
++ {
++ int coefficient_index = coefficient_counter++;
++ float* ring_buffer_entry = stbir__get_ring_buffer_scanline(k,
ring_buffer, ring_buffer_begin_index, ring_buffer_first_scanline,
ring_buffer_entries, ring_buffer_length);
++ float coefficient = vertical_coefficients[coefficient_group +
coefficient_index];
++ for (x = 0; x < output_w; ++x)
++ {
++ int in_pixel_index = x * channels;
++ int c;
++ for (c = 0; c < channels; c++)
++ encode_buffer[in_pixel_index + c] +=
ring_buffer_entry[in_pixel_index + c] * coefficient;
++ }
++ }
++ break;
++ }
++ stbir__encode_scanline(stbir_info, output_w, (char *) output_data +
output_row_start, encode_buffer, channels, alpha_channel, decode);
++}
++
++static void stbir__resample_vertical_downsample(stbir__info* stbir_info, int
n)
++{
++ int x, k;
++ int output_w = stbir_info->output_w;
++ stbir__contributors* vertical_contributors =
stbir_info->vertical_contributors;
++ float* vertical_coefficients = stbir_info->vertical_coefficients;
++ int channels = stbir_info->channels;
++ int ring_buffer_entries = stbir_info->ring_buffer_num_entries;
++ float* horizontal_buffer = stbir_info->horizontal_buffer;
++ int coefficient_width = stbir_info->vertical_coefficient_width;
++ int contributor = n + stbir_info->vertical_filter_pixel_margin;
++
++ float* ring_buffer = stbir_info->ring_buffer;
++ int ring_buffer_begin_index = stbir_info->ring_buffer_begin_index;
++ int ring_buffer_first_scanline = stbir_info->ring_buffer_first_scanline;
++ int ring_buffer_length =
stbir_info->ring_buffer_length_bytes/sizeof(float);
++ int n0,n1;
++
++ n0 = vertical_contributors[contributor].n0;
++ n1 = vertical_contributors[contributor].n1;
++
++ STBIR_ASSERT(!stbir__use_height_upsampling(stbir_info));
++
++ for (k = n0; k <= n1; k++)
++ {
++ int coefficient_index = k - n0;
++ int coefficient_group = coefficient_width * contributor;
++ float coefficient = vertical_coefficients[coefficient_group +
coefficient_index];
++
++ float* ring_buffer_entry = stbir__get_ring_buffer_scanline(k,
ring_buffer, ring_buffer_begin_index, ring_buffer_first_scanline,
ring_buffer_entries, ring_buffer_length);
++
++ switch (channels) {
++ case 1:
++ for (x = 0; x < output_w; x++)
++ {
++ int in_pixel_index = x * 1;
++ ring_buffer_entry[in_pixel_index + 0] +=
horizontal_buffer[in_pixel_index + 0] * coefficient;
++ }
++ break;
++ case 2:
++ for (x = 0; x < output_w; x++)
++ {
++ int in_pixel_index = x * 2;
++ ring_buffer_entry[in_pixel_index + 0] +=
horizontal_buffer[in_pixel_index + 0] * coefficient;
++ ring_buffer_entry[in_pixel_index + 1] +=
horizontal_buffer[in_pixel_index + 1] * coefficient;
++ }
++ break;
++ case 3:
++ for (x = 0; x < output_w; x++)
++ {
++ int in_pixel_index = x * 3;
++ ring_buffer_entry[in_pixel_index + 0] +=
horizontal_buffer[in_pixel_index + 0] * coefficient;
++ ring_buffer_entry[in_pixel_index + 1] +=
horizontal_buffer[in_pixel_index + 1] * coefficient;
++ ring_buffer_entry[in_pixel_index + 2] +=
horizontal_buffer[in_pixel_index + 2] * coefficient;
++ }
++ break;
++ case 4:
++ for (x = 0; x < output_w; x++)
++ {
++ int in_pixel_index = x * 4;
++ ring_buffer_entry[in_pixel_index + 0] +=
horizontal_buffer[in_pixel_index + 0] * coefficient;
++ ring_buffer_entry[in_pixel_index + 1] +=
horizontal_buffer[in_pixel_index + 1] * coefficient;
++ ring_buffer_entry[in_pixel_index + 2] +=
horizontal_buffer[in_pixel_index + 2] * coefficient;
++ ring_buffer_entry[in_pixel_index + 3] +=
horizontal_buffer[in_pixel_index + 3] * coefficient;
++ }
++ break;
++ default:
++ for (x = 0; x < output_w; x++)
++ {
++ int in_pixel_index = x * channels;
++
++ int c;
++ for (c = 0; c < channels; c++)
++ ring_buffer_entry[in_pixel_index + c] +=
horizontal_buffer[in_pixel_index + c] * coefficient;
++ }
++ break;
++ }
++ }
++}
++
++static void stbir__buffer_loop_upsample(stbir__info* stbir_info)
++{
++ int y;
++ float scale_ratio = stbir_info->vertical_scale;
++ float out_scanlines_radius =
stbir__filter_info_table[stbir_info->vertical_filter].support(1/scale_ratio) *
scale_ratio;
++
++ STBIR_ASSERT(stbir__use_height_upsampling(stbir_info));
++
++ for (y = 0; y < stbir_info->output_h; y++)
++ {
++ float in_center_of_out = 0; // Center of the current out scanline in
the in scanline space
++ int in_first_scanline = 0, in_last_scanline = 0;
++
++ stbir__calculate_sample_range_upsample(y, out_scanlines_radius,
scale_ratio, stbir_info->vertical_shift, &in_first_scanline, &in_last_scanline,
&in_center_of_out);
++
++ STBIR_ASSERT(in_last_scanline - in_first_scanline + 1 <=
stbir_info->ring_buffer_num_entries);
++
++ if (stbir_info->ring_buffer_begin_index >= 0)
++ {
++ // Get rid of whatever we don't need anymore.
++ while (in_first_scanline > stbir_info->ring_buffer_first_scanline)
++ {
++ if (stbir_info->ring_buffer_first_scanline ==
stbir_info->ring_buffer_last_scanline)
++ {
++ // We just popped the last scanline off the ring buffer.
++ // Reset it to the empty state.
++ stbir_info->ring_buffer_begin_index = -1;
++ stbir_info->ring_buffer_first_scanline = 0;
++ stbir_info->ring_buffer_last_scanline = 0;
++ break;
++ }
++ else
++ {
++ stbir_info->ring_buffer_first_scanline++;
++ stbir_info->ring_buffer_begin_index =
(stbir_info->ring_buffer_begin_index + 1) % stbir_info->ring_buffer_num_entries;
++ }
++ }
++ }
++
++ // Load in new ones.
++ if (stbir_info->ring_buffer_begin_index < 0)
++ stbir__decode_and_resample_upsample(stbir_info,
in_first_scanline);
++
++ while (in_last_scanline > stbir_info->ring_buffer_last_scanline)
++ stbir__decode_and_resample_upsample(stbir_info,
stbir_info->ring_buffer_last_scanline + 1);
++
++ // Now all buffers should be ready to write a row of vertical
sampling.
++ stbir__resample_vertical_upsample(stbir_info, y);
++
++ STBIR_PROGRESS_REPORT((float)y / stbir_info->output_h);
++ }
++}
++
++static void stbir__empty_ring_buffer(stbir__info* stbir_info, int
first_necessary_scanline)
++{
++ int output_stride_bytes = stbir_info->output_stride_bytes;
++ int channels = stbir_info->channels;
++ int alpha_channel = stbir_info->alpha_channel;
++ int type = stbir_info->type;
++ int colorspace = stbir_info->colorspace;
++ int output_w = stbir_info->output_w;
++ void* output_data = stbir_info->output_data;
++ int decode = STBIR__DECODE(type, colorspace);
++
++ float* ring_buffer = stbir_info->ring_buffer;
++ int ring_buffer_length =
stbir_info->ring_buffer_length_bytes/sizeof(float);
++
++ if (stbir_info->ring_buffer_begin_index >= 0)
++ {
++ // Get rid of whatever we don't need anymore.
++ while (first_necessary_scanline >
stbir_info->ring_buffer_first_scanline)
++ {
++ if (stbir_info->ring_buffer_first_scanline >= 0 &&
stbir_info->ring_buffer_first_scanline < stbir_info->output_h)
++ {
++ int output_row_start = stbir_info->ring_buffer_first_scanline
* output_stride_bytes;
++ float* ring_buffer_entry =
stbir__get_ring_buffer_entry(ring_buffer, stbir_info->ring_buffer_begin_index,
ring_buffer_length);
++ stbir__encode_scanline(stbir_info, output_w, (char *)
output_data + output_row_start, ring_buffer_entry, channels, alpha_channel,
decode);
++
STBIR_PROGRESS_REPORT((float)stbir_info->ring_buffer_first_scanline /
stbir_info->output_h);
++ }
++
++ if (stbir_info->ring_buffer_first_scanline ==
stbir_info->ring_buffer_last_scanline)
++ {
++ // We just popped the last scanline off the ring buffer.
++ // Reset it to the empty state.
++ stbir_info->ring_buffer_begin_index = -1;
++ stbir_info->ring_buffer_first_scanline = 0;
++ stbir_info->ring_buffer_last_scanline = 0;
++ break;
++ }
++ else
++ {
++ stbir_info->ring_buffer_first_scanline++;
++ stbir_info->ring_buffer_begin_index =
(stbir_info->ring_buffer_begin_index + 1) % stbir_info->ring_buffer_num_entries;
++ }
++ }
++ }
++}
++
++static void stbir__buffer_loop_downsample(stbir__info* stbir_info)
++{
++ int y;
++ float scale_ratio = stbir_info->vertical_scale;
++ int output_h = stbir_info->output_h;
++ float in_pixels_radius =
stbir__filter_info_table[stbir_info->vertical_filter].support(scale_ratio) /
scale_ratio;
++ int pixel_margin = stbir_info->vertical_filter_pixel_margin;
++ int max_y = stbir_info->input_h + pixel_margin;
++
++ STBIR_ASSERT(!stbir__use_height_upsampling(stbir_info));
++
++ for (y = -pixel_margin; y < max_y; y++)
++ {
++ float out_center_of_in; // Center of the current out scanline in the
in scanline space
++ int out_first_scanline, out_last_scanline;
++
++ stbir__calculate_sample_range_downsample(y, in_pixels_radius,
scale_ratio, stbir_info->vertical_shift, &out_first_scanline,
&out_last_scanline, &out_center_of_in);
++
++ STBIR_ASSERT(out_last_scanline - out_first_scanline + 1 <=
stbir_info->ring_buffer_num_entries);
++
++ if (out_last_scanline < 0 || out_first_scanline >= output_h)
++ continue;
++
++ stbir__empty_ring_buffer(stbir_info, out_first_scanline);
++
++ stbir__decode_and_resample_downsample(stbir_info, y);
++
++ // Load in new ones.
++ if (stbir_info->ring_buffer_begin_index < 0)
++ stbir__add_empty_ring_buffer_entry(stbir_info,
out_first_scanline);
++
++ while (out_last_scanline > stbir_info->ring_buffer_last_scanline)
++ stbir__add_empty_ring_buffer_entry(stbir_info,
stbir_info->ring_buffer_last_scanline + 1);
++
++ // Now the horizontal buffer is ready to write to all ring buffer
rows.
++ stbir__resample_vertical_downsample(stbir_info, y);
++ }
++
++ stbir__empty_ring_buffer(stbir_info, stbir_info->output_h);
++}
++
++static void stbir__setup(stbir__info *info, int input_w, int input_h, int
output_w, int output_h, int channels)
++{
++ info->input_w = input_w;
++ info->input_h = input_h;
++ info->output_w = output_w;
++ info->output_h = output_h;
++ info->channels = channels;
++}
++
++static void stbir__calculate_transform(stbir__info *info, float s0, float t0,
float s1, float t1, float *transform)
++{
++ info->s0 = s0;
++ info->t0 = t0;
++ info->s1 = s1;
++ info->t1 = t1;
++
++ if (transform)
++ {
++ info->horizontal_scale = transform[0];
++ info->vertical_scale = transform[1];
++ info->horizontal_shift = transform[2];
++ info->vertical_shift = transform[3];
++ }
++ else
++ {
++ info->horizontal_scale = ((float)info->output_w / info->input_w) /
(s1 - s0);
++ info->vertical_scale = ((float)info->output_h / info->input_h) / (t1
- t0);
++
++ info->horizontal_shift = s0 * info->output_w / (s1 - s0);
++ info->vertical_shift = t0 * info->output_h / (t1 - t0);
++ }
++}
++
++static void stbir__choose_filter(stbir__info *info, stbir_filter h_filter,
stbir_filter v_filter)
++{
++ if (h_filter == 0)
++ h_filter = stbir__use_upsampling(info->horizontal_scale) ?
STBIR_DEFAULT_FILTER_UPSAMPLE : STBIR_DEFAULT_FILTER_DOWNSAMPLE;
++ if (v_filter == 0)
++ v_filter = stbir__use_upsampling(info->vertical_scale) ?
STBIR_DEFAULT_FILTER_UPSAMPLE : STBIR_DEFAULT_FILTER_DOWNSAMPLE;
++ info->horizontal_filter = h_filter;
++ info->vertical_filter = v_filter;
++}
++
++static stbir_uint32 stbir__calculate_memory(stbir__info *info)
++{
++ int pixel_margin =
stbir__get_filter_pixel_margin(info->horizontal_filter, info->horizontal_scale);
++ int filter_height = stbir__get_filter_pixel_width(info->vertical_filter,
info->vertical_scale);
++
++ info->horizontal_num_contributors =
stbir__get_contributors(info->horizontal_scale, info->horizontal_filter,
info->input_w, info->output_w);
++ info->vertical_num_contributors =
stbir__get_contributors(info->vertical_scale , info->vertical_filter ,
info->input_h, info->output_h);
++
++ // One extra entry because floating point precision problems sometimes
cause an extra to be necessary.
++ info->ring_buffer_num_entries = filter_height + 1;
++
++ info->horizontal_contributors_size = info->horizontal_num_contributors *
sizeof(stbir__contributors);
++ info->horizontal_coefficients_size =
stbir__get_total_horizontal_coefficients(info) * sizeof(float);
++ info->vertical_contributors_size = info->vertical_num_contributors *
sizeof(stbir__contributors);
++ info->vertical_coefficients_size =
stbir__get_total_vertical_coefficients(info) * sizeof(float);
++ info->decode_buffer_size = (info->input_w + pixel_margin * 2) *
info->channels * sizeof(float);
++ info->horizontal_buffer_size = info->output_w * info->channels *
sizeof(float);
++ info->ring_buffer_size = info->output_w * info->channels *
info->ring_buffer_num_entries * sizeof(float);
++ info->encode_buffer_size = info->output_w * info->channels *
sizeof(float);
++
++ STBIR_ASSERT(info->horizontal_filter != 0);
++ STBIR_ASSERT(info->horizontal_filter <
STBIR__ARRAY_SIZE(stbir__filter_info_table)); // this now happens too late
++ STBIR_ASSERT(info->vertical_filter != 0);
++ STBIR_ASSERT(info->vertical_filter <
STBIR__ARRAY_SIZE(stbir__filter_info_table)); // this now happens too late
++
++ if (stbir__use_height_upsampling(info))
++ // The horizontal buffer is for when we're downsampling the height
and we
++ // can't output the result of sampling the decode buffer directly
into the
++ // ring buffers.
++ info->horizontal_buffer_size = 0;
++ else
++ // The encode buffer is to retain precision in the height upsampling
method
++ // and isn't used when height downsampling.
++ info->encode_buffer_size = 0;
++
++ return info->horizontal_contributors_size +
info->horizontal_coefficients_size
++ + info->vertical_contributors_size + info->vertical_coefficients_size
++ + info->decode_buffer_size + info->horizontal_buffer_size
++ + info->ring_buffer_size + info->encode_buffer_size;
++}
++
++static int stbir__resize_allocated(stbir__info *info,
++ const void* input_data, int input_stride_in_bytes,
++ void* output_data, int output_stride_in_bytes,
++ int alpha_channel, stbir_uint32 flags, stbir_datatype type,
++ stbir_edge edge_horizontal, stbir_edge edge_vertical, stbir_colorspace
colorspace,
++ void* tempmem, size_t tempmem_size_in_bytes)
++{
++ size_t memory_required = stbir__calculate_memory(info);
++
++ int width_stride_input = input_stride_in_bytes ? input_stride_in_bytes :
info->channels * info->input_w * stbir__type_size[type];
++ int width_stride_output = output_stride_in_bytes ? output_stride_in_bytes
: info->channels * info->output_w * stbir__type_size[type];
++
++#ifdef STBIR_DEBUG_OVERWRITE_TEST
++#define OVERWRITE_ARRAY_SIZE 8
++ unsigned char overwrite_output_before_pre[OVERWRITE_ARRAY_SIZE];
++ unsigned char overwrite_tempmem_before_pre[OVERWRITE_ARRAY_SIZE];
++ unsigned char overwrite_output_after_pre[OVERWRITE_ARRAY_SIZE];
++ unsigned char overwrite_tempmem_after_pre[OVERWRITE_ARRAY_SIZE];
++
++ size_t begin_forbidden = width_stride_output * (info->output_h - 1) +
info->output_w * info->channels * stbir__type_size[type];
++ memcpy(overwrite_output_before_pre, &((unsigned
char*)output_data)[-OVERWRITE_ARRAY_SIZE], OVERWRITE_ARRAY_SIZE);
++ memcpy(overwrite_output_after_pre, &((unsigned
char*)output_data)[begin_forbidden], OVERWRITE_ARRAY_SIZE);
++ memcpy(overwrite_tempmem_before_pre, &((unsigned
char*)tempmem)[-OVERWRITE_ARRAY_SIZE], OVERWRITE_ARRAY_SIZE);
++ memcpy(overwrite_tempmem_after_pre, &((unsigned
char*)tempmem)[tempmem_size_in_bytes], OVERWRITE_ARRAY_SIZE);
++#endif
++
++ STBIR_ASSERT(info->channels >= 0);
++ STBIR_ASSERT(info->channels <= STBIR_MAX_CHANNELS);
++
++ if (info->channels < 0 || info->channels > STBIR_MAX_CHANNELS)
++ return 0;
++
++ STBIR_ASSERT(info->horizontal_filter <
STBIR__ARRAY_SIZE(stbir__filter_info_table));
++ STBIR_ASSERT(info->vertical_filter <
STBIR__ARRAY_SIZE(stbir__filter_info_table));
++
++ if (info->horizontal_filter >=
STBIR__ARRAY_SIZE(stbir__filter_info_table))
++ return 0;
++ if (info->vertical_filter >= STBIR__ARRAY_SIZE(stbir__filter_info_table))
++ return 0;
++
++ if (alpha_channel < 0)
++ flags |= STBIR_FLAG_ALPHA_USES_COLORSPACE |
STBIR_FLAG_ALPHA_PREMULTIPLIED;
++
++ if (!(flags&STBIR_FLAG_ALPHA_USES_COLORSPACE) ||
!(flags&STBIR_FLAG_ALPHA_PREMULTIPLIED)) {
++ STBIR_ASSERT(alpha_channel >= 0 && alpha_channel < info->channels);
++ }
++
++ if (alpha_channel >= info->channels)
++ return 0;
++
++ STBIR_ASSERT(tempmem);
++
++ if (!tempmem)
++ return 0;
++
++ STBIR_ASSERT(tempmem_size_in_bytes >= memory_required);
++
++ if (tempmem_size_in_bytes < memory_required)
++ return 0;
++
++ memset(tempmem, 0, tempmem_size_in_bytes);
++
++ info->input_data = input_data;
++ info->input_stride_bytes = width_stride_input;
++
++ info->output_data = output_data;
++ info->output_stride_bytes = width_stride_output;
++
++ info->alpha_channel = alpha_channel;
++ info->flags = flags;
++ info->type = type;
++ info->edge_horizontal = edge_horizontal;
++ info->edge_vertical = edge_vertical;
++ info->colorspace = colorspace;
++
++ info->horizontal_coefficient_width = stbir__get_coefficient_width
(info->horizontal_filter, info->horizontal_scale);
++ info->vertical_coefficient_width = stbir__get_coefficient_width
(info->vertical_filter , info->vertical_scale );
++ info->horizontal_filter_pixel_width = stbir__get_filter_pixel_width
(info->horizontal_filter, info->horizontal_scale);
++ info->vertical_filter_pixel_width = stbir__get_filter_pixel_width
(info->vertical_filter , info->vertical_scale );
++ info->horizontal_filter_pixel_margin =
stbir__get_filter_pixel_margin(info->horizontal_filter, info->horizontal_scale);
++ info->vertical_filter_pixel_margin =
stbir__get_filter_pixel_margin(info->vertical_filter , info->vertical_scale );
++
++ info->ring_buffer_length_bytes = info->output_w * info->channels *
sizeof(float);
++ info->decode_buffer_pixels = info->input_w +
info->horizontal_filter_pixel_margin * 2;
++
++#define STBIR__NEXT_MEMPTR(current, newtype) (newtype*)(((unsigned
char*)current) + current##_size)
++
++ info->horizontal_contributors = (stbir__contributors *) tempmem;
++ info->horizontal_coefficients =
STBIR__NEXT_MEMPTR(info->horizontal_contributors, float);
++ info->vertical_contributors =
STBIR__NEXT_MEMPTR(info->horizontal_coefficients, stbir__contributors);
++ info->vertical_coefficients =
STBIR__NEXT_MEMPTR(info->vertical_contributors, float);
++ info->decode_buffer = STBIR__NEXT_MEMPTR(info->vertical_coefficients,
float);
++
++ if (stbir__use_height_upsampling(info))
++ {
++ info->horizontal_buffer = NULL;
++ info->ring_buffer = STBIR__NEXT_MEMPTR(info->decode_buffer, float);
++ info->encode_buffer = STBIR__NEXT_MEMPTR(info->ring_buffer, float);
++
++ STBIR_ASSERT((size_t)STBIR__NEXT_MEMPTR(info->encode_buffer, unsigned
char) == (size_t)tempmem + tempmem_size_in_bytes);
++ }
++ else
++ {
++ info->horizontal_buffer = STBIR__NEXT_MEMPTR(info->decode_buffer,
float);
++ info->ring_buffer = STBIR__NEXT_MEMPTR(info->horizontal_buffer,
float);
++ info->encode_buffer = NULL;
++
++ STBIR_ASSERT((size_t)STBIR__NEXT_MEMPTR(info->ring_buffer, unsigned
char) == (size_t)tempmem + tempmem_size_in_bytes);
++ }
++
++#undef STBIR__NEXT_MEMPTR
++
++ // This signals that the ring buffer is empty
++ info->ring_buffer_begin_index = -1;
++
++ stbir__calculate_filters(info->horizontal_contributors,
info->horizontal_coefficients, info->horizontal_filter, info->horizontal_scale,
info->horizontal_shift, info->input_w, info->output_w);
++ stbir__calculate_filters(info->vertical_contributors,
info->vertical_coefficients, info->vertical_filter, info->vertical_scale,
info->vertical_shift, info->input_h, info->output_h);
++
++ STBIR_PROGRESS_REPORT(0);
++
++ if (stbir__use_height_upsampling(info))
++ stbir__buffer_loop_upsample(info);
++ else
++ stbir__buffer_loop_downsample(info);
++
++ STBIR_PROGRESS_REPORT(1);
++
++#ifdef STBIR_DEBUG_OVERWRITE_TEST
++ STBIR_ASSERT(memcmp(overwrite_output_before_pre, &((unsigned
char*)output_data)[-OVERWRITE_ARRAY_SIZE], OVERWRITE_ARRAY_SIZE) == 0);
++ STBIR_ASSERT(memcmp(overwrite_output_after_pre, &((unsigned
char*)output_data)[begin_forbidden], OVERWRITE_ARRAY_SIZE) == 0);
++ STBIR_ASSERT(memcmp(overwrite_tempmem_before_pre, &((unsigned
char*)tempmem)[-OVERWRITE_ARRAY_SIZE], OVERWRITE_ARRAY_SIZE) == 0);
++ STBIR_ASSERT(memcmp(overwrite_tempmem_after_pre, &((unsigned
char*)tempmem)[tempmem_size_in_bytes], OVERWRITE_ARRAY_SIZE) == 0);
++#endif
++
++ return 1;
++}
++
++
++static int stbir__resize_arbitrary(
++ void *alloc_context,
++ const void* input_data, int input_w, int input_h, int
input_stride_in_bytes,
++ void* output_data, int output_w, int output_h, int output_stride_in_bytes,
++ float s0, float t0, float s1, float t1, float *transform,
++ int channels, int alpha_channel, stbir_uint32 flags, stbir_datatype type,
++ stbir_filter h_filter, stbir_filter v_filter,
++ stbir_edge edge_horizontal, stbir_edge edge_vertical, stbir_colorspace
colorspace)
++{
++ stbir__info info;
++ int result;
++ size_t memory_required;
++ void* extra_memory;
++
++ stbir__setup(&info, input_w, input_h, output_w, output_h, channels);
++ stbir__calculate_transform(&info, s0,t0,s1,t1,transform);
++ stbir__choose_filter(&info, h_filter, v_filter);
++ memory_required = stbir__calculate_memory(&info);
++ extra_memory = STBIR_MALLOC(memory_required, alloc_context);
++
++ if (!extra_memory)
++ return 0;
++
++ result = stbir__resize_allocated(&info, input_data, input_stride_in_bytes,
++ output_data,
output_stride_in_bytes,
++ alpha_channel, flags, type,
++ edge_horizontal, edge_vertical,
++ colorspace, extra_memory,
memory_required);
++
++ STBIR_FREE(extra_memory, alloc_context);
++
++ return result;
++}
++
++STBIRDEF int stbir_resize_uint8( const unsigned char *input_pixels , int
input_w , int input_h , int input_stride_in_bytes,
++ unsigned char *output_pixels, int
output_w, int output_h, int output_stride_in_bytes,
++ int num_channels)
++{
++ return stbir__resize_arbitrary(NULL, input_pixels, input_w, input_h,
input_stride_in_bytes,
++ output_pixels, output_w, output_h, output_stride_in_bytes,
++ 0,0,1,1,NULL,num_channels,-1,0, STBIR_TYPE_UINT8,
STBIR_FILTER_DEFAULT, STBIR_FILTER_DEFAULT,
++ STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_COLORSPACE_LINEAR);
++}
++
++STBIRDEF int stbir_resize_float( const float *input_pixels , int input_w
, int input_h , int input_stride_in_bytes,
++ float *output_pixels, int
output_w, int output_h, int output_stride_in_bytes,
++ int num_channels)
++{
++ return stbir__resize_arbitrary(NULL, input_pixels, input_w, input_h,
input_stride_in_bytes,
++ output_pixels, output_w, output_h, output_stride_in_bytes,
++ 0,0,1,1,NULL,num_channels,-1,0, STBIR_TYPE_FLOAT,
STBIR_FILTER_DEFAULT, STBIR_FILTER_DEFAULT,
++ STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_COLORSPACE_LINEAR);
++}
++
++STBIRDEF int stbir_resize_uint8_srgb(const unsigned char *input_pixels , int
input_w , int input_h , int input_stride_in_bytes,
++ unsigned char *output_pixels, int
output_w, int output_h, int output_stride_in_bytes,
++ int num_channels, int alpha_channel, int
flags)
++{
++ return stbir__resize_arbitrary(NULL, input_pixels, input_w, input_h,
input_stride_in_bytes,
++ output_pixels, output_w, output_h, output_stride_in_bytes,
++ 0,0,1,1,NULL,num_channels,alpha_channel,flags, STBIR_TYPE_UINT8,
STBIR_FILTER_DEFAULT, STBIR_FILTER_DEFAULT,
++ STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_COLORSPACE_SRGB);
++}
++
++STBIRDEF int stbir_resize_uint8_srgb_edgemode(const unsigned char
*input_pixels , int input_w , int input_h , int input_stride_in_bytes,
++ unsigned char
*output_pixels, int output_w, int output_h, int output_stride_in_bytes,
++ int num_channels, int
alpha_channel, int flags,
++ stbir_edge edge_wrap_mode)
++{
++ return stbir__resize_arbitrary(NULL, input_pixels, input_w, input_h,
input_stride_in_bytes,
++ output_pixels, output_w, output_h, output_stride_in_bytes,
++ 0,0,1,1,NULL,num_channels,alpha_channel,flags, STBIR_TYPE_UINT8,
STBIR_FILTER_DEFAULT, STBIR_FILTER_DEFAULT,
++ edge_wrap_mode, edge_wrap_mode, STBIR_COLORSPACE_SRGB);
++}
++
++STBIRDEF int stbir_resize_uint8_generic( const unsigned char *input_pixels ,
int input_w , int input_h , int input_stride_in_bytes,
++ unsigned char *output_pixels,
int output_w, int output_h, int output_stride_in_bytes,
++ int num_channels, int alpha_channel,
int flags,
++ stbir_edge edge_wrap_mode,
stbir_filter filter, stbir_colorspace space,
++ void *alloc_context)
++{
++ return stbir__resize_arbitrary(alloc_context, input_pixels, input_w,
input_h, input_stride_in_bytes,
++ output_pixels, output_w, output_h, output_stride_in_bytes,
++ 0,0,1,1,NULL,num_channels,alpha_channel,flags, STBIR_TYPE_UINT8,
filter, filter,
++ edge_wrap_mode, edge_wrap_mode, space);
++}
++
++STBIRDEF int stbir_resize_uint16_generic(const stbir_uint16 *input_pixels ,
int input_w , int input_h , int input_stride_in_bytes,
++ stbir_uint16 *output_pixels ,
int output_w, int output_h, int output_stride_in_bytes,
++ int num_channels, int alpha_channel,
int flags,
++ stbir_edge edge_wrap_mode,
stbir_filter filter, stbir_colorspace space,
++ void *alloc_context)
++{
++ return stbir__resize_arbitrary(alloc_context, input_pixels, input_w,
input_h, input_stride_in_bytes,
++ output_pixels, output_w, output_h, output_stride_in_bytes,
++ 0,0,1,1,NULL,num_channels,alpha_channel,flags, STBIR_TYPE_UINT16,
filter, filter,
++ edge_wrap_mode, edge_wrap_mode, space);
++}
++
++
++STBIRDEF int stbir_resize_float_generic( const float *input_pixels ,
int input_w , int input_h , int input_stride_in_bytes,
++ float *output_pixels ,
int output_w, int output_h, int output_stride_in_bytes,
++ int num_channels, int alpha_channel,
int flags,
++ stbir_edge edge_wrap_mode,
stbir_filter filter, stbir_colorspace space,
++ void *alloc_context)
++{
++ return stbir__resize_arbitrary(alloc_context, input_pixels, input_w,
input_h, input_stride_in_bytes,
++ output_pixels, output_w, output_h, output_stride_in_bytes,
++ 0,0,1,1,NULL,num_channels,alpha_channel,flags, STBIR_TYPE_FLOAT,
filter, filter,
++ edge_wrap_mode, edge_wrap_mode, space);
++}
++
++
++STBIRDEF int stbir_resize( const void *input_pixels , int input_w ,
int input_h , int input_stride_in_bytes,
++ void *output_pixels, int output_w,
int output_h, int output_stride_in_bytes,
++ stbir_datatype datatype,
++ int num_channels, int alpha_channel, int
flags,
++ stbir_edge edge_mode_horizontal,
stbir_edge edge_mode_vertical,
++ stbir_filter filter_horizontal,
stbir_filter filter_vertical,
++ stbir_colorspace space, void
*alloc_context)
++{
++ return stbir__resize_arbitrary(alloc_context, input_pixels, input_w,
input_h, input_stride_in_bytes,
++ output_pixels, output_w, output_h, output_stride_in_bytes,
++ 0,0,1,1,NULL,num_channels,alpha_channel,flags, datatype,
filter_horizontal, filter_vertical,
++ edge_mode_horizontal, edge_mode_vertical, space);
++}
++
++
++STBIRDEF int stbir_resize_subpixel(const void *input_pixels , int input_w ,
int input_h , int input_stride_in_bytes,
++ void *output_pixels, int output_w,
int output_h, int output_stride_in_bytes,
++ stbir_datatype datatype,
++ int num_channels, int alpha_channel, int
flags,
++ stbir_edge edge_mode_horizontal,
stbir_edge edge_mode_vertical,
++ stbir_filter filter_horizontal,
stbir_filter filter_vertical,
++ stbir_colorspace space, void
*alloc_context,
++ float x_scale, float y_scale,
++ float x_offset, float y_offset)
++{
++ float transform[4];
++ transform[0] = x_scale;
++ transform[1] = y_scale;
++ transform[2] = x_offset;
++ transform[3] = y_offset;
++ return stbir__resize_arbitrary(alloc_context, input_pixels, input_w,
input_h, input_stride_in_bytes,
++ output_pixels, output_w, output_h, output_stride_in_bytes,
++ 0,0,1,1,transform,num_channels,alpha_channel,flags, datatype,
filter_horizontal, filter_vertical,
++ edge_mode_horizontal, edge_mode_vertical, space);
++}
++
++STBIRDEF int stbir_resize_region( const void *input_pixels , int input_w ,
int input_h , int input_stride_in_bytes,
++ void *output_pixels, int output_w,
int output_h, int output_stride_in_bytes,
++ stbir_datatype datatype,
++ int num_channels, int alpha_channel, int
flags,
++ stbir_edge edge_mode_horizontal,
stbir_edge edge_mode_vertical,
++ stbir_filter filter_horizontal,
stbir_filter filter_vertical,
++ stbir_colorspace space, void
*alloc_context,
++ float s0, float t0, float s1, float t1)
++{
++ return stbir__resize_arbitrary(alloc_context, input_pixels, input_w,
input_h, input_stride_in_bytes,
++ output_pixels, output_w, output_h, output_stride_in_bytes,
++ s0,t0,s1,t1,NULL,num_channels,alpha_channel,flags, datatype,
filter_horizontal, filter_vertical,
++ edge_mode_horizontal, edge_mode_vertical, space);
++}
++
++#endif // STB_IMAGE_RESIZE_IMPLEMENTATION
++
++/*
++------------------------------------------------------------------------------
++This software is available under 2 licenses -- choose whichever you prefer.
++------------------------------------------------------------------------------
++ALTERNATIVE A - MIT License
++Copyright (c) 2017 Sean Barrett
++Permission is hereby granted, free of charge, to any person obtaining a copy
of
++this software and associated documentation files (the "Software"), to deal in
++the Software without restriction, including without limitation the rights to
++use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
++of the Software, and to permit persons to whom the Software is furnished to do
++so, subject to the following conditions:
++The above copyright notice and this permission notice shall be included in all
++copies or substantial portions of the Software.
++THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
++IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
++FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
++AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
++LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
++OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
++SOFTWARE.
++------------------------------------------------------------------------------
++ALTERNATIVE B - Public Domain (www.unlicense.org)
++This is free and unencumbered software released into the public domain.
++Anyone is free to copy, modify, publish, use, compile, sell, or distribute
this
++software, either in source code form or as a compiled binary, for any purpose,
++commercial or non-commercial, and by any means.
++In jurisdictions that recognize copyright laws, the author or authors of this
++software dedicate any and all copyright interest in the software to the public
++domain. We make this dedication for the benefit of the public at large and to
++the detriment of our heirs and successors. We intend this dedication to be an
++overt act of relinquishment in perpetuity of all present and future rights to
++this software under copyright law.
++THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
++IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
++FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
++AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
++ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
++WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
++------------------------------------------------------------------------------
++*/
diff --git a/dwm.suckless.org/patches/winicon/index.md
b/dwm.suckless.org/patches/winicon/index.md
new file mode 100644
index 00000000..1d29c6f7
--- /dev/null
+++ b/dwm.suckless.org/patches/winicon/index.md
@@ -0,0 +1,23 @@
+winicon
+========
+
+Description
+-----------
+**dwm-winicon** is a patch that enables dwm to show window icons.
+
+
+
+The project is being managed and developed on this GitHub
[repo](https://github.com/AdamYuan/dwm-winicon). If you discover any bugs or
have any idea to optimize it, feel free to create an issue there.
+
+Configuration
+-------------
+ #define ICONSIZE 20 /* icon size in pixels */
+ #define ICONSPACING 5 /* space (pixels) between icon and title */
+
+Download
+--------
+* [dwm-winicon-6.2-v1.diff](dwm-winicon-6.2-v1.diff)
+
+Author
+------
+* Adam Yuan - `<y13916619121 at 126 dot com>`
diff --git a/dwm.suckless.org/patches/winicon/screenshots.png
b/dwm.suckless.org/patches/winicon/screenshots.png
new file mode 100644
index 00000000..313faec5
Binary files /dev/null and b/dwm.suckless.org/patches/winicon/screenshots.png
differ
