From: Kristian Høgsberg <[email protected]>
This vfunc lets us read out a rectangle of pixels from the currently
attached surface buffer.
---
src/compositor.h | 3 +++
src/gl-renderer.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 56 insertions(+), 0 deletions(-)
diff --git a/src/compositor.h b/src/compositor.h
index 3437aea..aef18d8 100644
--- a/src/compositor.h
+++ b/src/compositor.h
@@ -500,6 +500,9 @@ struct weston_renderer {
pixman_format_code_t format, void *pixels,
uint32_t x, uint32_t y,
uint32_t width, uint32_t height);
+ int (*read_surface_pixels)(struct weston_surface *es,
+ pixman_format_code_t format, void *pixels,
+ int x, int y, int width, int height);
void (*repaint_output)(struct weston_output *output,
pixman_region32_t *output_damage);
void (*flush_damage)(struct weston_surface *surface);
diff --git a/src/gl-renderer.c b/src/gl-renderer.c
index f43e954..a49742b 100644
--- a/src/gl-renderer.c
+++ b/src/gl-renderer.c
@@ -94,6 +94,8 @@ struct gl_renderer {
int32_t width, height;
} border;
+ GLuint fbo;
+
struct wl_array vertices;
struct wl_array indices; /* only used in compositor-wayland */
struct wl_array vtxcnt;
@@ -849,6 +851,53 @@ repaint_surfaces(struct weston_output *output,
pixman_region32_t *damage)
draw_surface(surface, output, damage);
}
+static int
+gl_renderer_read_surface_pixels(struct weston_surface *es,
+ pixman_format_code_t format, void *pixels,
+ int x, int y, int width, int height)
+{
+ struct weston_buffer *buffer = es->buffer_ref.buffer;
+ struct weston_compositor *ec = es->compositor;
+ struct gl_renderer *gr = get_renderer(ec);
+ struct gl_surface_state *gs = get_surface_state(es);
+ GLenum gl_format;
+ int size;
+ struct wl_shm_buffer *shm_buffer = NULL;
+
+ switch (format) {
+ case PIXMAN_a8r8g8b8:
+ gl_format = GL_BGRA_EXT;
+ break;
+ case PIXMAN_a8b8g8r8:
+ gl_format = GL_RGBA;
+ break;
+ default:
+ return -1;
+ }
+
+ if (buffer) {
+ shm_buffer = wl_shm_buffer_get(buffer->resource);
+ }
+ if (shm_buffer) {
+ size = buffer->width * 4 * buffer->height;
+ memcpy(pixels, wl_shm_buffer_get_data(shm_buffer), size);
+ } else {
+ if (gr->fbo == 0)
+ glGenFramebuffers(1, &gr->fbo);
+ glBindFramebuffer(GL_FRAMEBUFFER, gr->fbo);
+ glFramebufferTexture2D(GL_FRAMEBUFFER,
+ GL_COLOR_ATTACHMENT0,
+ GL_TEXTURE_2D,
+ gs->textures[0], 0);
+
+ glReadPixels(x, y, width, height,
+ gl_format, GL_UNSIGNED_BYTE, pixels);
+
+ glBindFramebuffer(GL_FRAMEBUFFER, 0);
+ }
+
+ return 0;
+}
static int
texture_border(struct weston_output *output)
@@ -1779,6 +1828,9 @@ gl_renderer_destroy(struct weston_compositor *ec)
{
struct gl_renderer *gr = get_renderer(ec);
+ if (gr->fbo)
+ glDeleteFramebuffers(1, &gr->fbo);
+
if (gr->has_bind_display)
gr->unbind_display(gr->egl_display, ec->wl_display);
@@ -1874,6 +1926,7 @@ gl_renderer_create(struct weston_compositor *ec,
EGLNativeDisplayType display,
return -1;
gr->base.read_pixels = gl_renderer_read_pixels;
+ gr->base.read_surface_pixels = gl_renderer_read_surface_pixels;
gr->base.repaint_output = gl_renderer_repaint_output;
gr->base.flush_damage = gl_renderer_flush_damage;
gr->base.attach = gl_renderer_attach;
--
1.7.4.4
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