Hey All,
I am trying to draw live images in Gtk::DrawingArea in the
same way as they are shown in monitors at railway stations, airports, metro
etc..
For current tesing purpose I have hardcoded my code.
here it is
Gtkk::Drawing area width=720, height=640.
I have first.pgm and second.pgm images each having 360*640
dimesions.(Yes, i rotated it for testing purpose.)
These images contains one byte per pixel.
1) drawing fine when drwing single image.
I just read the image into *unsigned char* buffer* of size 360*640*3.
i have read it like this
int bufferIndex=0;
int fileIndex=0; //just assume
for (int i=0; i<height; i++)
{
for (int j=0; j<width; j++)
{
//below three lines are for RGB purpose required in
Gdk::Pixbuf
buffer[bufferIndex++] = //File[fileIndex];
buffer[bufferIndex++] = //File[fileIndex];
buffer[bufferIndex++] = //File[fileIndex];
}
}
Gdk::Colorspace colorSpace = Gdk::COLORSPACE_RGB;
Gdk::Colorspace colorSpace = (Gdk::Colorspace)0;
bool has_alpha = false;
int bits_per_sample = 8;
int rowStride = 360*3; // distance between rows in bytes
Glib::RefPtr<Gdk::Pixbuf> pixBuf =
Gdk::Pixbuf::create_from_data((const guint8 *) buffer,
colorSpace, has_alpha, bits_per_sample, 360, 640, rowStride);
Glib::RefPtr<Gdk::GC> gcContext;
pixBuf->render_to_drawable(drawingArea pointer, gcContext, 0, 0, 0 ,
0 , 360, 640, Gdk::RGB_DITHER_MAX, 0, 0);
//It prints the image in the left half of drawing area.
IT IS SAME AS I EXPECTED.
* REAL PROBLEM COMES WHEN I DRAW TWO IMAGES.*
for that purpose I read first.pgm in buffer and after that i read
second.pgm (means total [360*640*3]*2 bytes)
Now i draw it as shown int the code.
Glib::RefPtr<Gdk::GC>gcContext;
Gdk::Colorspace colorSpace = Gdk::COLORSPACE_RGB;
Gdk::Colorspace colorSpace = (Gdk::Colorspace)0;
bool has_alpha = false;
int bits_per_sample = 8;
int rowStride = 360*3; // distance between rows in bytes
Glib::RefPtr<Gdk::Pixbuf> pixBuf = Gdk::Pixbuf::create_from_data((const
guint8 *) buffer,
colorSpace, has_alpha, bits_per_sample, 720, 640, rowStride);
pixBuf->render_to_drawable(drawingarea pointer, gcContext, 0, 0, 0 ,
0 , 720, 640, Gdk::RGB_DITHER_MAX, 0, 0);
Result::
In both half of the Gtk::Drwing area it prints first.pgm image
only???
--
View this message in context:
http://gtk.10911.n7.nabble.com/drawing-multiple-image-pgm-using-single-Ggk-Pixbuf-in-Gtk-Drawing-area-tp84746.html
Sent from the Gtkmm mailing list archive at Nabble.com.
_______________________________________________
gtkmm-list mailing list
gtkmm-list@gnome.org
https://mail.gnome.org/mailman/listinfo/gtkmm-list
