On Wednesday, 30 December 2015 at 23:20:23 UTC, Basile B. wrote:
On Wednesday, 30 December 2015 at 20:44:44 UTC, TheDGuy wrote:
Hello,
is there any way to get the pixel color of a single pixel by x
and y coordinates of a context?
render to a png back buffer.
see cairo_image_surface_create_for_data
then you'll be able to access the data and, at the same time,
to blit your buffer to screen.
Actually I was thinking to a user defined buffer type:
struct SurfaceBuffer
{
void* data; // used as param to create the surface
Rgba[] opIndex(size_t index);
Rgba[][] scanline();
}
that you would pass as data in
cairo_image_surface_create_for_data().
But gtk certainly has pitcure classes with the typical scanline
method and that you could use in
cairo_image_surface_create_for_data.
