On Friday, 1 January 2016 at 22:00:04 UTC, TheDGuy wrote:
On Friday, 1 January 2016 at 19:32:40 UTC, Basile B. wrote:
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.
Ahm, i am not quite sure if you and [Mike Wey] talk about the
same thing. And i posted the error message in my last post when
i try to call "cairo_image_surface_create_for_data". I still
don't know where i am able to call the function?
I took a look into the source code of cairo and in the
"ImageSurface.d"-file there is a function called "createForData"
but if i try to use it like this:
cairo.ImageSurface.createForData(c,cairo.FORMAT_ARGB32,256,256,256*4);
i get: "undefined identifier 'createForData' in module
'cairo.ImageSurface'
That is just one example of my experience using D:
some things are easy to understand but in other cases: even if
you think it should work and you can proof it, it just doesn't or
you have to do it in a really inconvenient way. I am getting
frustrated
