On 01/02/2016 12:32 AM, TheDGuy wrote:
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'
```
import cairo.ImageSurface;
ImageSurface.createForData(c,cairo.FORMAT_ARGB32,256,256,256*4);
```
You need to import the ImageSurface module, and the createForData
function is in the ImageSurface class which is in the cairo.ImageSurface
module.
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
--
Mike Wey
