[cairo] Using Cairo GL surface as the main surface and supply cairo_image_surface as pattern won't work

[Henry (Yu) Song]

Maybe send your sample code to me?  By the way which branch do you use.  1.14.2-rebase-wip is the latest branch based on 1.14.2.  Your code might have a major performance problem.   If your app requires fill those multiple image surfaces to gl surface for every frame, the performance will be terrible.


> On Aug 14, 2015, at 8:20 AM, Chunlin Ye <pepsin at me.com> wrote:
> 
> I am tweaking an Cairo app on Android, and using the https://github.com/SRA-SiliconValley/cairogles as the GL based cairo.
> 
> For now I use cairo_gl_surface_create_for_egl to create an gl surface, call it Prime Surface, and my app create multiple layer of cairo_image_surface which created by cairo_image_surface_create_for_data and using them as pattern to draw onto the Prime Surface.
> 
> The drawing code are something like: 
> 
> cairo_pattern_t *pattern = cairo_pattern_create_for_surface(r->surface);
> int surfaceWidth = cairo_image_surface_get_width(r->surface);
> int surfaceHeight = cairo_image_surface_get_height(r->surface);
> cairo_rectangle(cr, 0, 0, surfaceWidth, surfaceHeight);
> cairo_set_source(cr, pattern);
> cairo_fill(cr);
> 
> but this do not work. I also tried:
> 
> cairo_set_source_surface(cr, image_surface, 0, 0);  
> cairo_paint(cr);
> 
> 
> don’t work too.
> 
> Do anybody know what causing this problem?
> 
> 
> 
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