From: Matthias Clasen <mclasen@redhat.com>
Date: Wed, 31 May 2023 18:33:52 +0000 (-0400)
Subject: gsk: Support straight alpha textures
X-Git-Tag: archive/raspbian/4.12.3+ds-1+rpi1~1^2^2^2~22^2~1^2~197^2~1
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=957fa87fce32b4545dddc73b54c70c2ce9e52961;p=gtk4.git

gsk: Support straight alpha textures

This is not the optimal way of doing it: we're
reuploading the texture with client-side conversion.
But it fits nicely into our current handling of mipmaps.

We can do better once we use shaders for colorspace
conversions.
---

diff --git a/gsk/gl/gskgldriver.c b/gsk/gl/gskgldriver.c
index dec77c947a..cc27a89ef6 100644
--- a/gsk/gl/gskgldriver.c
+++ b/gsk/gl/gskgldriver.c
@@ -761,7 +761,8 @@ gsk_gl_driver_load_texture (GskGLDriver *self,
       GdkGLContext *texture_context = gdk_gl_texture_get_context (gl_texture);
 
       if (gdk_gl_context_is_shared (context, texture_context) &&
-          (!ensure_mipmap || gdk_gl_texture_has_mipmap (gl_texture)))
+          (!ensure_mipmap || gdk_gl_texture_has_mipmap (gl_texture)) &&
+          gdk_memory_format_alpha (gdk_texture_get_format (texture)) != GDK_MEMORY_ALPHA_STRAIGHT)
         {
           /* A GL texture from the same GL context is a simple task... */
           return gdk_gl_texture_get_id (gl_texture);