[gtk: 32/72] gl renderer: Ignore rendering if accumulated opacity is too small

[Matthias Clasen <matthiasc src gnome org>]

commit bc034d1190a71b5aa4939daab7229c00e6ba0b90
Author: Timm Bäder <mail baedert org>
Date:   Thu Oct 1 08:29:10 2020 +0200

    gl renderer: Ignore rendering if accumulated opacity is too small

 gsk/gl/gskglrenderer.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)
---
diff --git a/gsk/gl/gskglrenderer.c b/gsk/gl/gskglrenderer.c
index edf6f402ce..9233799e0c 100644
--- a/gsk/gl/gskglrenderer.c
+++ b/gsk/gl/gskglrenderer.c
@@ -1375,20 +1375,24 @@ render_opacity_node (GskGLRenderer   *self,
       prev_opacity = ops_set_opacity (builder,
                                       builder->current_opacity * opacity);
 
-      ops_set_program (builder, &self->programs->blit_program);
-      ops_set_texture (builder, region.texture_id);
+      if (builder->current_opacity >= ((float) 0x00ff / (float) 0xffff))
+        {
+          ops_set_program (builder, &self->programs->blit_program);
+          ops_set_texture (builder, region.texture_id);
 
-      load_vertex_data_with_region (ops_draw (builder, NULL),
-                                    node, builder,
-                                    &region,
-                                    is_offscreen);
+          load_vertex_data_with_region (ops_draw (builder, NULL),
+                                        node, builder,
+                                        &region,
+                                        is_offscreen);
+        }
     }
   else
     {
       prev_opacity = ops_set_opacity (builder,
                                       builder->current_opacity * opacity);
 
-      gsk_gl_renderer_add_render_ops (self, child, builder);
+      if (builder->current_opacity >= ((float) 0x00ff / (float) 0xffff))
+        gsk_gl_renderer_add_render_ops (self, child, builder);
     }
 
   ops_set_opacity (builder, prev_opacity);