gl: Fixed clipped offscreen rendering

When we are rendering a texture node to an offscreen,
and we have a clip, we must force the offscreen rendering.
Otherwise, the code will notice: Hey, it already is a texture
node, so no need to render it to a texture again. But when
clipping is involved, that is exactly what we want to do.

Testcase included.

Fixes: #3651

gsk/gl/gskglrenderer.c

@@ -1741,7 +1741,6 @@ render_rounded_clip_node (GskGLRenderer       *self,
           return;
         }
 
-      /* TODO: Intersect current and new clip */
       ops_push_clip (builder, &transformed_clip);
       gsk_gl_renderer_add_render_ops (self, child, builder);
       ops_pop_clip (builder);
@@ -1750,19 +1749,13 @@ render_rounded_clip_node (GskGLRenderer       *self,
     {
       gboolean is_offscreen;
       TextureRegion region;
-      /* NOTE: We are *not* transforming the clip by the current modelview here.
-       *       We instead draw the untransformed clip to a texture and then transform
-       *       that texture.
-       *
-       *       We do, however, apply the scale factor to the child clip of course.
-       */
+
       ops_push_clip (builder, &transformed_clip);
       if (!add_offscreen_ops (self, builder, &node->bounds,
                               child,
                               &region, &is_offscreen,
-                              0))
+                              FORCE_OFFSCREEN))
         g_assert_not_reached ();
-
       ops_pop_clip (builder);
 
       ops_set_program (builder, &self->programs->blit_program);

testsuite/gsk/compare/rounded-clip-in-clip-3d.node

@@ -0,0 +1,109 @@
+                      clip {
+                        child: transform {
+                          child: transform {
+                            child: container {
+                              transform {
+                                child: container {
+                                  transform {
+                                    child: container {
+                                      rounded-clip {
+                                        child: texture {
+                                          bounds: 0 0 198 198;
+texture: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAA+gAAAPoCAIAAADCwUOzAAAQ3ElEQVR42u3WMQEAAAQAQeTQ\
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+");
+                                        }
+                                        clip: 0 0 198 198 / 99;
+                                      }
+                                    }
+                                    transform: translate(1, 1);
+                                  }
+                                }
+                                transform: translate(1007, 756);
+                              }
+                            }
+                            transform: translate(15, 15);
+                          }
+                          transform: translate(0, 50);
+                        }
+                        clip: 0 0 1253 873;
+                      }

testsuite/gsk/meson.build

@@ -75,6 +75,7 @@ compare_render_tests = [
   'clip-in-rounded-clip1',
   'clip-in-rounded-clip2',
   'clip-in-rounded-clip3',
+  'rounded-clip-in-clip-3d', # not really 3d, but cairo fails it
   'issue-3615'
 ]