vulkan: Handle empty child bounds in repeat node

Also add test to the testsuite for it.

gsk/vulkan/gskvulkanimage.c

@@ -209,6 +209,8 @@ gsk_vulkan_image_new (GdkVulkanContext      *context,
   VkMemoryRequirements requirements;
   GskVulkanImage *self;
 
+  g_assert (width > 0 && height > 0);
+
   self = g_object_new (GSK_TYPE_VULKAN_IMAGE, NULL);
 
   self->vulkan = g_object_ref (context);

gsk/vulkan/gskvulkanrenderpass.c

@@ -725,6 +725,9 @@ gsk_vulkan_render_pass_add_repeat_node (GskVulkanRenderPass          *self,
     .render.node = node
   };
 
+  if (graphene_rect_get_area (gsk_repeat_node_get_child_bounds (node)) == 0)
+    return TRUE;
+
   if (gsk_vulkan_clip_contains_rect (&constants->clip, &node->bounds))
     pipeline_type = GSK_VULKAN_PIPELINE_TEXTURE;
   else if (constants->clip.type == GSK_VULKAN_CLIP_RECT)

testsuite/gsk/compare/repeat-empty-child-bounds.node

@@ -0,0 +1,24 @@
+repeat {
+  bounds: 0 0 100 100;
+  child-bounds: 0 0 0 0;
+  child: color {
+    bounds: 0 0 20 20;
+    color: rgb(255,0,0);
+  }
+}
+repeat {
+  bounds: 0 0 100 100;
+  child-bounds: 0 0 20 0;
+  child: color {
+    bounds: 0 0 20 20;
+    color: rgb(0,128,0);
+  }
+}
+repeat {
+  bounds: 0 0 100 100;
+  child-bounds: 0 0 0 20;
+  child: color {
+    bounds: 0 0 20 20;
+    color: rgb(0,0,255);
+  }
+}

testsuite/gsk/meson.build

@@ -77,6 +77,7 @@ compare_render_tests = [
   'outset_shadow_simple',
   'repeat',
   'repeat-no-repeat',
+  'repeat-empty-child-bounds',
   'repeat-negative-coords',
   'repeat-texture',
   'scale-textures-negative-ngl',