From: Benjamin Otte <otte@redhat.com>
Date: Mon, 13 Feb 2023 00:44:48 +0000 (+0100)
Subject: rendernode: Respect clip when drawing scale nodes
X-Git-Tag: archive/raspbian/4.12.3+ds-1+rpi1~1^2^2^2~22^2~6^2~2^2~3
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=22ba6b1f33dcbcab8d42d133b7f333ca6ff44679;p=gtk4.git

rendernode: Respect clip when drawing scale nodes

Scale nodes can use large scale factors and we don't want to create
insanely huge Cairo surfaces.

A subsequent commit will add the texture-scale-magnify-10000x
test which fails without this fix.
---

diff --git a/gsk/gskrendernodeimpl.c b/gsk/gskrendernodeimpl.c
index d0bd24b724..5d1f19da5b 100644
--- a/gsk/gskrendernodeimpl.c
+++ b/gsk/gskrendernodeimpl.c
@@ -1635,10 +1635,19 @@ gsk_texture_scale_node_draw (GskRenderNode *node,
   };
   cairo_t *cr2;
   cairo_surface_t *surface2;
+  graphene_rect_t clip_rect;
+
+  /* Make sure we draw the minimum region by using the clip */
+  gsk_cairo_rectangle (cr, &node->bounds);
+  cairo_clip (cr);
+  _graphene_rect_init_from_clip_extents (&clip_rect, cr);
+  if (clip_rect.size.width <= 0 || clip_rect.size.height <= 0)
+    return;
 
   surface2 = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
-                                         (int) ceilf (node->bounds.size.width),
-                                         (int) ceilf (node->bounds.size.height));
+                                         (int) ceilf (clip_rect.size.width),
+                                         (int) ceilf (clip_rect.size.height));
+  cairo_surface_set_device_offset (surface2, -clip_rect.origin.x, -clip_rect.origin.y);
   cr2 = cairo_create (surface2);
 
   surface = gdk_texture_download_surface (self->texture);