From: Benjamin Otte <otte@redhat.com>
Date: Mon, 5 Jun 2023 03:29:41 +0000 (+0200)
Subject: rendernode: Scale repeat offscreens properly
X-Git-Tag: archive/raspbian/4.12.3+ds-1+rpi1~1^2^2^2~59^2^2~183^2~2
X-Git-Url: https://dgit.raspbian.org/%22http://www.example.com/cgi/%22/%22http:/www.example.com/cgi/%22?a=commitdiff_plain;h=bba324ce3001523bd61f91c5f330771ff7bc065b;p=gtk4.git

rendernode: Scale repeat offscreens properly

Respect the matrix in use at time of encountering a repeat node so that
the offscreen uses roughly the same device pixel density as the target.

Fixes the handling of the clipped-repeat test.
---

diff --git a/gsk/gskrendernodeimpl.c b/gsk/gskrendernodeimpl.c
index 9a17de149a..33a317b735 100644
--- a/gsk/gskrendernodeimpl.c
+++ b/gsk/gskrendernodeimpl.c
@@ -3956,13 +3956,19 @@ gsk_repeat_node_draw (GskRenderNode *node,
   cairo_pattern_t *pattern;
   cairo_surface_t *surface;
   cairo_t *surface_cr;
-  double scale_x, scale_y;
+  double scale_x, scale_y, width, height;
+  cairo_matrix_t matrix;
 
+  cairo_get_matrix (cr, &matrix);
+  width = ceil (self->child_bounds.size.width * (ABS (matrix.xx) + ABS (matrix.yx)));
+  height = ceil (self->child_bounds.size.height * (ABS (matrix.xy) + ABS (matrix.yy)));
   surface = cairo_surface_create_similar (cairo_get_target (cr),
                                           CAIRO_CONTENT_COLOR_ALPHA,
-                                          ceilf (self->child_bounds.size.width),
-                                          ceilf (self->child_bounds.size.height));
+                                          width, height);
   cairo_surface_get_device_scale (surface, &scale_x, &scale_y);
+  scale_x *= width / self->child_bounds.size.width;
+  scale_y *= height / self->child_bounds.size.height;
+  cairo_surface_set_device_scale (surface, scale_x, scale_y);
   cairo_surface_set_device_offset (surface, 
                                    - self->child_bounds.origin.x * scale_x,
                                    - self->child_bounds.origin.y * scale_y);