Add a testcase for dpi changes

testsuite/gsk/compare/text-dpi-changes.node

@@ -0,0 +1,29 @@
+color {
+  bounds: -20 -70 100 100;
+  color: rgb(0,0,0);
+}
+text {
+  color: rgb(100,100,100);
+  font: "text-mixed-color-colrv1 15" url("data:font/ttf;base64,AAEAAAAKAIAAAwAgQ09MUhc9T40AAAI4AAAAe0NQQUwB/wATAAACtAAAABpjbWFwAHUAPQAAATgA\
+AAA0Z2x5Zn7NhtgAAAF8AAAAkGhlYWQmof0NAAAArAAAADZoaGVhDAEEAgAAAOQAAAAkaG10eAQA\
+AAAAAAEoAAAAEGxvY2EAbACQAAABbAAAABBtYXhwAAkABQAAAQgAAAAgbmFtZR9CFpQAAAIMAAAA\
+KQABAAAAARmaAQnTZV8PPPUAAggAAAAAAOHCPQAAAAAA4cpZfQAAAAAEAAgAAAAAAQACAAAAAAAA\
+AAEAAAgAAAAAAAQAAAAAAAQAAAEAAAAAAAAAAAAAAAAAAAABAAEAAAAHAAQAAQAAAAAAAQAAAAAA\
+AAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAAAAAAAAAAQAAAAMAAAAMAAQAKAAAAAYABAABAAIAIABG\
+//8AAAAgAEH////g/8AAAQAAAAAAAAAAAAAADAAYACQAMAA8AEgAAQAAAAAEAAgAAAMAADEhESEE\
+APwACAAAAQAAAAAEAAgAAAMAADEhESEEAPwACAAAAQAAAAAEAAgAAAMAADEhESEEAPwACAAAAQAA\
+AAAEAAgAAAMAADEhESEEAPwACAAAAQAAAAAEAAgAAAMAADEhESEEAPwACAAAAQAAAAAEAAgAAAMA\
+ADEhESEEAPwACAAAAAABABIAAQAAAAAAAQAXAAB0ZXh0LW1peGVkLWNvbG9yLWNvbHJ2MQAAAAAB\
+AAAAAAAAAAAAAAAAAAAAIgAAAEoAAAAAAAAAAAAAAAAAAAADAAQAAAAWAAUAAAAcAAYAAAAiAQEA\
+AAAAAQEAAAABAQEAAAACAAAAAwAAABAAAAAbAAAAJgoAAAYAAQIAAEAACgAABgACAgABQAAKAAAG\
+AAMCAAJAAAAAAAADAAEAAwAAAA4AAAAA//8A/wD//wAA/wAA\
+");
+  glyphs: 1 20;
+}
+text {
+  color: rgb(100,100,100);
+  font: "text-mixed-color-colrv1 15";
+  glyphs: 1 40;
+  offset: 20 0;
+  dpi: 192;
+}

testsuite/gsk/meson.build

@@ -146,6 +146,7 @@ compare_render_tests = [
   'subpixel-positioning',
   'subpixel-positioning-hidpi-nogl-nocairo',
   'text-color-mix',
+  'text-dpi-changes',
   'text-glyph-lsb',
   'text-mixed-color-nocairo',
   'text-mixed-color-colrv1',