Bug 691646 - Pattern tile pixelated on patternTransform. r=dholbert

layout/reftests/svg/pattern-scale-01-ref.svg

@@ -0,0 +1,13 @@
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<svg xmlns="http://www.w3.org/2000/svg">
+  <defs>
+    <pattern id="pattern" width="200" height="200" patternUnits="userSpaceOnUse">
+      <circle cx="100" cy="100" r="100" fill="lime" />
+    </pattern>
+  </defs>
+  <rect width="200" height="200" fill="url(#pattern)" />
+  <circle cx="100" cy="100" r="100" fill="none" stroke="lime" stroke-width="2" shape-rendering="crispEdges" />
+</svg>

layout/reftests/svg/pattern-scale-01.svg

@@ -0,0 +1,13 @@
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<svg xmlns="http://www.w3.org/2000/svg">
+  <defs>
+    <pattern id="pattern" width="5" height="5" patternUnits="userSpaceOnUse" patternTransform="scale(-40)">
+      <circle cx="2.5" cy="2.5" r="2.5" fill="lime" />
+    </pattern>
+  </defs>
+  <rect width="200" height="200" fill="url(#pattern)" />
+  <circle cx="100" cy="100" r="100" fill="none" stroke="lime" stroke-width="2" shape-rendering="crispEdges" />
+</svg>

layout/reftests/svg/reftest.list

@@ -176,6 +176,7 @@ fails-if(Android&&layersOpenGL) == path-04.svg pass.svg
 == pattern-live-01a.svg pattern-live-01-ref.svg
 == pattern-live-01b.svg pattern-live-01-ref.svg
 == pattern-live-01c.svg pattern-live-01-ref.svg
+== pattern-scale-01.svg pattern-scale-01-ref.svg
 == pattern-transform-presence-01.svg pattern-transform-presence-01-ref.svg
 == polygon-marker-01.svg pass.svg
 == polygon-points-negative-01.svg pass.svg

layout/svg/base/src/nsSVGPatternFrame.cpp

@@ -261,8 +261,10 @@ nsSVGPatternFrame::PaintPattern(gfxASurface** surface,
 
   bool resultOverflows;
   gfxIntSize surfaceSize =
-    nsSVGUtils::ConvertToSurfaceSize(gfxSize(patternWidth, patternHeight),
-                                     &resultOverflows);
+    nsSVGUtils::ConvertToSurfaceSize(
+      gfxSize(patternWidth * fabs(patternMatrix->xx),
+              patternHeight * fabs(patternMatrix->yy)),
+      &resultOverflows);
 
   // 0 disables rendering, < 0 is an error
   if (surfaceSize.width <= 0 || surfaceSize.height <= 0)