Calculate Background Image Geometries using sub-pixel values

third_party/WebKit/Source/core/paint/NinePieceImagePainter.cpp

Index: third_party/WebKit/Source/core/paint/NinePieceImagePainter.cpp
diff --git a/third_party/WebKit/Source/core/paint/NinePieceImagePainter.cpp b/third_party/WebKit/Source/core/paint/NinePieceImagePainter.cpp
index 8947ad8aa4588e806d8daaaa9cdb8c51765c1589..05f985de196694e35739a16ef45c0d32d7e5b50c 100644
--- a/third_party/WebKit/Source/core/paint/NinePieceImagePainter.cpp
+++ b/third_party/WebKit/Source/core/paint/NinePieceImagePainter.cpp
@@ -48,14 +48,14 @@ bool NinePieceImagePainter::paint(GraphicsContext* graphicsContext, const Layout
     // doesn't have any understanding of the zoom that is in effect on the tile.
     LayoutRect rectWithOutsets = rect;
     rectWithOutsets.expand(style.imageOutsets(ninePieceImage));
-    IntRect borderImageRect = pixelSnappedIntRect(rectWithOutsets);
+    LayoutRect borderImageRect = rectWithOutsets;
 
-    IntSize imageSize = m_layoutObject.calculateImageIntrinsicDimensions(styleImage, borderImageRect.size(),
-        LayoutBoxModelObject::DoNotScaleByEffectiveZoom);
+    IntSize imageSize = roundedIntSize(m_layoutObject.calculateImageIntrinsicDimensions(styleImage, borderImageRect.size(),
+        LayoutBoxModelObject::DoNotScaleByEffectiveZoom));
 
     IntRectOutsets borderWidths(style.borderTopWidth(), style.borderRightWidth(),
         style.borderBottomWidth(), style.borderLeftWidth());
-    NinePieceImageGrid grid(ninePieceImage, imageSize, borderImageRect, borderWidths);
+    NinePieceImageGrid grid(ninePieceImage, imageSize, pixelSnappedIntRect(borderImageRect), borderWidths);

[davve, 2015/11/25 15:47:58]

One idea would be to propagate LayoutUnits down to NinePieceImageGrid too,
right?

I wonder what happens if I jump down this rabbit hole...

Move NinePieceImageGrid to LayoutUnit
https://codereview.chromium.org/1477813002/ (on top of this one)

Testing that I found bug 561519 so I made another CL on top of that:

Use LayoutUnit for SVG container size
https://codereview.chromium.org/1477433004/

 
     RefPtr<Image> image = styleImage->image(&m_layoutObject, imageSize, style.effectiveZoom());