Calculate Background Image Geometries using sub-pixel values

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

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/paint/NinePieceImagePainter.h"
 
 #include "core/frame/UseCounter.h"
 #include "core/layout/ImageQualityController.h"
 #include "core/layout/LayoutBoxModelObject.h"
@@ skipping 30 matching lines @@
     if ((style.borderLeftWidth() && (style.borderLeft().style() == BNONE || style.borderLeft().style() == BHIDDEN))
         || (style.borderRightWidth() && (style.borderRight().style() == BNONE || style.borderRight().style() == BHIDDEN))
         || (style.borderTopWidth() && (style.borderTop().style() == BNONE || style.borderTop().style() == BHIDDEN))
         || (style.borderBottomWidth() && (style.borderBottom().style() == BNONE || style.borderBottom().style() == BHIDDEN)))
         UseCounter::count(m_layoutObject.document(), UseCounter::BorderImageWithBorderStyleNone);
 
     // FIXME: border-image is broken with full page zooming when tiling has to happen, since the tiling function
     // 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);
 
     RefPtr<Image> image = styleImage->image(&m_layoutObject, imageSize, style.effectiveZoom());
 
     InterpolationQuality interpolationQuality = BoxPainter::chooseInterpolationQuality(m_layoutObject,
         graphicsContext, image.get(), 0, rectWithOutsets.size());
     InterpolationQuality previousInterpolationQuality = graphicsContext->imageInterpolationQuality();
     graphicsContext->setImageInterpolationQuality(interpolationQuality);
 
     TRACE_EVENT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline"), "PaintImage", "data",
         InspectorPaintImageEvent::data(m_layoutObject, *styleImage));
@@ skipping 10 matching lines @@
                     drawInfo.tileRule.vertical, op);
             }
         }
     }
 
     graphicsContext->setImageInterpolationQuality(previousInterpolationQuality);
     return true;
 }
 
 } // namespace blink