src/third_party/WebKit/Source/core/paint/SVGImagePainter.cpp

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "config.h"
   6 #include "core/paint/SVGImagePainter.h"
   7
   8 #include "core/paint/ObjectPainter.h"
   9 #include "core/rendering/GraphicsContextAnnotator.h"
  10 #include "core/rendering/ImageQualityController.h"
  11 #include "core/rendering/PaintInfo.h"
  12 #include "core/rendering/RenderImageResource.h"
  13 #include "core/rendering/svg/RenderSVGImage.h"
  14 #include "core/rendering/svg/SVGRenderSupport.h"
  15 #include "core/rendering/svg/SVGRenderingContext.h"
  16 #include "core/svg/SVGImageElement.h"
  17 #include "platform/graphics/DisplayList.h"
  18 #include "platform/graphics/GraphicsContext.h"
  19 #include "platform/graphics/GraphicsContextStateSaver.h"
  20
  21 namespace blink {
  22
  23 void SVGImagePainter::paint(PaintInfo& paintInfo)
  24 {
  25     ANNOTATE_GRAPHICS_CONTEXT(paintInfo, &m_renderSVGImage);
  26
  27     if (paintInfo.phase != PaintPhaseForeground
  28         || m_renderSVGImage.style()->visibility() == HIDDEN
  29         || !m_renderSVGImage.imageResource()->hasImage())
  30         return;
  31
  32     FloatRect invalBox = m_renderSVGImage.paintInvalidationRectInLocalCoordinates();
  33     if (!SVGRenderSupport::paintInfoIntersectsPaintInvalidationRect(invalBox, m_renderSVGImage.localToParentTransform(), paintInfo))
  34         return;
  35
  36     PaintInfo childPaintInfo(paintInfo);
  37     GraphicsContextStateSaver stateSaver(*childPaintInfo.context, false);
  38
  39     childPaintInfo.applyTransform(m_renderSVGImage.localToParentTransform(), &stateSaver);
  40
  41     FloatRect boundingBox = m_renderSVGImage.objectBoundingBox();
  42     if (!boundingBox.isEmpty()) {
  43         // SVGRenderingContext may taint the state - make sure we're always saving.
  44         stateSaver.saveIfNeeded();
  45
  46         SVGRenderingContext renderingContext(&m_renderSVGImage, childPaintInfo);
  47         if (renderingContext.isRenderingPrepared()) {
  48             if (m_renderSVGImage.style()->svgStyle().bufferedRendering() != BR_STATIC) {
  49                 paintForeground(childPaintInfo);
  50             } else {
  51                 RefPtr<DisplayList>& bufferedForeground = m_renderSVGImage.bufferedForeground();
  52                 if (!bufferedForeground) {
  53                     childPaintInfo.context->beginRecording(boundingBox);
  54                     paintForeground(childPaintInfo);
  55                     bufferedForeground = childPaintInfo.context->endRecording();
  56                 }
  57
  58                 childPaintInfo.context->drawDisplayList(bufferedForeground.get());
  59             }
  60         }
  61     }
  62
  63     if (m_renderSVGImage.style()->outlineWidth())
  64         ObjectPainter(m_renderSVGImage).paintOutline(childPaintInfo, IntRect(invalBox));
  65 }
  66
  67 void SVGImagePainter::paintForeground(PaintInfo& paintInfo)
  68 {
  69     RefPtr<Image> image = m_renderSVGImage.imageResource()->image();
  70     FloatRect destRect = m_renderSVGImage.objectBoundingBox();
  71     FloatRect srcRect(0, 0, image->width(), image->height());
  72
  73     SVGImageElement* imageElement = toSVGImageElement(m_renderSVGImage.element());
  74     imageElement->preserveAspectRatio()->currentValue()->transformRect(destRect, srcRect);
  75
  76     InterpolationQuality interpolationQuality = InterpolationDefault;
  77     if (m_renderSVGImage.style()->svgStyle().bufferedRendering() != BR_STATIC)
  78         interpolationQuality = ImageQualityController::imageQualityController()->chooseInterpolationQuality(paintInfo.context, &m_renderSVGImage, image.get(), image.get(), LayoutSize(destRect.size()));
  79
  80     InterpolationQuality previousInterpolationQuality = paintInfo.context->imageInterpolationQuality();
  81     paintInfo.context->setImageInterpolationQuality(interpolationQuality);
  82     paintInfo.context->drawImage(image.get(), destRect, srcRect, CompositeSourceOver);
  83     paintInfo.context->setImageInterpolationQuality(previousInterpolationQuality);
  84 }
  85
  86 } // namespace blink