Use refs for GraphicsContext

third_party/WebKit/Source/core/layout/ImageQualityController.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 15 matching lines @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/layout/ImageQualityController.h"
 
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
-#include "platform/graphics/GraphicsContext.h"
 
 namespace blink {
 
 static const double cLowQualityTimeThreshold = 0.500; // 500 ms
 
 static ImageQualityController* gImageQualityController = nullptr;
 
 ImageQualityController* ImageQualityController::imageQualityController()
 {
     if (!gImageQualityController)
         gImageQualityController = new ImageQualityController;
 
     return gImageQualityController;
 }
 
-void ImageQualityController::remove(LayoutObject* layoutObject)
+void ImageQualityController::remove(LayoutObject& layoutObject)
 {
     if (gImageQualityController) {
         gImageQualityController->objectDestroyed(layoutObject);
         if (gImageQualityController->isEmpty()) {
             delete gImageQualityController;
             gImageQualityController = nullptr;
         }
     }
 }
 
-bool ImageQualityController::has(const LayoutObject* layoutObject)
+bool ImageQualityController::has(const LayoutObject& layoutObject)
 {
-    return gImageQualityController && gImageQualityController->m_objectLayerSizeMap.contains(layoutObject);
+    return gImageQualityController && gImageQualityController->m_objectLayerSizeMap.contains(&layoutObject);
 }
 
-InterpolationQuality ImageQualityController::chooseInterpolationQuality(GraphicsContext* context, const LayoutObject* object, Image* image, const void* layer, const LayoutSize& layoutSize)
+InterpolationQuality ImageQualityController::chooseInterpolationQuality(const LayoutObject& object, Image* image, const void* layer, const LayoutSize& layoutSize)
 {
-    if (object->style()->imageRendering() == ImageRenderingPixelated)
+    if (object.style()->imageRendering() == ImageRenderingPixelated)
         return InterpolationNone;
 
     if (InterpolationDefault == InterpolationLow)
         return InterpolationLow;
 
-    if (shouldPaintAtLowQuality(context, object, image, layer, layoutSize))
+    if (shouldPaintAtLowQuality(object, image, layer, layoutSize))
         return InterpolationLow;
 
     // For images that are potentially animated we paint them at medium quality.
     if (image && image->maybeAnimated())
         return InterpolationMedium;
 
     return InterpolationDefault;
 }
 
 ImageQualityController::~ImageQualityController()
 {
     // This will catch users of ImageQualityController that forget to call cleanUp.
     ASSERT(!gImageQualityController || gImageQualityController->isEmpty());
 }
 
 ImageQualityController::ImageQualityController()
     : m_timer(adoptPtr(new Timer<ImageQualityController>(this, &ImageQualityController::highQualityRepaintTimerFired)))
     , m_animatedResizeIsActive(false)
     , m_liveResizeOptimizationIsActive(false)
 {
 }
 
 void ImageQualityController::setTimer(Timer<ImageQualityController>* newTimer)
 {
     m_timer = adoptPtr(newTimer);
 }
 
-void ImageQualityController::removeLayer(const LayoutObject* object, LayerSizeMap* innerMap, const void* layer)
+void ImageQualityController::removeLayer(const LayoutObject& object, LayerSizeMap* innerMap, const void* layer)
 {
     if (innerMap) {
         innerMap->remove(layer);
         if (innerMap->isEmpty())
             objectDestroyed(object);
     }
 }
 
-void ImageQualityController::set(const LayoutObject* object, LayerSizeMap* innerMap, const void* layer, const LayoutSize& size)
+void ImageQualityController::set(const LayoutObject& object, LayerSizeMap* innerMap, const void* layer, const LayoutSize& size)
 {
     if (innerMap) {
         innerMap->set(layer, size);
     } else {
         LayerSizeMap newInnerMap;
         newInnerMap.set(layer, size);
-        m_objectLayerSizeMap.set(object, newInnerMap);
+        m_objectLayerSizeMap.set(&object, newInnerMap);
     }
 }
 
-void ImageQualityController::objectDestroyed(const LayoutObject* object)
+void ImageQualityController::objectDestroyed(const LayoutObject& object)
 {
-    m_objectLayerSizeMap.remove(object);
+    m_objectLayerSizeMap.remove(&object);
     if (m_objectLayerSizeMap.isEmpty()) {
         m_animatedResizeIsActive = false;
         m_timer->stop();
     }
 }
 
 void ImageQualityController::highQualityRepaintTimerFired(Timer<ImageQualityController>*)
 {
     if (!m_animatedResizeIsActive && !m_liveResizeOptimizationIsActive)
         return;
@@ skipping 12 matching lines @@
     }
 
     m_liveResizeOptimizationIsActive = false;
 }
 
 void ImageQualityController::restartTimer()
 {
     m_timer->startOneShot(cLowQualityTimeThreshold, BLINK_FROM_HERE);
 }
 
-bool ImageQualityController::shouldPaintAtLowQuality(GraphicsContext* context, const LayoutObject* object, Image* image, const void *layer, const LayoutSize& layoutSize)
+bool ImageQualityController::shouldPaintAtLowQuality(const LayoutObject& object, Image* image, const void *layer, const LayoutSize& layoutSize)
 {
     // If the image is not a bitmap image, then none of this is relevant and we just paint at high
     // quality.
     if (!image || !image->isBitmapImage())
         return false;
 
     if (!layer)
         return false;
 
-    if (object->style()->imageRendering() == ImageRenderingOptimizeContrast)
+    if (object.style()->imageRendering() == ImageRenderingOptimizeContrast)
         return true;
 
     // Look ourselves up in the hashtables.
-    ObjectLayerSizeMap::iterator i = m_objectLayerSizeMap.find(object);
+    ObjectLayerSizeMap::iterator i = m_objectLayerSizeMap.find(&object);
     LayerSizeMap* innerMap = i != m_objectLayerSizeMap.end() ? &i->value : 0;
     LayoutSize oldSize;
     bool isFirstResize = true;
     if (innerMap) {
         LayerSizeMap::iterator j = innerMap->find(layer);
         if (j != innerMap->end()) {
             isFirstResize = false;
             oldSize = j->value;
         }
     }
 
     // If the containing FrameView is being resized, paint at low quality until resizing is finished.
-    if (LocalFrame* frame = object->document().frame()) {
+    if (LocalFrame* frame = object.document().frame()) {
         bool frameViewIsCurrentlyInLiveResize = frame->view() && frame->view()->inLiveResize();
         if (frameViewIsCurrentlyInLiveResize) {
             set(object, innerMap, layer, layoutSize);
             restartTimer();
             m_liveResizeOptimizationIsActive = true;
             return true;
         }
         if (m_liveResizeOptimizationIsActive) {
             // Live resize has ended, paint in HQ and remove this object from the list.
             removeLayer(object, innerMap, layer);
@@ skipping 32 matching lines @@
     // This object has been resized to two different sizes while the timer
     // is active, so draw at low quality, set the flag for animated resizes and
     // the object to the list for high quality redraw.
     set(object, innerMap, layer, layoutSize);
     m_animatedResizeIsActive = true;
     restartTimer();
     return true;
 }
 
 } // namespace blink