2D canvas: fix shadow rendering with "copy" compositing mode.

Source/core/html/canvas/CanvasRenderingContext2D.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008 Dirk Schulze <krit@webkit.org>
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
  * Copyright (C) 2012, 2013 Intel Corporation. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
  *
@@ skipping 1015 matching lines @@
     }
 
     WindRule windRule = c->fillRule();
     c->setFillRule(parseWinding(windingRuleString));
 
     if (isFullCanvasCompositeMode(state().m_globalComposite)) {
         fullCanvasCompositedDraw(bind(&GraphicsContext::fillPath, c, path));
         didDraw(clipBounds);
     } else if (state().m_globalComposite == CompositeCopy) {
         clearCanvas();
+        c->clearShadow();
         c->fillPath(path);
+        applyShadow(DrawShadowAndForeground);
         didDraw(clipBounds);
     } else {
         FloatRect dirtyRect;
         if (computeDirtyRect(path.boundingRect(), clipBounds, &dirtyRect)) {
             c->fillPath(path);
             didDraw(dirtyRect);
         }
     }
 
     c->setFillRule(windRule);
@@ skipping 29 matching lines @@
     Gradient* gradient = c->strokeGradient();
     if (gradient && gradient->isZeroSize()) {
         return;
     }
 
     if (isFullCanvasCompositeMode(state().m_globalComposite)) {
         fullCanvasCompositedDraw(bind(&GraphicsContext::strokePath, c, path));
         didDraw(clipBounds);
     } else if (state().m_globalComposite == CompositeCopy) {
         clearCanvas();
+        c->clearShadow();
         c->strokePath(path);
+        applyShadow(DrawShadowAndForeground);
         didDraw(clipBounds);
     } else {
         FloatRect bounds = path.boundingRect();
         inflateStrokeRect(bounds);
         FloatRect dirtyRect;
         if (computeDirtyRect(bounds, clipBounds, &dirtyRect)) {
             c->strokePath(path);
             didDraw(dirtyRect);
         }
     }
@@ skipping 209 matching lines @@
 
     FloatRect rect(x, y, width, height);
     if (rectContainsTransformedRect(rect, clipBounds)) {
         c->fillRect(rect);
         didDraw(clipBounds);
     } else if (isFullCanvasCompositeMode(state().m_globalComposite)) {
         fullCanvasCompositedDraw(bind(&fillRectOnContext, c, rect));
         didDraw(clipBounds);
     } else if (state().m_globalComposite == CompositeCopy) {
         clearCanvas();
+        c->clearShadow();
         c->fillRect(rect);
+        applyShadow(DrawShadowAndForeground);
         didDraw(clipBounds);
     } else {
         FloatRect dirtyRect;
         if (computeDirtyRect(rect, clipBounds, &dirtyRect)) {
             c->fillRect(rect);
             didDraw(dirtyRect);
         }
     }
 }
 
@@ skipping 18 matching lines @@
     Gradient* gradient = c->strokeGradient();
     if (gradient && gradient->isZeroSize())
         return;
 
     FloatRect rect(x, y, width, height);
     if (isFullCanvasCompositeMode(state().m_globalComposite)) {
         fullCanvasCompositedDraw(bind(&strokeRectOnContext, c, rect));
         didDraw(clipBounds);
     } else if (state().m_globalComposite == CompositeCopy) {
         clearCanvas();
+        c->clearShadow();
         c->strokeRect(rect);
+        applyShadow(DrawShadowAndForeground);
         didDraw(clipBounds);
     } else {
         FloatRect boundingRect = rect;
         boundingRect.inflate(state().m_lineWidth / 2);
         FloatRect dirtyRect;
         if (computeDirtyRect(boundingRect, clipBounds, &dirtyRect)) {
             c->strokeRect(rect);
             didDraw(dirtyRect);
         }
     }
@@ skipping 839 matching lines @@
     FloatRect clipBounds;
     if (!c->getTransformedClipBounds(&clipBounds)) {
         return;
     }
 
     if (isFullCanvasCompositeMode(state().m_globalComposite)) {
         fullCanvasCompositedDraw(bind(&GraphicsContext::drawBidiText, c, font, textRunPaintInfo, location, Font::UseFallbackIfFontNotReady));
         didDraw(clipBounds);
     } else if (state().m_globalComposite == CompositeCopy) {
         clearCanvas();
+        c->clearShadow();
         c->drawBidiText(font, textRunPaintInfo, location, Font::UseFallbackIfFontNotReady);
+        applyShadow(DrawShadowAndForeground);
         didDraw(clipBounds);
     } else {
         FloatRect dirtyRect;
         if (computeDirtyRect(textRunPaintInfo.bounds, clipBounds, &dirtyRect)) {
             c->drawBidiText(font, textRunPaintInfo, location, Font::UseFallbackIfFontNotReady);
             didDraw(dirtyRect);
         }
     }
 }
 
@@ skipping 205 matching lines @@
 
 unsigned CanvasRenderingContext2D::hitRegionsCount() const
 {
     if (m_hitRegionManager)
         return m_hitRegionManager->getHitRegionsCount();
 
     return 0;
 }
 
 } // namespace blink