globalCompositeOperation is ignored in strokeText, fillText.

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 2207 matching lines @@
 
     // The slop built in to this mask rect matches the heuristic used in FontCGWin.cpp for GDI text.
     TextRunPaintInfo textRunPaintInfo(textRun);
     textRunPaintInfo.bounds = FloatRect(location.x() - fontMetrics.height() / 2,
                                         location.y() - fontMetrics.ascent() - fontMetrics.lineGap(),
                                         width + fontMetrics.height(),
                                         fontMetrics.lineSpacing());
     if (!fill)
         inflateStrokeRect(textRunPaintInfo.bounds);
 
-    FloatRect dirtyRect;
-    if (!computeDirtyRect(textRunPaintInfo.bounds, &dirtyRect))
-        return;
+    c->setTextDrawingMode(fill ? TextModeFill : TextModeStroke);
 
-    c->setTextDrawingMode(fill ? TextModeFill : TextModeStroke);
+    GraphicsContextStateSaver stateSaver(*c);
     if (useMaxWidth) {
-        GraphicsContextStateSaver stateSaver(*c);
         c->translate(location.x(), location.y());
         // We draw when fontWidth is 0 so compositing operations (eg, a "copy" op) still work.
         c->scale(FloatSize((fontWidth > 0 ? (width / fontWidth) : 0), 1));
-        c->drawBidiText(font, textRunPaintInfo, FloatPoint(0, 0), Font::UseFallbackIfFontNotReady);
-    } else
+        location = FloatPoint();
+    }
+
+    FloatRect clipBounds;
+    if (!c->getTransformedClipBounds(&clipBounds)) {
+        return;
+    }
+
+    if (isFullCanvasCompositeMode(state().m_globalComposite)) {
+        c->beginLayer(1, state().m_globalComposite);
+        CompositeOperator previousOperator = c->compositeOperation();
+        c->setCompositeOperation(CompositeSourceOver);
         c->drawBidiText(font, textRunPaintInfo, location, Font::UseFallbackIfFontNotReady);
-
-    didDraw(dirtyRect);
+        c->setCompositeOperation(previousOperator);
+        c->endLayer();
+        didDraw(clipBounds);
+    } else if (state().m_globalComposite == CompositeCopy) {
+        clearCanvas();
+        c->drawBidiText(font, textRunPaintInfo, location, Font::UseFallbackIfFontNotReady);
+        didDraw(clipBounds);
+    } else {
+        FloatRect dirtyRect;
+        if (computeDirtyRect(textRunPaintInfo.bounds, clipBounds, &dirtyRect)) {
+            c->drawBidiText(font, textRunPaintInfo, location, Font::UseFallbackIfFontNotReady);
+            didDraw(dirtyRect);
+        }
+    }
 }
 
 void CanvasRenderingContext2D::inflateStrokeRect(FloatRect& rect) const
 {
     // Fast approximation of the stroke's bounding rect.
     // This yields a slightly oversized rect but is very fast
     // compared to Path::strokeBoundingRect().
     static const float root2 = sqrtf(2);
     float delta = state().m_lineWidth / 2;
     if (state().m_lineJoin == MiterJoin)
@@ skipping 158 matching lines @@
     c->setAlphaAsFloat(1.0);
     c->clearShadow();
     c->setCompositeOperation(CompositeSourceOver, blink::WebBlendModeNormal);
     c->drawFocusRing(path, focusRingWidth, focusRingOutline, focusRingColor);
     c->restore();
 
     didDraw(dirtyRect);
 }
 
 } // namespace WebCore