Rounded background image fast path

third_party/WebKit/Source/platform/graphics/GraphicsContext.cpp

 /*
  * Copyright (C) 2003, 2004, 2005, 2006, 2009 Apple Inc. All rights reserved.
  * 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY 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 "platform/graphics/GraphicsContext.h"
 
 #include "platform/TraceEvent.h"
+#include "platform/geometry/FloatRect.h"
+#include "platform/geometry/FloatRoundedRect.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/graphics/ColorSpace.h"
 #include "platform/graphics/Gradient.h"
 #include "platform/graphics/GraphicsContextStateSaver.h"
 #include "platform/graphics/ImageBuffer.h"
 #include "platform/graphics/Path.h"
 #include "platform/graphics/paint/PaintController.h"
 #include "platform/weborigin/KURL.h"
 #include "skia/ext/platform_canvas.h"
 #include "third_party/skia/include/core/SkAnnotation.h"
@@ skipping 762 matching lines @@
 
     SkPaint imagePaint = immutableState()->fillPaint();
     imagePaint.setXfermodeMode(op);
     imagePaint.setColor(SK_ColorBLACK);
     imagePaint.setFilterQuality(computeFilterQuality(image, dest, src));
     imagePaint.setAntiAlias(shouldAntialias());
     image->draw(m_canvas, imagePaint, dest, src, shouldRespectImageOrientation, Image::ClampImageToSourceRect);
     m_paintController.setImagePainted();
 }
 
+void GraphicsContext::drawImageRRect(Image* image, const FloatRoundedRect& dest,
+    const FloatRect* srcPtr, SkXfermode::Mode op, RespectImageOrientationEnum respectOrientation)
+{
+    if (contextDisabled() || !image)
+        return;
+
+    if (!dest.isRounded() || !dest.isRenderable()) {

[chrishtr, 2016/05/20 15:44:13]

should isRenderable() be considered illegal?

[f(malita), 2016/05/20 19:17:11]

Done.

+        drawImage(image, dest.rect(), srcPtr, op, respectOrientation);
+        return;
+    }
+
+    const FloatRect src = srcPtr ? *srcPtr : image->rect();
+    const FloatRect visibleSrc = intersection(src, image->rect());
+    if (dest.isEmpty() || visibleSrc.isEmpty())
+        return;
+
+    SkPaint imagePaint = immutableState()->fillPaint();
+    imagePaint.setXfermodeMode(op);
+    imagePaint.setColor(SK_ColorBLACK);
+    imagePaint.setFilterQuality(computeFilterQuality(image, dest.rect(), src));
+    imagePaint.setAntiAlias(shouldAntialias());
+
+    bool useShader = (visibleSrc == src) && (respectOrientation == DoNotRespectImageOrientation);
+    if (useShader) {
+        const SkMatrix localMatrix =
+            SkMatrix::MakeRectToRect(visibleSrc, dest.rect(), SkMatrix::kFill_ScaleToFit);
+        useShader = image->applyShader(imagePaint, localMatrix.isIdentity() ? nullptr : &localMatrix);
+    }
+
+    if (useShader) {
+        // Shader-based fast path.
+        m_canvas->drawRRect(dest, imagePaint);
+    } else {
+        // Clip-based fallback.
+        SkAutoCanvasRestore autoRestore(m_canvas, true);
+        m_canvas->clipRRect(dest, SkRegion::kIntersect_Op, imagePaint.isAntiAlias());
+        image->draw(m_canvas, imagePaint, dest.rect(), src, respectOrientation, Image::ClampImageToSourceRect);
+    }
+
+    m_paintController.setImagePainted();
+}
+
 SkFilterQuality GraphicsContext::computeFilterQuality(Image* image, const FloatRect& dest, const FloatRect& src) const
 {
     InterpolationQuality resampling;
     if (printing()) {
         resampling = InterpolationNone;
     } else if (image->currentFrameIsLazyDecoded()) {
         resampling = InterpolationHigh;
     } else {
         resampling = computeInterpolationQuality(
             SkScalarToFloat(src.width()), SkScalarToFloat(src.height()),
@@ skipping 532 matching lines @@
     static const SkPMColor colors[] = {
         SkPreMultiplyARGB(0x60, 0xFF, 0x00, 0x00), // More transparent red
         SkPreMultiplyARGB(0x60, 0xC0, 0xC0, 0xC0)  // More transparent gray
     };
 
     return colors[index];
 }
 #endif
 
 } // namespace blink