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| 1 // Copyright 2015 The Chromium Authors. All rights reserved. | |
| 2 // | |
| 3 // The Chromium Authors can be found at | |
| 4 // http://src.chromium.org/svn/trunk/src/AUTHORS | |
| 5 // | |
| 6 // Redistribution and use in source and binary forms, with or without | |
| 7 // modification, are permitted provided that the following conditions are | |
| 8 // met: | |
| 9 // | |
| 10 // * Redistributions of source code must retain the above copyright | |
| 11 // notice, this list of conditions and the following disclaimer. | |
| 12 // * Redistributions in binary form must reproduce the above | |
| 13 // copyright notice, this list of conditions and the following disclaimer | |
| 14 // in the documentation and/or other materials provided with the | |
| 15 // distribution. | |
| 16 // * Neither the name of Google Inc. nor the names of its | |
| 17 // contributors may be used to endorse or promote products derived from | |
| 18 // this software without specific prior written permission. | |
| 19 // | |
| 20 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 21 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 22 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 23 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
| 24 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 25 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| 26 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 27 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 28 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 29 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 30 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 31 | |
| 32 #include "config.h" | |
| 33 #include "platform/graphics/GraphicsContextClient.h" | |
| 34 | |
| 35 #include "platform/graphics/GraphicsContext.h" | |
| 36 #include "third_party/skia/include/core/SkCanvas.h" | |
| 37 #include "third_party/skia/include/core/SkShader.h" | |
| 38 | |
| 39 namespace blink { | |
| 40 | |
| 41 void GraphicsContextClient::willDrawRect(GraphicsContext* context, const SkRect&
rect, const SkPaint* paint, ImageType imageType, DrawType drawType) | |
| 42 { | |
| 43 if (context->isDrawingToLayer()) | |
| 44 return; | |
| 45 | |
| 46 SkRect deviceRect; | |
| 47 if (drawType == UntransformedUnclippedFill) { | |
| 48 deviceRect = rect; | |
| 49 } else { | |
| 50 // FIXME: Early out if rotate/skew. To be thorough, we could compute | |
| 51 // an enclsed rect, but that would probably be overkill. | |
| 52 const SkMatrix& ctm = context->getTotalMatrix(); | |
| 53 if (!ctm.rectStaysRect()) | |
| 54 return; | |
| 55 | |
| 56 if (context->hasComplexClip()) | |
| 57 return; | |
| 58 | |
| 59 ctm.mapRect(&deviceRect, rect); | |
| 60 SkIRect skIBounds; | |
| 61 if (!context->canvas()->getClipDeviceBounds(&skIBounds)) | |
| 62 return; | |
| 63 SkRect skBounds = SkRect::Make(skIBounds); | |
| 64 if (!deviceRect.intersect(skBounds)) | |
| 65 return; | |
| 66 } | |
| 67 | |
| 68 const SkImageInfo& imageInfo = context->canvas()->imageInfo(); | |
| 69 if (!deviceRect.contains(SkRect::MakeWH(imageInfo.width(), imageInfo.height(
)))) | |
| 70 return; | |
| 71 | |
| 72 bool isSourceOver = true; | |
| 73 unsigned alpha = 0xFF; | |
| 74 if (paint) { | |
| 75 if (drawType == FillOrStroke && paint->getStyle() == SkPaint::kStroke_St
yle) | |
| 76 return; | |
| 77 if (paint->getLooper() || paint->getImageFilter() || paint->getMaskFilte
r()) | |
| 78 return; | |
| 79 | |
| 80 SkXfermode* xfermode = paint->getXfermode(); | |
| 81 if (xfermode) { | |
| 82 SkXfermode::Mode mode; | |
| 83 if (xfermode->asMode(&mode)) { | |
| 84 isSourceOver = mode == SkXfermode::kSrcOver_Mode; | |
| 85 if (!isSourceOver && mode != SkXfermode::kSrc_Mode && mode != Sk
Xfermode::kClear_Mode) | |
| 86 return; // The code below only knows how to handle Src, SrcO
ver, and Clear | |
| 87 } else { | |
| 88 // unknown xfermode | |
| 89 return; | |
| 90 } | |
| 91 } | |
| 92 | |
| 93 if (isSourceOver) { | |
| 94 // With source over, we need to certify that alpha == 0xFF for all p
ixels | |
| 95 SkColorFilter* colorFilter = paint->getColorFilter(); | |
| 96 if (colorFilter && !(colorFilter->getFlags() & SkColorFilter::kAlpha
Unchanged_Flag)) | |
| 97 return; | |
| 98 | |
| 99 SkShader* shader = paint->getShader(); | |
| 100 if (shader) { | |
| 101 // Shader overrides bitmap and paint color, so we can end here | |
| 102 if (shader->isOpaque()) | |
| 103 willOverwriteCanvas(); | |
| 104 return; | |
| 105 } | |
| 106 } | |
| 107 | |
| 108 alpha = paint->getAlpha(); | |
| 109 } | |
| 110 | |
| 111 if (isSourceOver) { | |
| 112 // With source over, we need to certify that alpha == 0xFF for all pixel
s | |
| 113 if (imageType == NonOpaqueImage) | |
| 114 return; | |
| 115 if (imageType == NoImage && alpha < 0xFF) | |
| 116 return; | |
| 117 } | |
| 118 | |
| 119 willOverwriteCanvas(); | |
| 120 } | |
| 121 | |
| 122 } // blink | |
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Chromium Code Reviews
Issue 907453003:
Move overdraw tracking code from GraphicsContext to CanvasRenderingContext2D (Closed)
Base URL: svn://svn.chromium.org/blink/trunk