1 /* 2 * Copyright (C) 2006, 2007, 2008 Apple Computer, Inc. All rights reserved. 3 * Copyright (C) 2008 Eric Seidel <eric (at) webkit.org> 4 * Copyright (C) 2013 Google, Inc. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 16 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 18 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 19 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 22 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 23 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 25 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include "config.h" 29 #include "core/platform/graphics/Pattern.h" 30 31 #include <v8.h> 32 #include "SkCanvas.h" 33 #include "SkColorShader.h" 34 #include "SkShader.h" 35 #include "core/platform/graphics/Image.h" 36 37 namespace WebCore { 38 39 Pattern::Pattern(PassRefPtr<Image> image, bool repeatX, bool repeatY) 40 : m_tileImage(image) 41 , m_repeatX(repeatX) 42 , m_repeatY(repeatY) 43 , m_externalMemoryAllocated(0) 44 { 45 ASSERT(m_tileImage); 46 } 47 48 Pattern::~Pattern() 49 { 50 if (m_externalMemoryAllocated) 51 v8::V8::AdjustAmountOfExternalAllocatedMemory(-m_externalMemoryAllocated); 52 } 53 54 SkShader* Pattern::shader() 55 { 56 if (m_pattern) 57 return m_pattern.get(); 58 59 RefPtr<NativeImageSkia> image = m_tileImage->nativeImageForCurrentFrame(); 60 // If we don't have a bitmap, return a transparent shader. 61 if (!image) 62 m_pattern = adoptRef(new SkColorShader(SK_ColorTRANSPARENT)); 63 else if (m_repeatX && m_repeatY) 64 m_pattern = adoptRef(SkShader::CreateBitmapShader(image->bitmap(), SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode)); 65 else { 66 // Skia does not have a "draw the tile only once" option. Clamp_TileMode 67 // repeats the last line of the image after drawing one tile. To avoid 68 // filling the space with arbitrary pixels, this workaround forces the 69 // image to have a line of transparent pixels on the "repeated" edge(s), 70 // thus causing extra space to be transparent filled. 71 SkShader::TileMode tileModeX = m_repeatX ? SkShader::kRepeat_TileMode : SkShader::kClamp_TileMode; 72 SkShader::TileMode tileModeY = m_repeatY ? SkShader::kRepeat_TileMode : SkShader::kClamp_TileMode; 73 int expandW = m_repeatX ? 0 : 1; 74 int expandH = m_repeatY ? 0 : 1; 75 76 // Create a transparent bitmap 1 pixel wider and/or taller than the 77 // original, then copy the orignal into it. 78 // FIXME: Is there a better way to pad (not scale) an image in skia? 79 SkBitmap bm2; 80 bm2.setConfig(image->bitmap().config(), image->bitmap().width() + expandW, image->bitmap().height() + expandH); 81 bm2.allocPixels(); 82 bm2.eraseARGB(0x00, 0x00, 0x00, 0x00); 83 SkCanvas canvas(bm2); 84 canvas.drawBitmap(image->bitmap(), 0, 0); 85 bm2.setImmutable(); 86 m_pattern = adoptRef(SkShader::CreateBitmapShader(bm2, tileModeX, tileModeY)); 87 88 // Clamp to int, since that's what the adjust function takes. 89 m_externalMemoryAllocated = static_cast<int>(std::min(static_cast<size_t>(INT_MAX), bm2.getSafeSize())); 90 v8::V8::AdjustAmountOfExternalAllocatedMemory(m_externalMemoryAllocated); 91 } 92 m_pattern->setLocalMatrix(m_patternSpaceTransformation); 93 return m_pattern.get(); 94 } 95 96 void Pattern::setPatternSpaceTransform(const AffineTransform& patternSpaceTransformation) 97 { 98 m_patternSpaceTransformation = patternSpaceTransformation; 99 if (m_pattern) 100 m_pattern->setLocalMatrix(m_patternSpaceTransformation); 101 } 102 103 } 104