skia_util.cc revision 2a99a7e74a7f215066514fe81d2bfa6639d9eddd
1// Copyright (c) 2012 The Chromium Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4 5#include "ui/gfx/skia_util.h" 6 7#include "third_party/skia/include/core/SkBitmap.h" 8#include "third_party/skia/include/core/SkColorFilter.h" 9#include "third_party/skia/include/core/SkColorPriv.h" 10#include "third_party/skia/include/core/SkUnPreMultiply.h" 11#include "third_party/skia/include/effects/SkBlurMaskFilter.h" 12#include "third_party/skia/include/effects/SkGradientShader.h" 13#include "third_party/skia/include/effects/SkLayerDrawLooper.h" 14#include "ui/gfx/image/image_skia_rep.h" 15#include "ui/gfx/rect.h" 16#include "ui/gfx/rect_f.h" 17#include "ui/gfx/shadow_value.h" 18 19namespace gfx { 20 21SkRect RectToSkRect(const Rect& rect) { 22 SkRect r; 23 r.iset(rect.x(), rect.y(), rect.right(), rect.bottom()); 24 return r; 25} 26 27SkIRect RectToSkIRect(const Rect& rect) { 28 return SkIRect::MakeXYWH(rect.x(), rect.y(), rect.width(), rect.height()); 29} 30 31Rect SkIRectToRect(const SkIRect& rect) { 32 return Rect(rect.x(), rect.y(), rect.width(), rect.height()); 33} 34 35SkRect RectFToSkRect(const RectF& rect) { 36 return SkRect::MakeXYWH(SkFloatToScalar(rect.x()), 37 SkFloatToScalar(rect.y()), 38 SkFloatToScalar(rect.width()), 39 SkFloatToScalar(rect.height())); 40} 41 42RectF SkRectToRectF(const SkRect& rect) { 43 return RectF(SkScalarToFloat(rect.x()), 44 SkScalarToFloat(rect.y()), 45 SkScalarToFloat(rect.width()), 46 SkScalarToFloat(rect.height())); 47} 48 49 50skia::RefPtr<SkShader> CreateImageRepShader(const gfx::ImageSkiaRep& image_rep, 51 SkShader::TileMode tile_mode, 52 const SkMatrix& local_matrix) { 53 skia::RefPtr<SkShader> shader = skia::AdoptRef(SkShader::CreateBitmapShader( 54 image_rep.sk_bitmap(), tile_mode, tile_mode)); 55 SkScalar scale_x = local_matrix.getScaleX(); 56 SkScalar scale_y = local_matrix.getScaleY(); 57 SkScalar bitmap_scale = SkFloatToScalar(image_rep.GetScale()); 58 59 // Unscale matrix by |bitmap_scale| such that the bitmap is drawn at the 60 // correct density. 61 // Convert skew and translation to pixel coordinates. 62 // Thus, for |bitmap_scale| = 2: 63 // x scale = 2, x translation = 1 DIP, 64 // should be converted to 65 // x scale = 1, x translation = 2 pixels. 66 SkMatrix shader_scale = local_matrix; 67 shader_scale.preScale(bitmap_scale, bitmap_scale); 68 shader_scale.setScaleX(SkScalarDiv(scale_x, bitmap_scale)); 69 shader_scale.setScaleY(SkScalarDiv(scale_y, bitmap_scale)); 70 71 shader->setLocalMatrix(shader_scale); 72 return shader; 73} 74 75skia::RefPtr<SkShader> CreateGradientShader(int start_point, 76 int end_point, 77 SkColor start_color, 78 SkColor end_color) { 79 SkColor grad_colors[2] = { start_color, end_color}; 80 SkPoint grad_points[2]; 81 grad_points[0].iset(0, start_point); 82 grad_points[1].iset(0, end_point); 83 84 return skia::AdoptRef(SkGradientShader::CreateLinear( 85 grad_points, grad_colors, NULL, 2, SkShader::kRepeat_TileMode)); 86} 87 88skia::RefPtr<SkDrawLooper> CreateShadowDrawLooper( 89 const std::vector<ShadowValue>& shadows) { 90 if (shadows.empty()) 91 return skia::RefPtr<SkDrawLooper>(); 92 93 skia::RefPtr<SkLayerDrawLooper> looper = 94 skia::AdoptRef(new SkLayerDrawLooper); 95 96 looper->addLayer(); // top layer of the original. 97 98 SkLayerDrawLooper::LayerInfo layer_info; 99 layer_info.fPaintBits |= SkLayerDrawLooper::kMaskFilter_Bit; 100 layer_info.fPaintBits |= SkLayerDrawLooper::kColorFilter_Bit; 101 layer_info.fColorMode = SkXfermode::kSrc_Mode; 102 103 for (size_t i = 0; i < shadows.size(); ++i) { 104 const ShadowValue& shadow = shadows[i]; 105 106 layer_info.fOffset.set(SkIntToScalar(shadow.x()), 107 SkIntToScalar(shadow.y())); 108 109 // SkBlurMaskFilter's blur radius defines the range to extend the blur from 110 // original mask, which is half of blur amount as defined in ShadowValue. 111 skia::RefPtr<SkMaskFilter> blur_mask = skia::AdoptRef( 112 SkBlurMaskFilter::Create(SkDoubleToScalar(shadow.blur() / 2), 113 SkBlurMaskFilter::kNormal_BlurStyle, 114 SkBlurMaskFilter::kHighQuality_BlurFlag)); 115 skia::RefPtr<SkColorFilter> color_filter = skia::AdoptRef( 116 SkColorFilter::CreateModeFilter(shadow.color(), 117 SkXfermode::kSrcIn_Mode)); 118 119 SkPaint* paint = looper->addLayer(layer_info); 120 paint->setMaskFilter(blur_mask.get()); 121 paint->setColorFilter(color_filter.get()); 122 } 123 124 return looper; 125} 126 127bool BitmapsAreEqual(const SkBitmap& bitmap1, const SkBitmap& bitmap2) { 128 void* addr1 = NULL; 129 void* addr2 = NULL; 130 size_t size1 = 0; 131 size_t size2 = 0; 132 133 bitmap1.lockPixels(); 134 addr1 = bitmap1.getAddr32(0, 0); 135 size1 = bitmap1.getSize(); 136 bitmap1.unlockPixels(); 137 138 bitmap2.lockPixels(); 139 addr2 = bitmap2.getAddr32(0, 0); 140 size2 = bitmap2.getSize(); 141 bitmap2.unlockPixels(); 142 143 return (size1 == size2) && (0 == memcmp(addr1, addr2, bitmap1.getSize())); 144} 145 146void ConvertSkiaToRGBA(const unsigned char* skia, 147 int pixel_width, 148 unsigned char* rgba) { 149 int total_length = pixel_width * 4; 150 for (int i = 0; i < total_length; i += 4) { 151 const uint32_t pixel_in = *reinterpret_cast<const uint32_t*>(&skia[i]); 152 153 // Pack the components here. 154 int alpha = SkGetPackedA32(pixel_in); 155 if (alpha != 0 && alpha != 255) { 156 SkColor unmultiplied = SkUnPreMultiply::PMColorToColor(pixel_in); 157 rgba[i + 0] = SkColorGetR(unmultiplied); 158 rgba[i + 1] = SkColorGetG(unmultiplied); 159 rgba[i + 2] = SkColorGetB(unmultiplied); 160 rgba[i + 3] = alpha; 161 } else { 162 rgba[i + 0] = SkGetPackedR32(pixel_in); 163 rgba[i + 1] = SkGetPackedG32(pixel_in); 164 rgba[i + 2] = SkGetPackedB32(pixel_in); 165 rgba[i + 3] = alpha; 166 } 167 } 168} 169 170} // namespace gfx 171