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 #include "ui/gfx/transform.h" 19 20 namespace gfx { 21 22 SkRect RectToSkRect(const Rect& rect) { 23 SkRect r; 24 r.iset(rect.x(), rect.y(), rect.right(), rect.bottom()); 25 return r; 26 } 27 28 SkIRect RectToSkIRect(const Rect& rect) { 29 return SkIRect::MakeXYWH(rect.x(), rect.y(), rect.width(), rect.height()); 30 } 31 32 Rect SkIRectToRect(const SkIRect& rect) { 33 return Rect(rect.x(), rect.y(), rect.width(), rect.height()); 34 } 35 36 SkRect RectFToSkRect(const RectF& rect) { 37 return SkRect::MakeXYWH(SkFloatToScalar(rect.x()), 38 SkFloatToScalar(rect.y()), 39 SkFloatToScalar(rect.width()), 40 SkFloatToScalar(rect.height())); 41 } 42 43 RectF SkRectToRectF(const SkRect& rect) { 44 return RectF(SkScalarToFloat(rect.x()), 45 SkScalarToFloat(rect.y()), 46 SkScalarToFloat(rect.width()), 47 SkScalarToFloat(rect.height())); 48 } 49 50 void TransformToFlattenedSkMatrix(const gfx::Transform& transform, 51 SkMatrix* flattened) { 52 // Convert from 4x4 to 3x3 by dropping the third row and column. 53 flattened->set(0, SkMScalarToScalar(transform.matrix().get(0, 0))); 54 flattened->set(1, SkMScalarToScalar(transform.matrix().get(0, 1))); 55 flattened->set(2, SkMScalarToScalar(transform.matrix().get(0, 3))); 56 flattened->set(3, SkMScalarToScalar(transform.matrix().get(1, 0))); 57 flattened->set(4, SkMScalarToScalar(transform.matrix().get(1, 1))); 58 flattened->set(5, SkMScalarToScalar(transform.matrix().get(1, 3))); 59 flattened->set(6, SkMScalarToScalar(transform.matrix().get(3, 0))); 60 flattened->set(7, SkMScalarToScalar(transform.matrix().get(3, 1))); 61 flattened->set(8, SkMScalarToScalar(transform.matrix().get(3, 3))); 62 } 63 64 skia::RefPtr<SkShader> CreateImageRepShader(const gfx::ImageSkiaRep& image_rep, 65 SkShader::TileMode tile_mode, 66 const SkMatrix& local_matrix) { 67 return CreateImageRepShaderForScale(image_rep, tile_mode, local_matrix, 68 image_rep.scale()); 69 } 70 71 skia::RefPtr<SkShader> CreateImageRepShaderForScale( 72 const gfx::ImageSkiaRep& image_rep, 73 SkShader::TileMode tile_mode, 74 const SkMatrix& local_matrix, 75 SkScalar scale) { 76 // Unscale matrix by |scale| such that the bitmap is drawn at the 77 // correct density. 78 // Convert skew and translation to pixel coordinates. 79 // Thus, for |bitmap_scale| = 2: 80 // x scale = 2, x translation = 1 DIP, 81 // should be converted to 82 // x scale = 1, x translation = 2 pixels. 83 SkMatrix shader_scale = local_matrix; 84 shader_scale.preScale(scale, scale); 85 shader_scale.setScaleX(local_matrix.getScaleX() / scale); 86 shader_scale.setScaleY(local_matrix.getScaleY() / scale); 87 88 skia::RefPtr<SkShader> shader = skia::AdoptRef(SkShader::CreateBitmapShader( 89 image_rep.sk_bitmap(), tile_mode, tile_mode, &shader_scale)); 90 return shader; 91 } 92 93 skia::RefPtr<SkShader> CreateGradientShader(int start_point, 94 int end_point, 95 SkColor start_color, 96 SkColor end_color) { 97 SkColor grad_colors[2] = { start_color, end_color}; 98 SkPoint grad_points[2]; 99 grad_points[0].iset(0, start_point); 100 grad_points[1].iset(0, end_point); 101 102 return skia::AdoptRef(SkGradientShader::CreateLinear( 103 grad_points, grad_colors, NULL, 2, SkShader::kRepeat_TileMode)); 104 } 105 106 static SkScalar RadiusToSigma(double radius) { 107 // This captures historically what skia did under the hood. Now skia accepts 108 // sigma, not radius, so we perform the conversion. 109 return radius > 0 ? SkDoubleToScalar(0.57735f * radius + 0.5) : 0; 110 } 111 112 skia::RefPtr<SkDrawLooper> CreateShadowDrawLooper( 113 const std::vector<ShadowValue>& shadows) { 114 if (shadows.empty()) 115 return skia::RefPtr<SkDrawLooper>(); 116 117 SkLayerDrawLooper::Builder looper_builder; 118 119 looper_builder.addLayer(); // top layer of the original. 120 121 SkLayerDrawLooper::LayerInfo layer_info; 122 layer_info.fPaintBits |= SkLayerDrawLooper::kMaskFilter_Bit; 123 layer_info.fPaintBits |= SkLayerDrawLooper::kColorFilter_Bit; 124 layer_info.fColorMode = SkXfermode::kSrc_Mode; 125 126 for (size_t i = 0; i < shadows.size(); ++i) { 127 const ShadowValue& shadow = shadows[i]; 128 129 layer_info.fOffset.set(SkIntToScalar(shadow.x()), 130 SkIntToScalar(shadow.y())); 131 132 // SkBlurMaskFilter's blur radius defines the range to extend the blur from 133 // original mask, which is half of blur amount as defined in ShadowValue. 134 skia::RefPtr<SkMaskFilter> blur_mask = skia::AdoptRef( 135 SkBlurMaskFilter::Create(kNormal_SkBlurStyle, 136 RadiusToSigma(shadow.blur() / 2), 137 SkBlurMaskFilter::kHighQuality_BlurFlag)); 138 skia::RefPtr<SkColorFilter> color_filter = skia::AdoptRef( 139 SkColorFilter::CreateModeFilter(shadow.color(), 140 SkXfermode::kSrcIn_Mode)); 141 142 SkPaint* paint = looper_builder.addLayer(layer_info); 143 paint->setMaskFilter(blur_mask.get()); 144 paint->setColorFilter(color_filter.get()); 145 } 146 147 return skia::AdoptRef<SkDrawLooper>(looper_builder.detachLooper()); 148 } 149 150 bool BitmapsAreEqual(const SkBitmap& bitmap1, const SkBitmap& bitmap2) { 151 void* addr1 = NULL; 152 void* addr2 = NULL; 153 size_t size1 = 0; 154 size_t size2 = 0; 155 156 bitmap1.lockPixels(); 157 addr1 = bitmap1.getAddr32(0, 0); 158 size1 = bitmap1.getSize(); 159 bitmap1.unlockPixels(); 160 161 bitmap2.lockPixels(); 162 addr2 = bitmap2.getAddr32(0, 0); 163 size2 = bitmap2.getSize(); 164 bitmap2.unlockPixels(); 165 166 return (size1 == size2) && (0 == memcmp(addr1, addr2, bitmap1.getSize())); 167 } 168 169 void ConvertSkiaToRGBA(const unsigned char* skia, 170 int pixel_width, 171 unsigned char* rgba) { 172 int total_length = pixel_width * 4; 173 for (int i = 0; i < total_length; i += 4) { 174 const uint32_t pixel_in = *reinterpret_cast<const uint32_t*>(&skia[i]); 175 176 // Pack the components here. 177 int alpha = SkGetPackedA32(pixel_in); 178 if (alpha != 0 && alpha != 255) { 179 SkColor unmultiplied = SkUnPreMultiply::PMColorToColor(pixel_in); 180 rgba[i + 0] = SkColorGetR(unmultiplied); 181 rgba[i + 1] = SkColorGetG(unmultiplied); 182 rgba[i + 2] = SkColorGetB(unmultiplied); 183 rgba[i + 3] = alpha; 184 } else { 185 rgba[i + 0] = SkGetPackedR32(pixel_in); 186 rgba[i + 1] = SkGetPackedG32(pixel_in); 187 rgba[i + 2] = SkGetPackedB32(pixel_in); 188 rgba[i + 3] = alpha; 189 } 190 } 191 } 192 193 } // namespace gfx 194
