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
RectToSkRect(const Rect & rect)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
RectToSkIRect(const Rect & rect)28 SkIRect RectToSkIRect(const Rect& rect) {
29 return SkIRect::MakeXYWH(rect.x(), rect.y(), rect.width(), rect.height());
30 }
31
SkIRectToRect(const SkIRect & rect)32 Rect SkIRectToRect(const SkIRect& rect) {
33 return Rect(rect.x(), rect.y(), rect.width(), rect.height());
34 }
35
RectFToSkRect(const RectF & rect)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
SkRectToRectF(const SkRect & rect)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
TransformToFlattenedSkMatrix(const gfx::Transform & transform,SkMatrix * flattened)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
CreateImageRepShader(const gfx::ImageSkiaRep & image_rep,SkShader::TileMode tile_mode,const SkMatrix & local_matrix)64 skia::RefPtr<SkShader> CreateImageRepShader(const gfx::ImageSkiaRep& image_rep,
65 SkShader::TileMode tile_mode,
66 const SkMatrix& local_matrix) {
67 skia::RefPtr<SkShader> shader = skia::AdoptRef(SkShader::CreateBitmapShader(
68 image_rep.sk_bitmap(), tile_mode, tile_mode));
69 SkScalar scale_x = local_matrix.getScaleX();
70 SkScalar scale_y = local_matrix.getScaleY();
71 SkScalar bitmap_scale = SkFloatToScalar(image_rep.scale());
72
73 // Unscale matrix by |bitmap_scale| such that the bitmap is drawn at the
74 // correct density.
75 // Convert skew and translation to pixel coordinates.
76 // Thus, for |bitmap_scale| = 2:
77 // x scale = 2, x translation = 1 DIP,
78 // should be converted to
79 // x scale = 1, x translation = 2 pixels.
80 SkMatrix shader_scale = local_matrix;
81 shader_scale.preScale(bitmap_scale, bitmap_scale);
82 shader_scale.setScaleX(SkScalarDiv(scale_x, bitmap_scale));
83 shader_scale.setScaleY(SkScalarDiv(scale_y, bitmap_scale));
84
85 shader->setLocalMatrix(shader_scale);
86 return shader;
87 }
88
CreateGradientShader(int start_point,int end_point,SkColor start_color,SkColor end_color)89 skia::RefPtr<SkShader> CreateGradientShader(int start_point,
90 int end_point,
91 SkColor start_color,
92 SkColor end_color) {
93 SkColor grad_colors[2] = { start_color, end_color};
94 SkPoint grad_points[2];
95 grad_points[0].iset(0, start_point);
96 grad_points[1].iset(0, end_point);
97
98 return skia::AdoptRef(SkGradientShader::CreateLinear(
99 grad_points, grad_colors, NULL, 2, SkShader::kRepeat_TileMode));
100 }
101
CreateShadowDrawLooper(const std::vector<ShadowValue> & shadows)102 skia::RefPtr<SkDrawLooper> CreateShadowDrawLooper(
103 const std::vector<ShadowValue>& shadows) {
104 if (shadows.empty())
105 return skia::RefPtr<SkDrawLooper>();
106
107 skia::RefPtr<SkLayerDrawLooper> looper =
108 skia::AdoptRef(new SkLayerDrawLooper);
109
110 looper->addLayer(); // top layer of the original.
111
112 SkLayerDrawLooper::LayerInfo layer_info;
113 layer_info.fPaintBits |= SkLayerDrawLooper::kMaskFilter_Bit;
114 layer_info.fPaintBits |= SkLayerDrawLooper::kColorFilter_Bit;
115 layer_info.fColorMode = SkXfermode::kSrc_Mode;
116
117 for (size_t i = 0; i < shadows.size(); ++i) {
118 const ShadowValue& shadow = shadows[i];
119
120 layer_info.fOffset.set(SkIntToScalar(shadow.x()),
121 SkIntToScalar(shadow.y()));
122
123 // SkBlurMaskFilter's blur radius defines the range to extend the blur from
124 // original mask, which is half of blur amount as defined in ShadowValue.
125 skia::RefPtr<SkMaskFilter> blur_mask = skia::AdoptRef(
126 SkBlurMaskFilter::Create(SkDoubleToScalar(shadow.blur() / 2),
127 SkBlurMaskFilter::kNormal_BlurStyle,
128 SkBlurMaskFilter::kHighQuality_BlurFlag));
129 skia::RefPtr<SkColorFilter> color_filter = skia::AdoptRef(
130 SkColorFilter::CreateModeFilter(shadow.color(),
131 SkXfermode::kSrcIn_Mode));
132
133 SkPaint* paint = looper->addLayer(layer_info);
134 paint->setMaskFilter(blur_mask.get());
135 paint->setColorFilter(color_filter.get());
136 }
137
138 return looper;
139 }
140
BitmapsAreEqual(const SkBitmap & bitmap1,const SkBitmap & bitmap2)141 bool BitmapsAreEqual(const SkBitmap& bitmap1, const SkBitmap& bitmap2) {
142 void* addr1 = NULL;
143 void* addr2 = NULL;
144 size_t size1 = 0;
145 size_t size2 = 0;
146
147 bitmap1.lockPixels();
148 addr1 = bitmap1.getAddr32(0, 0);
149 size1 = bitmap1.getSize();
150 bitmap1.unlockPixels();
151
152 bitmap2.lockPixels();
153 addr2 = bitmap2.getAddr32(0, 0);
154 size2 = bitmap2.getSize();
155 bitmap2.unlockPixels();
156
157 return (size1 == size2) && (0 == memcmp(addr1, addr2, bitmap1.getSize()));
158 }
159
ConvertSkiaToRGBA(const unsigned char * skia,int pixel_width,unsigned char * rgba)160 void ConvertSkiaToRGBA(const unsigned char* skia,
161 int pixel_width,
162 unsigned char* rgba) {
163 int total_length = pixel_width * 4;
164 for (int i = 0; i < total_length; i += 4) {
165 const uint32_t pixel_in = *reinterpret_cast<const uint32_t*>(&skia[i]);
166
167 // Pack the components here.
168 int alpha = SkGetPackedA32(pixel_in);
169 if (alpha != 0 && alpha != 255) {
170 SkColor unmultiplied = SkUnPreMultiply::PMColorToColor(pixel_in);
171 rgba[i + 0] = SkColorGetR(unmultiplied);
172 rgba[i + 1] = SkColorGetG(unmultiplied);
173 rgba[i + 2] = SkColorGetB(unmultiplied);
174 rgba[i + 3] = alpha;
175 } else {
176 rgba[i + 0] = SkGetPackedR32(pixel_in);
177 rgba[i + 1] = SkGetPackedG32(pixel_in);
178 rgba[i + 2] = SkGetPackedB32(pixel_in);
179 rgba[i + 3] = alpha;
180 }
181 }
182 }
183
184 } // namespace gfx
185