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
20namespace gfx {
21
22SkRect RectToSkRect(const Rect& rect) {
23  SkRect r;
24  r.iset(rect.x(), rect.y(), rect.right(), rect.bottom());
25  return r;
26}
27
28SkIRect RectToSkIRect(const Rect& rect) {
29  return SkIRect::MakeXYWH(rect.x(), rect.y(), rect.width(), rect.height());
30}
31
32Rect SkIRectToRect(const SkIRect& rect) {
33  return Rect(rect.x(), rect.y(), rect.width(), rect.height());
34}
35
36SkRect 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
43RectF SkRectToRectF(const SkRect& rect) {
44  return RectF(SkScalarToFloat(rect.x()),
45               SkScalarToFloat(rect.y()),
46               SkScalarToFloat(rect.width()),
47               SkScalarToFloat(rect.height()));
48}
49
50void 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, SkDoubleToScalar(transform.matrix().getDouble(0, 0)));
54  flattened->set(1, SkDoubleToScalar(transform.matrix().getDouble(0, 1)));
55  flattened->set(2, SkDoubleToScalar(transform.matrix().getDouble(0, 3)));
56  flattened->set(3, SkDoubleToScalar(transform.matrix().getDouble(1, 0)));
57  flattened->set(4, SkDoubleToScalar(transform.matrix().getDouble(1, 1)));
58  flattened->set(5, SkDoubleToScalar(transform.matrix().getDouble(1, 3)));
59  flattened->set(6, SkDoubleToScalar(transform.matrix().getDouble(3, 0)));
60  flattened->set(7, SkDoubleToScalar(transform.matrix().getDouble(3, 1)));
61  flattened->set(8, SkDoubleToScalar(transform.matrix().getDouble(3, 3)));
62}
63
64skia::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.GetScale());
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
89skia::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
102skia::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
141bool 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
160void 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