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#ifndef UI_GFX_SKIA_UTIL_H_
6#define UI_GFX_SKIA_UTIL_H_
7
8#include <string>
9#include <vector>
10
11#include "skia/ext/refptr.h"
12#include "third_party/skia/include/core/SkColor.h"
13#include "third_party/skia/include/core/SkRect.h"
14#include "third_party/skia/include/core/SkShader.h"
15#include "ui/gfx/gfx_export.h"
16
17class SkBitmap;
18class SkDrawLooper;
19
20namespace gfx {
21
22class ImageSkiaRep;
23class Rect;
24class RectF;
25class ShadowValue;
26class Transform;
27
28// Convert between Skia and gfx rect types.
29GFX_EXPORT SkRect RectToSkRect(const Rect& rect);
30GFX_EXPORT SkIRect RectToSkIRect(const Rect& rect);
31GFX_EXPORT Rect SkIRectToRect(const SkIRect& rect);
32GFX_EXPORT SkRect RectFToSkRect(const RectF& rect);
33GFX_EXPORT RectF SkRectToRectF(const SkRect& rect);
34
35GFX_EXPORT void TransformToFlattenedSkMatrix(const gfx::Transform& transform,
36                                             SkMatrix* flattened);
37
38// Creates a bitmap shader for the image rep with the image rep's scale factor.
39// Sets the created shader's local matrix such that it displays the image rep at
40// the correct scale factor.
41// The shader's local matrix should not be changed after the shader is created.
42// TODO(pkotwicz): Allow shader's local matrix to be changed after the shader
43// is created.
44//
45GFX_EXPORT skia::RefPtr<SkShader> CreateImageRepShader(
46    const gfx::ImageSkiaRep& image_rep,
47    SkShader::TileMode tile_mode,
48    const SkMatrix& local_matrix);
49
50// Creates a bitmap shader for the image rep with the passed in scale factor.
51GFX_EXPORT skia::RefPtr<SkShader> CreateImageRepShaderForScale(
52    const gfx::ImageSkiaRep& image_rep,
53    SkShader::TileMode tile_mode,
54    const SkMatrix& local_matrix,
55    SkScalar scale);
56
57// Creates a vertical gradient shader. The caller owns the shader.
58// Example usage to avoid leaks:
59GFX_EXPORT skia::RefPtr<SkShader> CreateGradientShader(int start_point,
60                                                       int end_point,
61                                                       SkColor start_color,
62                                                       SkColor end_color);
63
64// Creates a draw looper to generate |shadows|. The caller owns the draw looper.
65// NULL is returned if |shadows| is empty since no draw looper is needed in
66// this case.
67GFX_EXPORT skia::RefPtr<SkDrawLooper> CreateShadowDrawLooper(
68    const std::vector<ShadowValue>& shadows);
69
70// Returns true if the two bitmaps contain the same pixels.
71GFX_EXPORT bool BitmapsAreEqual(const SkBitmap& bitmap1,
72                                const SkBitmap& bitmap2);
73
74// Converts Skia ARGB format pixels in |skia| to RGBA.
75GFX_EXPORT void ConvertSkiaToRGBA(const unsigned char* skia,
76                                  int pixel_width,
77                                  unsigned char* rgba);
78
79}  // namespace gfx
80
81#endif  // UI_GFX_SKIA_UTIL_H_
82