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      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/base/ui_export.h"
     16 
     17 class SkBitmap;
     18 class SkDrawLooper;
     19 
     20 namespace gfx {
     21 
     22 class ImageSkiaRep;
     23 class Rect;
     24 class RectF;
     25 class ShadowValue;
     26 class Transform;
     27 
     28 // Convert between Skia and gfx rect types.
     29 UI_EXPORT SkRect RectToSkRect(const Rect& rect);
     30 UI_EXPORT SkIRect RectToSkIRect(const Rect& rect);
     31 UI_EXPORT Rect SkIRectToRect(const SkIRect& rect);
     32 UI_EXPORT SkRect RectFToSkRect(const RectF& rect);
     33 UI_EXPORT RectF SkRectToRectF(const SkRect& rect);
     34 
     35 UI_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 //
     45 UI_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 vertical gradient shader. The caller owns the shader.
     51 // Example usage to avoid leaks:
     52 UI_EXPORT skia::RefPtr<SkShader> CreateGradientShader(int start_point,
     53                                                       int end_point,
     54                                                       SkColor start_color,
     55                                                       SkColor end_color);
     56 
     57 // Creates a draw looper to generate |shadows|. The caller owns the draw looper.
     58 // NULL is returned if |shadows| is empty since no draw looper is needed in
     59 // this case.
     60 UI_EXPORT skia::RefPtr<SkDrawLooper> CreateShadowDrawLooper(
     61     const std::vector<ShadowValue>& shadows);
     62 
     63 // Returns true if the two bitmaps contain the same pixels.
     64 UI_EXPORT bool BitmapsAreEqual(const SkBitmap& bitmap1,
     65                                const SkBitmap& bitmap2);
     66 
     67 // Converts Skia ARGB format pixels in |skia| to RGBA.
     68 UI_EXPORT void ConvertSkiaToRGBA(const unsigned char* skia,
     69                                  int pixel_width,
     70                                  unsigned char* rgba);
     71 
     72 }  // namespace gfx
     73 
     74 #endif  // UI_GFX_SKIA_UTIL_H_
     75