ui/gfx/skia_util.h

   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
  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 GFX_EXPORT SkRect RectToSkRect(const Rect& rect);
  30 GFX_EXPORT SkIRect RectToSkIRect(const Rect& rect);
  31 GFX_EXPORT Rect SkIRectToRect(const SkIRect& rect);
  32 GFX_EXPORT SkRect RectFToSkRect(const RectF& rect);
  33 GFX_EXPORT RectF SkRectToRectF(const SkRect& rect);
  34
  35 GFX_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 GFX_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.
  51 GFX_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:
  59 GFX_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.
  67 GFX_EXPORT skia::RefPtr<SkDrawLooper> CreateShadowDrawLooper(
  68     const std::vector<ShadowValue>& shadows);
  69
  70 // Returns true if the two bitmaps contain the same pixels.
  71 GFX_EXPORT bool BitmapsAreEqual(const SkBitmap& bitmap1,
  72                                 const SkBitmap& bitmap2);
  73
  74 // Converts Skia ARGB format pixels in |skia| to RGBA.
  75 GFX_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_