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/geometry/size.h"
  16 #include "ui/gfx/gfx_export.h"
  17
  18 class SkBitmap;
  19 class SkDrawLooper;
  20
  21 namespace gfx {
  22
  23 class ImageSkiaRep;
  24 class Rect;
  25 class RectF;
  26 class ShadowValue;
  27 class Transform;
  28
  29 // Convert between Skia and gfx rect types.
  30 GFX_EXPORT SkRect RectToSkRect(const Rect& rect);
  31 GFX_EXPORT SkIRect RectToSkIRect(const Rect& rect);
  32 GFX_EXPORT Rect SkIRectToRect(const SkIRect& rect);
  33 GFX_EXPORT SkRect RectFToSkRect(const RectF& rect);
  34 GFX_EXPORT RectF SkRectToRectF(const SkRect& rect);
  35 GFX_EXPORT SkSize SizeFToSkSize(const SizeF& size);
  36 GFX_EXPORT SizeF SkSizeToSizeF(const SkSize& size);
  37
  38 GFX_EXPORT void TransformToFlattenedSkMatrix(const gfx::Transform& transform,
  39                                              SkMatrix* flattened);
  40
  41 // Creates a bitmap shader for the image rep with the image rep's scale factor.
  42 // Sets the created shader's local matrix such that it displays the image rep at
  43 // the correct scale factor.
  44 // The shader's local matrix should not be changed after the shader is created.
  45 // TODO(pkotwicz): Allow shader's local matrix to be changed after the shader
  46 // is created.
  47 //
  48 GFX_EXPORT skia::RefPtr<SkShader> CreateImageRepShader(
  49     const gfx::ImageSkiaRep& image_rep,
  50     SkShader::TileMode tile_mode,
  51     const SkMatrix& local_matrix);
  52
  53 // Creates a bitmap shader for the image rep with the passed in scale factor.
  54 GFX_EXPORT skia::RefPtr<SkShader> CreateImageRepShaderForScale(
  55     const gfx::ImageSkiaRep& image_rep,
  56     SkShader::TileMode tile_mode,
  57     const SkMatrix& local_matrix,
  58     SkScalar scale);
  59
  60 // Creates a vertical gradient shader. The caller owns the shader.
  61 // Example usage to avoid leaks:
  62 GFX_EXPORT skia::RefPtr<SkShader> CreateGradientShader(int start_point,
  63                                                        int end_point,
  64                                                        SkColor start_color,
  65                                                        SkColor end_color);
  66
  67 // Creates a draw looper to generate |shadows|. The caller owns the draw looper.
  68 // NULL is returned if |shadows| is empty since no draw looper is needed in
  69 // this case.
  70 GFX_EXPORT skia::RefPtr<SkDrawLooper> CreateShadowDrawLooper(
  71     const std::vector<ShadowValue>& shadows);
  72
  73 // Returns true if the two bitmaps contain the same pixels.
  74 GFX_EXPORT bool BitmapsAreEqual(const SkBitmap& bitmap1,
  75                                 const SkBitmap& bitmap2);
  76
  77 // Converts Skia ARGB format pixels in |skia| to RGBA.
  78 GFX_EXPORT void ConvertSkiaToRGBA(const unsigned char* skia,
  79                                   int pixel_width,
  80                                   unsigned char* rgba);
  81
  82 }  // namespace gfx
  83
  84 #endif  // UI_GFX_SKIA_UTIL_H_