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/quad_f.h"
  16 #include "ui/gfx/geometry/size.h"
  17 #include "ui/gfx/gfx_export.h"
  18
  19 class SkBitmap;
  20 class SkDrawLooper;
  21
  22 namespace gfx {
  23
  24 class ImageSkiaRep;
  25 class Rect;
  26 class RectF;
  27 class ShadowValue;
  28 class Transform;
  29
  30 // Convert between Skia and gfx rect types.
  31 GFX_EXPORT SkRect RectToSkRect(const Rect& rect);
  32 GFX_EXPORT SkIRect RectToSkIRect(const Rect& rect);
  33 GFX_EXPORT Rect SkIRectToRect(const SkIRect& rect);
  34 GFX_EXPORT SkRect RectFToSkRect(const RectF& rect);
  35 GFX_EXPORT RectF SkRectToRectF(const SkRect& rect);
  36 GFX_EXPORT SkSize SizeFToSkSize(const SizeF& size);
  37 GFX_EXPORT SizeF SkSizeToSizeF(const SkSize& size);
  38
  39 GFX_EXPORT void QuadFToSkPoints(const gfx::QuadF& quad, SkPoint points[4]);
  40
  41 GFX_EXPORT void TransformToFlattenedSkMatrix(const gfx::Transform& transform,
  42                                              SkMatrix* flattened);
  43
  44 // Creates a bitmap shader for the image rep with the image rep's scale factor.
  45 // Sets the created shader's local matrix such that it displays the image rep at
  46 // the correct scale factor.
  47 // The shader's local matrix should not be changed after the shader is created.
  48 // TODO(pkotwicz): Allow shader's local matrix to be changed after the shader
  49 // is created.
  50 //
  51 GFX_EXPORT skia::RefPtr<SkShader> CreateImageRepShader(
  52     const gfx::ImageSkiaRep& image_rep,
  53     SkShader::TileMode tile_mode,
  54     const SkMatrix& local_matrix);
  55
  56 // Creates a bitmap shader for the image rep with the passed in scale factor.
  57 GFX_EXPORT skia::RefPtr<SkShader> CreateImageRepShaderForScale(
  58     const gfx::ImageSkiaRep& image_rep,
  59     SkShader::TileMode tile_mode,
  60     const SkMatrix& local_matrix,
  61     SkScalar scale);
  62
  63 // Creates a vertical gradient shader. The caller owns the shader.
  64 // Example usage to avoid leaks:
  65 GFX_EXPORT skia::RefPtr<SkShader> CreateGradientShader(int start_point,
  66                                                        int end_point,
  67                                                        SkColor start_color,
  68                                                        SkColor end_color);
  69
  70 // Creates a draw looper to generate |shadows|. The caller owns the draw looper.
  71 // NULL is returned if |shadows| is empty since no draw looper is needed in
  72 // this case.
  73 GFX_EXPORT skia::RefPtr<SkDrawLooper> CreateShadowDrawLooper(
  74     const std::vector<ShadowValue>& shadows);
  75
  76 // Returns true if the two bitmaps contain the same pixels.
  77 GFX_EXPORT bool BitmapsAreEqual(const SkBitmap& bitmap1,
  78                                 const SkBitmap& bitmap2);
  79
  80 // Converts Skia ARGB format pixels in |skia| to RGBA.
  81 GFX_EXPORT void ConvertSkiaToRGBA(const unsigned char* skia,
  82                                   int pixel_width,
  83                                   unsigned char* rgba);
  84
  85 }  // namespace gfx
  86
  87 #endif  // UI_GFX_SKIA_UTIL_H_