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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_GFX_SKIA_UTIL_H_
#define UI_GFX_SKIA_UTIL_H_
#include <string>
#include <vector>
#include "base/string16.h"
#include "third_party/skia/include/core/SkColor.h"
#include "third_party/skia/include/core/SkRect.h"
#include "third_party/skia/include/core/SkShader.h"
#include "ui/base/ui_export.h"
class SkBitmap;
class SkDrawLooper;
namespace gfx {
class ImageSkiaRep;
class Rect;
class ShadowValue;
// Convert between Skia and gfx rect types.
UI_EXPORT SkRect RectToSkRect(const gfx::Rect& rect);
UI_EXPORT SkIRect RectToSkIRect(const gfx::Rect& rect);
UI_EXPORT gfx::Rect SkRectToRect(const SkRect& rect);
// Creates a bitmap shader for the image rep with the image rep's scale factor.
// Sets the created shader's local matrix such that it displays the image rep at
// the correct scale factor.
// The shader's local matrix should not be changed after the shader is created.
// TODO(pkotwicz): Allow shader's local matrix to be changed after the shader
// is created.
// Example usage to avoid leaks:
// SkSafeUnref(paint.setShader(gfx::CreateImageRepShader(image_rep,
// tile_mode, matrix)));
//
// (The old shader in the paint, if any, needs to be freed, and SkSafeUnref will
// handle the NULL case.)
UI_EXPORT SkShader* CreateImageRepShader(const gfx::ImageSkiaRep& image_rep,
SkShader::TileMode tile_mode,
const SkMatrix& local_matrix);
// Creates a vertical gradient shader. The caller owns the shader.
// Example usage to avoid leaks:
// SkSafeUnref(paint.setShader(gfx::CreateGradientShader(0, 10, red, blue)));
//
// (The old shader in the paint, if any, needs to be freed, and SkSafeUnref will
// handle the NULL case.)
UI_EXPORT SkShader* CreateGradientShader(int start_point,
int end_point,
SkColor start_color,
SkColor end_color);
// Creates a draw looper to generate |shadows|. The caller owns the draw looper.
// NULL is returned if |shadows| is empty since no draw looper is needed in
// this case.
// Example usage to avoid leaks:
// SkSafeUnref(paint.setDrawLooper(gfx::CreateShadowDrawLooper(shadows)));
UI_EXPORT SkDrawLooper* CreateShadowDrawLooper(
const std::vector<ShadowValue>& shadows);
// Returns true if the two bitmaps contain the same pixels.
UI_EXPORT bool BitmapsAreEqual(const SkBitmap& bitmap1,
const SkBitmap& bitmap2);
// Strip the accelerator char (typically '&') from a menu string. A double
// accelerator char ('&&') will be converted to a single char. The out params
// |accelerated_char_pos| and |accelerated_char_span| will be set to the index
// and span of the last accelerated character, respectively, or -1 and 0 if
// there was none.
UI_EXPORT string16 RemoveAcceleratorChar(const string16& s,
char16 accelerator_char,
int* accelerated_char_pos,
int* accelerated_char_span);
// Converts Skia ARGB format pixels in |skia| to RGBA.
UI_EXPORT void ConvertSkiaToRGBA(const unsigned char* skia,
int pixel_width,
unsigned char* rgba);
} // namespace gfx
#endif // UI_GFX_SKIA_UTIL_H_
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