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// Copyright (c) 2011 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.
#include <stdint.h>
#include <vector>
#include "ppapi/cpp/image_data.h"
#include "ppapi/cpp/rect.h"
namespace chrome_pdf {
const uint8_t kOpaqueAlpha = 0xFF;
const uint8_t kTransparentAlpha = 0x00;
void AlphaBlend(const pp::ImageData& src,
const pp::Rect& src_rc,
pp::ImageData* dest,
const pp::Point& dest_origin,
uint8_t alpha_adjustment);
// Fill rectangle with gradient horizontally or vertically. Start is a color of
// top-left point of the rectangle, end color is a color of
// top-right (horizontal==true) or bottom-left (horizontal==false) point.
void GradientFill(pp::ImageData* image,
const pp::Rect& rc,
uint32_t start_color,
uint32_t end_color,
bool horizontal);
// Fill dirty rectangle with gradient, where gradient color set for corners of
// gradient rectangle. Parts of the dirty rect outside of gradient rect will
// be unchanged.
void GradientFill(pp::Instance* instance,
pp::ImageData* image,
const pp::Rect& dirty_rc,
const pp::Rect& gradient_rc,
uint32_t start_color,
uint32_t end_color,
bool horizontal,
uint8_t transparency);
// Copy one image into another. If stretch is true, the result occupy the entire
// dest_rc. If stretch is false, dest_rc.point will be used as an origin of the
// result image. Copy will ignore all pixels with transparent alpha from the
// source image.
void CopyImage(const pp::ImageData& src, const pp::Rect& src_rc,
pp::ImageData* dest, const pp::Rect& dest_rc,
bool stretch);
// Fill in rectangle with specified color.
void FillRect(pp::ImageData* image, const pp::Rect& rc, uint32_t color);
// Shadow Matrix contains matrix for shadow rendering. To reduce amount of
// calculations user may choose to cache matrix and reuse it if nothing changed.
class ShadowMatrix {
// Matrix parameters.
// depth - how big matrix should be. Shadow will go smoothly across the
// entire matrix from black to background color.
// If factor == 1, smoothing will be linear from 0 to the end (depth),
// if 0 < factor < 1, smoothing will drop faster near 0.
// if factor > 1, smoothing will drop faster near the end (depth).
ShadowMatrix(uint32_t depth, double factor, uint32_t background);
uint32_t GetValue(int32_t x, int32_t y) const {
return matrix_[y * depth_ + x];
uint32_t depth() const { return depth_; }
double factor() const { return factor_; }
uint32_t background() const { return background_; }
uint32_t depth_;
double factor_;
uint32_t background_;
std::vector<uint32_t> matrix_;
// Draw shadow on the image using provided ShadowMatrix.
// shadow_rc - rectangle occupied by shadow
// object_rc - rectangle that drops the shadow
// clip_rc - clipping region
void DrawShadow(pp::ImageData* image,
const pp::Rect& shadow_rc,
const pp::Rect& object_rc,
const pp::Rect& clip_rc,
const ShadowMatrix& matrix);
} // namespace chrome_pdf
#endif // PDF_DRAW_UTILS_H_