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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;
// 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_; }
const uint32_t depth_;
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_