ef9f45d785
R=thestig@chromium.org Review URL: https://codereview.chromium.org/1909383002 Cr-Commit-Position: refs/heads/master@{#389225}
62 lines
1.8 KiB
C++
62 lines
1.8 KiB
C++
// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef PDF_DRAW_UTILS_H_
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#define PDF_DRAW_UTILS_H_
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#include <stdint.h>
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#include <vector>
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#include "ppapi/cpp/image_data.h"
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#include "ppapi/cpp/rect.h"
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namespace chrome_pdf {
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const uint8_t kOpaqueAlpha = 0xFF;
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const uint8_t kTransparentAlpha = 0x00;
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// Shadow Matrix contains matrix for shadow rendering. To reduce amount of
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// calculations user may choose to cache matrix and reuse it if nothing changed.
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class ShadowMatrix {
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public:
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// Matrix parameters.
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// depth - how big matrix should be. Shadow will go smoothly across the
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// entire matrix from black to background color.
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// If factor == 1, smoothing will be linear from 0 to the end (depth),
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// if 0 < factor < 1, smoothing will drop faster near 0.
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// if factor > 1, smoothing will drop faster near the end (depth).
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ShadowMatrix(uint32_t depth, double factor, uint32_t background);
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~ShadowMatrix();
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uint32_t GetValue(int32_t x, int32_t y) const {
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return matrix_[y * depth_ + x];
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}
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uint32_t depth() const { return depth_; }
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double factor() const { return factor_; }
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uint32_t background() const { return background_; }
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private:
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uint32_t depth_;
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double factor_;
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uint32_t background_;
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std::vector<uint32_t> matrix_;
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};
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// Draw shadow on the image using provided ShadowMatrix.
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// shadow_rc - rectangle occupied by shadow
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// object_rc - rectangle that drops the shadow
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// clip_rc - clipping region
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void DrawShadow(pp::ImageData* image,
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const pp::Rect& shadow_rc,
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const pp::Rect& object_rc,
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const pp::Rect& clip_rc,
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const ShadowMatrix& matrix);
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} // namespace chrome_pdf
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#endif // PDF_DRAW_UTILS_H_
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