chromium/pdf/draw_utils/shadow.cc

// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "pdf/draw_utils/shadow.h"

#include <math.h>
#include <stddef.h>

#include <algorithm>

#include "base/check_op.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/size.h"

namespace chrome_pdf {
namespace draw_utils {

constexpr uint8_t kOpaqueAlpha = …;
constexpr uint8_t kTransparentAlpha = …;

inline uint8_t GetBlue(const uint32_t& pixel) { … }

inline uint8_t GetGreen(const uint32_t& pixel) { … }

inline uint8_t GetRed(const uint32_t& pixel) { … }

inline uint8_t GetAlpha(const uint32_t& pixel) { … }

inline uint32_t MakePixel(uint8_t red,
                          uint8_t green,
                          uint8_t blue,
                          uint8_t alpha) { … }

inline uint8_t ProcessColor(uint8_t src_color,
                            uint8_t dest_color,
                            uint8_t alpha) { … }

ShadowMatrix::ShadowMatrix(uint32_t depth, double factor, uint32_t background)
    : … { … }

ShadowMatrix::~ShadowMatrix() = default;

namespace {

void PaintShadow(SkBitmap& image,
                 const gfx::Rect& clip_rc,
                 const gfx::Rect& shadow_rc,
                 const ShadowMatrix& matrix) { … }

}  // namespace

void DrawShadow(SkBitmap& image,
                const gfx::Rect& shadow_rc,
                const gfx::Rect& object_rc,
                const gfx::Rect& clip_rc,
                const ShadowMatrix& matrix) { … }

}  // namespace draw_utils
}  // namespace chrome_pdf