ibuf_blt.h

[詳解]

/*
 * Copyright 2021 oZ/acy (名賀月晃嗣)
 * Redistribution and use in source and binary forms, 
 *     with or without modification, 
 *   are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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 */
/*
 * @file ibuf_blt.h
 * @author oZ/acy
 * @brief 畫像バッファクラステンプレートのblt系メンバ函數の實裝
 *
 * @date 2021.4.22 作成
 *
 */
/* This file is included by "imagebuffer.h". */
 
 
namespace eunomia::implement_
{
class Clipper_
{
public:
  int sx, sy;
  int w, h;
  int dx, dy;
 
private:
  bool flag_;
 
public:
  Clipper_(
    int srcx, int srcy, int srcw, int srch, int bltw, int blth,
    int dstx, int dsty, int dstw, int dsth, 
    const std::optional<Rect>& cliprect);
 
  explicit operator bool() const { return flag_; }
};
 
 
}//end of namespace eunomia::implement_
 
 
 
 
template<class C_> template<class CSrc, class Copier>
inline
void
eunomia::ImageBuffer<C_>::blt(
  const eunomia::ImageBuffer<CSrc>& src, int sx, int sy, int w, int h,
  int dx, int dy, const std::optional<eunomia::Rect>& cliprect,
  Copier copier)
{
  implement_::Clipper_
    clipper(
      sx, sy, src.width(), src.height(), w, h,
      dx, dy, width(), height(), cliprect);
 
  if (clipper) {
    auto dl = buffer() + pitch() * clipper.dy;
    auto sl = src.buffer() + src.pitch() * clipper.sy;
 
    for (int j = 0; j < clipper.h; ++j, dl += pitch(), sl += src.pitch())
      for (int i = 0; i < clipper.w; ++i)
        copier(
          reinterpret_cast<const CSrc*>(sl)[clipper.sx + i],
          reinterpret_cast<C_*>(dl)[clipper.dx + i]);
  }
}
 
 
 
 
//eof