imagebuffer.h

[詳解]

/*
 * Copyright 2002-2021 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
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */
#ifndef INCLUDE_GUARD_EUNOMIA_IMAGEBUFFER_H
#define INCLUDE_GUARD_EUNOMIA_IMAGEBUFFER_H
 
#include <algorithm>
#include <optional>
#include <cstdint>
#include "exception.h"
#include "noncopyable.h"
#include "rect.h"
 
 
namespace eunomia
{
 
struct Point
{
  int x; 
  int y; 
 
  Point() = default;
  constexpr Point(int xx, int yy) noexcept : x(xx), y(yy) {}
};
 
 
class RangeOverException : public eunomia::Exception
{
public:
  RangeOverException() : Exception("eunomia::RangeOverException") {}
};
 
 
 
 
template<class C_>
class ImageBuffer : Noncopyable<ImageBuffer<C_>>
{
public:
  typedef C_ ColourType;
 
protected:
  std::uint8_t* buf_;  
  int w_;  
  int h_;  
  int pitch_;  
 
  ImageBuffer(int w, int h, int p) noexcept
    : buf_(nullptr), w_(w), h_(h), pitch_(p)
    {}
 
public:
  virtual ~ImageBuffer() = default;
 
  //====================================
  //  各種情報取得
  //====================================
 
  int width() const noexcept { return w_; }
  int height() const noexcept { return h_; }
  int pitch() const noexcept { return pitch_; }
 
  uint8_t* buffer() noexcept { return buf_; }
  const uint8_t* buffer() const noexcept { return buf_; }
 
  C_* lineBuffer(int y) noexcept
    { return reinterpret_cast<C_*>(buf_ + pitch_ * y); }
 
  const C_* lineBuffer(int y) const noexcept
    { return reinterpret_cast<const C_*>(buf_ + pitch_ * y); }
 
  //====================================
  //  畫素の參照
  //====================================
 
  C_& pixel(int x, int y) noexcept { return lineBuffer(y)[x]; }
 
  const C_& pixel(int x, int y) const noexcept { return lineBuffer(y)[x]; }
 
  C_& at(int x, int y)
  {
    if (x < 0 || y < 0 || x >= w_ || y >= h_)
      throw RangeOverException();
    return pixel(x, y);
  }
 
  const C_& at(int x, int y) const
  {
    if (x < 0 || y < 0 || x >= w_ || y >= h_)
      throw RangeOverException();
    return pixel(x, y);
  }
 
 
  //==================================================================
  //  圖形描畫
  //==================================================================
 
  void line(int x1, int y1, int x2, int y2, const C_& color);
 
  void box(
    int left, int top, int right, int bottom, const C_& color,
    bool fill = false);
 
  void ellipse(
    int x, int y, int a, int b, const C_& color, bool fill = false);
 
  void circle(int x, int y, int r, const C_& color, bool fill = false)
  {
    ellipse(x, y, r, r, color, fill);
  }
 
  void paintFill(int x, int y, const C_& color);
 
  void clear(const C_& color);
 
 
  //==================================================================
  //  轉送
  //==================================================================
 
  template<class CSrc, class Copier>
  void
  blt(
    const ImageBuffer<CSrc>& src, int sx, int sy, int w, int h,
    int dx, int dy, const std::optional<Rect>& cliprect, Copier copier);
 
  template<class CSrc>
  void
  blt(
    const ImageBuffer<CSrc>& src, int sx, int sy, int w, int h,
    int dx, int dy, const std::optional<Rect>& cliprect = std::nullopt)
  {
    blt(
      src, sx, sy, w, h, dx, dy, cliprect,
      [](const CSrc& spixel, C_& dpixel){ dpixel = spixel; });
  }
 
 
  //==============================================
  // その他
  //==============================================
 
  template<class Func>
  void forEachPixel(Func func)
  {
    for (int j = 0; j < h_; ++j)
      std::for_each_n(lineBuffer(j), w_, func);
  }
};
 
 
template<class C_>
void grayscale(C_& pixel)
{
  std::uint8_t l
    = pixel.red * 0.2990 + pixel.green * 0.5870 + pixel.blue * 0.1140;
 
  pixel.red = l;
  pixel.green = l;
  pixel.blue = l;
}
 
 
}//end of namespace eunomia
 
 
#include "ibuf_blt.h"
#include "ibuf_draw.h"
 
 
#endif // INCLUDE_GUARD_EUNOMIA_IMAGEBUFFER_H