8bpp_base.cpp

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/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */
 
#include "../stdafx.h"
#include "../gfx_func.h"
#include "8bpp_base.hpp"
#include "common.hpp"
 
#include "../safeguards.h"
 
void Blitter_8bppBase::DrawColourMappingRect(void *dst, int width, int height, PaletteID pal)
{
  const uint8_t *ctab = GetNonSprite(pal, SpriteType::Recolour) + 1;
 
  do {
    for (int i = 0; i != width; i++) *((uint8_t *)dst + i) = ctab[((uint8_t *)dst)[i]];
    dst = (uint8_t *)dst + _screen.pitch;
  } while (--height);
}
 
void *Blitter_8bppBase::MoveTo(void *video, int x, int y)
{
  return (uint8_t *)video + x + y * _screen.pitch;
}
 
void Blitter_8bppBase::SetPixel(void *video, int x, int y, uint8_t colour)
{
  *((uint8_t *)video + x + y * _screen.pitch) = colour;
}
 
void Blitter_8bppBase::DrawLine(void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8_t colour, int width, int dash)
{
  this->DrawLineGeneric(x, y, x2, y2, screen_width, screen_height, width, dash, [=](int x, int y) {
    *((uint8_t *)video + x + y * _screen.pitch) = colour;
  });
}
 
void Blitter_8bppBase::DrawRect(void *video, int width, int height, uint8_t colour)
{
  do {
    memset(video, colour, width);
    video = (uint8_t *)video + _screen.pitch;
  } while (--height);
}
 
void Blitter_8bppBase::CopyFromBuffer(void *video, const void *src, int width, int height)
{
  uint8_t *dst = (uint8_t *)video;
  const uint8_t *usrc = (const uint8_t *)src;
 
  for (; height > 0; height--) {
    memcpy(dst, usrc, width * sizeof(uint8_t));
    usrc += width;
    dst += _screen.pitch;
  }
}
 
void Blitter_8bppBase::CopyToBuffer(const void *video, void *dst, int width, int height)
{
  uint8_t *udst = (uint8_t *)dst;
  const uint8_t *src = (const uint8_t *)video;
 
  for (; height > 0; height--) {
    memcpy(udst, src, width * sizeof(uint8_t));
    src += _screen.pitch;
    udst += width;
  }
}
 
void Blitter_8bppBase::CopyImageToBuffer(const void *video, void *dst, int width, int height, int dst_pitch)
{
  uint8_t *udst = (uint8_t *)dst;
  const uint8_t *src = (const uint8_t *)video;
 
  for (; height > 0; height--) {
    memcpy(udst, src, width * sizeof(uint8_t));
    src += _screen.pitch;
    udst += dst_pitch;
  }
}
 
void Blitter_8bppBase::ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y)
{
  const uint8_t *src;
  uint8_t *dst;
 
  if (scroll_y > 0) {
    /* Calculate pointers */
    dst = (uint8_t *)video + left + (top + height - 1) * _screen.pitch;
    src = dst - scroll_y * _screen.pitch;
 
    /* Decrease height and increase top */
    top += scroll_y;
    height -= scroll_y;
    assert(height > 0);
 
    /* Adjust left & width */
    if (scroll_x >= 0) {
      dst += scroll_x;
      left += scroll_x;
      width -= scroll_x;
    } else {
      src -= scroll_x;
      width += scroll_x;
    }
 
    for (int h = height; h > 0; h--) {
      memcpy(dst, src, width * sizeof(uint8_t));
      src -= _screen.pitch;
      dst -= _screen.pitch;
    }
  } else {
    /* Calculate pointers */
    dst = (uint8_t *)video + left + top * _screen.pitch;
    src = dst - scroll_y * _screen.pitch;
 
    /* Decrease height. (scroll_y is <=0). */
    height += scroll_y;
    assert(height > 0);
 
    /* Adjust left & width */
    if (scroll_x >= 0) {
      dst += scroll_x;
      left += scroll_x;
      width -= scroll_x;
    } else {
      src -= scroll_x;
      width += scroll_x;
    }
 
    /* the y-displacement may be 0 therefore we have to use memmove,
     * because source and destination may overlap */
    for (int h = height; h > 0; h--) {
      memmove(dst, src, width * sizeof(uint8_t));
      src += _screen.pitch;
      dst += _screen.pitch;
    }
  }
}
 
size_t Blitter_8bppBase::BufferSize(uint width, uint height)
{
  return static_cast<size_t>(width) * height;
}
 
void Blitter_8bppBase::PaletteAnimate(const Palette &)
{
  /* Video backend takes care of the palette animation */
}
 
Blitter::PaletteAnimation Blitter_8bppBase::UsePaletteAnimation()
{
  return Blitter::PALETTE_ANIMATION_VIDEO_BACKEND;
}