8bpp_simple.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 "../zoom_func.h"
#include "8bpp_simple.hpp"
 
#include "../safeguards.h"
 
static FBlitter_8bppSimple iFBlitter_8bppSimple;
 
void Blitter_8bppSimple::Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom)
{
  const uint8_t *src, *src_line;
  uint8_t *dst, *dst_line;
 
  /* Find where to start reading in the source sprite */
  src_line = (const uint8_t *)bp->sprite + (bp->skip_top * bp->sprite_width + bp->skip_left) * ScaleByZoom(1, zoom);
  dst_line = (uint8_t *)bp->dst + bp->top * bp->pitch + bp->left;
 
  for (int y = 0; y < bp->height; y++) {
    dst = dst_line;
    dst_line += bp->pitch;
 
    src = src_line;
    src_line += bp->sprite_width * ScaleByZoom(1, zoom);
 
    for (int x = 0; x < bp->width; x++) {
      uint colour = 0;
 
      switch (mode) {
        case BM_COLOUR_REMAP:
        case BM_CRASH_REMAP:
          colour = bp->remap[*src];
          break;
 
        case BM_TRANSPARENT:
        case BM_TRANSPARENT_REMAP:
          if (*src != 0) colour = bp->remap[*dst];
          break;
 
        case BM_BLACK_REMAP:
          if (*src != 0) *dst = 0;
          break;
 
        default:
          colour = *src;
          break;
      }
      if (colour != 0) *dst = colour;
      dst++;
      src += ScaleByZoom(1, zoom);
    }
  }
}
 
Sprite *Blitter_8bppSimple::Encode(const SpriteLoader::SpriteCollection &sprite, SpriteAllocator &allocator)
{
  Sprite *dest_sprite;
  dest_sprite = allocator.Allocate<Sprite>(sizeof(*dest_sprite) + static_cast<size_t>(sprite[ZOOM_LVL_MIN].height) * static_cast<size_t>(sprite[ZOOM_LVL_MIN].width));
 
  dest_sprite->height = sprite[ZOOM_LVL_MIN].height;
  dest_sprite->width  = sprite[ZOOM_LVL_MIN].width;
  dest_sprite->x_offs = sprite[ZOOM_LVL_MIN].x_offs;
  dest_sprite->y_offs = sprite[ZOOM_LVL_MIN].y_offs;
 
  /* Copy over only the 'remap' channel, as that is what we care about in 8bpp */
  for (int i = 0; i < sprite[ZOOM_LVL_MIN].height * sprite[ZOOM_LVL_MIN].width; i++) {
    dest_sprite->data[i] = sprite[ZOOM_LVL_MIN].data[i].m;
  }
 
  return dest_sprite;
}