32bpp_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 "../palette_func.h"
#include "32bpp_simple.hpp"
 
#include "../table/sprites.h"
 
#include "../safeguards.h"
 
static FBlitter_32bppSimple iFBlitter_32bppSimple;
 
void Blitter_32bppSimple::Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom)
{
  const Blitter_32bppSimple::Pixel *src, *src_line;
  Colour *dst, *dst_line;
 
  /* Find where to start reading in the source sprite */
  src_line = (const Blitter_32bppSimple::Pixel *)bp->sprite + (bp->skip_top * bp->sprite_width + bp->skip_left) * ScaleByZoom(1, zoom);
  dst_line = (Colour *)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++) {
      switch (mode) {
        case BM_COLOUR_REMAP:
          /* In case the m-channel is zero, do not remap this pixel in any way */
          if (src->m == 0) {
            if (src->a != 0) *dst = ComposeColourRGBA(src->r, src->g, src->b, src->a, *dst);
          } else {
            if (bp->remap[src->m] != 0) *dst = ComposeColourPA(this->AdjustBrightness(this->LookupColourInPalette(bp->remap[src->m]), src->v), src->a, *dst);
          }
          break;
 
        case BM_CRASH_REMAP:
          if (src->m == 0) {
            if (src->a != 0) {
              uint8_t g = MakeDark(src->r, src->g, src->b);
              *dst = ComposeColourRGBA(g, g, g, src->a, *dst);
            }
          } else {
            if (bp->remap[src->m] != 0) *dst = ComposeColourPA(this->AdjustBrightness(this->LookupColourInPalette(bp->remap[src->m]), src->v), src->a, *dst);
          }
          break;
 
        case BM_BLACK_REMAP:
          if (src->a != 0) {
            *dst = Colour(0, 0, 0);
          }
          break;
 
        case BM_TRANSPARENT:
          /* Make the current colour a bit more black, so it looks like this image is transparent */
          if (src->a != 0) {
            *dst = MakeTransparent(*dst, 192);
          }
          break;
 
        case BM_TRANSPARENT_REMAP:
          /* Apply custom transparency remap. */
          if (src->a != 0) {
            *dst = this->LookupColourInPalette(bp->remap[GetNearestColourIndex(*dst)]);
          }
          break;
 
        default:
          if (src->a != 0) *dst = ComposeColourRGBA(src->r, src->g, src->b, src->a, *dst);
          break;
      }
      dst++;
      src += ScaleByZoom(1, zoom);
    }
  }
}
 
void Blitter_32bppSimple::DrawColourMappingRect(void *dst, int width, int height, PaletteID pal)
{
  Colour *udst = (Colour *)dst;
 
  if (pal == PALETTE_TO_TRANSPARENT) {
    do {
      for (int i = 0; i != width; i++) {
        *udst = MakeTransparent(*udst, 154);
        udst++;
      }
      udst = udst - width + _screen.pitch;
    } while (--height);
    return;
  }
  if (pal == PALETTE_NEWSPAPER) {
    do {
      for (int i = 0; i != width; i++) {
        *udst = MakeGrey(*udst);
        udst++;
      }
      udst = udst - width + _screen.pitch;
    } while (--height);
    return;
  }
 
  Debug(misc, 0, "32bpp blitter doesn't know how to draw this colour table ('{}')", pal);
}
 
Sprite *Blitter_32bppSimple::Encode(const SpriteLoader::SpriteCollection &sprite, SpriteAllocator &allocator)
{
  Blitter_32bppSimple::Pixel *dst;
  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) * sizeof(*dst));
 
  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;
 
  dst = (Blitter_32bppSimple::Pixel *)dest_sprite->data;
  SpriteLoader::CommonPixel *src = (SpriteLoader::CommonPixel *)sprite[ZOOM_LVL_MIN].data;
 
  for (int i = 0; i < sprite[ZOOM_LVL_MIN].height * sprite[ZOOM_LVL_MIN].width; i++) {
    if (src->m == 0) {
      dst[i].r = src->r;
      dst[i].g = src->g;
      dst[i].b = src->b;
      dst[i].a = src->a;
      dst[i].m = 0;
      dst[i].v = 0;
    } else {
      /* Get brightest value */
      uint8_t rgb_max = std::max({src->r, src->g, src->b});
 
      /* Black pixel (8bpp or old 32bpp image), so use default value */
      if (rgb_max == 0) rgb_max = DEFAULT_BRIGHTNESS;
      dst[i].v = rgb_max;
 
      /* Pre-convert the mapping channel to a RGB value */
      Colour colour = this->AdjustBrightness(this->LookupColourInPalette(src->m), dst[i].v);
      dst[i].r = colour.r;
      dst[i].g = colour.g;
      dst[i].b = colour.b;
      dst[i].a = src->a;
      dst[i].m = src->m;
    }
    src++;
  }
 
  return dest_sprite;
}