32bpp_simple.cpp

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/* $Id: 32bpp_simple.cpp 12971 2008-05-06 15:11:33Z rubidium $ */

#include "../stdafx.h"
#include "../gfx_func.h"
#include "../zoom_func.h"
#include "../debug.h"
#include "32bpp_simple.hpp"

#include "../table/sprites.h"

static FBlitter_32bppSimple iFBlitter_32bppSimple;

void Blitter_32bppSimple::Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom)
{
  const SpriteLoader::CommonPixel *src, *src_line;
  uint32 *dst, *dst_line;

  /* Find where to start reading in the source sprite */
  src_line = (const SpriteLoader::CommonPixel *)bp->sprite + (bp->skip_top * bp->sprite_width + bp->skip_left) * ScaleByZoom(1, zoom);
  dst_line = (uint32 *)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->LookupColourInPalette(bp->remap[src->m]), src->a, *dst);
          }
          break;

        case BM_TRANSPARENT:
          /* TODO -- We make an assumption here that the remap in fact is transparency, not some color.
           *  This is never a problem with the code we produce, but newgrfs can make it fail... or at least:
           *  we produce a result the newgrf maker didn't expect ;) */

          /* Make the current color a bit more black, so it looks like this image is transparent */
          if (src->a != 0) *dst = MakeTransparent(*dst, 192);
          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::DrawColorMappingRect(void *dst, int width, int height, int pal)
{
  uint32 *udst = (uint32 *)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_TO_STRUCT_GREY) {
    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 color table ('%d')", pal);
}

Sprite *Blitter_32bppSimple::Encode(SpriteLoader::Sprite *sprite, Blitter::AllocatorProc *allocator)
{
  Sprite *dest_sprite;
  SpriteLoader::CommonPixel *dst;
  dest_sprite = (Sprite *)allocator(sizeof(*dest_sprite) + sprite->height * sprite->width * sizeof(SpriteLoader::CommonPixel));

  dest_sprite->height = sprite->height;
  dest_sprite->width  = sprite->width;
  dest_sprite->x_offs = sprite->x_offs;
  dest_sprite->y_offs = sprite->y_offs;

  dst = (SpriteLoader::CommonPixel *)dest_sprite->data;

  memcpy(dst, sprite->data, sprite->height * sprite->width * sizeof(SpriteLoader::CommonPixel));
  for (int i = 0; i < sprite->height * sprite->width; i++) {
    if (dst[i].m != 0) {
      /* Pre-convert the mapping channel to a RGB value */
      uint color = this->LookupColourInPalette(dst[i].m);
      dst[i].r = GB(color, 16, 8);
      dst[i].g = GB(color, 8,  8);
      dst[i].b = GB(color, 0,  8);
    }
  }

  return dest_sprite;
}