/* _fixup_loaded_bitmap:
* Helper function for adjusting the color depth of a loaded image.
* Converts the bitmap BMP to the color depth BPP. If BMP is a 8-bit
* bitmap, PAL must be the palette attached to the bitmap. If BPP is
* equal to 8, the conversion is performed either by building a palette
* optimized for the bitmap if PAL is not NULL (in which case PAL gets
* filled in with this palette) or by using the current palette if PAL
* is NULL. In any other cases, PAL is unused.
*/
BITMAP *_fixup_loaded_bitmap(BITMAP *bmp, PALETTE pal, int bpp)
{
BITMAP *b2;
ASSERT(bmp);
b2 = create_bitmap_ex(bpp, bmp->w, bmp->h);
if (!b2) {
destroy_bitmap(bmp);
return NULL;
}
if (bpp == 8) {
RGB_MAP *old_map = rgb_map;
if (pal)
generate_optimized_palette(bmp, pal, NULL);
else
pal = _current_palette;
rgb_map = _AL_MALLOC(sizeof(RGB_MAP));
if (rgb_map != NULL)
create_rgb_table(rgb_map, pal, NULL);
blit(bmp, b2, 0, 0, 0, 0, bmp->w, bmp->h);
if (rgb_map != NULL)
_AL_FREE(rgb_map);
rgb_map = old_map;
}
else if (bitmap_color_depth(bmp) == 8) {
select_palette(pal);
blit(bmp, b2, 0, 0, 0, 0, bmp->w, bmp->h);
unselect_palette();
}
else {
blit(bmp, b2, 0, 0, 0, 0, bmp->w, bmp->h);
}
destroy_bitmap(bmp);
return b2;
}
/* worker function for changing the color depth of bitmap data */
static int do_changedepth(DATAFILE *dat, int *param, int depth)
{
BITMAP *bmp, *bmp2;
RLE_SPRITE *spr;
RGB tmprgb = datedit_current_palette[0];
if ((dat->type != DAT_BITMAP) && (dat->type != DAT_RLE_SPRITE) &&
(dat->type != DAT_C_SPRITE) && (dat->type != DAT_XC_SPRITE)) {
(*param)++;
return D_O_K;
}
if (dat->type == DAT_RLE_SPRITE) {
spr = (RLE_SPRITE *)dat->dat;
if (spr->color_depth == depth)
return D_O_K;
bmp = create_bitmap_ex(spr->color_depth, spr->w, spr->h);
clear_to_color(bmp, bmp->vtable->mask_color);
draw_rle_sprite(bmp, spr, 0, 0);
bmp2 = create_bitmap_ex(depth, bmp->w, bmp->h);
datedit_current_palette[0].r = 63;
datedit_current_palette[0].g = 0;
datedit_current_palette[0].b = 63;
select_palette(datedit_current_palette);
blit(bmp, bmp2, 0, 0, 0, 0, bmp->w, bmp->h);
unselect_palette();
datedit_current_palette[0] = tmprgb;
dat->dat = get_rle_sprite(bmp2);
destroy_bitmap(bmp);
destroy_bitmap(bmp2);
destroy_rle_sprite(spr);
}
else {
bmp = (BITMAP *)dat->dat;
if (bitmap_color_depth(bmp) == depth)
return D_O_K;
bmp2 = create_bitmap_ex(depth, bmp->w, bmp->h);
if ((dat->type == DAT_C_SPRITE) || (dat->type == DAT_XC_SPRITE)) {
datedit_current_palette[0].r = 63;
datedit_current_palette[0].g = 0;
datedit_current_palette[0].b = 63;
}
select_palette(datedit_current_palette);
blit(bmp, bmp2, 0, 0, 0, 0, bmp->w, bmp->h);
unselect_palette();
datedit_current_palette[0] = tmprgb;
dat->dat = bmp2;
destroy_bitmap(bmp);
}
return D_REDRAW;
}
