32bpp_simple.cpp

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00001 /* $Id: 32bpp_simple.cpp 18873 2010-01-21 01:44:51Z rubidium $ */
00002 
00003 /*
00004  * This file is part of OpenTTD.
00005  * 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.
00006  * 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.
00007  * 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/>.
00008  */
00009 
00012 #include "../stdafx.h"
00013 #include "../zoom_func.h"
00014 #include "32bpp_simple.hpp"
00015 
00016 #include "../table/sprites.h"
00017 
00018 static FBlitter_32bppSimple iFBlitter_32bppSimple;
00019 
00020 void Blitter_32bppSimple::Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom)
00021 {
00022   const SpriteLoader::CommonPixel *src, *src_line;
00023   uint32 *dst, *dst_line;
00024 
00025   /* Find where to start reading in the source sprite */
00026   src_line = (const SpriteLoader::CommonPixel *)bp->sprite + (bp->skip_top * bp->sprite_width + bp->skip_left) * ScaleByZoom(1, zoom);
00027   dst_line = (uint32 *)bp->dst + bp->top * bp->pitch + bp->left;
00028 
00029   for (int y = 0; y < bp->height; y++) {
00030     dst = dst_line;
00031     dst_line += bp->pitch;
00032 
00033     src = src_line;
00034     src_line += bp->sprite_width * ScaleByZoom(1, zoom);
00035 
00036     for (int x = 0; x < bp->width; x++) {
00037       switch (mode) {
00038         case BM_COLOUR_REMAP:
00039           /* In case the m-channel is zero, do not remap this pixel in any way */
00040           if (src->m == 0) {
00041             if (src->a != 0) *dst = ComposeColourRGBA(src->r, src->g, src->b, src->a, *dst);
00042           } else {
00043             if (bp->remap[src->m] != 0) *dst = ComposeColourPA(this->LookupColourInPalette(bp->remap[src->m]), src->a, *dst);
00044           }
00045           break;
00046 
00047         case BM_TRANSPARENT:
00048           /* TODO -- We make an assumption here that the remap in fact is transparency, not some colour.
00049            *  This is never a problem with the code we produce, but newgrfs can make it fail... or at least:
00050            *  we produce a result the newgrf maker didn't expect ;) */
00051 
00052           /* Make the current colour a bit more black, so it looks like this image is transparent */
00053           if (src->a != 0) *dst = MakeTransparent(*dst, 192);
00054           break;
00055 
00056         default:
00057           if (src->a != 0) *dst = ComposeColourRGBA(src->r, src->g, src->b, src->a, *dst);
00058           break;
00059       }
00060       dst++;
00061       src += ScaleByZoom(1, zoom);
00062     }
00063   }
00064 }
00065 
00066 void Blitter_32bppSimple::DrawColourMappingRect(void *dst, int width, int height, PaletteID pal)
00067 {
00068   uint32 *udst = (uint32 *)dst;
00069 
00070   if (pal == PALETTE_TO_TRANSPARENT) {
00071     do {
00072       for (int i = 0; i != width; i++) {
00073         *udst = MakeTransparent(*udst, 154);
00074         udst++;
00075       }
00076       udst = udst - width + _screen.pitch;
00077     } while (--height);
00078     return;
00079   }
00080   if (pal == PALETTE_TO_STRUCT_GREY) {
00081     do {
00082       for (int i = 0; i != width; i++) {
00083         *udst = MakeGrey(*udst);
00084         udst++;
00085       }
00086       udst = udst - width + _screen.pitch;
00087     } while (--height);
00088     return;
00089   }
00090 
00091   DEBUG(misc, 0, "32bpp blitter doesn't know how to draw this colour table ('%d')", pal);
00092 }
00093 
00094 Sprite *Blitter_32bppSimple::Encode(SpriteLoader::Sprite *sprite, Blitter::AllocatorProc *allocator)
00095 {
00096   Sprite *dest_sprite;
00097   SpriteLoader::CommonPixel *dst;
00098   dest_sprite = (Sprite *)allocator(sizeof(*dest_sprite) + sprite->height * sprite->width * sizeof(SpriteLoader::CommonPixel));
00099 
00100   dest_sprite->height = sprite->height;
00101   dest_sprite->width  = sprite->width;
00102   dest_sprite->x_offs = sprite->x_offs;
00103   dest_sprite->y_offs = sprite->y_offs;
00104 
00105   dst = (SpriteLoader::CommonPixel *)dest_sprite->data;
00106 
00107   memcpy(dst, sprite->data, sprite->height * sprite->width * sizeof(SpriteLoader::CommonPixel));
00108   for (int i = 0; i < sprite->height * sprite->width; i++) {
00109     if (dst[i].m != 0) {
00110       /* Pre-convert the mapping channel to a RGB value */
00111       uint colour = this->LookupColourInPalette(dst[i].m);
00112       dst[i].r = GB(colour, 16, 8);
00113       dst[i].g = GB(colour, 8,  8);
00114       dst[i].b = GB(colour, 0,  8);
00115     }
00116   }
00117 
00118   return dest_sprite;
00119 }

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