glx@9627: /* $Id$ */
glx@9627: 
rubidium@10455: /** @file 8bpp_simple.cpp Implementation of the simple 8 bpp blitter. */
glx@9627: 
glx@9627: #include "../stdafx.h"
rubidium@9723: #include "../zoom_func.h"
glx@9627: #include "8bpp_simple.hpp"
glx@9627: 
glx@9627: static FBlitter_8bppSimple iFBlitter_8bppSimple;
glx@9627: 
glx@9627: void Blitter_8bppSimple::Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom)
glx@9627: {
rubidium@9628: 	const uint8 *src, *src_line;
rubidium@9628: 	uint8 *dst, *dst_line;
glx@9627: 
glx@9627: 	/* Find where to start reading in the source sprite */
rubidium@9628: 	src_line = (const uint8 *)bp->sprite + (bp->skip_top * bp->sprite_width + bp->skip_left) * ScaleByZoom(1, zoom);
rubidium@9628: 	dst_line = (uint8 *)bp->dst + bp->top * bp->pitch + bp->left;
glx@9627: 
glx@9627: 	for (int y = 0; y < bp->height; y++) {
glx@9627: 		dst = dst_line;
glx@9627: 		dst_line += bp->pitch;
glx@9627: 
glx@9627: 		src = src_line;
glx@9627: 		src_line += bp->sprite_width * ScaleByZoom(1, zoom);
glx@9627: 
glx@9627: 		for (int x = 0; x < bp->width; x++) {
glx@9627: 			uint color = 0;
glx@9627: 
glx@9627: 			switch (mode) {
glx@9627: 				case BM_COLOUR_REMAP:
glx@9627: 					color = bp->remap[*src];
glx@9627: 					break;
glx@9627: 
glx@9627: 				case BM_TRANSPARENT:
glx@9627: 					if (*src != 0) color = bp->remap[*dst];
glx@9627: 					break;
glx@9627: 
glx@9627: 				default:
glx@9627: 					color = *src;
glx@9627: 					break;
glx@9627: 			}
glx@9627: 			if (color != 0) *dst = color;
glx@9627: 			dst++;
glx@9627: 			src += ScaleByZoom(1, zoom);
glx@9627: 		}
glx@9627: 	}
glx@9627: }
glx@9627: 
glx@9627: Sprite *Blitter_8bppSimple::Encode(SpriteLoader::Sprite *sprite, Blitter::AllocatorProc *allocator)
glx@9627: {
glx@9627: 	Sprite *dest_sprite;
glx@9627: 	dest_sprite = (Sprite *)allocator(sizeof(*dest_sprite) + sprite->height * sprite->width);;
glx@9627: 
glx@9627: 	dest_sprite->height = sprite->height;
glx@9627: 	dest_sprite->width  = sprite->width;
glx@9627: 	dest_sprite->x_offs = sprite->x_offs;
glx@9627: 	dest_sprite->y_offs = sprite->y_offs;
glx@9627: 
glx@9627: 	/* Copy over only the 'remap' channel, as that is what we care about in 8bpp */
glx@9627: 	for (int i = 0; i < sprite->height * sprite->width; i++) {
glx@9627: 		dest_sprite->data[i] = sprite->data[i].m;
glx@9627: 	}
glx@9627: 
glx@9627: 	return dest_sprite;
glx@9627: }