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/* $Id$ */

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/** @file 8bpp_simple.cpp Implementation of the simple 8 bpp blitter. */

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#include "../stdafx.h"

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#include "../zoom_func.h"

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#include "8bpp_simple.hpp"

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static FBlitter_8bppSimple iFBlitter_8bppSimple;

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void Blitter_8bppSimple::Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom)

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{

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	const uint8 *src, *src_line;

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	uint8 *dst, *dst_line;

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	/* Find where to start reading in the source sprite */

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	src_line = (const uint8 *)bp->sprite + (bp->skip_top * bp->sprite_width + bp->skip_left) * ScaleByZoom(1, zoom);

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	dst_line = (uint8 *)bp->dst + bp->top * bp->pitch + bp->left;

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	for (int y = 0; y < bp->height; y++) {

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		dst = dst_line;

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		dst_line += bp->pitch;

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		src = src_line;

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		src_line += bp->sprite_width * ScaleByZoom(1, zoom);

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		for (int x = 0; x < bp->width; x++) {

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			uint color = 0;

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			switch (mode) {

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				case BM_COLOUR_REMAP:

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					color = bp->remap[*src];

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					break;

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				case BM_TRANSPARENT:

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					if (*src != 0) color = bp->remap[*dst];

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					break;

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				default:

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					color = *src;

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					break;

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			}

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			if (color != 0) *dst = color;

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			dst++;

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			src += ScaleByZoom(1, zoom);

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		}

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	}

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}

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Sprite *Blitter_8bppSimple::Encode(SpriteLoader::Sprite *sprite, Blitter::AllocatorProc *allocator)

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{

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	Sprite *dest_sprite;

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	dest_sprite = (Sprite *)allocator(sizeof(*dest_sprite) + sprite->height * sprite->width);;

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	dest_sprite->height = sprite->height;

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	dest_sprite->width  = sprite->width;

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	dest_sprite->x_offs = sprite->x_offs;

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	dest_sprite->y_offs = sprite->y_offs;

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	/* Copy over only the 'remap' channel, as that is what we care about in 8bpp */

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	for (int i = 0; i < sprite->height * sprite->width; i++) {

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		dest_sprite->data[i] = sprite->data[i].m;

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	}

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	return dest_sprite;

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}