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/* $Id$ */

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#include "../stdafx.h"

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#include "../gfx_func.h"

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#include "8bpp_base.hpp"

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void Blitter_8bppBase::DrawColorMappingRect(void *dst, int width, int height, int pal)

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{

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	const uint8 *ctab = GetNonSprite(pal) + 1;

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	do {

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		for (int i = 0; i != width; i++) *((uint8 *)dst + i) = ctab[((uint8 *)dst)[i]];

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		dst = (uint8 *)dst + _screen.pitch;

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	} while (--height);

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}

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void *Blitter_8bppBase::MoveTo(const void *video, int x, int y)

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{

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	return (uint8 *)video + x + y * _screen.pitch;

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}

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void Blitter_8bppBase::SetPixel(void *video, int x, int y, uint8 color)

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{

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	*((uint8 *)video + x + y * _screen.pitch) = color;

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}

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void Blitter_8bppBase::SetPixelIfEmpty(void *video, int x, int y, uint8 color)

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{

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	uint8 *dst = (uint8 *)video + x + y * _screen.pitch;

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

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}

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void Blitter_8bppBase::DrawRect(void *video, int width, int height, uint8 color)

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{

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	do {

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		memset(video, color, width);

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		video = (uint8 *)video + _screen.pitch;

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	} while (--height);

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}

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void Blitter_8bppBase::DrawLine(void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8 color)

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{

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	int dy;

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	int dx;

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	int stepx;

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	int stepy;

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	int frac;

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	dy = (y2 - y) * 2;

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	if (dy < 0) {

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		dy = -dy;

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		stepy = -1;

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	} else {

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		stepy = 1;

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	}

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	dx = (x2 - x) * 2;

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	if (dx < 0) {

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		dx = -dx;

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		stepx = -1;

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	} else {

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		stepx = 1;

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	}

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	if (x >= 0 && y >= 0 && x < screen_width && y < screen_height) this->SetPixel(video, x, y, color);

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	if (dx > dy) {

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		frac = dy - (dx / 2);

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		while (x != x2) {

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			if (frac >= 0) {

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				y += stepy;

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				frac -= dx;

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			}

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			x += stepx;

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			frac += dy;

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			if (x >= 0 && y >= 0 && x < screen_width && y < screen_height) this->SetPixel(video, x, y, color);

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		}

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	} else {

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		frac = dx - (dy / 2);

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		while (y != y2) {

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			if (frac >= 0) {

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				x += stepx;

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				frac -= dy;

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			}

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			y += stepy;

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			frac += dx;

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			if (x >= 0 && y >= 0 && x < screen_width && y < screen_height) this->SetPixel(video, x, y, color);

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		}

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	}

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}

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void Blitter_8bppBase::CopyFromBuffer(void *video, const void *src, int width, int height)

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{

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	uint8 *dst = (uint8 *)video;

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	uint8 *usrc = (uint8 *)src;

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	for (; height > 0; height--) {

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		memcpy(dst, usrc, width * sizeof(uint8));

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		usrc += width;

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		dst += _screen.pitch;

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	}

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}

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void Blitter_8bppBase::CopyToBuffer(const void *video, void *dst, int width, int height)

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{

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	uint8 *udst = (uint8 *)dst;

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	uint8 *src = (uint8 *)video;

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	for (; height > 0; height--) {

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		memcpy(udst, src, width * sizeof(uint8));

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		src += _screen.pitch;

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		udst += width;

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	}

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}

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void Blitter_8bppBase::CopyImageToBuffer(const void *video, void *dst, int width, int height, int dst_pitch)

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{

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	uint8 *udst = (uint8 *)dst;

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	uint8 *src = (uint8 *)video;

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	for (; height > 0; height--) {

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		memcpy(udst, src, width * sizeof(uint8));

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		src += _screen.pitch;

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		udst += dst_pitch;

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	}

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}

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void Blitter_8bppBase::ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y)

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{

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	const uint8 *src;

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	uint8 *dst;

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	if (scroll_y > 0) {

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		/*Calculate pointers */

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		dst = (uint8 *)video + left + (top + height - 1) * _screen.pitch;

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		src = dst - scroll_y * _screen.pitch;

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		/* Decrease height and increase top */

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		top += scroll_y;

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		height -= scroll_y;

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		assert(height > 0);

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		/* Adjust left & width */

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		if (scroll_x >= 0) {

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			dst += scroll_x;

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			left += scroll_x;

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			width -= scroll_x;

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		} else {

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			src -= scroll_x;

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			width += scroll_x;

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		}

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		for (int h = height; h > 0; h--) {

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			memcpy(dst, src, width * sizeof(uint8));

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			src -= _screen.pitch;

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			dst -= _screen.pitch;

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		}

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	} else {

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		/* Calculate pointers */

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		dst = (uint8 *)video + left + top * _screen.pitch;

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		src = dst - scroll_y * _screen.pitch;

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		/* Decrese height. (scroll_y is <=0). */

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		height += scroll_y;

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		assert(height > 0);

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		/* Adjust left & width */

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		if (scroll_x >= 0) {

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			dst += scroll_x;

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			left += scroll_x;

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			width -= scroll_x;

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		} else {

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			src -= scroll_x;

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			width += scroll_x;

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		}

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		/* the y-displacement may be 0 therefore we have to use memmove,

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		 * because source and destination may overlap */

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		for (int h = height; h > 0; h--) {

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			memmove(dst, src, width * sizeof(uint8));

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			src += _screen.pitch;

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			dst += _screen.pitch;

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		}

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	}

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}

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int Blitter_8bppBase::BufferSize(int width, int height)

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{

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	return width * height;

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}

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void Blitter_8bppBase::PaletteAnimate(uint start, uint count)

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{

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	/* Video backend takes care of the palette animation */

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}

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Blitter::PaletteAnimation Blitter_8bppBase::UsePaletteAnimation()

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{

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	return Blitter::PALETTE_ANIMATION_VIDEO_BACKEND;

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}