smatz@8091: /* $Id$ */
smatz@8091: 
rubidium@9111: /** @file 8bpp_base.cpp Implementation of the base for all 8 bpp blitters. */
rubidium@9111: 
truelight@6937: #include "../stdafx.h"
rubidium@8123: #include "../gfx_func.h"
truelight@6937: #include "8bpp_base.hpp"
truelight@6937: 
truelight@6937: void Blitter_8bppBase::DrawColorMappingRect(void *dst, int width, int height, int pal)
truelight@6937: {
rubidium@10056: 	const uint8 *ctab = GetNonSprite(pal, ST_RECOLOUR) + 1;
truelight@6937: 
truelight@6937: 	do {
truelight@6937: 		for (int i = 0; i != width; i++) *((uint8 *)dst + i) = ctab[((uint8 *)dst)[i]];
truelight@6937: 		dst = (uint8 *)dst + _screen.pitch;
truelight@6958: 	} while (--height);
truelight@6937: }
truelight@6937: 
truelight@6937: void *Blitter_8bppBase::MoveTo(const void *video, int x, int y)
truelight@6937: {
truelight@6937: 	return (uint8 *)video + x + y * _screen.pitch;
truelight@6937: }
truelight@6937: 
truelight@6937: void Blitter_8bppBase::SetPixel(void *video, int x, int y, uint8 color)
truelight@6937: {
truelight@6937: 	*((uint8 *)video + x + y * _screen.pitch) = color;
truelight@6937: }
truelight@6937: 
truelight@6937: void Blitter_8bppBase::SetPixelIfEmpty(void *video, int x, int y, uint8 color)
truelight@6937: {
truelight@6937: 	uint8 *dst = (uint8 *)video + x + y * _screen.pitch;
truelight@6937: 	if (*dst == 0) *dst = color;
truelight@6937: }
truelight@6937: 
peter1138@6947: void Blitter_8bppBase::DrawRect(void *video, int width, int height, uint8 color)
truelight@6937: {
peter1138@6947: 	do {
peter1138@6947: 		memset(video, color, width);
peter1138@6947: 		video = (uint8 *)video + _screen.pitch;
peter1138@6947: 	} while (--height);
truelight@6937: }
truelight@6937: 
truelight@6948: void Blitter_8bppBase::DrawLine(void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8 color)
truelight@6948: {
truelight@6948: 	int dy;
truelight@6948: 	int dx;
truelight@6948: 	int stepx;
truelight@6948: 	int stepy;
truelight@6948: 	int frac;
truelight@6948: 
truelight@6948: 	dy = (y2 - y) * 2;
truelight@6948: 	if (dy < 0) {
truelight@6948: 		dy = -dy;
truelight@6948: 		stepy = -1;
truelight@6948: 	} else {
truelight@6948: 		stepy = 1;
truelight@6948: 	}
truelight@6948: 
truelight@6948: 	dx = (x2 - x) * 2;
truelight@6948: 	if (dx < 0) {
truelight@6948: 		dx = -dx;
truelight@6948: 		stepx = -1;
truelight@6948: 	} else {
truelight@6948: 		stepx = 1;
truelight@6948: 	}
truelight@6948: 
rubidium@7638: 	if (x >= 0 && y >= 0 && x < screen_width && y < screen_height) this->SetPixel(video, x, y, color);
truelight@6948: 	if (dx > dy) {
truelight@6948: 		frac = dy - (dx / 2);
truelight@6948: 		while (x != x2) {
truelight@6948: 			if (frac >= 0) {
truelight@6948: 				y += stepy;
truelight@6948: 				frac -= dx;
truelight@6948: 			}
truelight@6948: 			x += stepx;
truelight@6948: 			frac += dy;
rubidium@7638: 			if (x >= 0 && y >= 0 && x < screen_width && y < screen_height) this->SetPixel(video, x, y, color);
truelight@6948: 		}
truelight@6948: 	} else {
truelight@6948: 		frac = dx - (dy / 2);
truelight@6948: 		while (y != y2) {
truelight@6948: 			if (frac >= 0) {
truelight@6948: 				x += stepx;
truelight@6948: 				frac -= dy;
truelight@6948: 			}
truelight@6948: 			y += stepy;
truelight@6948: 			frac += dx;
rubidium@7638: 			if (x >= 0 && y >= 0 && x < screen_width && y < screen_height) this->SetPixel(video, x, y, color);
truelight@6948: 		}
truelight@6948: 	}
truelight@6948: }
truelight@6948: 
truelight@6985: void Blitter_8bppBase::CopyFromBuffer(void *video, const void *src, int width, int height)
truelight@6937: {
truelight@6937: 	uint8 *dst = (uint8 *)video;
truelight@6937: 	uint8 *usrc = (uint8 *)src;
truelight@6937: 
truelight@6937: 	for (; height > 0; height--) {
truelight@6985: 		memcpy(dst, usrc, width * sizeof(uint8));
truelight@6985: 		usrc += width;
truelight@6985: 		dst += _screen.pitch;
truelight@6937: 	}
truelight@6937: }
truelight@6937: 
truelight@6985: void Blitter_8bppBase::CopyToBuffer(const void *video, void *dst, int width, int height)
truelight@6937: {
truelight@6937: 	uint8 *udst = (uint8 *)dst;
truelight@6937: 	uint8 *src = (uint8 *)video;
truelight@6937: 
truelight@6937: 	for (; height > 0; height--) {
truelight@6985: 		memcpy(udst, src, width * sizeof(uint8));
truelight@6985: 		src += _screen.pitch;
truelight@6985: 		udst += width;
truelight@6937: 	}
truelight@6937: }
truelight@6937: 
truelight@6985: void Blitter_8bppBase::CopyImageToBuffer(const void *video, void *dst, int width, int height, int dst_pitch)
truelight@6937: {
truelight@6985: 	uint8 *udst = (uint8 *)dst;
truelight@6985: 	uint8 *src = (uint8 *)video;
truelight@6937: 
truelight@6937: 	for (; height > 0; height--) {
truelight@6985: 		memcpy(udst, src, width * sizeof(uint8));
truelight@6937: 		src += _screen.pitch;
truelight@6985: 		udst += dst_pitch;
truelight@6937: 	}
truelight@6937: }
truelight@6937: 
truelight@6951: void Blitter_8bppBase::ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y)
truelight@6951: {
truelight@6951: 	const uint8 *src;
truelight@6951: 	uint8 *dst;
truelight@6951: 
truelight@6951: 	if (scroll_y > 0) {
truelight@6951: 		/*Calculate pointers */
truelight@6951: 		dst = (uint8 *)video + left + (top + height - 1) * _screen.pitch;
truelight@6951: 		src = dst - scroll_y * _screen.pitch;
truelight@6951: 
truelight@6951: 		/* Decrease height and increase top */
truelight@6951: 		top += scroll_y;
truelight@6951: 		height -= scroll_y;
truelight@6951: 		assert(height > 0);
truelight@6951: 
truelight@6951: 		/* Adjust left & width */
truelight@6951: 		if (scroll_x >= 0) {
truelight@6951: 			dst += scroll_x;
truelight@6951: 			left += scroll_x;
truelight@6951: 			width -= scroll_x;
truelight@6951: 		} else {
truelight@6951: 			src -= scroll_x;
truelight@6951: 			width += scroll_x;
truelight@6951: 		}
truelight@6951: 
truelight@6985: 		for (int h = height; h > 0; h--) {
truelight@6985: 			memcpy(dst, src, width * sizeof(uint8));
truelight@6985: 			src -= _screen.pitch;
truelight@6985: 			dst -= _screen.pitch;
truelight@6985: 		}
truelight@6951: 	} else {
truelight@6951: 		/* Calculate pointers */
truelight@6951: 		dst = (uint8 *)video + left + top * _screen.pitch;
truelight@6951: 		src = dst - scroll_y * _screen.pitch;
truelight@6951: 
truelight@6951: 		/* Decrese height. (scroll_y is <=0). */
truelight@6951: 		height += scroll_y;
truelight@6951: 		assert(height > 0);
truelight@6951: 
truelight@6951: 		/* Adjust left & width */
truelight@6951: 		if (scroll_x >= 0) {
truelight@6951: 			dst += scroll_x;
truelight@6951: 			left += scroll_x;
truelight@6951: 			width -= scroll_x;
truelight@6951: 		} else {
truelight@6951: 			src -= scroll_x;
truelight@6951: 			width += scroll_x;
truelight@6951: 		}
truelight@6951: 
truelight@6951: 		/* the y-displacement may be 0 therefore we have to use memmove,
truelight@6951: 		 * because source and destination may overlap */
truelight@6985: 		for (int h = height; h > 0; h--) {
truelight@6985: 			memmove(dst, src, width * sizeof(uint8));
truelight@6985: 			src += _screen.pitch;
truelight@6985: 			dst += _screen.pitch;
truelight@6985: 		}
truelight@6951: 	}
truelight@6951: }
truelight@6951: 
truelight@6937: int Blitter_8bppBase::BufferSize(int width, int height)
truelight@6937: {
truelight@6937: 	return width * height;
truelight@6937: }
truelight@6960: 
truelight@6960: void Blitter_8bppBase::PaletteAnimate(uint start, uint count)
truelight@6960: {
truelight@6960: 	/* Video backend takes care of the palette animation */
truelight@6960: }
truelight@6960: 
truelight@6960: Blitter::PaletteAnimation Blitter_8bppBase::UsePaletteAnimation()
truelight@6960: {
truelight@6960: 	return Blitter::PALETTE_ANIMATION_VIDEO_BACKEND;
truelight@6960: }