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