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/***************************************************************************
SDLStretch.cpp - description
-------------------
begin : Thu Nov 11 1999
copyright : (C) 1999 by Alexander Pipelka
email : pipelka@teleweb.at
***************************************************************************/
/***************************************************************************
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
***************************************************************************/
#include "../global.h"
#include <stdio.h>
#include <cstring>
#include <math.h>
#include <stdlib.h>
#include "sdlstretch.h"
#define sign(x) ((x)>0 ? 1:-1)
template<class ST, class DT>
inline void StretchTemplateLUT(int x1, int x2, int y1, int y2, int yr, int yw, ST src_pixels, DT dst_pixels, Uint32* lut)
{
int dx,dy,e,d,dx2;
register Uint32 p;
dx=(x2-x1);
dy=(y2-y1);
dy<<=1;
e=dy-dx;
dx2=dx<<1;
for(d=0;d<=dx;d++)
{
p = lut[*src_pixels];
*dst_pixels++ = p;
while(e>=0)
{
src_pixels ++;
e-=dx2;
}
e+=dy;
}
}
template<class ST, class DT>
inline void StretchTemplate(int x1, int x2, int y1, int y2, int yr, int yw, ST src_pixels, DT dst_pixels)
{
int dx,dy,e,d,dx2;
dx=(x2-x1);
dy=(y2-y1);
dy<<=1;
e=dy-dx;
dx2=dx<<1;
for(d=0;d<=dx;d++)
{
*dst_pixels++ = *src_pixels;
while(e>=0)
{
src_pixels ++;
e-=dx2;
}
e+=dy;
}
}
template<class ST, class DT>
inline void RectStretchTemplate(SDL_Surface* src_surface, ST src, int xs1, int ys1, int xs2, int ys2, SDL_Surface* dst_surface, DT dst, int xd1, int yd1, int xd2, int yd2, Uint32* lutVOI)
{
int dx,dy,e,d,dx2;
dx=abs((int)(yd2-yd1));
dy=abs((int)(ys2-ys1));
e=(dy<<1)-dx;
dx2=dx<<1;
dy<<=1;
Uint16 src_pitch = src_surface->pitch;
Uint16 dst_pitch = dst_surface->pitch;
int src_bpp = src_surface->format->BytesPerPixel;
int dst_bpp = dst_surface->format->BytesPerPixel;
register long src_pixels = ((long)src + ys1*src_pitch + xs1 * src_bpp);
register long dst_pixels = ((long)dst + yd1*dst_pitch + xd1 * dst_bpp);
register Uint32* lut = lutVOI;
if(lut == NULL){ // Stretch without lookup table
for(d=0; (d<=dx) && (yd1<dst_surface->h); d++)
{
StretchTemplate(xd1,xd2,xs1,xs2,ys1,yd1, (ST)src_pixels, (DT)dst_pixels);
while(e>=0)
{
src_pixels += src_pitch;
ys1++;
e-=dx2;
}
dst_pixels += dst_pitch;
yd1++;
e+=dy;
}
}
else { // Stretch with lookup table
for(d=0; (d<=dx) && (yd1<dst_surface->h); d++)
{
StretchTemplateLUT(xd1,xd2,xs1,xs2,ys1,yd1, (ST)src_pixels, (DT)dst_pixels, lut);
while(e>=0)
{
src_pixels += src_pitch;
ys1++;
e-=dx2;
}
dst_pixels += dst_pitch;
yd1++;
e+=dy;
}
}
}
void SDL_StretchSurface(SDL_Surface* src_surface, int xs1, int ys1, int xs2, int ys2, SDL_Surface* dst_surface, int xd1, int yd1, int xd2, int yd2, Uint32* lutVOI)
{
int src_bpp = src_surface->format->BytesPerPixel;
int dst_bpp = dst_surface->format->BytesPerPixel;
if(dst_surface->format->BytesPerPixel == 1){
SDL_SetColors(dst_surface, src_surface->format->palette->colors, 0, 256);
}
switch(dst_bpp){
case 1:
switch(src_bpp){
case 1:
RectStretchTemplate(src_surface, (Uint8*)src_surface->pixels, xs1, ys1, xs2, ys2, dst_surface, (Uint8*)dst_surface->pixels, xd1, yd1, xd2, yd2, (Uint32*)NULL);
break;
case 2:
RectStretchTemplate(src_surface, (Uint16*)src_surface->pixels, xs1, ys1, xs2, ys2, dst_surface, (Uint8*)dst_surface->pixels, xd1, yd1, xd2, yd2, lutVOI);
break;
}
break;
case 2:
switch(src_bpp){
case 2:
RectStretchTemplate(src_surface, (Uint16*)src_surface->pixels, xs1, ys1, xs2, ys2, dst_surface, (Uint16*)dst_surface->pixels, xd1, yd1, xd2, yd2, (Uint32*)NULL);
break;
}
break;
case 4:
switch(src_bpp){
case 1:
RectStretchTemplate(src_surface, (Uint8*)src_surface->pixels, xs1, ys1, xs2, ys2, dst_surface, (Uint32*)dst_surface->pixels, xd1, yd1, xd2, yd2, lutVOI);
break;
case 2:
RectStretchTemplate(src_surface, (Uint16*)src_surface->pixels, xs1, ys1, xs2, ys2, dst_surface, (Uint32*)dst_surface->pixels, xd1, yd1, xd2, yd2, lutVOI);
break;
case 4:
RectStretchTemplate(src_surface, (Uint32*)src_surface->pixels, xs1, ys1, xs2, ys2, dst_surface, (Uint32*)dst_surface->pixels, xd1, yd1, xd2, yd2, (Uint32*)NULL);
break;
}
break;
}
}
void SDL_StretchSurface(SDL_Surface* src_surface, SDL_Rect* src_rect, SDL_Surface* dst_surface, SDL_Rect* dst_rect, Uint32* voiLUT){
SDL_StretchSurface(
src_surface,
src_rect->x,
src_rect->y,
src_rect->w,
src_rect->h,
dst_surface,
dst_rect->x,
dst_rect->y,
dst_rect->w,
dst_rect->h,
voiLUT);
}
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