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/*
copys RGB images to a destination
Copyright (C) 2000 Martin Vogt
This program 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.
For more information look at the file COPYRIGHT in this package
*/
#include "ditherRGB.h"
#include <iostream>
using namespace std;
DitherRGB::DitherRGB() {
}
DitherRGB::~DitherRGB() {
}
int DitherRGB::getDepth(int pixel) {
int byteDepth=0;
switch(pixel) {
case 8:
byteDepth=1;
break;
case 15:
case 16:
byteDepth=2;
break;
case 24:
case 32:
byteDepth=4;
break;
default:
cout << "unknown byteDepth:"<<pixel
<< " in DitherRGB_flipped::flipRGBImage"<<endl;
}
return byteDepth;
}
void DitherRGB::ditherRGBImage(unsigned char* dest,unsigned char* src,
int depth,int width,int height,int offset) {
int byteDepth=getDepth(depth);
if (byteDepth == 0) {
return;
}
if (offset==0) {
int bytes=height*width*byteDepth;
memcpy(dest,src,bytes);
return;
}
int i;
int lineSize=width*byteDepth;
offset=offset*byteDepth+lineSize;
for (i=0;i<height;i++) {
memcpy(dest,src,lineSize);
src+=lineSize;
dest+=offset;
}
}
void DitherRGB::ditherRGBImage_x2(unsigned char* dest,unsigned char* src,
int depth,int width,int height,int offset) {
int byteDepth=getDepth(depth);
if (byteDepth == 0) {
return;
}
switch(byteDepth) {
case 1:
ditherRGB1Byte_x2(dest,src,1,width, height,offset);
break;
case 2:
ditherRGB2Byte_x2(dest,src,2,width, height,offset);
break;
case 4:
ditherRGB4Byte_x2(dest,src,4,width, height,offset);
break;
default:
cout <<"ditherRGBImage_x2 byteDepth:"<<byteDepth
<<" not supported"<<endl;
}
}
void DitherRGB::ditherRGB1Byte_x2(unsigned char* dest,unsigned char* src,
int depth,int width,int height,int offset) {
//
// dest destr
// destd destrd
int lineInc=2*width+offset;
unsigned char* destr=dest+1;
unsigned char* destd=dest+lineInc;
unsigned char* destrd=destd+1;
int row;
int col;
//
// We copy byte by byte this is slow, but works for
// all byteDepth
// this memcpy can be optimized with MMX very i) good ii) easily
for(row=0;row<height;row++) {
for(col=0;col<width;col++) {
*dest++=*src;
*destr++=*src;
*destd++=*src;
*destrd++=*src;
dest++;
destr++;
destd++;
destrd++;
src++;
}
dest+=lineInc;
destr+=lineInc;
destd+=lineInc;
destrd+=lineInc;
}
}
void DitherRGB::ditherRGB2Byte_x2(unsigned char* destination,
unsigned char* source,
int depth,int width,int height,int offset) {
//
// dest destr
// destd destrd
unsigned short int* src=(unsigned short int*) source;
unsigned short int* dest=(unsigned short int*) destination;
int lineInc=2*width+offset;
unsigned short int* destr=dest+1;
unsigned short int* destd=dest+lineInc;
unsigned short int* destrd=destd+1;
int row;
int col;
//
// We copy byte by byte this is slow, but works for
// all byteDepth
// this memcpy can be optimized with MMX very i) good ii) easily
for(row=0;row<height;row++) {
for(col=0;col<width;col++) {
*dest++=*src;
*destr++=*src;
*destd++=*src;
*destrd++=*src;
dest++;
destr++;
destd++;
destrd++;
src++;
}
dest+=lineInc;
destr+=lineInc;
destd+=lineInc;
destrd+=lineInc;
}
}
void DitherRGB::ditherRGB4Byte_x2(unsigned char* destination,
unsigned char* source,
int depth,int width,int height,int offset) {
//
// dest destr
// destd destrd
unsigned int* src=(unsigned int*) source;
unsigned int* dest=(unsigned int*) destination;
int lineInc=2*width+offset;
unsigned int* destr=dest+1;
unsigned int* destd=dest+lineInc;
unsigned int* destrd=destd+1;
int row;
int col;
//
// We copy byte by byte this is slow, but works for
// all byteDepth
// this memcpy can be optimized with MMX very i) good ii) easily
for(row=0;row<height;row++) {
for(col=0;col<width;col++) {
*dest++=*src;
*destr++=*src;
*destd++=*src;
*destrd++=*src;
dest++;
destr++;
destd++;
destrd++;
src++;
}
dest+=lineInc;
destr+=lineInc;
destd+=lineInc;
destrd+=lineInc;
}
}
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