// xImaTran.cpp : Transformation functions
/* 07/08/2001 v1.00 - Davide Pizzolato - www.xdp.it
* CxImage version 7.0.0 31/Dec/2010
*/
#include "ximage.h"
#include "ximath.h"
#if CXIMAGE_SUPPORT_BASICTRANSFORMATIONS
////////////////////////////////////////////////////////////////////////////////
/**
* Increases the number of bits per pixel of the image.
* \param nbit: 4, 8, 24
*/
bool CxImage::IncreaseBpp(uint32_t nbit)
{
if (!pDib) return false;
switch (nbit){
case 4:
{
if (head.biBitCount==4) return true;
if (head.biBitCount>4) return false;
CxImage tmp;
tmp.CopyInfo(*this);
tmp.Create(head.biWidth,head.biHeight,4,info.dwType);
tmp.SetPalette(GetPalette(),GetNumColors());
if (!tmp.IsValid()){
strcpy(info.szLastError,tmp.GetLastError());
return false;
}
#if CXIMAGE_SUPPORT_SELECTION
tmp.SelectionCopy(*this);
#endif //CXIMAGE_SUPPORT_SELECTION
#if CXIMAGE_SUPPORT_ALPHA
tmp.AlphaCopy(*this);
#endif //CXIMAGE_SUPPORT_ALPHA
for (int32_t y=0;y<head.biHeight;y++){
if (info.nEscape) break;
for (int32_t x=0;x<head.biWidth;x++){
tmp.BlindSetPixelIndex(x,y,BlindGetPixelIndex(x,y));
}
}
Transfer(tmp);
return true;
}
case 8:
{
if (head.biBitCount==8) return true;
if (head.biBitCount>8) return false;
CxImage tmp;
tmp.CopyInfo(*this);
tmp.Create(head.biWidth,head.biHeight,8,info.dwType);
tmp.SetPalette(GetPalette(),GetNumColors());
if (!tmp.IsValid()){
strcpy(info.szLastError,tmp.GetLastError());
return false;
}
#if CXIMAGE_SUPPORT_SELECTION
tmp.SelectionCopy(*this);
#endif //CXIMAGE_SUPPORT_SELECTION
#if CXIMAGE_SUPPORT_ALPHA
tmp.AlphaCopy(*this);
#endif //CXIMAGE_SUPPORT_ALPHA
for (int32_t y=0;y<head.biHeight;y++){
if (info.nEscape) break;
for (int32_t x=0;x<head.biWidth;x++){
tmp.BlindSetPixelIndex(x,y,BlindGetPixelIndex(x,y));
}
}
Transfer(tmp);
return true;
}
case 24:
{
if (head.biBitCount==24) return true;
if (head.biBitCount>24) return false;
CxImage tmp;
tmp.CopyInfo(*this);
tmp.Create(head.biWidth,head.biHeight,24,info.dwType);
if (!tmp.IsValid()){
strcpy(info.szLastError,tmp.GetLastError());
return false;
}
if (info.nBkgndIndex>=0) //translate transparency
tmp.info.nBkgndColor=GetPaletteColor((uint8_t)info.nBkgndIndex);
#if CXIMAGE_SUPPORT_SELECTION
tmp.SelectionCopy(*this);
#endif //CXIMAGE_SUPPORT_SELECTION
#if CXIMAGE_SUPPORT_ALPHA
tmp.AlphaCopy(*this);
if (AlphaPaletteIsValid() && !AlphaIsValid()) tmp.AlphaCreate();
#endif //CXIMAGE_SUPPORT_ALPHA
for (int32_t y=0;y<head.biHeight;y++){
if (info.nEscape) break;
for (int32_t x=0;x<head.biWidth;x++){
tmp.BlindSetPixelColor(x,y,BlindGetPixelColor(x,y),true);
}
}
Transfer(tmp);
return true;
}
}
return false;
}
////////////////////////////////////////////////////////////////////////////////
bool CxImage::GrayScale()
{
if (!pDib) return false;
if (head.biBitCount<=8){
RGBQUAD* ppal=GetPalette();
int32_t gray;
//converts the colors to gray, use the blue channel only
for(uint32_t i=0;i<head.biClrUsed;i++){
gray=(int32_t)RGB2GRAY(ppal[i].rgbRed,ppal[i].rgbGreen,ppal[i].rgbBlue);
ppal[i].rgbBlue = (uint8_t)gray;
}
// preserve transparency
if (info.nBkgndIndex >= 0) info.nBkgndIndex = ppal[info.nBkgndIndex].rgbBlue;
//create a "real" 8 bit gray scale image
if (head.biBitCount==8){
uint8_t *img=info.pImage;
for(uint32_t i=0;i<head.biSizeImage;i++) img[i]=ppal[img[i]].rgbBlue;
SetGrayPalette();
}
//transform to 8 bit gray scale
if (head.biBitCount==4 || head.biBitCount==1){
CxImage ima;
ima.CopyInfo(*this);
if (!ima.Create(head.biWidth,head.biHeight,8,info.dwType)) return false;
ima.SetGrayPalette();
#if CXIMAGE_SUPPORT_SELECTION
ima.SelectionCopy(*this);
#endif //CXIMAGE_SUPPORT_SELECTION
#if CXIMAGE_SUPPORT_ALPHA
ima.AlphaCopy(*this);
#endif //CXIMAGE_SUPPORT_ALPHA
for (int32_t y=0;y<head.biHeight;y++){
uint8_t *iDst = ima.GetBits(y);
uint8_t *iSrc = GetBits(y);
for (int32_t x=0;x<head.biWidth; x++){
//iDst[x]=ppal[BlindGetPixelIndex(x,y)].rgbBlue;
if (head.biBitCount==4){
uint8_t pos = (uint8_t)(4*(1-x%2));
iDst[x]= ppal[(uint8_t)((iSrc[x >> 1]&((uint8_t)0x0F<<pos)) >> pos)].rgbBlue;
} else {
uint8_t pos = (uint8_t)(7-x%8);
iDst[x]= ppal[(uint8_t)((iSrc[x >> 3]&((uint8_t)0x01<<pos)) >> pos)].rgbBlue;
}
}
}
Transfer(ima);
}
} else { //from RGB to 8 bit gray scale
uint8_t *iSrc=info.pImage;
CxImage ima;
ima.CopyInfo(*this);
if (!ima.Create(head.biWidth,head.biHeight,8,info.dwType)) return false;
ima.SetGrayPalette();
if (GetTransIndex()>=0){
RGBQUAD c = GetTransColor();
ima.SetTransIndex((uint8_t)RGB2GRAY(c.rgbRed,c.rgbGreen,c.rgbBlue));
}
#if CXIMAGE_SUPPORT_SELECTION
ima.SelectionCopy(*this);
#endif //CXIMAGE_SUPPORT_SELECTION
#if CXIMAGE_SUPPORT_ALPHA
ima.AlphaCopy(*this);
#endif //CXIMAGE_SUPPORT_ALPHA
uint8_t *img=ima.GetBits();
int32_t l8=ima.GetEffWidth();
int32_t l=head.biWidth * 3;
for(int32_t y=0; y < head.biHeight; y++) {
for(int32_t x=0,x8=0; x < l; x+=3,x8++) {
img[x8+y*l8]=(uint8_t)RGB2GRAY(*(iSrc+x+2),*(iSrc+x+1),*(iSrc+x+0));
}
iSrc+=info.dwEffWidth;
}
Transfer(ima);
}
return true;
}
////////////////////////////////////////////////////////////////////////////////
/**
* \sa Mirror
* \author [qhbo]
*/
bool CxImage::Flip(bool bFlipSelection, bool bFlipAlpha)
{
if (!pDib) return false;
uint8_t *buff = (uint8_t*)malloc(info.dwEffWidth);
if (!buff) return false;
uint8_t *iSrc,*iDst;
iSrc = GetBits(head.biHeight-1);
iDst = GetBits(0);
for (int32_t i=0; i<(head.biHeight/2); ++i)
{
memcpy(buff, iSrc, info.dwEffWidth);
memcpy(iSrc, iDst, info.dwEffWidth);
memcpy(iDst, buff, info.dwEffWidth);
iSrc-=info.dwEffWidth;
iDst+=info.dwEffWidth;
}
free(buff);
if (bFlipSelection){
#if CXIMAGE_SUPPORT_SELECTION
SelectionFlip();
#endif //CXIMAGE_SUPPORT_SELECTION
}
if (bFlipAlpha){
#if CXIMAGE_SUPPORT_ALPHA
AlphaFlip();
#endif //CXIMAGE_SUPPORT_ALPHA
}
return true;
}
////////////////////////////////////////////////////////////////////////////////
/**
* \sa Flip
*/
bool CxImage::Mirror(bool bMirrorSelection, bool bMirrorAlpha)
{
if (!pDib) return false;
CxImage* imatmp = new CxImage(*this,false,true,true);
if (!imatmp) return false;
if (!imatmp->IsValid()){
delete imatmp;
return false;
}
uint8_t *iSrc,*iDst;
int32_t wdt=(head.biWidth-1) * (head.biBitCount==24 ? 3:1);
iSrc=info.pImage + wdt;
iDst=imatmp->info.pImage;
int32_t x,y;
switch (head.biBitCount){
case 24:
for(y=0; y < head.biHeight; y++){
for(x=0; x <= wdt; x+=3){
*(iDst+x)=*(iSrc-x);
*(iDst+x+1)=*(iSrc-x+1);
*(iDst+x+2)=*(iSrc-x+2);
}
iSrc+=info.dwEffWidth;
iDst+=info.dwEffWidth;
}
break;
case 8:
for(y=0; y < head.biHeight; y++){
for(x=0; x <= wdt; x++)
*(iDst+x)=*(iSrc-x);
iSrc+=info.dwEffWidth;
iDst+=info.dwEffWidth;
}
break;
default:
for(y=0; y < head.biHeight; y++){
for(x=0; x <= wdt; x++)
imatmp->SetPixelIndex(x,y,GetPixelIndex(wdt-x,y));
}
}
if (bMirrorSelection){
#if CXIMAGE_SUPPORT_SELECTION
imatmp->SelectionMirror();
#endif //CXIMAGE_SUPPORT_SELECTION
}
if (bMirrorAlpha){
#if CXIMAGE_SUPPORT_ALPHA
imatmp->AlphaMirror();
#endif //CXIMAGE_SUPPORT_ALPHA
}
Transfer(*imatmp);
delete imatmp;
return true;
}
////////////////////////////////////////////////////////////////////////////////
#define RBLOCK 64
////////////////////////////////////////////////////////////////////////////////
bool CxImage::RotateLeft(CxImage* iDst)
{
if (!pDib) return false;
int32_t newWidth = GetHeight();
int32_t newHeight = GetWidth();
CxImage imgDest;
imgDest.CopyInfo(*this);
imgDest.Create(newWidth,newHeight,GetBpp(),GetType());
imgDest.SetPalette(GetPalette());
#if CXIMAGE_SUPPORT_ALPHA
if (AlphaIsValid()) imgDest.AlphaCreate();
#endif
#if CXIMAGE_SUPPORT_SELECTION
if (SelectionIsValid()) imgDest.SelectionCreate();
#endif
int32_t x,x2,y,dlineup;
// Speedy rotate for BW images <Robert Abram>
if (head.biBitCount == 1) {
uint8_t *sbits, *dbits, *dbitsmax, bitpos, *nrow,*srcdisp;
ldiv_t div_r;
uint8_t *bsrc = GetBits(), *bdest = imgDest.GetBits();
dbitsmax = bdest + imgDest.head.biSizeImage - 1;
dlineup = 8 * imgDest.info.dwEffWidth - imgDest.head.biWidth;
imgDest.Clear(0);
for (y = 0; y < head.biHeight; y++) {
// Figure out the Column we are going to be copying to
div_r = ldiv(y + dlineup, (int32_t)8);
// set bit pos of src column byte
bitpos = (uint8_t)(1 << div_r.rem);
srcdisp = bsrc + y * info.dwEffWidth;
for (x = 0; x < (int32_t)info.dwEffWidth; x++) {
// Get Source Bits
sbits = srcdisp + x;
// Get destination column
nrow = bdest + (x * 8) * imgDest.info.dwEffWidth + imgDest.info.dwEffWidth - 1 - div_r.quot;
for (int32_t z = 0; z < 8; z++) {
// Get Destination Byte
dbits = nrow + z * imgDest.info.dwEffWidth;
if ((dbits < bdest) || (dbits > dbitsmax)) break;
if (*sbits & (128 >> z)) *dbits |= bitpos;
}
}
}//for y
#if CXIMAGE_SUPPORT_ALPHA
if (AlphaIsValid()) {
for (x = 0; x < newWidth; x++){
x2=newWidth-x-1;
for (y = 0; y < newHeight; y++){
imgDest.AlphaSet(x,y,BlindAlphaGet(y, x2));
}//for y
}//for x
}
#endif //CXIMAGE_SUPPORT_ALPHA
#if CXIMAGE_SUPPORT_SELECTION
if (SelectionIsValid()) {
imgDest.info.rSelectionBox.left = newWidth-info.rSelectionBox.top;
imgDest.info.rSelectionBox.right = newWidth-info.rSelectionBox.bottom;
imgDest.info.rSelectionBox.bottom = info.rSelectionBox.left;
imgDest.info.rSelectionBox.top = info.rSelectionBox.right;
for (x = 0; x < newWidth; x++){
x2=newWidth-x-1;
for (y = 0; y < newHeight; y++){
imgDest.SelectionSet(x,y,BlindSelectionGet(y, x2));
}//for y
}//for x
}
#endif //CXIMAGE_SUPPORT_SELECTION
} else {
//anything other than BW:
//bd, 10. 2004: This optimized version of rotation rotates image by smaller blocks. It is quite
//a bit faster than obvious algorithm, because it produces much less CPU cache misses.
//This optimization can be tuned by changing block size (RBLOCK). 96 is good value for current
//CPUs (tested on Athlon XP and Celeron D). Larger value (if CPU has enough cache) will increase
//speed somehow, but once you drop out of CPU's cache, things will slow down drastically.
//For older CPUs with less cache, lower value would yield better results.
uint8_t *srcPtr, *dstPtr; //source and destionation for 24-bit version
int32_t xs, ys; //x-segment and y-segment
for (xs = 0; xs < newWidth; xs+=RBLOCK) { //for all image blocks of RBLOCK*RBLOCK pixels
for (ys = 0; ys < newHeight; ys+=RBLOCK) {
if (head.biBitCount==24) {
//RGB24 optimized pixel access:
for (x = xs; x < min(newWidth, xs+RBLOCK); x++){ //do rotation
info.nProgress = (int32_t)(100*x/newWidth);
x2=newWidth-x-1;
dstPtr = (uint8_t*) imgDest.BlindGetPixelPointer(x,ys);
srcPtr = (uint8_t*) BlindGetPixelPointer(ys, x2);
for (y = ys; y < min(newHeight, ys+RBLOCK); y++){
//imgDest.SetPixelColor(x, y, GetPixelColor(y, x2));
*(dstPtr) = *(srcPtr);
*(dstPtr+1) = *(srcPtr+1);
*(dstPtr+2) = *(srcPtr+2);
srcPtr += 3;
dstPtr += imgDest.info.dwEffWidth;
}//for y
}//for x
} else {
//anything else than 24bpp (and 1bpp): palette
for (x = xs; x < min(newWidth, xs+RBLOCK); x++){
info.nProgress = (int32_t)(100*x/newWidth); //<Anatoly Ivasyuk>
x2=newWidth-x-1;
for (y = ys; y < min(newHeight, ys+RBLOCK); y++){
imgDest.SetPixelIndex(x, y, BlindGetPixelIndex(y, x2));
}//for y
}//for x
}//if (version selection)
#if CXIMAGE_SUPPORT_ALPHA
if (AlphaIsValid()) {
for (x = xs; x < min(newWidth, xs+RBLOCK); x++){
x2=newWidth-x-1;
for (y = ys; y < min(newHeight, ys+RBLOCK); y++){
imgDest.AlphaSet(x,y,BlindAlphaGet(y, x2));
}//for y
}//for x
}//if (alpha channel)
#endif //CXIMAGE_SUPPORT_ALPHA
#if CXIMAGE_SUPPORT_SELECTION
if (SelectionIsValid()) {
imgDest.info.rSelectionBox.left = newWidth-info.rSelectionBox.top;
imgDest.info.rSelectionBox.right = newWidth-info.rSelectionBox.bottom;
imgDest.info.rSelectionBox.bottom = info.rSelectionBox.left;
imgDest.info.rSelectionBox.top = info.rSelectionBox.right;
for (x = xs; x < min(newWidth, xs+RBLOCK); x++){
x2=newWidth-x-1;
for (y = ys; y < min(newHeight, ys+RBLOCK); y++){
imgDest.SelectionSet(x,y,BlindSelectionGet(y, x2));
}//for y
}//for x
}//if (selection)
#endif //CXIMAGE_SUPPORT_SELECTION
}//for ys
}//for xs
}//if
//select the destination
if (iDst) iDst->Transfer(imgDest);
else Transfer(imgDest);
return true;
}
////////////////////////////////////////////////////////////////////////////////
bool CxImage::RotateRight(CxImage* iDst)
{
if (!pDib) return false;
int32_t newWidth = GetHeight();
int32_t newHeight = GetWidth();
CxImage imgDest;
imgDest.CopyInfo(*this);
imgDest.Create(newWidth,newHeight,GetBpp(),GetType());
imgDest.SetPalette(GetPalette());
#if CXIMAGE_SUPPORT_ALPHA
if (AlphaIsValid()) imgDest.AlphaCreate();
#endif
#if CXIMAGE_SUPPORT_SELECTION
if (SelectionIsValid()) imgDest.SelectionCreate();
#endif
int32_t x,y,y2;
// Speedy rotate for BW images <Robert Abram>
if (head.biBitCount == 1) {
uint8_t *sbits, *dbits, *dbitsmax, bitpos, *nrow,*srcdisp;
ldiv_t div_r;
uint8_t *bsrc = GetBits(), *bdest = imgDest.GetBits();
dbitsmax = bdest + imgDest.head.biSizeImage - 1;
imgDest.Clear(0);
for (y = 0; y < head.biHeight; y++) {
// Figure out the Column we are going to be copying to
div_r = ldiv(y, (int32_t)8);
// set bit pos of src column byte
bitpos = (uint8_t)(128 >> div_r.rem);
srcdisp = bsrc + y * info.dwEffWidth;
for (x = 0; x < (int32_t)info.dwEffWidth; x++) {
// Get Source Bits
sbits = srcdisp + x;
// Get destination column
nrow = bdest + (imgDest.head.biHeight-1-(x*8)) * imgDest.info.dwEffWidth + div_r.quot;
for (int32_t z = 0; z < 8; z++) {
// Get Destination Byte
dbits = nrow - z * imgDest.info.dwEffWidth;
if ((dbits < bdest) || (dbits > dbitsmax)) break;
if (*sbits & (128 >> z)) *dbits |= bitpos;
}
}
}
#if CXIMAGE_SUPPORT_ALPHA
if (AlphaIsValid()){
for (y = 0; y < newHeight; y++){
y2=newHeight-y-1;
for (x = 0; x < newWidth; x++){
imgDest.AlphaSet(x,y,BlindAlphaGet(y2, x));
}
}
}
#endif //CXIMAGE_SUPPORT_ALPHA
#if CXIMAGE_SUPPORT_SELECTION
if (SelectionIsValid()){
imgDest.info.rSelectionBox.left = info.rSelectionBox.bottom;
imgDest.info.rSelectionBox.right = info.rSelectionBox.top;
imgDest.info.rSelectionBox.bottom = newHeight-info.rSelectionBox.right;
imgDest.info.rSelectionBox.top = newHeight-info.rSelectionBox.left;
for (y = 0; y < newHeight; y++){
y2=newHeight-y-1;
for (x = 0; x < newWidth; x++){
imgDest.SelectionSet(x,y,BlindSelectionGet(y2, x));
}
}
}
#endif //CXIMAGE_SUPPORT_SELECTION
} else {
//anything else but BW
uint8_t *srcPtr, *dstPtr; //source and destionation for 24-bit version
int32_t xs, ys; //x-segment and y-segment
for (xs = 0; xs < newWidth; xs+=RBLOCK) {
for (ys = 0; ys < newHeight; ys+=RBLOCK) {
if (head.biBitCount==24) {
//RGB24 optimized pixel access:
for (y = ys; y < min(newHeight, ys+RBLOCK); y++){
info.nProgress = (int32_t)(100*y/newHeight); //<Anatoly Ivasyuk>
y2=newHeight-y-1;
dstPtr = (uint8_t*) imgDest.BlindGetPixelPointer(xs,y);
srcPtr = (uint8_t*) BlindGetPixelPointer(y2, xs);
for (x = xs; x < min(newWidth, xs+RBLOCK); x++){
//imgDest.SetPixelColor(x, y, GetPixelColor(y2, x));
*(dstPtr) = *(srcPtr);
*(dstPtr+1) = *(srcPtr+1);
*(dstPtr+2) = *(srcPtr+2);
dstPtr += 3;
srcPtr += info.dwEffWidth;
}//for x
}//for y
} else {
//anything else than BW & RGB24: palette
for (y = ys; y < min(newHeight, ys+RBLOCK); y++){
info.nProgress = (int32_t)(100*y/newHeight); //<Anatoly Ivasyuk>
y2=newHeight-y-1;
for (x = xs; x < min(newWidth, xs+RBLOCK); x++){
imgDest.SetPixelIndex(x, y, BlindGetPixelIndex(y2, x));
}//for x
}//for y
}//if
#if CXIMAGE_SUPPORT_ALPHA
if (AlphaIsValid()){
for (y = ys; y < min(newHeight, ys+RBLOCK); y++){
y2=newHeight-y-1;
for (x = xs; x < min(newWidth, xs+RBLOCK); x++){
imgDest.AlphaSet(x,y,BlindAlphaGet(y2, x));
}//for x
}//for y
}//if (has alpha)
#endif //CXIMAGE_SUPPORT_ALPHA
#if CXIMAGE_SUPPORT_SELECTION
if (SelectionIsValid()){
imgDest.info.rSelectionBox.left = info.rSelectionBox.bottom;
imgDest.info.rSelectionBox.right = info.rSelectionBox.top;
imgDest.info.rSelectionBox.bottom = newHeight-info.rSelectionBox.right;
imgDest.info.rSelectionBox.top = newHeight-info.rSelectionBox.left;
for (y = ys; y < min(newHeight, ys+RBLOCK); y++){
y2=newHeight-y-1;
for (x = xs; x < min(newWidth, xs+RBLOCK); x++){
imgDest.SelectionSet(x,y,BlindSelectionGet(y2, x));
}//for x
}//for y
}//if (has alpha)
#endif //CXIMAGE_SUPPORT_SELECTION
}//for ys
}//for xs
}//if
//select the destination
if (iDst) iDst->Transfer(imgDest);
else Transfer(imgDest);
return true;
}
////////////////////////////////////////////////////////////////////////////////
bool CxImage::Negative()
{
if (!pDib) return false;
if (head.biBitCount<=8){
if (IsGrayScale()){ //GRAYSCALE, selection
if (pSelection){
for(int32_t y=info.rSelectionBox.bottom; y<info.rSelectionBox.top; y++){
for(int32_t x=info.rSelectionBox.left; x<info.rSelectionBox.right; x++){
#if CXIMAGE_SUPPORT_SELECTION
if (BlindSelectionIsInside(x,y))
#endif //CXIMAGE_SUPPORT_SELECTION
{
BlindSetPixelIndex(x,y,(uint8_t)(255-BlindGetPixelIndex(x,y)));
}
}
}
} else {
uint8_t *iSrc=info.pImage;
for(uint32_t i=0; i < head.biSizeImage; i++){
*iSrc=(uint8_t)~(*(iSrc));
iSrc++;
}
}
} else { //PALETTE, full image
RGBQUAD* ppal=GetPalette();
for(uint32_t i=0;i<head.biClrUsed;i++){
ppal[i].rgbBlue =(uint8_t)(255-ppal[i].rgbBlue);
ppal[i].rgbGreen =(uint8_t)(255-ppal[i].rgbGreen);
ppal[i].rgbRed =(uint8_t)(255-ppal[i].rgbRed);
}
}
} else {
if (pSelection==NULL){ //RGB, full image
uint8_t *iSrc=info.pImage;
for(uint32_t i=0; i < head.biSizeImage; i++){
*iSrc=(uint8_t)~(*(iSrc));
iSrc++;
}
} else { // RGB with selection
RGBQUAD color;
for(int32_t y=info.rSelectionBox.bottom; y<info.rSelectionBox.top; y++){
for(int32_t x=info.rSelectionBox.left; x<info.rSelectionBox.right; x++){
#if CXIMAGE_SUPPORT_SELECTION
if (BlindSelectionIsInside(x,y))
#endif //CXIMAGE_SUPPORT_SELECTION
{
color = BlindGetPixelColor(x,y);
color.rgbRed = (uint8_t)(255-color.rgbRed);
color.rgbGreen = (uint8_t)(255-color.rgbGreen);
color.rgbBlue = (uint8_t)(255-color.rgbBlue);
BlindSetPixelColor(x,y,color);
}
}
}
}
//<DP> invert transparent color too
info.nBkgndColor.rgbBlue = (uint8_t)(255-info.nBkgndColor.rgbBlue);
info.nBkgndColor.rgbGreen = (uint8_t)(255-info.nBkgndColor.rgbGreen);
info.nBkgndColor.rgbRed = (uint8_t)(255-info.nBkgndColor.rgbRed);
}
return true;
}
////////////////////////////////////////////////////////////////////////////////
#endif //CXIMAGE_SUPPORT_BASICTRANSFORMATIONS
////////////////////////////////////////////////////////////////////////////////
#if CXIMAGE_SUPPORT_TRANSFORMATION
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
#if CXIMAGE_SUPPORT_EXIF
bool CxImage::RotateExif(int32_t orientation /* = 0 */)
{
bool ret = true;
if (orientation <= 0)
orientation = info.ExifInfo.Orientation;
if (orientation == 3)
ret = Rotate180();
else if (orientation == 6)
ret = RotateRight();
else if (orientation == 8)
ret = RotateLeft();
else if (orientation == 5)
ret = RotateLeft();
info.ExifInfo.Orientation = 1;
return ret;
}
#endif //CXIMAGE_SUPPORT_EXIF
////////////////////////////////////////////////////////////////////////////////
bool CxImage::Rotate(float angle, CxImage* iDst)
{
if (!pDib) return false;
if (fmod(angle,180.0f)==0.0f && fmod(angle,360.0f)!=0.0f)
return Rotate180(iDst);
// Copyright (c) 1996-1998 Ulrich von Zadow
// Negative the angle, because the y-axis is negative.
double ang = -angle*acos((float)0)/90;
int32_t newWidth, newHeight;
int32_t nWidth = GetWidth();
int32_t nHeight= GetHeight();
double cos_angle = cos(ang);
double sin_angle = sin(ang);
// Calculate the size of the new bitmap
POINT p1={0,0};
POINT p2={nWidth,0};
POINT p3={0,nHeight};
POINT p4={nWidth,nHeight};
CxPoint2 newP1,newP2,newP3,newP4, leftTop, rightTop, leftBottom, rightBottom;
newP1.x = (float)p1.x;
newP1.y = (float)p1.y;
newP2.x = (float)(p2.x*cos_angle - p2.y*sin_angle);
newP2.y = (float)(p2.x*sin_angle + p2.y*cos_angle);
newP3.x = (float)(p3.x*cos_angle - p3.y*sin_angle);
newP3.y = (float)(p3.x*sin_angle + p3.y*cos_angle);
newP4.x = (float)(p4.x*cos_angle - p4.y*sin_angle);
newP4.y = (float)(p4.x*sin_angle + p4.y*cos_angle);
leftTop.x = min(min(newP1.x,newP2.x),min(newP3.x,newP4.x));
leftTop.y = min(min(newP1.y,newP2.y),min(newP3.y,newP4.y));
rightBottom.x = max(max(newP1.x,newP2.x),max(newP3.x,newP4.x));
rightBottom.y = max(max(newP1.y,newP2.y),max(newP3.y,newP4.y));
leftBottom.x = leftTop.x;
leftBottom.y = rightBottom.y;
rightTop.x = rightBottom.x;
rightTop.y = leftTop.y;
newWidth = (int32_t) floor(0.5f + rightTop.x - leftTop.x);
newHeight= (int32_t) floor(0.5f + leftBottom.y - leftTop.y);
CxImage imgDest;
imgDest.CopyInfo(*this);
imgDest.Create(newWidth,newHeight,GetBpp(),GetType());
imgDest.SetPalette(GetPalette());
#if CXIMAGE_SUPPORT_ALPHA
if(AlphaIsValid()) //MTA: Fix for rotation problem when the image has an alpha channel
{
imgDest.AlphaCreate();
imgDest.AlphaClear();
}
#endif //CXIMAGE_SUPPORT_ALPHA
int32_t x,y,newX,newY,oldX,oldY;
if (head.biClrUsed==0){ //RGB
for (y = (int32_t)leftTop.y, newY = 0; y<=(int32_t)leftBottom.y; y++,newY++){
info.nProgress = (int32_t)(100*newY/newHeight);
if (info.nEscape) break;
for (x = (int32_t)leftTop.x, newX = 0; x<=(int32_t)rightTop.x; x++,newX++){
oldX = (int32_t)(x*cos_angle + y*sin_angle + 0.5);
oldY = (int32_t)(y*cos_angle - x*sin_angle + 0.5);
imgDest.SetPixelColor(newX,newY,GetPixelColor(oldX,oldY));
#if CXIMAGE_SUPPORT_ALPHA
imgDest.AlphaSet(newX,newY,AlphaGet(oldX,oldY)); //MTA: copy the alpha value
#endif //CXIMAGE_SUPPORT_ALPHA
}
}
} else { //PALETTE
for (y = (int32_t)leftTop.y, newY = 0; y<=(int32_t)leftBottom.y; y++,newY++){
info.nProgress = (int32_t)(100*newY/newHeight);
if (info.nEscape) break;
for (x = (int32_t)leftTop.x, newX = 0; x<=(int32_t)rightTop.x; x++,newX++){
oldX = (int32_t)(x*cos_angle + y*sin_angle + 0.5);
oldY = (int32_t)(y*cos_angle - x*sin_angle + 0.5);
imgDest.SetPixelIndex(newX,newY,GetPixelIndex(oldX,oldY));
#if CXIMAGE_SUPPORT_ALPHA
imgDest.AlphaSet(newX,newY,AlphaGet(oldX,oldY)); //MTA: copy the alpha value
#endif //CXIMAGE_SUPPORT_ALPHA
}
}
}
//select the destination
if (iDst) iDst->Transfer(imgDest);
else Transfer(imgDest);
return true;
}
////////////////////////////////////////////////////////////////////////////////
/**
* Rotates image around it's center.
* Method can use interpolation with paletted images, but does not change pallete, so results vary.
* (If you have only four colours in a palette, there's not much room for interpolation.)
*
* \param angle - angle in degrees (positive values rotate clockwise)
* \param *iDst - destination image (if null, this image is changed)
* \param inMethod - interpolation method used
* (IM_NEAREST_NEIGHBOUR produces aliasing (fast), IM_BILINEAR softens picture a bit (slower)
* IM_SHARPBICUBIC is slower and produces some halos...)
* \param ofMethod - overflow method (how to choose colour of pixels that have no source)
* \param replColor - replacement colour to use (OM_COLOR, OM_BACKGROUND with no background colour...)
* \param optimizeRightAngles - call faster methods for 90, 180, and 270 degree rotations. Faster methods
* are called for angles, where error (in location of corner pixels) is less
* than 0.25 pixels.
* \param bKeepOriginalSize - rotates the image without resizing.
*
* \author ***bd*** 2.2004
*/
bool CxImage::Rotate2(float angle,
CxImage *iDst,
InterpolationMethod inMethod,
OverflowMethod ofMethod,
RGBQUAD *replColor,
bool const optimizeRightAngles,
bool const bKeepOriginalSize)
{
if (!pDib) return false; //no dib no go
if (fmod(angle,180.0f)==0.0f && fmod(angle,360.0f)!=0.0f)
return Rotate180(iDst);
double ang = -angle*acos(0.0f)/90.0f; //convert angle to radians and invert (positive angle performs clockwise rotation)
float cos_angle = (float) cos(ang); //these two are needed later (to rotate)
float sin_angle = (float) sin(ang);
//Calculate the size of the new bitmap (rotate corners of image)
CxPoint2 p[4]; //original corners of the image
p[0]=CxPoint2(-0.5f,-0.5f);
p[1]=CxPoint2(GetWidth()-0.5f,-0.5f);
p[2]=CxPoint2(-0.5f,GetHeight()-0.5f);
p[3]=CxPoint2(GetWidth()-0.5f,GetHeight()-0.5f);
CxPoint2 newp[4]; //rotated positions of corners
//(rotate corners)
if (bKeepOriginalSize){
for (int32_t i=0; i<4; i++) {
newp[i].x = p[i].x;
newp[i].y = p[i].y;
}//for
} else {
for (int32_t i=0; i<4; i++) {
newp[i].x = (p[i].x*cos_angle - p[i].y*sin_angle);
newp[i].y = (p[i].x*sin_angle + p[i].y*cos_angle);
}//for i
if (optimizeRightAngles) {
//For rotations of 90, -90 or 180 or 0 degrees, call faster routines
if (newp[3].Distance(CxPoint2(GetHeight()-0.5f, 0.5f-GetWidth())) < 0.25)
//rotation right for circa 90 degrees (diagonal pixels less than 0.25 pixel away from 90 degree rotation destination)
return RotateRight(iDst);
if (newp[3].Distance(CxPoint2(0.5f-GetHeight(), -0.5f+GetWidth())) < 0.25)
//rotation left for ~90 degrees
return RotateLeft(iDst);
if (newp[3].Distance(CxPoint2(0.5f-GetWidth(), 0.5f-GetHeight())) < 0.25)
//rotation left for ~180 degrees
return Rotate180(iDst);
if (newp[3].Distance(p[3]) < 0.25) {
//rotation not significant
if (iDst) iDst->Copy(*this); //copy image to iDst, if required
return true; //and we're done
}//if
}//if
}//if
//(read new dimensions from location of corners)
float minx = (float) min(min(newp[0].x,newp[1].x),min(newp[2].x,newp[3].x));
float miny = (float) min(min(newp[0].y,newp[1].y),min(newp[2].y,newp[3].y));
float maxx = (float) max(max(newp[0].x,newp[1].x),max(newp[2].x,newp[3].x));
float maxy = (float) max(max(newp[0].y,newp[1].y),max(newp[2].y,newp[3].y));
int32_t newWidth = (int32_t) floor(maxx-minx+0.5f);
int32_t newHeight= (int32_t) floor(maxy-miny+0.5f);
float ssx=((maxx+minx)- ((float) newWidth-1))/2.0f; //start for x
float ssy=((maxy+miny)- ((float) newHeight-1))/2.0f; //start for y
float newxcenteroffset = 0.5f * newWidth;
float newycenteroffset = 0.5f * newHeight;
if (bKeepOriginalSize){
ssx -= 0.5f * GetWidth();
ssy -= 0.5f * GetHeight();
}
//create destination image
CxImage imgDest;
imgDest.CopyInfo(*this);
imgDest.Create(newWidth,newHeight,GetBpp(),GetType());
imgDest.SetPalette(GetPalette());
#if CXIMAGE_SUPPORT_ALPHA
if(AlphaIsValid()) imgDest.AlphaCreate(); //MTA: Fix for rotation problem when the image has an alpha channel
#endif //CXIMAGE_SUPPORT_ALPHA
RGBQUAD rgb; //pixel colour
RGBQUAD rc;
if (replColor!=0)
rc=*replColor;
else {
rc.rgbRed=255; rc.rgbGreen=255; rc.rgbBlue=255; rc.rgbReserved=0;
}//if
float x,y; //destination location (float, with proper offset)
float origx, origy; //origin location
int32_t destx, desty; //destination location
y=ssy; //initialize y
if (!IsIndexed()){ //RGB24
//optimized RGB24 implementation (direct write to destination):
uint8_t *pxptr;
#if CXIMAGE_SUPPORT_ALPHA
uint8_t *pxptra=0;
#endif //CXIMAGE_SUPPORT_ALPHA
for (desty=0; desty<newHeight; desty++) {
info.nProgress = (int32_t)(100*desty/newHeight);
if (info.nEscape) break;
//initialize x
x=ssx;
//calculate pointer to first byte in row
pxptr=(uint8_t *)imgDest.BlindGetPixelPointer(0, desty);
#if CXIMAGE_SUPPORT_ALPHA
//calculate pointer to first byte in row
if (AlphaIsValid()) pxptra=imgDest.AlphaGetPointer(0, desty);
#endif //CXIMAGE_SUPPORT_ALPHA
for (destx=0; destx<newWidth; destx++) {
//get source pixel coordinate for current destination point
//origx = (cos_angle*(x-head.biWidth/2)+sin_angle*(y-head.biHeight/2))+newWidth/2;
//origy = (cos_angle*(y-head.biHeight/2)-sin_angle*(x-head.biWidth/2))+newHeight/2;
origx = cos_angle*x+sin_angle*y;
origy = cos_angle*y-sin_angle*x;
if (bKeepOriginalSize){
origx += newxcenteroffset;
origy += newycenteroffset;
}
rgb = GetPixelColorInterpolated(origx, origy, inMethod, ofMethod, &rc); //get interpolated colour value
//copy alpha and colour value to destination
#if CXIMAGE_SUPPORT_ALPHA
if (pxptra) *pxptra++ = rgb.rgbReserved;
#endif //CXIMAGE_SUPPORT_ALPHA
*pxptr++ = rgb.rgbBlue;
*pxptr++ = rgb.rgbGreen;
*pxptr++ = rgb.rgbRed;
x++;
}//for destx
y++;
}//for desty
} else {
//non-optimized implementation for paletted images
for (desty=0; desty<newHeight; desty++) {
info.nProgress = (int32_t)(100*desty/newHeight);
if (info.nEscape) break;
x=ssx;
for (destx=0; destx<newWidth; destx++) {
//get source pixel coordinate for current destination point
origx=(cos_angle*x+sin_angle*y);
origy=(cos_angle*y-sin_angle*x);
if (bKeepOriginalSize){
origx += newxcenteroffset;
origy += newycenteroffset;
}
rgb = GetPixelColorInterpolated(origx, origy, inMethod, ofMethod, &rc);
//***!*** SetPixelColor is slow for palleted images
#if CXIMAGE_SUPPORT_ALPHA
if (AlphaIsValid())
imgDest.SetPixelColor(destx,desty,rgb,true);
else
#endif //CXIMAGE_SUPPORT_ALPHA
imgDest.SetPixelColor(destx,desty,rgb,false);
x++;
}//for destx
y++;
}//for desty
}
//select the destination
if (iDst) iDst->Transfer(imgDest);
else Transfer(imgDest);
return true;
}
////////////////////////////////////////////////////////////////////////////////
bool CxImage::Rotate180(CxImage* iDst)
{
if (!pDib) return false;
int32_t wid = GetWidth();
int32_t ht = GetHeight();
CxImage imgDest;
imgDest.CopyInfo(*this);
imgDest.Create(wid,ht,GetBpp(),GetType());
imgDest.SetPalette(GetPalette());
#if CXIMAGE_SUPPORT_ALPHA
if (AlphaIsValid()) imgDest.AlphaCreate();
#endif //CXIMAGE_SUPPORT_ALPHA
int32_t x,y,y2;
for (y = 0; y < ht; y++){
info.nProgress = (int32_t)(100*y/ht); //<Anatoly Ivasyuk>
y2=ht-y-1;
for (x = 0; x < wid; x++){
if(head.biClrUsed==0)//RGB
imgDest.SetPixelColor(wid-x-1, y2, BlindGetPixelColor(x, y));
else //PALETTE
imgDest.SetPixelIndex(wid-x-1, y2, BlindGetPixelIndex(x, y));
#if CXIMAGE_SUPPORT_ALPHA
if (AlphaIsValid()) imgDest.AlphaSet(wid-x-1, y2,BlindAlphaGet(x, y));
#endif //CXIMAGE_SUPPORT_ALPHA
}
}
//select the destination
if (iDst) iDst->Transfer(imgDest);
else Transfer(imgDest);
return true;
}
////////////////////////////////////////////////////////////////////////////////
/**
* Resizes the image. mode can be 0 for slow (bilinear) method ,
* 1 for fast (nearest pixel) method, or 2 for accurate (bicubic spline interpolation) method.
* The function is faster with 24 and 1 bpp images, slow for 4 bpp images and slowest for 8 bpp images.
*/
bool CxImage::Resample(int32_t newx, int32_t newy, int32_t mode, CxImage* iDst)
{
if (newx==0 || newy==0) return false;
if (head.biWidth==newx && head.biHeight==newy){
if (iDst) iDst->Copy(*this);
return true;
}
float xScale, yScale, fX, fY;
xScale = (float)head.biWidth / (float)newx;
yScale = (float)head.biHeight / (float)newy;
CxImage newImage;
newImage.CopyInfo(*this);
newImage.Create(newx,newy,head.biBitCount,GetType());
newImage.SetPalette(GetPalette());
if (!newImage.IsValid()){
strcpy(info.szLastError,newImage.GetLastError());
return false;
}
switch (mode) {
case 1: // nearest pixel
{
for(int32_t y=0; y<newy; y++){
info.nProgress = (int32_t)(100*y/newy);
if (info.nEscape) break;
fY = y * yScale;
for(int32_t x=0; x<newx; x++){
fX = x * xScale;
newImage.SetPixelColor(x,y,GetPixelColor((int32_t)fX,(int32_t)fY));
}
}
break;
}
case 2: // bicubic interpolation by Blake L. Carlson <blake-carlson(at)uiowa(dot)edu
{
float f_x, f_y, a, b, rr, gg, bb, r1, r2;
int32_t i_x, i_y, xx, yy;
RGBQUAD rgb;
uint8_t* iDst;
for(int32_t y=0; y<newy; y++){
info.nProgress = (int32_t)(100*y/newy);
if (info.nEscape) break;
f_y = (float) y * yScale - 0.5f;
i_y = (int32_t) floor(f_y);
a = f_y - (float)floor(f_y);
for(int32_t x=0; x<newx; x++){
f_x = (float) x * xScale - 0.5f;
i_x = (int32_t) floor(f_x);
b = f_x - (float)floor(f_x);
rr = gg = bb = 0.0f;
for(int32_t m=-1; m<3; m++) {
r1 = KernelBSpline((float) m - a);
yy = i_y+m;
if (yy<0) yy=0;
if (yy>=head.biHeight) yy = head.biHeight-1;
for(int32_t n=-1; n<3; n++) {
r2 = r1 * KernelBSpline(b - (float)n);
xx = i_x+n;
if (xx<0) xx=0;
if (xx>=head.biWidth) xx=head.biWidth-1;
if (head.biClrUsed){
rgb = GetPixelColor(xx,yy);
} else {
iDst = info.pImage + yy*info.dwEffWidth + xx*3;
rgb.rgbBlue = *iDst++;
rgb.rgbGreen= *iDst++;
rgb.rgbRed = *iDst;
}
rr += rgb.rgbRed * r2;
gg += rgb.rgbGreen * r2;
bb += rgb.rgbBlue * r2;
}
}
if (head.biClrUsed)
newImage.SetPixelColor(x,y,RGB(rr,gg,bb));
else {
iDst = newImage.info.pImage + y*newImage.info.dwEffWidth + x*3;
*iDst++ = (uint8_t)bb;
*iDst++ = (uint8_t)gg;
*iDst = (uint8_t)rr;
}
}
}
break;
}
default: // bilinear interpolation
if (!(head.biWidth>newx && head.biHeight>newy && head.biBitCount==24)) {
// (c) 1999 Steve McMahon (steve@dogma.demon.co.uk)
int32_t ifX, ifY, ifX1, ifY1, xmax, ymax;
float ir1, ir2, ig1, ig2, ib1, ib2, dx, dy;
uint8_t r,g,b;
RGBQUAD rgb1, rgb2, rgb3, rgb4;
xmax = head.biWidth-1;
ymax = head.biHeight-1;
for(int32_t y=0; y<newy; y++){
info.nProgress = (int32_t)(100*y/newy);
if (info.nEscape) break;
fY = y * yScale;
ifY = (int32_t)fY;
ifY1 = min(ymax, ifY+1);
dy = fY - ifY;
for(int32_t x=0; x<newx; x++){
fX = x * xScale;
ifX = (int32_t)fX;
ifX1 = min(xmax, ifX+1);
dx = fX - ifX;
// Interpolate using the four nearest pixels in the source
if (head.biClrUsed){
rgb1=GetPaletteColor(GetPixelIndex(ifX,ifY));
rgb2=GetPaletteColor(GetPixelIndex(ifX1,ifY));
rgb3=GetPaletteColor(GetPixelIndex(ifX,ifY1));
rgb4=GetPaletteColor(GetPixelIndex(ifX1,ifY1));
}
else {
uint8_t* iDst;
iDst = info.pImage + ifY*info.dwEffWidth + ifX*3;
rgb1.rgbBlue = *iDst++; rgb1.rgbGreen= *iDst++; rgb1.rgbRed =*iDst;
iDst = info.pImage + ifY*info.dwEffWidth + ifX1*3;
rgb2.rgbBlue = *iDst++; rgb2.rgbGreen= *iDst++; rgb2.rgbRed =*iDst;
iDst = info.pImage + ifY1*info.dwEffWidth + ifX*3;
rgb3.rgbBlue = *iDst++; rgb3.rgbGreen= *iDst++; rgb3.rgbRed =*iDst;
iDst = info.pImage + ifY1*info.dwEffWidth + ifX1*3;
rgb4.rgbBlue = *iDst++; rgb4.rgbGreen= *iDst++; rgb4.rgbRed =*iDst;
}
// Interplate in x direction:
ir1 = rgb1.rgbRed + (rgb3.rgbRed - rgb1.rgbRed) * dy;
ig1 = rgb1.rgbGreen + (rgb3.rgbGreen - rgb1.rgbGreen) * dy;
ib1 = rgb1.rgbBlue + (rgb3.rgbBlue - rgb1.rgbBlue) * dy;
ir2 = rgb2.rgbRed + (rgb4.rgbRed - rgb2.rgbRed) * dy;
ig2 = rgb2.rgbGreen + (rgb4.rgbGreen - rgb2.rgbGreen) * dy;
ib2 = rgb2.rgbBlue + (rgb4.rgbBlue - rgb2.rgbBlue) * dy;
// Interpolate in y:
r = (uint8_t)(ir1 + (ir2-ir1) * dx);
g = (uint8_t)(ig1 + (ig2-ig1) * dx);
b = (uint8_t)(ib1 + (ib2-ib1) * dx);
// Set output
newImage.SetPixelColor(x,y,RGB(r,g,b));
}
}
} else {
//high resolution shrink, thanks to Henrik Stellmann <henrik.stellmann@volleynet.de>
const int32_t ACCURACY = 1000;
int32_t i,j; // index for faValue
int32_t x,y; // coordinates in source image
uint8_t* pSource;
uint8_t* pDest = newImage.info.pImage;
int32_t* naAccu = new int32_t[3 * newx + 3];
int32_t* naCarry = new int32_t[3 * newx + 3];
int32_t* naTemp;
int32_t nWeightX,nWeightY;
float fEndX;
int32_t nScale = (int32_t)(ACCURACY * xScale * yScale);
memset(naAccu, 0, sizeof(int32_t) * 3 * newx);
memset(naCarry, 0, sizeof(int32_t) * 3 * newx);
int32_t u, v = 0; // coordinates in dest image
float fEndY = yScale - 1.0f;
for (y = 0; y < head.biHeight; y++){
info.nProgress = (int32_t)(100*y/head.biHeight); //<Anatoly Ivasyuk>
if (info.nEscape) break;
pSource = info.pImage + y * info.dwEffWidth;
u = i = 0;
fEndX = xScale - 1.0f;
if ((float)y < fEndY) { // complete source row goes into dest row
for (x = 0; x < head.biWidth; x++){
if ((float)x < fEndX){ // complete source pixel goes into dest pixel
for (j = 0; j < 3; j++) naAccu[i + j] += (*pSource++) * ACCURACY;
} else { // source pixel is splitted for 2 dest pixels
nWeightX = (int32_t)(((float)x - fEndX) * ACCURACY);
for (j = 0; j < 3; j++){
naAccu[i] += (ACCURACY - nWeightX) * (*pSource);
naAccu[3 + i++] += nWeightX * (*pSource++);
}
fEndX += xScale;
u++;
}
}
} else { // source row is splitted for 2 dest rows
nWeightY = (int32_t)(((float)y - fEndY) * ACCURACY);
for (x = 0; x < head.biWidth; x++){
if ((float)x < fEndX){ // complete source pixel goes into 2 pixel
for (j = 0; j < 3; j++){
naAccu[i + j] += ((ACCURACY - nWeightY) * (*pSource));
naCarry[i + j] += nWeightY * (*pSource++);
}
} else { // source pixel is splitted for 4 dest pixels
nWeightX = (int32_t)(((float)x - fEndX) * ACCURACY);
for (j = 0; j < 3; j++) {
naAccu[i] += ((ACCURACY - nWeightY) * (ACCURACY - nWeightX)) * (*pSource) / ACCURACY;
*pDest++ = (uint8_t)(naAccu[i] / nScale);
naCarry[i] += (nWeightY * (ACCURACY - nWeightX) * (*pSource)) / ACCURACY;
naAccu[i + 3] += ((ACCURACY - nWeightY) * nWeightX * (*pSource)) / ACCURACY;
naCarry[i + 3] = (nWeightY * nWeightX * (*pSource)) / ACCURACY;
i++;
pSource++;
}
fEndX += xScale;
u++;
}
}
if (u < newx){ // possibly not completed due to rounding errors
for (j = 0; j < 3; j++) *pDest++ = (uint8_t)(naAccu[i++] / nScale);
}
naTemp = naCarry;
naCarry = naAccu;
naAccu = naTemp;
memset(naCarry, 0, sizeof(int32_t) * 3); // need only to set first pixel zero
pDest = newImage.info.pImage + (++v * newImage.info.dwEffWidth);
fEndY += yScale;
}
}
if (v < newy){ // possibly not completed due to rounding errors
for (i = 0; i < 3 * newx; i++) *pDest++ = (uint8_t)(naAccu[i] / nScale);
}
delete [] naAccu;
delete [] naCarry;
}
}
#if CXIMAGE_SUPPORT_ALPHA
if (AlphaIsValid()){
if (1 == mode){
newImage.AlphaCreate();
for(int32_t y=0; y<newy; y++){
fY = y * yScale;
for(int32_t x=0; x<newx; x++){
fX = x * xScale;
newImage.AlphaSet(x,y,AlphaGet((int32_t)fX,(int32_t)fY));
}
}
} else {
CxImage newAlpha;
AlphaSplit(&newAlpha);
newAlpha.Resample(newx, newy, mode);
newImage.AlphaSet(newAlpha);
}
}
#endif //CXIMAGE_SUPPORT_ALPHA
//select the destination
if (iDst) iDst->Transfer(newImage);
else Transfer(newImage);
return true;
}
////////////////////////////////////////////////////////////////////////////////
/**
* New simpler resample. Adds new interpolation methods and simplifies code (using GetPixelColorInterpolated
* and GetAreaColorInterpolated). It also (unlike old method) interpolates alpha layer.
*
* \param newx, newy - size of resampled image
* \param inMethod - interpolation method to use (see comments at GetPixelColorInterpolated)
* If image size is being reduced, averaging is used instead (or simultaneously with) inMethod.
* \param ofMethod - what to replace outside pixels by (only significant for bordering pixels of enlarged image)
* \param iDst - pointer to destination CxImage or NULL.
* \param disableAveraging - force no averaging when shrinking images (Produces aliasing.
* You probably just want to leave this off...)
*
* \author ***bd*** 2.2004
*/
bool CxImage::Resample2(
int32_t newx, int32_t newy,
InterpolationMethod const inMethod,
OverflowMethod const ofMethod,
CxImage* const iDst,
bool const disableAveraging)
{
if (newx<=0 || newy<=0 || !pDib) return false;
if (head.biWidth==newx && head.biHeight==newy) {
//image already correct size (just copy and return)
if (iDst) iDst->Copy(*this);
return true;
}//if
//calculate scale of new image (less than 1 for enlarge)
float xScale, yScale;
xScale = (float)head.biWidth / (float)newx;
yScale = (float)head.biHeight / (float)newy;
//create temporary destination image
CxImage newImage;
newImage.CopyInfo(*this);
newImage.Create(newx,newy,head.biBitCount,GetType());
newImage.SetPalette(GetPalette());
if (!newImage.IsValid()){
strcpy(info.szLastError,newImage.GetLastError());
return false;
}
//and alpha channel if required
#if CXIMAGE_SUPPORT_ALPHA
if (AlphaIsValid()) newImage.AlphaCreate();
uint8_t *pxptra = 0; // destination alpha data
#endif
float sX, sY; //source location
int32_t dX,dY; //destination pixel (int32_t value)
if ((xScale<=1 && yScale<=1) || disableAveraging) {
//image is being enlarged (or interpolation on demand)
if (!IsIndexed()) {
//RGB24 image (optimized version with direct writes)
RGBQUAD q; //pixel colour
uint8_t *pxptr; //pointer to destination pixel
for(dY=0; dY<newy; dY++){
info.nProgress = (int32_t)(100*dY/newy);
if (info.nEscape) break;
sY = (dY + 0.5f) * yScale - 0.5f;
pxptr=(uint8_t*)(newImage.BlindGetPixelPointer(0,dY));
#if CXIMAGE_SUPPORT_ALPHA
pxptra=newImage.AlphaGetPointer(0,dY);
#endif
for(dX=0; dX<newx; dX++){
sX = (dX + 0.5f) * xScale - 0.5f;
q=GetPixelColorInterpolated(sX,sY,inMethod,ofMethod,0);
*pxptr++=q.rgbBlue;
*pxptr++=q.rgbGreen;
*pxptr++=q.rgbRed;
#if CXIMAGE_SUPPORT_ALPHA
if (pxptra) *pxptra++=q.rgbReserved;
#endif
}//for dX
}//for dY
} else {
//enlarge paletted image. Slower method.
for(dY=0; dY<newy; dY++){
info.nProgress = (int32_t)(100*dY/newy);
if (info.nEscape) break;
sY = (dY + 0.5f) * yScale - 0.5f;
for(dX=0; dX<newx; dX++){
sX = (dX + 0.5f) * xScale - 0.5f;
newImage.SetPixelColor(dX,dY,GetPixelColorInterpolated(sX,sY,inMethod,ofMethod,0),true);
}//for x
}//for y
}//if
} else {
//image size is being reduced (averaging enabled)
for(dY=0; dY<newy; dY++){
info.nProgress = (int32_t)(100*dY/newy); if (info.nEscape) break;
sY = (dY+0.5f) * yScale - 0.5f;
for(dX=0; dX<newx; dX++){
sX = (dX+0.5f) * xScale - 0.5f;
newImage.SetPixelColor(dX,dY,GetAreaColorInterpolated(sX, sY, xScale, yScale, inMethod, ofMethod,0),true);
}//for x
}//for y
}//if
#if CXIMAGE_SUPPORT_ALPHA
if (AlphaIsValid() && pxptra == 0){
for(int32_t y=0; y<newy; y++){
dY = (int32_t)(y * yScale);
for(int32_t x=0; x<newx; x++){
dX = (int32_t)(x * xScale);
newImage.AlphaSet(x,y,AlphaGet(dX,dY));
}
}
}
#endif //CXIMAGE_SUPPORT_ALPHA
//copy new image to the destination
if (iDst)
iDst->Transfer(newImage);
else
Transfer(newImage);
return true;
}
////////////////////////////////////////////////////////////////////////////////
/**
* Reduces the number of bits per pixel to nbit (1, 4 or 8).
* ppal points to a valid palette for the final image; if not supplied the function will use a standard palette.
* ppal is not necessary for reduction to 1 bpp.
*/
bool CxImage::DecreaseBpp(uint32_t nbit, bool errordiffusion, RGBQUAD* ppal, uint32_t clrimportant)
{
if (!pDib) return false;
if (head.biBitCount < nbit){
strcpy(info.szLastError,"DecreaseBpp: target BPP greater than source BPP");
return false;
}
if (head.biBitCount == nbit){
if (clrimportant==0) return true;
if (head.biClrImportant && (head.biClrImportant<clrimportant)) return true;
}
int32_t er,eg,eb;
RGBQUAD c,ce;
CxImage tmp;
tmp.CopyInfo(*this);
tmp.Create(head.biWidth,head.biHeight,(uint16_t)nbit,info.dwType);
if (clrimportant) tmp.SetClrImportant(clrimportant);
if (!tmp.IsValid()){
strcpy(info.szLastError,tmp.GetLastError());
return false;
}
#if CXIMAGE_SUPPORT_SELECTION
tmp.SelectionCopy(*this);
#endif //CXIMAGE_SUPPORT_SELECTION
#if CXIMAGE_SUPPORT_ALPHA
tmp.AlphaCopy(*this);
#endif //CXIMAGE_SUPPORT_ALPHA
if (ppal) {
if (clrimportant) {
tmp.SetPalette(ppal,clrimportant);
} else {
tmp.SetPalette(ppal,1<<tmp.head.biBitCount);
}
} else {
tmp.SetStdPalette();
}
for (int32_t y=0;y<head.biHeight;y++){
if (info.nEscape) break;
info.nProgress = (int32_t)(100*y/head.biHeight);
for (int32_t x=0;x<head.biWidth;x++){
if (!errordiffusion){
tmp.BlindSetPixelColor(x,y,BlindGetPixelColor(x,y));
} else {
c = BlindGetPixelColor(x,y);
tmp.BlindSetPixelColor(x,y,c);
ce = tmp.BlindGetPixelColor(x,y);
er=(int32_t)c.rgbRed - (int32_t)ce.rgbRed;
eg=(int32_t)c.rgbGreen - (int32_t)ce.rgbGreen;
eb=(int32_t)c.rgbBlue - (int32_t)ce.rgbBlue;
c = GetPixelColor(x+1,y);
c.rgbRed = (uint8_t)min(255L,max(0L,(int32_t)c.rgbRed + ((er*7)/16)));
c.rgbGreen = (uint8_t)min(255L,max(0L,(int32_t)c.rgbGreen + ((eg*7)/16)));
c.rgbBlue = (uint8_t)min(255L,max(0L,(int32_t)c.rgbBlue + ((eb*7)/16)));
SetPixelColor(x+1,y,c);
int32_t coeff=1;
for(int32_t i=-1; i<2; i++){
switch(i){
case -1:
coeff=2; break;
case 0:
coeff=4; break;
case 1:
coeff=1; break;
}
c = GetPixelColor(x+i,y+1);
c.rgbRed = (uint8_t)min(255L,max(0L,(int32_t)c.rgbRed + ((er * coeff)/16)));
c.rgbGreen = (uint8_t)min(255L,max(0L,(int32_t)c.rgbGreen + ((eg * coeff)/16)));
c.rgbBlue = (uint8_t)min(255L,max(0L,(int32_t)c.rgbBlue + ((eb * coeff)/16)));
SetPixelColor(x+i,y+1,c);
}
}
}
}
Transfer(tmp);
return true;
}
////////////////////////////////////////////////////////////////////////////////
/**
* Converts the image to B&W using the desired method :
* - 0 = Floyd-Steinberg
* - 1 = Ordered-Dithering (4x4)
* - 2 = Burkes
* - 3 = Stucki
* - 4 = Jarvis-Judice-Ninke
* - 5 = Sierra
* - 6 = Stevenson-Arce
* - 7 = Bayer (4x4 ordered dithering)
* - 8 = Bayer (8x8 ordered dithering)
* - 9 = Bayer (16x16 ordered dithering)
*/
bool CxImage::Dither(int32_t method)
{
if (!pDib) return false;
if (head.biBitCount == 1) return true;
GrayScale();
CxImage tmp;
tmp.CopyInfo(*this);
tmp.Create(head.biWidth, head.biHeight, 1, info.dwType);
if (!tmp.IsValid()){
strcpy(info.szLastError,tmp.GetLastError());
return false;
}
#if CXIMAGE_SUPPORT_SELECTION
tmp.SelectionCopy(*this);
#endif //CXIMAGE_SUPPORT_SELECTION
#if CXIMAGE_SUPPORT_ALPHA
tmp.AlphaCopy(*this);
#endif //CXIMAGE_SUPPORT_ALPHA
switch (method){
case 1:
{
// Multi-Level Ordered-Dithering by Kenny Hoff (Oct. 12, 1995)
#define dth_NumRows 4
#define dth_NumCols 4
#define dth_NumIntensityLevels 2
#define dth_NumRowsLessOne (dth_NumRows-1)
#define dth_NumColsLessOne (dth_NumCols-1)
#define dth_RowsXCols (dth_NumRows*dth_NumCols)
#define dth_MaxIntensityVal 255
#define dth_MaxDitherIntensityVal (dth_NumRows*dth_NumCols*(dth_NumIntensityLevels-1))
int32_t DitherMatrix[dth_NumRows][dth_NumCols] = {{0,8,2,10}, {12,4,14,6}, {3,11,1,9}, {15,7,13,5} };
uint8_t Intensity[dth_NumIntensityLevels] = { 0,1 }; // 2 LEVELS B/W
//uint8_t Intensity[NumIntensityLevels] = { 0,255 }; // 2 LEVELS
//uint8_t Intensity[NumIntensityLevels] = { 0,127,255 }; // 3 LEVELS
//uint8_t Intensity[NumIntensityLevels] = { 0,85,170,255 }; // 4 LEVELS
//uint8_t Intensity[NumIntensityLevels] = { 0,63,127,191,255 }; // 5 LEVELS
//uint8_t Intensity[NumIntensityLevels] = { 0,51,102,153,204,255 }; // 6 LEVELS
//uint8_t Intensity[NumIntensityLevels] = { 0,42,85,127,170,213,255 }; // 7 LEVELS
//uint8_t Intensity[NumIntensityLevels] = { 0,36,73,109,145,182,219,255 }; // 8 LEVELS
int32_t DitherIntensity, DitherMatrixIntensity, Offset, DeviceIntensity;
uint8_t DitherValue;
for (int32_t y=0;y<head.biHeight;y++){
info.nProgress = (int32_t)(100*y/head.biHeight);
if (info.nEscape) break;
for (int32_t x=0;x<head.biWidth;x++){
DeviceIntensity = BlindGetPixelIndex(x,y);
DitherIntensity = DeviceIntensity*dth_MaxDitherIntensityVal/dth_MaxIntensityVal;
DitherMatrixIntensity = DitherIntensity % dth_RowsXCols;
Offset = DitherIntensity / dth_RowsXCols;
if (DitherMatrix[y&dth_NumRowsLessOne][x&dth_NumColsLessOne] < DitherMatrixIntensity)
DitherValue = Intensity[1+Offset];
else
DitherValue = Intensity[0+Offset];
tmp.BlindSetPixelIndex(x,y,DitherValue);
}
}
break;
}
case 2:
{
//Burkes error diffusion (Thanks to Franco Gerevini)
int32_t TotalCoeffSum = 32;
int32_t error, nlevel, coeff=1;
uint8_t level;
for (int32_t y = 0; y < head.biHeight; y++) {
info.nProgress = (int32_t)(100 * y / head.biHeight);
if (info.nEscape)
break;
for (int32_t x = 0; x < head.biWidth; x++) {
level = BlindGetPixelIndex(x, y);
if (level > 128) {
tmp.SetPixelIndex(x, y, 1);
error = level - 255;
} else {
tmp.SetPixelIndex(x, y, 0);
error = level;
}
nlevel = GetPixelIndex(x + 1, y) + (error * 8) / TotalCoeffSum;
level = (uint8_t)min(255, max(0, (int32_t)nlevel));
SetPixelIndex(x + 1, y, level);
nlevel = GetPixelIndex(x + 2, y) + (error * 4) / TotalCoeffSum;
level = (uint8_t)min(255, max(0, (int32_t)nlevel));
SetPixelIndex(x + 2, y, level);
int32_t i;
for (i = -2; i < 3; i++) {
switch (i) {
case -2:
coeff = 2;
break;
case -1:
coeff = 4;
break;
case 0:
coeff = 8;
break;
case 1:
coeff = 4;
break;
case 2:
coeff = 2;
break;
}
nlevel = GetPixelIndex(x + i, y + 1) + (error * coeff) / TotalCoeffSum;
level = (uint8_t)min(255, max(0, (int32_t)nlevel));
SetPixelIndex(x + i, y + 1, level);
}
}
}
break;
}
case 3:
{
//Stucki error diffusion (Thanks to Franco Gerevini)
int32_t TotalCoeffSum = 42;
int32_t error, nlevel, coeff=1;
uint8_t level;
for (int32_t y = 0; y < head.biHeight; y++) {
info.nProgress = (int32_t)(100 * y / head.biHeight);
if (info.nEscape)
break;
for (int32_t x = 0; x < head.biWidth; x++) {
level = BlindGetPixelIndex(x, y);
if (level > 128) {
tmp.SetPixelIndex(x, y, 1);
error = level - 255;
} else {
tmp.SetPixelIndex(x, y, 0);
error = level;
}
nlevel = GetPixelIndex(x + 1, y) + (error * 8) / TotalCoeffSum;
level = (uint8_t)min(255, max(0, (int32_t)nlevel));
SetPixelIndex(x + 1, y, level);
nlevel = GetPixelIndex(x + 2, y) + (error * 4) / TotalCoeffSum;
level = (uint8_t)min(255, max(0, (int32_t)nlevel));
SetPixelIndex(x + 2, y, level);
int32_t i;
for (i = -2; i < 3; i++) {
switch (i) {
case -2:
coeff = 2;
break;
case -1:
coeff = 4;
break;
case 0:
coeff = 8;
break;
case 1:
coeff = 4;
break;
case 2:
coeff = 2;
break;
}
nlevel = GetPixelIndex(x + i, y + 1) + (error * coeff) / TotalCoeffSum;
level = (uint8_t)min(255, max(0, (int32_t)nlevel));
SetPixelIndex(x + i, y + 1, level);
}
for (i = -2; i < 3; i++) {
switch (i) {
case -2:
coeff = 1;
break;
case -1:
coeff = 2;
break;
case 0:
coeff = 4;
break;
case 1:
coeff = 2;
break;
case 2:
coeff = 1;
break;
}
nlevel = GetPixelIndex(x + i, y + 2) + (error * coeff) / TotalCoeffSum;
level = (uint8_t)min(255, max(0, (int32_t)nlevel));
SetPixelIndex(x + i, y + 2, level);
}
}
}
break;
}
case 4:
{
//Jarvis, Judice and Ninke error diffusion (Thanks to Franco Gerevini)
int32_t TotalCoeffSum = 48;
int32_t error, nlevel, coeff=1;
uint8_t level;
for (int32_t y = 0; y < head.biHeight; y++) {
info.nProgress = (int32_t)(100 * y / head.biHeight);
if (info.nEscape)
break;
for (int32_t x = 0; x < head.biWidth; x++) {
level = BlindGetPixelIndex(x, y);
if (level > 128) {
tmp.SetPixelIndex(x, y, 1);
error = level - 255;
} else {
tmp.SetPixelIndex(x, y, 0);
error = level;
}
nlevel = GetPixelIndex(x + 1, y) + (error * 7) / TotalCoeffSum;
level = (uint8_t)min(255, max(0, (int32_t)nlevel));
SetPixelIndex(x + 1, y, level);
nlevel = GetPixelIndex(x + 2, y) + (error * 5) / TotalCoeffSum;
level = (uint8_t)min(255, max(0, (int32_t)nlevel));
SetPixelIndex(x + 2, y, level);
int32_t i;
for (i = -2; i < 3; i++) {
switch (i) {
case -2:
coeff = 3;
break;
case -1:
coeff = 5;
break;
case 0:
coeff = 7;
break;
case 1:
coeff = 5;
break;
case 2:
coeff = 3;
break;
}
nlevel = GetPixelIndex(x + i, y + 1) + (error * coeff) / TotalCoeffSum;
level = (uint8_t)min(255, max(0, (int32_t)nlevel));
SetPixelIndex(x + i, y + 1, level);
}
for (i = -2; i < 3; i++) {
switch (i) {
case -2:
coeff = 1;
break;
case -1:
coeff = 3;
break;
case 0:
coeff = 5;
break;
case 1:
coeff = 3;
break;
case 2:
coeff = 1;
break;
}
nlevel = GetPixelIndex(x + i, y + 2) + (error * coeff) / TotalCoeffSum;
level = (uint8_t)min(255, max(0, (int32_t)nlevel));
SetPixelIndex(x + i, y + 2, level);
}
}
}
break;
}
case 5:
{
//Sierra error diffusion (Thanks to Franco Gerevini)
int32_t TotalCoeffSum = 32;
int32_t error, nlevel, coeff=1;
uint8_t level;
for (int32_t y = 0; y < head.biHeight; y++) {
info.nProgress = (int32_t)(100 * y / head.biHeight);
if (info.nEscape)
break;
for (int32_t x = 0; x < head.biWidth; x++) {
level = BlindGetPixelIndex(x, y);
if (level > 128) {
tmp.SetPixelIndex(x, y, 1);
error = level - 255;
} else {
tmp.SetPixelIndex(x, y, 0);
error = level;
}
nlevel = GetPixelIndex(x + 1, y) + (error * 5) / TotalCoeffSum;
level = (uint8_t)min(255, max(0, (int32_t)nlevel));
SetPixelIndex(x + 1, y, level);
nlevel = GetPixelIndex(x + 2, y) + (error * 3) / TotalCoeffSum;
level = (uint8_t)min(255, max(0, (int32_t)nlevel));
SetPixelIndex(x + 2, y, level);
int32_t i;
for (i = -2; i < 3; i++) {
switch (i) {
case -2:
coeff = 2;
break;
case -1:
coeff = 4;
break;
case 0:
coeff = 5;
break;
case 1:
coeff = 4;
break;
case 2:
coeff = 2;
break;
}
nlevel = GetPixelIndex(x + i, y + 1) + (error * coeff) / TotalCoeffSum;
level = (uint8_t)min(255, max(0, (int32_t)nlevel));
SetPixelIndex(x + i, y + 1, level);
}
for (i = -1; i < 2; i++) {
switch (i) {
case -1:
coeff = 2;
break;
case 0:
coeff = 3;
break;
case 1:
coeff = 2;
break;
}
nlevel = GetPixelIndex(x + i, y + 2) + (error * coeff) / TotalCoeffSum;
level = (uint8_t)min(255, max(0, (int32_t)nlevel));
SetPixelIndex(x + i, y + 2, level);
}
}
}
break;
}
case 6:
{
//Stevenson and Arce error diffusion (Thanks to Franco Gerevini)
int32_t TotalCoeffSum = 200;
int32_t error, nlevel;
uint8_t level;
for (int32_t y = 0; y < head.biHeight; y++) {
info.nProgress = (int32_t)(100 * y / head.biHeight);
if (info.nEscape)
break;
for (int32_t x = 0; x < head.biWidth; x++) {
level = BlindGetPixelIndex(x, y);
if (level > 128) {
tmp.SetPixelIndex(x, y, 1);
error = level - 255;
} else {
tmp.SetPixelIndex(x, y, 0);
error = level;
}
int32_t tmp_index_x = x + 2;
int32_t tmp_index_y = y;
int32_t tmp_coeff = 32;
nlevel = GetPixelIndex(tmp_index_x, tmp_index_y) + (error * tmp_coeff) / TotalCoeffSum;
level = (uint8_t)min(255, max(0, (int32_t)nlevel));
SetPixelIndex(tmp_index_x, tmp_index_y, level);
tmp_index_x = x - 3;
tmp_index_y = y + 1;
tmp_coeff = 12;
nlevel = GetPixelIndex(tmp_index_x, tmp_index_y) + (error * tmp_coeff) / TotalCoeffSum;
level = (uint8_t)min(255, max(0, (int32_t)nlevel));
SetPixelIndex(tmp_index_x, tmp_index_y, level);
tmp_index_x = x - 1;
tmp_coeff = 26;
nlevel = GetPixelIndex(tmp_index_x, tmp_index_y) + (error * tmp_coeff) / TotalCoeffSum;
level = (uint8_t)min(255, max(0, (int32_t)nlevel));
SetPixelIndex(tmp_index_x, tmp_index_y, level);
tmp_index_x = x + 1;
tmp_coeff = 30;
nlevel = GetPixelIndex(tmp_index_x, tmp_index_y) + (error * tmp_coeff) / TotalCoeffSum;
level = (uint8_t)min(255, max(0, (int32_t)nlevel));
SetPixelIndex(tmp_index_x, tmp_index_y, level);
tmp_index_x = x + 3;
tmp_coeff = 16;
nlevel = GetPixelIndex(tmp_index_x, tmp_index_y) + (error * tmp_coeff) / TotalCoeffSum;
level = (uint8_t)min(255, max(0, (int32_t)nlevel));
SetPixelIndex(tmp_index_x, tmp_index_y, level);
tmp_index_x = x - 2;
tmp_index_y = y + 2;
tmp_coeff = 12;
nlevel = GetPixelIndex(tmp_index_x, tmp_index_y) + (error * tmp_coeff) / TotalCoeffSum;
level = (uint8_t)min(255, max(0, (int32_t)nlevel));
SetPixelIndex(tmp_index_x, tmp_index_y, level);
tmp_index_x = x;
tmp_coeff = 26;
nlevel = GetPixelIndex(tmp_index_x, tmp_index_y) + (error * tmp_coeff) / TotalCoeffSum;
level = (uint8_t)min(255, max(0, (int32_t)nlevel));
SetPixelIndex(tmp_index_x, tmp_index_y, level);
tmp_index_x = x + 2;
tmp_coeff = 12;
nlevel = GetPixelIndex(tmp_index_x, tmp_index_y) + (error * tmp_coeff) / TotalCoeffSum;
level = (uint8_t)min(255, max(0, (int32_t)nlevel));
SetPixelIndex(tmp_index_x, tmp_index_y, level);
tmp_index_x = x - 3;
tmp_index_y = y + 3;
tmp_coeff = 5;
nlevel = GetPixelIndex(tmp_index_x, tmp_index_y) + (error * tmp_coeff) / TotalCoeffSum;
level = (uint8_t)min(255, max(0, (int32_t)nlevel));
SetPixelIndex(tmp_index_x, tmp_index_y, level);
tmp_index_x = x - 1;
tmp_coeff = 12;
nlevel = GetPixelIndex(tmp_index_x, tmp_index_y) + (error * tmp_coeff) / TotalCoeffSum;
level = (uint8_t)min(255, max(0, (int32_t)nlevel));
SetPixelIndex(tmp_index_x, tmp_index_y, level);
tmp_index_x = x + 1;
tmp_coeff = 12;
nlevel = GetPixelIndex(tmp_index_x, tmp_index_y) + (error * tmp_coeff) / TotalCoeffSum;
level = (uint8_t)min(255, max(0, (int32_t)nlevel));
SetPixelIndex(tmp_index_x, tmp_index_y, level);
tmp_index_x = x + 3;
tmp_coeff = 5;
nlevel = GetPixelIndex(tmp_index_x, tmp_index_y) + (error * tmp_coeff) / TotalCoeffSum;
level = (uint8_t)min(255, max(0, (int32_t)nlevel));
SetPixelIndex(tmp_index_x, tmp_index_y, level);
}
}
break;
}
case 7:
{
// Bayer ordered dither
int32_t order = 4;
//create Bayer matrix
if (order>4) order = 4;
int32_t size = (1 << (2*order));
uint8_t* Bmatrix = (uint8_t*) malloc(size * sizeof(uint8_t));
for(int32_t i = 0; i < size; i++) {
int32_t n = order;
int32_t x = i / n;
int32_t y = i % n;
int32_t dither = 0;
while (n-- > 0){
dither = (((dither<<1)|((x&1) ^ (y&1)))<<1) | (y&1);
x >>= 1;
y >>= 1;
}
Bmatrix[i] = (uint8_t)(dither);
}
int32_t scale = max(0,(8-2*order));
int32_t level;
for (int32_t y=0;y<head.biHeight;y++){
info.nProgress = (int32_t)(100*y/head.biHeight);
if (info.nEscape) break;
for (int32_t x=0;x<head.biWidth;x++){
level = BlindGetPixelIndex(x,y) >> scale;
if(level > Bmatrix[ (x % order) + order * (y % order) ]){
tmp.SetPixelIndex(x,y,1);
} else {
tmp.SetPixelIndex(x,y,0);
}
}
}
free(Bmatrix);
break;
}
case 8:
{
// 8x8 Bayer ordered dither
int32_t const pattern8x8[8][8] = {
{ 0, 32, 8, 40, 2, 34, 10, 42}, /* 8x8 Bayer ordered dithering */
{48, 16, 56, 24, 50, 18, 58, 26}, /* pattern. Each input pixel */
{12, 44, 4, 36, 14, 46, 6, 38}, /* is scaled to the 0..63 range */
{60, 28, 52, 20, 62, 30, 54, 22}, /* before looking in this table */
{ 3, 35, 11, 43, 1, 33, 9, 41}, /* to determine the action. */
{51, 19, 59, 27, 49, 17, 57, 25},
{15, 47, 7, 39, 13, 45, 5, 37},
{63, 31, 55, 23, 61, 29, 53, 21} };
for (int32_t y=0;y<head.biHeight;y++){
info.nProgress = (int32_t)(100*y/head.biHeight);
if (info.nEscape) break;
for (int32_t x=0;x<head.biWidth;x++){
int32_t level = BlindGetPixelIndex(x,y) >> 2;
if(level && level >= pattern8x8[x & 7][y & 7]){
tmp.SetPixelIndex(x,y,1);
} else {
tmp.SetPixelIndex(x,y,0);
}
}
}
break;
}
case 9:
{
// 16x16 Bayer ordered dither
int32_t const pattern16x16[16][16] = {
{ 1,235, 59,219, 15,231, 55,215, 2,232, 56,216, 12,228, 52,212},
{ 129, 65,187,123,143, 79,183,119,130, 66,184,120,140, 76,180,116},
{ 33,193, 17,251, 47,207, 31,247, 34,194, 18,248, 44,204, 28,244},
{ 161, 97,145, 81,175,111,159, 95,162, 98,146, 82,172,108,156, 92},
{ 9,225, 49,209, 5,239, 63,223, 10,226, 50,210, 6,236, 60,220},
{ 137, 73,177,113,133, 69,191,127,138, 74,178,114,134, 70,188,124},
{ 41,201, 25,241, 37,197, 21,255, 42,202, 26,242, 38,198, 22,252},
{ 169,105,153, 89,165,101,149, 85,170,106,154, 90,166,102,150, 86},
{ 3,233, 57,217, 13,229, 53,213, 0,234, 58,218, 14,230, 54,214},
{ 131, 67,185,121,141, 77,181,117,128, 64,186,122,142, 78,182,118},
{ 35,195, 19,249, 45,205, 29,245, 32,192, 16,250, 46,206, 30,246},
{ 163, 99,147, 83,173,109,157, 93,160, 96,144, 80,174,110,158, 94},
{ 11,227, 51,211, 7,237, 61,221, 8,224, 48,208, 4,238, 62,222},
{ 139, 75,179,115,135, 71,189,125,136, 72,176,112,132, 68,190,126},
{ 43,203, 27,243, 39,199, 23,253, 40,200, 24,240, 36,196, 20,254},
{ 171,107,155, 91,167,103,151, 87,168,104,152, 88,164,100,148, 84}
};
for (int32_t y=0;y<head.biHeight;y++){
info.nProgress = (int32_t)(100*y/head.biHeight);
if (info.nEscape) break;
for (int32_t x=0;x<head.biWidth;x++){
if (BlindGetPixelIndex(x,y) > pattern16x16[x & 15][y & 15]){
tmp.SetPixelIndex(x,y,1);
} else {
tmp.SetPixelIndex(x,y,0);
}
}
}
break;
}
default:
{
// Floyd-Steinberg error diffusion (Thanks to Steve McMahon)
int32_t error,nlevel,coeff=1;
uint8_t level;
for (int32_t y=0;y<head.biHeight;y++){
info.nProgress = (int32_t)(100*y/head.biHeight);
if (info.nEscape) break;
for (int32_t x=0;x<head.biWidth;x++){
level = BlindGetPixelIndex(x,y);
if (level > 128){
tmp.SetPixelIndex(x,y,1);
error = level-255;
} else {
tmp.SetPixelIndex(x,y,0);
error = level;
}
nlevel = GetPixelIndex(x+1,y) + (error * 7)/16;
level = (uint8_t)min(255,max(0,(int32_t)nlevel));
SetPixelIndex(x+1,y,level);
for(int32_t i=-1; i<2; i++){
switch(i){
case -1:
coeff=3; break;
case 0:
coeff=5; break;
case 1:
coeff=1; break;
}
nlevel = GetPixelIndex(x+i,y+1) + (error * coeff)/16;
level = (uint8_t)min(255,max(0,(int32_t)nlevel));
SetPixelIndex(x+i,y+1,level);
}
}
}
}
}
tmp.SetPaletteColor(0,0,0,0);
tmp.SetPaletteColor(1,255,255,255);
Transfer(tmp);
return true;
}
////////////////////////////////////////////////////////////////////////////////
/**
* CropRotatedRectangle
* \param topx,topy : topmost and leftmost point of the rectangle
(topmost, and if there are 2 topmost points, the left one)
* \param width : size of the right hand side of rect, from (topx,topy) roundwalking clockwise
* \param height : size of the left hand side of rect, from (topx,topy) roundwalking clockwise
* \param angle : angle of the right hand side of rect, from (topx,topy)
* \param iDst : pointer to destination image (if 0, this image is modified)
* \author [VATI]
*/
bool CxImage::CropRotatedRectangle( int32_t topx, int32_t topy, int32_t width, int32_t height, float angle, CxImage* iDst)
{
if (!pDib) return false;
int32_t startx,starty,endx,endy;
double cos_angle = cos(angle/*/57.295779513082320877*/);
double sin_angle = sin(angle/*/57.295779513082320877*/);
// if there is nothing special, call the original Crop():
if ( fabs(angle)<0.0002 )
return Crop( topx, topy, topx+width, topy+height, iDst);
startx = min(topx, topx - (int32_t)(sin_angle*(double)height));
endx = topx + (int32_t)(cos_angle*(double)width);
endy = topy + (int32_t)(cos_angle*(double)height + sin_angle*(double)width);
// check: corners of the rectangle must be inside
if ( IsInside( startx, topy )==false ||
IsInside( endx, endy ) == false )
return false;
// first crop to bounding rectangle
CxImage tmp(*this, true, false, true);
// tmp.Copy(*this, true, false, true);
if (!tmp.IsValid()){
strcpy(info.szLastError,tmp.GetLastError());
return false;
}
if (!tmp.Crop( startx, topy, endx, endy)){
strcpy(info.szLastError,tmp.GetLastError());
return false;
}
// the midpoint of the image now became the same as the midpoint of the rectangle
// rotate new image with minus angle amount
if ( false == tmp.Rotate( (float)(-angle*57.295779513082320877) ) ) // Rotate expects angle in degrees
return false;
// crop rotated image to the original selection rectangle
endx = (tmp.head.biWidth+width)/2;
startx = (tmp.head.biWidth-width)/2;
starty = (tmp.head.biHeight+height)/2;
endy = (tmp.head.biHeight-height)/2;
if ( false == tmp.Crop( startx, starty, endx, endy ) )
return false;
if (iDst) iDst->Transfer(tmp);
else Transfer(tmp);
return true;
}
////////////////////////////////////////////////////////////////////////////////
bool CxImage::Crop(const RECT& rect, CxImage* iDst)
{
return Crop(rect.left, rect.top, rect.right, rect.bottom, iDst);
}
////////////////////////////////////////////////////////////////////////////////
bool CxImage::Crop(int32_t left, int32_t top, int32_t right, int32_t bottom, CxImage* iDst)
{
if (!pDib) return false;
int32_t startx = max(0L,min(left,head.biWidth));
int32_t endx = max(0L,min(right,head.biWidth));
int32_t starty = head.biHeight - max(0L,min(top,head.biHeight));
int32_t endy = head.biHeight - max(0L,min(bottom,head.biHeight));
if (startx==endx || starty==endy) return false;
if (startx>endx) {int32_t tmp=startx; startx=endx; endx=tmp;}
if (starty>endy) {int32_t tmp=starty; starty=endy; endy=tmp;}
CxImage tmp;
tmp.CopyInfo(*this);
tmp.Create(endx-startx,endy-starty,head.biBitCount,info.dwType);
if (!tmp.IsValid()){
strcpy(info.szLastError,tmp.GetLastError());
return false;
}
tmp.SetPalette(GetPalette(),head.biClrUsed);
tmp.info.nBkgndIndex = info.nBkgndIndex;
tmp.info.nBkgndColor = info.nBkgndColor;
switch (head.biBitCount) {
case 1:
case 4:
{
for(int32_t y=starty, yd=0; y<endy; y++, yd++){
info.nProgress = (int32_t)(100*(y-starty)/(endy-starty)); //<Anatoly Ivasyuk>
for(int32_t x=startx, xd=0; x<endx; x++, xd++){
tmp.SetPixelIndex(xd,yd,GetPixelIndex(x,y));
}
}
break;
}
case 8:
case 24:
{
int32_t linelen = tmp.head.biWidth * tmp.head.biBitCount >> 3;
uint8_t* pDest = tmp.info.pImage;
uint8_t* pSrc = info.pImage + starty * info.dwEffWidth + (startx*head.biBitCount >> 3);
for(int32_t y=starty; y<endy; y++){
info.nProgress = (int32_t)(100*(y-starty)/(endy-starty)); //<Anatoly Ivasyuk>
memcpy(pDest,pSrc,linelen);
pDest+=tmp.info.dwEffWidth;
pSrc+=info.dwEffWidth;
}
}
}
#if CXIMAGE_SUPPORT_ALPHA
if (AlphaIsValid()){ //<oboolo>
tmp.AlphaCreate();
if (!tmp.AlphaIsValid()) return false;
uint8_t* pDest = tmp.pAlpha;
uint8_t* pSrc = pAlpha + startx + starty*head.biWidth;
for (int32_t y=starty; y<endy; y++){
memcpy(pDest,pSrc,endx-startx);
pDest+=tmp.head.biWidth;
pSrc+=head.biWidth;
}
}
#endif //CXIMAGE_SUPPORT_ALPHA
//select the destination
if (iDst) iDst->Transfer(tmp);
else Transfer(tmp);
return true;
}
////////////////////////////////////////////////////////////////////////////////
/**
* \param xgain, ygain : can be from 0 to 1.
* \param xpivot, ypivot : is the center of the transformation.
* \param bEnableInterpolation : if true, enables bilinear interpolation.
* \return true if everything is ok
*/
bool CxImage::Skew(float xgain, float ygain, int32_t xpivot, int32_t ypivot, bool bEnableInterpolation)
{
if (!pDib) return false;
float nx,ny;
CxImage tmp(*this);
if (!tmp.IsValid()){
strcpy(info.szLastError,tmp.GetLastError());
return false;
}
int32_t xmin,xmax,ymin,ymax;
if (pSelection){
xmin = info.rSelectionBox.left; xmax = info.rSelectionBox.right;
ymin = info.rSelectionBox.bottom; ymax = info.rSelectionBox.top;
} else {
xmin = ymin = 0;
xmax = head.biWidth; ymax=head.biHeight;
}
for(int32_t y=ymin; y<ymax; y++){
info.nProgress = (int32_t)(100*(y-ymin)/(ymax-ymin));
if (info.nEscape) break;
for(int32_t x=xmin; x<xmax; x++){
#if CXIMAGE_SUPPORT_SELECTION
if (BlindSelectionIsInside(x,y))
#endif //CXIMAGE_SUPPORT_SELECTION
{
nx = x + (xgain*(y - ypivot));
ny = y + (ygain*(x - xpivot));
#if CXIMAGE_SUPPORT_INTERPOLATION
if (bEnableInterpolation){
tmp.SetPixelColor(x,y,GetPixelColorInterpolated(nx, ny, CxImage::IM_BILINEAR, CxImage::OM_BACKGROUND),true);
} else
#endif //CXIMAGE_SUPPORT_INTERPOLATION
{
if (head.biClrUsed==0){
tmp.SetPixelColor(x,y,GetPixelColor((int32_t)nx,(int32_t)ny));
} else {
tmp.SetPixelIndex(x,y,GetPixelIndex((int32_t)nx,(int32_t)ny));
}
#if CXIMAGE_SUPPORT_ALPHA
tmp.AlphaSet(x,y,AlphaGet((int32_t)nx,(int32_t)ny));
#endif //CXIMAGE_SUPPORT_ALPHA
}
}
}
}
Transfer(tmp);
return true;
}
////////////////////////////////////////////////////////////////////////////////
/**
* Expands the borders.
* \param left, top, right, bottom = additional dimensions, should be greater than 0.
* \param canvascolor = border color. canvascolor.rgbReserved will set the alpha channel (if any) in the border.
* \param iDst = pointer to destination image (if it's 0, this image is modified)
* \return true if everything is ok
* \author [Colin Urquhart]; changes [DP]
*/
bool CxImage::Expand(int32_t left, int32_t top, int32_t right, int32_t bottom, RGBQUAD canvascolor, CxImage* iDst)
{
if (!pDib) return false;
if ((left < 0) || (right < 0) || (bottom < 0) || (top < 0)) return false;
int32_t newWidth = head.biWidth + left + right;
int32_t newHeight = head.biHeight + top + bottom;
right = left + head.biWidth - 1;
top = bottom + head.biHeight - 1;
CxImage tmp;
tmp.CopyInfo(*this);
if (!tmp.Create(newWidth, newHeight, head.biBitCount, info.dwType)){
strcpy(info.szLastError,tmp.GetLastError());
return false;
}
tmp.SetPalette(GetPalette(),head.biClrUsed);
switch (head.biBitCount) {
case 1:
case 4:
{
uint8_t pixel = tmp.GetNearestIndex(canvascolor);
for(int32_t y=0; y < newHeight; y++){
info.nProgress = (int32_t)(100*y/newHeight);
for(int32_t x=0; x < newWidth; x++){
if ((y < bottom) || (y > top) || (x < left) || (x > right)) {
tmp.SetPixelIndex(x,y, pixel);
} else {
tmp.SetPixelIndex(x,y,GetPixelIndex(x-left,y-bottom));
}
}
}
break;
}
case 8:
case 24:
{
if (head.biBitCount == 8) {
uint8_t pixel = tmp.GetNearestIndex( canvascolor);
memset(tmp.info.pImage, pixel, + (tmp.info.dwEffWidth * newHeight));
} else {
for (int32_t y = 0; y < newHeight; ++y) {
uint8_t *pDest = tmp.info.pImage + (y * tmp.info.dwEffWidth);
for (int32_t x = 0; x < newWidth; ++x) {
*pDest++ = canvascolor.rgbBlue;
*pDest++ = canvascolor.rgbGreen;
*pDest++ = canvascolor.rgbRed;
}
}
}
uint8_t* pDest = tmp.info.pImage + (tmp.info.dwEffWidth * bottom) + (left*(head.biBitCount >> 3));
uint8_t* pSrc = info.pImage;
for(int32_t y=bottom; y <= top; y++){
info.nProgress = (int32_t)(100*y/(1 + top - bottom));
memcpy(pDest,pSrc,(head.biBitCount >> 3) * (right - left + 1));
pDest+=tmp.info.dwEffWidth;
pSrc+=info.dwEffWidth;
}
}
}
#if CXIMAGE_SUPPORT_SELECTION
if (SelectionIsValid()){
if (!tmp.SelectionCreate())
return false;
uint8_t* pSrc = SelectionGetPointer();
uint8_t* pDst = tmp.SelectionGetPointer(left,bottom);
for(int32_t y=bottom; y <= top; y++){
memcpy(pDst,pSrc, (right - left + 1));
pSrc+=head.biWidth;
pDst+=tmp.head.biWidth;
}
tmp.info.rSelectionBox.left = info.rSelectionBox.left + left;
tmp.info.rSelectionBox.right = info.rSelectionBox.right + left;
tmp.info.rSelectionBox.top = info.rSelectionBox.top + bottom;
tmp.info.rSelectionBox.bottom = info.rSelectionBox.bottom + bottom;
}
#endif //CXIMAGE_SUPPORT_SELECTION
#if CXIMAGE_SUPPORT_ALPHA
if (AlphaIsValid()){
if (!tmp.AlphaCreate())
return false;
tmp.AlphaSet(canvascolor.rgbReserved);
uint8_t* pSrc = AlphaGetPointer();
uint8_t* pDst = tmp.AlphaGetPointer(left,bottom);
for(int32_t y=bottom; y <= top; y++){
memcpy(pDst,pSrc, (right - left + 1));
pSrc+=head.biWidth;
pDst+=tmp.head.biWidth;
}
}
#endif //CXIMAGE_SUPPORT_ALPHA
//select the destination
if (iDst) iDst->Transfer(tmp);
else Transfer(tmp);
return true;
}
////////////////////////////////////////////////////////////////////////////////
bool CxImage::Expand(int32_t newx, int32_t newy, RGBQUAD canvascolor, CxImage* iDst)
{
//thanks to <Colin Urquhart>
if (!pDib) return false;
if ((newx < head.biWidth) || (newy < head.biHeight)) return false;
int32_t nAddLeft = (newx - head.biWidth) / 2;
int32_t nAddTop = (newy - head.biHeight) / 2;
return Expand(nAddLeft, nAddTop, newx - (head.biWidth + nAddLeft), newy - (head.biHeight + nAddTop), canvascolor, iDst);
}
////////////////////////////////////////////////////////////////////////////////
/**
* Resamples the image with the correct aspect ratio, and fills the borders.
* \param newx, newy = thumbnail size.
* \param canvascolor = border color.
* \param iDst = pointer to destination image (if it's 0, this image is modified).
* \return true if everything is ok.
* \author [Colin Urquhart]
*/
bool CxImage::Thumbnail(int32_t newx, int32_t newy, RGBQUAD canvascolor, CxImage* iDst)
{
if (!pDib) return false;
if ((newx <= 0) || (newy <= 0)) return false;
CxImage tmp(*this);
if (!tmp.IsValid()){
strcpy(info.szLastError,tmp.GetLastError());
return false;
}
// determine whether we need to shrink the image
if ((head.biWidth > newx) || (head.biHeight > newy)) {
float fScale;
float fAspect = (float) newx / (float) newy;
if (fAspect * head.biHeight > head.biWidth) {
fScale = (float) newy / head.biHeight;
} else {
fScale = (float) newx / head.biWidth;
}
tmp.Resample((int32_t) (fScale * head.biWidth), (int32_t) (fScale * head.biHeight), 0);
}
// expand the frame
tmp.Expand(newx, newy, canvascolor);
//select the destination
if (iDst) iDst->Transfer(tmp);
else Transfer(tmp);
return true;
}
////////////////////////////////////////////////////////////////////////////////
/**
* Perform circle_based transformations.
* \param type - for different transformations
* - 0 for normal (proturberant) FishEye
* - 1 for reverse (concave) FishEye
* - 2 for Swirle
* - 3 for Cilinder mirror
* - 4 for bathroom
*
* \param rmax - effect radius. If 0, the whole image is processed
* \param Koeff - only for swirle
* \author Arkadiy Olovyannikov ark(at)msun(dot)ru
*/
bool CxImage::CircleTransform(int32_t type,int32_t rmax,float Koeff)
{
if (!pDib) return false;
int32_t nx,ny;
double angle,radius,rnew;
CxImage tmp(*this);
if (!tmp.IsValid()){
strcpy(info.szLastError,tmp.GetLastError());
return false;
}
int32_t xmin,xmax,ymin,ymax,xmid,ymid;
if (pSelection){
xmin = info.rSelectionBox.left; xmax = info.rSelectionBox.right;
ymin = info.rSelectionBox.bottom; ymax = info.rSelectionBox.top;
} else {
xmin = ymin = 0;
xmax = head.biWidth; ymax=head.biHeight;
}
xmid = (int32_t) (tmp.GetWidth()/2);
ymid = (int32_t) (tmp.GetHeight()/2);
if (!rmax) rmax=(int32_t)sqrt((float)((xmid-xmin)*(xmid-xmin)+(ymid-ymin)*(ymid-ymin)));
if (Koeff==0.0f) Koeff=1.0f;
for(int32_t y=ymin; y<ymax; y++){
info.nProgress = (int32_t)(100*(y-ymin)/(ymax-ymin));
if (info.nEscape) break;
for(int32_t x=xmin; x<xmax; x++){
#if CXIMAGE_SUPPORT_SELECTION
if (BlindSelectionIsInside(x,y))
#endif //CXIMAGE_SUPPORT_SELECTION
{
nx=xmid-x;
ny=ymid-y;
radius=sqrt((float)(nx*nx+ny*ny));
if (radius<rmax) {
angle=atan2((double)ny,(double)nx);
if (type==0) rnew=radius*radius/rmax;
else if (type==1) rnew=sqrt(radius*rmax);
else if (type==2) {rnew=radius;angle += radius / Koeff;}
else rnew = 1; // potentially uninitialized
if (type<3){
nx = xmid + (int32_t)(rnew * cos(angle));
ny = ymid - (int32_t)(rnew * sin(angle));
}
else if (type==3){
nx = (int32_t)fabs((angle*xmax/6.2831852));
ny = (int32_t)fabs((radius*ymax/rmax));
}
else {
nx=x+(x%32)-16;
ny=y;
}
// nx=max(xmin,min(nx,xmax));
// ny=max(ymin,min(ny,ymax));
}
else { nx=-1;ny=-1;}
if (head.biClrUsed==0){
tmp.SetPixelColor(x,y,GetPixelColor(nx,ny));
} else {
tmp.SetPixelIndex(x,y,GetPixelIndex(nx,ny));
}
#if CXIMAGE_SUPPORT_ALPHA
tmp.AlphaSet(x,y,AlphaGet(nx,ny));
#endif //CXIMAGE_SUPPORT_ALPHA
}
}
}
Transfer(tmp);
return true;
}
////////////////////////////////////////////////////////////////////////////////
/**
* Faster way to almost properly shrink image. Algorithm produces results comparable with "high resoultion shrink"
* when resulting image is much smaller (that would be 3 times or more) than original. When
* resulting image is only slightly smaller, results are closer to nearest pixel.
* This algorithm works by averaging, but it does not calculate fractions of pixels. It adds whole
* source pixels to the best destionation. It is not geometrically "correct".
* It's main advantage over "high" resulution shrink is speed, so it's useful, when speed is most
* important (preview thumbnails, "map" view, ...).
* Method is optimized for RGB24 images.
*
* \param newx, newy - size of destination image (must be smaller than original!)
* \param iDst - pointer to destination image (if it's 0, this image is modified)
* \param bChangeBpp - flag points to change result image bpp (if it's true, this result image bpp = 24 (useful for B/W image thumbnails))
*
* \return true if everything is ok
* \author [bd], 9.2004; changes [Artiom Mirolubov], 1.2005
*/
bool CxImage::QIShrink(int32_t newx, int32_t newy, CxImage* const iDst, bool bChangeBpp)
{
if (!pDib) return false;
if (newx>head.biWidth || newy>head.biHeight) {
//let me repeat... this method can't enlarge image
strcpy(info.szLastError,"QIShrink can't enlarge image");
return false;
}
if (newx==head.biWidth && newy==head.biHeight) {
//image already correct size (just copy and return)
if (iDst) iDst->Copy(*this);
return true;
}//if
//create temporary destination image
CxImage newImage;
newImage.CopyInfo(*this);
newImage.Create(newx,newy,(bChangeBpp)?24:head.biBitCount,GetType());
newImage.SetPalette(GetPalette());
if (!newImage.IsValid()){
strcpy(info.szLastError,newImage.GetLastError());
return false;
}
//and alpha channel if required
#if CXIMAGE_SUPPORT_ALPHA
if (AlphaIsValid()) newImage.AlphaCreate();
#endif
const int32_t oldx = head.biWidth;
const int32_t oldy = head.biHeight;
int32_t accuCellSize = 4;
#if CXIMAGE_SUPPORT_ALPHA
uint8_t *alphaPtr;
if (AlphaIsValid()) accuCellSize=5;
#endif
uint32_t *accu = new uint32_t[newx*accuCellSize]; //array for suming pixels... one pixel for every destination column
uint32_t *accuPtr; //pointer for walking through accu
//each cell consists of blue, red, green component and count of pixels summed in this cell
memset(accu, 0, newx * accuCellSize * sizeof(uint32_t)); //clear accu
if (!IsIndexed()) {
//RGB24 version with pointers
uint8_t *destPtr, *srcPtr, *destPtrS, *srcPtrS; //destination and source pixel, and beginnings of current row
srcPtrS=(uint8_t*)BlindGetPixelPointer(0,0);
destPtrS=(uint8_t*)newImage.BlindGetPixelPointer(0,0);
int32_t ex=0, ey=0; //ex and ey replace division...
int32_t dy=0;
//(we just add pixels, until by adding newx or newy we get a number greater than old size... then
// it's time to move to next pixel)
for(int32_t y=0; y<oldy; y++){ //for all source rows
info.nProgress = (int32_t)(100*y/oldy); if (info.nEscape) break;
ey += newy;
ex = 0; //restart with ex = 0
accuPtr=accu; //restart from beginning of accu
srcPtr=srcPtrS; //and from new source line
#if CXIMAGE_SUPPORT_ALPHA
alphaPtr = AlphaGetPointer(0, y);
#endif
for(int32_t x=0; x<oldx; x++){ //for all source columns
ex += newx;
*accuPtr += *(srcPtr++); //add current pixel to current accu slot
*(accuPtr+1) += *(srcPtr++);
*(accuPtr+2) += *(srcPtr++);
(*(accuPtr+3)) ++;
#if CXIMAGE_SUPPORT_ALPHA
if (alphaPtr) *(accuPtr+4) += *(alphaPtr++);
#endif
if (ex>oldx) { //when we reach oldx, it's time to move to new slot
accuPtr += accuCellSize;
ex -= oldx; //(substract oldx from ex and resume from there on)
}//if (ex overflow)
}//for x
if (ey>=oldy) { //now when this happens
ey -= oldy; //it's time to move to new destination row
destPtr = destPtrS; //reset pointers to proper initial values
accuPtr = accu;
#if CXIMAGE_SUPPORT_ALPHA
alphaPtr = newImage.AlphaGetPointer(0, dy++);
#endif
for (int32_t k=0; k<newx; k++) { //copy accu to destination row (divided by number of pixels in each slot)
*(destPtr++) = (uint8_t)(*(accuPtr) / *(accuPtr+3));
*(destPtr++) = (uint8_t)(*(accuPtr+1) / *(accuPtr+3));
*(destPtr++) = (uint8_t)(*(accuPtr+2) / *(accuPtr+3));
#if CXIMAGE_SUPPORT_ALPHA
if (alphaPtr) *(alphaPtr++) = (uint8_t)(*(accuPtr+4) / *(accuPtr+3));
#endif
accuPtr += accuCellSize;
}//for k
memset(accu, 0, newx * accuCellSize * sizeof(uint32_t)); //clear accu
destPtrS += newImage.info.dwEffWidth;
}//if (ey overflow)
srcPtrS += info.dwEffWidth; //next round we start from new source row
}//for y
} else {
//standard version with GetPixelColor...
int32_t ex=0, ey=0; //ex and ey replace division...
int32_t dy=0;
//(we just add pixels, until by adding newx or newy we get a number greater than old size... then
// it's time to move to next pixel)
RGBQUAD rgb;
for(int32_t y=0; y<oldy; y++){ //for all source rows
info.nProgress = (int32_t)(100*y/oldy); if (info.nEscape) break;
ey += newy;
ex = 0; //restart with ex = 0
accuPtr=accu; //restart from beginning of accu
for(int32_t x=0; x<oldx; x++){ //for all source columns
ex += newx;
rgb = GetPixelColor(x, y, true);
*accuPtr += rgb.rgbBlue; //add current pixel to current accu slot
*(accuPtr+1) += rgb.rgbRed;
*(accuPtr+2) += rgb.rgbGreen;
(*(accuPtr+3)) ++;
#if CXIMAGE_SUPPORT_ALPHA
if (pAlpha) *(accuPtr+4) += rgb.rgbReserved;
#endif
if (ex>oldx) { //when we reach oldx, it's time to move to new slot
accuPtr += accuCellSize;
ex -= oldx; //(substract oldx from ex and resume from there on)
}//if (ex overflow)
}//for x
if (ey>=oldy) { //now when this happens
ey -= oldy; //it's time to move to new destination row
accuPtr = accu;
for (int32_t dx=0; dx<newx; dx++) { //copy accu to destination row (divided by number of pixels in each slot)
rgb.rgbBlue = (uint8_t)(*(accuPtr) / *(accuPtr+3));
rgb.rgbRed = (uint8_t)(*(accuPtr+1) / *(accuPtr+3));
rgb.rgbGreen= (uint8_t)(*(accuPtr+2) / *(accuPtr+3));
#if CXIMAGE_SUPPORT_ALPHA
if (pAlpha) rgb.rgbReserved = (uint8_t)(*(accuPtr+4) / *(accuPtr+3));
#endif
newImage.SetPixelColor(dx, dy, rgb, pAlpha!=0);
accuPtr += accuCellSize;
}//for dx
memset(accu, 0, newx * accuCellSize * sizeof(uint32_t)); //clear accu
dy++;
}//if (ey overflow)
}//for y
}//if
delete [] accu; //delete helper array
//copy new image to the destination
if (iDst)
iDst->Transfer(newImage);
else
Transfer(newImage);
return true;
}
////////////////////////////////////////////////////////////////////////////////
#endif //CXIMAGE_SUPPORT_TRANSFORMATION
