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ximatran.cpp
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ximatran.cpp
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// xImaTran.cpp : Transformation functions
/* 07/08/2001 v1.00 - Davide Pizzolato - www.xdp.it
* CxImage version 7.0.1 07/Jan/2011
*/
#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