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dis-bench / src /php /php-src /ext /gd /libgd /gd_rotate.c
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#include "gd.h"
#include "gd_intern.h"
#include <math.h>
/*
* Rotate function Added on 2003/12
* by Pierre-Alain Joye (pierre@php.net)
**/
/* Begin rotate function */
#ifdef ROTATE_PI
#undef ROTATE_PI
#endif /* ROTATE_PI */
#define ROTATE_DEG2RAD 3.1415926535897932384626433832795/180
void gdImageSkewX (gdImagePtr dst, gdImagePtr src, int uRow, int iOffset, double dWeight, int clrBack, int ignoretransparent)
{
typedef int (*FuncPtr)(gdImagePtr, int, int);
int i, r, g, b, a, clrBackR, clrBackG, clrBackB, clrBackA;
FuncPtr f;
int pxlOldLeft, pxlLeft=0, pxlSrc;
/* Keep clrBack as color index if required */
if (src->trueColor) {
pxlOldLeft = clrBack;
f = gdImageGetTrueColorPixel;
} else {
pxlOldLeft = clrBack;
clrBackR = gdImageRed(src, clrBack);
clrBackG = gdImageGreen(src, clrBack);
clrBackB = gdImageBlue(src, clrBack);
clrBackA = gdImageAlpha(src, clrBack);
clrBack = gdTrueColorAlpha(clrBackR, clrBackG, clrBackB, clrBackA);
f = gdImageGetPixel;
}
for (i = 0; i < iOffset; i++) {
gdImageSetPixel (dst, i, uRow, clrBack);
}
if (i < dst->sx) {
gdImageSetPixel (dst, i, uRow, clrBack);
}
for (i = 0; i < src->sx; i++) {
pxlSrc = f (src,i,uRow);
r = (int)(gdImageRed(src,pxlSrc) * dWeight);
g = (int)(gdImageGreen(src,pxlSrc) * dWeight);
b = (int)(gdImageBlue(src,pxlSrc) * dWeight);
a = (int)(gdImageAlpha(src,pxlSrc) * dWeight);
pxlLeft = gdImageColorAllocateAlpha(src, r, g, b, a);
if (pxlLeft == -1) {
pxlLeft = gdImageColorClosestAlpha(src, r, g, b, a);
}
r = gdImageRed(src,pxlSrc) - (gdImageRed(src,pxlLeft) - gdImageRed(src,pxlOldLeft));
g = gdImageGreen(src,pxlSrc) - (gdImageGreen(src,pxlLeft) - gdImageGreen(src,pxlOldLeft));
b = gdImageBlue(src,pxlSrc) - (gdImageBlue(src,pxlLeft) - gdImageBlue(src,pxlOldLeft));
a = gdImageAlpha(src,pxlSrc) - (gdImageAlpha(src,pxlLeft) - gdImageAlpha(src,pxlOldLeft));
if (r>255) {
r = 255;
}
if (g>255) {
g = 255;
}
if (b>255) {
b = 255;
}
if (a>127) {
a = 127;
}
if (ignoretransparent && pxlSrc == dst->transparent) {
pxlSrc = dst->transparent;
} else {
pxlSrc = gdImageColorAllocateAlpha(dst, r, g, b, a);
if (pxlSrc == -1) {
pxlSrc = gdImageColorClosestAlpha(dst, r, g, b, a);
}
}
if ((i + iOffset >= 0) && (i + iOffset < dst->sx)) {
gdImageSetPixel (dst, i+iOffset, uRow, pxlSrc);
}
pxlOldLeft = pxlLeft;
}
i += iOffset;
if (i < dst->sx) {
gdImageSetPixel (dst, i, uRow, pxlLeft);
}
gdImageSetPixel (dst, iOffset, uRow, clrBack);
i--;
while (++i < dst->sx) {
gdImageSetPixel (dst, i, uRow, clrBack);
}
}
void gdImageSkewY (gdImagePtr dst, gdImagePtr src, int uCol, int iOffset, double dWeight, int clrBack, int ignoretransparent)
{
typedef int (*FuncPtr)(gdImagePtr, int, int);
int i, iYPos=0, r, g, b, a;
FuncPtr f;
int pxlOldLeft, pxlLeft=0, pxlSrc;
if (src->trueColor) {
f = gdImageGetTrueColorPixel;
} else {
f = gdImageGetPixel;
}
for (i = 0; i<=iOffset; i++) {
gdImageSetPixel (dst, uCol, i, clrBack);
}
r = (int)((double)gdImageRed(src,clrBack) * dWeight);
g = (int)((double)gdImageGreen(src,clrBack) * dWeight);
b = (int)((double)gdImageBlue(src,clrBack) * dWeight);
a = (int)((double)gdImageAlpha(src,clrBack) * dWeight);
pxlOldLeft = gdImageColorAllocateAlpha(dst, r, g, b, a);
for (i = 0; i < src->sy; i++) {
pxlSrc = f (src, uCol, i);
iYPos = i + iOffset;
r = (int)((double)gdImageRed(src,pxlSrc) * dWeight);
g = (int)((double)gdImageGreen(src,pxlSrc) * dWeight);
b = (int)((double)gdImageBlue(src,pxlSrc) * dWeight);
a = (int)((double)gdImageAlpha(src,pxlSrc) * dWeight);
pxlLeft = gdImageColorAllocateAlpha(src, r, g, b, a);
if (pxlLeft == -1) {
pxlLeft = gdImageColorClosestAlpha(src, r, g, b, a);
}
r = gdImageRed(src,pxlSrc) - (gdImageRed(src,pxlLeft) - gdImageRed(src,pxlOldLeft));
g = gdImageGreen(src,pxlSrc) - (gdImageGreen(src,pxlLeft) - gdImageGreen(src,pxlOldLeft));
b = gdImageBlue(src,pxlSrc) - (gdImageBlue(src,pxlLeft) - gdImageBlue(src,pxlOldLeft));
a = gdImageAlpha(src,pxlSrc) - (gdImageAlpha(src,pxlLeft) - gdImageAlpha(src,pxlOldLeft));
if (r>255) {
r = 255;
}
if (g>255) {
g = 255;
}
if (b>255) {
b = 255;
}
if (a>127) {
a = 127;
}
if (ignoretransparent && pxlSrc == dst->transparent) {
pxlSrc = dst->transparent;
} else {
pxlSrc = gdImageColorAllocateAlpha(dst, r, g, b, a);
if (pxlSrc == -1) {
pxlSrc = gdImageColorClosestAlpha(dst, r, g, b, a);
}
}
if ((iYPos >= 0) && (iYPos < dst->sy)) {
gdImageSetPixel (dst, uCol, iYPos, pxlSrc);
}
pxlOldLeft = pxlLeft;
}
i = iYPos;
if (i < dst->sy) {
gdImageSetPixel (dst, uCol, i, pxlLeft);
}
i--;
while (++i < dst->sy) {
gdImageSetPixel (dst, uCol, i, clrBack);
}
}
/* Rotates an image by 90 degrees (counter clockwise) */
gdImagePtr gdImageRotate90 (gdImagePtr src, int ignoretransparent)
{
int uY, uX;
int c,r,g,b,a;
gdImagePtr dst;
typedef int (*FuncPtr)(gdImagePtr, int, int);
FuncPtr f;
if (src->trueColor) {
f = gdImageGetTrueColorPixel;
} else {
f = gdImageGetPixel;
}
dst = gdImageCreateTrueColor(src->sy, src->sx);
if (dst != NULL) {
int old_blendmode = dst->alphaBlendingFlag;
dst->alphaBlendingFlag = 0;
dst->saveAlphaFlag = 1;
dst->transparent = src->transparent;
gdImagePaletteCopy (dst, src);
for (uY = 0; uY<src->sy; uY++) {
for (uX = 0; uX<src->sx; uX++) {
c = f (src, uX, uY);
if (!src->trueColor) {
r = gdImageRed(src,c);
g = gdImageGreen(src,c);
b = gdImageBlue(src,c);
a = gdImageAlpha(src,c);
c = gdTrueColorAlpha(r, g, b, a);
}
if (ignoretransparent && c == dst->transparent) {
gdImageSetPixel(dst, uY, (dst->sy - uX - 1), dst->transparent);
} else {
gdImageSetPixel(dst, uY, (dst->sy - uX - 1), c);
}
}
}
dst->alphaBlendingFlag = old_blendmode;
}
return dst;
}
/* Rotates an image by 180 degrees (counter clockwise) */
gdImagePtr gdImageRotate180 (gdImagePtr src, int ignoretransparent)
{
int uY, uX;
int c,r,g,b,a;
gdImagePtr dst;
typedef int (*FuncPtr)(gdImagePtr, int, int);
FuncPtr f;
if (src->trueColor) {
f = gdImageGetTrueColorPixel;
} else {
f = gdImageGetPixel;
}
dst = gdImageCreateTrueColor(src->sx, src->sy);
if (dst != NULL) {
int old_blendmode = dst->alphaBlendingFlag;
dst->alphaBlendingFlag = 0;
dst->saveAlphaFlag = 1;
dst->transparent = src->transparent;
gdImagePaletteCopy (dst, src);
for (uY = 0; uY<src->sy; uY++) {
for (uX = 0; uX<src->sx; uX++) {
c = f (src, uX, uY);
if (!src->trueColor) {
r = gdImageRed(src,c);
g = gdImageGreen(src,c);
b = gdImageBlue(src,c);
a = gdImageAlpha(src,c);
c = gdTrueColorAlpha(r, g, b, a);
}
if (ignoretransparent && c == dst->transparent) {
gdImageSetPixel(dst, (dst->sx - uX - 1), (dst->sy - uY - 1), dst->transparent);
} else {
gdImageSetPixel(dst, (dst->sx - uX - 1), (dst->sy - uY - 1), c);
}
}
}
dst->alphaBlendingFlag = old_blendmode;
}
return dst;
}
/* Rotates an image by 270 degrees (counter clockwise) */
gdImagePtr gdImageRotate270 (gdImagePtr src, int ignoretransparent)
{
int uY, uX;
int c,r,g,b,a;
gdImagePtr dst;
typedef int (*FuncPtr)(gdImagePtr, int, int);
FuncPtr f;
if (src->trueColor) {
f = gdImageGetTrueColorPixel;
} else {
f = gdImageGetPixel;
}
dst = gdImageCreateTrueColor (src->sy, src->sx);
if (dst != NULL) {
int old_blendmode = dst->alphaBlendingFlag;
dst->alphaBlendingFlag = 0;
dst->saveAlphaFlag = 1;
dst->transparent = src->transparent;
gdImagePaletteCopy (dst, src);
for (uY = 0; uY<src->sy; uY++) {
for (uX = 0; uX<src->sx; uX++) {
c = f (src, uX, uY);
if (!src->trueColor) {
r = gdImageRed(src,c);
g = gdImageGreen(src,c);
b = gdImageBlue(src,c);
a = gdImageAlpha(src,c);
c = gdTrueColorAlpha(r, g, b, a);
}
if (ignoretransparent && c == dst->transparent) {
gdImageSetPixel(dst, (dst->sx - uY - 1), uX, dst->transparent);
} else {
gdImageSetPixel(dst, (dst->sx - uY - 1), uX, c);
}
}
}
dst->alphaBlendingFlag = old_blendmode;
}
return dst;
}