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558 lines
13 KiB
C
558 lines
13 KiB
C
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#if HAVE_GD_BUNDLED
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# include "gd.h"
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#else
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# include <gd.h>
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#endif
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#include "gd_intern.h"
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#include <math.h>
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/*
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* Rotate function Added on 2003/12
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* by Pierre-Alain Joye (pierre@php.net)
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**/
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/* Begin rotate function */
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#ifdef ROTATE_PI
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#undef ROTATE_PI
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#endif /* ROTATE_PI */
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#define ROTATE_DEG2RAD 3.1415926535897932384626433832795/180
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void gdImageSkewX (gdImagePtr dst, gdImagePtr src, int uRow, int iOffset, double dWeight, int clrBack, int ignoretransparent)
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{
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typedef int (*FuncPtr)(gdImagePtr, int, int);
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int i, r, g, b, a, clrBackR, clrBackG, clrBackB, clrBackA;
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FuncPtr f;
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int pxlOldLeft, pxlLeft=0, pxlSrc;
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/* Keep clrBack as color index if required */
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if (src->trueColor) {
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pxlOldLeft = clrBack;
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f = gdImageGetTrueColorPixel;
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} else {
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pxlOldLeft = clrBack;
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clrBackR = gdImageRed(src, clrBack);
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clrBackG = gdImageGreen(src, clrBack);
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clrBackB = gdImageBlue(src, clrBack);
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clrBackA = gdImageAlpha(src, clrBack);
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clrBack = gdTrueColorAlpha(clrBackR, clrBackG, clrBackB, clrBackA);
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f = gdImageGetPixel;
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}
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for (i = 0; i < iOffset; i++) {
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gdImageSetPixel (dst, i, uRow, clrBack);
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}
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if (i < dst->sx) {
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gdImageSetPixel (dst, i, uRow, clrBack);
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}
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for (i = 0; i < src->sx; i++) {
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pxlSrc = f (src,i,uRow);
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r = (int)(gdImageRed(src,pxlSrc) * dWeight);
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g = (int)(gdImageGreen(src,pxlSrc) * dWeight);
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b = (int)(gdImageBlue(src,pxlSrc) * dWeight);
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a = (int)(gdImageAlpha(src,pxlSrc) * dWeight);
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pxlLeft = gdImageColorAllocateAlpha(src, r, g, b, a);
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if (pxlLeft == -1) {
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pxlLeft = gdImageColorClosestAlpha(src, r, g, b, a);
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}
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r = gdImageRed(src,pxlSrc) - (gdImageRed(src,pxlLeft) - gdImageRed(src,pxlOldLeft));
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g = gdImageGreen(src,pxlSrc) - (gdImageGreen(src,pxlLeft) - gdImageGreen(src,pxlOldLeft));
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b = gdImageBlue(src,pxlSrc) - (gdImageBlue(src,pxlLeft) - gdImageBlue(src,pxlOldLeft));
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a = gdImageAlpha(src,pxlSrc) - (gdImageAlpha(src,pxlLeft) - gdImageAlpha(src,pxlOldLeft));
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if (r>255) {
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r = 255;
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}
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if (g>255) {
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g = 255;
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}
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if (b>255) {
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b = 255;
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}
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if (a>127) {
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a = 127;
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}
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if (ignoretransparent && pxlSrc == dst->transparent) {
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pxlSrc = dst->transparent;
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} else {
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pxlSrc = gdImageColorAllocateAlpha(dst, r, g, b, a);
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if (pxlSrc == -1) {
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pxlSrc = gdImageColorClosestAlpha(dst, r, g, b, a);
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}
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}
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if ((i + iOffset >= 0) && (i + iOffset < dst->sx)) {
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gdImageSetPixel (dst, i+iOffset, uRow, pxlSrc);
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}
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pxlOldLeft = pxlLeft;
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}
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i += iOffset;
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if (i < dst->sx) {
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gdImageSetPixel (dst, i, uRow, pxlLeft);
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}
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gdImageSetPixel (dst, iOffset, uRow, clrBack);
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i--;
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while (++i < dst->sx) {
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gdImageSetPixel (dst, i, uRow, clrBack);
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}
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}
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void gdImageSkewY (gdImagePtr dst, gdImagePtr src, int uCol, int iOffset, double dWeight, int clrBack, int ignoretransparent)
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{
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typedef int (*FuncPtr)(gdImagePtr, int, int);
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int i, iYPos=0, r, g, b, a;
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FuncPtr f;
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int pxlOldLeft, pxlLeft=0, pxlSrc;
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if (src->trueColor) {
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f = gdImageGetTrueColorPixel;
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} else {
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f = gdImageGetPixel;
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}
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for (i = 0; i<=iOffset; i++) {
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gdImageSetPixel (dst, uCol, i, clrBack);
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}
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r = (int)((double)gdImageRed(src,clrBack) * dWeight);
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g = (int)((double)gdImageGreen(src,clrBack) * dWeight);
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b = (int)((double)gdImageBlue(src,clrBack) * dWeight);
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a = (int)((double)gdImageAlpha(src,clrBack) * dWeight);
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pxlOldLeft = gdImageColorAllocateAlpha(dst, r, g, b, a);
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for (i = 0; i < src->sy; i++) {
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pxlSrc = f (src, uCol, i);
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iYPos = i + iOffset;
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r = (int)((double)gdImageRed(src,pxlSrc) * dWeight);
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g = (int)((double)gdImageGreen(src,pxlSrc) * dWeight);
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b = (int)((double)gdImageBlue(src,pxlSrc) * dWeight);
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a = (int)((double)gdImageAlpha(src,pxlSrc) * dWeight);
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pxlLeft = gdImageColorAllocateAlpha(src, r, g, b, a);
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if (pxlLeft == -1) {
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pxlLeft = gdImageColorClosestAlpha(src, r, g, b, a);
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}
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r = gdImageRed(src,pxlSrc) - (gdImageRed(src,pxlLeft) - gdImageRed(src,pxlOldLeft));
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g = gdImageGreen(src,pxlSrc) - (gdImageGreen(src,pxlLeft) - gdImageGreen(src,pxlOldLeft));
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b = gdImageBlue(src,pxlSrc) - (gdImageBlue(src,pxlLeft) - gdImageBlue(src,pxlOldLeft));
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a = gdImageAlpha(src,pxlSrc) - (gdImageAlpha(src,pxlLeft) - gdImageAlpha(src,pxlOldLeft));
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if (r>255) {
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r = 255;
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}
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if (g>255) {
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g = 255;
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}
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if (b>255) {
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b = 255;
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}
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if (a>127) {
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a = 127;
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}
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if (ignoretransparent && pxlSrc == dst->transparent) {
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pxlSrc = dst->transparent;
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} else {
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pxlSrc = gdImageColorAllocateAlpha(dst, r, g, b, a);
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if (pxlSrc == -1) {
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pxlSrc = gdImageColorClosestAlpha(dst, r, g, b, a);
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}
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}
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if ((iYPos >= 0) && (iYPos < dst->sy)) {
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gdImageSetPixel (dst, uCol, iYPos, pxlSrc);
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}
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pxlOldLeft = pxlLeft;
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}
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i = iYPos;
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if (i < dst->sy) {
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gdImageSetPixel (dst, uCol, i, pxlLeft);
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}
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i--;
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while (++i < dst->sy) {
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gdImageSetPixel (dst, uCol, i, clrBack);
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}
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}
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/* Rotates an image by 90 degrees (counter clockwise) */
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gdImagePtr gdImageRotate90 (gdImagePtr src, int ignoretransparent)
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{
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int uY, uX;
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int c,r,g,b,a;
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gdImagePtr dst;
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typedef int (*FuncPtr)(gdImagePtr, int, int);
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FuncPtr f;
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if (src->trueColor) {
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f = gdImageGetTrueColorPixel;
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} else {
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f = gdImageGetPixel;
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}
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dst = gdImageCreateTrueColor(src->sy, src->sx);
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dst->transparent = src->transparent;
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if (dst != NULL) {
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int old_blendmode = dst->alphaBlendingFlag;
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dst->alphaBlendingFlag = 0;
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gdImagePaletteCopy (dst, src);
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for (uY = 0; uY<src->sy; uY++) {
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for (uX = 0; uX<src->sx; uX++) {
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c = f (src, uX, uY);
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if (!src->trueColor) {
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r = gdImageRed(src,c);
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g = gdImageGreen(src,c);
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b = gdImageBlue(src,c);
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a = gdImageAlpha(src,c);
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c = gdTrueColorAlpha(r, g, b, a);
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}
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if (ignoretransparent && c == dst->transparent) {
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gdImageSetPixel(dst, uY, (dst->sy - uX - 1), dst->transparent);
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} else {
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gdImageSetPixel(dst, uY, (dst->sy - uX - 1), c);
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}
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}
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}
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dst->alphaBlendingFlag = old_blendmode;
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}
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return dst;
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}
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/* Rotates an image by 180 degrees (counter clockwise) */
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gdImagePtr gdImageRotate180 (gdImagePtr src, int ignoretransparent)
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{
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int uY, uX;
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int c,r,g,b,a;
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gdImagePtr dst;
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typedef int (*FuncPtr)(gdImagePtr, int, int);
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FuncPtr f;
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if (src->trueColor) {
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f = gdImageGetTrueColorPixel;
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} else {
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f = gdImageGetPixel;
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}
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dst = gdImageCreateTrueColor(src->sx, src->sy);
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dst->transparent = src->transparent;
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if (dst != NULL) {
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int old_blendmode = dst->alphaBlendingFlag;
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dst->alphaBlendingFlag = 0;
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gdImagePaletteCopy (dst, src);
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for (uY = 0; uY<src->sy; uY++) {
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for (uX = 0; uX<src->sx; uX++) {
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c = f (src, uX, uY);
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if (!src->trueColor) {
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r = gdImageRed(src,c);
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g = gdImageGreen(src,c);
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b = gdImageBlue(src,c);
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a = gdImageAlpha(src,c);
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c = gdTrueColorAlpha(r, g, b, a);
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}
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if (ignoretransparent && c == dst->transparent) {
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gdImageSetPixel(dst, (dst->sx - uX - 1), (dst->sy - uY - 1), dst->transparent);
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} else {
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gdImageSetPixel(dst, (dst->sx - uX - 1), (dst->sy - uY - 1), c);
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}
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}
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}
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dst->alphaBlendingFlag = old_blendmode;
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}
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return dst;
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}
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/* Rotates an image by 270 degrees (counter clockwise) */
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gdImagePtr gdImageRotate270 (gdImagePtr src, int ignoretransparent)
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{
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int uY, uX;
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int c,r,g,b,a;
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gdImagePtr dst;
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typedef int (*FuncPtr)(gdImagePtr, int, int);
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FuncPtr f;
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if (src->trueColor) {
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f = gdImageGetTrueColorPixel;
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} else {
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f = gdImageGetPixel;
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}
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dst = gdImageCreateTrueColor (src->sy, src->sx);
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dst->transparent = src->transparent;
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if (dst != NULL) {
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int old_blendmode = dst->alphaBlendingFlag;
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dst->alphaBlendingFlag = 0;
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gdImagePaletteCopy (dst, src);
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for (uY = 0; uY<src->sy; uY++) {
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for (uX = 0; uX<src->sx; uX++) {
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c = f (src, uX, uY);
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if (!src->trueColor) {
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r = gdImageRed(src,c);
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g = gdImageGreen(src,c);
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b = gdImageBlue(src,c);
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a = gdImageAlpha(src,c);
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c = gdTrueColorAlpha(r, g, b, a);
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}
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if (ignoretransparent && c == dst->transparent) {
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gdImageSetPixel(dst, (dst->sx - uY - 1), uX, dst->transparent);
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} else {
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gdImageSetPixel(dst, (dst->sx - uY - 1), uX, c);
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}
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}
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}
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dst->alphaBlendingFlag = old_blendmode;
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}
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return dst;
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}
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gdImagePtr gdImageRotate45 (gdImagePtr src, double dAngle, int clrBack, int ignoretransparent)
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{
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typedef int (*FuncPtr)(gdImagePtr, int, int);
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gdImagePtr dst1,dst2,dst3;
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FuncPtr f;
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double dRadAngle, dSinE, dTan, dShear;
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double dOffset; /* Variable skew offset */
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int u, iShear, newx, newy;
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int clrBackR, clrBackG, clrBackB, clrBackA;
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/* See GEMS I for the algorithm details */
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dRadAngle = dAngle * ROTATE_DEG2RAD; /* Angle in radians */
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dSinE = sin (dRadAngle);
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dTan = tan (dRadAngle / 2.0);
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newx = (int)(src->sx + src->sy * fabs(dTan));
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newy = src->sy;
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/* 1st shear */
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if (src->trueColor) {
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f = gdImageGetTrueColorPixel;
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} else {
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f = gdImageGetPixel;
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}
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dst1 = gdImageCreateTrueColor(newx, newy);
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/******* Perform 1st shear (horizontal) ******/
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if (dst1 == NULL) {
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return NULL;
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}
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#ifdef HAVE_GD_BUNDLED
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dst1->alphaBlendingFlag = gdEffectReplace;
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#else
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gdImageAlphaBlending(dst1, 0);
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#endif
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if (dAngle == 0.0) {
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/* Returns copy of src */
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gdImageCopy (dst1, src,0,0,0,0,src->sx,src->sy);
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return dst1;
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}
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gdImagePaletteCopy (dst1, src);
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if (ignoretransparent) {
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if (gdImageTrueColor(src)) {
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dst1->transparent = src->transparent;
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} else {
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dst1->transparent = gdTrueColorAlpha(gdImageRed(src, src->transparent), gdImageBlue(src, src->transparent), gdImageGreen(src, src->transparent), 127);
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}
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}
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dRadAngle = dAngle * ROTATE_DEG2RAD; /* Angle in radians */
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dSinE = sin (dRadAngle);
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dTan = tan (dRadAngle / 2.0);
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for (u = 0; u < dst1->sy; u++) {
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if (dTan >= 0.0) {
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dShear = ((double)(u + 0.5)) * dTan;
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} else {
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dShear = ((double)(u - dst1->sy) + 0.5) * dTan;
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}
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iShear = (int)floor(dShear);
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gdImageSkewX(dst1, src, u, iShear, (dShear - iShear), clrBack, ignoretransparent);
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}
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/*
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The 1st shear may use the original clrBack as color index
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Convert it once here
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*/
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if(!src->trueColor) {
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clrBackR = gdImageRed(src, clrBack);
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clrBackG = gdImageGreen(src, clrBack);
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||
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clrBackB = gdImageBlue(src, clrBack);
|
||
|
clrBackA = gdImageAlpha(src, clrBack);
|
||
|
clrBack = gdTrueColorAlpha(clrBackR, clrBackG, clrBackB, clrBackA);
|
||
|
}
|
||
|
/* 2nd shear */
|
||
|
newx = dst1->sx;
|
||
|
|
||
|
if (dSinE > 0.0) {
|
||
|
dOffset = (src->sx-1) * dSinE;
|
||
|
} else {
|
||
|
dOffset = -dSinE * (src->sx - newx);
|
||
|
}
|
||
|
|
||
|
newy = (int) ((double) src->sx * fabs( dSinE ) + (double) src->sy * cos (dRadAngle))+1;
|
||
|
|
||
|
if (src->trueColor) {
|
||
|
f = gdImageGetTrueColorPixel;
|
||
|
} else {
|
||
|
f = gdImageGetPixel;
|
||
|
}
|
||
|
dst2 = gdImageCreateTrueColor(newx, newy);
|
||
|
if (dst2 == NULL) {
|
||
|
gdImageDestroy(dst1);
|
||
|
return NULL;
|
||
|
}
|
||
|
|
||
|
#ifdef HAVE_GD_BUNDLED
|
||
|
dst2->alphaBlendingFlag = gdEffectReplace;
|
||
|
#else
|
||
|
gdImageAlphaBlending(dst2, 0);
|
||
|
#endif
|
||
|
|
||
|
if (ignoretransparent) {
|
||
|
dst2->transparent = dst1->transparent;
|
||
|
}
|
||
|
|
||
|
for (u = 0; u < dst2->sx; u++, dOffset -= dSinE) {
|
||
|
iShear = (int)floor (dOffset);
|
||
|
gdImageSkewY(dst2, dst1, u, iShear, (dOffset - (double)iShear), clrBack, ignoretransparent);
|
||
|
}
|
||
|
|
||
|
/* 3rd shear */
|
||
|
gdImageDestroy(dst1);
|
||
|
|
||
|
newx = (int) ((double)src->sy * fabs (dSinE) + (double)src->sx * cos (dRadAngle)) + 1;
|
||
|
newy = dst2->sy;
|
||
|
|
||
|
if (src->trueColor) {
|
||
|
f = gdImageGetTrueColorPixel;
|
||
|
} else {
|
||
|
f = gdImageGetPixel;
|
||
|
}
|
||
|
dst3 = gdImageCreateTrueColor(newx, newy);
|
||
|
if (dst3 == NULL) {
|
||
|
gdImageDestroy(dst2);
|
||
|
return NULL;
|
||
|
}
|
||
|
|
||
|
#ifdef HAVE_GD_BUNDLED
|
||
|
dst3->alphaBlendingFlag = gdEffectReplace;
|
||
|
#else
|
||
|
gdImageAlphaBlending(dst3, 0);
|
||
|
#endif
|
||
|
|
||
|
if (ignoretransparent) {
|
||
|
dst3->transparent = dst2->transparent;
|
||
|
}
|
||
|
|
||
|
if (dSinE >= 0.0) {
|
||
|
dOffset = (double)(src->sx - 1) * dSinE * -dTan;
|
||
|
} else {
|
||
|
dOffset = dTan * ((double)(src->sx - 1) * -dSinE + (double)(1 - newy));
|
||
|
}
|
||
|
|
||
|
for (u = 0; u < dst3->sy; u++, dOffset += dTan) {
|
||
|
int iShear = (int)floor(dOffset);
|
||
|
gdImageSkewX(dst3, dst2, u, iShear, (dOffset - iShear), clrBack, ignoretransparent);
|
||
|
}
|
||
|
|
||
|
gdImageDestroy(dst2);
|
||
|
|
||
|
return dst3;
|
||
|
}
|
||
|
|
||
|
gdImagePtr gdImageRotate (gdImagePtr src, double dAngle, int clrBack, int ignoretransparent)
|
||
|
{
|
||
|
gdImagePtr pMidImg;
|
||
|
gdImagePtr rotatedImg;
|
||
|
|
||
|
if (src == NULL) {
|
||
|
return NULL;
|
||
|
}
|
||
|
|
||
|
if (!gdImageTrueColor(src) && (clrBack < 0 || clrBack>=gdImageColorsTotal(src))) {
|
||
|
return NULL;
|
||
|
}
|
||
|
|
||
|
while (dAngle >= 360.0) {
|
||
|
dAngle -= 360.0;
|
||
|
}
|
||
|
|
||
|
while (dAngle < 0) {
|
||
|
dAngle += 360.0;
|
||
|
}
|
||
|
|
||
|
if (dAngle == 90.00) {
|
||
|
return gdImageRotate90(src, ignoretransparent);
|
||
|
}
|
||
|
if (dAngle == 180.00) {
|
||
|
return gdImageRotate180(src, ignoretransparent);
|
||
|
}
|
||
|
if(dAngle == 270.00) {
|
||
|
return gdImageRotate270 (src, ignoretransparent);
|
||
|
}
|
||
|
|
||
|
if ((dAngle > 45.0) && (dAngle <= 135.0)) {
|
||
|
pMidImg = gdImageRotate90 (src, ignoretransparent);
|
||
|
dAngle -= 90.0;
|
||
|
} else if ((dAngle > 135.0) && (dAngle <= 225.0)) {
|
||
|
pMidImg = gdImageRotate180 (src, ignoretransparent);
|
||
|
dAngle -= 180.0;
|
||
|
} else if ((dAngle > 225.0) && (dAngle <= 315.0)) {
|
||
|
pMidImg = gdImageRotate270 (src, ignoretransparent);
|
||
|
dAngle -= 270.0;
|
||
|
} else {
|
||
|
return gdImageRotate45 (src, dAngle, clrBack, ignoretransparent);
|
||
|
}
|
||
|
|
||
|
if (pMidImg == NULL) {
|
||
|
return NULL;
|
||
|
}
|
||
|
|
||
|
rotatedImg = gdImageRotate45 (pMidImg, dAngle, clrBack, ignoretransparent);
|
||
|
gdImageDestroy(pMidImg);
|
||
|
|
||
|
return rotatedImg;
|
||
|
}
|
||
|
/* End Rotate function */
|
||
|
|
||
|
|