Source

gd-libgd / src / gd_rotate.c

Ondřej Surý f52b1dd 


Pierre Joye 423c939 
Ondřej Surý f52b1dd 
Pierre Joye 423c939 











Ondřej Surý 173bd59 
Pierre Joye 423c939 

















































Pierre Joye db84755 


Pierre Joye 423c939 




















































































































































Ondřej Surý 15ea6bc 

Pierre Joye 423c939 











































Ondřej Surý 15ea6bc 

Pierre Joye 423c939 












































Ondřej Surý 15ea6bc 

Pierre Joye 423c939 


































Remi Collet 8b3bb51 


Pierre Joye 423c939 


















































































































































































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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */

#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 */

typedef int (BGD_STDCALL *FuncPtr)(gdImagePtr, int, int);

#define ROTATE_DEG2RAD  3.1415926535897932384626433832795/180
void gdImageSkewX (gdImagePtr dst, gdImagePtr src, int uRow, int iOffset, double dWeight, int clrBack, int ignoretransparent)
{
	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)
{
	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;
	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->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;
	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->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;
	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->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;
}

gdImagePtr gdImageRotate45 (gdImagePtr src, double dAngle, int clrBack, int ignoretransparent)
{
	gdImagePtr dst1,dst2,dst3;
	double dRadAngle, dSinE, dTan, dShear;
	double dOffset;     /* Variable skew offset */
	int u, iShear, newx, newy;
	int clrBackR, clrBackG, clrBackB, clrBackA;

	/* See GEMS I for the algorithm details */
	dRadAngle = dAngle * ROTATE_DEG2RAD; /* Angle in radians */
	dSinE = sin (dRadAngle);
	dTan = tan (dRadAngle / 2.0);

	newx = (int)(src->sx + src->sy * fabs(dTan));
	newy = src->sy;

	/* 1st shear */
	dst1 = gdImageCreateTrueColor(newx, newy);
	/******* Perform 1st shear (horizontal) ******/
	if (dst1 == NULL) {
		return NULL;
	}
#ifdef HAVE_GD_BUNDLED
	dst1->alphaBlendingFlag = gdEffectReplace;
#else
	gdImageAlphaBlending(dst1, 0);
#endif
	if (dAngle == 0.0) {
		/* Returns copy of src */
		gdImageCopy (dst1, src,0,0,0,0,src->sx,src->sy);
		return dst1;
	}

	gdImagePaletteCopy (dst1, src);

	if (ignoretransparent) {
		if (gdImageTrueColor(src)) {
			dst1->transparent = src->transparent;
		} else {

			dst1->transparent = gdTrueColorAlpha(gdImageRed(src, src->transparent), gdImageBlue(src, src->transparent), gdImageGreen(src, src->transparent), 127);
		}
	}

	for (u = 0; u < dst1->sy; u++) {
		if (dTan >= 0.0) {
			dShear = ((double)(u + 0.5)) * dTan;
		} else {
			dShear = ((double)(u - dst1->sy) + 0.5) * dTan;
		}

		iShear = (int)floor(dShear);
		gdImageSkewX(dst1, src, u, iShear, (dShear - iShear), clrBack, ignoretransparent);
	}

	/*
	The 1st shear may use the original clrBack as color index
	Convert it once here
	*/
	if(!src->trueColor) {
		clrBackR = gdImageRed(src, clrBack);
		clrBackG = gdImageGreen(src, clrBack);
		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;

	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;

	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 */
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