diff options
Diffstat (limited to 'Build/source/libs/gd/libgd-2.1.0-rc1/src/gd_rotate.c')
-rw-r--r-- | Build/source/libs/gd/libgd-2.1.0-rc1/src/gd_rotate.c | 534 |
1 files changed, 534 insertions, 0 deletions
diff --git a/Build/source/libs/gd/libgd-2.1.0-rc1/src/gd_rotate.c b/Build/source/libs/gd/libgd-2.1.0-rc1/src/gd_rotate.c new file mode 100644 index 00000000000..b119d2c4975 --- /dev/null +++ b/Build/source/libs/gd/libgd-2.1.0-rc1/src/gd_rotate.c @@ -0,0 +1,534 @@ +#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 */ + + 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); + } + } + + dRadAngle = dAngle * ROTATE_DEG2RAD; /* Angle in radians */ + dSinE = sin (dRadAngle); + dTan = tan (dRadAngle / 2.0); + + 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 */ + + |