图片旋转 任意角度 图象 算法

/* From The website of Dr. Marcelo Gattass http://www.tecgraf.puc-rio.br/~mgattass/color/ http://www.codefans.net Color Conversion Routines */ #include "cc.h" #include <assert.h> #include <math.h> /* * Tristimulus reference values */ const double _ccTristimulusValues[ccNTristimulus][3] = { /* 2 degrees */ /*ccTA_2*/ { 109.850, 100.000, 35.585 } , /*ccTC_2*/ { 98.074, 100.000, 118.232 } , /* D50 */ { 96.422, 100.000, 82.521 } , /* D55 */ { 95.682, 100.000, 92.149 } , /* D65 */ { 95.047, 100.000, 108.883 } , /* D75 */ { 94.972, 100.000, 122.638 } , /* F2 */ { 99.187, 100.000, 67.395 } , /* F7 */ { 95.044, 100.000, 108.755 } , /* F11 */ { 100.966, 100.000, 64.370 } , /* 10 degrees */ /* A */ { 111.144, 100.000, 35.200 } , /* C */ { 97.285, 100.000, 116.145 } , /* D50 */ { 96.720, 100.000, 81.427 } , /* D55 */ { 95.799, 100.000, 90.926 } , /* D65 */ { 94.811, 100.000, 107.304 } , /* D75 */ { 94.416, 100.000, 120.641 } , /* F2 */ { 103.280, 100.000, 69.026 } , /* F7 */ { 95.792, 100.000, 107.687 } , /* F11 */ { 103.866, 100.000, 65.627 } }; static double ccmin(double val1, double val2, double val3) { if (val1 < val2) { if (val1 < val3) return val1; else return val3; } else if (val2 < val3) return val2; return val3; } static double ccmax(double val1, double val2, double val3) { if (val1 > val2) { if (val1 > val3) return val1; else return val3; } else if (val2 > val3) return val2; return val3; } static double Hue_2_RGB(double v1, double v2, double vH) { if (vH < 0) vH += 1; if (vH > 1) vH -= 1; if ((6 *vH) < 1) return (v1 + (v2 - v1) *6 * vH); if ((2 *vH) < 1) return (v2); if ((3 *vH) < 2) return (v1 + (v2 - v1)*((2. / 3) - vH) *6); return (v1); } static double degree_2_radian(double val) { return (val *PI) / 180; } //RGB values = From 0 to 1 int RGBtoHSL(double r, double g, double b, double *h, double *s, double *l) { double vmin, vmax, delta; double dr, dg, db; vmin = ccmin(r, g, b); // Min. value of RGB vmax = ccmax(r, g, b); // Max. value of RGB delta = vmax - vmin; // Delta RGB value *l = (vmax + vmin) / 2; if (delta == 0) // This is a gray, no chroma... { *h = 0; // HSL results = From 0 to 1 *s = 0; } else // Chromatic data... { if (*l < 0.5) *s = delta / (vmax + vmin); else *s = delta / (2-vmax - vmin); dr = (((vmax - r) / 6.0) + (delta / 2.0)) / delta; dg = (((vmax - g) / 6.0) + (delta / 2.0)) / delta; db = (((vmax - b) / 6.0) + (delta / 2.0)) / delta; if (r == vmax) *h = db - dg; else if (g == vmax) *h = (1.0 / 3.0) + dr - db; else if (b == vmax) *h = (2.0 / 3.0) + dg - dr; if (*h < 0) *h += 1; if (*h > 1) *h -= 1; } return 1; } int HSLtoRGB(double h, double s, double l, double *r, double *g, double *b) { double v1, v2; if (s == 0) // HSL values = From 0 to 1 { *r = l; // RGB results = From 0 to 1 *g = l; *b = l; } else { if (l < 0.5) v2 = l *(1+s); else v2 = (l + s) - (s *l); v1 = 2 * l - v2; *r = Hue_2_RGB(v1, v2, h + (1.0 / 3.0)); *g = Hue_2_RGB(v1, v2, h); *b = Hue_2_RGB(v1, v2, h - (1.0 / 3.0)); } return 1; } // RGB values = From 0 to 1 int fRGBtoCMY(double r, double g, double b, double *c, double *m, double *y) { assert(c && m && y); *c = 1-r; *m = 1-g; *y = 1-b; return 1; } // RGB values = From 0 to 255 int iRGBtoCMY(int r, int g, int b, double *c, double *m, double *y) { assert(c && m && y); assert(r >= 0 && r < 256); assert(g >= 0 && g < 256); assert(b >= 0 && b < 256); *c = 1-((double)r / 255); *m = 1-((double)g / 255); *y = 1-((double)b / 255); return 1; } // CMY values = From 0 to 255 int CMYtofRGB(double c, double m, double y, double *r, double *g, double *b) { assert(r && g && b); assert(c >= 0 && c <= 1); assert(m >= 0 && m <= 1); assert(y >= 0 && y <= 1); *r = (1-c); *g = (1-m); *b = (1-y); return 1; } // CMY values = From 0 to 1 int CMYtoiRGB(double c, double m, double y, int *r, int *g, int *b) { assert(r && g && b); assert(c >= 0 && c <= 1); assert(m >= 0 && m <= 1); assert(y >= 0 && y <= 1); *r = (int)(1-c) *255; *g = (int)(1-m) *255; *b = (int)(1-y) *255; return 1; } // CMY values = From 0 to 1 int CMYtoCMYK(double c, double m, double y, double *C, double *M, double *Y, double *K) { double var_K = 1; assert(C && M && Y && K); assert(c >= 0 && c <= 1); assert(m >= 0 && m <= 1); assert(y >= 0 && y <= 1); if (c < var_K) var_K = c; if (m < var_K) var_K = m; if (y < var_K) var_K = y; *C = (c - var_K) / (1-var_K); *M = (m - var_K) / (1-var_K); *Y = (y - var_K) / (1-var_K); *K = var_K; return 1; } // CMYK values = From 0 to 1 int CMYKtoCMY(double c, double m, double y, double k, double *C, double *M, double *Y) { assert(C && M && Y); assert(c >= 0 && c <= 1); assert(m >= 0 && m <= 1); assert(y >= 0 && y <= 1); assert(k >= 0 && k <= 1); *C = (c *(1-k) + k); *M = (m *(1-k) + k); *Y = (y *(1-k) + k); return 1; } int RGBtoHSV(double r, double g, double b, double *h, double *s, double *v) { double var_Min; double var_Max; double del_Max; var_Min = ccmin(r, g, b); //Min. value of RGB var_Max = ccmax(r, g, b); //Max. value of RGB del_Max = var_Max - var_Min; //Delta RGB value *v = var_Max; if (del_Max == 0) // This is a gray, no chroma... { *h = 0; // HSV results = From 0 to 1 *s = 0; } else // Chromatic data... { double del_R = (((var_Max - r) / 6) + (del_Max / 2)) / del_Max; double del_G = (((var_Max - g) / 6) + (del_Max / 2)) / del_Max; double del_B = (((var_Max - b) / 6) + (del_Max / 2)) / del_Max; *s = del_Max / var_Max; if (r == var_Max) *h = del_B - del_G; else if (g == var_Max) *h = (1. / 3) + del_R - del_B; else if (b == var_Max) *h = (2. / 3) + del_G - del_R; if (*h < 0) ; *h += 1; if (*h > 1) ; *h -= 1; } return 1; } int HSVtoRGB(double h, double s, double v, double *r, double *g, double *b) { if (s == 0) // HSV values = From 0 to 1 { *r = v; *g = v; *b = v; } else { double var_h = h * 6; double var_i = floor(var_h); double var_1 = v *(1-s); double var_2 = v *(1-s *(var_h - var_i)); double var_3 = v *(1-s *(1-(var_h - var_i))); if (var_i == 0) { *r = v; *g = var_3; *b = var_1; } else if (var_i == 1) {