| | typedef struct _HSV {
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| | float h;
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| | float s;
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| | float v;
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| | } HSV, *PHSV, *LPHSV;
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| |
|
| | HSV rgbQuadToHSV(RGBQUAD rgbQuad) {
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| | HSV hsl;
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| |
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| | BYTE r = rgbQuad.rgbRed, g = rgbQuad.rgbGreen, b = rgbQuad.rgbBlue;
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| | float fr = (float)r/255.f;
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| | float fg = (float)g/255.f;
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| | float fb = (float)b/255.f;
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| |
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| | float minr = fmin(fmin(fr, fg), fb), maxr = fmax(fmax(fr, fg), fb);
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| | float delta = maxr-minr;
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| | float delr, delg, delb;
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| |
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| | float h = 0.f, s = 0.f, l = (float)((maxr+minr)/2.f);
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| |
|
| | if (delta != 0.f) {
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| | s = l < 0.5f ? (float)(delta / (maxr + minr)) : (float)(delta / (2.f - maxr - minr));
|
| | delr = (float)(((maxr - fr) / 6.f + (delta / 2.f)) / delta);
|
| | delg = (float)(((maxr - fg) / 6.f + (delta / 2.f)) / delta);
|
| | delb = (float)(((maxr - fb) / 6.f + (delta / 2.f)) / delta);
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| |
|
| | if (fr == maxr) h = delb-delg;
|
| | else if (fg == maxr) h = (1.f / 3.f) + delr - delb;
|
| | else if (fb == maxr) h = (2.f / 3.f) + delg - delr;
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| | if (h < 0.f) h += 1.f;
|
| | if (h > 1.f) h -= 1.f;
|
| | }
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| |
|
| | hsl.h = h;
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| | hsl.s = s;
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| | hsl.v = l;
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| | return hsl;
|
| | }
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| |
|
| | RGBQUAD hsvToRGB(HSV hsl) {
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| | RGBQUAD rgbq;
|
| | float r = hsl.v, g = hsl.v, b = hsl.v;
|
| | float h = hsl.h, s2 = hsl.s, l = hsl.v;
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| | float vh = (l <= 0.5f) ? (l*(1.f + s2)) : (l+s2-l*s2);
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| |
|
| | float m, sv, frac, vsf, mid, mid2;
|
| | int st;
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| |
|
| | if (vh > 0.f) {
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| | m = l + l - vh;
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| | sv = (vh - m) / vh;
|
| | h *= 6.f;
|
| | st = (int)h;
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| | frac = h-st;
|
| | vsf = vh*sv*frac;
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| | mid = m+vsf;
|
| | mid2 = vh-vsf;
|
| | switch(st) {
|
| | case 0:
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| | r = vh;
|
| | g = mid;
|
| | b = m;
|
| | break;
|
| | case 1:
|
| | r = mid2;
|
| | g = vh;
|
| | b = m;
|
| | break;
|
| | case 2:
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| | r = m;
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| | g = vh;
|
| | b = mid;
|
| | break;
|
| | case 3:
|
| | r = m;
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| | g = mid2;
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| | b = vh;
|
| | break;
|
| | case 4:
|
| | r = mid;
|
| | g = m;
|
| | b = vh;
|
| | break;
|
| | case 5:
|
| | r = vh;
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| | g = m;
|
| | b = mid2;
|
| | break;
|
| | }
|
| | }
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| |
|
| | rgbq.rgbRed = (BYTE)(r*255.f);
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| | rgbq.rgbGreen = (BYTE)(g*255.f);
|
| | rgbq.rgbBlue = (BYTE)(b*255.f);
|
| | return rgbq;
|
| | }
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| |
|
