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Speedup for DCPProfile::apply

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This commit is contained in:
heckflosse 2016-06-09 23:42:32 +02:00
parent b50de693a0
commit c086177032
1 changed files with 68 additions and 0 deletions
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68
rtengine/color.h
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@ -231,6 +231,35 @@ public:
*/
static void rgb2hsv (float r, float g, float b, float &h, float &s, float &v);
static inline void rgb2hsvdcp(float r, float g, float b, float &h, float &s, float &v)
{
float var_Min = min(r, g, b);
float var_Max = max(r, g, b);
float del_Max = var_Max - var_Min;
v = var_Max / 65535.f;
if (fabsf(del_Max) < 0.00001f) {
h = 0.f;
s = 0.f;
} else {
s = del_Max / var_Max;
if ( r == var_Max ) {
h = (g - b) / del_Max;
} else if ( g == var_Max ) {
h = 2.f + (b - r) / del_Max;
} else { /*if ( b == var_Max ) */
h = 4.f + (r - g) / del_Max;
}
if ( h < 0.f ) {
h += 6.f;
} else if ( h > 6.f ) {
h -= 6.f;
}
}
}
/**
* @brief Convert hue saturation value in red green blue
@ -242,6 +271,45 @@ public:
* @param b blue channel [0 ; 65535] (return value)
*/
static void hsv2rgb (float h, float s, float v, float &r, float &g, float &b);
static inline void hsv2rgbdcp (float h, float s, float v, float &r, float &g, float &b)
{
// special version for dcp which saves 1 division (in caller) and six multiplications (inside this function)
int i = h; // sector 0 to 5, floor() is very slow, and h is always >0
float f = h - i; // fractional part of h
v *= 65535.f;
float vs = v * s;
float p = v - vs;
float q = v - f * vs;
float t = p + v - q;
if (i == 1) {
r = q;
g = v;
b = p;
} else if (i == 2) {
r = p;
g = v;
b = t;
} else if (i == 3) {
r = p;
g = q;
b = v;
} else if (i == 4) {
r = t;
g = p;
b = v;
} else if (i == 5) {
r = v;
g = p;
b = q;
} else { /*i==(0|6)*/
r = v;
g = t;
b = p;
}
}
static void hsv2rgb (float h, float s, float v, int &r, int &g, int &b);