colors.cpp File Reference

#include "qimageblitz.h"
#include <config-processor.h>
#include "private/inlinehsv.h"
#include "private/blitz_p.h"
#include "blitzcpu.h"
#include <QVector>

Include dependency graph for colors.cpp:

Go to the source code of this file.

Variables
static char	contrast_table [128]

---

Variable Documentation

char contrast_table[128] [static]

Initial value:

 {
    0, 1, 1, 2, 3, 3, 4, 4, 5, 5, 6, 7, 7, 8, 8, 9, 9,
    10, 10, 11, 11, 12, 12, 13, 13, 14, 14, 15, 15, 16, 16, 17,
    17, 18, 18, 19, 19, 19, 20, 20, 21, 21, 21, 22, 22, 22, 23,
    23, 23, 24, 24, 24, 24, 25, 25, 25, 25, 25, 26, 26, 26, 26,
    26, 26, 26, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
    27, 26, 26, 26, 26, 26, 26, 26, 25, 25, 25, 25, 24, 24, 24,
    23, 23, 23, 22, 22, 21, 21, 20, 20, 20, 19, 18, 18, 17, 17,
    16, 16, 15, 14, 14, 13, 12, 11, 11, 10, 9, 8, 7, 7, 6, 5,
    4, 3, 2, 1, 0
}

Precalculated increment values for HSV contrast.

Saves some expensive floating point math. These are half the integer results of:

alpha*(alpha*(sin(M_PI*(brightness-alpha))+1.0)-brightness)

where alpha is 0.5+M_EPSILON and brightness is the percentage for values ranging from 0 to 255, (Qt compatible HSV brightness values). The other half of the lookup table is the inverse of these values. I am so clever :) (mosfet)

Definition at line 54 of file colors.cpp.