[Git][freetype/freetype-demos][master] * graph/gblender.c (gblender_set_gamma_table): Reintroduce linear loops.

[Alexei Podtelezhnikov (@apodtele)]

Alexei Podtelezhnikov pushed to branch master at FreeType / FreeType Demo Programs

Commits:

• fafe3433
  by Alexei Podtelezhnikov at 2022-08-17T14:03:14+00:00

  * graph/gblender.c (gblender_set_gamma_table): Reintroduce linear loops.

1 changed file:

• graph/gblender.c

Changes:

graph/gblender.c

---

...	...	@@ -72,44 +72,25 @@ gblender_set_gamma_table( double gamma_value,
72	72	if ( gamma_value <= 0 ) /* special case for sRGB */
73	73	{
74	74	double d;
75		- int linear = 0;
76	75
77	76
78	77	/* voltage to linear; power function using finite differences */
79		- for ( p = gmax, ii = 255; ii >= 0; ii--, p -= d )
	78	+ for ( p = gmax, ii = 255; ii > 10; ii--, p -= d )
80	79	{
81	80	gamma_ramp[ii] = (unsigned short)( p + 0.5 );
82		-
83		- if ( linear )
84		- continue;
85		-
86	81	d = 2.4 * p / ( ii + 255. * 0.055 ); /* derivative */
87		-
88		- if ( ii == 10 ) /* same as d < p / ii */
89		- {
90		- d = p / ii;
91		- linear = 1;
92		- }
93	82	}
94		-
95		- linear = 0;
	83	+ for ( d = p / ii; ii >= 0; ii--, p -= d )
	84	+ gamma_ramp[ii] = (unsigned short)( p + 0.5 );
96	85
97	86	/* linear to voltage; power function using finite differences */
98		- for ( p = 255., ii = gmax; ii >= 0; ii--, p -= d )
	87	+ for ( p = 255., ii = gmax; p > 10.02; ii--, p -= d )
99	88	{
100	89	gamma_ramp_inv[ii] = (unsigned char)( p + 0.5 );
101		-
102		- if ( linear )
103		- continue;
104		-
105	90	d = ( p + 255. * 0.055 ) / ( 2.4 * ii ); /* derivative */
106		-
107		- if ( p < 10.02 ) /* same as d > p / ii */
108		- {
109		- d = p / ii;
110		- linear = 1;
111		- }
112	91	}
	92	+ for ( d = p / ii; ii >= 0; ii--, p -= d )
	93	+ gamma_ramp_inv[ii] = (unsigned short)( p + 0.5 );
113	94	}
114	95	else
115	96	{

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