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Update gamma correction table to take into account Freetype's own recomandation #116755

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RyuukkDev wants to merge 1 commits from RyuukkDev/blender:gamma into main
pull from: RyuukkDev/blender:gamma
merge into: blender:main

When changing the target branch, be careful to rebase the branch in your fork to match. See documentation.
Conversation 2 Commits 1 Files Changed 1 +18 -15
1 changed files with 18 additions and 15 deletions
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33
source/blender/blenfont/intern/blf_glyph.cc
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@ -204,25 +204,28 @@ static GlyphBLF *blf_glyph_cache_find_glyph(const GlyphCacheBLF *gc,
* and use a lower gamma value, so we get a bit better anti-aliasing, but the fonts don't look too
* heavy."
* https://www.puredevsoftware.com/blog/2019/01/22/sub-pixel-gamma-correct-font-rendering/
* Update 2024:
* Freetype recomands using 1.8 as gamma
* https://freetype.org/freetype2/docs/hinting/text-rendering-general.html
*/
static uchar blf_glyph_gamma(uchar c)
{
/* The following is `char(powf(c / 256.0f, 1.0f / 1.43f) * 256.0f)`. */
/* The following is `char(powf(c / 256.0f, 1.0f / 1.8f) * 256.0f)`. */
static const uchar gamma[256] = {
0, 5, 9, 11, 14, 16, 19, 21, 23, 25, 26, 28, 30, 32, 34, 35, 37, 38,
40, 41, 43, 44, 46, 47, 49, 50, 52, 53, 54, 56, 57, 58, 60, 61, 62, 64,
65, 66, 67, 69, 70, 71, 72, 73, 75, 76, 77, 78, 79, 80, 82, 83, 84, 85,
86, 87, 88, 89, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104,
105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122,
123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 133, 134, 135, 136, 137, 138, 139,
140, 141, 142, 143, 143, 144, 145, 146, 147, 148, 149, 150, 151, 151, 152, 153, 154, 155,
156, 157, 157, 158, 159, 160, 161, 162, 163, 163, 164, 165, 166, 167, 168, 168, 169, 170,
171, 172, 173, 173, 174, 175, 176, 177, 178, 178, 179, 180, 181, 182, 182, 183, 184, 185,
186, 186, 187, 188, 189, 190, 190, 191, 192, 193, 194, 194, 195, 196, 197, 198, 198, 199,
200, 201, 201, 202, 203, 204, 205, 205, 206, 207, 208, 208, 209, 210, 211, 211, 212, 213,
214, 214, 215, 216, 217, 217, 218, 219, 220, 220, 221, 222, 223, 223, 224, 225, 226, 226,
227, 228, 229, 229, 230, 231, 231, 232, 233, 234, 234, 235, 236, 237, 237, 238, 239, 239,
240, 241, 242, 242, 243, 244, 244, 245, 246, 247, 247, 248, 249, 249, 250, 251, 251, 252,
0, 11, 17, 21, 25, 28, 31, 34, 37, 39, 42, 44, 46, 48, 50, 52, 54, 56,
58, 60, 62, 63, 65, 67, 68, 70, 71, 73, 74, 76, 77, 79, 80, 82, 83, 84,
86, 87, 88, 90, 91, 92, 93, 95, 96, 97, 98, 99, 101, 102, 103, 104, 105, 106,
107, 108, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125,
126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 136, 137, 138, 139, 140, 141, 142,
143, 144, 144, 145, 146, 147, 148, 149, 150, 151, 151, 152, 153, 154, 155, 156, 156, 157,
158, 159, 160, 160, 161, 162, 163, 164, 164, 165, 166, 167, 168, 168, 169, 170, 171, 171,
172, 173, 174, 174, 175, 176, 177, 177, 178, 179, 180, 180, 181, 182, 183, 183, 184, 185,
185, 186, 187, 188, 188, 189, 190, 190, 191, 192, 193, 193, 194, 195, 195, 196, 197, 197,
198, 199, 199, 200, 201, 201, 202, 203, 203, 204, 205, 205, 206, 207, 207, 208, 209, 209,
210, 211, 211, 212, 213, 213, 214, 215, 215, 216, 216, 217, 218, 218, 219, 220, 220, 221,
221, 222, 223, 223, 224, 225, 225, 226, 226, 227, 228, 228, 229, 229, 230, 231, 231, 232,
232, 233, 234, 234, 235, 235, 236, 237, 237, 238, 238, 239, 240, 240, 241, 241, 242, 242,
243, 244, 244, 245, 245, 246, 246, 247, 248, 248, 249, 249, 250, 250, 251, 252, 252, 253,
253, 254, 254, 255};
return gamma[c];
}