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rgb555conv
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Now outputs rounded down, unrounded, and rounded up variants

This commit is contained in:
Alex Gentilucci 2020-06-02 14:32:45 -06:00
parent 77435e69cf
commit c1bdab1926
Signed by: nytpu
GPG Key ID: 144ADD49F173F5CE
1 changed files with 18 additions and 11 deletions
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29
main.c
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@ -18,26 +18,33 @@ int main (int argc, char *argv[])
uint32_t in_888 = strtol(argv[1], NULL, 16);
printf(" Input, 24 bit color, 6 char hex: #%06X\n\n", in_888);
printf(" Input, 24 bit color, 6 char hex: #%06X\n\n", in_888);
rgb888 split;
split.r = ((in_888 & 0x00FF0000) >> 16) & 0xF0;
split.g = ((in_888 & 0x0000FF00) >> 8) & 0xF0;
split.b = (in_888 & 0x000000FF) & 0xF0;
split.r = ((in_888 & 0x00FF0000) >> 16) & 0xF8;
split.g = ((in_888 & 0x0000FF00) >> 8) & 0xF8;
split.b = (in_888 & 0x000000FF) & 0xF8;
rgb888 unrounded;
unrounded.r = split.r & 0xF0;
unrounded.g = split.g & 0xF0;
unrounded.b = split.b & 0xF0;
// Basic rounding
rgb888 rounded;
rounded.r = split.r | 8;
rounded.g = split.g | 8;
rounded.b = split.b | 8;
rounded.r = unrounded.r | 8;
rounded.g = unrounded.g | 8;
rounded.b = unrounded.b | 8;
int16_t rgb555 = ((split.b & 0xF8) << 7) | ((split.g & 0xF8) << 2) | (split.r >> 3);
int16_t rgb555_unrounded = ((unrounded.b & 0xF8) << 7) | ((unrounded.g & 0xF8) << 2) | (unrounded.r >> 3);
int16_t rgb555_rounded = ((rounded.b & 0xF8) << 7) | ((rounded.g & 0xF8) << 2) | (rounded.r >> 3);
printf("Output, 15 bit color, 6 char hex, rounded down: #%06X\n", (uint32_t) ((split.r & 0xF8) << 16) | ((split.g & 0xF8) << 8) | (split.b & 0xF8));
printf("Output, 15 bit color, 6 char hex, rounded up: #%06X\n", (uint32_t) ((rounded.r & 0xF8) << 16) | ((rounded.g & 0xF8) << 8) | (rounded.b & 0xF8));
printf(" Output, 15 bit color, 6 char hex, unrounded: #%06X\n", (uint32_t) ((split.r & 0xF8) << 16) | ((split.g & 0xF8) << 8) | (split.b & 0xF8));
printf(" Output, 15 bit color, 6 char hex, rounded up: #%06X\n", (uint32_t) ((rounded.r & 0xF8) << 16) | ((rounded.g & 0xF8) << 8) | (rounded.b & 0xF8));
printf("Output, 15 bit color, 4 char hex, rounded down: 0x%04X\n", rgb555);
printf("Output, 15 bit color, 4 char hex, rounded up: 0x%04X\n", rgb555_rounded);
printf("Output, 15 bit color, 4 char hex, rounded down: 0x%04X\n", rgb555_unrounded);
printf(" Output, 15 bit color, 4 char hex, unrounded: 0x%04X\n", rgb555);
printf(" Output, 15 bit color, 4 char hex, rounded up: 0x%04X\n", rgb555_rounded);
return 0;
}