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rgb555conv
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# rgb555conv - converts 24 bit color to 15 bit color
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I got tired of manually converting 24 bit hex colors (like `0xRRGGBB`) into 15
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bit RGB555 colors (like `0b0BBBBBGGGGGRRRRR`) so I slapped this together to do
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it for me. Be warned that the 4 character color it outputs is in BGR format
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instead of RGB for use on the Game Boy Color and Game Boy Advance. It also
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outputs a 24 bit representation of the 15 bit color (still in `0xRRGGBB`) for
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use in things like your sprite software.
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This is free and unencumbered software released into the public domain.
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Anyone is free to copy, modify, publish, use, compile, sell, or
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distribute this software, either in source code form or as a compiled
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binary, for any purpose, commercial or non-commercial, and by any
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means.
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In jurisdictions that recognize copyright laws, the author or authors
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of this software dedicate any and all copyright interest in the
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software to the public domain. We make this dedication for the benefit
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of the public at large and to the detriment of our heirs and
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successors. We intend this dedication to be an overt act of
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relinquishment in perpetuity of all present and future rights to this
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software under copyright law.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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For more information, please refer to <http://unlicense.org/>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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typedef struct {
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uint8_t r;
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uint8_t g;
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uint8_t b;
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} rgb888;
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int main (int argc, char *argv[])
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{
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if (argc != 2) {
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printf("Please provide a single 24 bit color of the format `0xRRGGBB` as input.\n");
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return 1;
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}
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uint32_t in_888 = strtol(argv[1], NULL, 16);
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printf(" Input, 24 bit color, 6 char hex: #%06X\n\n", in_888);
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rgb888 split;
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split.r = (in_888 & 0x00FF0000) >> 16;
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split.g = (in_888 & 0x0000FF00) >> 8;
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split.b = in_888 & 0x000000FF;
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// Basic rounding
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if (split.r & 4) split.r |= 8;
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if (split.g & 4) split.g |= 8;
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if (split.b & 4) split.b |= 8;
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int16_t rgb555 = ((split.b & 0xF8) << 7) | ((split.g & 0xF8) << 2) | (split.r >> 3);
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printf("Output, 15 bit color, 4 char hex: 0x%04X\n", rgb555);
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printf("Output, 15 bit color, 6 char hex: #%06X\n", (uint32_t) ((split.r & 0xF8) << 16) | ((split.g & 0xF8) << 8) | (split.b & 0xF8));
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return 0;
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}
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