FreeCalypso > hg > freecalypso-tools
view miscutil/fc-rgbconv.c @ 105:6803e0e83b30
target-utils: pirexplore converted to our own libc
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Tue, 01 Nov 2016 00:38:49 +0000 |
parents | e7502631a0f9 |
children |
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/* * This utility is an aid for phone UI development. The color LCDs in the * phones targeted by FreeCalypso implement 16-bit color in RGB 5:6:5 format, * but these 16-bit color words are not particularly intuitive in raw hex form. * In contrast, a 24-bit RGB 8:8:8 color given in RRGGBB hex form is quite * intuitive, at least to those who understand RGB. * * This utility performs the conversion. It takes a single command line * argument that must be either 4 or 6 hex digits. If the argument is 4 hex * digits, it is interpreted as RGB 5:6:5 and converted into RGB 8:8:8. * If the argument is 6 hex digits, it is interpreted as RGB 8:8:8 and * converted into RGB 5:6:5. The output of the conversion is emitted on * stdout as 4 or 6 hex digits. */ #include <stdio.h> #include <stdlib.h> #include <ctype.h> #include <string.h> is_arg_all_hex(str) char *str; { char *cp; int c; for (cp = str; c = *cp++; ) if (!isxdigit(c)) return(0); return(1); } convert_565_to_888(in) unsigned in; { unsigned r, g, b; r = in >> 11; g = (in >> 5) & 0x3F; b = in & 0x1F; printf("%02X%02X%02X\n", r << 3, g << 2, b << 3); } convert_888_to_565(in) unsigned in; { unsigned r, g, b; r = (in >> 16) >> 3; g = ((in >> 8) & 0xFF) >> 2; b = (in & 0xFF) >> 3; printf("%04X\n", (r << 11) | (g << 5) | b); } main(argc, argv) char **argv; { unsigned in; if (argc != 2) { usage: fprintf(stderr, "please specify one 4-digit or 6-digit hex RGB value\n"); exit(1); } if (!is_arg_all_hex(argv[1])) goto usage; in = strtoul(argv[1], 0, 16); switch (strlen(argv[1])) { case 4: convert_565_to_888(in); exit(0); case 6: convert_888_to_565(in); exit(0); } goto usage; }