FreeCalypso > hg > freecalypso-sw
view miscutil/fc-rgbconv.c @ 992:a7b0b426f9ca
target-utils: boot ROM UART autodetection revamped
The new implementation should work with both the familiar Calypso C035
boot ROM version found in our regular targets as well as the older
Calypso F741979B version found on the vintage D-Sample board.
author | Mychaela Falconia <falcon@ivan.Harhan.ORG> |
---|---|
date | Wed, 30 Dec 2015 21:28:41 +0000 |
parents | 813287f7169c |
children |
line wrap: on
line source
/* * 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; }