FreeCalypso > hg > freecalypso-tools

annotate miscutil/fc-rgbconv.c @ 8:2748f257312b

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doc/TCH-bit-access: new write-up
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 14 Jun 2016 07:13:46 +0000
parents e7502631a0f9
children
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Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * This utility is an aid for phone UI development. The color LCDs in the
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Mychaela Falconia <falcon@freecalypso.org>
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3 * phones targeted by FreeCalypso implement 16-bit color in RGB 5:6:5 format,
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Mychaela Falconia <falcon@freecalypso.org>
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4 * but these 16-bit color words are not particularly intuitive in raw hex form.
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Mychaela Falconia <falcon@freecalypso.org>
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5 * In contrast, a 24-bit RGB 8:8:8 color given in RRGGBB hex form is quite
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6 * intuitive, at least to those who understand RGB.
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7 *
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8 * This utility performs the conversion. It takes a single command line
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9 * argument that must be either 4 or 6 hex digits. If the argument is 4 hex
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10 * digits, it is interpreted as RGB 5:6:5 and converted into RGB 8:8:8.
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11 * If the argument is 6 hex digits, it is interpreted as RGB 8:8:8 and
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12 * converted into RGB 5:6:5. The output of the conversion is emitted on
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13 * stdout as 4 or 6 hex digits.
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14 */
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15
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16 #include <stdio.h>
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17 #include <stdlib.h>
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18 #include <ctype.h>
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19 #include <string.h>
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20
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21 is_arg_all_hex(str)
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22 char *str;
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23 {
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24 char *cp;
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25 int c;
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26
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27 for (cp = str; c = *cp++; )
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28 if (!isxdigit(c))
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29 return(0);
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30 return(1);
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31 }
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32
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33 convert_565_to_888(in)
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34 unsigned in;
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35 {
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36 unsigned r, g, b;
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37
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38 r = in >> 11;
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39 g = (in >> 5) & 0x3F;
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40 b = in & 0x1F;
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41 printf("%02X%02X%02X\n", r << 3, g << 2, b << 3);
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42 }
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43
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44 convert_888_to_565(in)
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Mychaela Falconia <falcon@freecalypso.org>
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45 unsigned in;
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46 {
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47 unsigned r, g, b;
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48
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49 r = (in >> 16) >> 3;
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50 g = ((in >> 8) & 0xFF) >> 2;
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51 b = (in & 0xFF) >> 3;
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52 printf("%04X\n", (r << 11) | (g << 5) | b);
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53 }
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54
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55 main(argc, argv)
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56 char **argv;
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57 {
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58 unsigned in;
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59
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60 if (argc != 2) {
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61 usage: fprintf(stderr,
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62 "please specify one 4-digit or 6-digit hex RGB value\n");
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63 exit(1);
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64 }
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65 if (!is_arg_all_hex(argv[1]))
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66 goto usage;
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Mychaela Falconia <falcon@freecalypso.org>
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67 in = strtoul(argv[1], 0, 16);
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68 switch (strlen(argv[1])) {
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69 case 4:
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70 convert_565_to_888(in);
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Mychaela Falconia <falcon@freecalypso.org>
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71 exit(0);
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72 case 6:
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73 convert_888_to_565(in);
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Mychaela Falconia <falcon@freecalypso.org>
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74 exit(0);
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75 }
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Mychaela Falconia <falcon@freecalypso.org>
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76 goto usage;
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Mychaela Falconia <falcon@freecalypso.org>
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77 }