FreeCalypso > hg > freecalypso-tools

annotate miscutil/fc-rgbconv.c @ 416:30f6d1c32c6f

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doc/Flash-boot-defect article removed (no longer relevant) This article is no longer relevant because the issue in question only affected one (1) defective FCDEV3B board which was not and never will be sold.
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 26 Oct 2018 07:11:08 +0000
parents e7502631a0f9
children
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Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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Mychaela Falconia <falcon@freecalypso.org>
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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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Mychaela Falconia <falcon@freecalypso.org>
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6 * intuitive, at least to those who understand RGB.
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Mychaela Falconia <falcon@freecalypso.org>
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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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Mychaela Falconia <falcon@freecalypso.org>
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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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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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Mychaela Falconia <falcon@freecalypso.org>
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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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Mychaela Falconia <falcon@freecalypso.org>
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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 }