FreeCalypso > hg > freecalypso-tools
annotate miscutil/fc-rgbconv.c @ 373:1fa4dcbb1c87
fcup-smsendmult program written, compiles
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Thu, 08 Mar 2018 19:47:40 +0000 |
parents | e7502631a0f9 |
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0
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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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3 * phones targeted by FreeCalypso implement 16-bit color in RGB 5:6:5 format, |
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4 * but these 16-bit color words are not particularly intuitive in raw hex form. |
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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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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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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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71 exit(0); |
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72 case 6: |
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73 convert_888_to_565(in); |
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74 exit(0); |
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75 } |
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76 goto usage; |
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77 } |