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Rev | Author | Line No. | Line |
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54 | pj | 1 | |
2 | #include <stdlib.h> |
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3 | #include <string.h> |
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4 | |||
5 | #include "timing.h" |
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6 | #include "libvga.h" /* for __svgalib_infotable and ramdac inlines */ |
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7 | #include "ramdac.h" //SHARK |
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8 | #include "accel.h" |
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9 | |||
10 | |||
11 | /* |
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12 | * This is a temporary function that allocates and fills in a ModeInfo |
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13 | * structure based on a svgalib mode number. |
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14 | */ |
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15 | |||
16 | ModeInfo * |
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17 | __svgalib_createModeInfoStructureForSvgalibMode(int mode) |
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18 | { |
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19 | ModeInfo *modeinfo; |
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20 | /* Create the new ModeInfo structure. */ |
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21 | modeinfo = malloc(sizeof(ModeInfo)); |
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22 | modeinfo->width = __svgalib_infotable[mode].xdim; |
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23 | modeinfo->height = __svgalib_infotable[mode].ydim; |
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24 | modeinfo->bytesPerPixel = __svgalib_infotable[mode].bytesperpixel; |
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25 | switch (__svgalib_infotable[mode].colors) { |
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26 | case 16: |
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27 | modeinfo->colorBits = 4; |
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28 | break; |
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29 | case 256: |
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30 | modeinfo->colorBits = 8; |
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31 | break; |
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32 | case 32768: |
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33 | modeinfo->colorBits = 15; |
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34 | modeinfo->blueOffset = 0; |
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35 | modeinfo->greenOffset = 5; |
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36 | modeinfo->redOffset = 10; |
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37 | modeinfo->blueWeight = 5; |
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38 | modeinfo->greenWeight = 5; |
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39 | modeinfo->redWeight = 5; |
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40 | break; |
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41 | case 65536: |
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42 | modeinfo->colorBits = 16; |
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43 | modeinfo->blueOffset = 0; |
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44 | modeinfo->greenOffset = 5; |
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45 | modeinfo->redOffset = 11; |
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46 | modeinfo->blueWeight = 5; |
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47 | modeinfo->greenWeight = 6; |
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48 | modeinfo->redWeight = 5; |
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49 | break; |
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50 | case 256 * 65536: |
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51 | modeinfo->colorBits = 24; |
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52 | modeinfo->blueOffset = 0; |
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53 | modeinfo->greenOffset = 8; |
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54 | modeinfo->redOffset = 16; |
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55 | modeinfo->blueWeight = 8; |
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56 | modeinfo->greenWeight = 8; |
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57 | modeinfo->redWeight = 8; |
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58 | break; |
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59 | } |
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60 | modeinfo->bitsPerPixel = modeinfo->bytesPerPixel * 8; |
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61 | if (__svgalib_infotable[mode].colors == 16) |
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62 | modeinfo->bitsPerPixel = 4; |
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63 | modeinfo->lineWidth = __svgalib_infotable[mode].xbytes; |
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64 | return modeinfo; |
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65 | } |
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66 | |||
67 | |||
68 | /* |
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69 | * This function converts a number of significant color bits to a matching |
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70 | * DAC mode type as defined in the RAMDAC interface. |
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71 | */ |
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72 | |||
73 | int __svgalib_colorbits_to_colormode(int bpp, int colorbits) |
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74 | { |
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75 | if (colorbits == 8) |
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76 | return CLUT8_6; |
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77 | if (colorbits == 15) |
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78 | return RGB16_555; |
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79 | if (colorbits == 16) |
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80 | return RGB16_565; |
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81 | if (colorbits == 24) { |
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82 | if (bpp == 24) |
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83 | return RGB24_888_B; |
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84 | else |
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85 | return RGB32_888_B; |
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86 | } |
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87 | return CLUT8_6; |
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88 | } |
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89 | |||
90 | |||
91 | /* |
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92 | * Clear the accelspecs structure (disable acceleration). |
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93 | */ |
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94 | |||
95 | void __svgalib_clear_accelspecs(AccelSpecs * accelspecs) |
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96 | { |
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97 | memset(accelspecs, 0, sizeof(AccelSpecs)); |
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98 | } |