| 1 | /*
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| 2 |
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| 3 | gbmht.c - Halftoner
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| 4 |
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| 5 | */
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| 6 |
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| 7 | /*...sincludes:0:*/
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| 8 | #include <stdio.h>
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| 9 | #include <stddef.h>
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| 10 | #include <stdlib.h>
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| 11 | #include <string.h>
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| 12 | #include "gbm.h"
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| 13 |
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| 14 | /*...vgbm\46\h:0:*/
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| 15 | /*...e*/
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| 16 | /*...svars:0:*/
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| 17 | static BOOLEAN inited = FALSE;
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| 18 |
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| 19 | /*
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| 20 | For 6Rx6Gx6B, 7Rx8Gx4B palettes etc.
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| 21 | */
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| 22 |
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| 23 | static byte index4[0x400];
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| 24 | static byte index6[0x400];
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| 25 | static byte index7[0x400];
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| 26 | static byte index8[0x400];
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| 27 | static byte scale4[] = { 0, 85, 170, 255 };
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| 28 | static byte scale6[] = { 0, 51, 102, 153, 204, 255 };
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| 29 | static byte scale7[] = { 0, 43, 85, 128, 170, 213, 255 };
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| 30 | static byte scale8[] = { 0, 36, 73, 109, 146, 182, 219, 255 };
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| 31 |
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| 32 | static byte map_to_012[0x900];
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| 33 | /* Returns 0 if index < 0x80 */
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| 34 | /* 1 if index >= 0x80 and index < 0xff */
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| 35 | /* 2 if index = 0xff */
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| 36 | static byte map_to_inx[3][3][3];
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| 37 |
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| 38 | static GBMRGB gbmrgb_vga[] =
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| 39 | {
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| 40 | 0, 0, 0,
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| 41 | 128, 0, 0,
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| 42 | 0,128, 0,
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| 43 | 128,128, 0,
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| 44 | 0, 0,128,
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| 45 | 128, 0,128,
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| 46 | 0,128,128,
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| 47 | 128,128,128,
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| 48 | 204,204,204,
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| 49 | 255, 0, 0,
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| 50 | 0,255, 0,
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| 51 | 255,255, 0,
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| 52 | 0, 0,255,
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| 53 | 255, 0,255,
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| 54 | 0,255,255,
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| 55 | 255,255,255,
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| 56 | };
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| 57 |
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| 58 | static GBMRGB gbmrgb_8[] =
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| 59 | {
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| 60 | 0, 0, 0,
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| 61 | 0, 0,255,
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| 62 | 0,255, 0,
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| 63 | 0,255,255,
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| 64 | 255, 0, 0,
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| 65 | 255, 0,255,
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| 66 | 255,255, 0,
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| 67 | 255,255,255,
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| 68 | 0, 0, 0,
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| 69 | 0, 0, 0,
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| 70 | 0, 0, 0,
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| 71 | 0, 0, 0,
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| 72 | 0, 0, 0,
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| 73 | 0, 0, 0,
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| 74 | 0, 0, 0,
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| 75 | 0, 0, 0,
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| 76 | };
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| 77 | /*...e*/
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| 78 | /*...sdivt:0:*/
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| 79 | /*
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| 80 | This fold encompasses a way to get rapid division via lookup tables.
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| 81 | */
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| 82 |
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| 83 | static word divt9[9 * 0x100];
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| 84 | static word divt7[9 * 0x100];
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| 85 | static word divt6[9 * 0x100];
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| 86 | static word divt5[9 * 0x100];
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| 87 | static word divt3[9 * 0x100];
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| 88 |
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| 89 | /*...smake_divt:0:*/
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| 90 | static void make_divt(word *divt, int size, int by)
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| 91 | {
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| 92 | int i;
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| 93 |
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| 94 | for ( i = 0; i < size; i++ )
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| 95 | divt[i] = (word) (i / by);
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| 96 | }
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| 97 | /*...e*/
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| 98 |
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| 99 | #define div9(w) divt9[w]
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| 100 | #define div8(w) ((w)>>3)
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| 101 | #define div7(w) divt7[w]
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| 102 | #define div6(w) divt6[w]
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| 103 | #define div5(w) divt5[w]
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| 104 | #define div4(w) ((w)>>2)
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| 105 | #define div3(w) divt3[w]
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| 106 | #define div2(w) ((w)>>1)
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| 107 | /*...e*/
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| 108 | /*...sinit:0:*/
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| 109 | /*
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| 110 | This function initialises this module.
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| 111 | */
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| 112 |
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| 113 | /*...stakeout_inx:0:*/
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| 114 | /*
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| 115 | For the supplied value, find the index of the highest value in the scale
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| 116 | less than or equal to the value.
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| 117 | */
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| 118 |
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| 119 | static byte takeout_inx(int value, const byte ab[], unsigned short cb)
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| 120 | {
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| 121 | byte inx = 0;
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| 122 | unsigned short i;
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| 123 |
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| 124 | for ( i = 0; i < cb; i++ )
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| 125 | if ( (unsigned short) ab[i] <= (unsigned short) value )
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| 126 | inx = (byte) i;
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| 127 |
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| 128 | return inx;
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| 129 | }
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| 130 | /*...e*/
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| 131 | /*...stakeout_inx_vga:0:*/
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| 132 | /*
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| 133 | The idea is to take as much of the r, g and b as possible by chosing a
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| 134 | colour from the VGA palette that leaves as little left over as possible.
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| 135 | Since there are 2 mid-greys, we discourage the use of one.
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| 136 | The only justification for this is that the results seem to come out better!
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| 137 | Also, I have tried allowing takefrom to return the closest index, allowing
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| 138 | more to be taken than r,g and b. This gives less grey results, but the
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| 139 | output is a lot dirtier and speckled.
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| 140 | */
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| 141 |
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| 142 | static byte takeout_inx_vga(word r, word g, word b)
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| 143 | {
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| 144 | byte inx;
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| 145 | byte inx_min = 0;
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| 146 | int e_min = (int) ( r + g + b );
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| 147 |
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| 148 | for ( inx = 1; inx < 16; inx++ )
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| 149 | if ( inx != 8 )
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| 150 | {
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| 151 | int re = (int) ( r - (word) gbmrgb_vga[inx].r );
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| 152 | int ge = (int) ( g - (word) gbmrgb_vga[inx].g );
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| 153 | int be = (int) ( b - (word) gbmrgb_vga[inx].b );
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| 154 |
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| 155 | if ( re >= 0 && ge >= 0 && be >= 0 )
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| 156 | {
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| 157 | int e = re + ge + be;
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| 158 |
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| 159 | if ( e < e_min )
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| 160 | {
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| 161 | e_min = e;
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| 162 | inx_min = inx;
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| 163 | }
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| 164 | }
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| 165 | }
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| 166 | return inx_min;
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| 167 | }
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| 168 | /*...e*/
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| 169 |
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| 170 | static void init(void)
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| 171 | {
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| 172 | static word val[] = { 0, 0x80, 0xff };
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| 173 | int i;
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| 174 | int volatile r; /* C-Set/2 optimiser fix */
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| 175 | int volatile g;
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| 176 | int volatile b;
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| 177 |
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| 178 | if ( inited )
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| 179 | return;
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| 180 |
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| 181 | /* For 7 Red x 8 Green x 4 Blue palettes etc. */
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| 182 |
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| 183 | for ( i = 0; i < 0x400; i++ )
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| 184 | {
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| 185 | index4[i] = takeout_inx(i, scale4 , sizeof(scale4));
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| 186 | index6[i] = takeout_inx(i, scale6 , sizeof(scale6));
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| 187 | index7[i] = takeout_inx(i, scale7 , sizeof(scale7));
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| 188 | index8[i] = takeout_inx(i, scale8 , sizeof(scale8));
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| 189 | }
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| 190 |
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| 191 | memset(map_to_012, 0, 0x80);
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| 192 | memset(map_to_012 + 0x80, 1, 0x7f);
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| 193 | memset(map_to_012 + 0xff, 2, 0x801);
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| 194 |
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| 195 | for ( r = 0; r < 3; r++ )
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| 196 | for ( g = 0; g < 3; g++ )
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| 197 | for ( b = 0; b < 3; b++ )
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| 198 | map_to_inx[r][g][b] = takeout_inx_vga(val[r], val[g], val[b]);
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| 199 |
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| 200 | make_divt(divt9, sizeof(divt9)/sizeof(word), 9);
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| 201 | make_divt(divt7, sizeof(divt7)/sizeof(word), 7);
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| 202 | make_divt(divt6, sizeof(divt6)/sizeof(word), 6);
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| 203 | make_divt(divt5, sizeof(divt5)/sizeof(word), 5);
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| 204 | make_divt(divt3, sizeof(divt3)/sizeof(word), 3);
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| 205 |
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| 206 | inited = TRUE;
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| 207 | }
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| 208 | /*...e*/
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| 209 | /*...stakefrom:0:*/
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| 210 | #define takefrom(r,g,b) ( map_to_inx[map_to_012[r]][map_to_012[g]][map_to_012[b]] )
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| 211 | /*...e*/
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| 212 | /*...ssplit_into:0:*/
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| 213 | /* n is only ever 2, 3, 4, 6 or 9 */
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| 214 |
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| 215 | static void split_into(
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| 216 | word r, word g, word b,
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| 217 | int n, byte *inxs
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| 218 | )
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| 219 | {
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| 220 | byte inx;
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| 221 |
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| 222 | if ( n >= 9 )
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| 223 | {
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| 224 | inx = takefrom(div9(r), div9(g), div9(b));
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| 225 | b -= gbmrgb_vga[inx].b;
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| 226 | g -= gbmrgb_vga[inx].g;
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| 227 | r -= gbmrgb_vga[inx].r;
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| 228 | *inxs++ = inx;
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| 229 |
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| 230 | inx = takefrom(div8(r), div8(g), div8(b));
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| 231 | b -= gbmrgb_vga[inx].b;
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| 232 | g -= gbmrgb_vga[inx].g;
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| 233 | r -= gbmrgb_vga[inx].r;
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| 234 | *inxs++ = inx;
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| 235 |
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| 236 | inx = takefrom(div7(r), div7(g), div7(b));
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| 237 | b -= gbmrgb_vga[inx].b;
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| 238 | g -= gbmrgb_vga[inx].g;
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| 239 | r -= gbmrgb_vga[inx].r;
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| 240 | *inxs++ = inx;
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| 241 | }
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| 242 |
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| 243 | if ( n >= 6 )
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| 244 | {
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| 245 | inx = takefrom(div6(r), div6(g), div6(b));
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| 246 | b -= gbmrgb_vga[inx].b;
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| 247 | g -= gbmrgb_vga[inx].g;
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| 248 | r -= gbmrgb_vga[inx].r;
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| 249 | *inxs++ = inx;
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| 250 |
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| 251 | inx = takefrom(div5(r), div5(g), div5(b));
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| 252 | b -= gbmrgb_vga[inx].b;
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| 253 | g -= gbmrgb_vga[inx].g;
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| 254 | r -= gbmrgb_vga[inx].r;
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| 255 | *inxs++ = inx;
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| 256 | }
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| 257 |
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| 258 | if ( n >= 4 )
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| 259 | {
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| 260 | inx = takefrom(div4(r), div4(g), div4(b));
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| 261 | b -= gbmrgb_vga[inx].b;
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| 262 | g -= gbmrgb_vga[inx].g;
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| 263 | r -= gbmrgb_vga[inx].r;
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| 264 | *inxs++ = inx;
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| 265 | }
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| 266 |
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| 267 | if ( n >= 3 )
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| 268 | {
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| 269 | inx = takefrom(div3(r), div3(g), div3(b));
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| 270 | b -= gbmrgb_vga[inx].b;
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| 271 | g -= gbmrgb_vga[inx].g;
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| 272 | r -= gbmrgb_vga[inx].r;
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| 273 | *inxs++ = inx;
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| 274 | }
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| 275 |
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| 276 | inx = takefrom(div2(r), div2(g), div2(b));
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| 277 | b -= gbmrgb_vga[inx].b;
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| 278 | g -= gbmrgb_vga[inx].g;
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| 279 | r -= gbmrgb_vga[inx].r;
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| 280 | *inxs++ = inx;
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| 281 |
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| 282 | *inxs = takefrom(r, g, b);
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| 283 | }
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| 284 | /*...e*/
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| 285 | /*...stakefrom8:0:*/
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| 286 | /*
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| 287 | Find the largest colour from the 8 colour palette.
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| 288 | */
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| 289 |
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| 290 | #define takefrom8(r,g,b) ( (((r)>=255)<<2) | (((g)>=255)<<1) | ((b)>=255) )
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| 291 | /*...e*/
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| 292 | /*...ssplit_into8:0:*/
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| 293 | /* n is only ever 2, 3, 4, 6 or 9 */
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| 294 |
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| 295 | static void split_into8(
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| 296 | word r, word g, word b,
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| 297 | int n, byte *inxs
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| 298 | )
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| 299 | {
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| 300 | byte inx;
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| 301 |
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| 302 | if ( n >= 9 )
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| 303 | {
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| 304 | inx = takefrom8(div9(r), div9(g), div9(b));
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| 305 | b -= gbmrgb_8[inx].b;
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| 306 | g -= gbmrgb_8[inx].g;
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| 307 | r -= gbmrgb_8[inx].r;
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| 308 | *inxs++ = inx;
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| 309 |
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| 310 | inx = takefrom8(div8(r), div8(g), div8(b));
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| 311 | b -= gbmrgb_8[inx].b;
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| 312 | g -= gbmrgb_8[inx].g;
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| 313 | r -= gbmrgb_8[inx].r;
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| 314 | *inxs++ = inx;
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| 315 |
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| 316 | inx = takefrom8(div7(r), div7(g), div7(b));
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| 317 | b -= gbmrgb_8[inx].b;
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| 318 | g -= gbmrgb_8[inx].g;
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| 319 | r -= gbmrgb_8[inx].r;
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| 320 | *inxs++ = inx;
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| 321 | }
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| 322 |
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| 323 | if ( n >= 6 )
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| 324 | {
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| 325 | inx = takefrom8(div6(r), div6(g), div6(b));
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| 326 | b -= gbmrgb_8[inx].b;
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| 327 | g -= gbmrgb_8[inx].g;
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| 328 | r -= gbmrgb_8[inx].r;
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| 329 | *inxs++ = inx;
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| 330 |
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| 331 | inx = takefrom8(div5(r), div5(g), div5(b));
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| 332 | b -= gbmrgb_8[inx].b;
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| 333 | g -= gbmrgb_8[inx].g;
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| 334 | r -= gbmrgb_8[inx].r;
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| 335 | *inxs++ = inx;
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| 336 | }
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| 337 |
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| 338 | if ( n >= 4 )
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| 339 | {
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| 340 | inx = takefrom8(div4(r), div4(g), div4(b));
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| 341 | b -= gbmrgb_8[inx].b;
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| 342 | g -= gbmrgb_8[inx].g;
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| 343 | r -= gbmrgb_8[inx].r;
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| 344 | *inxs++ = inx;
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| 345 | }
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| 346 |
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| 347 | if ( n >= 3 )
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| 348 | {
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| 349 | inx = takefrom8(div3(r), div3(g), div3(b));
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| 350 | b -= gbmrgb_8[inx].b;
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| 351 | g -= gbmrgb_8[inx].g;
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| 352 | r -= gbmrgb_8[inx].r;
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| 353 | *inxs++ = inx;
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| 354 | }
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| 355 |
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| 356 | inx = takefrom8(div2(r), div2(g), div2(b));
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| 357 | b -= gbmrgb_8[inx].b;
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| 358 | g -= gbmrgb_8[inx].g;
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| 359 | r -= gbmrgb_8[inx].r;
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| 360 | *inxs++ = inx;
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| 361 |
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| 362 | *inxs = takefrom8(r, g, b);
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| 363 | }
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| 364 | /*...e*/
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| 365 |
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| 366 | /*...sgbm_ht_24_2x2 \45\ halftone by 2x2 to r\58\g\58\b bits:0:*/
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| 367 | void gbm_ht_24_2x2(const GBM *gbm, const byte *src24, byte *dest24, byte rm, byte gm, byte bm)
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| 368 | {
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| 369 | int stride = ((gbm->w * 3 + 3) & ~3);
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| 370 | int x, y;
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| 371 |
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| 372 | init();
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| 373 |
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| 374 | src24 -= stride;
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| 375 | dest24 -= stride;
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| 376 |
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| 377 | for ( y = 0; y < gbm->h - 1; y += 2 )
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| 378 | {
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| 379 | const byte *src24a = (src24 += stride);
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| 380 | const byte *src24b = (src24 += stride);
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| 381 | byte *dest24a = (dest24 += stride);
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| 382 | byte *dest24b = (dest24 += stride);
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| 383 |
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| 384 | for ( x = 0; x < gbm->w - 1; x += 2 )
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| 385 | /*...s2x2 case:24:*/
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| 386 | {
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| 387 | word r,g,b;
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| 388 | byte ri,gi,bi;
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| 389 | byte *tmp;
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| 390 |
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| 391 | b = *src24a++; g = *src24a++; r = *src24a++;
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| 392 | b += *src24a++; g += *src24a++; r += *src24a++;
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| 393 | b += *src24b++; g += *src24b++; r += *src24b++;
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| 394 | b += *src24b++; g += *src24b++; r += *src24b++;
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| 395 |
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| 396 | bi = (div4(b) & bm); gi = (div4(g) & gm); ri = (div4(r) & rm);
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| 397 | *dest24a++ = bi; *dest24a++ = gi; *dest24a++ = ri;
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| 398 | b -= bi; g -= gi; r -= ri;
|
|---|
| 399 |
|
|---|
| 400 | if ( b > 255 * 3 ) b = 255 * 3;
|
|---|
| 401 | if ( g > 255 * 3 ) g = 255 * 3;
|
|---|
| 402 | if ( r > 255 * 3 ) r = 255 * 3;
|
|---|
| 403 |
|
|---|
| 404 | bi = (div3(b) & bm); gi = (div3(g) & gm); ri = (div3(r) & rm);
|
|---|
| 405 | *dest24a++ = bi; *dest24a++ = gi; *dest24a++ = ri;
|
|---|
| 406 | b -= bi; g -= gi; r -= ri;
|
|---|
| 407 |
|
|---|
| 408 | if ( b > 255 * 2 ) b = 255 * 2;
|
|---|
| 409 | if ( g > 255 * 2 ) g = 255 * 2;
|
|---|
| 410 | if ( r > 255 * 2 ) r = 255 * 2;
|
|---|
| 411 |
|
|---|
| 412 | bi = (div2(b) & bm); gi = (div2(g) & gm); ri = (div2(r) & rm);
|
|---|
| 413 | *dest24b++ = bi; *dest24b++ = gi; *dest24b++ = ri;
|
|---|
| 414 | b -= bi; g -= gi; r -= ri;
|
|---|
| 415 |
|
|---|
| 416 | if ( b > 255 ) b = 255;
|
|---|
| 417 | if ( g > 255 ) g = 255;
|
|---|
| 418 | if ( r > 255 ) r = 255;
|
|---|
| 419 |
|
|---|
| 420 | bi = (b & bm); gi = (g & gm); ri = (r & rm);
|
|---|
| 421 | *dest24b++ = bi; *dest24b++ = gi; *dest24b++ = ri;
|
|---|
| 422 |
|
|---|
| 423 | tmp = dest24a; dest24a = dest24b; dest24b = tmp;
|
|---|
| 424 | }
|
|---|
| 425 | /*...e*/
|
|---|
| 426 | if ( x < gbm->w )
|
|---|
| 427 | /*...s1x2 case:24:*/
|
|---|
| 428 | {
|
|---|
| 429 | word r,g,b;
|
|---|
| 430 | byte ri, gi, bi;
|
|---|
| 431 |
|
|---|
| 432 | b = *src24a++; g = *src24a++; r = *src24a;
|
|---|
| 433 | b += *src24b++; g += *src24b++; r += *src24b;
|
|---|
| 434 |
|
|---|
| 435 | bi = (div2(b) & bm); gi = (div2(g) & gm); ri = (div2(r) & rm);
|
|---|
| 436 | *dest24a++ = bi; *dest24a++ = gi; *dest24a++ = ri;
|
|---|
| 437 | b -= bi; g -= gi; r -= ri;
|
|---|
| 438 |
|
|---|
| 439 | if ( b > 255 ) b = 255;
|
|---|
| 440 | if ( g > 255 ) g = 255;
|
|---|
| 441 | if ( r > 255 ) r = 255;
|
|---|
| 442 |
|
|---|
| 443 | bi = (b & bm); gi = (g & gm); ri = (r & rm);
|
|---|
| 444 | *dest24b++ = bi; *dest24b++ = gi; *dest24b = ri;
|
|---|
| 445 | }
|
|---|
| 446 | /*...e*/
|
|---|
| 447 | }
|
|---|
| 448 | if ( y < gbm->h )
|
|---|
| 449 | {
|
|---|
| 450 | const byte *src24a = src24 + stride;
|
|---|
| 451 | byte *dest24a = dest24 + stride;
|
|---|
| 452 |
|
|---|
| 453 | for ( x = 0; x < gbm->w - 1; x += 2 )
|
|---|
| 454 | /*...s2x1 case:24:*/
|
|---|
| 455 | {
|
|---|
| 456 | word r,g,b;
|
|---|
| 457 | byte ri, gi, bi;
|
|---|
| 458 |
|
|---|
| 459 | b = *src24a++; g = *src24a++; r = *src24a++;
|
|---|
| 460 | b += *src24a++; g += *src24a++; r += *src24a++;
|
|---|
| 461 |
|
|---|
| 462 | bi = (div2(b) & bm); gi = (div2(g) & gm); ri = (div2(r) & rm);
|
|---|
| 463 | *dest24a++ = bi; *dest24a++ = gi; *dest24a++ = ri;
|
|---|
| 464 | b -= bi; g -= gi; r -= ri;
|
|---|
| 465 |
|
|---|
| 466 | if ( b > 255 ) b = 255;
|
|---|
| 467 | if ( g > 255 ) g = 255;
|
|---|
| 468 | if ( r > 255 ) r = 255;
|
|---|
| 469 |
|
|---|
| 470 | bi = (b & bm); gi = (g & gm); ri = (r & rm);
|
|---|
| 471 | *dest24a++ = bi; *dest24a++ = gi; *dest24a++ = ri;
|
|---|
| 472 | }
|
|---|
| 473 | /*...e*/
|
|---|
| 474 | if ( x < gbm->w )
|
|---|
| 475 | /*...s1x1 case:24:*/
|
|---|
| 476 | {
|
|---|
| 477 | byte ri, gi, bi;
|
|---|
| 478 |
|
|---|
| 479 | bi = ((*src24a++) & bm); gi = ((*src24a++) & gm); ri = ((*src24a) & rm);
|
|---|
| 480 | *dest24a++ = bi; *dest24a++ = gi; *dest24a = ri;
|
|---|
| 481 | }
|
|---|
| 482 | /*...e*/
|
|---|
| 483 | }
|
|---|
| 484 | }
|
|---|
| 485 | /*...e*/
|
|---|
| 486 |
|
|---|
| 487 | /*...sgbm_ht_pal_6R6G6B \45\ return 6Rx6Gx6B palette:0:*/
|
|---|
| 488 | /*
|
|---|
| 489 | This function makes the palette for the 6 red x 6 green x 6 blue palette.
|
|---|
| 490 | 216 palette entrys used. Remaining 40 left blank.
|
|---|
| 491 | */
|
|---|
| 492 |
|
|---|
| 493 | void gbm_ht_pal_6R6G6B(GBMRGB *gbmrgb)
|
|---|
| 494 | {
|
|---|
| 495 | byte volatile r; /* C-Set/2 optimiser fix */
|
|---|
| 496 | byte volatile g;
|
|---|
| 497 | byte volatile b;
|
|---|
| 498 |
|
|---|
| 499 | init();
|
|---|
| 500 | memset(gbmrgb, 0x80, 0x100 * sizeof(GBMRGB));
|
|---|
| 501 | for ( r = 0; r < 6; r++ )
|
|---|
| 502 | for ( g = 0; g < 6; g++ )
|
|---|
| 503 | for ( b = 0; b < 6; b++ )
|
|---|
| 504 | {
|
|---|
| 505 | gbmrgb->r = scale6[r];
|
|---|
| 506 | gbmrgb->g = scale6[g];
|
|---|
| 507 | gbmrgb->b = scale6[b];
|
|---|
| 508 | gbmrgb++;
|
|---|
| 509 | }
|
|---|
| 510 | }
|
|---|
| 511 | /*...e*/
|
|---|
| 512 | /*...sgbm_ht_6R6G6B_2x2 \45\ halftone by 2x2 to 6Rx6Gx6B palette:0:*/
|
|---|
| 513 | #define PIX666(ri,gi,bi) (byte) (6 * (6 * ri + gi) + bi)
|
|---|
| 514 |
|
|---|
| 515 | void gbm_ht_6R6G6B_2x2(const GBM *gbm, const byte *src24, byte *dest8)
|
|---|
| 516 | {
|
|---|
| 517 | int stride24 = ((gbm->w * 3 + 3) & ~3);
|
|---|
| 518 | int stride8 = ((gbm->w + 3) & ~3);
|
|---|
| 519 | int x, y;
|
|---|
| 520 |
|
|---|
| 521 | init();
|
|---|
| 522 |
|
|---|
| 523 | src24 -= stride24;
|
|---|
| 524 | dest8 -= stride8;
|
|---|
| 525 |
|
|---|
| 526 | for ( y = 0; y < gbm->h - 1; y += 2 )
|
|---|
| 527 | {
|
|---|
| 528 | const byte *src24a = (src24 += stride24);
|
|---|
| 529 | const byte *src24b = (src24 += stride24);
|
|---|
| 530 | byte *dest8a = (dest8 += stride8);
|
|---|
| 531 | byte *dest8b = (dest8 += stride8);
|
|---|
| 532 |
|
|---|
| 533 | for ( x = 0; x < gbm->w - 1; x += 2 )
|
|---|
| 534 | /*...s2x2 case:24:*/
|
|---|
| 535 | {
|
|---|
| 536 | word r,g,b;
|
|---|
| 537 | byte ri,gi,bi;
|
|---|
| 538 | byte *tmp;
|
|---|
| 539 |
|
|---|
| 540 | b = *src24a++; g = *src24a++; r = *src24a++;
|
|---|
| 541 | b += *src24a++; g += *src24a++; r += *src24a++;
|
|---|
| 542 | b += *src24b++; g += *src24b++; r += *src24b++;
|
|---|
| 543 | b += *src24b++; g += *src24b++; r += *src24b++;
|
|---|
| 544 |
|
|---|
| 545 | bi = index6[div4(b)]; gi = index6[div4(g)]; ri = index6[div4(r)];
|
|---|
| 546 | *dest8a++ = PIX666(ri,gi,bi);
|
|---|
| 547 | b -= scale6[bi]; g -= scale6[gi]; r -= scale6[ri];
|
|---|
| 548 |
|
|---|
| 549 | bi = index6[div3(b)]; gi = index6[div3(g)]; ri = index6[div3(r)];
|
|---|
| 550 | *dest8a++ = PIX666(ri,gi,bi);
|
|---|
| 551 | b -= scale6[bi]; g -= scale6[gi]; r -= scale6[ri];
|
|---|
| 552 |
|
|---|
| 553 | bi = index6[div2(b)]; gi = index6[div2(g)]; ri = index6[div2(r)];
|
|---|
| 554 | *dest8b++ = PIX666(ri,gi,bi);
|
|---|
| 555 | b -= scale6[bi]; g -= scale6[gi]; r -= scale6[ri];
|
|---|
| 556 |
|
|---|
| 557 | bi = index6[b ]; gi = index6[g ]; ri = index6[r ];
|
|---|
| 558 | *dest8b++ = PIX666(ri,gi,bi);
|
|---|
| 559 |
|
|---|
| 560 | tmp = dest8a; dest8a = dest8b; dest8b = tmp;
|
|---|
| 561 | }
|
|---|
| 562 | /*...e*/
|
|---|
| 563 | if ( x < gbm->w )
|
|---|
| 564 | /*...s1x2 case:24:*/
|
|---|
| 565 | {
|
|---|
| 566 | word r,g,b;
|
|---|
| 567 | byte ri, gi, bi;
|
|---|
| 568 |
|
|---|
| 569 | b = *src24a++; g = *src24a++; r = *src24a;
|
|---|
| 570 | b += *src24b++; g += *src24b++; r += *src24b;
|
|---|
| 571 |
|
|---|
| 572 | bi = index6[div2(b)]; gi = index6[div2(g)]; ri = index6[div2(r)];
|
|---|
| 573 | *dest8a = PIX666(ri,gi,bi);
|
|---|
| 574 | b -= scale6[bi]; g -= scale6[gi]; r -= scale6[ri];
|
|---|
| 575 |
|
|---|
| 576 | bi = index6[b ]; gi = index6[g ]; ri = index6[r ];
|
|---|
| 577 | *dest8b = PIX666(ri,gi,bi);
|
|---|
| 578 | }
|
|---|
| 579 | /*...e*/
|
|---|
| 580 | }
|
|---|
| 581 | if ( y < gbm->h )
|
|---|
| 582 | {
|
|---|
| 583 | const byte *src24a = src24 + stride24;
|
|---|
| 584 | byte *dest8a = dest8 + stride8;
|
|---|
| 585 |
|
|---|
| 586 | for ( x = 0; x < gbm->w - 1; x += 2 )
|
|---|
| 587 | /*...s2x1 case:24:*/
|
|---|
| 588 | {
|
|---|
| 589 | word r,g,b;
|
|---|
| 590 | byte ri, gi, bi;
|
|---|
| 591 |
|
|---|
| 592 | b = *src24a++; g = *src24a++; r = *src24a++;
|
|---|
| 593 | b += *src24a++; g += *src24a++; r += *src24a++;
|
|---|
| 594 |
|
|---|
| 595 | bi = index6[div2(b)]; gi = index6[div2(g)]; ri = index6[div2(r)];
|
|---|
| 596 | *dest8a++ = PIX666(ri,gi,bi);
|
|---|
| 597 | b -= scale6[bi]; g -= scale6[gi]; r -= scale6[ri];
|
|---|
| 598 |
|
|---|
| 599 | bi = index6[b ]; gi = index6[g ]; ri = index6[r ];
|
|---|
| 600 | *dest8a++ = PIX666(ri,gi,bi);
|
|---|
| 601 | }
|
|---|
| 602 | /*...e*/
|
|---|
| 603 | if ( x < gbm->w )
|
|---|
| 604 | /*...s1x1 case:24:*/
|
|---|
| 605 | {
|
|---|
| 606 | byte ri, gi, bi;
|
|---|
| 607 |
|
|---|
| 608 | bi = index6[*src24a++]; gi = index6[*src24a++]; ri = index6[*src24a];
|
|---|
| 609 | *dest8a = PIX666(ri,gi,bi);
|
|---|
| 610 | }
|
|---|
| 611 | /*...e*/
|
|---|
| 612 | }
|
|---|
| 613 | }
|
|---|
| 614 | /*...e*/
|
|---|
| 615 |
|
|---|
| 616 | /*...sgbm_ht_pal_7R8G4B \45\ return 7Rx8Gx4B palette:0:*/
|
|---|
| 617 | /*
|
|---|
| 618 | This function makes the palette for the 7 red x 8 green x 4 blue palette.
|
|---|
| 619 | 224 palette entrys used. Remaining 32 left blank.
|
|---|
| 620 | Colours calculated to match those used by 8514/A PM driver.
|
|---|
| 621 | */
|
|---|
| 622 |
|
|---|
| 623 | void gbm_ht_pal_7R8G4B(GBMRGB *gbmrgb)
|
|---|
| 624 | {
|
|---|
| 625 | byte volatile r; /* C-Set/2 optimiser fix */
|
|---|
| 626 | byte volatile g;
|
|---|
| 627 | byte volatile b;
|
|---|
| 628 |
|
|---|
| 629 | init();
|
|---|
| 630 |
|
|---|
| 631 | memset(gbmrgb, 0x80, 0x100 * sizeof(GBMRGB));
|
|---|
| 632 | for ( r = 0; r < 7; r++ )
|
|---|
| 633 | for ( g = 0; g < 8; g++ )
|
|---|
| 634 | for ( b = 0; b < 4; b++ )
|
|---|
| 635 | {
|
|---|
| 636 | gbmrgb->r = scale7[r];
|
|---|
| 637 | gbmrgb->g = scale8[g];
|
|---|
| 638 | gbmrgb->b = scale4[b];
|
|---|
| 639 | gbmrgb++;
|
|---|
| 640 | }
|
|---|
| 641 | }
|
|---|
| 642 | /*...e*/
|
|---|
| 643 | /*...sgbm_ht_7R8G4B_2x2 \45\ halftone by 2x2 to 7Rx8Gx4B palette:0:*/
|
|---|
| 644 | #define PIX784(ri,gi,bi) (byte) (((((ri)<<3)+(gi))<<2)+(bi))
|
|---|
| 645 |
|
|---|
| 646 | void gbm_ht_7R8G4B_2x2(const GBM *gbm, const byte *src24, byte *dest8)
|
|---|
| 647 | {
|
|---|
| 648 | int stride24 = ((gbm->w * 3 + 3) & ~3);
|
|---|
| 649 | int stride8 = ((gbm->w + 3) & ~3);
|
|---|
| 650 | int x, y;
|
|---|
| 651 |
|
|---|
| 652 | init();
|
|---|
| 653 |
|
|---|
| 654 | src24 -= stride24;
|
|---|
| 655 | dest8 -= stride8;
|
|---|
| 656 |
|
|---|
| 657 | for ( y = 0; y < gbm->h - 1; y += 2 )
|
|---|
| 658 | {
|
|---|
| 659 | const byte *src24a = (src24 += stride24);
|
|---|
| 660 | const byte *src24b = (src24 += stride24);
|
|---|
| 661 | byte *dest8a = (dest8 += stride8);
|
|---|
| 662 | byte *dest8b = (dest8 += stride8);
|
|---|
| 663 |
|
|---|
| 664 | for ( x = 0; x < gbm->w - 1; x += 2 )
|
|---|
| 665 | /*...s2x2 case:24:*/
|
|---|
| 666 | {
|
|---|
| 667 | word r,g,b;
|
|---|
| 668 | byte ri,gi,bi;
|
|---|
| 669 | byte *tmp;
|
|---|
| 670 |
|
|---|
| 671 | b = *src24a++; g = *src24a++; r = *src24a++;
|
|---|
| 672 | b += *src24a++; g += *src24a++; r += *src24a++;
|
|---|
| 673 | b += *src24b++; g += *src24b++; r += *src24b++;
|
|---|
| 674 | b += *src24b++; g += *src24b++; r += *src24b++;
|
|---|
| 675 |
|
|---|
| 676 | bi = index4[div4(b)]; gi = index8[div4(g)]; ri = index7[div4(r)];
|
|---|
| 677 | *dest8a++ = PIX784(ri,gi,bi);
|
|---|
| 678 | b -= scale4[bi]; g -= scale8[gi]; r -= scale7[ri];
|
|---|
| 679 |
|
|---|
| 680 | bi = index4[div3(b)]; gi = index8[div3(g)]; ri = index7[div3(r)];
|
|---|
| 681 | *dest8a++ = PIX784(ri,gi,bi);
|
|---|
| 682 | b -= scale4[bi]; g -= scale8[gi]; r -= scale7[ri];
|
|---|
| 683 |
|
|---|
| 684 | bi = index4[div2(b)]; gi = index8[div2(g)]; ri = index7[div2(r)];
|
|---|
| 685 | *dest8b++ = PIX784(ri,gi,bi);
|
|---|
| 686 | b -= scale4[bi]; g -= scale8[gi]; r -= scale7[ri];
|
|---|
| 687 |
|
|---|
| 688 | bi = index4[b ]; gi = index8[g ]; ri = index7[r ];
|
|---|
| 689 | *dest8b++ = PIX784(ri,gi,bi);
|
|---|
| 690 |
|
|---|
| 691 | tmp = dest8a; dest8a = dest8b; dest8b = tmp;
|
|---|
| 692 | }
|
|---|
| 693 | /*...e*/
|
|---|
| 694 | if ( x < gbm->w )
|
|---|
| 695 | /*...s1x2 case:24:*/
|
|---|
| 696 | {
|
|---|
| 697 | word r,g,b;
|
|---|
| 698 | byte ri, gi, bi;
|
|---|
| 699 |
|
|---|
| 700 | b = *src24a++; g = *src24a++; r = *src24a;
|
|---|
| 701 | b += *src24b++; g += *src24b++; r += *src24b;
|
|---|
| 702 |
|
|---|
| 703 | bi = index4[div2(b)]; gi = index8[div2(g)]; ri = index7[div2(r)];
|
|---|
| 704 | *dest8a = PIX784(ri,gi,bi);
|
|---|
| 705 | b -= scale4[bi]; g -= scale8[gi]; r -= scale7[ri];
|
|---|
| 706 |
|
|---|
| 707 | bi = index4[b ]; gi = index8[g ]; ri = index7[r ];
|
|---|
| 708 | *dest8b = PIX784(ri,gi,bi);
|
|---|
| 709 | }
|
|---|
| 710 | /*...e*/
|
|---|
| 711 | }
|
|---|
| 712 | if ( y < gbm->h )
|
|---|
| 713 | {
|
|---|
| 714 | const byte *src24a = src24 + stride24;
|
|---|
| 715 | byte *dest8a = dest8 + stride8;
|
|---|
| 716 |
|
|---|
| 717 | for ( x = 0; x < gbm->w - 1; x += 2 )
|
|---|
| 718 | /*...s2x1 case:24:*/
|
|---|
| 719 | {
|
|---|
| 720 | word r,g,b;
|
|---|
| 721 | byte ri, gi, bi;
|
|---|
| 722 |
|
|---|
| 723 | b = *src24a++; g = *src24a++; r = *src24a++;
|
|---|
| 724 | b += *src24a++; g += *src24a++; r += *src24a++;
|
|---|
| 725 |
|
|---|
| 726 | bi = index4[div2(b)]; gi = index8[div2(g)]; ri = index7[div2(r)];
|
|---|
| 727 | *dest8a++ = PIX784(ri,gi,bi);
|
|---|
| 728 | b -= scale4[bi]; g -= scale8[gi]; r -= scale7[ri];
|
|---|
| 729 |
|
|---|
| 730 | bi = index4[b ]; gi = index8[g ]; ri = index7[r ];
|
|---|
| 731 | *dest8a++ = PIX784(ri,gi,bi);
|
|---|
| 732 | }
|
|---|
| 733 | /*...e*/
|
|---|
| 734 | if ( x < gbm->w )
|
|---|
| 735 | /*...s1x1 case:24:*/
|
|---|
| 736 | {
|
|---|
| 737 | byte ri, gi, bi;
|
|---|
| 738 |
|
|---|
| 739 | bi = index4[*src24a++]; gi = index8[*src24a++]; ri = index7[*src24a];
|
|---|
| 740 | *dest8a = PIX784(ri,gi,bi);
|
|---|
| 741 | }
|
|---|
| 742 | /*...e*/
|
|---|
| 743 | }
|
|---|
| 744 | }
|
|---|
| 745 | /*...e*/
|
|---|
| 746 |
|
|---|
| 747 | /*...sgbm_ht_pal_VGA \45\ return default VGA palette:0:*/
|
|---|
| 748 | /*
|
|---|
| 749 | This function makes the palette for the 16 colour VGA palette.
|
|---|
| 750 | */
|
|---|
| 751 |
|
|---|
| 752 | void gbm_ht_pal_VGA(GBMRGB *gbmrgb)
|
|---|
| 753 | {
|
|---|
| 754 | init();
|
|---|
| 755 | memcpy((char *) gbmrgb, (char *) gbmrgb_vga, sizeof(gbmrgb_vga));
|
|---|
| 756 | }
|
|---|
| 757 | /*...e*/
|
|---|
| 758 | /*...sgbm_ht_VGA_2x2 \45\ halftone by 2x2 to default VGA palette:0:*/
|
|---|
| 759 | void gbm_ht_VGA_2x2(const GBM *gbm, const byte *src24, byte *dest4)
|
|---|
| 760 | {
|
|---|
| 761 | int stride24 = ((gbm->w * 3 + 3) & ~3);
|
|---|
| 762 | int stride4 = ((gbm->w * 4 + 31) / 32) * 4;
|
|---|
| 763 | int x, y;
|
|---|
| 764 |
|
|---|
| 765 | init();
|
|---|
| 766 |
|
|---|
| 767 | src24 -= stride24;
|
|---|
| 768 | dest4 -= stride4;
|
|---|
| 769 |
|
|---|
| 770 | for ( y = 0; y < gbm->h - 1; y += 2 )
|
|---|
| 771 | {
|
|---|
| 772 | const byte *src24a = (src24 += stride24);
|
|---|
| 773 | const byte *src24b = (src24 += stride24);
|
|---|
| 774 | byte *dest4a = (dest4 += stride4);
|
|---|
| 775 | byte *dest4b = (dest4 += stride4);
|
|---|
| 776 |
|
|---|
| 777 | for ( x = 0; x < gbm->w - 1; x += 2 )
|
|---|
| 778 | /*...s2x2 case:24:*/
|
|---|
| 779 | {
|
|---|
| 780 | word r,g,b;
|
|---|
| 781 | byte inx;
|
|---|
| 782 | byte *tmp;
|
|---|
| 783 |
|
|---|
| 784 | b = *src24a++; g = *src24a++; r = *src24a++;
|
|---|
| 785 | b += *src24a++; g += *src24a++; r += *src24a++;
|
|---|
| 786 | b += *src24b++; g += *src24b++; r += *src24b++;
|
|---|
| 787 | b += *src24b++; g += *src24b++; r += *src24b++;
|
|---|
| 788 |
|
|---|
| 789 | inx = takefrom(div4(r), div4(g), div4(b)); *dest4a = (inx << 4);
|
|---|
| 790 | b -= gbmrgb_vga[inx].b; g -= gbmrgb_vga[inx].g; r -= gbmrgb_vga[inx].r;
|
|---|
| 791 |
|
|---|
| 792 | inx = takefrom(div3(r), div3(g), div3(b)); *dest4a++ |= inx;
|
|---|
| 793 | b -= gbmrgb_vga[inx].b; g -= gbmrgb_vga[inx].g; r -= gbmrgb_vga[inx].r;
|
|---|
| 794 |
|
|---|
| 795 | inx = takefrom(div2(r), div2(g), div2(b)); *dest4b = (inx << 4);
|
|---|
| 796 | b -= gbmrgb_vga[inx].b; g -= gbmrgb_vga[inx].g; r -= gbmrgb_vga[inx].r;
|
|---|
| 797 |
|
|---|
| 798 | inx = takefrom(r , g , b ); *dest4b++ |= inx;
|
|---|
| 799 |
|
|---|
| 800 | tmp = dest4a; dest4a = dest4b; dest4b = tmp;
|
|---|
| 801 | }
|
|---|
| 802 | /*...e*/
|
|---|
| 803 | if ( x < gbm->w )
|
|---|
| 804 | /*...s1x2 case:24:*/
|
|---|
| 805 | {
|
|---|
| 806 | word r,g,b;
|
|---|
| 807 | byte inx;
|
|---|
| 808 |
|
|---|
| 809 | b = *src24a++; g = *src24a++; r = *src24a;
|
|---|
| 810 | b += *src24b++; g += *src24b++; r += *src24b;
|
|---|
| 811 |
|
|---|
| 812 | inx = takefrom(div2(r), div2(g), div2(b)); *dest4a = (inx << 4);
|
|---|
| 813 | b -= gbmrgb_vga[inx].b; g -= gbmrgb_vga[inx].g; r -= gbmrgb_vga[inx].r;
|
|---|
| 814 |
|
|---|
| 815 | inx = takefrom(r , g , b ); *dest4b = (inx << 4);
|
|---|
| 816 | }
|
|---|
| 817 | /*...e*/
|
|---|
| 818 | }
|
|---|
| 819 | if ( y < gbm->h )
|
|---|
| 820 | {
|
|---|
| 821 | const byte *src24a = src24 + stride24;
|
|---|
| 822 | byte *dest4a = dest4 + stride4;
|
|---|
| 823 |
|
|---|
| 824 | for ( x = 0; x < gbm->w - 1; x += 2 )
|
|---|
| 825 | /*...s2x1 case:24:*/
|
|---|
| 826 | {
|
|---|
| 827 | word r,g,b;
|
|---|
| 828 | byte inx;
|
|---|
| 829 |
|
|---|
| 830 | b = *src24a++; g = *src24a++; r = *src24a++;
|
|---|
| 831 | b += *src24a++; g += *src24a++; r += *src24a++;
|
|---|
| 832 |
|
|---|
| 833 | inx = takefrom(div2(r), div2(g), div2(b)); *dest4a = (inx << 4);
|
|---|
| 834 | b -= gbmrgb_vga[inx].b; g -= gbmrgb_vga[inx].g; r -= gbmrgb_vga[inx].r;
|
|---|
| 835 |
|
|---|
| 836 | inx = takefrom(r , g , b ); *dest4a++ |= inx;
|
|---|
| 837 | }
|
|---|
| 838 | /*...e*/
|
|---|
| 839 | if ( x < gbm->w )
|
|---|
| 840 | /*...s1x1 case:24:*/
|
|---|
| 841 | {
|
|---|
| 842 | word r, g, b;
|
|---|
| 843 | byte inx;
|
|---|
| 844 |
|
|---|
| 845 | b = *src24a++; g = *src24a++; r = *src24a;
|
|---|
| 846 | inx = takefrom(r, g, b); *dest4a = (inx << 4);
|
|---|
| 847 | }
|
|---|
| 848 | /*...e*/
|
|---|
| 849 | }
|
|---|
| 850 | }
|
|---|
| 851 | /*...e*/
|
|---|
| 852 | /*...sgbm_ht_VGA_3x3 \45\ halftone by 3x3 to default VGA palette:0:*/
|
|---|
| 853 | void gbm_ht_VGA_3x3(const GBM *gbm, const byte *src24, byte *dest4)
|
|---|
| 854 | {
|
|---|
| 855 | int stride24 = ((gbm->w * 3 + 3) & ~3);
|
|---|
| 856 | int stride4 = ((gbm->w * 4 + 31) / 32) * 4;
|
|---|
| 857 | int x, y;
|
|---|
| 858 |
|
|---|
| 859 | init();
|
|---|
| 860 |
|
|---|
| 861 | src24 -= stride24;
|
|---|
| 862 | dest4 -= stride4;
|
|---|
| 863 |
|
|---|
| 864 | for ( y = 0; y < gbm->h - 2; y += 3 )
|
|---|
| 865 | {
|
|---|
| 866 | const byte *src24a = (src24 += stride24);
|
|---|
| 867 | const byte *src24b = (src24 += stride24);
|
|---|
| 868 | const byte *src24c = (src24 += stride24);
|
|---|
| 869 | byte *dest4a = (dest4 += stride4);
|
|---|
| 870 | byte *dest4b = (dest4 += stride4);
|
|---|
| 871 | byte *dest4c = (dest4 += stride4);
|
|---|
| 872 | BOOLEAN left = TRUE;
|
|---|
| 873 |
|
|---|
| 874 | for ( x = 0; x < gbm->w - 2; x += 3, left = !left )
|
|---|
| 875 | /*...s3x3 case:24:*/
|
|---|
| 876 | {
|
|---|
| 877 | word r,g,b;
|
|---|
| 878 | byte inxs[9];
|
|---|
| 879 | byte *tmp;
|
|---|
| 880 |
|
|---|
| 881 | b = *src24a++; g = *src24a++; r = *src24a++;
|
|---|
| 882 | b += *src24a++; g += *src24a++; r += *src24a++;
|
|---|
| 883 | b += *src24a++; g += *src24a++; r += *src24a++;
|
|---|
| 884 | b += *src24b++; g += *src24b++; r += *src24b++;
|
|---|
| 885 | b += *src24b++; g += *src24b++; r += *src24b++;
|
|---|
| 886 | b += *src24b++; g += *src24b++; r += *src24b++;
|
|---|
| 887 | b += *src24c++; g += *src24c++; r += *src24c++;
|
|---|
| 888 | b += *src24c++; g += *src24c++; r += *src24c++;
|
|---|
| 889 | b += *src24c++; g += *src24c++; r += *src24c++;
|
|---|
| 890 |
|
|---|
| 891 | split_into(r, g, b, 9, inxs);
|
|---|
| 892 |
|
|---|
| 893 | if ( left )
|
|---|
| 894 | {
|
|---|
| 895 | *dest4a++ = ((inxs[0] << 4) | inxs[1]); *dest4a = (inxs[2] << 4);
|
|---|
| 896 | *dest4b++ = ((inxs[3] << 4) | inxs[4]); *dest4b = (inxs[5] << 4);
|
|---|
| 897 | *dest4c++ = ((inxs[6] << 4) | inxs[7]); *dest4c = (inxs[8] << 4);
|
|---|
| 898 | }
|
|---|
| 899 | else
|
|---|
| 900 | {
|
|---|
| 901 | *dest4a++ |= inxs[0]; *dest4a++ = ((inxs[1] << 4) | inxs[2]);
|
|---|
| 902 | *dest4b++ |= inxs[3]; *dest4b++ = ((inxs[4] << 4) | inxs[5]);
|
|---|
| 903 | *dest4c++ |= inxs[6]; *dest4c++ = ((inxs[7] << 4) | inxs[8]);
|
|---|
| 904 | }
|
|---|
| 905 |
|
|---|
| 906 | tmp = dest4a; dest4a = dest4b; dest4b = dest4c; dest4c = tmp;
|
|---|
| 907 | }
|
|---|
| 908 | /*...e*/
|
|---|
| 909 | if ( x < gbm->w - 1 )
|
|---|
| 910 | /*...s2x3 case:24:*/
|
|---|
| 911 | {
|
|---|
| 912 | word r,g,b;
|
|---|
| 913 | byte inxs[6];
|
|---|
| 914 |
|
|---|
| 915 | b = *src24a++; g = *src24a++; r = *src24a++;
|
|---|
| 916 | b += *src24a++; g += *src24a++; r += *src24a++;
|
|---|
| 917 | b += *src24b++; g += *src24b++; r += *src24b++;
|
|---|
| 918 | b += *src24b++; g += *src24b++; r += *src24b++;
|
|---|
| 919 | b += *src24c++; g += *src24c++; r += *src24c++;
|
|---|
| 920 | b += *src24c++; g += *src24c++; r += *src24c++;
|
|---|
| 921 |
|
|---|
| 922 | split_into(r, g, b, 6, inxs);
|
|---|
| 923 |
|
|---|
| 924 | if ( left )
|
|---|
| 925 | {
|
|---|
| 926 | *dest4a = ((inxs[0] << 4) | inxs[1]);
|
|---|
| 927 | *dest4b = ((inxs[2] << 4) | inxs[3]);
|
|---|
| 928 | *dest4c = ((inxs[4] << 4) | inxs[5]);
|
|---|
| 929 | }
|
|---|
| 930 | else
|
|---|
| 931 | {
|
|---|
| 932 | *dest4a++ |= inxs[0]; *dest4a = (inxs[1] << 4);
|
|---|
| 933 | *dest4b++ |= inxs[2]; *dest4b = (inxs[3] << 4);
|
|---|
| 934 | *dest4c++ |= inxs[4]; *dest4c = (inxs[5] << 4);
|
|---|
| 935 | }
|
|---|
| 936 | }
|
|---|
| 937 | /*...e*/
|
|---|
| 938 | else if ( x < gbm->w )
|
|---|
| 939 | /*...s1x3 case:24:*/
|
|---|
| 940 | {
|
|---|
| 941 | word r,g,b;
|
|---|
| 942 | byte inxs[3];
|
|---|
| 943 |
|
|---|
| 944 | b = *src24a++; g = *src24a++; r = *src24a++;
|
|---|
| 945 | b += *src24b++; g += *src24b++; r += *src24b++;
|
|---|
| 946 | b += *src24c++; g += *src24c++; r += *src24c++;
|
|---|
| 947 |
|
|---|
| 948 | split_into(r, g, b, 3, inxs);
|
|---|
| 949 |
|
|---|
| 950 | if ( left )
|
|---|
| 951 | {
|
|---|
| 952 | *dest4a = (inxs[0] << 4);
|
|---|
| 953 | *dest4b = (inxs[1] << 4);
|
|---|
| 954 | *dest4c = (inxs[2] << 4);
|
|---|
| 955 | }
|
|---|
| 956 | else
|
|---|
| 957 | {
|
|---|
| 958 | *dest4a |= inxs[0];
|
|---|
| 959 | *dest4b |= inxs[1];
|
|---|
| 960 | *dest4c |= inxs[2];
|
|---|
| 961 | }
|
|---|
| 962 | }
|
|---|
| 963 | /*...e*/
|
|---|
| 964 | }
|
|---|
| 965 | if ( y < gbm->h - 1 )
|
|---|
| 966 | {
|
|---|
| 967 | const byte *src24a = (src24 += stride24);
|
|---|
| 968 | const byte *src24b = (src24 += stride24);
|
|---|
| 969 | byte *dest4a = (dest4 += stride4);
|
|---|
| 970 | byte *dest4b = (dest4 += stride4);
|
|---|
| 971 | BOOLEAN left = TRUE;
|
|---|
| 972 |
|
|---|
| 973 | for ( x = 0; x < gbm->w - 2; x += 3, left = !left )
|
|---|
| 974 | /*...s3x2 case:24:*/
|
|---|
| 975 | {
|
|---|
| 976 | word r,g,b;
|
|---|
| 977 | byte inxs[6];
|
|---|
| 978 | byte *tmp;
|
|---|
| 979 |
|
|---|
| 980 | b = *src24a++; g = *src24a++; r = *src24a++;
|
|---|
| 981 | b += *src24a++; g += *src24a++; r += *src24a++;
|
|---|
| 982 | b += *src24a++; g += *src24a++; r += *src24a++;
|
|---|
| 983 | b += *src24b++; g += *src24b++; r += *src24b++;
|
|---|
| 984 | b += *src24b++; g += *src24b++; r += *src24b++;
|
|---|
| 985 | b += *src24b++; g += *src24b++; r += *src24b++;
|
|---|
| 986 |
|
|---|
| 987 | split_into(r, g, b, 6, inxs);
|
|---|
| 988 |
|
|---|
| 989 | if ( left )
|
|---|
| 990 | {
|
|---|
| 991 | *dest4a++ = (inxs[0] << 4) | inxs[1]; *dest4a = (inxs[2] << 4);
|
|---|
| 992 | *dest4b++ = (inxs[3] << 4) | inxs[4]; *dest4b = (inxs[5] << 4);
|
|---|
| 993 | }
|
|---|
| 994 | else
|
|---|
| 995 | {
|
|---|
| 996 | *dest4a++ |= inxs[0]; *dest4a++ = ((inxs[1] << 4) | inxs[2]);
|
|---|
| 997 | *dest4b++ |= inxs[3]; *dest4b++ = ((inxs[4] << 4) | inxs[5]);
|
|---|
| 998 | }
|
|---|
| 999 |
|
|---|
| 1000 | tmp = dest4a; dest4a = dest4b; dest4b = tmp;
|
|---|
| 1001 | }
|
|---|
| 1002 | /*...e*/
|
|---|
| 1003 | if ( x < gbm->w - 1 )
|
|---|
| 1004 | /*...s2x2 case:24:*/
|
|---|
| 1005 | {
|
|---|
| 1006 | word r,g,b;
|
|---|
| 1007 | byte inxs[4];
|
|---|
| 1008 |
|
|---|
| 1009 | b = *src24a++; g = *src24a++; r = *src24a++;
|
|---|
| 1010 | b += *src24a++; g += *src24a++; r += *src24a++;
|
|---|
| 1011 | b += *src24b++; g += *src24b++; r += *src24b++;
|
|---|
| 1012 | b += *src24b++; g += *src24b++; r += *src24b++;
|
|---|
| 1013 |
|
|---|
| 1014 | split_into(r, g, b, 4, inxs);
|
|---|
| 1015 |
|
|---|
| 1016 | if ( left )
|
|---|
| 1017 | {
|
|---|
| 1018 | *dest4a = ((inxs[0] << 4) | inxs[1]);
|
|---|
| 1019 | *dest4b = ((inxs[2] << 4) | inxs[3]);
|
|---|
| 1020 | }
|
|---|
| 1021 | else
|
|---|
| 1022 | {
|
|---|
| 1023 | *dest4a++ |= inxs[0]; *dest4a = (inxs[1] << 4);
|
|---|
| 1024 | *dest4b++ |= inxs[2]; *dest4b = (inxs[3] << 4);
|
|---|
| 1025 | }
|
|---|
| 1026 | }
|
|---|
| 1027 | /*...e*/
|
|---|
| 1028 | else if ( x < gbm->w )
|
|---|
| 1029 | /*...s1x2 case:24:*/
|
|---|
| 1030 | {
|
|---|
| 1031 | word r,g,b;
|
|---|
| 1032 | byte inxs[2];
|
|---|
| 1033 |
|
|---|
| 1034 | b = *src24a++; g = *src24a++; r = *src24a++;
|
|---|
| 1035 | b += *src24b++; g += *src24b++; r += *src24b++;
|
|---|
| 1036 |
|
|---|
| 1037 | split_into(r, g, b, 2, inxs);
|
|---|
| 1038 |
|
|---|
| 1039 | if ( left )
|
|---|
| 1040 | {
|
|---|
| 1041 | *dest4a = (inxs[0] << 4);
|
|---|
| 1042 | *dest4b = (inxs[1] << 4);
|
|---|
| 1043 | }
|
|---|
| 1044 | else
|
|---|
| 1045 | {
|
|---|
| 1046 | *dest4a |= inxs[0];
|
|---|
| 1047 | *dest4b |= inxs[1];
|
|---|
| 1048 | }
|
|---|
| 1049 | }
|
|---|
| 1050 | /*...e*/
|
|---|
| 1051 | }
|
|---|
| 1052 | else if ( y < gbm->h )
|
|---|
| 1053 | {
|
|---|
| 1054 | const byte *src24a = (src24 += stride24);
|
|---|
| 1055 | byte *dest4a = (dest4 += stride4);
|
|---|
| 1056 | BOOLEAN left = TRUE;
|
|---|
| 1057 |
|
|---|
| 1058 | for ( x = 0; x < gbm->w - 2; x += 3, left = !left )
|
|---|
| 1059 | /*...s3x1 case:24:*/
|
|---|
| 1060 | {
|
|---|
| 1061 | word r,g,b;
|
|---|
| 1062 | byte inxs[3];
|
|---|
| 1063 |
|
|---|
| 1064 | b = *src24a++; g = *src24a++; r = *src24a++;
|
|---|
| 1065 | b += *src24a++; g += *src24a++; r += *src24a++;
|
|---|
| 1066 | b += *src24a++; g += *src24a++; r += *src24a++;
|
|---|
| 1067 |
|
|---|
| 1068 | split_into(r, g, b, 3, inxs);
|
|---|
| 1069 |
|
|---|
| 1070 | if ( left )
|
|---|
| 1071 | {
|
|---|
| 1072 | *dest4a++ = ((inxs[0] << 4) | inxs[1]); *dest4a = (inxs[2] << 4);
|
|---|
| 1073 | }
|
|---|
| 1074 | else
|
|---|
| 1075 | {
|
|---|
| 1076 | *dest4a++ |= inxs[0]; *dest4a++ = ((inxs[1] << 4) | inxs[2]);
|
|---|
| 1077 | }
|
|---|
| 1078 | }
|
|---|
| 1079 | /*...e*/
|
|---|
| 1080 | if ( x < gbm->w - 1 )
|
|---|
| 1081 | /*...s2x1 case:24:*/
|
|---|
| 1082 | {
|
|---|
| 1083 | word r,g,b;
|
|---|
| 1084 | byte inxs[2];
|
|---|
| 1085 |
|
|---|
| 1086 | b = *src24a++; g = *src24a++; r = *src24a++;
|
|---|
| 1087 | b += *src24a++; g += *src24a++; r += *src24a++;
|
|---|
| 1088 |
|
|---|
| 1089 | split_into(r, g, b, 4, inxs);
|
|---|
| 1090 |
|
|---|
| 1091 | if ( left )
|
|---|
| 1092 | *dest4a = ((inxs[0] << 4) | inxs[1]);
|
|---|
| 1093 | else
|
|---|
| 1094 | {
|
|---|
| 1095 | *dest4a++ |= inxs[0]; *dest4a = (inxs[1] << 4);
|
|---|
| 1096 | }
|
|---|
| 1097 | }
|
|---|
| 1098 | /*...e*/
|
|---|
| 1099 | else if ( x < gbm->w )
|
|---|
| 1100 | /*...s1x1 case:24:*/
|
|---|
| 1101 | {
|
|---|
| 1102 | word r,g,b;
|
|---|
| 1103 | byte inx;
|
|---|
| 1104 |
|
|---|
| 1105 | b = *src24a++; g = *src24a++; r = *src24a++;
|
|---|
| 1106 |
|
|---|
| 1107 | inx = takefrom(r, g, b);
|
|---|
| 1108 |
|
|---|
| 1109 | if ( left )
|
|---|
| 1110 | *dest4a = (inx << 4);
|
|---|
| 1111 | else
|
|---|
| 1112 | *dest4a |= inx;
|
|---|
| 1113 | }
|
|---|
| 1114 | /*...e*/
|
|---|
| 1115 | }
|
|---|
| 1116 | }
|
|---|
| 1117 | /*...e*/
|
|---|
| 1118 |
|
|---|
| 1119 | /*...sgbm_ht_pal_8 \45\ return default 8 colour palette:0:*/
|
|---|
| 1120 | /*
|
|---|
| 1121 | This function makes the palette for the 8 colour palette.
|
|---|
| 1122 | */
|
|---|
| 1123 |
|
|---|
| 1124 | void gbm_ht_pal_8(GBMRGB *gbmrgb)
|
|---|
| 1125 | {
|
|---|
| 1126 | init();
|
|---|
| 1127 | memcpy((char *) gbmrgb, (char *) gbmrgb_8, sizeof(gbmrgb_8));
|
|---|
| 1128 | }
|
|---|
| 1129 | /*...e*/
|
|---|
| 1130 | /*...sgbm_ht_8_2x2 \45\ halftone by 2x2 to default 8 colour palette:0:*/
|
|---|
| 1131 | void gbm_ht_8_2x2(const GBM *gbm, const byte *src24, byte *dest4)
|
|---|
| 1132 | {
|
|---|
| 1133 | int stride24 = ((gbm->w * 3 + 3) & ~3);
|
|---|
| 1134 | int stride4 = ((gbm->w * 4 + 31) / 32) * 4;
|
|---|
| 1135 | int x, y;
|
|---|
| 1136 |
|
|---|
| 1137 | init();
|
|---|
| 1138 |
|
|---|
| 1139 | src24 -= stride24;
|
|---|
| 1140 | dest4 -= stride4;
|
|---|
| 1141 |
|
|---|
| 1142 | for ( y = 0; y < gbm->h - 1; y += 2 )
|
|---|
| 1143 | {
|
|---|
| 1144 | const byte *src24a = (src24 += stride24);
|
|---|
| 1145 | const byte *src24b = (src24 += stride24);
|
|---|
| 1146 | byte *dest4a = (dest4 += stride4);
|
|---|
| 1147 | byte *dest4b = (dest4 += stride4);
|
|---|
| 1148 |
|
|---|
| 1149 | for ( x = 0; x < gbm->w - 1; x += 2 )
|
|---|
| 1150 | /*...s2x2 case:24:*/
|
|---|
| 1151 | {
|
|---|
| 1152 | word r,g,b;
|
|---|
| 1153 | byte inx;
|
|---|
| 1154 | byte *tmp;
|
|---|
| 1155 |
|
|---|
| 1156 | b = *src24a++; g = *src24a++; r = *src24a++;
|
|---|
| 1157 | b += *src24a++; g += *src24a++; r += *src24a++;
|
|---|
| 1158 | b += *src24b++; g += *src24b++; r += *src24b++;
|
|---|
| 1159 | b += *src24b++; g += *src24b++; r += *src24b++;
|
|---|
| 1160 |
|
|---|
| 1161 | inx = takefrom8(r >> 2, g >> 2, b >> 2); *dest4a = (inx << 4);
|
|---|
| 1162 | b -= gbmrgb_8[inx].b; g -= gbmrgb_8[inx].g; r -= gbmrgb_8[inx].r;
|
|---|
| 1163 |
|
|---|
| 1164 | inx = takefrom8(r / 3, g / 3, b / 3); *dest4a++ |= inx;
|
|---|
| 1165 | b -= gbmrgb_8[inx].b; g -= gbmrgb_8[inx].g; r -= gbmrgb_8[inx].r;
|
|---|
| 1166 |
|
|---|
| 1167 | inx = takefrom8(r >> 1, g >> 1, b >> 1); *dest4b = (inx << 4);
|
|---|
| 1168 | b -= gbmrgb_8[inx].b; g -= gbmrgb_8[inx].g; r -= gbmrgb_8[inx].r;
|
|---|
| 1169 |
|
|---|
| 1170 | inx = takefrom8(r , g , b ); *dest4b++ |= inx;
|
|---|
| 1171 |
|
|---|
| 1172 | tmp = dest4a; dest4a = dest4b; dest4b = tmp;
|
|---|
| 1173 | }
|
|---|
| 1174 | /*...e*/
|
|---|
| 1175 | if ( x < gbm->w )
|
|---|
| 1176 | /*...s1x2 case:24:*/
|
|---|
| 1177 | {
|
|---|
| 1178 | word r,g,b;
|
|---|
| 1179 | byte inx;
|
|---|
| 1180 |
|
|---|
| 1181 | b = *src24a++; g = *src24a++; r = *src24a;
|
|---|
| 1182 | b += *src24b++; g += *src24b++; r += *src24b;
|
|---|
| 1183 |
|
|---|
| 1184 | inx = takefrom8(r >> 1, g >> 1, b >> 1); *dest4a = (inx << 4);
|
|---|
| 1185 | b -= gbmrgb_8[inx].b; g -= gbmrgb_8[inx].g; r -= gbmrgb_8[inx].r;
|
|---|
| 1186 |
|
|---|
| 1187 | inx = takefrom8(r , g , b ); *dest4b = (inx << 4);
|
|---|
| 1188 | }
|
|---|
| 1189 | /*...e*/
|
|---|
| 1190 | }
|
|---|
| 1191 | if ( y < gbm->h )
|
|---|
| 1192 | {
|
|---|
| 1193 | const byte *src24a = src24 + stride24;
|
|---|
| 1194 | byte *dest4a = dest4 + stride4;
|
|---|
| 1195 |
|
|---|
| 1196 | for ( x = 0; x < gbm->w - 1; x += 2 )
|
|---|
| 1197 | /*...s2x1 case:24:*/
|
|---|
| 1198 | {
|
|---|
| 1199 | word r,g,b;
|
|---|
| 1200 | byte inx;
|
|---|
| 1201 |
|
|---|
| 1202 | b = *src24a++; g = *src24a++; r = *src24a++;
|
|---|
| 1203 | b += *src24a++; g += *src24a++; r += *src24a++;
|
|---|
| 1204 |
|
|---|
| 1205 | inx = takefrom8(r >> 1, g >> 1, b >> 1); *dest4a = (inx << 4);
|
|---|
| 1206 | b -= gbmrgb_8[inx].b; g -= gbmrgb_8[inx].g; r -= gbmrgb_8[inx].r;
|
|---|
| 1207 |
|
|---|
| 1208 | inx = takefrom8(r , g , b ); *dest4a++ |= inx;
|
|---|
| 1209 | }
|
|---|
| 1210 | /*...e*/
|
|---|
| 1211 | if ( x < gbm->w )
|
|---|
| 1212 | /*...s1x1 case:24:*/
|
|---|
| 1213 | {
|
|---|
| 1214 | word r, g, b;
|
|---|
| 1215 | byte inx;
|
|---|
| 1216 |
|
|---|
| 1217 | b = *src24a++; g = *src24a++; r = *src24a;
|
|---|
| 1218 | inx = takefrom8(r, g, b); *dest4a = (inx << 4);
|
|---|
| 1219 | }
|
|---|
| 1220 | /*...e*/
|
|---|
| 1221 | }
|
|---|
| 1222 | }
|
|---|
| 1223 | /*...e*/
|
|---|
| 1224 | /*...sgbm_ht_8_3x3 \45\ halftone by 3x3 to default 8 colour palette:0:*/
|
|---|
| 1225 | void gbm_ht_8_3x3(const GBM *gbm, const byte *src24, byte *dest4)
|
|---|
| 1226 | {
|
|---|
| 1227 | int stride24 = ((gbm->w * 3 + 3) & ~3);
|
|---|
| 1228 | int stride4 = ((gbm->w * 4 + 31) / 32) * 4;
|
|---|
| 1229 | int x, y;
|
|---|
| 1230 |
|
|---|
| 1231 | init();
|
|---|
| 1232 |
|
|---|
| 1233 | src24 -= stride24;
|
|---|
| 1234 | dest4 -= stride4;
|
|---|
| 1235 |
|
|---|
| 1236 | for ( y = 0; y < gbm->h - 2; y += 3 )
|
|---|
| 1237 | {
|
|---|
| 1238 | const byte *src24a = (src24 += stride24);
|
|---|
| 1239 | const byte *src24b = (src24 += stride24);
|
|---|
| 1240 | const byte *src24c = (src24 += stride24);
|
|---|
| 1241 | byte *dest4a = (dest4 += stride4);
|
|---|
| 1242 | byte *dest4b = (dest4 += stride4);
|
|---|
| 1243 | byte *dest4c = (dest4 += stride4);
|
|---|
| 1244 | BOOLEAN left = TRUE;
|
|---|
| 1245 |
|
|---|
| 1246 | for ( x = 0; x < gbm->w - 2; x += 3, left = !left )
|
|---|
| 1247 | /*...s3x3 case:24:*/
|
|---|
| 1248 | {
|
|---|
| 1249 | word r,g,b;
|
|---|
| 1250 | byte inxs[9];
|
|---|
| 1251 | byte *tmp;
|
|---|
| 1252 |
|
|---|
| 1253 | b = *src24a++; g = *src24a++; r = *src24a++;
|
|---|
| 1254 | b += *src24a++; g += *src24a++; r += *src24a++;
|
|---|
| 1255 | b += *src24a++; g += *src24a++; r += *src24a++;
|
|---|
| 1256 | b += *src24b++; g += *src24b++; r += *src24b++;
|
|---|
| 1257 | b += *src24b++; g += *src24b++; r += *src24b++;
|
|---|
| 1258 | b += *src24b++; g += *src24b++; r += *src24b++;
|
|---|
| 1259 | b += *src24c++; g += *src24c++; r += *src24c++;
|
|---|
| 1260 | b += *src24c++; g += *src24c++; r += *src24c++;
|
|---|
| 1261 | b += *src24c++; g += *src24c++; r += *src24c++;
|
|---|
| 1262 |
|
|---|
| 1263 | split_into8(r, g, b, 9, inxs);
|
|---|
| 1264 |
|
|---|
| 1265 | if ( left )
|
|---|
| 1266 | {
|
|---|
| 1267 | *dest4a++ = ((inxs[0] << 4) | inxs[1]); *dest4a = (inxs[2] << 4);
|
|---|
| 1268 | *dest4b++ = ((inxs[3] << 4) | inxs[4]); *dest4b = (inxs[5] << 4);
|
|---|
| 1269 | *dest4c++ = ((inxs[6] << 4) | inxs[7]); *dest4c = (inxs[8] << 4);
|
|---|
| 1270 | }
|
|---|
| 1271 | else
|
|---|
| 1272 | {
|
|---|
| 1273 | *dest4a++ |= inxs[0]; *dest4a++ = ((inxs[1] << 4) | inxs[2]);
|
|---|
| 1274 | *dest4b++ |= inxs[3]; *dest4b++ = ((inxs[4] << 4) | inxs[5]);
|
|---|
| 1275 | *dest4c++ |= inxs[6]; *dest4c++ = ((inxs[7] << 4) | inxs[8]);
|
|---|
| 1276 | }
|
|---|
| 1277 |
|
|---|
| 1278 | tmp = dest4a; dest4a = dest4b; dest4b = dest4c; dest4c = tmp;
|
|---|
| 1279 | }
|
|---|
| 1280 | /*...e*/
|
|---|
| 1281 | if ( x < gbm->w - 1 )
|
|---|
| 1282 | /*...s2x3 case:24:*/
|
|---|
| 1283 | {
|
|---|
| 1284 | word r,g,b;
|
|---|
| 1285 | byte inxs[6];
|
|---|
| 1286 |
|
|---|
| 1287 | b = *src24a++; g = *src24a++; r = *src24a++;
|
|---|
| 1288 | b += *src24a++; g += *src24a++; r += *src24a++;
|
|---|
| 1289 | b += *src24b++; g += *src24b++; r += *src24b++;
|
|---|
| 1290 | b += *src24b++; g += *src24b++; r += *src24b++;
|
|---|
| 1291 | b += *src24c++; g += *src24c++; r += *src24c++;
|
|---|
| 1292 | b += *src24c++; g += *src24c++; r += *src24c++;
|
|---|
| 1293 |
|
|---|
| 1294 | split_into8(r, g, b, 6, inxs);
|
|---|
| 1295 |
|
|---|
| 1296 | if ( left )
|
|---|
| 1297 | {
|
|---|
| 1298 | *dest4a = ((inxs[0] << 4) | inxs[1]);
|
|---|
| 1299 | *dest4b = ((inxs[2] << 4) | inxs[3]);
|
|---|
| 1300 | *dest4c = ((inxs[4] << 4) | inxs[5]);
|
|---|
| 1301 | }
|
|---|
| 1302 | else
|
|---|
| 1303 | {
|
|---|
| 1304 | *dest4a++ |= inxs[0]; *dest4a = (inxs[1] << 4);
|
|---|
| 1305 | *dest4b++ |= inxs[2]; *dest4b = (inxs[3] << 4);
|
|---|
| 1306 | *dest4c++ |= inxs[4]; *dest4c = (inxs[5] << 4);
|
|---|
| 1307 | }
|
|---|
| 1308 | }
|
|---|
| 1309 | /*...e*/
|
|---|
| 1310 | else if ( x < gbm->w )
|
|---|
| 1311 | /*...s1x3 case:24:*/
|
|---|
| 1312 | {
|
|---|
| 1313 | word r,g,b;
|
|---|
| 1314 | byte inxs[3];
|
|---|
| 1315 |
|
|---|
| 1316 | b = *src24a++; g = *src24a++; r = *src24a++;
|
|---|
| 1317 | b += *src24b++; g += *src24b++; r += *src24b++;
|
|---|
| 1318 | b += *src24c++; g += *src24c++; r += *src24c++;
|
|---|
| 1319 |
|
|---|
| 1320 | split_into8(r, g, b, 3, inxs);
|
|---|
| 1321 |
|
|---|
| 1322 | if ( left )
|
|---|
| 1323 | {
|
|---|
| 1324 | *dest4a = (inxs[0] << 4);
|
|---|
| 1325 | *dest4b = (inxs[1] << 4);
|
|---|
| 1326 | *dest4c = (inxs[2] << 4);
|
|---|
| 1327 | }
|
|---|
| 1328 | else
|
|---|
| 1329 | {
|
|---|
| 1330 | *dest4a |= inxs[0];
|
|---|
| 1331 | *dest4b |= inxs[1];
|
|---|
| 1332 | *dest4c |= inxs[2];
|
|---|
| 1333 | }
|
|---|
| 1334 | }
|
|---|
| 1335 | /*...e*/
|
|---|
| 1336 | }
|
|---|
| 1337 | if ( y < gbm->h - 1 )
|
|---|
| 1338 | {
|
|---|
| 1339 | const byte *src24a = (src24 += stride24);
|
|---|
| 1340 | const byte *src24b = (src24 += stride24);
|
|---|
| 1341 | byte *dest4a = (dest4 += stride4);
|
|---|
| 1342 | byte *dest4b = (dest4 += stride4);
|
|---|
| 1343 | BOOLEAN left = TRUE;
|
|---|
| 1344 |
|
|---|
| 1345 | for ( x = 0; x < gbm->w - 2; x += 3, left = !left )
|
|---|
| 1346 | /*...s3x2 case:24:*/
|
|---|
| 1347 | {
|
|---|
| 1348 | word r,g,b;
|
|---|
| 1349 | byte inxs[6];
|
|---|
| 1350 | byte *tmp;
|
|---|
| 1351 |
|
|---|
| 1352 | b = *src24a++; g = *src24a++; r = *src24a++;
|
|---|
| 1353 | b += *src24a++; g += *src24a++; r += *src24a++;
|
|---|
| 1354 | b += *src24a++; g += *src24a++; r += *src24a++;
|
|---|
| 1355 | b += *src24b++; g += *src24b++; r += *src24b++;
|
|---|
| 1356 | b += *src24b++; g += *src24b++; r += *src24b++;
|
|---|
| 1357 | b += *src24b++; g += *src24b++; r += *src24b++;
|
|---|
| 1358 |
|
|---|
| 1359 | split_into8(r, g, b, 6, inxs);
|
|---|
| 1360 |
|
|---|
| 1361 | if ( left )
|
|---|
| 1362 | {
|
|---|
| 1363 | *dest4a++ = (inxs[0] << 4) | inxs[1]; *dest4a = (inxs[2] << 4);
|
|---|
| 1364 | *dest4b++ = (inxs[3] << 4) | inxs[4]; *dest4b = (inxs[5] << 4);
|
|---|
| 1365 | }
|
|---|
| 1366 | else
|
|---|
| 1367 | {
|
|---|
| 1368 | *dest4a++ |= inxs[0]; *dest4a++ = ((inxs[1] << 4) | inxs[2]);
|
|---|
| 1369 | *dest4b++ |= inxs[3]; *dest4b++ = ((inxs[4] << 4) | inxs[5]);
|
|---|
| 1370 | }
|
|---|
| 1371 |
|
|---|
| 1372 | tmp = dest4a; dest4a = dest4b; dest4b = tmp;
|
|---|
| 1373 | }
|
|---|
| 1374 | /*...e*/
|
|---|
| 1375 | if ( x < gbm->w - 1 )
|
|---|
| 1376 | /*...s2x2 case:24:*/
|
|---|
| 1377 | {
|
|---|
| 1378 | word r,g,b;
|
|---|
| 1379 | byte inxs[4];
|
|---|
| 1380 |
|
|---|
| 1381 | b = *src24a++; g = *src24a++; r = *src24a++;
|
|---|
| 1382 | b += *src24a++; g += *src24a++; r += *src24a++;
|
|---|
| 1383 | b += *src24b++; g += *src24b++; r += *src24b++;
|
|---|
| 1384 | b += *src24b++; g += *src24b++; r += *src24b++;
|
|---|
| 1385 |
|
|---|
| 1386 | split_into8(r, g, b, 4, inxs);
|
|---|
| 1387 |
|
|---|
| 1388 | if ( left )
|
|---|
| 1389 | {
|
|---|
| 1390 | *dest4a = ((inxs[0] << 4) | inxs[1]);
|
|---|
| 1391 | *dest4b = ((inxs[2] << 4) | inxs[3]);
|
|---|
| 1392 | }
|
|---|
| 1393 | else
|
|---|
| 1394 | {
|
|---|
| 1395 | *dest4a++ |= inxs[0]; *dest4a = (inxs[1] << 4);
|
|---|
| 1396 | *dest4b++ |= inxs[2]; *dest4b = (inxs[3] << 4);
|
|---|
| 1397 | }
|
|---|
| 1398 | }
|
|---|
| 1399 | /*...e*/
|
|---|
| 1400 | else if ( x < gbm->w )
|
|---|
| 1401 | /*...s1x2 case:24:*/
|
|---|
| 1402 | {
|
|---|
| 1403 | word r,g,b;
|
|---|
| 1404 | byte inxs[2];
|
|---|
| 1405 |
|
|---|
| 1406 | b = *src24a++; g = *src24a++; r = *src24a++;
|
|---|
| 1407 | b += *src24b++; g += *src24b++; r += *src24b++;
|
|---|
| 1408 |
|
|---|
| 1409 | split_into8(r, g, b, 2, inxs);
|
|---|
| 1410 |
|
|---|
| 1411 | if ( left )
|
|---|
| 1412 | {
|
|---|
| 1413 | *dest4a = (inxs[0] << 4);
|
|---|
| 1414 | *dest4b = (inxs[1] << 4);
|
|---|
| 1415 | }
|
|---|
| 1416 | else
|
|---|
| 1417 | {
|
|---|
| 1418 | *dest4a |= inxs[0];
|
|---|
| 1419 | *dest4b |= inxs[1];
|
|---|
| 1420 | }
|
|---|
| 1421 | }
|
|---|
| 1422 | /*...e*/
|
|---|
| 1423 | }
|
|---|
| 1424 | else if ( y < gbm->h )
|
|---|
| 1425 | {
|
|---|
| 1426 | const byte *src24a = (src24 += stride24);
|
|---|
| 1427 | byte *dest4a = (dest4 += stride4);
|
|---|
| 1428 | BOOLEAN left = TRUE;
|
|---|
| 1429 |
|
|---|
| 1430 | for ( x = 0; x < gbm->w - 2; x += 3, left = !left )
|
|---|
| 1431 | /*...s3x1 case:24:*/
|
|---|
| 1432 | {
|
|---|
| 1433 | word r,g,b;
|
|---|
| 1434 | byte inxs[3];
|
|---|
| 1435 |
|
|---|
| 1436 | b = *src24a++; g = *src24a++; r = *src24a++;
|
|---|
| 1437 | b += *src24a++; g += *src24a++; r += *src24a++;
|
|---|
| 1438 | b += *src24a++; g += *src24a++; r += *src24a++;
|
|---|
| 1439 |
|
|---|
| 1440 | split_into8(r, g, b, 3, inxs);
|
|---|
| 1441 |
|
|---|
| 1442 | if ( left )
|
|---|
| 1443 | {
|
|---|
| 1444 | *dest4a++ = ((inxs[0] << 4) | inxs[1]); *dest4a = (inxs[2] << 4);
|
|---|
| 1445 | }
|
|---|
| 1446 | else
|
|---|
| 1447 | {
|
|---|
| 1448 | *dest4a++ |= inxs[0]; *dest4a++ = ((inxs[1] << 4) | inxs[2]);
|
|---|
| 1449 | }
|
|---|
| 1450 | }
|
|---|
| 1451 | /*...e*/
|
|---|
| 1452 | if ( x < gbm->w - 1 )
|
|---|
| 1453 | /*...s2x1 case:24:*/
|
|---|
| 1454 | {
|
|---|
| 1455 | word r,g,b;
|
|---|
| 1456 | byte inxs[2];
|
|---|
| 1457 |
|
|---|
| 1458 | b = *src24a++; g = *src24a++; r = *src24a++;
|
|---|
| 1459 | b += *src24a++; g += *src24a++; r += *src24a++;
|
|---|
| 1460 |
|
|---|
| 1461 | split_into8(r, g, b, 4, inxs);
|
|---|
| 1462 |
|
|---|
| 1463 | if ( left )
|
|---|
| 1464 | *dest4a = ((inxs[0] << 4) | inxs[1]);
|
|---|
| 1465 | else
|
|---|
| 1466 | {
|
|---|
| 1467 | *dest4a++ |= inxs[0]; *dest4a = (inxs[1] << 4);
|
|---|
| 1468 | }
|
|---|
| 1469 | }
|
|---|
| 1470 | /*...e*/
|
|---|
| 1471 | else if ( x < gbm->w )
|
|---|
| 1472 | /*...s1x1 case:24:*/
|
|---|
| 1473 | {
|
|---|
| 1474 | word r,g,b;
|
|---|
| 1475 | byte inx;
|
|---|
| 1476 |
|
|---|
| 1477 | b = *src24a++; g = *src24a++; r = *src24a++;
|
|---|
| 1478 |
|
|---|
| 1479 | inx = takefrom8(r, g, b);
|
|---|
| 1480 |
|
|---|
| 1481 | if ( left )
|
|---|
| 1482 | *dest4a = (inx << 4);
|
|---|
| 1483 | else
|
|---|
| 1484 | *dest4a |= inx;
|
|---|
| 1485 | }
|
|---|
| 1486 | /*...e*/
|
|---|
| 1487 | }
|
|---|
| 1488 | }
|
|---|
| 1489 | /*...e*/
|
|---|
