vnchextile.h

   1 #define CONCAT_I(a, b) a ## b
   2 #define CONCAT(a, b) CONCAT_I(a, b)
   3 #define pixel_t CONCAT(uint, CONCAT(BPP, _t))
   4 #ifdef GENERIC
   5 #define NAME generic
   6 #else
   7 #define NAME BPP
   8 #endif
   9
  10 static void CONCAT(send_hextile_tile_, NAME)(VncState *vs,
  11                                              int x, int y, int w, int h,
  12                                              uint32_t *last_bg32,
  13                                              uint32_t *last_fg32,
  14                                              int *has_bg, int *has_fg)
  15 {
  16     uint8_t *row = (vs->ds->data + y * vs->ds->linesize + x * vs->depth);
  17     pixel_t *irow = (pixel_t *)row;
  18     int j, i;
  19     pixel_t *last_bg = (pixel_t *)last_bg32;
  20     pixel_t *last_fg = (pixel_t *)last_fg32;
  21     pixel_t bg = 0;
  22     pixel_t fg = 0;
  23     int n_colors = 0;
  24     int bg_count = 0;
  25     int fg_count = 0;
  26     int flags = 0;
  27     uint8_t data[(sizeof(pixel_t) + 2) * 16 * 16];
  28     int n_data = 0;
  29     int n_subtiles = 0;
  30
  31     for (j = 0; j < h; j++) {
  32         for (i = 0; i < w; i++) {
  33             switch (n_colors) {
  34             case 0:
  35                 bg = irow[i];
  36                 n_colors = 1;
  37                 break;
  38             case 1:
  39                 if (irow[i] != bg) {
  40                     fg = irow[i];
  41                     n_colors = 2;
  42                 }
  43                 break;
  44             case 2:
  45                 if (irow[i] != bg && irow[i] != fg) {
  46                     n_colors = 3;
  47                 } else {
  48                     if (irow[i] == bg)
  49                         bg_count++;
  50                     else if (irow[i] == fg)
  51                         fg_count++;
  52                 }
  53                 break;
  54             default:
  55                 break;
  56             }
  57         }
  58         if (n_colors > 2)
  59             break;
  60         irow += vs->ds->linesize / sizeof(pixel_t);
  61     }
  62
  63     if (n_colors > 1 && fg_count > bg_count) {
  64         pixel_t tmp = fg;
  65         fg = bg;
  66         bg = tmp;
  67     }
  68
  69     if (!*has_bg || *last_bg != bg) {
  70         flags |= 0x02;
  71         *has_bg = 1;
  72         *last_bg = bg;
  73     }
  74
  75     if (!*has_fg || *last_fg != fg) {
  76         flags |= 0x04;
  77         *has_fg = 1;
  78         *last_fg = fg;
  79     }
  80
  81     switch (n_colors) {
  82     case 1:
  83         n_data = 0;
  84         break;
  85     case 2:
  86         flags |= 0x08;
  87
  88         irow = (pixel_t *)row;
  89
  90         for (j = 0; j < h; j++) {
  91             int min_x = -1;
  92             for (i = 0; i < w; i++) {
  93                 if (irow[i] == fg) {
  94                     if (min_x == -1)
  95                         min_x = i;
  96                 } else if (min_x != -1) {
  97                     hextile_enc_cord(data + n_data, min_x, j, i - min_x, 1);
  98                     n_data += 2;
  99                     n_subtiles++;
 100                     min_x = -1;
 101                 }
 102             }
 103             if (min_x != -1) {
 104                 hextile_enc_cord(data + n_data, min_x, j, i - min_x, 1);
 105                 n_data += 2;
 106                 n_subtiles++;
 107             }
 108             irow += vs->ds->linesize / sizeof(pixel_t);
 109         }
 110         break;
 111     case 3:
 112         flags |= 0x18;
 113
 114         irow = (pixel_t *)row;
 115
 116         if (!*has_bg || *last_bg != bg)
 117             flags |= 0x02;
 118
 119         for (j = 0; j < h; j++) {
 120             int has_color = 0;
 121             int min_x = -1;
 122             pixel_t color = 0; /* shut up gcc */
 123
 124             for (i = 0; i < w; i++) {
 125                 if (!has_color) {
 126                     if (irow[i] == bg)
 127                         continue;
 128                     color = irow[i];
 129                     min_x = i;
 130                     has_color = 1;
 131                 } else if (irow[i] != color) {
 132                     has_color = 0;
 133 #ifdef GENERIC
 134                     vnc_convert_pixel(vs, data + n_data, color);
 135                     n_data += vs->pix_bpp;
 136 #else
 137                     memcpy(data + n_data, &color, sizeof(color));
 138                     n_data += sizeof(pixel_t);
 139 #endif
 140                     hextile_enc_cord(data + n_data, min_x, j, i - min_x, 1);
 141                     n_data += 2;
 142                     n_subtiles++;
 143
 144                     min_x = -1;
 145                     if (irow[i] != bg) {
 146                         color = irow[i];
 147                         min_x = i;
 148                         has_color = 1;
 149                     }
 150                 }
 151             }
 152             if (has_color) {
 153 #ifdef GENERIC
 154                 vnc_convert_pixel(vs, data + n_data, color);
 155                 n_data += vs->pix_bpp;
 156 #else
 157                 memcpy(data + n_data, &color, sizeof(color));
 158                 n_data += sizeof(pixel_t);
 159 #endif
 160                 hextile_enc_cord(data + n_data, min_x, j, i - min_x, 1);
 161                 n_data += 2;
 162                 n_subtiles++;
 163             }
 164             irow += vs->ds->linesize / sizeof(pixel_t);
 165         }
 166
 167         /* A SubrectsColoured subtile invalidates the foreground color */
 168         *has_fg = 0;
 169         if (n_data > (w * h * sizeof(pixel_t))) {
 170             n_colors = 4;
 171             flags = 0x01;
 172             *has_bg = 0;
 173
 174             /* we really don't have to invalidate either the bg or fg
 175                but we've lost the old values.  oh well. */
 176         }
 177     default:
 178         break;
 179     }
 180
 181     if (n_colors > 3) {
 182         flags = 0x01;
 183         *has_fg = 0;
 184         *has_bg = 0;
 185         n_colors = 4;
 186     }
 187
 188     vnc_write_u8(vs, flags);
 189     if (n_colors < 4) {
 190         if (flags & 0x02)
 191             vs->write_pixels(vs, last_bg, sizeof(pixel_t));
 192         if (flags & 0x04)
 193             vs->write_pixels(vs, last_fg, sizeof(pixel_t));
 194         if (n_subtiles) {
 195             vnc_write_u8(vs, n_subtiles);
 196             vnc_write(vs, data, n_data);
 197         }
 198     } else {
 199         for (j = 0; j < h; j++) {
 200             vs->write_pixels(vs, row, w * vs->depth);
 201             row += vs->ds->linesize;
 202         }
 203     }
 204 }
 205
 206 #undef NAME
 207 #undef pixel_t
 208 #undef CONCAT_I
 209 #undef CONCAT