drivers/video/atafb_iplan2p8.c

   1 /*
   2  *  linux/drivers/video/iplan2p8.c -- Low level frame buffer operations for
   3  *                                    interleaved bitplanes à la Atari (8
   4  *                                    planes, 2 bytes interleave)
   5  *
   6  *      Created 5 Apr 1997 by Geert Uytterhoeven
   7  *
   8  *  This file is subject to the terms and conditions of the GNU General Public
   9  *  License.  See the file COPYING in the main directory of this archive for
  10  *  more details.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/string.h>
  15 #include <linux/fb.h>
  16
  17 #include <asm/setup.h>
  18
  19 #include "atafb.h"
  20
  21 #define BPL     8
  22 #include "atafb_utils.h"
  23
  24
  25 /* Copies a 8 plane column from 's', height 'h', to 'd'. */
  26
  27 /* This expands a 8 bit color into two longs for two movepl (8 plane)
  28  * operations.
  29  */
  30
  31 void atafb_iplan2p8_copyarea(struct fb_info *info, u_long next_line,
  32                              int sy, int sx, int dy, int dx,
  33                              int height, int width)
  34 {
  35         /*  bmove() has to distinguish two major cases: If both, source and
  36          *  destination, start at even addresses or both are at odd
  37          *  addresses, just the first odd and last even column (if present)
  38          *  require special treatment (memmove_col()). The rest between
  39          *  then can be copied by normal operations, because all adjacent
  40          *  bytes are affected and are to be stored in the same order.
  41          *    The pathological case is when the move should go from an odd
  42          *  address to an even or vice versa. Since the bytes in the plane
  43          *  words must be assembled in new order, it seems wisest to make
  44          *  all movements by memmove_col().
  45          */
  46
  47         u8 *src, *dst;
  48         u32 *s, *d;
  49         int w, l , i, j;
  50         u_int colsize;
  51         u_int upwards = (dy < sy) || (dy == sy && dx < sx);
  52
  53         colsize = height;
  54         if (!((sx ^ dx) & 15)) {
  55                 /* odd->odd or even->even */
  56
  57                 if (upwards) {
  58                         src = (u8 *)info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL);
  59                         dst = (u8 *)info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL);
  60                         if (sx & 15) {
  61                                 memmove32_col(dst, src, 0xff00ff, height, next_line - BPL * 2);
  62                                 src += BPL * 2;
  63                                 dst += BPL * 2;
  64                                 width -= 8;
  65                         }
  66                         w = width >> 4;
  67                         if (w) {
  68                                 s = (u32 *)src;
  69                                 d = (u32 *)dst;
  70                                 w *= BPL / 2;
  71                                 l = next_line - w * 4;
  72                                 for (j = height; j > 0; j--) {
  73                                         for (i = w; i > 0; i--)
  74                                                 *d++ = *s++;
  75                                         s = (u32 *)((u8 *)s + l);
  76                                         d = (u32 *)((u8 *)d + l);
  77                                 }
  78                         }
  79                         if (width & 15)
  80                                 memmove32_col(dst + width / (8 / BPL), src + width / (8 / BPL),
  81                                               0xff00ff00, height, next_line - BPL * 2);
  82                 } else {
  83                         src = (u8 *)info->screen_base + (sy - 1) * next_line + ((sx + width + 8) & ~15) / (8 / BPL);
  84                         dst = (u8 *)info->screen_base + (dy - 1) * next_line + ((dx + width + 8) & ~15) / (8 / BPL);
  85
  86                         if ((sx + width) & 15) {
  87                                 src -= BPL * 2;
  88                                 dst -= BPL * 2;
  89                                 memmove32_col(dst, src, 0xff00ff00, colsize, -next_line - BPL * 2);
  90                                 width -= 8;
  91                         }
  92                         w = width >> 4;
  93                         if (w) {
  94                                 s = (u32 *)src;
  95                                 d = (u32 *)dst;
  96                                 w *= BPL / 2;
  97                                 l = next_line - w * 4;
  98                                 for (j = height; j > 0; j--) {
  99                                         for (i = w; i > 0; i--)
 100                                                 *--d = *--s;
 101                                         s = (u32 *)((u8 *)s - l);
 102                                         d = (u32 *)((u8 *)d - l);
 103                                 }
 104                         }
 105                         if (sx & 15)
 106                                 memmove32_col(dst - (width - 16) / (8 / BPL),
 107                                               src - (width - 16) / (8 / BPL),
 108                                               0xff00ff, colsize, -next_line - BPL * 2);
 109                 }
 110         } else {
 111                 /* odd->even or even->odd */
 112                 if (upwards) {
 113                         u32 *src32, *dst32;
 114                         u32 pval[4], v, v1, mask;
 115                         int i, j, w, f;
 116
 117                         src = (u8 *)info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL);
 118                         dst = (u8 *)info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL);
 119
 120                         mask = 0xff00ff00;
 121                         f = 0;
 122                         w = width;
 123                         if (sx & 15) {
 124                                 f = 1;
 125                                 w += 8;
 126                         }
 127                         if ((sx + width) & 15)
 128                                 f |= 2;
 129                         w >>= 4;
 130                         for (i = height; i; i--) {
 131                                 src32 = (u32 *)src;
 132                                 dst32 = (u32 *)dst;
 133
 134                                 if (f & 1) {
 135                                         pval[0] = (*src32++ << 8) & mask;
 136                                         pval[1] = (*src32++ << 8) & mask;
 137                                         pval[2] = (*src32++ << 8) & mask;
 138                                         pval[3] = (*src32++ << 8) & mask;
 139                                 } else {
 140                                         pval[0] = dst32[0] & mask;
 141                                         pval[1] = dst32[1] & mask;
 142                                         pval[2] = dst32[2] & mask;
 143                                         pval[3] = dst32[3] & mask;
 144                                 }
 145
 146                                 for (j = w; j > 0; j--) {
 147                                         v = *src32++;
 148                                         v1 = v & mask;
 149                                         *dst32++ = pval[0] | (v1 >> 8);
 150                                         pval[0] = (v ^ v1) << 8;
 151                                         v = *src32++;
 152                                         v1 = v & mask;
 153                                         *dst32++ = pval[1] | (v1 >> 8);
 154                                         pval[1] = (v ^ v1) << 8;
 155                                         v = *src32++;
 156                                         v1 = v & mask;
 157                                         *dst32++ = pval[2] | (v1 >> 8);
 158                                         pval[2] = (v ^ v1) << 8;
 159                                         v = *src32++;
 160                                         v1 = v & mask;
 161                                         *dst32++ = pval[3] | (v1 >> 8);
 162                                         pval[3] = (v ^ v1) << 8;
 163                                 }
 164
 165                                 if (f & 2) {
 166                                         dst32[0] = (dst32[0] & mask) | pval[0];
 167                                         dst32[1] = (dst32[1] & mask) | pval[1];
 168                                         dst32[2] = (dst32[2] & mask) | pval[2];
 169                                         dst32[3] = (dst32[3] & mask) | pval[3];
 170                                 }
 171
 172                                 src += next_line;
 173                                 dst += next_line;
 174                         }
 175                 } else {
 176                         u32 *src32, *dst32;
 177                         u32 pval[4], v, v1, mask;
 178                         int i, j, w, f;
 179
 180                         src = (u8 *)info->screen_base + (sy - 1) * next_line + ((sx + width + 8) & ~15) / (8 / BPL);
 181                         dst = (u8 *)info->screen_base + (dy - 1) * next_line + ((dx + width + 8) & ~15) / (8 / BPL);
 182
 183                         mask = 0xff00ff;
 184                         f = 0;
 185                         w = width;
 186                         if ((dx + width) & 15)
 187                                 f = 1;
 188                         if (sx & 15) {
 189                                 f |= 2;
 190                                 w += 8;
 191                         }
 192                         w >>= 4;
 193                         for (i = height; i; i--) {
 194                                 src32 = (u32 *)src;
 195                                 dst32 = (u32 *)dst;
 196
 197                                 if (f & 1) {
 198                                         pval[0] = dst32[-1] & mask;
 199                                         pval[1] = dst32[-2] & mask;
 200                                         pval[2] = dst32[-3] & mask;
 201                                         pval[3] = dst32[-4] & mask;
 202                                 } else {
 203                                         pval[0] = (*--src32 >> 8) & mask;
 204                                         pval[1] = (*--src32 >> 8) & mask;
 205                                         pval[2] = (*--src32 >> 8) & mask;
 206                                         pval[3] = (*--src32 >> 8) & mask;
 207                                 }
 208
 209                                 for (j = w; j > 0; j--) {
 210                                         v = *--src32;
 211                                         v1 = v & mask;
 212                                         *--dst32 = pval[0] | (v1 << 8);
 213                                         pval[0] = (v ^ v1) >> 8;
 214                                         v = *--src32;
 215                                         v1 = v & mask;
 216                                         *--dst32 = pval[1] | (v1 << 8);
 217                                         pval[1] = (v ^ v1) >> 8;
 218                                         v = *--src32;
 219                                         v1 = v & mask;
 220                                         *--dst32 = pval[2] | (v1 << 8);
 221                                         pval[2] = (v ^ v1) >> 8;
 222                                         v = *--src32;
 223                                         v1 = v & mask;
 224                                         *--dst32 = pval[3] | (v1 << 8);
 225                                         pval[3] = (v ^ v1) >> 8;
 226                                 }
 227
 228                                 if (!(f & 2)) {
 229                                         dst32[-1] = (dst32[-1] & mask) | pval[0];
 230                                         dst32[-2] = (dst32[-2] & mask) | pval[1];
 231                                         dst32[-3] = (dst32[-3] & mask) | pval[2];
 232                                         dst32[-4] = (dst32[-4] & mask) | pval[3];
 233                                 }
 234
 235                                 src -= next_line;
 236                                 dst -= next_line;
 237                         }
 238                 }
 239         }
 240 }
 241
 242 void atafb_iplan2p8_fillrect(struct fb_info *info, u_long next_line, u32 color,
 243                              int sy, int sx, int height, int width)
 244 {
 245         u32 *dest;
 246         int rows, i;
 247         u32 cval[4];
 248
 249         dest = (u32 *)(info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL));
 250         if (sx & 15) {
 251                 u8 *dest8 = (u8 *)dest + 1;
 252
 253                 expand8_col2mask(color, cval);
 254
 255                 for (i = height; i; i--) {
 256                         fill8_col(dest8, cval);
 257                         dest8 += next_line;
 258                 }
 259                 dest += BPL / 2;
 260                 width -= 8;
 261         }
 262
 263         expand16_col2mask(color, cval);
 264         rows = width >> 4;
 265         if (rows) {
 266                 u32 *d = dest;
 267                 u32 off = next_line - rows * BPL * 2;
 268                 for (i = height; i; i--) {
 269                         d = fill16_col(d, rows, cval);
 270                         d = (u32 *)((long)d + off);
 271                 }
 272                 dest += rows * BPL / 2;
 273                 width &= 15;
 274         }
 275
 276         if (width) {
 277                 u8 *dest8 = (u8 *)dest;
 278
 279                 expand8_col2mask(color, cval);
 280
 281                 for (i = height; i; i--) {
 282                         fill8_col(dest8, cval);
 283                         dest8 += next_line;
 284                 }
 285         }
 286 }
 287
 288 void atafb_iplan2p8_linefill(struct fb_info *info, u_long next_line,
 289                              int dy, int dx, u32 width,
 290                              const u8 *data, u32 bgcolor, u32 fgcolor)
 291 {
 292         u32 *dest;
 293         const u16 *data16;
 294         int rows;
 295         u32 fgm[4], bgm[4], m;
 296
 297         dest = (u32 *)(info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL));
 298         if (dx & 15) {
 299                 fill8_2col((u8 *)dest + 1, fgcolor, bgcolor, *data++);
 300                 dest += BPL / 2;
 301                 width -= 8;
 302         }
 303
 304         if (width >= 16) {
 305                 data16 = (const u16 *)data;
 306                 expand16_2col2mask(fgcolor, bgcolor, fgm, bgm);
 307
 308                 for (rows = width / 16; rows; rows--) {
 309                         u16 d = *data16++;
 310                         m = d | ((u32)d << 16);
 311                         *dest++ = (m & fgm[0]) ^ bgm[0];
 312                         *dest++ = (m & fgm[1]) ^ bgm[1];
 313                         *dest++ = (m & fgm[2]) ^ bgm[2];
 314                         *dest++ = (m & fgm[3]) ^ bgm[3];
 315                 }
 316
 317                 data = (const u8 *)data16;
 318                 width &= 15;
 319         }
 320
 321         if (width)
 322                 fill8_2col((u8 *)dest, fgcolor, bgcolor, *data);
 323 }
 324
 325 #ifdef MODULE
 326 MODULE_LICENSE("GPL");
 327
 328 int init_module(void)
 329 {
 330         return 0;
 331 }
 332
 333 void cleanup_module(void)
 334 {
 335 }
 336 #endif /* MODULE */
 337
 338
 339     /*
 340      *  Visible symbols for modules
 341      */
 342
 343 EXPORT_SYMBOL(atafb_iplan2p8_copyarea);
 344 EXPORT_SYMBOL(atafb_iplan2p8_fillrect);
 345 EXPORT_SYMBOL(atafb_iplan2p8_linefill);