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