drivers/video/fbdev/atafb_iplan2p4.c

   1 /*
   2  *  linux/drivers/video/iplan2p4.c -- Low level frame buffer operations for
   3  *                                    interleaved bitplanes à la Atari (4
   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     4
  21 #include "atafb_utils.h"
  22
  23 void atafb_iplan2p4_copyarea(struct fb_info *info, u_long next_line,
  24                              int sy, int sx, int dy, int dx,
  25                              int height, int width)
  26 {
  27         /*  bmove() has to distinguish two major cases: If both, source and
  28          *  destination, start at even addresses or both are at odd
  29          *  addresses, just the first odd and last even column (if present)
  30          *  require special treatment (memmove_col()). The rest between
  31          *  then can be copied by normal operations, because all adjacent
  32          *  bytes are affected and are to be stored in the same order.
  33          *    The pathological case is when the move should go from an odd
  34          *  address to an even or vice versa. Since the bytes in the plane
  35          *  words must be assembled in new order, it seems wisest to make
  36          *  all movements by memmove_col().
  37          */
  38
  39         u8 *src, *dst;
  40         u32 *s, *d;
  41         int w, l , i, j;
  42         u_int colsize;
  43         u_int upwards = (dy < sy) || (dy == sy && dx < sx);
  44
  45         colsize = height;
  46         if (!((sx ^ dx) & 15)) {
  47                 /* odd->odd or even->even */
  48
  49                 if (upwards) {
  50                         src = (u8 *)info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL);
  51                         dst = (u8 *)info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL);
  52                         if (sx & 15) {
  53                                 memmove32_col(dst, src, 0xff00ff, height, next_line - BPL * 2);
  54                                 src += BPL * 2;
  55                                 dst += BPL * 2;
  56                                 width -= 8;
  57                         }
  58                         w = width >> 4;
  59                         if (w) {
  60                                 s = (u32 *)src;
  61                                 d = (u32 *)dst;
  62                                 w *= BPL / 2;
  63                                 l = next_line - w * 4;
  64                                 for (j = height; j > 0; j--) {
  65                                         for (i = w; i > 0; i--)
  66                                                 *d++ = *s++;
  67                                         s = (u32 *)((u8 *)s + l);
  68                                         d = (u32 *)((u8 *)d + l);
  69                                 }
  70                         }
  71                         if (width & 15)
  72                                 memmove32_col(dst + width / (8 / BPL), src + width / (8 / BPL),
  73                                               0xff00ff00, height, next_line - BPL * 2);
  74                 } else {
  75                         src = (u8 *)info->screen_base + (sy - 1) * next_line + ((sx + width + 8) & ~15) / (8 / BPL);
  76                         dst = (u8 *)info->screen_base + (dy - 1) * next_line + ((dx + width + 8) & ~15) / (8 / BPL);
  77
  78                         if ((sx + width) & 15) {
  79                                 src -= BPL * 2;
  80                                 dst -= BPL * 2;
  81                                 memmove32_col(dst, src, 0xff00ff00, colsize, -next_line - BPL * 2);
  82                                 width -= 8;
  83                         }
  84                         w = width >> 4;
  85                         if (w) {
  86                                 s = (u32 *)src;
  87                                 d = (u32 *)dst;
  88                                 w *= BPL / 2;
  89                                 l = next_line - w * 4;
  90                                 for (j = height; j > 0; j--) {
  91                                         for (i = w; i > 0; i--)
  92                                                 *--d = *--s;
  93                                         s = (u32 *)((u8 *)s - l);
  94                                         d = (u32 *)((u8 *)d - l);
  95                                 }
  96                         }
  97                         if (sx & 15)
  98                                 memmove32_col(dst - (width - 16) / (8 / BPL),
  99                                               src - (width - 16) / (8 / BPL),
 100                                               0xff00ff, colsize, -next_line - BPL * 2);
 101                 }
 102         } else {
 103                 /* odd->even or even->odd */
 104                 if (upwards) {
 105                         u32 *src32, *dst32;
 106                         u32 pval[4], v, v1, mask;
 107                         int i, j, w, f;
 108
 109                         src = (u8 *)info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL);
 110                         dst = (u8 *)info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL);
 111
 112                         mask = 0xff00ff00;
 113                         f = 0;
 114                         w = width;
 115                         if (sx & 15) {
 116                                 f = 1;
 117                                 w += 8;
 118                         }
 119                         if ((sx + width) & 15)
 120                                 f |= 2;
 121                         w >>= 4;
 122                         for (i = height; i; i--) {
 123                                 src32 = (u32 *)src;
 124                                 dst32 = (u32 *)dst;
 125
 126                                 if (f & 1) {
 127                                         pval[0] = (*src32++ << 8) & mask;
 128                                         pval[1] = (*src32++ << 8) & mask;
 129                                 } else {
 130                                         pval[0] = dst32[0] & mask;
 131                                         pval[1] = dst32[1] & mask;
 132                                 }
 133
 134                                 for (j = w; j > 0; j--) {
 135                                         v = *src32++;
 136                                         v1 = v & mask;
 137                                         *dst32++ = pval[0] | (v1 >> 8);
 138                                         pval[0] = (v ^ v1) << 8;
 139                                         v = *src32++;
 140                                         v1 = v & mask;
 141                                         *dst32++ = pval[1] | (v1 >> 8);
 142                                         pval[1] = (v ^ v1) << 8;
 143                                 }
 144
 145                                 if (f & 2) {
 146                                         dst32[0] = (dst32[0] & mask) | pval[0];
 147                                         dst32[1] = (dst32[1] & mask) | pval[1];
 148                                 }
 149
 150                                 src += next_line;
 151                                 dst += next_line;
 152                         }
 153                 } else {
 154                         u32 *src32, *dst32;
 155                         u32 pval[4], v, v1, mask;
 156                         int i, j, w, f;
 157
 158                         src = (u8 *)info->screen_base + (sy - 1) * next_line + ((sx + width + 8) & ~15) / (8 / BPL);
 159                         dst = (u8 *)info->screen_base + (dy - 1) * next_line + ((dx + width + 8) & ~15) / (8 / BPL);
 160
 161                         mask = 0xff00ff;
 162                         f = 0;
 163                         w = width;
 164                         if ((dx + width) & 15)
 165                                 f = 1;
 166                         if (sx & 15) {
 167                                 f |= 2;
 168                                 w += 8;
 169                         }
 170                         w >>= 4;
 171                         for (i = height; i; i--) {
 172                                 src32 = (u32 *)src;
 173                                 dst32 = (u32 *)dst;
 174
 175                                 if (f & 1) {
 176                                         pval[0] = dst32[-1] & mask;
 177                                         pval[1] = dst32[-2] & mask;
 178                                 } else {
 179                                         pval[0] = (*--src32 >> 8) & mask;
 180                                         pval[1] = (*--src32 >> 8) & mask;
 181                                 }
 182
 183                                 for (j = w; j > 0; j--) {
 184                                         v = *--src32;
 185                                         v1 = v & mask;
 186                                         *--dst32 = pval[0] | (v1 << 8);
 187                                         pval[0] = (v ^ v1) >> 8;
 188                                         v = *--src32;
 189                                         v1 = v & mask;
 190                                         *--dst32 = pval[1] | (v1 << 8);
 191                                         pval[1] = (v ^ v1) >> 8;
 192                                 }
 193
 194                                 if (!(f & 2)) {
 195                                         dst32[-1] = (dst32[-1] & mask) | pval[0];
 196                                         dst32[-2] = (dst32[-2] & mask) | pval[1];
 197                                 }
 198
 199                                 src -= next_line;
 200                                 dst -= next_line;
 201                         }
 202                 }
 203         }
 204 }
 205
 206 void atafb_iplan2p4_fillrect(struct fb_info *info, u_long next_line, u32 color,
 207                              int sy, int sx, int height, int width)
 208 {
 209         u32 *dest;
 210         int rows, i;
 211         u32 cval[4];
 212
 213         dest = (u32 *)(info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL));
 214         if (sx & 15) {
 215                 u8 *dest8 = (u8 *)dest + 1;
 216
 217                 expand8_col2mask(color, cval);
 218
 219                 for (i = height; i; i--) {
 220                         fill8_col(dest8, cval);
 221                         dest8 += next_line;
 222                 }
 223                 dest += BPL / 2;
 224                 width -= 8;
 225         }
 226
 227         expand16_col2mask(color, cval);
 228         rows = width >> 4;
 229         if (rows) {
 230                 u32 *d = dest;
 231                 u32 off = next_line - rows * BPL * 2;
 232                 for (i = height; i; i--) {
 233                         d = fill16_col(d, rows, cval);
 234                         d = (u32 *)((long)d + off);
 235                 }
 236                 dest += rows * BPL / 2;
 237                 width &= 15;
 238         }
 239
 240         if (width) {
 241                 u8 *dest8 = (u8 *)dest;
 242
 243                 expand8_col2mask(color, cval);
 244
 245                 for (i = height; i; i--) {
 246                         fill8_col(dest8, cval);
 247                         dest8 += next_line;
 248                 }
 249         }
 250 }
 251
 252 void atafb_iplan2p4_linefill(struct fb_info *info, u_long next_line,
 253                              int dy, int dx, u32 width,
 254                              const u8 *data, u32 bgcolor, u32 fgcolor)
 255 {
 256         u32 *dest;
 257         const u16 *data16;
 258         int rows;
 259         u32 fgm[4], bgm[4], m;
 260
 261         dest = (u32 *)(info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL));
 262         if (dx & 15) {
 263                 fill8_2col((u8 *)dest + 1, fgcolor, bgcolor, *data++);
 264                 dest += BPL / 2;
 265                 width -= 8;
 266         }
 267
 268         if (width >= 16) {
 269                 data16 = (const u16 *)data;
 270                 expand16_2col2mask(fgcolor, bgcolor, fgm, bgm);
 271
 272                 for (rows = width / 16; rows; rows--) {
 273                         u16 d = *data16++;
 274                         m = d | ((u32)d << 16);
 275                         *dest++ = (m & fgm[0]) ^ bgm[0];
 276                         *dest++ = (m & fgm[1]) ^ bgm[1];
 277                 }
 278
 279                 data = (const u8 *)data16;
 280                 width &= 15;
 281         }
 282
 283         if (width)
 284                 fill8_2col((u8 *)dest, fgcolor, bgcolor, *data);
 285 }