drivers/video/atafb_iplan2p2.c

   1 /*
   2  *  linux/drivers/video/iplan2p2.c -- Low level frame buffer operations for
   3  *                                    interleaved bitplanes à la Atari (2
   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     2
  22 #include "atafb_utils.h"
  23
  24 void atafb_iplan2p2_copyarea(struct fb_info *info, u_long next_line,
  25                              int sy, int sx, int dy, int dx,
  26                              int height, int width)
  27 {
  28         /*  bmove() has to distinguish two major cases: If both, source and
  29          *  destination, start at even addresses or both are at odd
  30          *  addresses, just the first odd and last even column (if present)
  31          *  require special treatment (memmove_col()). The rest between
  32          *  then can be copied by normal operations, because all adjacent
  33          *  bytes are affected and are to be stored in the same order.
  34          *    The pathological case is when the move should go from an odd
  35          *  address to an even or vice versa. Since the bytes in the plane
  36          *  words must be assembled in new order, it seems wisest to make
  37          *  all movements by memmove_col().
  38          */
  39
  40         u8 *src, *dst;
  41         u32 *s, *d;
  42         int w, l , i, j;
  43         u_int colsize;
  44         u_int upwards = (dy < sy) || (dy == sy && dx < sx);
  45
  46         colsize = height;
  47         if (!((sx ^ dx) & 15)) {
  48                 /* odd->odd or even->even */
  49
  50                 if (upwards) {
  51                         src = (u8 *)info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL);
  52                         dst = (u8 *)info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL);
  53                         if (sx & 15) {
  54                                 memmove32_col(dst, src, 0xff00ff, height, next_line - BPL * 2);
  55                                 src += BPL * 2;
  56                                 dst += BPL * 2;
  57                                 width -= 8;
  58                         }
  59                         w = width >> 4;
  60                         if (w) {
  61                                 s = (u32 *)src;
  62                                 d = (u32 *)dst;
  63                                 w *= BPL / 2;
  64                                 l = next_line - w * 4;
  65                                 for (j = height; j > 0; j--) {
  66                                         for (i = w; i > 0; i--)
  67                                                 *d++ = *s++;
  68                                         s = (u32 *)((u8 *)s + l);
  69                                         d = (u32 *)((u8 *)d + l);
  70                                 }
  71                         }
  72                         if (width & 15)
  73                                 memmove32_col(dst + width / (8 / BPL), src + width / (8 / BPL),
  74                                               0xff00ff00, height, next_line - BPL * 2);
  75                 } else {
  76                         src = (u8 *)info->screen_base + (sy - 1) * next_line + ((sx + width + 8) & ~15) / (8 / BPL);
  77                         dst = (u8 *)info->screen_base + (dy - 1) * next_line + ((dx + width + 8) & ~15) / (8 / BPL);
  78
  79                         if ((sx + width) & 15) {
  80                                 src -= BPL * 2;
  81                                 dst -= BPL * 2;
  82                                 memmove32_col(dst, src, 0xff00ff00, colsize, -next_line - BPL * 2);
  83                                 width -= 8;
  84                         }
  85                         w = width >> 4;
  86                         if (w) {
  87                                 s = (u32 *)src;
  88                                 d = (u32 *)dst;
  89                                 w *= BPL / 2;
  90                                 l = next_line - w * 4;
  91                                 for (j = height; j > 0; j--) {
  92                                         for (i = w; i > 0; i--)
  93                                                 *--d = *--s;
  94                                         s = (u32 *)((u8 *)s - l);
  95                                         d = (u32 *)((u8 *)d - l);
  96                                 }
  97                         }
  98                         if (sx & 15)
  99                                 memmove32_col(dst - (width - 16) / (8 / BPL),
 100                                               src - (width - 16) / (8 / BPL),
 101                                               0xff00ff, colsize, -next_line - BPL * 2);
 102                 }
 103         } else {
 104                 /* odd->even or even->odd */
 105                 if (upwards) {
 106                         u32 *src32, *dst32;
 107                         u32 pval[4], v, v1, mask;
 108                         int i, j, w, f;
 109
 110                         src = (u8 *)info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL);
 111                         dst = (u8 *)info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL);
 112
 113                         mask = 0xff00ff00;
 114                         f = 0;
 115                         w = width;
 116                         if (sx & 15) {
 117                                 f = 1;
 118                                 w += 8;
 119                         }
 120                         if ((sx + width) & 15)
 121                                 f |= 2;
 122                         w >>= 4;
 123                         for (i = height; i; i--) {
 124                                 src32 = (u32 *)src;
 125                                 dst32 = (u32 *)dst;
 126
 127                                 if (f & 1) {
 128                                         pval[0] = (*src32++ << 8) & mask;
 129                                 } else {
 130                                         pval[0] = dst32[0] & mask;
 131                                 }
 132
 133                                 for (j = w; j > 0; j--) {
 134                                         v = *src32++;
 135                                         v1 = v & mask;
 136                                         *dst32++ = pval[0] | (v1 >> 8);
 137                                         pval[0] = (v ^ v1) << 8;
 138                                 }
 139
 140                                 if (f & 2) {
 141                                         dst32[0] = (dst32[0] & mask) | pval[0];
 142                                 }
 143
 144                                 src += next_line;
 145                                 dst += next_line;
 146                         }
 147                 } else {
 148                         u32 *src32, *dst32;
 149                         u32 pval[4], v, v1, mask;
 150                         int i, j, w, f;
 151
 152                         src = (u8 *)info->screen_base + (sy - 1) * next_line + ((sx + width + 8) & ~15) / (8 / BPL);
 153                         dst = (u8 *)info->screen_base + (dy - 1) * next_line + ((dx + width + 8) & ~15) / (8 / BPL);
 154
 155                         mask = 0xff00ff;
 156                         f = 0;
 157                         w = width;
 158                         if ((dx + width) & 15)
 159                                 f = 1;
 160                         if (sx & 15) {
 161                                 f |= 2;
 162                                 w += 8;
 163                         }
 164                         w >>= 4;
 165                         for (i = height; i; i--) {
 166                                 src32 = (u32 *)src;
 167                                 dst32 = (u32 *)dst;
 168
 169                                 if (f & 1) {
 170                                         pval[0] = dst32[-1] & mask;
 171                                 } else {
 172                                         pval[0] = (*--src32 >> 8) & mask;
 173                                 }
 174
 175                                 for (j = w; j > 0; j--) {
 176                                         v = *--src32;
 177                                         v1 = v & mask;
 178                                         *--dst32 = pval[0] | (v1 << 8);
 179                                         pval[0] = (v ^ v1) >> 8;
 180                                 }
 181
 182                                 if (!(f & 2)) {
 183                                         dst32[-1] = (dst32[-1] & mask) | pval[0];
 184                                 }
 185
 186                                 src -= next_line;
 187                                 dst -= next_line;
 188                         }
 189                 }
 190         }
 191 }
 192
 193 void atafb_iplan2p2_fillrect(struct fb_info *info, u_long next_line, u32 color,
 194                              int sy, int sx, int height, int width)
 195 {
 196         u32 *dest;
 197         int rows, i;
 198         u32 cval[4];
 199
 200         dest = (u32 *)(info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL));
 201         if (sx & 15) {
 202                 u8 *dest8 = (u8 *)dest + 1;
 203
 204                 expand8_col2mask(color, cval);
 205
 206                 for (i = height; i; i--) {
 207                         fill8_col(dest8, cval);
 208                         dest8 += next_line;
 209                 }
 210                 dest += BPL / 2;
 211                 width -= 8;
 212         }
 213
 214         expand16_col2mask(color, cval);
 215         rows = width >> 4;
 216         if (rows) {
 217                 u32 *d = dest;
 218                 u32 off = next_line - rows * BPL * 2;
 219                 for (i = height; i; i--) {
 220                         d = fill16_col(d, rows, cval);
 221                         d = (u32 *)((long)d + off);
 222                 }
 223                 dest += rows * BPL / 2;
 224                 width &= 15;
 225         }
 226
 227         if (width) {
 228                 u8 *dest8 = (u8 *)dest;
 229
 230                 expand8_col2mask(color, cval);
 231
 232                 for (i = height; i; i--) {
 233                         fill8_col(dest8, cval);
 234                         dest8 += next_line;
 235                 }
 236         }
 237 }
 238
 239 void atafb_iplan2p2_linefill(struct fb_info *info, u_long next_line,
 240                              int dy, int dx, u32 width,
 241                              const u8 *data, u32 bgcolor, u32 fgcolor)
 242 {
 243         u32 *dest;
 244         const u16 *data16;
 245         int rows;
 246         u32 fgm[4], bgm[4], m;
 247
 248         dest = (u32 *)(info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL));
 249         if (dx & 15) {
 250                 fill8_2col((u8 *)dest + 1, fgcolor, bgcolor, *data++);
 251                 dest += BPL / 2;
 252                 width -= 8;
 253         }
 254
 255         if (width >= 16) {
 256                 data16 = (const u16 *)data;
 257                 expand16_2col2mask(fgcolor, bgcolor, fgm, bgm);
 258
 259                 for (rows = width / 16; rows; rows--) {
 260                         u16 d = *data16++;
 261                         m = d | ((u32)d << 16);
 262                         *dest++ = (m & fgm[0]) ^ bgm[0];
 263                 }
 264
 265                 data = (const u8 *)data16;
 266                 width &= 15;
 267         }
 268
 269         if (width)
 270                 fill8_2col((u8 *)dest, fgcolor, bgcolor, *data);
 271 }
 272
 273 #ifdef MODULE
 274 MODULE_LICENSE("GPL");
 275
 276 int init_module(void)
 277 {
 278         return 0;
 279 }
 280
 281 void cleanup_module(void)
 282 {
 283 }
 284 #endif /* MODULE */
 285
 286
 287     /*
 288      *  Visible symbols for modules
 289      */
 290
 291 EXPORT_SYMBOL(atafb_iplan2p2_copyarea);
 292 EXPORT_SYMBOL(atafb_iplan2p2_fillrect);
 293 EXPORT_SYMBOL(atafb_iplan2p2_linefill);