drivers/video/fbdev/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/string.h>
  14 #include <linux/fb.h>
  15
  16 #include <asm/setup.h>
  17
  18 #include "atafb.h"
  19
  20 #define BPL     2
  21 #include "atafb_utils.h"
  22
  23 void atafb_iplan2p2_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                                 } else {
 129                                         pval[0] = dst32[0] & mask;
 130                                 }
 131
 132                                 for (j = w; j > 0; j--) {
 133                                         v = *src32++;
 134                                         v1 = v & mask;
 135                                         *dst32++ = pval[0] | (v1 >> 8);
 136                                         pval[0] = (v ^ v1) << 8;
 137                                 }
 138
 139                                 if (f & 2) {
 140                                         dst32[0] = (dst32[0] & mask) | pval[0];
 141                                 }
 142
 143                                 src += next_line;
 144                                 dst += next_line;
 145                         }
 146                 } else {
 147                         u32 *src32, *dst32;
 148                         u32 pval[4], v, v1, mask;
 149                         int i, j, w, f;
 150
 151                         src = (u8 *)info->screen_base + (sy - 1) * next_line + ((sx + width + 8) & ~15) / (8 / BPL);
 152                         dst = (u8 *)info->screen_base + (dy - 1) * next_line + ((dx + width + 8) & ~15) / (8 / BPL);
 153
 154                         mask = 0xff00ff;
 155                         f = 0;
 156                         w = width;
 157                         if ((dx + width) & 15)
 158                                 f = 1;
 159                         if (sx & 15) {
 160                                 f |= 2;
 161                                 w += 8;
 162                         }
 163                         w >>= 4;
 164                         for (i = height; i; i--) {
 165                                 src32 = (u32 *)src;
 166                                 dst32 = (u32 *)dst;
 167
 168                                 if (f & 1) {
 169                                         pval[0] = dst32[-1] & mask;
 170                                 } else {
 171                                         pval[0] = (*--src32 >> 8) & mask;
 172                                 }
 173
 174                                 for (j = w; j > 0; j--) {
 175                                         v = *--src32;
 176                                         v1 = v & mask;
 177                                         *--dst32 = pval[0] | (v1 << 8);
 178                                         pval[0] = (v ^ v1) >> 8;
 179                                 }
 180
 181                                 if (!(f & 2)) {
 182                                         dst32[-1] = (dst32[-1] & mask) | pval[0];
 183                                 }
 184
 185                                 src -= next_line;
 186                                 dst -= next_line;
 187                         }
 188                 }
 189         }
 190 }
 191
 192 void atafb_iplan2p2_fillrect(struct fb_info *info, u_long next_line, u32 color,
 193                              int sy, int sx, int height, int width)
 194 {
 195         u32 *dest;
 196         int rows, i;
 197         u32 cval[4];
 198
 199         dest = (u32 *)(info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL));
 200         if (sx & 15) {
 201                 u8 *dest8 = (u8 *)dest + 1;
 202
 203                 expand8_col2mask(color, cval);
 204
 205                 for (i = height; i; i--) {
 206                         fill8_col(dest8, cval);
 207                         dest8 += next_line;
 208                 }
 209                 dest += BPL / 2;
 210                 width -= 8;
 211         }
 212
 213         expand16_col2mask(color, cval);
 214         rows = width >> 4;
 215         if (rows) {
 216                 u32 *d = dest;
 217                 u32 off = next_line - rows * BPL * 2;
 218                 for (i = height; i; i--) {
 219                         d = fill16_col(d, rows, cval);
 220                         d = (u32 *)((long)d + off);
 221                 }
 222                 dest += rows * BPL / 2;
 223                 width &= 15;
 224         }
 225
 226         if (width) {
 227                 u8 *dest8 = (u8 *)dest;
 228
 229                 expand8_col2mask(color, cval);
 230
 231                 for (i = height; i; i--) {
 232                         fill8_col(dest8, cval);
 233                         dest8 += next_line;
 234                 }
 235         }
 236 }
 237
 238 void atafb_iplan2p2_linefill(struct fb_info *info, u_long next_line,
 239                              int dy, int dx, u32 width,
 240                              const u8 *data, u32 bgcolor, u32 fgcolor)
 241 {
 242         u32 *dest;
 243         const u16 *data16;
 244         int rows;
 245         u32 fgm[4], bgm[4], m;
 246
 247         dest = (u32 *)(info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL));
 248         if (dx & 15) {
 249                 fill8_2col((u8 *)dest + 1, fgcolor, bgcolor, *data++);
 250                 dest += BPL / 2;
 251                 width -= 8;
 252         }
 253
 254         if (width >= 16) {
 255                 data16 = (const u16 *)data;
 256                 expand16_2col2mask(fgcolor, bgcolor, fgm, bgm);
 257
 258                 for (rows = width / 16; rows; rows--) {
 259                         u16 d = *data16++;
 260                         m = d | ((u32)d << 16);
 261                         *dest++ = (m & fgm[0]) ^ bgm[0];
 262                 }
 263
 264                 data = (const u8 *)data16;
 265                 width &= 15;
 266         }
 267
 268         if (width)
 269                 fill8_2col((u8 *)dest, fgcolor, bgcolor, *data);
 270 }