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   1 /*
   2  *  linux/drivers/video/console/bitblit.c -- BitBlitting Operation
   3  *
   4  *  Originally from the 'accel_*' routines in drivers/video/console/fbcon.c
   5  *
   6  *      Copyright (C) 2004 Antonino Daplas <adaplas @pol.net>
   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/config.h>
  14 #include <linux/module.h>
  15 #include <linux/string.h>
  16 #include <linux/fb.h>
  17 #include <linux/vt_kern.h>
  18 #include <linux/console.h>
  19 #include <asm/types.h>
  20 #include "fbcon.h"
  21
  22 /*
  23  * Accelerated handlers.
  24  */
  25 #define FBCON_ATTRIBUTE_UNDERLINE 1
  26 #define FBCON_ATTRIBUTE_REVERSE   2
  27 #define FBCON_ATTRIBUTE_BOLD      4
  28
  29 static inline int real_y(struct display *p, int ypos)
  30 {
  31         int rows = p->vrows;
  32
  33         ypos += p->yscroll;
  34         return ypos < rows ? ypos : ypos - rows;
  35 }
  36
  37
  38 static inline int get_attribute(struct fb_info *info, u16 c)
  39 {
  40         int attribute = 0;
  41
  42         if (fb_get_color_depth(&info->var, &info->fix) == 1) {
  43                 if (attr_underline(c))
  44                         attribute |= FBCON_ATTRIBUTE_UNDERLINE;
  45                 if (attr_reverse(c))
  46                         attribute |= FBCON_ATTRIBUTE_REVERSE;
  47                 if (attr_bold(c))
  48                         attribute |= FBCON_ATTRIBUTE_BOLD;
  49         }
  50
  51         return attribute;
  52 }
  53
  54 static inline void update_attr(u8 *dst, u8 *src, int attribute,
  55                                struct vc_data *vc)
  56 {
  57         int i, offset = (vc->vc_font.height < 10) ? 1 : 2;
  58         int width = (vc->vc_font.width + 7) >> 3;
  59         unsigned int cellsize = vc->vc_font.height * width;
  60         u8 c;
  61
  62         offset = cellsize - (offset * width);
  63         for (i = 0; i < cellsize; i++) {
  64                 c = src[i];
  65                 if (attribute & FBCON_ATTRIBUTE_UNDERLINE && i >= offset)
  66                         c = 0xff;
  67                 if (attribute & FBCON_ATTRIBUTE_BOLD)
  68                         c |= c >> 1;
  69                 if (attribute & FBCON_ATTRIBUTE_REVERSE)
  70                         c = ~c;
  71                 dst[i] = c;
  72         }
  73 }
  74
  75 static void bit_bmove(struct vc_data *vc, struct fb_info *info, int sy,
  76                       int sx, int dy, int dx, int height, int width)
  77 {
  78         struct fb_copyarea area;
  79
  80         area.sx = sx * vc->vc_font.width;
  81         area.sy = sy * vc->vc_font.height;
  82         area.dx = dx * vc->vc_font.width;
  83         area.dy = dy * vc->vc_font.height;
  84         area.height = height * vc->vc_font.height;
  85         area.width = width * vc->vc_font.width;
  86
  87         info->fbops->fb_copyarea(info, &area);
  88 }
  89
  90 static void bit_clear(struct vc_data *vc, struct fb_info *info, int sy,
  91                       int sx, int height, int width)
  92 {
  93         int bgshift = (vc->vc_hi_font_mask) ? 13 : 12;
  94         struct fb_fillrect region;
  95
  96         region.color = attr_bgcol_ec(bgshift, vc);
  97         region.dx = sx * vc->vc_font.width;
  98         region.dy = sy * vc->vc_font.height;
  99         region.width = width * vc->vc_font.width;
 100         region.height = height * vc->vc_font.height;
 101         region.rop = ROP_COPY;
 102
 103         info->fbops->fb_fillrect(info, &region);
 104 }
 105
 106 static void bit_putcs(struct vc_data *vc, struct fb_info *info,
 107                       const unsigned short *s, int count, int yy, int xx,
 108                       int fg, int bg)
 109 {
 110         unsigned short charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
 111         unsigned int width = (vc->vc_font.width + 7) >> 3;
 112         unsigned int cellsize = vc->vc_font.height * width;
 113         unsigned int maxcnt = info->pixmap.size/cellsize;
 114         unsigned int scan_align = info->pixmap.scan_align - 1;
 115         unsigned int buf_align = info->pixmap.buf_align - 1;
 116         unsigned int shift_low = 0, mod = vc->vc_font.width % 8;
 117         unsigned int shift_high = 8, pitch, cnt, size, i, k;
 118         unsigned int idx = vc->vc_font.width >> 3;
 119         unsigned int attribute = get_attribute(info, scr_readw(s));
 120         struct fb_image image;
 121         u8 *src, *dst, *buf = NULL;
 122
 123         if (attribute) {
 124                 buf = kmalloc(cellsize, GFP_KERNEL);
 125                 if (!buf)
 126                         return;
 127         }
 128
 129         image.fg_color = fg;
 130         image.bg_color = bg;
 131
 132         image.dx = xx * vc->vc_font.width;
 133         image.dy = yy * vc->vc_font.height;
 134         image.height = vc->vc_font.height;
 135         image.depth = 1;
 136
 137         while (count) {
 138                 if (count > maxcnt)
 139                         cnt = k = maxcnt;
 140                 else
 141                         cnt = k = count;
 142
 143                 image.width = vc->vc_font.width * cnt;
 144                 pitch = ((image.width + 7) >> 3) + scan_align;
 145                 pitch &= ~scan_align;
 146                 size = pitch * image.height + buf_align;
 147                 size &= ~buf_align;
 148                 dst = fb_get_buffer_offset(info, &info->pixmap, size);
 149                 image.data = dst;
 150                 if (mod) {
 151                         while (k--) {
 152                                 src = vc->vc_font.data + (scr_readw(s++)&
 153                                                           charmask)*cellsize;
 154
 155                                 if (attribute) {
 156                                         update_attr(buf, src, attribute, vc);
 157                                         src = buf;
 158                                 }
 159
 160                                 fb_pad_unaligned_buffer(dst, pitch, src, idx,
 161                                                 image.height, shift_high,
 162                                                 shift_low, mod);
 163                                 shift_low += mod;
 164                                 dst += (shift_low >= 8) ? width : width - 1;
 165                                 shift_low &= 7;
 166                                 shift_high = 8 - shift_low;
 167                         }
 168                 } else {
 169                         while (k--) {
 170                                 src = vc->vc_font.data + (scr_readw(s++)&
 171                                                           charmask)*cellsize;
 172
 173                                 if (attribute) {
 174                                         update_attr(buf, src, attribute, vc);
 175                                         src = buf;
 176                                 }
 177
 178                                 if (idx == 1)
 179                                         for(i=0; i < image.height; i++)
 180                                                 dst[pitch*i] = src[i];
 181                                 else
 182                                         fb_pad_aligned_buffer(dst, pitch, src, idx, image.height);
 183                                 dst += width;
 184                         }
 185                 }
 186                 info->fbops->fb_imageblit(info, &image);
 187                 image.dx += cnt * vc->vc_font.width;
 188                 count -= cnt;
 189         }
 190
 191         /* buf is always NULL except when in monochrome mode, so in this case
 192            it's a gain to check buf against NULL even though kfree() handles
 193            NULL pointers just fine */
 194         if (unlikely(buf))
 195                 kfree(buf);
 196 }
 197
 198 static void bit_clear_margins(struct vc_data *vc, struct fb_info *info,
 199                               int bottom_only)
 200 {
 201         int bgshift = (vc->vc_hi_font_mask) ? 13 : 12;
 202         unsigned int cw = vc->vc_font.width;
 203         unsigned int ch = vc->vc_font.height;
 204         unsigned int rw = info->var.xres - (vc->vc_cols*cw);
 205         unsigned int bh = info->var.yres - (vc->vc_rows*ch);
 206         unsigned int rs = info->var.xres - rw;
 207         unsigned int bs = info->var.yres - bh;
 208         struct fb_fillrect region;
 209
 210         region.color = attr_bgcol_ec(bgshift, vc);
 211         region.rop = ROP_COPY;
 212
 213         if (rw && !bottom_only) {
 214                 region.dx = info->var.xoffset + rs;
 215                 region.dy = 0;
 216                 region.width = rw;
 217                 region.height = info->var.yres_virtual;
 218                 info->fbops->fb_fillrect(info, &region);
 219         }
 220
 221         if (bh) {
 222                 region.dx = info->var.xoffset;
 223                 region.dy = info->var.yoffset + bs;
 224                 region.width = rs;
 225                 region.height = bh;
 226                 info->fbops->fb_fillrect(info, &region);
 227         }
 228 }
 229
 230 static void bit_cursor(struct vc_data *vc, struct fb_info *info,
 231                        struct display *p, int mode, int softback_lines, int fg, int bg)
 232 {
 233         struct fb_cursor cursor;
 234         struct fbcon_ops *ops = (struct fbcon_ops *) info->fbcon_par;
 235         unsigned short charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
 236         int w = (vc->vc_font.width + 7) >> 3, c;
 237         int y = real_y(p, vc->vc_y);
 238         int attribute, use_sw = (vc->vc_cursor_type & 0x10);
 239         char *src;
 240
 241         cursor.set = 0;
 242
 243         if (softback_lines) {
 244                 if (y + softback_lines >= vc->vc_rows) {
 245                         mode = CM_ERASE;
 246                         ops->cursor_flash = 0;
 247                         return;
 248                 } else
 249                         y += softback_lines;
 250         }
 251
 252         c = scr_readw((u16 *) vc->vc_pos);
 253         attribute = get_attribute(info, c);
 254         src = vc->vc_font.data + ((c & charmask) * (w * vc->vc_font.height));
 255
 256         if (ops->cursor_state.image.data != src ||
 257             ops->cursor_reset) {
 258             ops->cursor_state.image.data = src;
 259             cursor.set |= FB_CUR_SETIMAGE;
 260         }
 261
 262         if (attribute) {
 263                 u8 *dst;
 264
 265                 dst = kmalloc(w * vc->vc_font.height, GFP_ATOMIC);
 266                 if (!dst)
 267                         return;
 268                 kfree(ops->cursor_data);
 269                 ops->cursor_data = dst;
 270                 update_attr(dst, src, attribute, vc);
 271                 src = dst;
 272         }
 273
 274         if (ops->cursor_state.image.fg_color != fg ||
 275             ops->cursor_state.image.bg_color != bg ||
 276             ops->cursor_reset) {
 277                 ops->cursor_state.image.fg_color = fg;
 278                 ops->cursor_state.image.bg_color = bg;
 279                 cursor.set |= FB_CUR_SETCMAP;
 280         }
 281
 282         if ((ops->cursor_state.image.dx != (vc->vc_font.width * vc->vc_x)) ||
 283             (ops->cursor_state.image.dy != (vc->vc_font.height * y)) ||
 284             ops->cursor_reset) {
 285                 ops->cursor_state.image.dx = vc->vc_font.width * vc->vc_x;
 286                 ops->cursor_state.image.dy = vc->vc_font.height * y;
 287                 cursor.set |= FB_CUR_SETPOS;
 288         }
 289
 290         if (ops->cursor_state.image.height != vc->vc_font.height ||
 291             ops->cursor_state.image.width != vc->vc_font.width ||
 292             ops->cursor_reset) {
 293                 ops->cursor_state.image.height = vc->vc_font.height;
 294                 ops->cursor_state.image.width = vc->vc_font.width;
 295                 cursor.set |= FB_CUR_SETSIZE;
 296         }
 297
 298         if (ops->cursor_state.hot.x || ops->cursor_state.hot.y ||
 299             ops->cursor_reset) {
 300                 ops->cursor_state.hot.x = cursor.hot.y = 0;
 301                 cursor.set |= FB_CUR_SETHOT;
 302         }
 303
 304         if (cursor.set & FB_CUR_SETSIZE ||
 305             vc->vc_cursor_type != p->cursor_shape ||
 306             ops->cursor_state.mask == NULL ||
 307             ops->cursor_reset) {
 308                 char *mask = kmalloc(w*vc->vc_font.height, GFP_ATOMIC);
 309                 int cur_height, size, i = 0;
 310                 u8 msk = 0xff;
 311
 312                 if (!mask)
 313                         return;
 314
 315                 kfree(ops->cursor_state.mask);
 316                 ops->cursor_state.mask = mask;
 317
 318                 p->cursor_shape = vc->vc_cursor_type;
 319                 cursor.set |= FB_CUR_SETSHAPE;
 320
 321                 switch (p->cursor_shape & CUR_HWMASK) {
 322                 case CUR_NONE:
 323                         cur_height = 0;
 324                         break;
 325                 case CUR_UNDERLINE:
 326                         cur_height = (vc->vc_font.height < 10) ? 1 : 2;
 327                         break;
 328                 case CUR_LOWER_THIRD:
 329                         cur_height = vc->vc_font.height/3;
 330                         break;
 331                 case CUR_LOWER_HALF:
 332                         cur_height = vc->vc_font.height >> 1;
 333                         break;
 334                 case CUR_TWO_THIRDS:
 335                         cur_height = (vc->vc_font.height << 1)/3;
 336                         break;
 337                 case CUR_BLOCK:
 338                 default:
 339                         cur_height = vc->vc_font.height;
 340                         break;
 341                 }
 342                 size = (vc->vc_font.height - cur_height) * w;
 343                 while (size--)
 344                         mask[i++] = ~msk;
 345                 size = cur_height * w;
 346                 while (size--)
 347                         mask[i++] = msk;
 348         }
 349
 350         switch (mode) {
 351         case CM_ERASE:
 352                 ops->cursor_state.enable = 0;
 353                 break;
 354         case CM_DRAW:
 355         case CM_MOVE:
 356         default:
 357                 ops->cursor_state.enable = (use_sw) ? 0 : 1;
 358                 break;
 359         }
 360
 361         cursor.image.data = src;
 362         cursor.image.fg_color = ops->cursor_state.image.fg_color;
 363         cursor.image.bg_color = ops->cursor_state.image.bg_color;
 364         cursor.image.dx = ops->cursor_state.image.dx;
 365         cursor.image.dy = ops->cursor_state.image.dy;
 366         cursor.image.height = ops->cursor_state.image.height;
 367         cursor.image.width = ops->cursor_state.image.width;
 368         cursor.hot.x = ops->cursor_state.hot.x;
 369         cursor.hot.y = ops->cursor_state.hot.y;
 370         cursor.mask = ops->cursor_state.mask;
 371         cursor.enable = ops->cursor_state.enable;
 372         cursor.image.depth = 1;
 373         cursor.rop = ROP_XOR;
 374
 375         info->fbops->fb_cursor(info, &cursor);
 376
 377         ops->cursor_reset = 0;
 378 }
 379
 380 void fbcon_set_bitops(struct fbcon_ops *ops)
 381 {
 382         ops->bmove = bit_bmove;
 383         ops->clear = bit_clear;
 384         ops->putcs = bit_putcs;
 385         ops->clear_margins = bit_clear_margins;
 386         ops->cursor = bit_cursor;
 387 }
 388
 389 EXPORT_SYMBOL(fbcon_set_bitops);
 390
 391 MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>");
 392 MODULE_DESCRIPTION("Bit Blitting Operation");
 393 MODULE_LICENSE("GPL");
 394