drivers/video/console/bitblit.c

   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) == 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         void (*move_unaligned)(struct fb_info *info, struct fb_pixmap *buf,
 111                                u8 *dst, u32 d_pitch, u8 *src, u32 idx,
 112                                u32 height, u32 shift_high, u32 shift_low,
 113                                u32 mod);
 114         void (*move_aligned)(struct fb_info *info, struct fb_pixmap *buf,
 115                              u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch,
 116                              u32 height);
 117         unsigned short charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
 118         unsigned int width = (vc->vc_font.width + 7) >> 3;
 119         unsigned int cellsize = vc->vc_font.height * width;
 120         unsigned int maxcnt = info->pixmap.size/cellsize;
 121         unsigned int scan_align = info->pixmap.scan_align - 1;
 122         unsigned int buf_align = info->pixmap.buf_align - 1;
 123         unsigned int shift_low = 0, mod = vc->vc_font.width % 8;
 124         unsigned int shift_high = 8, pitch, cnt, size, k;
 125         unsigned int idx = vc->vc_font.width >> 3;
 126         unsigned int attribute = get_attribute(info, scr_readw(s));
 127         struct fb_image image;
 128         u8 *src, *dst, *buf = NULL;
 129
 130         if (attribute) {
 131                 buf = kmalloc(cellsize, GFP_KERNEL);
 132                 if (!buf)
 133                         return;
 134         }
 135
 136         image.fg_color = fg;
 137         image.bg_color = bg;
 138
 139         image.dx = xx * vc->vc_font.width;
 140         image.dy = yy * vc->vc_font.height;
 141         image.height = vc->vc_font.height;
 142         image.depth = 1;
 143
 144         if (info->pixmap.outbuf && info->pixmap.inbuf) {
 145                 move_aligned = fb_iomove_buf_aligned;
 146                 move_unaligned = fb_iomove_buf_unaligned;
 147         } else {
 148                 move_aligned = fb_sysmove_buf_aligned;
 149                 move_unaligned = fb_sysmove_buf_unaligned;
 150         }
 151         while (count) {
 152                 if (count > maxcnt)
 153                         cnt = k = maxcnt;
 154                 else
 155                         cnt = k = count;
 156
 157                 image.width = vc->vc_font.width * cnt;
 158                 pitch = ((image.width + 7) >> 3) + scan_align;
 159                 pitch &= ~scan_align;
 160                 size = pitch * image.height + buf_align;
 161                 size &= ~buf_align;
 162                 dst = fb_get_buffer_offset(info, &info->pixmap, size);
 163                 image.data = dst;
 164                 if (mod) {
 165                         while (k--) {
 166                                 src = vc->vc_font.data + (scr_readw(s++)&
 167                                                           charmask)*cellsize;
 168
 169                                 if (attribute) {
 170                                         update_attr(buf, src, attribute, vc);
 171                                         src = buf;
 172                                 }
 173
 174                                 move_unaligned(info, &info->pixmap, dst, pitch,
 175                                                src, idx, image.height,
 176                                                shift_high, shift_low, mod);
 177                                 shift_low += mod;
 178                                 dst += (shift_low >= 8) ? width : width - 1;
 179                                 shift_low &= 7;
 180                                 shift_high = 8 - shift_low;
 181                         }
 182                 } else {
 183                         while (k--) {
 184                                 src = vc->vc_font.data + (scr_readw(s++)&
 185                                                           charmask)*cellsize;
 186
 187                                 if (attribute) {
 188                                         update_attr(buf, src, attribute, vc);
 189                                         src = buf;
 190                                 }
 191
 192                                 move_aligned(info, &info->pixmap, dst, pitch,
 193                                              src, idx, image.height);
 194                                 dst += width;
 195                         }
 196                 }
 197                 info->fbops->fb_imageblit(info, &image);
 198                 image.dx += cnt * vc->vc_font.width;
 199                 count -= cnt;
 200         }
 201
 202         /* buf is always NULL except when in monochrome mode, so in this case
 203            it's a gain to check buf against NULL even though kfree() handles
 204            NULL pointers just fine */
 205         if (unlikely(buf))
 206                 kfree(buf);
 207 }
 208
 209 static void bit_clear_margins(struct vc_data *vc, struct fb_info *info,
 210                               int bottom_only)
 211 {
 212         int bgshift = (vc->vc_hi_font_mask) ? 13 : 12;
 213         unsigned int cw = vc->vc_font.width;
 214         unsigned int ch = vc->vc_font.height;
 215         unsigned int rw = info->var.xres - (vc->vc_cols*cw);
 216         unsigned int bh = info->var.yres - (vc->vc_rows*ch);
 217         unsigned int rs = info->var.xres - rw;
 218         unsigned int bs = info->var.yres - bh;
 219         struct fb_fillrect region;
 220
 221         region.color = attr_bgcol_ec(bgshift, vc);
 222         region.rop = ROP_COPY;
 223
 224         if (rw && !bottom_only) {
 225                 region.dx = info->var.xoffset + rs;
 226                 region.dy = 0;
 227                 region.width = rw;
 228                 region.height = info->var.yres_virtual;
 229                 info->fbops->fb_fillrect(info, &region);
 230         }
 231
 232         if (bh) {
 233                 region.dx = info->var.xoffset;
 234                 region.dy = info->var.yoffset + bs;
 235                 region.width = rs;
 236                 region.height = bh;
 237                 info->fbops->fb_fillrect(info, &region);
 238         }
 239 }
 240
 241 static void bit_cursor(struct vc_data *vc, struct fb_info *info,
 242                        struct display *p, int mode, int softback_lines, int fg, int bg)
 243 {
 244         struct fb_cursor cursor;
 245         struct fbcon_ops *ops = (struct fbcon_ops *) info->fbcon_par;
 246         unsigned short charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
 247         int w = (vc->vc_font.width + 7) >> 3, c;
 248         int y = real_y(p, vc->vc_y);
 249         int attribute, use_sw = (vc->vc_cursor_type & 0x10);
 250         char *src;
 251
 252         cursor.set = 0;
 253
 254         if (softback_lines) {
 255                 if (y + softback_lines >= vc->vc_rows) {
 256                         mode = CM_ERASE;
 257                         ops->cursor_flash = 0;
 258                         return;
 259                 } else
 260                         y += softback_lines;
 261         }
 262
 263         c = scr_readw((u16 *) vc->vc_pos);
 264         attribute = get_attribute(info, c);
 265         src = vc->vc_font.data + ((c & charmask) * (w * vc->vc_font.height));
 266
 267         if (ops->cursor_state.image.data != src ||
 268             ops->cursor_reset) {
 269             ops->cursor_state.image.data = src;
 270             cursor.set |= FB_CUR_SETIMAGE;
 271         }
 272
 273         if (attribute) {
 274                 u8 *dst;
 275
 276                 dst = kmalloc(w * vc->vc_font.height, GFP_ATOMIC);
 277                 if (!dst)
 278                         return;
 279                 kfree(ops->cursor_data);
 280                 ops->cursor_data = dst;
 281                 update_attr(dst, src, attribute, vc);
 282                 src = dst;
 283         }
 284
 285         if (ops->cursor_state.image.fg_color != fg ||
 286             ops->cursor_state.image.bg_color != bg ||
 287             ops->cursor_reset) {
 288                 ops->cursor_state.image.fg_color = fg;
 289                 ops->cursor_state.image.bg_color = bg;
 290                 cursor.set |= FB_CUR_SETCMAP;
 291         }
 292
 293         if ((ops->cursor_state.image.dx != (vc->vc_font.width * vc->vc_x)) ||
 294             (ops->cursor_state.image.dy != (vc->vc_font.height * y)) ||
 295             ops->cursor_reset) {
 296                 ops->cursor_state.image.dx = vc->vc_font.width * vc->vc_x;
 297                 ops->cursor_state.image.dy = vc->vc_font.height * y;
 298                 cursor.set |= FB_CUR_SETPOS;
 299         }
 300
 301         if (ops->cursor_state.image.height != vc->vc_font.height ||
 302             ops->cursor_state.image.width != vc->vc_font.width ||
 303             ops->cursor_reset) {
 304                 ops->cursor_state.image.height = vc->vc_font.height;
 305                 ops->cursor_state.image.width = vc->vc_font.width;
 306                 cursor.set |= FB_CUR_SETSIZE;
 307         }
 308
 309         if (ops->cursor_state.hot.x || ops->cursor_state.hot.y ||
 310             ops->cursor_reset) {
 311                 ops->cursor_state.hot.x = cursor.hot.y = 0;
 312                 cursor.set |= FB_CUR_SETHOT;
 313         }
 314
 315         if (cursor.set & FB_CUR_SETSIZE ||
 316             vc->vc_cursor_type != p->cursor_shape ||
 317             ops->cursor_state.mask == NULL ||
 318             ops->cursor_reset) {
 319                 char *mask = kmalloc(w*vc->vc_font.height, GFP_ATOMIC);
 320                 int cur_height, size, i = 0;
 321                 u8 msk = 0xff;
 322
 323                 if (!mask)
 324                         return;
 325
 326                 kfree(ops->cursor_state.mask);
 327                 ops->cursor_state.mask = mask;
 328
 329                 p->cursor_shape = vc->vc_cursor_type;
 330                 cursor.set |= FB_CUR_SETSHAPE;
 331
 332                 switch (p->cursor_shape & CUR_HWMASK) {
 333                 case CUR_NONE:
 334                         cur_height = 0;
 335                         break;
 336                 case CUR_UNDERLINE:
 337                         cur_height = (vc->vc_font.height < 10) ? 1 : 2;
 338                         break;
 339                 case CUR_LOWER_THIRD:
 340                         cur_height = vc->vc_font.height/3;
 341                         break;
 342                 case CUR_LOWER_HALF:
 343                         cur_height = vc->vc_font.height >> 1;
 344                         break;
 345                 case CUR_TWO_THIRDS:
 346                         cur_height = (vc->vc_font.height << 1)/3;
 347                         break;
 348                 case CUR_BLOCK:
 349                 default:
 350                         cur_height = vc->vc_font.height;
 351                         break;
 352                 }
 353                 size = (vc->vc_font.height - cur_height) * w;
 354                 while (size--)
 355                         mask[i++] = ~msk;
 356                 size = cur_height * w;
 357                 while (size--)
 358                         mask[i++] = msk;
 359         }
 360
 361         switch (mode) {
 362         case CM_ERASE:
 363                 ops->cursor_state.enable = 0;
 364                 break;
 365         case CM_DRAW:
 366         case CM_MOVE:
 367         default:
 368                 ops->cursor_state.enable = (use_sw) ? 0 : 1;
 369                 break;
 370         }
 371
 372         cursor.image.data = src;
 373         cursor.image.fg_color = ops->cursor_state.image.fg_color;
 374         cursor.image.bg_color = ops->cursor_state.image.bg_color;
 375         cursor.image.dx = ops->cursor_state.image.dx;
 376         cursor.image.dy = ops->cursor_state.image.dy;
 377         cursor.image.height = ops->cursor_state.image.height;
 378         cursor.image.width = ops->cursor_state.image.width;
 379         cursor.hot.x = ops->cursor_state.hot.x;
 380         cursor.hot.y = ops->cursor_state.hot.y;
 381         cursor.mask = ops->cursor_state.mask;
 382         cursor.enable = ops->cursor_state.enable;
 383         cursor.image.depth = 1;
 384         cursor.rop = ROP_XOR;
 385
 386         info->fbops->fb_cursor(info, &cursor);
 387
 388         ops->cursor_reset = 0;
 389 }
 390
 391 void fbcon_set_bitops(struct fbcon_ops *ops)
 392 {
 393         ops->bmove = bit_bmove;
 394         ops->clear = bit_clear;
 395         ops->putcs = bit_putcs;
 396         ops->clear_margins = bit_clear_margins;
 397         ops->cursor = bit_cursor;
 398 }
 399
 400 EXPORT_SYMBOL(fbcon_set_bitops);
 401
 402 MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>");
 403 MODULE_DESCRIPTION("Bit Blitting Operation");
 404 MODULE_LICENSE("GPL");
 405