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         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, 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                                 fb_pad_aligned_buffer(dst, pitch, src, idx, image.height);
 179                                 dst += width;
 180                         }
 181                 }
 182                 info->fbops->fb_imageblit(info, &image);
 183                 image.dx += cnt * vc->vc_font.width;
 184                 count -= cnt;
 185         }
 186
 187         /* buf is always NULL except when in monochrome mode, so in this case
 188            it's a gain to check buf against NULL even though kfree() handles
 189            NULL pointers just fine */
 190         if (unlikely(buf))
 191                 kfree(buf);
 192 }
 193
 194 static void bit_clear_margins(struct vc_data *vc, struct fb_info *info,
 195                               int bottom_only)
 196 {
 197         int bgshift = (vc->vc_hi_font_mask) ? 13 : 12;
 198         unsigned int cw = vc->vc_font.width;
 199         unsigned int ch = vc->vc_font.height;
 200         unsigned int rw = info->var.xres - (vc->vc_cols*cw);
 201         unsigned int bh = info->var.yres - (vc->vc_rows*ch);
 202         unsigned int rs = info->var.xres - rw;
 203         unsigned int bs = info->var.yres - bh;
 204         struct fb_fillrect region;
 205
 206         region.color = attr_bgcol_ec(bgshift, vc);
 207         region.rop = ROP_COPY;
 208
 209         if (rw && !bottom_only) {
 210                 region.dx = info->var.xoffset + rs;
 211                 region.dy = 0;
 212                 region.width = rw;
 213                 region.height = info->var.yres_virtual;
 214                 info->fbops->fb_fillrect(info, &region);
 215         }
 216
 217         if (bh) {
 218                 region.dx = info->var.xoffset;
 219                 region.dy = info->var.yoffset + bs;
 220                 region.width = rs;
 221                 region.height = bh;
 222                 info->fbops->fb_fillrect(info, &region);
 223         }
 224 }
 225
 226 static void bit_cursor(struct vc_data *vc, struct fb_info *info,
 227                        struct display *p, int mode, int softback_lines, int fg, int bg)
 228 {
 229         struct fb_cursor cursor;
 230         struct fbcon_ops *ops = (struct fbcon_ops *) info->fbcon_par;
 231         unsigned short charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
 232         int w = (vc->vc_font.width + 7) >> 3, c;
 233         int y = real_y(p, vc->vc_y);
 234         int attribute, use_sw = (vc->vc_cursor_type & 0x10);
 235         char *src;
 236
 237         cursor.set = 0;
 238
 239         if (softback_lines) {
 240                 if (y + softback_lines >= vc->vc_rows) {
 241                         mode = CM_ERASE;
 242                         ops->cursor_flash = 0;
 243                         return;
 244                 } else
 245                         y += softback_lines;
 246         }
 247
 248         c = scr_readw((u16 *) vc->vc_pos);
 249         attribute = get_attribute(info, c);
 250         src = vc->vc_font.data + ((c & charmask) * (w * vc->vc_font.height));
 251
 252         if (ops->cursor_state.image.data != src ||
 253             ops->cursor_reset) {
 254             ops->cursor_state.image.data = src;
 255             cursor.set |= FB_CUR_SETIMAGE;
 256         }
 257
 258         if (attribute) {
 259                 u8 *dst;
 260
 261                 dst = kmalloc(w * vc->vc_font.height, GFP_ATOMIC);
 262                 if (!dst)
 263                         return;
 264                 kfree(ops->cursor_data);
 265                 ops->cursor_data = dst;
 266                 update_attr(dst, src, attribute, vc);
 267                 src = dst;
 268         }
 269
 270         if (ops->cursor_state.image.fg_color != fg ||
 271             ops->cursor_state.image.bg_color != bg ||
 272             ops->cursor_reset) {
 273                 ops->cursor_state.image.fg_color = fg;
 274                 ops->cursor_state.image.bg_color = bg;
 275                 cursor.set |= FB_CUR_SETCMAP;
 276         }
 277
 278         if ((ops->cursor_state.image.dx != (vc->vc_font.width * vc->vc_x)) ||
 279             (ops->cursor_state.image.dy != (vc->vc_font.height * y)) ||
 280             ops->cursor_reset) {
 281                 ops->cursor_state.image.dx = vc->vc_font.width * vc->vc_x;
 282                 ops->cursor_state.image.dy = vc->vc_font.height * y;
 283                 cursor.set |= FB_CUR_SETPOS;
 284         }
 285
 286         if (ops->cursor_state.image.height != vc->vc_font.height ||
 287             ops->cursor_state.image.width != vc->vc_font.width ||
 288             ops->cursor_reset) {
 289                 ops->cursor_state.image.height = vc->vc_font.height;
 290                 ops->cursor_state.image.width = vc->vc_font.width;
 291                 cursor.set |= FB_CUR_SETSIZE;
 292         }
 293
 294         if (ops->cursor_state.hot.x || ops->cursor_state.hot.y ||
 295             ops->cursor_reset) {
 296                 ops->cursor_state.hot.x = cursor.hot.y = 0;
 297                 cursor.set |= FB_CUR_SETHOT;
 298         }
 299
 300         if (cursor.set & FB_CUR_SETSIZE ||
 301             vc->vc_cursor_type != p->cursor_shape ||
 302             ops->cursor_state.mask == NULL ||
 303             ops->cursor_reset) {
 304                 char *mask = kmalloc(w*vc->vc_font.height, GFP_ATOMIC);
 305                 int cur_height, size, i = 0;
 306                 u8 msk = 0xff;
 307
 308                 if (!mask)
 309                         return;
 310
 311                 kfree(ops->cursor_state.mask);
 312                 ops->cursor_state.mask = mask;
 313
 314                 p->cursor_shape = vc->vc_cursor_type;
 315                 cursor.set |= FB_CUR_SETSHAPE;
 316
 317                 switch (p->cursor_shape & CUR_HWMASK) {
 318                 case CUR_NONE:
 319                         cur_height = 0;
 320                         break;
 321                 case CUR_UNDERLINE:
 322                         cur_height = (vc->vc_font.height < 10) ? 1 : 2;
 323                         break;
 324                 case CUR_LOWER_THIRD:
 325                         cur_height = vc->vc_font.height/3;
 326                         break;
 327                 case CUR_LOWER_HALF:
 328                         cur_height = vc->vc_font.height >> 1;
 329                         break;
 330                 case CUR_TWO_THIRDS:
 331                         cur_height = (vc->vc_font.height << 1)/3;
 332                         break;
 333                 case CUR_BLOCK:
 334                 default:
 335                         cur_height = vc->vc_font.height;
 336                         break;
 337                 }
 338                 size = (vc->vc_font.height - cur_height) * w;
 339                 while (size--)
 340                         mask[i++] = ~msk;
 341                 size = cur_height * w;
 342                 while (size--)
 343                         mask[i++] = msk;
 344         }
 345
 346         switch (mode) {
 347         case CM_ERASE:
 348                 ops->cursor_state.enable = 0;
 349                 break;
 350         case CM_DRAW:
 351         case CM_MOVE:
 352         default:
 353                 ops->cursor_state.enable = (use_sw) ? 0 : 1;
 354                 break;
 355         }
 356
 357         cursor.image.data = src;
 358         cursor.image.fg_color = ops->cursor_state.image.fg_color;
 359         cursor.image.bg_color = ops->cursor_state.image.bg_color;
 360         cursor.image.dx = ops->cursor_state.image.dx;
 361         cursor.image.dy = ops->cursor_state.image.dy;
 362         cursor.image.height = ops->cursor_state.image.height;
 363         cursor.image.width = ops->cursor_state.image.width;
 364         cursor.hot.x = ops->cursor_state.hot.x;
 365         cursor.hot.y = ops->cursor_state.hot.y;
 366         cursor.mask = ops->cursor_state.mask;
 367         cursor.enable = ops->cursor_state.enable;
 368         cursor.image.depth = 1;
 369         cursor.rop = ROP_XOR;
 370
 371         info->fbops->fb_cursor(info, &cursor);
 372
 373         ops->cursor_reset = 0;
 374 }
 375
 376 void fbcon_set_bitops(struct fbcon_ops *ops)
 377 {
 378         ops->bmove = bit_bmove;
 379         ops->clear = bit_clear;
 380         ops->putcs = bit_putcs;
 381         ops->clear_margins = bit_clear_margins;
 382         ops->cursor = bit_cursor;
 383 }
 384
 385 EXPORT_SYMBOL(fbcon_set_bitops);
 386
 387 MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>");
 388 MODULE_DESCRIPTION("Bit Blitting Operation");
 389 MODULE_LICENSE("GPL");
 390