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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 inline void bit_putcs_aligned(struct vc_data *vc, struct fb_info *info,
 107                                      const u16 *s, u32 attr, u32 cnt,
 108                                      u32 d_pitch, u32 s_pitch, u32 cellsize,
 109                                      struct fb_image *image, u8 *buf, u8 *dst)
 110 {
 111         u16 charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
 112         u32 idx = vc->vc_font.width >> 3;
 113         u8 *src;
 114
 115         while (cnt--) {
 116                 src = vc->vc_font.data + (scr_readw(s++)&
 117                                           charmask)*cellsize;
 118
 119                 if (attr) {
 120                         update_attr(buf, src, attr, vc);
 121                         src = buf;
 122                 }
 123
 124                 if (likely(idx == 1))
 125                         __fb_pad_aligned_buffer(dst, d_pitch, src, idx,
 126                                                 image->height);
 127                 else
 128                         fb_pad_aligned_buffer(dst, d_pitch, src, idx,
 129                                               image->height);
 130
 131                 dst += s_pitch;
 132         }
 133
 134         info->fbops->fb_imageblit(info, image);
 135 }
 136
 137 static inline void bit_putcs_unaligned(struct vc_data *vc,
 138                                        struct fb_info *info, const u16 *s,
 139                                        u32 attr, u32 cnt, u32 d_pitch,
 140                                        u32 s_pitch, u32 cellsize,
 141                                        struct fb_image *image, u8 *buf,
 142                                        u8 *dst)
 143 {
 144         u16 charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
 145         u32 shift_low = 0, mod = vc->vc_font.width % 8;
 146         u32 shift_high = 8;
 147         u32 idx = vc->vc_font.width >> 3;
 148         u8 *src;
 149
 150         while (cnt--) {
 151                 src = vc->vc_font.data + (scr_readw(s++)&
 152                                           charmask)*cellsize;
 153
 154                 if (attr) {
 155                         update_attr(buf, src, attr, vc);
 156                         src = buf;
 157                 }
 158
 159                 fb_pad_unaligned_buffer(dst, d_pitch, src, idx,
 160                                         image->height, shift_high,
 161                                         shift_low, mod);
 162                 shift_low += mod;
 163                 dst += (shift_low >= 8) ? s_pitch : s_pitch - 1;
 164                 shift_low &= 7;
 165                 shift_high = 8 - shift_low;
 166         }
 167
 168         info->fbops->fb_imageblit(info, image);
 169
 170 }
 171
 172 static void bit_putcs(struct vc_data *vc, struct fb_info *info,
 173                       const unsigned short *s, int count, int yy, int xx,
 174                       int fg, int bg)
 175 {
 176         struct fb_image image;
 177         u32 width = (vc->vc_font.width + 7)/8;
 178         u32 cellsize = width * vc->vc_font.height;
 179         u32 maxcnt = info->pixmap.size/cellsize;
 180         u32 scan_align = info->pixmap.scan_align - 1;
 181         u32 buf_align = info->pixmap.buf_align - 1;
 182         u32 mod = vc->vc_font.width % 8, cnt, pitch, size;
 183         u32 attribute = get_attribute(info, scr_readw(s));
 184         u8 *dst, *buf = NULL;
 185
 186         image.fg_color = fg;
 187         image.bg_color = bg;
 188         image.dx = xx * vc->vc_font.width;
 189         image.dy = yy * vc->vc_font.height;
 190         image.height = vc->vc_font.height;
 191         image.depth = 1;
 192
 193         if (attribute) {
 194                 buf = kmalloc(cellsize, GFP_KERNEL);
 195                 if (!buf)
 196                         return;
 197         }
 198
 199         while (count) {
 200                 if (count > maxcnt)
 201                         cnt = maxcnt;
 202                 else
 203                         cnt = count;
 204
 205                 image.width = vc->vc_font.width * cnt;
 206                 pitch = ((image.width + 7) >> 3) + scan_align;
 207                 pitch &= ~scan_align;
 208                 size = pitch * image.height + buf_align;
 209                 size &= ~buf_align;
 210                 dst = fb_get_buffer_offset(info, &info->pixmap, size);
 211                 image.data = dst;
 212
 213                 if (!mod)
 214                         bit_putcs_aligned(vc, info, s, attribute, cnt, pitch,
 215                                           width, cellsize, &image, buf, dst);
 216                 else
 217                         bit_putcs_unaligned(vc, info, s, attribute, cnt,
 218                                             pitch, width, cellsize, &image,
 219                                             buf, dst);
 220
 221                 image.dx += cnt * vc->vc_font.width;
 222                 count -= cnt;
 223                 s += cnt;
 224         }
 225
 226         /* buf is always NULL except when in monochrome mode, so in this case
 227            it's a gain to check buf against NULL even though kfree() handles
 228            NULL pointers just fine */
 229         if (unlikely(buf))
 230                 kfree(buf);
 231
 232 }
 233
 234 static void bit_clear_margins(struct vc_data *vc, struct fb_info *info,
 235                               int bottom_only)
 236 {
 237         int bgshift = (vc->vc_hi_font_mask) ? 13 : 12;
 238         unsigned int cw = vc->vc_font.width;
 239         unsigned int ch = vc->vc_font.height;
 240         unsigned int rw = info->var.xres - (vc->vc_cols*cw);
 241         unsigned int bh = info->var.yres - (vc->vc_rows*ch);
 242         unsigned int rs = info->var.xres - rw;
 243         unsigned int bs = info->var.yres - bh;
 244         struct fb_fillrect region;
 245
 246         region.color = attr_bgcol_ec(bgshift, vc);
 247         region.rop = ROP_COPY;
 248
 249         if (rw && !bottom_only) {
 250                 region.dx = info->var.xoffset + rs;
 251                 region.dy = 0;
 252                 region.width = rw;
 253                 region.height = info->var.yres_virtual;
 254                 info->fbops->fb_fillrect(info, &region);
 255         }
 256
 257         if (bh) {
 258                 region.dx = info->var.xoffset;
 259                 region.dy = info->var.yoffset + bs;
 260                 region.width = rs;
 261                 region.height = bh;
 262                 info->fbops->fb_fillrect(info, &region);
 263         }
 264 }
 265
 266 static void bit_cursor(struct vc_data *vc, struct fb_info *info,
 267                        struct display *p, int mode, int softback_lines, int fg, int bg)
 268 {
 269         struct fb_cursor cursor;
 270         struct fbcon_ops *ops = (struct fbcon_ops *) info->fbcon_par;
 271         unsigned short charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
 272         int w = (vc->vc_font.width + 7) >> 3, c;
 273         int y = real_y(p, vc->vc_y);
 274         int attribute, use_sw = (vc->vc_cursor_type & 0x10);
 275         char *src;
 276
 277         cursor.set = 0;
 278
 279         if (softback_lines) {
 280                 if (y + softback_lines >= vc->vc_rows) {
 281                         mode = CM_ERASE;
 282                         ops->cursor_flash = 0;
 283                         return;
 284                 } else
 285                         y += softback_lines;
 286         }
 287
 288         c = scr_readw((u16 *) vc->vc_pos);
 289         attribute = get_attribute(info, c);
 290         src = vc->vc_font.data + ((c & charmask) * (w * vc->vc_font.height));
 291
 292         if (ops->cursor_state.image.data != src ||
 293             ops->cursor_reset) {
 294             ops->cursor_state.image.data = src;
 295             cursor.set |= FB_CUR_SETIMAGE;
 296         }
 297
 298         if (attribute) {
 299                 u8 *dst;
 300
 301                 dst = kmalloc(w * vc->vc_font.height, GFP_ATOMIC);
 302                 if (!dst)
 303                         return;
 304                 kfree(ops->cursor_data);
 305                 ops->cursor_data = dst;
 306                 update_attr(dst, src, attribute, vc);
 307                 src = dst;
 308         }
 309
 310         if (ops->cursor_state.image.fg_color != fg ||
 311             ops->cursor_state.image.bg_color != bg ||
 312             ops->cursor_reset) {
 313                 ops->cursor_state.image.fg_color = fg;
 314                 ops->cursor_state.image.bg_color = bg;
 315                 cursor.set |= FB_CUR_SETCMAP;
 316         }
 317
 318         if ((ops->cursor_state.image.dx != (vc->vc_font.width * vc->vc_x)) ||
 319             (ops->cursor_state.image.dy != (vc->vc_font.height * y)) ||
 320             ops->cursor_reset) {
 321                 ops->cursor_state.image.dx = vc->vc_font.width * vc->vc_x;
 322                 ops->cursor_state.image.dy = vc->vc_font.height * y;
 323                 cursor.set |= FB_CUR_SETPOS;
 324         }
 325
 326         if (ops->cursor_state.image.height != vc->vc_font.height ||
 327             ops->cursor_state.image.width != vc->vc_font.width ||
 328             ops->cursor_reset) {
 329                 ops->cursor_state.image.height = vc->vc_font.height;
 330                 ops->cursor_state.image.width = vc->vc_font.width;
 331                 cursor.set |= FB_CUR_SETSIZE;
 332         }
 333
 334         if (ops->cursor_state.hot.x || ops->cursor_state.hot.y ||
 335             ops->cursor_reset) {
 336                 ops->cursor_state.hot.x = cursor.hot.y = 0;
 337                 cursor.set |= FB_CUR_SETHOT;
 338         }
 339
 340         if (cursor.set & FB_CUR_SETSIZE ||
 341             vc->vc_cursor_type != p->cursor_shape ||
 342             ops->cursor_state.mask == NULL ||
 343             ops->cursor_reset) {
 344                 char *mask = kmalloc(w*vc->vc_font.height, GFP_ATOMIC);
 345                 int cur_height, size, i = 0;
 346                 u8 msk = 0xff;
 347
 348                 if (!mask)
 349                         return;
 350
 351                 kfree(ops->cursor_state.mask);
 352                 ops->cursor_state.mask = mask;
 353
 354                 p->cursor_shape = vc->vc_cursor_type;
 355                 cursor.set |= FB_CUR_SETSHAPE;
 356
 357                 switch (p->cursor_shape & CUR_HWMASK) {
 358                 case CUR_NONE:
 359                         cur_height = 0;
 360                         break;
 361                 case CUR_UNDERLINE:
 362                         cur_height = (vc->vc_font.height < 10) ? 1 : 2;
 363                         break;
 364                 case CUR_LOWER_THIRD:
 365                         cur_height = vc->vc_font.height/3;
 366                         break;
 367                 case CUR_LOWER_HALF:
 368                         cur_height = vc->vc_font.height >> 1;
 369                         break;
 370                 case CUR_TWO_THIRDS:
 371                         cur_height = (vc->vc_font.height << 1)/3;
 372                         break;
 373                 case CUR_BLOCK:
 374                 default:
 375                         cur_height = vc->vc_font.height;
 376                         break;
 377                 }
 378                 size = (vc->vc_font.height - cur_height) * w;
 379                 while (size--)
 380                         mask[i++] = ~msk;
 381                 size = cur_height * w;
 382                 while (size--)
 383                         mask[i++] = msk;
 384         }
 385
 386         switch (mode) {
 387         case CM_ERASE:
 388                 ops->cursor_state.enable = 0;
 389                 break;
 390         case CM_DRAW:
 391         case CM_MOVE:
 392         default:
 393                 ops->cursor_state.enable = (use_sw) ? 0 : 1;
 394                 break;
 395         }
 396
 397         cursor.image.data = src;
 398         cursor.image.fg_color = ops->cursor_state.image.fg_color;
 399         cursor.image.bg_color = ops->cursor_state.image.bg_color;
 400         cursor.image.dx = ops->cursor_state.image.dx;
 401         cursor.image.dy = ops->cursor_state.image.dy;
 402         cursor.image.height = ops->cursor_state.image.height;
 403         cursor.image.width = ops->cursor_state.image.width;
 404         cursor.hot.x = ops->cursor_state.hot.x;
 405         cursor.hot.y = ops->cursor_state.hot.y;
 406         cursor.mask = ops->cursor_state.mask;
 407         cursor.enable = ops->cursor_state.enable;
 408         cursor.image.depth = 1;
 409         cursor.rop = ROP_XOR;
 410
 411         info->fbops->fb_cursor(info, &cursor);
 412
 413         ops->cursor_reset = 0;
 414 }
 415
 416 void fbcon_set_bitops(struct fbcon_ops *ops)
 417 {
 418         ops->bmove = bit_bmove;
 419         ops->clear = bit_clear;
 420         ops->putcs = bit_putcs;
 421         ops->clear_margins = bit_clear_margins;
 422         ops->cursor = bit_cursor;
 423 }
 424
 425 EXPORT_SYMBOL(fbcon_set_bitops);
 426
 427 MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>");
 428 MODULE_DESCRIPTION("Bit Blitting Operation");
 429 MODULE_LICENSE("GPL");
 430