drivers/video/fbdev/core/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/module.h>
  14 #include <linux/slab.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 static void update_attr(u8 *dst, u8 *src, int attribute,
  26                                struct vc_data *vc)
  27 {
  28         int i, offset = (vc->vc_font.height < 10) ? 1 : 2;
  29         int width = DIV_ROUND_UP(vc->vc_font.width, 8);
  30         unsigned int cellsize = vc->vc_font.height * width;
  31         u8 c;
  32
  33         offset = cellsize - (offset * width);
  34         for (i = 0; i < cellsize; i++) {
  35                 c = src[i];
  36                 if (attribute & FBCON_ATTRIBUTE_UNDERLINE && i >= offset)
  37                         c = 0xff;
  38                 if (attribute & FBCON_ATTRIBUTE_BOLD)
  39                         c |= c >> 1;
  40                 if (attribute & FBCON_ATTRIBUTE_REVERSE)
  41                         c = ~c;
  42                 dst[i] = c;
  43         }
  44 }
  45
  46 static void bit_bmove(struct vc_data *vc, struct fb_info *info, int sy,
  47                       int sx, int dy, int dx, int height, int width)
  48 {
  49         struct fb_copyarea area;
  50
  51         area.sx = sx * vc->vc_font.width;
  52         area.sy = sy * vc->vc_font.height;
  53         area.dx = dx * vc->vc_font.width;
  54         area.dy = dy * vc->vc_font.height;
  55         area.height = height * vc->vc_font.height;
  56         area.width = width * vc->vc_font.width;
  57
  58         info->fbops->fb_copyarea(info, &area);
  59 }
  60
  61 static void bit_clear(struct vc_data *vc, struct fb_info *info, int sy,
  62                       int sx, int height, int width)
  63 {
  64         int bgshift = (vc->vc_hi_font_mask) ? 13 : 12;
  65         struct fb_fillrect region;
  66
  67         region.color = attr_bgcol_ec(bgshift, vc, info);
  68         region.dx = sx * vc->vc_font.width;
  69         region.dy = sy * vc->vc_font.height;
  70         region.width = width * vc->vc_font.width;
  71         region.height = height * vc->vc_font.height;
  72         region.rop = ROP_COPY;
  73
  74         info->fbops->fb_fillrect(info, &region);
  75 }
  76
  77 static inline void bit_putcs_aligned(struct vc_data *vc, struct fb_info *info,
  78                                      const u16 *s, u32 attr, u32 cnt,
  79                                      u32 d_pitch, u32 s_pitch, u32 cellsize,
  80                                      struct fb_image *image, u8 *buf, u8 *dst)
  81 {
  82         u16 charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
  83         u32 idx = vc->vc_font.width >> 3;
  84         u8 *src;
  85
  86         while (cnt--) {
  87                 src = vc->vc_font.data + (scr_readw(s++)&
  88                                           charmask)*cellsize;
  89
  90                 if (attr) {
  91                         update_attr(buf, src, attr, vc);
  92                         src = buf;
  93                 }
  94
  95                 if (likely(idx == 1))
  96                         __fb_pad_aligned_buffer(dst, d_pitch, src, idx,
  97                                                 image->height);
  98                 else
  99                         fb_pad_aligned_buffer(dst, d_pitch, src, idx,
 100                                               image->height);
 101
 102                 dst += s_pitch;
 103         }
 104
 105         info->fbops->fb_imageblit(info, image);
 106 }
 107
 108 static inline void bit_putcs_unaligned(struct vc_data *vc,
 109                                        struct fb_info *info, const u16 *s,
 110                                        u32 attr, u32 cnt, u32 d_pitch,
 111                                        u32 s_pitch, u32 cellsize,
 112                                        struct fb_image *image, u8 *buf,
 113                                        u8 *dst)
 114 {
 115         u16 charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
 116         u32 shift_low = 0, mod = vc->vc_font.width % 8;
 117         u32 shift_high = 8;
 118         u32 idx = vc->vc_font.width >> 3;
 119         u8 *src;
 120
 121         while (cnt--) {
 122                 src = vc->vc_font.data + (scr_readw(s++)&
 123                                           charmask)*cellsize;
 124
 125                 if (attr) {
 126                         update_attr(buf, src, attr, vc);
 127                         src = buf;
 128                 }
 129
 130                 fb_pad_unaligned_buffer(dst, d_pitch, src, idx,
 131                                         image->height, shift_high,
 132                                         shift_low, mod);
 133                 shift_low += mod;
 134                 dst += (shift_low >= 8) ? s_pitch : s_pitch - 1;
 135                 shift_low &= 7;
 136                 shift_high = 8 - shift_low;
 137         }
 138
 139         info->fbops->fb_imageblit(info, image);
 140
 141 }
 142
 143 static void bit_putcs(struct vc_data *vc, struct fb_info *info,
 144                       const unsigned short *s, int count, int yy, int xx,
 145                       int fg, int bg)
 146 {
 147         struct fb_image image;
 148         u32 width = DIV_ROUND_UP(vc->vc_font.width, 8);
 149         u32 cellsize = width * vc->vc_font.height;
 150         u32 maxcnt = info->pixmap.size/cellsize;
 151         u32 scan_align = info->pixmap.scan_align - 1;
 152         u32 buf_align = info->pixmap.buf_align - 1;
 153         u32 mod = vc->vc_font.width % 8, cnt, pitch, size;
 154         u32 attribute = get_attribute(info, scr_readw(s));
 155         u8 *dst, *buf = NULL;
 156
 157         image.fg_color = fg;
 158         image.bg_color = bg;
 159         image.dx = xx * vc->vc_font.width;
 160         image.dy = yy * vc->vc_font.height;
 161         image.height = vc->vc_font.height;
 162         image.depth = 1;
 163
 164         if (attribute) {
 165                 buf = kmalloc(cellsize, GFP_ATOMIC);
 166                 if (!buf)
 167                         return;
 168         }
 169
 170         while (count) {
 171                 if (count > maxcnt)
 172                         cnt = maxcnt;
 173                 else
 174                         cnt = count;
 175
 176                 image.width = vc->vc_font.width * cnt;
 177                 pitch = DIV_ROUND_UP(image.width, 8) + scan_align;
 178                 pitch &= ~scan_align;
 179                 size = pitch * image.height + buf_align;
 180                 size &= ~buf_align;
 181                 dst = fb_get_buffer_offset(info, &info->pixmap, size);
 182                 image.data = dst;
 183
 184                 if (!mod)
 185                         bit_putcs_aligned(vc, info, s, attribute, cnt, pitch,
 186                                           width, cellsize, &image, buf, dst);
 187                 else
 188                         bit_putcs_unaligned(vc, info, s, attribute, cnt,
 189                                             pitch, width, cellsize, &image,
 190                                             buf, dst);
 191
 192                 image.dx += cnt * vc->vc_font.width;
 193                 count -= cnt;
 194                 s += cnt;
 195         }
 196
 197         /* buf is always NULL except when in monochrome mode, so in this case
 198            it's a gain to check buf against NULL even though kfree() handles
 199            NULL pointers just fine */
 200         if (unlikely(buf))
 201                 kfree(buf);
 202
 203 }
 204
 205 static void bit_clear_margins(struct vc_data *vc, struct fb_info *info,
 206                               int color, int bottom_only)
 207 {
 208         unsigned int cw = vc->vc_font.width;
 209         unsigned int ch = vc->vc_font.height;
 210         unsigned int rw = info->var.xres - (vc->vc_cols*cw);
 211         unsigned int bh = info->var.yres - (vc->vc_rows*ch);
 212         unsigned int rs = info->var.xres - rw;
 213         unsigned int bs = info->var.yres - bh;
 214         struct fb_fillrect region;
 215
 216         region.color = color;
 217         region.rop = ROP_COPY;
 218
 219         if ((int) rw > 0 && !bottom_only) {
 220                 region.dx = info->var.xoffset + rs;
 221                 region.dy = 0;
 222                 region.width = rw;
 223                 region.height = info->var.yres_virtual;
 224                 info->fbops->fb_fillrect(info, &region);
 225         }
 226
 227         if ((int) bh > 0) {
 228                 region.dx = info->var.xoffset;
 229                 region.dy = info->var.yoffset + bs;
 230                 region.width = rs;
 231                 region.height = bh;
 232                 info->fbops->fb_fillrect(info, &region);
 233         }
 234 }
 235
 236 static void bit_cursor(struct vc_data *vc, struct fb_info *info, bool enable,
 237                        int fg, int bg)
 238 {
 239         struct fb_cursor cursor;
 240         struct fbcon_ops *ops = info->fbcon_par;
 241         unsigned short charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
 242         int w = DIV_ROUND_UP(vc->vc_font.width, 8), c;
 243         int y = real_y(ops->p, vc->state.y);
 244         int attribute, use_sw = vc->vc_cursor_type & CUR_SW;
 245         int err = 1;
 246         char *src;
 247
 248         cursor.set = 0;
 249
 250         if (!vc->vc_font.data)
 251                 return;
 252
 253         c = scr_readw((u16 *) vc->vc_pos);
 254         attribute = get_attribute(info, c);
 255         src = vc->vc_font.data + ((c & charmask) * (w * vc->vc_font.height));
 256
 257         if (ops->cursor_state.image.data != src ||
 258             ops->cursor_reset) {
 259             ops->cursor_state.image.data = src;
 260             cursor.set |= FB_CUR_SETIMAGE;
 261         }
 262
 263         if (attribute) {
 264                 u8 *dst;
 265
 266                 dst = kmalloc_array(w, vc->vc_font.height, GFP_ATOMIC);
 267                 if (!dst)
 268                         return;
 269                 kfree(ops->cursor_data);
 270                 ops->cursor_data = dst;
 271                 update_attr(dst, src, attribute, vc);
 272                 src = dst;
 273         }
 274
 275         if (ops->cursor_state.image.fg_color != fg ||
 276             ops->cursor_state.image.bg_color != bg ||
 277             ops->cursor_reset) {
 278                 ops->cursor_state.image.fg_color = fg;
 279                 ops->cursor_state.image.bg_color = bg;
 280                 cursor.set |= FB_CUR_SETCMAP;
 281         }
 282
 283         if ((ops->cursor_state.image.dx != (vc->vc_font.width * vc->state.x)) ||
 284             (ops->cursor_state.image.dy != (vc->vc_font.height * y)) ||
 285             ops->cursor_reset) {
 286                 ops->cursor_state.image.dx = vc->vc_font.width * vc->state.x;
 287                 ops->cursor_state.image.dy = vc->vc_font.height * y;
 288                 cursor.set |= FB_CUR_SETPOS;
 289         }
 290
 291         if (ops->cursor_state.image.height != vc->vc_font.height ||
 292             ops->cursor_state.image.width != vc->vc_font.width ||
 293             ops->cursor_reset) {
 294                 ops->cursor_state.image.height = vc->vc_font.height;
 295                 ops->cursor_state.image.width = vc->vc_font.width;
 296                 cursor.set |= FB_CUR_SETSIZE;
 297         }
 298
 299         if (ops->cursor_state.hot.x || ops->cursor_state.hot.y ||
 300             ops->cursor_reset) {
 301                 ops->cursor_state.hot.x = cursor.hot.y = 0;
 302                 cursor.set |= FB_CUR_SETHOT;
 303         }
 304
 305         if (cursor.set & FB_CUR_SETSIZE ||
 306             vc->vc_cursor_type != ops->p->cursor_shape ||
 307             ops->cursor_state.mask == NULL ||
 308             ops->cursor_reset) {
 309                 char *mask = kmalloc_array(w, vc->vc_font.height, GFP_ATOMIC);
 310                 int cur_height, size, i = 0;
 311                 u8 msk = 0xff;
 312
 313                 if (!mask)
 314                         return;
 315
 316                 kfree(ops->cursor_state.mask);
 317                 ops->cursor_state.mask = mask;
 318
 319                 ops->p->cursor_shape = vc->vc_cursor_type;
 320                 cursor.set |= FB_CUR_SETSHAPE;
 321
 322                 switch (CUR_SIZE(ops->p->cursor_shape)) {
 323                 case CUR_NONE:
 324                         cur_height = 0;
 325                         break;
 326                 case CUR_UNDERLINE:
 327                         cur_height = (vc->vc_font.height < 10) ? 1 : 2;
 328                         break;
 329                 case CUR_LOWER_THIRD:
 330                         cur_height = vc->vc_font.height/3;
 331                         break;
 332                 case CUR_LOWER_HALF:
 333                         cur_height = vc->vc_font.height >> 1;
 334                         break;
 335                 case CUR_TWO_THIRDS:
 336                         cur_height = (vc->vc_font.height << 1)/3;
 337                         break;
 338                 case CUR_BLOCK:
 339                 default:
 340                         cur_height = vc->vc_font.height;
 341                         break;
 342                 }
 343                 size = (vc->vc_font.height - cur_height) * w;
 344                 while (size--)
 345                         mask[i++] = ~msk;
 346                 size = cur_height * w;
 347                 while (size--)
 348                         mask[i++] = msk;
 349         }
 350
 351         ops->cursor_state.enable = enable && !use_sw;
 352
 353         cursor.image.data = src;
 354         cursor.image.fg_color = ops->cursor_state.image.fg_color;
 355         cursor.image.bg_color = ops->cursor_state.image.bg_color;
 356         cursor.image.dx = ops->cursor_state.image.dx;
 357         cursor.image.dy = ops->cursor_state.image.dy;
 358         cursor.image.height = ops->cursor_state.image.height;
 359         cursor.image.width = ops->cursor_state.image.width;
 360         cursor.hot.x = ops->cursor_state.hot.x;
 361         cursor.hot.y = ops->cursor_state.hot.y;
 362         cursor.mask = ops->cursor_state.mask;
 363         cursor.enable = ops->cursor_state.enable;
 364         cursor.image.depth = 1;
 365         cursor.rop = ROP_XOR;
 366
 367         if (info->fbops->fb_cursor)
 368                 err = info->fbops->fb_cursor(info, &cursor);
 369
 370         if (err)
 371                 soft_cursor(info, &cursor);
 372
 373         ops->cursor_reset = 0;
 374 }
 375
 376 static int bit_update_start(struct fb_info *info)
 377 {
 378         struct fbcon_ops *ops = info->fbcon_par;
 379         int err;
 380
 381         err = fb_pan_display(info, &ops->var);
 382         ops->var.xoffset = info->var.xoffset;
 383         ops->var.yoffset = info->var.yoffset;
 384         ops->var.vmode = info->var.vmode;
 385         return err;
 386 }
 387
 388 void fbcon_set_bitops(struct fbcon_ops *ops)
 389 {
 390         ops->bmove = bit_bmove;
 391         ops->clear = bit_clear;
 392         ops->putcs = bit_putcs;
 393         ops->clear_margins = bit_clear_margins;
 394         ops->cursor = bit_cursor;
 395         ops->update_start = bit_update_start;
 396         ops->rotate_font = NULL;
 397
 398         if (ops->rotate)
 399                 fbcon_set_rotate(ops);
 400 }