linux/drivers/video/console/bitblit.c
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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/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 */
  25static 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
  46static 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
  61static 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
  77static 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
 108static 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
 143static 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
 205static void bit_clear_margins(struct vc_data *vc, struct fb_info *info,
 206                              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 = 0;
 217        region.rop = ROP_COPY;
 218
 219        if (rw && !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 (bh) {
 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
 236static void bit_cursor(struct vc_data *vc, struct fb_info *info, int mode,
 237                       int softback_lines, 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->vc_y);
 244        int attribute, use_sw = (vc->vc_cursor_type & 0x10);
 245        int err = 1;
 246        char *src;
 247
 248        cursor.set = 0;
 249
 250        if (softback_lines) {
 251                if (y + softback_lines >= vc->vc_rows) {
 252                        mode = CM_ERASE;
 253                        ops->cursor_flash = 0;
 254                        return;
 255                } else
 256                        y += softback_lines;
 257        }
 258
 259        c = scr_readw((u16 *) vc->vc_pos);
 260        attribute = get_attribute(info, c);
 261        src = vc->vc_font.data + ((c & charmask) * (w * vc->vc_font.height));
 262
 263        if (ops->cursor_state.image.data != src ||
 264            ops->cursor_reset) {
 265            ops->cursor_state.image.data = src;
 266            cursor.set |= FB_CUR_SETIMAGE;
 267        }
 268
 269        if (attribute) {
 270                u8 *dst;
 271
 272                dst = kmalloc(w * vc->vc_font.height, GFP_ATOMIC);
 273                if (!dst)
 274                        return;
 275                kfree(ops->cursor_data);
 276                ops->cursor_data = dst;
 277                update_attr(dst, src, attribute, vc);
 278                src = dst;
 279        }
 280
 281        if (ops->cursor_state.image.fg_color != fg ||
 282            ops->cursor_state.image.bg_color != bg ||
 283            ops->cursor_reset) {
 284                ops->cursor_state.image.fg_color = fg;
 285                ops->cursor_state.image.bg_color = bg;
 286                cursor.set |= FB_CUR_SETCMAP;
 287        }
 288
 289        if ((ops->cursor_state.image.dx != (vc->vc_font.width * vc->vc_x)) ||
 290            (ops->cursor_state.image.dy != (vc->vc_font.height * y)) ||
 291            ops->cursor_reset) {
 292                ops->cursor_state.image.dx = vc->vc_font.width * vc->vc_x;
 293                ops->cursor_state.image.dy = vc->vc_font.height * y;
 294                cursor.set |= FB_CUR_SETPOS;
 295        }
 296
 297        if (ops->cursor_state.image.height != vc->vc_font.height ||
 298            ops->cursor_state.image.width != vc->vc_font.width ||
 299            ops->cursor_reset) {
 300                ops->cursor_state.image.height = vc->vc_font.height;
 301                ops->cursor_state.image.width = vc->vc_font.width;
 302                cursor.set |= FB_CUR_SETSIZE;
 303        }
 304
 305        if (ops->cursor_state.hot.x || ops->cursor_state.hot.y ||
 306            ops->cursor_reset) {
 307                ops->cursor_state.hot.x = cursor.hot.y = 0;
 308                cursor.set |= FB_CUR_SETHOT;
 309        }
 310
 311        if (cursor.set & FB_CUR_SETSIZE ||
 312            vc->vc_cursor_type != ops->p->cursor_shape ||
 313            ops->cursor_state.mask == NULL ||
 314            ops->cursor_reset) {
 315                char *mask = kmalloc(w*vc->vc_font.height, GFP_ATOMIC);
 316                int cur_height, size, i = 0;
 317                u8 msk = 0xff;
 318
 319                if (!mask)
 320                        return;
 321
 322                kfree(ops->cursor_state.mask);
 323                ops->cursor_state.mask = mask;
 324
 325                ops->p->cursor_shape = vc->vc_cursor_type;
 326                cursor.set |= FB_CUR_SETSHAPE;
 327
 328                switch (ops->p->cursor_shape & CUR_HWMASK) {
 329                case CUR_NONE:
 330                        cur_height = 0;
 331                        break;
 332                case CUR_UNDERLINE:
 333                        cur_height = (vc->vc_font.height < 10) ? 1 : 2;
 334                        break;
 335                case CUR_LOWER_THIRD:
 336                        cur_height = vc->vc_font.height/3;
 337                        break;
 338                case CUR_LOWER_HALF:
 339                        cur_height = vc->vc_font.height >> 1;
 340                        break;
 341                case CUR_TWO_THIRDS:
 342                        cur_height = (vc->vc_font.height << 1)/3;
 343                        break;
 344                case CUR_BLOCK:
 345                default:
 346                        cur_height = vc->vc_font.height;
 347                        break;
 348                }
 349                size = (vc->vc_font.height - cur_height) * w;
 350                while (size--)
 351                        mask[i++] = ~msk;
 352                size = cur_height * w;
 353                while (size--)
 354                        mask[i++] = msk;
 355        }
 356
 357        switch (mode) {
 358        case CM_ERASE:
 359                ops->cursor_state.enable = 0;
 360                break;
 361        case CM_DRAW:
 362        case CM_MOVE:
 363        default:
 364                ops->cursor_state.enable = (use_sw) ? 0 : 1;
 365                break;
 366        }
 367
 368        cursor.image.data = src;
 369        cursor.image.fg_color = ops->cursor_state.image.fg_color;
 370        cursor.image.bg_color = ops->cursor_state.image.bg_color;
 371        cursor.image.dx = ops->cursor_state.image.dx;
 372        cursor.image.dy = ops->cursor_state.image.dy;
 373        cursor.image.height = ops->cursor_state.image.height;
 374        cursor.image.width = ops->cursor_state.image.width;
 375        cursor.hot.x = ops->cursor_state.hot.x;
 376        cursor.hot.y = ops->cursor_state.hot.y;
 377        cursor.mask = ops->cursor_state.mask;
 378        cursor.enable = ops->cursor_state.enable;
 379        cursor.image.depth = 1;
 380        cursor.rop = ROP_XOR;
 381
 382        if (info->fbops->fb_cursor)
 383                err = info->fbops->fb_cursor(info, &cursor);
 384
 385        if (err)
 386                soft_cursor(info, &cursor);
 387
 388        ops->cursor_reset = 0;
 389}
 390
 391static int bit_update_start(struct fb_info *info)
 392{
 393        struct fbcon_ops *ops = info->fbcon_par;
 394        int err;
 395
 396        err = fb_pan_display(info, &ops->var);
 397        ops->var.xoffset = info->var.xoffset;
 398        ops->var.yoffset = info->var.yoffset;
 399        ops->var.vmode = info->var.vmode;
 400        return err;
 401}
 402
 403void fbcon_set_bitops(struct fbcon_ops *ops)
 404{
 405        ops->bmove = bit_bmove;
 406        ops->clear = bit_clear;
 407        ops->putcs = bit_putcs;
 408        ops->clear_margins = bit_clear_margins;
 409        ops->cursor = bit_cursor;
 410        ops->update_start = bit_update_start;
 411        ops->rotate_font = NULL;
 412
 413        if (ops->rotate)
 414                fbcon_set_rotate(ops);
 415}
 416
 417EXPORT_SYMBOL(fbcon_set_bitops);
 418
 419MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>");
 420MODULE_DESCRIPTION("Bit Blitting Operation");
 421MODULE_LICENSE("GPL");
 422
 423