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bitblit.c
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linux-6.19.14/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 */ 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, int fg, int bg) 63{ 64 struct fb_fillrect region; 65 66 region.color = bg; 67 region.dx = sx * vc->vc_font.width; 68 region.dy = sy * vc->vc_font.height; 69 region.width = width * vc->vc_font.width; 70 region.height = height * vc->vc_font.height; 71 region.rop = ROP_COPY; 72 73 info->fbops->fb_fillrect(info, ®ion); 74} 75 76static inline void bit_putcs_aligned(struct vc_data *vc, struct fb_info *info, 77 const u16 *s, u32 attr, u32 cnt, 78 u32 d_pitch, u32 s_pitch, u32 cellsize, 79 struct fb_image *image, u8 *buf, u8 *dst) 80{ 81 u16 charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff; 82 unsigned int charcnt = vc->vc_font.charcount; 83 u32 idx = vc->vc_font.width >> 3; 84 u8 *src; 85 86 while (cnt--) { 87 u16 ch = scr_readw(s++) & charmask; 88 89 if (ch >= charcnt) 90 ch = 0; 91 src = vc->vc_font.data + (unsigned int)ch * cellsize; 92 93 if (attr) { 94 update_attr(buf, src, attr, vc); 95 src = buf; 96 } 97 98 if (likely(idx == 1)) 99 __fb_pad_aligned_buffer(dst, d_pitch, src, idx, 100 image->height); 101 else 102 fb_pad_aligned_buffer(dst, d_pitch, src, idx, 103 image->height); 104 105 dst += s_pitch; 106 } 107 108 info->fbops->fb_imageblit(info, image); 109} 110 111static inline void bit_putcs_unaligned(struct vc_data *vc, 112 struct fb_info *info, const u16 *s, 113 u32 attr, u32 cnt, u32 d_pitch, 114 u32 s_pitch, u32 cellsize, 115 struct fb_image *image, u8 *buf, 116 u8 *dst) 117{ 118 u16 charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff; 119 unsigned int charcnt = vc->vc_font.charcount; 120 u32 shift_low = 0, mod = vc->vc_font.width % 8; 121 u32 shift_high = 8; 122 u32 idx = vc->vc_font.width >> 3; 123 u8 *src; 124 125 while (cnt--) { 126 u16 ch = scr_readw(s++) & charmask; 127 128 if (ch >= charcnt) 129 ch = 0; 130 src = vc->vc_font.data + (unsigned int)ch * cellsize; 131 132 if (attr) { 133 update_attr(buf, src, attr, vc); 134 src = buf; 135 } 136 137 fb_pad_unaligned_buffer(dst, d_pitch, src, idx, 138 image->height, shift_high, 139 shift_low, mod); 140 shift_low += mod; 141 dst += (shift_low >= 8) ? s_pitch : s_pitch - 1; 142 shift_low &= 7; 143 shift_high = 8 - shift_low; 144 } 145 146 info->fbops->fb_imageblit(info, image); 147 148} 149 150static void bit_putcs(struct vc_data *vc, struct fb_info *info, 151 const unsigned short *s, int count, int yy, int xx, 152 int fg, int bg) 153{ 154 struct fb_image image; 155 u32 width = DIV_ROUND_UP(vc->vc_font.width, 8); 156 u32 cellsize = width * vc->vc_font.height; 157 u32 maxcnt = info->pixmap.size/cellsize; 158 u32 scan_align = info->pixmap.scan_align - 1; 159 u32 buf_align = info->pixmap.buf_align - 1; 160 u32 mod = vc->vc_font.width % 8, cnt, pitch, size; 161 u32 attribute = get_attribute(info, scr_readw(s)); 162 u8 *dst, *buf = NULL; 163 164 image.fg_color = fg; 165 image.bg_color = bg; 166 image.dx = xx * vc->vc_font.width; 167 image.dy = yy * vc->vc_font.height; 168 image.height = vc->vc_font.height; 169 image.depth = 1; 170 171 if (image.dy >= info->var.yres) 172 return; 173 174 image.height = min(image.height, info->var.yres - image.dy); 175 176 if (attribute) { 177 buf = kmalloc(cellsize, GFP_ATOMIC); 178 if (!buf) 179 return; 180 } 181 182 while (count) { 183 if (count > maxcnt) 184 cnt = maxcnt; 185 else 186 cnt = count; 187 188 image.width = vc->vc_font.width * cnt; 189 190 if (image.dx >= info->var.xres) 191 break; 192 193 if (image.dx + image.width > info->var.xres) { 194 image.width = info->var.xres - image.dx; 195 cnt = image.width / vc->vc_font.width; 196 if (cnt == 0) 197 break; 198 image.width = cnt * vc->vc_font.width; 199 } 200 201 pitch = DIV_ROUND_UP(image.width, 8) + scan_align; 202 pitch &= ~scan_align; 203 size = pitch * image.height + buf_align; 204 size &= ~buf_align; 205 dst = fb_get_buffer_offset(info, &info->pixmap, size); 206 image.data = dst; 207 208 if (!mod) 209 bit_putcs_aligned(vc, info, s, attribute, cnt, pitch, 210 width, cellsize, &image, buf, dst); 211 else 212 bit_putcs_unaligned(vc, info, s, attribute, cnt, 213 pitch, width, cellsize, &image, 214 buf, dst); 215 216 image.dx += cnt * vc->vc_font.width; 217 count -= cnt; 218 s += cnt; 219 } 220 221 /* buf is always NULL except when in monochrome mode, so in this case 222 it's a gain to check buf against NULL even though kfree() handles 223 NULL pointers just fine */ 224 if (unlikely(buf)) 225 kfree(buf); 226 227} 228 229static void bit_clear_margins(struct vc_data *vc, struct fb_info *info, 230 int color, int bottom_only) 231{ 232 unsigned int cw = vc->vc_font.width; 233 unsigned int ch = vc->vc_font.height; 234 unsigned int rw = info->var.xres - (vc->vc_cols*cw); 235 unsigned int bh = info->var.yres - (vc->vc_rows*ch); 236 unsigned int rs = info->var.xres - rw; 237 unsigned int bs = info->var.yres - bh; 238 struct fb_fillrect region; 239 240 region.color = color; 241 region.rop = ROP_COPY; 242 243 if ((int) rw > 0 && !bottom_only) { 244 region.dx = info->var.xoffset + rs; 245 region.dy = 0; 246 region.width = rw; 247 region.height = info->var.yres_virtual; 248 info->fbops->fb_fillrect(info, ®ion); 249 } 250 251 if ((int) bh > 0) { 252 region.dx = info->var.xoffset; 253 region.dy = info->var.yoffset + bs; 254 region.width = rs; 255 region.height = bh; 256 info->fbops->fb_fillrect(info, ®ion); 257 } 258} 259 260static void bit_cursor(struct vc_data *vc, struct fb_info *info, bool enable, 261 int fg, int bg) 262{ 263 struct fb_cursor cursor; 264 struct fbcon_par *par = info->fbcon_par; 265 unsigned short charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff; 266 int w = DIV_ROUND_UP(vc->vc_font.width, 8), c; 267 int y = real_y(par->p, vc->state.y); 268 int attribute, use_sw = vc->vc_cursor_type & CUR_SW; 269 int err = 1; 270 char *src; 271 272 cursor.set = 0; 273 274 if (!vc->vc_font.data) 275 return; 276 277 c = scr_readw((u16 *) vc->vc_pos); 278 attribute = get_attribute(info, c); 279 src = vc->vc_font.data + ((c & charmask) * (w * vc->vc_font.height)); 280 281 if (par->cursor_state.image.data != src || 282 par->cursor_reset) { 283 par->cursor_state.image.data = src; 284 cursor.set |= FB_CUR_SETIMAGE; 285 } 286 287 if (attribute) { 288 u8 *dst; 289 290 dst = kmalloc_array(w, vc->vc_font.height, GFP_ATOMIC); 291 if (!dst) 292 return; 293 kfree(par->cursor_data); 294 par->cursor_data = dst; 295 update_attr(dst, src, attribute, vc); 296 src = dst; 297 } 298 299 if (par->cursor_state.image.fg_color != fg || 300 par->cursor_state.image.bg_color != bg || 301 par->cursor_reset) { 302 par->cursor_state.image.fg_color = fg; 303 par->cursor_state.image.bg_color = bg; 304 cursor.set |= FB_CUR_SETCMAP; 305 } 306 307 if ((par->cursor_state.image.dx != (vc->vc_font.width * vc->state.x)) || 308 (par->cursor_state.image.dy != (vc->vc_font.height * y)) || 309 par->cursor_reset) { 310 par->cursor_state.image.dx = vc->vc_font.width * vc->state.x; 311 par->cursor_state.image.dy = vc->vc_font.height * y; 312 cursor.set |= FB_CUR_SETPOS; 313 } 314 315 if (par->cursor_state.image.height != vc->vc_font.height || 316 par->cursor_state.image.width != vc->vc_font.width || 317 par->cursor_reset) { 318 par->cursor_state.image.height = vc->vc_font.height; 319 par->cursor_state.image.width = vc->vc_font.width; 320 cursor.set |= FB_CUR_SETSIZE; 321 } 322 323 if (par->cursor_state.hot.x || par->cursor_state.hot.y || 324 par->cursor_reset) { 325 par->cursor_state.hot.x = cursor.hot.y = 0; 326 cursor.set |= FB_CUR_SETHOT; 327 } 328 329 if (cursor.set & FB_CUR_SETSIZE || 330 vc->vc_cursor_type != par->p->cursor_shape || 331 par->cursor_state.mask == NULL || 332 par->cursor_reset) { 333 char *mask = kmalloc_array(w, vc->vc_font.height, GFP_ATOMIC); 334 int cur_height, size, i = 0; 335 u8 msk = 0xff; 336 337 if (!mask) 338 return; 339 340 kfree(par->cursor_state.mask); 341 par->cursor_state.mask = mask; 342 343 par->p->cursor_shape = vc->vc_cursor_type; 344 cursor.set |= FB_CUR_SETSHAPE; 345 346 switch (CUR_SIZE(par->p->cursor_shape)) { 347 case CUR_NONE: 348 cur_height = 0; 349 break; 350 case CUR_UNDERLINE: 351 cur_height = (vc->vc_font.height < 10) ? 1 : 2; 352 break; 353 case CUR_LOWER_THIRD: 354 cur_height = vc->vc_font.height/3; 355 break; 356 case CUR_LOWER_HALF: 357 cur_height = vc->vc_font.height >> 1; 358 break; 359 case CUR_TWO_THIRDS: 360 cur_height = (vc->vc_font.height << 1)/3; 361 break; 362 case CUR_BLOCK: 363 default: 364 cur_height = vc->vc_font.height; 365 break; 366 } 367 size = (vc->vc_font.height - cur_height) * w; 368 while (size--) 369 mask[i++] = ~msk; 370 size = cur_height * w; 371 while (size--) 372 mask[i++] = msk; 373 } 374 375 par->cursor_state.enable = enable && !use_sw; 376 377 cursor.image.data = src; 378 cursor.image.fg_color = par->cursor_state.image.fg_color; 379 cursor.image.bg_color = par->cursor_state.image.bg_color; 380 cursor.image.dx = par->cursor_state.image.dx; 381 cursor.image.dy = par->cursor_state.image.dy; 382 cursor.image.height = par->cursor_state.image.height; 383 cursor.image.width = par->cursor_state.image.width; 384 cursor.hot.x = par->cursor_state.hot.x; 385 cursor.hot.y = par->cursor_state.hot.y; 386 cursor.mask = par->cursor_state.mask; 387 cursor.enable = par->cursor_state.enable; 388 cursor.image.depth = 1; 389 cursor.rop = ROP_XOR; 390 391 if (info->fbops->fb_cursor) 392 err = info->fbops->fb_cursor(info, &cursor); 393 394 if (err) 395 soft_cursor(info, &cursor); 396 397 par->cursor_reset = 0; 398} 399 400static int bit_update_start(struct fb_info *info) 401{ 402 struct fbcon_par *par = info->fbcon_par; 403 int err; 404 405 err = fb_pan_display(info, &par->var); 406 par->var.xoffset = info->var.xoffset; 407 par->var.yoffset = info->var.yoffset; 408 par->var.vmode = info->var.vmode; 409 return err; 410} 411 412static const struct fbcon_bitops bit_fbcon_bitops = { 413 .bmove = bit_bmove, 414 .clear = bit_clear, 415 .putcs = bit_putcs, 416 .clear_margins = bit_clear_margins, 417 .cursor = bit_cursor, 418 .update_start = bit_update_start, 419}; 420 421void fbcon_set_bitops_ur(struct fbcon_par *par) 422{ 423 par->bitops = &bit_fbcon_bitops; 424}
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