1 /* ----------------------------------------------------------------------- * 2 * 3 * Copyright 2006-2008 H. Peter Anvin - All Rights Reserved 4 * 5 * Permission is hereby granted, free of charge, to any person 6 * obtaining a copy of this software and associated documentation 7 * files (the "Software"), to deal in the Software without 8 * restriction, including without limitation the rights to use, 9 * copy, modify, merge, publish, distribute, sublicense, and/or 10 * sell copies of the Software, and to permit persons to whom 11 * the Software is furnished to do so, subject to the following 12 * conditions: 13 * 14 * The above copyright notice and this permission notice shall 15 * be included in all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES 19 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 20 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 21 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 22 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 23 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 24 * OTHER DEALINGS IN THE SOFTWARE. 25 * 26 * ----------------------------------------------------------------------- */ 27 28 #include <stdio.h> 29 #include <png.h> 30 #include <tinyjpeg.h> 31 #include <com32.h> 32 #include <unistd.h> 33 #include <stdlib.h> 34 #include <sys/stat.h> 35 #include <minmax.h> 36 #include <stdbool.h> 37 #include <ilog2.h> 38 #include <syslinux/loadfile.h> 39 #include "vesa.h" 40 #include "video.h" 41 42 /*** FIX: This really should be alpha-blended with color index 0 ***/ 43 44 /* For best performance, "start" should be a multiple of 4, to assure 45 aligned dwords. */ 46 static void draw_background_line(int line, int start, int npixels) 47 { 48 uint32_t *bgptr = &__vesacon_background[line*__vesa_info.mi.h_res+start]; 49 unsigned int bytes_per_pixel = __vesacon_bytes_per_pixel; 50 size_t fbptr = line * __vesa_info.mi.logical_scan + start*bytes_per_pixel; 51 52 __vesacon_copy_to_screen(fbptr, bgptr, npixels); 53 } 54 55 /* This draws the border, then redraws the text area */ 56 static void draw_background(void) 57 { 58 int i; 59 const int bottom_border = VIDEO_BORDER + 60 (TEXT_PIXEL_ROWS % __vesacon_font_height); 61 const int right_border = VIDEO_BORDER + (TEXT_PIXEL_COLS % FONT_WIDTH); 62 63 for (i = 0; i < VIDEO_BORDER; i++) 64 draw_background_line(i, 0, __vesa_info.mi.h_res); 65 66 for (i = VIDEO_BORDER; i < __vesa_info.mi.v_res - bottom_border; i++) { 67 draw_background_line(i, 0, VIDEO_BORDER); 68 draw_background_line(i, __vesa_info.mi.h_res - right_border, 69 right_border); 70 } 71 72 for (i = __vesa_info.mi.v_res - bottom_border; 73 i < __vesa_info.mi.v_res; i++) 74 draw_background_line(i, 0, __vesa_info.mi.h_res); 75 76 __vesacon_redraw_text(); 77 } 78 79 /* 80 * Tile an image in the UL corner across the entire screen 81 */ 82 static void tile_image(int width, int height) 83 { 84 int xsize = __vesa_info.mi.h_res; 85 int ysize = __vesa_info.mi.v_res; 86 int x, y, yr; 87 int xl, yl; 88 uint32_t *sp, *dp, *drp, *dtp; 89 90 drp = __vesacon_background; 91 for (y = 0 ; y < ysize ; y += height) { 92 yl = min(height, ysize-y); 93 dtp = drp; 94 for (x = 0 ; x < xsize ; x += width) { 95 xl = min(width, xsize-x); 96 if (x || y) { 97 sp = __vesacon_background; 98 dp = dtp; 99 for (yr = 0 ; yr < yl ; yr++) { 100 memcpy(dp, sp, xl*sizeof(uint32_t)); 101 dp += xsize; 102 sp += xsize; 103 } 104 } 105 dtp += xl; 106 } 107 drp += xsize*height; 108 } 109 } 110 111 static int read_png_file(FILE * fp) 112 { 113 png_structp png_ptr = NULL; 114 png_infop info_ptr = NULL; 115 #if 0 116 png_color_16p image_background; 117 static const png_color_16 my_background = { 0, 0, 0, 0, 0 }; 118 #endif 119 png_bytep row_pointers[__vesa_info.mi.v_res], rp; 120 int i; 121 int rv = -1; 122 123 png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); 124 info_ptr = png_create_info_struct(png_ptr); 125 126 if (!png_ptr || !info_ptr || setjmp(png_jmpbuf(png_ptr))) 127 goto err; 128 129 png_init_io(png_ptr, fp); 130 png_set_sig_bytes(png_ptr, 8); 131 132 png_set_user_limits(png_ptr, __vesa_info.mi.h_res, __vesa_info.mi.v_res); 133 134 png_read_info(png_ptr, info_ptr); 135 136 /* Set the appropriate set of transformations. We need to end up 137 with 32-bit BGRA format, no more, no less. */ 138 139 /* Expand to RGB first... */ 140 if (info_ptr->color_type & PNG_COLOR_MASK_PALETTE) 141 png_set_palette_to_rgb(png_ptr); 142 else if (!(info_ptr->color_type & PNG_COLOR_MASK_COLOR)) 143 png_set_gray_to_rgb(png_ptr); 144 145 /* Add alpha channel, if need be */ 146 if (!(png_ptr->color_type & PNG_COLOR_MASK_ALPHA)) { 147 if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) 148 png_set_tRNS_to_alpha(png_ptr); 149 else 150 png_set_add_alpha(png_ptr, ~0, PNG_FILLER_AFTER); 151 } 152 153 /* Adjust the byte order, if necessary */ 154 png_set_bgr(png_ptr); 155 156 /* Make sure we end up with 8-bit data */ 157 if (info_ptr->bit_depth == 16) 158 png_set_strip_16(png_ptr); 159 else if (info_ptr->bit_depth < 8) 160 png_set_packing(png_ptr); 161 162 #if 0 163 if (png_get_bKGD(png_ptr, info_ptr, &image_background)) 164 png_set_background(png_ptr, image_background, 165 PNG_BACKGROUND_GAMMA_FILE, 1, 1.0); 166 else 167 png_set_background(png_ptr, &my_background, 168 PNG_BACKGROUND_GAMMA_SCREEN, 0, 1.0); 169 #endif 170 171 /* Whew! Now we should get the stuff we want... */ 172 rp = (png_bytep)__vesacon_background; 173 for (i = 0; i < (int)info_ptr->height; i++) { 174 row_pointers[i] = rp; 175 rp += __vesa_info.mi.h_res << 2; 176 } 177 178 png_read_image(png_ptr, row_pointers); 179 180 tile_image(info_ptr->width, info_ptr->height); 181 182 rv = 0; 183 184 err: 185 if (png_ptr) 186 png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp) NULL); 187 return rv; 188 } 189 190 static int jpeg_sig_cmp(uint8_t * bytes, int len) 191 { 192 (void)len; 193 194 return (bytes[0] == 0xff && bytes[1] == 0xd8) ? 0 : -1; 195 } 196 197 static int read_jpeg_file(FILE * fp, uint8_t * header, int len) 198 { 199 struct jdec_private *jdec = NULL; 200 void *jpeg_file = NULL; 201 size_t length_of_file; 202 unsigned int width, height; 203 int rv = -1; 204 unsigned char *components[1]; 205 unsigned int bytes_per_row[1]; 206 207 rv = floadfile(fp, &jpeg_file, &length_of_file, header, len); 208 if (rv) 209 goto err; 210 211 jdec = tinyjpeg_init(); 212 if (!jdec) 213 goto err; 214 215 if (tinyjpeg_parse_header(jdec, jpeg_file, length_of_file) < 0) 216 goto err; 217 218 tinyjpeg_get_size(jdec, &width, &height); 219 if (width > __vesa_info.mi.h_res || height > __vesa_info.mi.v_res) 220 goto err; 221 222 components[0] = (void *)__vesacon_background; 223 tinyjpeg_set_components(jdec, components, 1); 224 bytes_per_row[0] = __vesa_info.mi.h_res << 2; 225 tinyjpeg_set_bytes_per_row(jdec, bytes_per_row, 1); 226 227 tinyjpeg_decode(jdec, TINYJPEG_FMT_BGRA32); 228 tile_image(width, height); 229 230 rv = 0; 231 232 err: 233 /* Don't use tinyjpeg_free() here, since we didn't allow tinyjpeg 234 to allocate the frame buffer */ 235 if (jdec) 236 free(jdec); 237 238 if (jpeg_file) 239 free(jpeg_file); 240 241 return rv; 242 } 243 244 /* Simple grey Gaussian hole, enough to look interesting */ 245 int vesacon_default_background(void) 246 { 247 int x, y, dx, dy, dy2; 248 int z; 249 unsigned int shft; 250 uint8_t *bgptr = (uint8_t *)__vesacon_background; 251 uint8_t k; 252 253 if (__vesacon_pixel_format == PXF_NONE) 254 return 0; /* Not in graphics mode */ 255 256 z = max(__vesa_info.mi.v_res, __vesa_info.mi.h_res) >> 1; 257 z = ((z*z) >> 11) - 1; 258 shft = ilog2(z) + 1; 259 260 for (y = 0, dy = -(__vesa_info.mi.v_res >> 1); 261 y < __vesa_info.mi.v_res; y++, dy++) { 262 dy2 = dy * dy; 263 for (x = 0, dx = -(__vesa_info.mi.h_res >> 1); 264 x < __vesa_info.mi.h_res; x++, dx++) { 265 k = __vesacon_linear_to_srgb[500 + ((dx*dx + dy2) >> shft)]; 266 bgptr[0] = k; /* Blue */ 267 bgptr[1] = k; /* Green */ 268 bgptr[2] = k; /* Red */ 269 bgptr += 4; /* Dummy alpha */ 270 } 271 } 272 273 draw_background(); 274 return 0; 275 } 276 277 /* Set the background to a single flat color */ 278 int vesacon_set_background(unsigned int rgb) 279 { 280 void *bgptr = __vesacon_background; 281 unsigned int count = __vesa_info.mi.h_res * __vesa_info.mi.v_res; 282 283 if (__vesacon_pixel_format == PXF_NONE) 284 return 0; /* Not in graphics mode */ 285 286 asm volatile ("rep; stosl":"+D" (bgptr), "+c"(count) 287 :"a"(rgb) 288 :"memory"); 289 290 draw_background(); 291 return 0; 292 } 293 294 struct lss16_header { 295 uint32_t magic; 296 uint16_t xsize; 297 uint16_t ysize; 298 }; 299 300 #define LSS16_MAGIC 0x1413f33d 301 302 static inline int lss16_sig_cmp(const void *header, int len) 303 { 304 const struct lss16_header *h = header; 305 306 if (len != 8) 307 return 1; 308 309 return !(h->magic == LSS16_MAGIC && 310 h->xsize <= __vesa_info.mi.h_res && 311 h->ysize <= __vesa_info.mi.v_res); 312 } 313 314 static int read_lss16_file(FILE * fp, const void *header, int header_len) 315 { 316 const struct lss16_header *h = header; 317 uint32_t colors[16], color; 318 bool has_nybble; 319 uint8_t byte; 320 int count; 321 int nybble, prev; 322 enum state { 323 st_start, 324 st_c0, 325 st_c1, 326 st_c2, 327 } state; 328 int i, x, y; 329 uint32_t *bgptr = __vesacon_background; 330 331 /* Assume the header, 8 bytes, has already been loaded. */ 332 if (header_len != 8) 333 return -1; 334 335 for (i = 0; i < 16; i++) { 336 uint8_t rgb[3]; 337 if (fread(rgb, 1, 3, fp) != 3) 338 return -1; 339 340 colors[i] = (((rgb[0] & 63) * 255 / 63) << 16) + 341 (((rgb[1] & 63) * 255 / 63) << 8) + 342 ((rgb[2] & 63) * 255 / 63); 343 } 344 345 /* By spec, the state machine is per row */ 346 for (y = 0; y < h->ysize; y++) { 347 state = st_start; 348 has_nybble = false; 349 color = colors[prev = 0]; /* By specification */ 350 count = 0; 351 352 x = 0; 353 while (x < h->xsize) { 354 if (!has_nybble) { 355 if (fread(&byte, 1, 1, fp) != 1) 356 return -1; 357 nybble = byte & 0xf; 358 has_nybble = true; 359 } else { 360 nybble = byte >> 4; 361 has_nybble = false; 362 } 363 364 switch (state) { 365 case st_start: 366 if (nybble != prev) { 367 *bgptr++ = color = colors[prev = nybble]; 368 x++; 369 } else { 370 state = st_c0; 371 } 372 break; 373 374 case st_c0: 375 if (nybble == 0) { 376 state = st_c1; 377 } else { 378 count = nybble; 379 goto do_run; 380 } 381 break; 382 383 case st_c1: 384 count = nybble + 16; 385 state = st_c2; 386 break; 387 388 case st_c2: 389 count += nybble << 4; 390 goto do_run; 391 392 do_run: 393 count = min(count, h->xsize - x); 394 x += count; 395 asm volatile ("rep; stosl":"+D" (bgptr), 396 "+c"(count):"a"(color)); 397 state = st_start; 398 break; 399 } 400 } 401 402 /* Zero-fill rest of row */ 403 i = __vesa_info.mi.h_res - x; 404 asm volatile ("rep; stosl":"+D" (bgptr), "+c"(i):"a"(0):"memory"); 405 } 406 407 /* Zero-fill rest of screen */ 408 i = (__vesa_info.mi.v_res - y) * __vesa_info.mi.h_res; 409 asm volatile ("rep; stosl":"+D" (bgptr), "+c"(i):"a"(0):"memory"); 410 411 return 0; 412 } 413 414 int vesacon_load_background(const char *filename) 415 { 416 FILE *fp = NULL; 417 uint8_t header[8]; 418 int rv = 1; 419 420 if (__vesacon_pixel_format == PXF_NONE) 421 return 0; /* Not in graphics mode */ 422 423 fp = fopen(filename, "r"); 424 425 if (!fp) 426 goto err; 427 428 if (fread(header, 1, 8, fp) != 8) 429 goto err; 430 431 if (!png_sig_cmp(header, 0, 8)) { 432 rv = read_png_file(fp); 433 } else if (!jpeg_sig_cmp(header, 8)) { 434 rv = read_jpeg_file(fp, header, 8); 435 } else if (!lss16_sig_cmp(header, 8)) { 436 rv = read_lss16_file(fp, header, 8); 437 } 438 439 /* This actually displays the stuff */ 440 draw_background(); 441 442 err: 443 if (fp) 444 fclose(fp); 445 446 return rv; 447 } 448 449 int __vesacon_init_background(void) 450 { 451 /* __vesacon_background was cleared by calloc() */ 452 453 /* The VESA BIOS has already cleared the screen */ 454 return 0; 455 } 456
