1 /* 2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 12 /**************************************************************************** 13 * 14 * Module Title : scale.c 15 * 16 * Description : Image scaling functions. 17 * 18 ***************************************************************************/ 19 20 /**************************************************************************** 21 * Header Files 22 ****************************************************************************/ 23 #include "vpx_mem/vpx_mem.h" 24 #include "vpx_scale/yv12config.h" 25 #include "vpx_scale/scale_mode.h" 26 27 /**************************************************************************** 28 * Exports 29 ****************************************************************************/ 30 #ifndef VPX_NO_GLOBALS 31 void (*vp8_vertical_band_4_5_scale)(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) = 0; 32 void (*vp8_last_vertical_band_4_5_scale)(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) = 0; 33 void (*vp8_vertical_band_2_3_scale)(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) = 0; 34 void (*vp8_last_vertical_band_2_3_scale)(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) = 0; 35 void (*vp8_vertical_band_3_5_scale)(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) = 0; 36 void (*vp8_last_vertical_band_3_5_scale)(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) = 0; 37 void (*vp8_vertical_band_3_4_scale)(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) = 0; 38 void (*vp8_last_vertical_band_3_4_scale)(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) = 0; 39 void (*vp8_horizontal_line_1_2_scale)(const unsigned char *source, unsigned int source_width, unsigned char *dest, unsigned int dest_width) = 0; 40 void (*vp8_horizontal_line_3_5_scale)(const unsigned char *source, unsigned int source_width, unsigned char *dest, unsigned int dest_width) = 0; 41 void (*vp8_horizontal_line_3_4_scale)(const unsigned char *source, unsigned int source_width, unsigned char *dest, unsigned int dest_width) = 0; 42 void (*vp8_horizontal_line_2_3_scale)(const unsigned char *source, unsigned int source_width, unsigned char *dest, unsigned int dest_width) = 0; 43 void (*vp8_horizontal_line_4_5_scale)(const unsigned char *source, unsigned int source_width, unsigned char *dest, unsigned int dest_width) = 0; 44 void (*vp8_vertical_band_1_2_scale)(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) = 0; 45 void (*vp8_last_vertical_band_1_2_scale)(unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) = 0; 46 47 void (*vp8_vertical_band_5_4_scale)(unsigned char *source, unsigned int src_pitch, unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) = 0; 48 void (*vp8_vertical_band_5_3_scale)(unsigned char *source, unsigned int src_pitch, unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) = 0; 49 void (*vp8_vertical_band_2_1_scale)(unsigned char *source, unsigned int src_pitch, unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) = 0; 50 void (*vp8_vertical_band_2_1_scale_i)(unsigned char *source, unsigned int src_pitch, unsigned char *dest, unsigned int dest_pitch, unsigned int dest_width) = 0; 51 void (*vp8_horizontal_line_2_1_scale)(const unsigned char *source, unsigned int source_width, unsigned char *dest, unsigned int dest_width) = 0; 52 void (*vp8_horizontal_line_5_3_scale)(const unsigned char *source, unsigned int source_width, unsigned char *dest, unsigned int dest_width) = 0; 53 void (*vp8_horizontal_line_5_4_scale)(const unsigned char *source, unsigned int source_width, unsigned char *dest, unsigned int dest_width) = 0; 54 #else 55 # include "vpxscale_nofp.h" 56 #endif 57 58 typedef struct 59 { 60 int expanded_frame_width; 61 int expanded_frame_height; 62 63 int HScale; 64 int HRatio; 65 int VScale; 66 int VRatio; 67 68 YV12_BUFFER_CONFIG *src_yuv_config; 69 YV12_BUFFER_CONFIG *dst_yuv_config; 70 71 } SCALE_VARS; 72 73 /**************************************************************************** 74 * 75 * ROUTINE : horizontal_line_copy 76 * 77 * INPUTS : None 78 * 79 * 80 * OUTPUTS : None. 81 * 82 * RETURNS : None 83 * 84 * FUNCTION : 1 to 1 scaling up for a horizontal line of pixles 85 * 86 * SPECIAL NOTES : None. 87 * 88 * ERRORS : None. 89 * 90 ****************************************************************************/ 91 static 92 void horizontal_line_copy( 93 const unsigned char *source, 94 unsigned int source_width, 95 unsigned char *dest, 96 unsigned int dest_width 97 ) 98 { 99 (void) dest_width; 100 101 duck_memcpy(dest, source, source_width); 102 } 103 /**************************************************************************** 104 * 105 * ROUTINE : null_scale 106 * 107 * INPUTS : None 108 * 109 * 110 * OUTPUTS : None. 111 * 112 * RETURNS : None 113 * 114 * FUNCTION : 1 to 1 scaling up for a vertical band 115 * 116 * SPECIAL NOTES : None. 117 * 118 * ERRORS : None. 119 * 120 ****************************************************************************/ 121 static 122 void null_scale( 123 unsigned char *dest, 124 unsigned int dest_pitch, 125 unsigned int dest_width 126 ) 127 { 128 (void) dest; 129 (void) dest_pitch; 130 (void) dest_width; 131 132 return; 133 } 134 135 /**************************************************************************** 136 * 137 * ROUTINE : scale1d_2t1_i 138 * 139 * INPUTS : const unsigned char *source : Pointer to data to be scaled. 140 * int source_step : Number of pixels to step on in source. 141 * unsigned int source_scale : Scale for source (UNUSED). 142 * unsigned int source_length : Length of source (UNUSED). 143 * unsigned char *dest : Pointer to output data array. 144 * int dest_step : Number of pixels to step on in destination. 145 * unsigned int dest_scale : Scale for destination (UNUSED). 146 * unsigned int dest_length : Length of destination. 147 * 148 * OUTPUTS : None. 149 * 150 * RETURNS : void 151 * 152 * FUNCTION : Performs 2-to-1 interpolated scaling. 153 * 154 * SPECIAL NOTES : None. 155 * 156 ****************************************************************************/ 157 static 158 void scale1d_2t1_i 159 ( 160 const unsigned char *source, 161 int source_step, 162 unsigned int source_scale, 163 unsigned int source_length, 164 unsigned char *dest, 165 int dest_step, 166 unsigned int dest_scale, 167 unsigned int dest_length 168 ) 169 { 170 unsigned int i, j; 171 unsigned int temp; 172 int source_pitch = source_step; 173 (void) source_length; 174 (void) source_scale; 175 (void) dest_scale; 176 177 source_step *= 2; 178 dest[0] = source[0]; 179 180 for (i = dest_step, j = source_step; i < dest_length * dest_step; i += dest_step, j += source_step) 181 { 182 temp = 8; 183 temp += 3 * source[j-source_pitch]; 184 temp += 10 * source[j]; 185 temp += 3 * source[j+source_pitch]; 186 temp >>= 4; 187 dest[i] = (char)(temp); 188 } 189 } 190 191 /**************************************************************************** 192 * 193 * ROUTINE : scale1d_2t1_ps 194 * 195 * INPUTS : const unsigned char *source : Pointer to data to be scaled. 196 * int source_step : Number of pixels to step on in source. 197 * unsigned int source_scale : Scale for source (UNUSED). 198 * unsigned int source_length : Length of source (UNUSED). 199 * unsigned char *dest : Pointer to output data array. 200 * int dest_step : Number of pixels to step on in destination. 201 * unsigned int dest_scale : Scale for destination (UNUSED). 202 * unsigned int dest_length : Length of destination. 203 * 204 * OUTPUTS : None. 205 * 206 * RETURNS : void 207 * 208 * FUNCTION : Performs 2-to-1 point subsampled scaling. 209 * 210 * SPECIAL NOTES : None. 211 * 212 ****************************************************************************/ 213 static 214 void scale1d_2t1_ps 215 ( 216 const unsigned char *source, 217 int source_step, 218 unsigned int source_scale, 219 unsigned int source_length, 220 unsigned char *dest, 221 int dest_step, 222 unsigned int dest_scale, 223 unsigned int dest_length 224 ) 225 { 226 unsigned int i, j; 227 228 (void) source_length; 229 (void) source_scale; 230 (void) dest_scale; 231 232 source_step *= 2; 233 j = 0; 234 235 for (i = 0; i < dest_length * dest_step; i += dest_step, j += source_step) 236 dest[i] = source[j]; 237 } 238 /**************************************************************************** 239 * 240 * ROUTINE : scale1d_c 241 * 242 * INPUTS : const unsigned char *source : Pointer to data to be scaled. 243 * int source_step : Number of pixels to step on in source. 244 * unsigned int source_scale : Scale for source. 245 * unsigned int source_length : Length of source (UNUSED). 246 * unsigned char *dest : Pointer to output data array. 247 * int dest_step : Number of pixels to step on in destination. 248 * unsigned int dest_scale : Scale for destination. 249 * unsigned int dest_length : Length of destination. 250 * 251 * OUTPUTS : None. 252 * 253 * RETURNS : void 254 * 255 * FUNCTION : Performs linear interpolation in one dimension. 256 * 257 * SPECIAL NOTES : None. 258 * 259 ****************************************************************************/ 260 static 261 void scale1d_c 262 ( 263 const unsigned char *source, 264 int source_step, 265 unsigned int source_scale, 266 unsigned int source_length, 267 unsigned char *dest, 268 int dest_step, 269 unsigned int dest_scale, 270 unsigned int dest_length 271 ) 272 { 273 unsigned int i; 274 unsigned int round_value = dest_scale / 2; 275 unsigned int left_modifier = dest_scale; 276 unsigned int right_modifier = 0; 277 unsigned char left_pixel = *source; 278 unsigned char right_pixel = *(source + source_step); 279 280 (void) source_length; 281 282 // These asserts are needed if there are boundary issues... 283 //assert ( dest_scale > source_scale ); 284 //assert ( (source_length-1) * dest_scale >= (dest_length-1) * source_scale ); 285 286 for (i = 0; i < dest_length * dest_step; i += dest_step) 287 { 288 dest[i] = (char)((left_modifier * left_pixel + right_modifier * right_pixel + round_value) / dest_scale); 289 290 right_modifier += source_scale; 291 292 while (right_modifier > dest_scale) 293 { 294 right_modifier -= dest_scale; 295 source += source_step; 296 left_pixel = *source; 297 right_pixel = *(source + source_step); 298 } 299 300 left_modifier = dest_scale - right_modifier; 301 } 302 } 303 304 /**************************************************************************** 305 * 306 * ROUTINE : Scale2D 307 * 308 * INPUTS : const unsigned char *source : Pointer to data to be scaled. 309 * int source_pitch : Stride of source image. 310 * unsigned int source_width : Width of input image. 311 * unsigned int source_height : Height of input image. 312 * unsigned char *dest : Pointer to output data array. 313 * int dest_pitch : Stride of destination image. 314 * unsigned int dest_width : Width of destination image. 315 * unsigned int dest_height : Height of destination image. 316 * unsigned char *temp_area : Pointer to temp work area. 317 * unsigned char temp_area_height : Height of temp work area. 318 * unsigned int hscale : Horizontal scale factor numerator. 319 * unsigned int hratio : Horizontal scale factor denominator. 320 * unsigned int vscale : Vertical scale factor numerator. 321 * unsigned int vratio : Vertical scale factor denominator. 322 * unsigned int interlaced : Interlace flag. 323 * 324 * OUTPUTS : None. 325 * 326 * RETURNS : void 327 * 328 * FUNCTION : Performs 2-tap linear interpolation in two dimensions. 329 * 330 * SPECIAL NOTES : Expansion is performed one band at a time to help with 331 * caching. 332 * 333 ****************************************************************************/ 334 static 335 void Scale2D 336 ( 337 //const 338 unsigned char *source, 339 int source_pitch, 340 unsigned int source_width, 341 unsigned int source_height, 342 unsigned char *dest, 343 int dest_pitch, 344 unsigned int dest_width, 345 unsigned int dest_height, 346 unsigned char *temp_area, 347 unsigned char temp_area_height, 348 unsigned int hscale, 349 unsigned int hratio, 350 unsigned int vscale, 351 unsigned int vratio, 352 unsigned int interlaced 353 ) 354 { 355 //unsigned 356 int i, j, k; 357 int bands; 358 int dest_band_height; 359 int source_band_height; 360 361 typedef void (*Scale1D)(const unsigned char * source, int source_step, unsigned int source_scale, unsigned int source_length, 362 unsigned char * dest, int dest_step, unsigned int dest_scale, unsigned int dest_length); 363 364 Scale1D Scale1Dv = scale1d_c; 365 Scale1D Scale1Dh = scale1d_c; 366 367 void (*horiz_line_scale)(const unsigned char *, unsigned int, unsigned char *, unsigned int) = NULL; 368 void (*vert_band_scale)(unsigned char *, unsigned int, unsigned char *, unsigned int, unsigned int) = NULL; 369 370 int ratio_scalable = 1; 371 int interpolation = 0; 372 373 unsigned char *source_base; // = (unsigned char *) ((source_pitch >= 0) ? source : (source + ((source_height-1) * source_pitch))); 374 unsigned char *line_src; 375 376 377 source_base = (unsigned char *)source; 378 379 if (source_pitch < 0) 380 { 381 int offset; 382 383 offset = (source_height - 1); 384 offset *= source_pitch; 385 386 source_base += offset; 387 } 388 389 // find out the ratio for each direction 390 switch (hratio * 10 / hscale) 391 { 392 case 8: 393 // 4-5 Scale in Width direction 394 horiz_line_scale = vp8_horizontal_line_5_4_scale; 395 break; 396 case 6: 397 // 3-5 Scale in Width direction 398 horiz_line_scale = vp8_horizontal_line_5_3_scale; 399 break; 400 case 5: 401 // 1-2 Scale in Width direction 402 horiz_line_scale = vp8_horizontal_line_2_1_scale; 403 break; 404 default: 405 // The ratio is not acceptable now 406 // throw("The ratio is not acceptable for now!"); 407 ratio_scalable = 0; 408 break; 409 } 410 411 switch (vratio * 10 / vscale) 412 { 413 case 8: 414 // 4-5 Scale in vertical direction 415 vert_band_scale = vp8_vertical_band_5_4_scale; 416 source_band_height = 5; 417 dest_band_height = 4; 418 break; 419 case 6: 420 // 3-5 Scale in vertical direction 421 vert_band_scale = vp8_vertical_band_5_3_scale; 422 source_band_height = 5; 423 dest_band_height = 3; 424 break; 425 case 5: 426 // 1-2 Scale in vertical direction 427 428 if (interlaced) 429 { 430 //if the content is interlaced, point sampling is used 431 vert_band_scale = vp8_vertical_band_2_1_scale; 432 } 433 else 434 { 435 436 interpolation = 1; 437 //if the content is progressive, interplo 438 vert_band_scale = vp8_vertical_band_2_1_scale_i; 439 440 } 441 442 source_band_height = 2; 443 dest_band_height = 1; 444 break; 445 default: 446 // The ratio is not acceptable now 447 // throw("The ratio is not acceptable for now!"); 448 ratio_scalable = 0; 449 break; 450 } 451 452 if (ratio_scalable) 453 { 454 if (source_height == dest_height) 455 { 456 // for each band of the image 457 for (k = 0; k < (int)dest_height; k++) 458 { 459 horiz_line_scale(source, source_width, dest, dest_width); 460 source += source_pitch; 461 dest += dest_pitch; 462 } 463 464 return; 465 } 466 467 if (interpolation) 468 { 469 if (source < source_base) 470 source = source_base; 471 472 horiz_line_scale(source, source_width, temp_area, dest_width); 473 } 474 475 for (k = 0; k < (int)(dest_height + dest_band_height - 1) / dest_band_height; k++) 476 { 477 // scale one band horizontally 478 for (i = 0; i < source_band_height; i++) 479 { 480 // Trap case where we could read off the base of the source buffer 481 482 line_src = (unsigned char *)source + i * source_pitch; 483 484 if (line_src < source_base) 485 line_src = source_base; 486 487 horiz_line_scale(line_src, source_width, 488 temp_area + (i + 1)*dest_pitch, dest_width); 489 } 490 491 // Vertical scaling is in place 492 vert_band_scale(temp_area + dest_pitch, dest_pitch, dest, dest_pitch, dest_width); 493 494 if (interpolation) 495 vpx_memcpy(temp_area, temp_area + source_band_height * dest_pitch, dest_width); 496 497 // Next band... 498 source += (unsigned long) source_band_height * source_pitch; 499 dest += (unsigned long) dest_band_height * dest_pitch; 500 } 501 502 return; 503 } 504 505 if (hscale == 2 && hratio == 1) 506 Scale1Dh = scale1d_2t1_ps; 507 508 if (vscale == 2 && vratio == 1) 509 { 510 if (interlaced) 511 Scale1Dv = scale1d_2t1_ps; 512 else 513 Scale1Dv = scale1d_2t1_i; 514 } 515 516 if (source_height == dest_height) 517 { 518 // for each band of the image 519 for (k = 0; k < (int)dest_height; k++) 520 { 521 Scale1Dh(source, 1, hscale, source_width + 1, dest, 1, hratio, dest_width); 522 source += source_pitch; 523 dest += dest_pitch; 524 } 525 526 return; 527 } 528 529 if (dest_height > source_height) 530 { 531 dest_band_height = temp_area_height - 1; 532 source_band_height = dest_band_height * source_height / dest_height; 533 } 534 else 535 { 536 source_band_height = temp_area_height - 1; 537 dest_band_height = source_band_height * vratio / vscale; 538 } 539 540 // first row needs to be done so that we can stay one row ahead for vertical zoom 541 Scale1Dh(source, 1, hscale, source_width + 1, temp_area, 1, hratio, dest_width); 542 543 // for each band of the image 544 bands = (dest_height + dest_band_height - 1) / dest_band_height; 545 546 for (k = 0; k < bands; k++) 547 { 548 // scale one band horizontally 549 for (i = 1; i < source_band_height + 1; i++) 550 { 551 if (k * source_band_height + i < (int) source_height) 552 { 553 Scale1Dh(source + i * source_pitch, 1, hscale, source_width + 1, 554 temp_area + i * dest_pitch, 1, hratio, dest_width); 555 } 556 else // Duplicate the last row 557 { 558 // copy temp_area row 0 over from last row in the past 559 duck_memcpy(temp_area + i * dest_pitch, temp_area + (i - 1)*dest_pitch, dest_pitch); 560 } 561 } 562 563 // scale one band vertically 564 for (j = 0; j < (int)dest_width; j++) 565 { 566 Scale1Dv(&temp_area[j], dest_pitch, vscale, source_band_height + 1, 567 &dest[j], dest_pitch, vratio, dest_band_height); 568 } 569 570 // copy temp_area row 0 over from last row in the past 571 duck_memcpy(temp_area, temp_area + source_band_height * dest_pitch, dest_pitch); 572 573 // move to the next band 574 source += source_band_height * source_pitch; 575 dest += dest_band_height * dest_pitch; 576 } 577 } 578 579 /**************************************************************************** 580 * 581 * ROUTINE : 582 * 583 * INPUTS : YV12_BUFFER_CONFIG *src : Pointer to frame to be scaled. 584 * YV12_BUFFER_CONFIG *dst : Pointer to buffer to hold scaled frame. 585 * unsigned char *temp_area : Pointer to temp work area. 586 * unsigned char temp_area_height : Height of temp work area. 587 * unsigned int hscale : Horizontal scale factor numerator. 588 * unsigned int hratio : Horizontal scale factor denominator. 589 * unsigned int vscale : Vertical scale factor numerator. 590 * unsigned int vratio : Vertical scale factor denominator. 591 * unsigned int interlaced : Interlace flag. 592 * 593 * OUTPUTS : None. 594 * 595 * RETURNS : void 596 * 597 * FUNCTION : Performs 2-tap linear interpolation in two dimensions. 598 * 599 * SPECIAL NOTES : Expansion is performed one band at a time to help with 600 * caching. 601 * 602 ****************************************************************************/ 603 void vp8_scale_frame 604 ( 605 YV12_BUFFER_CONFIG *src, 606 YV12_BUFFER_CONFIG *dst, 607 unsigned char *temp_area, 608 unsigned char temp_height, 609 unsigned int hscale, 610 unsigned int hratio, 611 unsigned int vscale, 612 unsigned int vratio, 613 unsigned int interlaced 614 ) 615 { 616 int i; 617 int dw = (hscale - 1 + src->y_width * hratio) / hscale; 618 int dh = (vscale - 1 + src->y_height * vratio) / vscale; 619 620 // call our internal scaling routines!! 621 Scale2D((unsigned char *) src->y_buffer, src->y_stride, src->y_width, src->y_height, 622 (unsigned char *) dst->y_buffer, dst->y_stride, dw, dh, 623 temp_area, temp_height, hscale, hratio, vscale, vratio, interlaced); 624 625 if (dw < (int)dst->y_width) 626 for (i = 0; i < dh; i++) 627 duck_memset(dst->y_buffer + i * dst->y_stride + dw - 1, dst->y_buffer[i*dst->y_stride+dw-2], dst->y_width - dw + 1); 628 629 if (dh < (int)dst->y_height) 630 for (i = dh - 1; i < (int)dst->y_height; i++) 631 duck_memcpy(dst->y_buffer + i * dst->y_stride, dst->y_buffer + (dh - 2) * dst->y_stride, dst->y_width + 1); 632 633 Scale2D((unsigned char *) src->u_buffer, src->uv_stride, src->uv_width, src->uv_height, 634 (unsigned char *) dst->u_buffer, dst->uv_stride, dw / 2, dh / 2, 635 temp_area, temp_height, hscale, hratio, vscale, vratio, interlaced); 636 637 if (dw / 2 < (int)dst->uv_width) 638 for (i = 0; i < dst->uv_height; i++) 639 duck_memset(dst->u_buffer + i * dst->uv_stride + dw / 2 - 1, dst->u_buffer[i*dst->uv_stride+dw/2-2], dst->uv_width - dw / 2 + 1); 640 641 if (dh / 2 < (int)dst->uv_height) 642 for (i = dh / 2 - 1; i < (int)dst->y_height / 2; i++) 643 duck_memcpy(dst->u_buffer + i * dst->uv_stride, dst->u_buffer + (dh / 2 - 2)*dst->uv_stride, dst->uv_width); 644 645 Scale2D((unsigned char *) src->v_buffer, src->uv_stride, src->uv_width, src->uv_height, 646 (unsigned char *) dst->v_buffer, dst->uv_stride, dw / 2, dh / 2, 647 temp_area, temp_height, hscale, hratio, vscale, vratio, interlaced); 648 649 if (dw / 2 < (int)dst->uv_width) 650 for (i = 0; i < dst->uv_height; i++) 651 duck_memset(dst->v_buffer + i * dst->uv_stride + dw / 2 - 1, dst->v_buffer[i*dst->uv_stride+dw/2-2], dst->uv_width - dw / 2 + 1); 652 653 if (dh / 2 < (int) dst->uv_height) 654 for (i = dh / 2 - 1; i < (int)dst->y_height / 2; i++) 655 duck_memcpy(dst->v_buffer + i * dst->uv_stride, dst->v_buffer + (dh / 2 - 2)*dst->uv_stride, dst->uv_width); 656 } 657 /**************************************************************************** 658 * 659 * ROUTINE : any_ratio_2d_scale 660 * 661 * INPUTS : SCALE_INSTANCE *si : Pointer to post-processor instance (NOT USED). 662 * const unsigned char *source : Pointer to source image. 663 * unsigned int source_pitch : Stride of source image. 664 * unsigned int source_width : Width of source image. 665 * unsigned int source_height : Height of source image (NOT USED). 666 * unsigned char *dest : Pointer to destination image. 667 * unsigned int dest_pitch : Stride of destination image. 668 * unsigned int dest_width : Width of destination image. 669 * unsigned int dest_height : Height of destination image. 670 * 671 * OUTPUTS : None. 672 * 673 * RETURNS : int: 1 if image scaled, 0 if image could not be scaled. 674 * 675 * FUNCTION : Scale the image with changing apect ratio. 676 * 677 * SPECIAL NOTES : This scaling is a bi-linear scaling. Need to re-work the 678 * whole function for new scaling algorithm. 679 * 680 ****************************************************************************/ 681 static 682 int any_ratio_2d_scale 683 ( 684 SCALE_VARS *si, 685 const unsigned char *source, 686 int source_pitch, 687 unsigned int source_width, 688 unsigned int source_height, 689 unsigned char *dest, 690 unsigned int dest_pitch, 691 unsigned int dest_width, 692 unsigned int dest_height 693 ) 694 { 695 unsigned int i, k; 696 unsigned int src_band_height = 0; 697 unsigned int dest_band_height = 0; 698 699 // suggested scale factors 700 int hs = si->HScale; 701 int hr = si->HRatio; 702 int vs = si->VScale; 703 int vr = si->VRatio; 704 705 // assume the ratios are scalable instead of should be centered 706 int ratio_scalable = 1; 707 708 const unsigned char *source_base = ((source_pitch >= 0) ? source : (source + ((source_height - 1) * source_pitch))); 709 const unsigned char *line_src; 710 711 void (*horiz_line_scale)(const unsigned char *, unsigned int, unsigned char *, unsigned int) = NULL; 712 void (*vert_band_scale)(unsigned char *, unsigned int, unsigned int) = NULL; 713 void (*last_vert_band_scale)(unsigned char *, unsigned int, unsigned int) = NULL; 714 715 (void) si; 716 717 // find out the ratio for each direction 718 switch (hr * 30 / hs) 719 { 720 case 24: 721 // 4-5 Scale in Width direction 722 horiz_line_scale = vp8_horizontal_line_4_5_scale; 723 break; 724 case 22: 725 // 3-4 Scale in Width direction 726 horiz_line_scale = vp8_horizontal_line_3_4_scale; 727 break; 728 729 case 20: 730 // 4-5 Scale in Width direction 731 horiz_line_scale = vp8_horizontal_line_2_3_scale; 732 break; 733 case 18: 734 // 3-5 Scale in Width direction 735 horiz_line_scale = vp8_horizontal_line_3_5_scale; 736 break; 737 case 15: 738 // 1-2 Scale in Width direction 739 horiz_line_scale = vp8_horizontal_line_1_2_scale; 740 break; 741 case 30: 742 // no scale in Width direction 743 horiz_line_scale = horizontal_line_copy; 744 break; 745 default: 746 // The ratio is not acceptable now 747 // throw("The ratio is not acceptable for now!"); 748 ratio_scalable = 0; 749 break; 750 } 751 752 switch (vr * 30 / vs) 753 { 754 case 24: 755 // 4-5 Scale in vertical direction 756 vert_band_scale = vp8_vertical_band_4_5_scale; 757 last_vert_band_scale = vp8_last_vertical_band_4_5_scale; 758 src_band_height = 4; 759 dest_band_height = 5; 760 break; 761 case 22: 762 // 3-4 Scale in vertical direction 763 vert_band_scale = vp8_vertical_band_3_4_scale; 764 last_vert_band_scale = vp8_last_vertical_band_3_4_scale; 765 src_band_height = 3; 766 dest_band_height = 4; 767 break; 768 case 20: 769 // 2-3 Scale in vertical direction 770 vert_band_scale = vp8_vertical_band_2_3_scale; 771 last_vert_band_scale = vp8_last_vertical_band_2_3_scale; 772 src_band_height = 2; 773 dest_band_height = 3; 774 break; 775 case 18: 776 // 3-5 Scale in vertical direction 777 vert_band_scale = vp8_vertical_band_3_5_scale; 778 last_vert_band_scale = vp8_last_vertical_band_3_5_scale; 779 src_band_height = 3; 780 dest_band_height = 5; 781 break; 782 case 15: 783 // 1-2 Scale in vertical direction 784 vert_band_scale = vp8_vertical_band_1_2_scale; 785 last_vert_band_scale = vp8_last_vertical_band_1_2_scale; 786 src_band_height = 1; 787 dest_band_height = 2; 788 break; 789 case 30: 790 // no scale in Width direction 791 vert_band_scale = null_scale; 792 last_vert_band_scale = null_scale; 793 src_band_height = 4; 794 dest_band_height = 4; 795 break; 796 default: 797 // The ratio is not acceptable now 798 // throw("The ratio is not acceptable for now!"); 799 ratio_scalable = 0; 800 break; 801 } 802 803 if (ratio_scalable == 0) 804 return ratio_scalable; 805 806 horiz_line_scale(source, source_width, dest, dest_width); 807 808 // except last band 809 for (k = 0; k < (dest_height + dest_band_height - 1) / dest_band_height - 1; k++) 810 { 811 // scale one band horizontally 812 for (i = 1; i < src_band_height; i++) 813 { 814 // Trap case where we could read off the base of the source buffer 815 line_src = source + i * source_pitch; 816 817 if (line_src < source_base) 818 line_src = source_base; 819 820 horiz_line_scale(line_src, source_width, 821 dest + i * dest_pitch, dest_width); 822 } 823 824 // first line of next band 825 // Trap case where we could read off the base of the source buffer 826 line_src = source + src_band_height * source_pitch; 827 828 if (line_src < source_base) 829 line_src = source_base; 830 831 horiz_line_scale(line_src, source_width, 832 dest + dest_band_height * dest_pitch, 833 dest_width); 834 835 // Vertical scaling is in place 836 vert_band_scale(dest, dest_pitch, dest_width); 837 838 // Next band... 839 source += src_band_height * source_pitch; 840 dest += dest_band_height * dest_pitch; 841 } 842 843 // scale one band horizontally 844 for (i = 1; i < src_band_height; i++) 845 { 846 // Trap case where we could read off the base of the source buffer 847 line_src = source + i * source_pitch; 848 849 if (line_src < source_base) 850 line_src = source_base; 851 852 horiz_line_scale(line_src, source_width, 853 dest + i * dest_pitch, 854 dest_width); 855 } 856 857 // Vertical scaling is in place 858 last_vert_band_scale(dest, dest_pitch, dest_width); 859 860 return ratio_scalable; 861 } 862 863 /**************************************************************************** 864 * 865 * ROUTINE : any_ratio_frame_scale 866 * 867 * INPUTS : SCALE_INSTANCE *si : Pointer to post-processor instance (NOT USED). 868 * unsigned char *frame_buffer : Pointer to source image. 869 * int YOffset : Offset from start of buffer to Y samples. 870 * int UVOffset : Offset from start of buffer to UV samples. 871 * 872 * OUTPUTS : None. 873 * 874 * RETURNS : int: 1 if image scaled, 0 if image could not be scaled. 875 * 876 * FUNCTION : Scale the image with changing apect ratio. 877 * 878 * SPECIAL NOTES : None. 879 * 880 ****************************************************************************/ 881 static 882 int any_ratio_frame_scale(SCALE_VARS *scale_vars, int YOffset, int UVOffset) 883 { 884 int i; 885 int ew; 886 int eh; 887 888 // suggested scale factors 889 int hs = scale_vars->HScale; 890 int hr = scale_vars->HRatio; 891 int vs = scale_vars->VScale; 892 int vr = scale_vars->VRatio; 893 894 int ratio_scalable = 1; 895 896 int sw = (scale_vars->expanded_frame_width * hr + hs - 1) / hs; 897 int sh = (scale_vars->expanded_frame_height * vr + vs - 1) / vs; 898 int dw = scale_vars->expanded_frame_width; 899 int dh = scale_vars->expanded_frame_height; 900 YV12_BUFFER_CONFIG *src_yuv_config = scale_vars->src_yuv_config; 901 YV12_BUFFER_CONFIG *dst_yuv_config = scale_vars->dst_yuv_config; 902 903 if (hr == 3) 904 ew = (sw + 2) / 3 * 3 * hs / hr; 905 else 906 ew = (sw + 7) / 8 * 8 * hs / hr; 907 908 if (vr == 3) 909 eh = (sh + 2) / 3 * 3 * vs / vr; 910 else 911 eh = (sh + 7) / 8 * 8 * vs / vr; 912 913 ratio_scalable = any_ratio_2d_scale(scale_vars, 914 (const unsigned char *)src_yuv_config->y_buffer, 915 src_yuv_config->y_stride, sw, sh, 916 (unsigned char *) dst_yuv_config->y_buffer + YOffset, 917 dst_yuv_config->y_stride, dw, dh); 918 919 for (i = 0; i < eh; i++) 920 duck_memset(dst_yuv_config->y_buffer + YOffset + i * dst_yuv_config->y_stride + dw, 0, ew - dw); 921 922 for (i = dh; i < eh; i++) 923 duck_memset(dst_yuv_config->y_buffer + YOffset + i * dst_yuv_config->y_stride, 0, ew); 924 925 if (ratio_scalable == 0) 926 return ratio_scalable; 927 928 sw = (sw + 1) >> 1; 929 sh = (sh + 1) >> 1; 930 dw = (dw + 1) >> 1; 931 dh = (dh + 1) >> 1; 932 933 any_ratio_2d_scale(scale_vars, 934 (const unsigned char *)src_yuv_config->u_buffer, 935 src_yuv_config->y_stride / 2, sw, sh, 936 (unsigned char *)dst_yuv_config->u_buffer + UVOffset, 937 dst_yuv_config->uv_stride, dw, dh); 938 939 any_ratio_2d_scale(scale_vars, 940 (const unsigned char *)src_yuv_config->v_buffer, 941 src_yuv_config->y_stride / 2, sw, sh, 942 (unsigned char *)dst_yuv_config->v_buffer + UVOffset, 943 dst_yuv_config->uv_stride, dw, dh); 944 945 return ratio_scalable; 946 } 947 948 /**************************************************************************** 949 * 950 * ROUTINE : center_image 951 * 952 * INPUTS : SCALE_INSTANCE *si : Pointer to post-processor instance. 953 * 954 * OUTPUTS : None. 955 * 956 * RETURNS : void 957 * 958 * FUNCTION : Centers the image without scaling in the output buffer. 959 * 960 * SPECIAL NOTES : None. 961 * 962 ****************************************************************************/ 963 static void 964 center_image(YV12_BUFFER_CONFIG *src_yuv_config, YV12_BUFFER_CONFIG *dst_yuv_config) 965 { 966 int i; 967 int row_offset, col_offset; 968 unsigned char *src_data_pointer; 969 unsigned char *dst_data_pointer; 970 971 // center values 972 row_offset = (dst_yuv_config->y_height - src_yuv_config->y_height) / 2; 973 col_offset = (dst_yuv_config->y_width - src_yuv_config->y_width) / 2; 974 975 // Y's 976 src_data_pointer = src_yuv_config->y_buffer; 977 dst_data_pointer = (unsigned char *)dst_yuv_config->y_buffer + (row_offset * dst_yuv_config->y_stride) + col_offset; 978 979 for (i = 0; i < src_yuv_config->y_height; i++) 980 { 981 duck_memcpy(dst_data_pointer, src_data_pointer, src_yuv_config->y_width); 982 dst_data_pointer += dst_yuv_config->y_stride; 983 src_data_pointer += src_yuv_config->y_stride; 984 } 985 986 row_offset /= 2; 987 col_offset /= 2; 988 989 // U's 990 src_data_pointer = src_yuv_config->u_buffer; 991 dst_data_pointer = (unsigned char *)dst_yuv_config->u_buffer + (row_offset * dst_yuv_config->uv_stride) + col_offset; 992 993 for (i = 0; i < src_yuv_config->uv_height; i++) 994 { 995 duck_memcpy(dst_data_pointer, src_data_pointer, src_yuv_config->uv_width); 996 dst_data_pointer += dst_yuv_config->uv_stride; 997 src_data_pointer += src_yuv_config->uv_stride; 998 } 999 1000 // V's 1001 src_data_pointer = src_yuv_config->v_buffer; 1002 dst_data_pointer = (unsigned char *)dst_yuv_config->v_buffer + (row_offset * dst_yuv_config->uv_stride) + col_offset; 1003 1004 for (i = 0; i < src_yuv_config->uv_height; i++) 1005 { 1006 duck_memcpy(dst_data_pointer, src_data_pointer, src_yuv_config->uv_width); 1007 dst_data_pointer += dst_yuv_config->uv_stride; 1008 src_data_pointer += src_yuv_config->uv_stride; 1009 } 1010 } 1011 1012 /**************************************************************************** 1013 * 1014 * ROUTINE : scale_or_center 1015 * 1016 * INPUTS : SCALE_INSTANCE *si : Pointer to post-processor instance. 1017 * 1018 * 1019 * 1020 * OUTPUTS : None. 1021 * 1022 * RETURNS : void 1023 * 1024 * FUNCTION : Decides to scale or center image in scale buffer for blit 1025 * 1026 * SPECIAL NOTES : None. 1027 * 1028 ****************************************************************************/ 1029 void 1030 vp8_yv12_scale_or_center 1031 ( 1032 YV12_BUFFER_CONFIG *src_yuv_config, 1033 YV12_BUFFER_CONFIG *dst_yuv_config, 1034 int expanded_frame_width, 1035 int expanded_frame_height, 1036 int scaling_mode, 1037 int HScale, 1038 int HRatio, 1039 int VScale, 1040 int VRatio 1041 ) 1042 { 1043 // if ( ppi->post_processing_level ) 1044 // update_umvborder ( ppi, frame_buffer ); 1045 1046 1047 switch (scaling_mode) 1048 { 1049 case SCALE_TO_FIT: 1050 case MAINTAIN_ASPECT_RATIO: 1051 { 1052 SCALE_VARS scale_vars; 1053 // center values 1054 #if 1 1055 int row = (dst_yuv_config->y_height - expanded_frame_height) / 2; 1056 int col = (dst_yuv_config->y_width - expanded_frame_width) / 2; 1057 // int YOffset = row * dst_yuv_config->y_width + col; 1058 // int UVOffset = (row>>1) * dst_yuv_config->uv_width + (col>>1); 1059 int YOffset = row * dst_yuv_config->y_stride + col; 1060 int UVOffset = (row >> 1) * dst_yuv_config->uv_stride + (col >> 1); 1061 #else 1062 int row = (src_yuv_config->y_height - expanded_frame_height) / 2; 1063 int col = (src_yuv_config->y_width - expanded_frame_width) / 2; 1064 int YOffset = row * src_yuv_config->y_width + col; 1065 int UVOffset = (row >> 1) * src_yuv_config->uv_width + (col >> 1); 1066 #endif 1067 1068 scale_vars.dst_yuv_config = dst_yuv_config; 1069 scale_vars.src_yuv_config = src_yuv_config; 1070 scale_vars.HScale = HScale; 1071 scale_vars.HRatio = HRatio; 1072 scale_vars.VScale = VScale; 1073 scale_vars.VRatio = VRatio; 1074 scale_vars.expanded_frame_width = expanded_frame_width; 1075 scale_vars.expanded_frame_height = expanded_frame_height; 1076 1077 // perform center and scale 1078 any_ratio_frame_scale(&scale_vars, YOffset, UVOffset); 1079 1080 break; 1081 } 1082 case CENTER: 1083 center_image(src_yuv_config, dst_yuv_config); 1084 break; 1085 1086 default: 1087 break; 1088 } 1089 } 1090
