vpx_scale/generic/vpxscale.c

   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 }