src/gallium/auxiliary/util/u_format.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2010 VMware, Inc.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 /**
  29  * @file
  30  * Pixel format accessor functions.
  31  *
  32  * @author Jose Fonseca <jfonseca@vmware.com>
  33  */
  34
  35 #include "u_math.h"
  36 #include "u_memory.h"
  37 #include "u_format.h"
  38 #include "u_format_s3tc.h"
  39 #include "u_surface.h"
  40
  41 #include "pipe/p_defines.h"
  42
  43
  44 boolean
  45 util_format_is_float(enum pipe_format format)
  46 {
  47    const struct util_format_description *desc = util_format_description(format);
  48    unsigned i;
  49
  50    assert(desc);
  51    if (!desc) {
  52       return FALSE;
  53    }
  54
  55    i = util_format_get_first_non_void_channel(format);
  56    if (i == -1) {
  57       return FALSE;
  58    }
  59
  60    return desc->channel[i].type == UTIL_FORMAT_TYPE_FLOAT ? TRUE : FALSE;
  61 }
  62
  63
  64 /** Test if the format contains RGB, but not alpha */
  65 boolean
  66 util_format_has_alpha(enum pipe_format format)
  67 {
  68    const struct util_format_description *desc =
  69       util_format_description(format);
  70
  71    return (desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||
  72            desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) &&
  73           desc->swizzle[3] != UTIL_FORMAT_SWIZZLE_1;
  74 }
  75
  76
  77 boolean
  78 util_format_is_luminance(enum pipe_format format)
  79 {
  80    const struct util_format_description *desc =
  81       util_format_description(format);
  82
  83    if ((desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||
  84         desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) &&
  85        desc->swizzle[0] == UTIL_FORMAT_SWIZZLE_X &&
  86        desc->swizzle[1] == UTIL_FORMAT_SWIZZLE_X &&
  87        desc->swizzle[2] == UTIL_FORMAT_SWIZZLE_X &&
  88        desc->swizzle[3] == UTIL_FORMAT_SWIZZLE_1) {
  89       return TRUE;
  90    }
  91    return FALSE;
  92 }
  93
  94 boolean
  95 util_format_is_alpha(enum pipe_format format)
  96 {
  97    const struct util_format_description *desc =
  98       util_format_description(format);
  99
 100    if ((desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||
 101         desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) &&
 102        desc->swizzle[0] == UTIL_FORMAT_SWIZZLE_0 &&
 103        desc->swizzle[1] == UTIL_FORMAT_SWIZZLE_0 &&
 104        desc->swizzle[2] == UTIL_FORMAT_SWIZZLE_0 &&
 105        desc->swizzle[3] == UTIL_FORMAT_SWIZZLE_X) {
 106       return TRUE;
 107    }
 108    return FALSE;
 109 }
 110
 111 boolean
 112 util_format_is_pure_integer(enum pipe_format format)
 113 {
 114    const struct util_format_description *desc = util_format_description(format);
 115    int i;
 116
 117    /* Find the first non-void channel. */
 118    i = util_format_get_first_non_void_channel(format);
 119    if (i == -1)
 120       return FALSE;
 121
 122    return desc->channel[i].pure_integer ? TRUE : FALSE;
 123 }
 124
 125 boolean
 126 util_format_is_pure_sint(enum pipe_format format)
 127 {
 128    const struct util_format_description *desc = util_format_description(format);
 129    int i;
 130
 131    i = util_format_get_first_non_void_channel(format);
 132    if (i == -1)
 133       return FALSE;
 134
 135    return (desc->channel[i].type == UTIL_FORMAT_TYPE_SIGNED && desc->channel[i].pure_integer) ? TRUE : FALSE;
 136 }
 137
 138 boolean
 139 util_format_is_pure_uint(enum pipe_format format)
 140 {
 141    const struct util_format_description *desc = util_format_description(format);
 142    int i;
 143
 144    i = util_format_get_first_non_void_channel(format);
 145    if (i == -1)
 146       return FALSE;
 147
 148    return (desc->channel[i].type == UTIL_FORMAT_TYPE_UNSIGNED && desc->channel[i].pure_integer) ? TRUE : FALSE;
 149 }
 150
 151 /**
 152  * Returns true if all non-void channels are normalized signed.
 153  */
 154 boolean
 155 util_format_is_snorm(enum pipe_format format)
 156 {
 157    const struct util_format_description *desc = util_format_description(format);
 158    int i;
 159
 160    if (desc->is_mixed)
 161       return FALSE;
 162
 163    i = util_format_get_first_non_void_channel(format);
 164    if (i == -1)
 165       return FALSE;
 166
 167    return desc->channel[i].type == UTIL_FORMAT_TYPE_SIGNED &&
 168           !desc->channel[i].pure_integer &&
 169           desc->channel[i].normalized;
 170 }
 171
 172 boolean
 173 util_format_is_luminance_alpha(enum pipe_format format)
 174 {
 175    const struct util_format_description *desc =
 176       util_format_description(format);
 177
 178    if ((desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||
 179         desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) &&
 180        desc->swizzle[0] == UTIL_FORMAT_SWIZZLE_X &&
 181        desc->swizzle[1] == UTIL_FORMAT_SWIZZLE_X &&
 182        desc->swizzle[2] == UTIL_FORMAT_SWIZZLE_X &&
 183        desc->swizzle[3] == UTIL_FORMAT_SWIZZLE_Y) {
 184       return TRUE;
 185    }
 186    return FALSE;
 187 }
 188
 189
 190 boolean
 191 util_format_is_intensity(enum pipe_format format)
 192 {
 193    const struct util_format_description *desc =
 194       util_format_description(format);
 195
 196    if ((desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||
 197         desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) &&
 198        desc->swizzle[0] == UTIL_FORMAT_SWIZZLE_X &&
 199        desc->swizzle[1] == UTIL_FORMAT_SWIZZLE_X &&
 200        desc->swizzle[2] == UTIL_FORMAT_SWIZZLE_X &&
 201        desc->swizzle[3] == UTIL_FORMAT_SWIZZLE_X) {
 202       return TRUE;
 203    }
 204    return FALSE;
 205 }
 206
 207 boolean
 208 util_format_is_subsampled_422(enum pipe_format format)
 209 {
 210    const struct util_format_description *desc =
 211       util_format_description(format);
 212
 213    return desc->layout == UTIL_FORMAT_LAYOUT_SUBSAMPLED &&
 214       desc->block.width == 2 &&
 215       desc->block.height == 1 &&
 216       desc->block.bits == 32;
 217 }
 218
 219 boolean
 220 util_format_is_supported(enum pipe_format format, unsigned bind)
 221 {
 222    if (util_format_is_s3tc(format) && !util_format_s3tc_enabled) {
 223       return FALSE;
 224    }
 225
 226 #ifndef TEXTURE_FLOAT_ENABLED
 227    if ((bind & PIPE_BIND_RENDER_TARGET) &&
 228        format != PIPE_FORMAT_R9G9B9E5_FLOAT &&
 229        format != PIPE_FORMAT_R11G11B10_FLOAT &&
 230        util_format_is_float(format)) {
 231       return FALSE;
 232    }
 233 #endif
 234
 235    return TRUE;
 236 }
 237
 238
 239 /**
 240  * Calculates the MRD for the depth format. MRD is used in depth bias
 241  * for UNORM and unbound depth buffers. When the depth buffer is floating
 242  * point, the depth bias calculation does not use the MRD. However, the
 243  * default MRD will be 1.0 / ((1 << 24) - 1).
 244  */
 245 double
 246 util_get_depth_format_mrd(const struct util_format_description *desc)
 247 {
 248    /*
 249     * Depth buffer formats without a depth component OR scenarios
 250     * without a bound depth buffer default to D24.
 251     */
 252    double mrd = 1.0 / ((1 << 24) - 1);
 253    unsigned depth_channel;
 254
 255    assert(desc);
 256
 257    /*
 258     * Some depth formats do not store the depth component in the first
 259     * channel, detect the format and adjust the depth channel. Get the
 260     * swizzled depth component channel.
 261     */
 262    depth_channel = desc->swizzle[0];
 263
 264    if (desc->channel[depth_channel].type == UTIL_FORMAT_TYPE_UNSIGNED &&
 265        desc->channel[depth_channel].normalized) {
 266       int depth_bits;
 267
 268       depth_bits = desc->channel[depth_channel].size;
 269       mrd = 1.0 / ((1ULL << depth_bits) - 1);
 270    }
 271
 272    return mrd;
 273 }
 274
 275
 276 void
 277 util_format_read_4f(enum pipe_format format,
 278                     float *dst, unsigned dst_stride,
 279                     const void *src, unsigned src_stride,
 280                     unsigned x, unsigned y, unsigned w, unsigned h)
 281 {
 282    const struct util_format_description *format_desc;
 283    const uint8_t *src_row;
 284    float *dst_row;
 285
 286    format_desc = util_format_description(format);
 287
 288    assert(x % format_desc->block.width == 0);
 289    assert(y % format_desc->block.height == 0);
 290
 291    src_row = (const uint8_t *)src + y*src_stride + x*(format_desc->block.bits/8);
 292    dst_row = dst;
 293
 294    format_desc->unpack_rgba_float(dst_row, dst_stride, src_row, src_stride, w, h);
 295 }
 296
 297
 298 void
 299 util_format_write_4f(enum pipe_format format,
 300                      const float *src, unsigned src_stride,
 301                      void *dst, unsigned dst_stride,
 302                      unsigned x, unsigned y, unsigned w, unsigned h)
 303 {
 304    const struct util_format_description *format_desc;
 305    uint8_t *dst_row;
 306    const float *src_row;
 307
 308    format_desc = util_format_description(format);
 309
 310    assert(x % format_desc->block.width == 0);
 311    assert(y % format_desc->block.height == 0);
 312
 313    dst_row = (uint8_t *)dst + y*dst_stride + x*(format_desc->block.bits/8);
 314    src_row = src;
 315
 316    format_desc->pack_rgba_float(dst_row, dst_stride, src_row, src_stride, w, h);
 317 }
 318
 319
 320 void
 321 util_format_read_4ub(enum pipe_format format, uint8_t *dst, unsigned dst_stride, const void *src, unsigned src_stride, unsigned x, unsigned y, unsigned w, unsigned h)
 322 {
 323    const struct util_format_description *format_desc;
 324    const uint8_t *src_row;
 325    uint8_t *dst_row;
 326
 327    format_desc = util_format_description(format);
 328
 329    assert(x % format_desc->block.width == 0);
 330    assert(y % format_desc->block.height == 0);
 331
 332    src_row = (const uint8_t *)src + y*src_stride + x*(format_desc->block.bits/8);
 333    dst_row = dst;
 334
 335    format_desc->unpack_rgba_8unorm(dst_row, dst_stride, src_row, src_stride, w, h);
 336 }
 337
 338
 339 void
 340 util_format_write_4ub(enum pipe_format format, const uint8_t *src, unsigned src_stride, void *dst, unsigned dst_stride, unsigned x, unsigned y, unsigned w, unsigned h)
 341 {
 342    const struct util_format_description *format_desc;
 343    uint8_t *dst_row;
 344    const uint8_t *src_row;
 345
 346    format_desc = util_format_description(format);
 347
 348    assert(x % format_desc->block.width == 0);
 349    assert(y % format_desc->block.height == 0);
 350
 351    dst_row = (uint8_t *)dst + y*dst_stride + x*(format_desc->block.bits/8);
 352    src_row = src;
 353
 354    format_desc->pack_rgba_8unorm(dst_row, dst_stride, src_row, src_stride, w, h);
 355 }
 356
 357 void
 358 util_format_read_4ui(enum pipe_format format,
 359                      unsigned *dst, unsigned dst_stride,
 360                      const void *src, unsigned src_stride,
 361                      unsigned x, unsigned y, unsigned w, unsigned h)
 362 {
 363    const struct util_format_description *format_desc;
 364    const uint8_t *src_row;
 365    uint32_t *dst_row;
 366
 367    format_desc = util_format_description(format);
 368
 369    assert(x % format_desc->block.width == 0);
 370    assert(y % format_desc->block.height == 0);
 371
 372    src_row = (const uint8_t *)src + y*src_stride + x*(format_desc->block.bits/8);
 373    dst_row = dst;
 374
 375    format_desc->unpack_rgba_uint(dst_row, dst_stride, src_row, src_stride, w, h);
 376 }
 377
 378 void
 379 util_format_write_4ui(enum pipe_format format,
 380                       const unsigned int *src, unsigned src_stride,
 381                       void *dst, unsigned dst_stride,
 382                       unsigned x, unsigned y, unsigned w, unsigned h)
 383 {
 384    const struct util_format_description *format_desc;
 385    uint8_t *dst_row;
 386    const uint32_t *src_row;
 387
 388    format_desc = util_format_description(format);
 389
 390    assert(x % format_desc->block.width == 0);
 391    assert(y % format_desc->block.height == 0);
 392
 393    dst_row = (uint8_t *)dst + y*dst_stride + x*(format_desc->block.bits/8);
 394    src_row = src;
 395
 396    format_desc->pack_rgba_uint(dst_row, dst_stride, src_row, src_stride, w, h);
 397 }
 398
 399 void
 400 util_format_read_4i(enum pipe_format format,
 401                     int *dst, unsigned dst_stride,
 402                     const void *src, unsigned src_stride,
 403                     unsigned x, unsigned y, unsigned w, unsigned h)
 404 {
 405    const struct util_format_description *format_desc;
 406    const uint8_t *src_row;
 407    int32_t *dst_row;
 408
 409    format_desc = util_format_description(format);
 410
 411    assert(x % format_desc->block.width == 0);
 412    assert(y % format_desc->block.height == 0);
 413
 414    src_row = (const uint8_t *)src + y*src_stride + x*(format_desc->block.bits/8);
 415    dst_row = dst;
 416
 417    format_desc->unpack_rgba_sint(dst_row, dst_stride, src_row, src_stride, w, h);
 418 }
 419
 420 void
 421 util_format_write_4i(enum pipe_format format,
 422                       const int *src, unsigned src_stride,
 423                       void *dst, unsigned dst_stride,
 424                       unsigned x, unsigned y, unsigned w, unsigned h)
 425 {
 426    const struct util_format_description *format_desc;
 427    uint8_t *dst_row;
 428    const int32_t *src_row;
 429
 430    format_desc = util_format_description(format);
 431
 432    assert(x % format_desc->block.width == 0);
 433    assert(y % format_desc->block.height == 0);
 434
 435    dst_row = (uint8_t *)dst + y*dst_stride + x*(format_desc->block.bits/8);
 436    src_row = src;
 437
 438    format_desc->pack_rgba_sint(dst_row, dst_stride, src_row, src_stride, w, h);
 439 }
 440
 441 boolean
 442 util_is_format_compatible(const struct util_format_description *src_desc,
 443                           const struct util_format_description *dst_desc)
 444 {
 445    unsigned chan;
 446
 447    if (src_desc->format == dst_desc->format) {
 448       return TRUE;
 449    }
 450
 451    if (src_desc->layout != UTIL_FORMAT_LAYOUT_PLAIN ||
 452        dst_desc->layout != UTIL_FORMAT_LAYOUT_PLAIN) {
 453       return FALSE;
 454    }
 455
 456    if (src_desc->block.bits != dst_desc->block.bits ||
 457        src_desc->nr_channels != dst_desc->nr_channels ||
 458        src_desc->colorspace != dst_desc->colorspace) {
 459       return FALSE;
 460    }
 461
 462    for (chan = 0; chan < 4; ++chan) {
 463       if (src_desc->channel[chan].size !=
 464           dst_desc->channel[chan].size) {
 465          return FALSE;
 466       }
 467    }
 468
 469    for (chan = 0; chan < 4; ++chan) {
 470       enum util_format_swizzle swizzle = dst_desc->swizzle[chan];
 471
 472       if (swizzle < 4) {
 473          if (src_desc->swizzle[chan] != swizzle) {
 474             return FALSE;
 475          }
 476          if ((src_desc->channel[swizzle].type !=
 477               dst_desc->channel[swizzle].type) ||
 478              (src_desc->channel[swizzle].normalized !=
 479               dst_desc->channel[swizzle].normalized)) {
 480             return FALSE;
 481          }
 482       }
 483    }
 484
 485    return TRUE;
 486 }
 487
 488
 489 boolean
 490 util_format_fits_8unorm(const struct util_format_description *format_desc)
 491 {
 492    unsigned chan;
 493
 494    /*
 495     * After linearized sRGB values require more than 8bits.
 496     */
 497
 498    if (format_desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) {
 499       return FALSE;
 500    }
 501
 502    switch (format_desc->layout) {
 503
 504    case UTIL_FORMAT_LAYOUT_S3TC:
 505       /*
 506        * These are straight forward.
 507        */
 508       return TRUE;
 509    case UTIL_FORMAT_LAYOUT_RGTC:
 510       if (format_desc->format == PIPE_FORMAT_RGTC1_SNORM ||
 511           format_desc->format == PIPE_FORMAT_RGTC2_SNORM ||
 512           format_desc->format == PIPE_FORMAT_LATC1_SNORM ||
 513           format_desc->format == PIPE_FORMAT_LATC2_SNORM)
 514          return FALSE;
 515       return TRUE;
 516    case UTIL_FORMAT_LAYOUT_BPTC:
 517       if (format_desc->format == PIPE_FORMAT_BPTC_RGBA_UNORM)
 518          return TRUE;
 519       return FALSE;
 520
 521    case UTIL_FORMAT_LAYOUT_PLAIN:
 522       /*
 523        * For these we can find a generic rule.
 524        */
 525
 526       for (chan = 0; chan < format_desc->nr_channels; ++chan) {
 527          switch (format_desc->channel[chan].type) {
 528          case UTIL_FORMAT_TYPE_VOID:
 529             break;
 530          case UTIL_FORMAT_TYPE_UNSIGNED:
 531             if (!format_desc->channel[chan].normalized ||
 532                 format_desc->channel[chan].size > 8) {
 533                return FALSE;
 534             }
 535             break;
 536          default:
 537             return FALSE;
 538          }
 539       }
 540       return TRUE;
 541
 542    default:
 543       /*
 544        * Handle all others on a case by case basis.
 545        */
 546
 547       switch (format_desc->format) {
 548       case PIPE_FORMAT_R1_UNORM:
 549       case PIPE_FORMAT_UYVY:
 550       case PIPE_FORMAT_YUYV:
 551       case PIPE_FORMAT_R8G8_B8G8_UNORM:
 552       case PIPE_FORMAT_G8R8_G8B8_UNORM:
 553          return TRUE;
 554
 555       default:
 556          return FALSE;
 557       }
 558    }
 559 }
 560
 561
 562 boolean
 563 util_format_translate(enum pipe_format dst_format,
 564                       void *dst, unsigned dst_stride,
 565                       unsigned dst_x, unsigned dst_y,
 566                       enum pipe_format src_format,
 567                       const void *src, unsigned src_stride,
 568                       unsigned src_x, unsigned src_y,
 569                       unsigned width, unsigned height)
 570 {
 571    const struct util_format_description *dst_format_desc;
 572    const struct util_format_description *src_format_desc;
 573    uint8_t *dst_row;
 574    const uint8_t *src_row;
 575    unsigned x_step, y_step;
 576    unsigned dst_step;
 577    unsigned src_step;
 578
 579    dst_format_desc = util_format_description(dst_format);
 580    src_format_desc = util_format_description(src_format);
 581
 582    if (util_is_format_compatible(src_format_desc, dst_format_desc)) {
 583       /*
 584        * Trivial case.
 585        */
 586
 587       util_copy_rect(dst, dst_format, dst_stride,  dst_x, dst_y,
 588                      width, height, src, (int)src_stride,
 589                      src_x, src_y);
 590       return TRUE;
 591    }
 592
 593    assert(dst_x % dst_format_desc->block.width == 0);
 594    assert(dst_y % dst_format_desc->block.height == 0);
 595    assert(src_x % src_format_desc->block.width == 0);
 596    assert(src_y % src_format_desc->block.height == 0);
 597
 598    dst_row = (uint8_t *)dst + dst_y*dst_stride + dst_x*(dst_format_desc->block.bits/8);
 599    src_row = (const uint8_t *)src + src_y*src_stride + src_x*(src_format_desc->block.bits/8);
 600
 601    /*
 602     * This works because all pixel formats have pixel blocks with power of two
 603     * sizes.
 604     */
 605
 606    y_step = MAX2(dst_format_desc->block.height, src_format_desc->block.height);
 607    x_step = MAX2(dst_format_desc->block.width, src_format_desc->block.width);
 608    assert(y_step % dst_format_desc->block.height == 0);
 609    assert(y_step % src_format_desc->block.height == 0);
 610
 611    dst_step = y_step / dst_format_desc->block.height * dst_stride;
 612    src_step = y_step / src_format_desc->block.height * src_stride;
 613
 614    /*
 615     * TODO: double formats will loose precision
 616     * TODO: Add a special case for formats that are mere swizzles of each other
 617     */
 618
 619    if (src_format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS ||
 620        dst_format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS) {
 621       float *tmp_z = NULL;
 622       uint8_t *tmp_s = NULL;
 623
 624       assert(x_step == 1);
 625       assert(y_step == 1);
 626
 627       if (src_format_desc->unpack_z_float &&
 628           dst_format_desc->pack_z_float) {
 629          tmp_z = MALLOC(width * sizeof *tmp_z);
 630       }
 631
 632       if (src_format_desc->unpack_s_8uint &&
 633           dst_format_desc->pack_s_8uint) {
 634          tmp_s = MALLOC(width * sizeof *tmp_s);
 635       }
 636
 637       while (height--) {
 638          if (tmp_z) {
 639             src_format_desc->unpack_z_float(tmp_z, 0, src_row, src_stride, width, 1);
 640             dst_format_desc->pack_z_float(dst_row, dst_stride, tmp_z, 0, width, 1);
 641          }
 642
 643          if (tmp_s) {
 644             src_format_desc->unpack_s_8uint(tmp_s, 0, src_row, src_stride, width, 1);
 645             dst_format_desc->pack_s_8uint(dst_row, dst_stride, tmp_s, 0, width, 1);
 646          }
 647
 648          dst_row += dst_step;
 649          src_row += src_step;
 650       }
 651
 652       FREE(tmp_s);
 653
 654       FREE(tmp_z);
 655
 656       return TRUE;
 657    }
 658
 659    if (util_format_fits_8unorm(src_format_desc) ||
 660        util_format_fits_8unorm(dst_format_desc)) {
 661       unsigned tmp_stride;
 662       uint8_t *tmp_row;
 663
 664       if (!src_format_desc->unpack_rgba_8unorm ||
 665           !dst_format_desc->pack_rgba_8unorm) {
 666          return FALSE;
 667       }
 668
 669       tmp_stride = MAX2(width, x_step) * 4 * sizeof *tmp_row;
 670       tmp_row = MALLOC(y_step * tmp_stride);
 671       if (!tmp_row)
 672          return FALSE;
 673
 674       while (height >= y_step) {
 675          src_format_desc->unpack_rgba_8unorm(tmp_row, tmp_stride, src_row, src_stride, width, y_step);
 676          dst_format_desc->pack_rgba_8unorm(dst_row, dst_stride, tmp_row, tmp_stride, width, y_step);
 677
 678          dst_row += dst_step;
 679          src_row += src_step;
 680          height -= y_step;
 681       }
 682
 683       if (height) {
 684          src_format_desc->unpack_rgba_8unorm(tmp_row, tmp_stride, src_row, src_stride, width, height);
 685          dst_format_desc->pack_rgba_8unorm(dst_row, dst_stride, tmp_row, tmp_stride, width, height);
 686       }
 687
 688       FREE(tmp_row);
 689    }
 690    else {
 691       unsigned tmp_stride;
 692       float *tmp_row;
 693
 694       if (!src_format_desc->unpack_rgba_float ||
 695           !dst_format_desc->pack_rgba_float) {
 696          return FALSE;
 697       }
 698
 699       tmp_stride = MAX2(width, x_step) * 4 * sizeof *tmp_row;
 700       tmp_row = MALLOC(y_step * tmp_stride);
 701       if (!tmp_row)
 702          return FALSE;
 703
 704       while (height >= y_step) {
 705          src_format_desc->unpack_rgba_float(tmp_row, tmp_stride, src_row, src_stride, width, y_step);
 706          dst_format_desc->pack_rgba_float(dst_row, dst_stride, tmp_row, tmp_stride, width, y_step);
 707
 708          dst_row += dst_step;
 709          src_row += src_step;
 710          height -= y_step;
 711       }
 712
 713       if (height) {
 714          src_format_desc->unpack_rgba_float(tmp_row, tmp_stride, src_row, src_stride, width, height);
 715          dst_format_desc->pack_rgba_float(dst_row, dst_stride, tmp_row, tmp_stride, width, height);
 716       }
 717
 718       FREE(tmp_row);
 719    }
 720    return TRUE;
 721 }
 722
 723 void util_format_compose_swizzles(const unsigned char swz1[4],
 724                                   const unsigned char swz2[4],
 725                                   unsigned char dst[4])
 726 {
 727    unsigned i;
 728
 729    for (i = 0; i < 4; i++) {
 730       dst[i] = swz2[i] <= UTIL_FORMAT_SWIZZLE_W ?
 731                swz1[swz2[i]] : swz2[i];
 732    }
 733 }
 734
 735 void util_format_apply_color_swizzle(union pipe_color_union *dst,
 736                                      const union pipe_color_union *src,
 737                                      const unsigned char swz[4],
 738                                      const boolean is_integer)
 739 {
 740    unsigned c;
 741
 742    if (is_integer) {
 743       for (c = 0; c < 4; ++c) {
 744          switch (swz[c]) {
 745          case PIPE_SWIZZLE_RED:   dst->ui[c] = src->ui[0]; break;
 746          case PIPE_SWIZZLE_GREEN: dst->ui[c] = src->ui[1]; break;
 747          case PIPE_SWIZZLE_BLUE:  dst->ui[c] = src->ui[2]; break;
 748          case PIPE_SWIZZLE_ALPHA: dst->ui[c] = src->ui[3]; break;
 749          default:
 750             dst->ui[c] = (swz[c] == PIPE_SWIZZLE_ONE) ? 1 : 0;
 751             break;
 752          }
 753       }
 754    } else {
 755       for (c = 0; c < 4; ++c) {
 756          switch (swz[c]) {
 757          case PIPE_SWIZZLE_RED:   dst->f[c] = src->f[0]; break;
 758          case PIPE_SWIZZLE_GREEN: dst->f[c] = src->f[1]; break;
 759          case PIPE_SWIZZLE_BLUE:  dst->f[c] = src->f[2]; break;
 760          case PIPE_SWIZZLE_ALPHA: dst->f[c] = src->f[3]; break;
 761          default:
 762             dst->f[c] = (swz[c] == PIPE_SWIZZLE_ONE) ? 1.0f : 0.0f;
 763             break;
 764          }
 765       }
 766    }
 767 }
 768
 769 void util_format_swizzle_4f(float *dst, const float *src,
 770                             const unsigned char swz[4])
 771 {
 772    unsigned i;
 773
 774    for (i = 0; i < 4; i++) {
 775       if (swz[i] <= UTIL_FORMAT_SWIZZLE_W)
 776          dst[i] = src[swz[i]];
 777       else if (swz[i] == UTIL_FORMAT_SWIZZLE_0)
 778          dst[i] = 0;
 779       else if (swz[i] == UTIL_FORMAT_SWIZZLE_1)
 780          dst[i] = 1;
 781    }
 782 }
 783
 784 void util_format_unswizzle_4f(float *dst, const float *src,
 785                               const unsigned char swz[4])
 786 {
 787    unsigned i;
 788
 789    for (i = 0; i < 4; i++) {
 790       switch (swz[i]) {
 791       case UTIL_FORMAT_SWIZZLE_X:
 792          dst[0] = src[i];
 793          break;
 794       case UTIL_FORMAT_SWIZZLE_Y:
 795          dst[1] = src[i];
 796          break;
 797       case UTIL_FORMAT_SWIZZLE_Z:
 798          dst[2] = src[i];
 799          break;
 800       case UTIL_FORMAT_SWIZZLE_W:
 801          dst[3] = src[i];
 802          break;
 803       }
 804    }
 805 }