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_pure_integer(enum pipe_format format)
  96 {
  97    const struct util_format_description *desc = util_format_description(format);
  98    int i;
  99
 100    /* Find the first non-void channel. */
 101    i = util_format_get_first_non_void_channel(format);
 102    if (i == -1)
 103       return FALSE;
 104
 105    return desc->channel[i].pure_integer ? TRUE : FALSE;
 106 }
 107
 108 boolean
 109 util_format_is_pure_sint(enum pipe_format format)
 110 {
 111    const struct util_format_description *desc = util_format_description(format);
 112    int i;
 113
 114    i = util_format_get_first_non_void_channel(format);
 115    if (i == -1)
 116       return FALSE;
 117
 118    return (desc->channel[i].type == UTIL_FORMAT_TYPE_SIGNED && desc->channel[i].pure_integer) ? TRUE : FALSE;
 119 }
 120
 121 boolean
 122 util_format_is_pure_uint(enum pipe_format format)
 123 {
 124    const struct util_format_description *desc = util_format_description(format);
 125    int i;
 126
 127    i = util_format_get_first_non_void_channel(format);
 128    if (i == -1)
 129       return FALSE;
 130
 131    return (desc->channel[i].type == UTIL_FORMAT_TYPE_UNSIGNED && desc->channel[i].pure_integer) ? TRUE : FALSE;
 132 }
 133
 134 /**
 135  * Returns true if all non-void channels are normalized signed.
 136  */
 137 boolean
 138 util_format_is_snorm(enum pipe_format format)
 139 {
 140    const struct util_format_description *desc = util_format_description(format);
 141    int i;
 142
 143    if (desc->is_mixed)
 144       return FALSE;
 145
 146    i = util_format_get_first_non_void_channel(format);
 147    if (i == -1)
 148       return FALSE;
 149
 150    return desc->channel[i].type == UTIL_FORMAT_TYPE_SIGNED &&
 151           !desc->channel[i].pure_integer &&
 152           desc->channel[i].normalized;
 153 }
 154
 155 boolean
 156 util_format_is_luminance_alpha(enum pipe_format format)
 157 {
 158    const struct util_format_description *desc =
 159       util_format_description(format);
 160
 161    if ((desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||
 162         desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) &&
 163        desc->swizzle[0] == UTIL_FORMAT_SWIZZLE_X &&
 164        desc->swizzle[1] == UTIL_FORMAT_SWIZZLE_X &&
 165        desc->swizzle[2] == UTIL_FORMAT_SWIZZLE_X &&
 166        desc->swizzle[3] == UTIL_FORMAT_SWIZZLE_Y) {
 167       return TRUE;
 168    }
 169    return FALSE;
 170 }
 171
 172
 173 boolean
 174 util_format_is_intensity(enum pipe_format format)
 175 {
 176    const struct util_format_description *desc =
 177       util_format_description(format);
 178
 179    if ((desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||
 180         desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) &&
 181        desc->swizzle[0] == UTIL_FORMAT_SWIZZLE_X &&
 182        desc->swizzle[1] == UTIL_FORMAT_SWIZZLE_X &&
 183        desc->swizzle[2] == UTIL_FORMAT_SWIZZLE_X &&
 184        desc->swizzle[3] == UTIL_FORMAT_SWIZZLE_X) {
 185       return TRUE;
 186    }
 187    return FALSE;
 188 }
 189
 190
 191 boolean
 192 util_format_is_supported(enum pipe_format format, unsigned bind)
 193 {
 194    if (util_format_is_s3tc(format) && !util_format_s3tc_enabled) {
 195       return FALSE;
 196    }
 197
 198 #ifndef TEXTURE_FLOAT_ENABLED
 199    if ((bind & PIPE_BIND_RENDER_TARGET) &&
 200        format != PIPE_FORMAT_R9G9B9E5_FLOAT &&
 201        format != PIPE_FORMAT_R11G11B10_FLOAT &&
 202        util_format_is_float(format)) {
 203       return FALSE;
 204    }
 205 #endif
 206
 207    return TRUE;
 208 }
 209
 210
 211 /**
 212  * Calculates the MRD for the depth format. MRD is used in depth bias
 213  * for UNORM and unbound depth buffers. When the depth buffer is floating
 214  * point, the depth bias calculation does not use the MRD. However, the
 215  * default MRD will be 1.0 / ((1 << 24) - 1).
 216  */
 217 double
 218 util_get_depth_format_mrd(const struct util_format_description *desc)
 219 {
 220    /*
 221     * Depth buffer formats without a depth component OR scenarios
 222     * without a bound depth buffer default to D24.
 223     */
 224    double mrd = 1.0 / ((1 << 24) - 1);
 225    unsigned depth_channel;
 226
 227    assert(desc);
 228
 229    /*
 230     * Some depth formats do not store the depth component in the first
 231     * channel, detect the format and adjust the depth channel. Get the
 232     * swizzled depth component channel.
 233     */
 234    depth_channel = desc->swizzle[0];
 235
 236    if (desc->channel[depth_channel].type == UTIL_FORMAT_TYPE_UNSIGNED &&
 237        desc->channel[depth_channel].normalized) {
 238       int depth_bits;
 239
 240       depth_bits = desc->channel[depth_channel].size;
 241       mrd = 1.0 / ((1ULL << depth_bits) - 1);
 242    }
 243
 244    return mrd;
 245 }
 246
 247
 248 void
 249 util_format_read_4f(enum pipe_format format,
 250                     float *dst, unsigned dst_stride,
 251                     const void *src, unsigned src_stride,
 252                     unsigned x, unsigned y, unsigned w, unsigned h)
 253 {
 254    const struct util_format_description *format_desc;
 255    const uint8_t *src_row;
 256    float *dst_row;
 257
 258    format_desc = util_format_description(format);
 259
 260    assert(x % format_desc->block.width == 0);
 261    assert(y % format_desc->block.height == 0);
 262
 263    src_row = (const uint8_t *)src + y*src_stride + x*(format_desc->block.bits/8);
 264    dst_row = dst;
 265
 266    format_desc->unpack_rgba_float(dst_row, dst_stride, src_row, src_stride, w, h);
 267 }
 268
 269
 270 void
 271 util_format_write_4f(enum pipe_format format,
 272                      const float *src, unsigned src_stride,
 273                      void *dst, unsigned dst_stride,
 274                      unsigned x, unsigned y, unsigned w, unsigned h)
 275 {
 276    const struct util_format_description *format_desc;
 277    uint8_t *dst_row;
 278    const float *src_row;
 279
 280    format_desc = util_format_description(format);
 281
 282    assert(x % format_desc->block.width == 0);
 283    assert(y % format_desc->block.height == 0);
 284
 285    dst_row = (uint8_t *)dst + y*dst_stride + x*(format_desc->block.bits/8);
 286    src_row = src;
 287
 288    format_desc->pack_rgba_float(dst_row, dst_stride, src_row, src_stride, w, h);
 289 }
 290
 291
 292 void
 293 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)
 294 {
 295    const struct util_format_description *format_desc;
 296    const uint8_t *src_row;
 297    uint8_t *dst_row;
 298
 299    format_desc = util_format_description(format);
 300
 301    assert(x % format_desc->block.width == 0);
 302    assert(y % format_desc->block.height == 0);
 303
 304    src_row = (const uint8_t *)src + y*src_stride + x*(format_desc->block.bits/8);
 305    dst_row = dst;
 306
 307    format_desc->unpack_rgba_8unorm(dst_row, dst_stride, src_row, src_stride, w, h);
 308 }
 309
 310
 311 void
 312 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)
 313 {
 314    const struct util_format_description *format_desc;
 315    uint8_t *dst_row;
 316    const uint8_t *src_row;
 317
 318    format_desc = util_format_description(format);
 319
 320    assert(x % format_desc->block.width == 0);
 321    assert(y % format_desc->block.height == 0);
 322
 323    dst_row = (uint8_t *)dst + y*dst_stride + x*(format_desc->block.bits/8);
 324    src_row = src;
 325
 326    format_desc->pack_rgba_8unorm(dst_row, dst_stride, src_row, src_stride, w, h);
 327 }
 328
 329 void
 330 util_format_read_4ui(enum pipe_format format,
 331                      unsigned *dst, unsigned dst_stride,
 332                      const void *src, unsigned src_stride,
 333                      unsigned x, unsigned y, unsigned w, unsigned h)
 334 {
 335    const struct util_format_description *format_desc;
 336    const uint8_t *src_row;
 337    uint32_t *dst_row;
 338
 339    format_desc = util_format_description(format);
 340
 341    assert(x % format_desc->block.width == 0);
 342    assert(y % format_desc->block.height == 0);
 343
 344    src_row = (const uint8_t *)src + y*src_stride + x*(format_desc->block.bits/8);
 345    dst_row = dst;
 346
 347    format_desc->unpack_rgba_uint(dst_row, dst_stride, src_row, src_stride, w, h);
 348 }
 349
 350 void
 351 util_format_write_4ui(enum pipe_format format,
 352                       const unsigned int *src, unsigned src_stride,
 353                       void *dst, unsigned dst_stride,
 354                       unsigned x, unsigned y, unsigned w, unsigned h)
 355 {
 356    const struct util_format_description *format_desc;
 357    uint8_t *dst_row;
 358    const uint32_t *src_row;
 359
 360    format_desc = util_format_description(format);
 361
 362    assert(x % format_desc->block.width == 0);
 363    assert(y % format_desc->block.height == 0);
 364
 365    dst_row = (uint8_t *)dst + y*dst_stride + x*(format_desc->block.bits/8);
 366    src_row = src;
 367
 368    format_desc->pack_rgba_uint(dst_row, dst_stride, src_row, src_stride, w, h);
 369 }
 370
 371 void
 372 util_format_read_4i(enum pipe_format format,
 373                     int *dst, unsigned dst_stride,
 374                     const void *src, unsigned src_stride,
 375                     unsigned x, unsigned y, unsigned w, unsigned h)
 376 {
 377    const struct util_format_description *format_desc;
 378    const uint8_t *src_row;
 379    int32_t *dst_row;
 380
 381    format_desc = util_format_description(format);
 382
 383    assert(x % format_desc->block.width == 0);
 384    assert(y % format_desc->block.height == 0);
 385
 386    src_row = (const uint8_t *)src + y*src_stride + x*(format_desc->block.bits/8);
 387    dst_row = dst;
 388
 389    format_desc->unpack_rgba_sint(dst_row, dst_stride, src_row, src_stride, w, h);
 390 }
 391
 392 void
 393 util_format_write_4i(enum pipe_format format,
 394                       const int *src, unsigned src_stride,
 395                       void *dst, unsigned dst_stride,
 396                       unsigned x, unsigned y, unsigned w, unsigned h)
 397 {
 398    const struct util_format_description *format_desc;
 399    uint8_t *dst_row;
 400    const int32_t *src_row;
 401
 402    format_desc = util_format_description(format);
 403
 404    assert(x % format_desc->block.width == 0);
 405    assert(y % format_desc->block.height == 0);
 406
 407    dst_row = (uint8_t *)dst + y*dst_stride + x*(format_desc->block.bits/8);
 408    src_row = src;
 409
 410    format_desc->pack_rgba_sint(dst_row, dst_stride, src_row, src_stride, w, h);
 411 }
 412
 413 boolean
 414 util_is_format_compatible(const struct util_format_description *src_desc,
 415                           const struct util_format_description *dst_desc)
 416 {
 417    unsigned chan;
 418
 419    if (src_desc->format == dst_desc->format) {
 420       return TRUE;
 421    }
 422
 423    if (src_desc->layout != UTIL_FORMAT_LAYOUT_PLAIN ||
 424        dst_desc->layout != UTIL_FORMAT_LAYOUT_PLAIN) {
 425       return FALSE;
 426    }
 427
 428    if (src_desc->block.bits != dst_desc->block.bits ||
 429        src_desc->nr_channels != dst_desc->nr_channels ||
 430        src_desc->colorspace != dst_desc->colorspace) {
 431       return FALSE;
 432    }
 433
 434    for (chan = 0; chan < 4; ++chan) {
 435       if (src_desc->channel[chan].size !=
 436           dst_desc->channel[chan].size) {
 437          return FALSE;
 438       }
 439    }
 440
 441    for (chan = 0; chan < 4; ++chan) {
 442       enum util_format_swizzle swizzle = dst_desc->swizzle[chan];
 443
 444       if (swizzle < 4) {
 445          if (src_desc->swizzle[chan] != swizzle) {
 446             return FALSE;
 447          }
 448          if ((src_desc->channel[swizzle].type !=
 449               dst_desc->channel[swizzle].type) ||
 450              (src_desc->channel[swizzle].normalized !=
 451               dst_desc->channel[swizzle].normalized)) {
 452             return FALSE;
 453          }
 454       }
 455    }
 456
 457    return TRUE;
 458 }
 459
 460
 461 boolean
 462 util_format_fits_8unorm(const struct util_format_description *format_desc)
 463 {
 464    unsigned chan;
 465
 466    /*
 467     * After linearized sRGB values require more than 8bits.
 468     */
 469
 470    if (format_desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) {
 471       return FALSE;
 472    }
 473
 474    switch (format_desc->layout) {
 475
 476    case UTIL_FORMAT_LAYOUT_S3TC:
 477       /*
 478        * These are straight forward.
 479        */
 480       return TRUE;
 481    case UTIL_FORMAT_LAYOUT_RGTC:
 482       if (format_desc->format == PIPE_FORMAT_RGTC1_SNORM ||
 483           format_desc->format == PIPE_FORMAT_RGTC2_SNORM ||
 484           format_desc->format == PIPE_FORMAT_LATC1_SNORM ||
 485           format_desc->format == PIPE_FORMAT_LATC2_SNORM)
 486          return FALSE;
 487       return TRUE;
 488
 489    case UTIL_FORMAT_LAYOUT_PLAIN:
 490       /*
 491        * For these we can find a generic rule.
 492        */
 493
 494       for (chan = 0; chan < format_desc->nr_channels; ++chan) {
 495          switch (format_desc->channel[chan].type) {
 496          case UTIL_FORMAT_TYPE_VOID:
 497             break;
 498          case UTIL_FORMAT_TYPE_UNSIGNED:
 499             if (!format_desc->channel[chan].normalized ||
 500                 format_desc->channel[chan].size > 8) {
 501                return FALSE;
 502             }
 503             break;
 504          default:
 505             return FALSE;
 506          }
 507       }
 508       return TRUE;
 509
 510    default:
 511       /*
 512        * Handle all others on a case by case basis.
 513        */
 514
 515       switch (format_desc->format) {
 516       case PIPE_FORMAT_R1_UNORM:
 517       case PIPE_FORMAT_UYVY:
 518       case PIPE_FORMAT_YUYV:
 519       case PIPE_FORMAT_R8G8_B8G8_UNORM:
 520       case PIPE_FORMAT_G8R8_G8B8_UNORM:
 521          return TRUE;
 522
 523       default:
 524          return FALSE;
 525       }
 526    }
 527 }
 528
 529
 530 boolean
 531 util_format_translate(enum pipe_format dst_format,
 532                       void *dst, unsigned dst_stride,
 533                       unsigned dst_x, unsigned dst_y,
 534                       enum pipe_format src_format,
 535                       const void *src, unsigned src_stride,
 536                       unsigned src_x, unsigned src_y,
 537                       unsigned width, unsigned height)
 538 {
 539    const struct util_format_description *dst_format_desc;
 540    const struct util_format_description *src_format_desc;
 541    uint8_t *dst_row;
 542    const uint8_t *src_row;
 543    unsigned x_step, y_step;
 544    unsigned dst_step;
 545    unsigned src_step;
 546
 547    dst_format_desc = util_format_description(dst_format);
 548    src_format_desc = util_format_description(src_format);
 549
 550    if (util_is_format_compatible(src_format_desc, dst_format_desc)) {
 551       /*
 552        * Trivial case.
 553        */
 554
 555       util_copy_rect(dst, dst_format, dst_stride,  dst_x, dst_y,
 556                      width, height, src, (int)src_stride,
 557                      src_x, src_y);
 558       return TRUE;
 559    }
 560
 561    assert(dst_x % dst_format_desc->block.width == 0);
 562    assert(dst_y % dst_format_desc->block.height == 0);
 563    assert(src_x % src_format_desc->block.width == 0);
 564    assert(src_y % src_format_desc->block.height == 0);
 565
 566    dst_row = (uint8_t *)dst + dst_y*dst_stride + dst_x*(dst_format_desc->block.bits/8);
 567    src_row = (const uint8_t *)src + src_y*src_stride + src_x*(src_format_desc->block.bits/8);
 568
 569    /*
 570     * This works because all pixel formats have pixel blocks with power of two
 571     * sizes.
 572     */
 573
 574    y_step = MAX2(dst_format_desc->block.height, src_format_desc->block.height);
 575    x_step = MAX2(dst_format_desc->block.width, src_format_desc->block.width);
 576    assert(y_step % dst_format_desc->block.height == 0);
 577    assert(y_step % src_format_desc->block.height == 0);
 578
 579    dst_step = y_step / dst_format_desc->block.height * dst_stride;
 580    src_step = y_step / src_format_desc->block.height * src_stride;
 581
 582    /*
 583     * TODO: double formats will loose precision
 584     * TODO: Add a special case for formats that are mere swizzles of each other
 585     */
 586
 587    if (src_format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS ||
 588        dst_format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS) {
 589       float *tmp_z = NULL;
 590       uint8_t *tmp_s = NULL;
 591
 592       assert(x_step == 1);
 593       assert(y_step == 1);
 594
 595       if (src_format_desc->unpack_z_float &&
 596           dst_format_desc->pack_z_float) {
 597          tmp_z = MALLOC(width * sizeof *tmp_z);
 598       }
 599
 600       if (src_format_desc->unpack_s_8uint &&
 601           dst_format_desc->pack_s_8uint) {
 602          tmp_s = MALLOC(width * sizeof *tmp_s);
 603       }
 604
 605       while (height--) {
 606          if (tmp_z) {
 607             src_format_desc->unpack_z_float(tmp_z, 0, src_row, src_stride, width, 1);
 608             dst_format_desc->pack_z_float(dst_row, dst_stride, tmp_z, 0, width, 1);
 609          }
 610
 611          if (tmp_s) {
 612             src_format_desc->unpack_s_8uint(tmp_s, 0, src_row, src_stride, width, 1);
 613             dst_format_desc->pack_s_8uint(dst_row, dst_stride, tmp_s, 0, width, 1);
 614          }
 615
 616          dst_row += dst_step;
 617          src_row += src_step;
 618       }
 619
 620       FREE(tmp_s);
 621
 622       FREE(tmp_z);
 623
 624       return TRUE;
 625    }
 626
 627    if (util_format_fits_8unorm(src_format_desc) ||
 628        util_format_fits_8unorm(dst_format_desc)) {
 629       unsigned tmp_stride;
 630       uint8_t *tmp_row;
 631
 632       if (!src_format_desc->unpack_rgba_8unorm ||
 633           !dst_format_desc->pack_rgba_8unorm) {
 634          return FALSE;
 635       }
 636
 637       tmp_stride = MAX2(width, x_step) * 4 * sizeof *tmp_row;
 638       tmp_row = MALLOC(y_step * tmp_stride);
 639       if (!tmp_row)
 640          return FALSE;
 641
 642       while (height >= y_step) {
 643          src_format_desc->unpack_rgba_8unorm(tmp_row, tmp_stride, src_row, src_stride, width, y_step);
 644          dst_format_desc->pack_rgba_8unorm(dst_row, dst_stride, tmp_row, tmp_stride, width, y_step);
 645
 646          dst_row += dst_step;
 647          src_row += src_step;
 648          height -= y_step;
 649       }
 650
 651       if (height) {
 652          src_format_desc->unpack_rgba_8unorm(tmp_row, tmp_stride, src_row, src_stride, width, height);
 653          dst_format_desc->pack_rgba_8unorm(dst_row, dst_stride, tmp_row, tmp_stride, width, height);
 654       }
 655
 656       FREE(tmp_row);
 657    }
 658    else {
 659       unsigned tmp_stride;
 660       float *tmp_row;
 661
 662       if (!src_format_desc->unpack_rgba_float ||
 663           !dst_format_desc->pack_rgba_float) {
 664          return FALSE;
 665       }
 666
 667       tmp_stride = MAX2(width, x_step) * 4 * sizeof *tmp_row;
 668       tmp_row = MALLOC(y_step * tmp_stride);
 669       if (!tmp_row)
 670          return FALSE;
 671
 672       while (height >= y_step) {
 673          src_format_desc->unpack_rgba_float(tmp_row, tmp_stride, src_row, src_stride, width, y_step);
 674          dst_format_desc->pack_rgba_float(dst_row, dst_stride, tmp_row, tmp_stride, width, y_step);
 675
 676          dst_row += dst_step;
 677          src_row += src_step;
 678          height -= y_step;
 679       }
 680
 681       if (height) {
 682          src_format_desc->unpack_rgba_float(tmp_row, tmp_stride, src_row, src_stride, width, height);
 683          dst_format_desc->pack_rgba_float(dst_row, dst_stride, tmp_row, tmp_stride, width, height);
 684       }
 685
 686       FREE(tmp_row);
 687    }
 688    return TRUE;
 689 }
 690
 691 void util_format_compose_swizzles(const unsigned char swz1[4],
 692                                   const unsigned char swz2[4],
 693                                   unsigned char dst[4])
 694 {
 695    unsigned i;
 696
 697    for (i = 0; i < 4; i++) {
 698       dst[i] = swz2[i] <= UTIL_FORMAT_SWIZZLE_W ?
 699                swz1[swz2[i]] : swz2[i];
 700    }
 701 }
 702
 703 void util_format_apply_color_swizzle(union pipe_color_union *dst,
 704                                      const union pipe_color_union *src,
 705                                      const unsigned char swz[4],
 706                                      const boolean is_integer)
 707 {
 708    unsigned c;
 709
 710    if (is_integer) {
 711       for (c = 0; c < 4; ++c) {
 712          switch (swz[c]) {
 713          case PIPE_SWIZZLE_RED:   dst->ui[c] = src->ui[0]; break;
 714          case PIPE_SWIZZLE_GREEN: dst->ui[c] = src->ui[1]; break;
 715          case PIPE_SWIZZLE_BLUE:  dst->ui[c] = src->ui[2]; break;
 716          case PIPE_SWIZZLE_ALPHA: dst->ui[c] = src->ui[3]; break;
 717          default:
 718             dst->ui[c] = (swz[c] == PIPE_SWIZZLE_ONE) ? 1 : 0;
 719             break;
 720          }
 721       }
 722    } else {
 723       for (c = 0; c < 4; ++c) {
 724          switch (swz[c]) {
 725          case PIPE_SWIZZLE_RED:   dst->f[c] = src->f[0]; break;
 726          case PIPE_SWIZZLE_GREEN: dst->f[c] = src->f[1]; break;
 727          case PIPE_SWIZZLE_BLUE:  dst->f[c] = src->f[2]; break;
 728          case PIPE_SWIZZLE_ALPHA: dst->f[c] = src->f[3]; break;
 729          default:
 730             dst->f[c] = (swz[c] == PIPE_SWIZZLE_ONE) ? 1.0f : 0.0f;
 731             break;
 732          }
 733       }
 734    }
 735 }
 736
 737 void util_format_swizzle_4f(float *dst, const float *src,
 738                             const unsigned char swz[4])
 739 {
 740    unsigned i;
 741
 742    for (i = 0; i < 4; i++) {
 743       if (swz[i] <= UTIL_FORMAT_SWIZZLE_W)
 744          dst[i] = src[swz[i]];
 745       else if (swz[i] == UTIL_FORMAT_SWIZZLE_0)
 746          dst[i] = 0;
 747       else if (swz[i] == UTIL_FORMAT_SWIZZLE_1)
 748          dst[i] = 1;
 749    }
 750 }
 751
 752 void util_format_unswizzle_4f(float *dst, const float *src,
 753                               const unsigned char swz[4])
 754 {
 755    unsigned i;
 756
 757    for (i = 0; i < 4; i++) {
 758       switch (swz[i]) {
 759       case UTIL_FORMAT_SWIZZLE_X:
 760          dst[0] = src[i];
 761          break;
 762       case UTIL_FORMAT_SWIZZLE_Y:
 763          dst[1] = src[i];
 764          break;
 765       case UTIL_FORMAT_SWIZZLE_Z:
 766          dst[2] = src[i];
 767          break;
 768       case UTIL_FORMAT_SWIZZLE_W:
 769          dst[3] = src[i];
 770          break;
 771       }
 772    }
 773 }