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    int 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 < 0) {
  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] != PIPE_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] == PIPE_SWIZZLE_X &&
  86        desc->swizzle[1] == PIPE_SWIZZLE_X &&
  87        desc->swizzle[2] == PIPE_SWIZZLE_X &&
  88        desc->swizzle[3] == PIPE_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] == PIPE_SWIZZLE_0 &&
 103        desc->swizzle[1] == PIPE_SWIZZLE_0 &&
 104        desc->swizzle[2] == PIPE_SWIZZLE_0 &&
 105        desc->swizzle[3] == PIPE_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_snorm8(enum pipe_format format)
 174 {
 175    const struct util_format_description *desc = util_format_description(format);
 176    int i;
 177
 178    if (desc->is_mixed)
 179       return FALSE;
 180
 181    i = util_format_get_first_non_void_channel(format);
 182    if (i == -1)
 183       return FALSE;
 184
 185    return desc->channel[i].type == UTIL_FORMAT_TYPE_SIGNED &&
 186           !desc->channel[i].pure_integer &&
 187           desc->channel[i].normalized &&
 188           desc->channel[i].size == 8;
 189 }
 190
 191 boolean
 192 util_format_is_luminance_alpha(enum pipe_format format)
 193 {
 194    const struct util_format_description *desc =
 195       util_format_description(format);
 196
 197    if ((desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||
 198         desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) &&
 199        desc->swizzle[0] == PIPE_SWIZZLE_X &&
 200        desc->swizzle[1] == PIPE_SWIZZLE_X &&
 201        desc->swizzle[2] == PIPE_SWIZZLE_X &&
 202        desc->swizzle[3] == PIPE_SWIZZLE_Y) {
 203       return TRUE;
 204    }
 205    return FALSE;
 206 }
 207
 208
 209 boolean
 210 util_format_is_intensity(enum pipe_format format)
 211 {
 212    const struct util_format_description *desc =
 213       util_format_description(format);
 214
 215    if ((desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||
 216         desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) &&
 217        desc->swizzle[0] == PIPE_SWIZZLE_X &&
 218        desc->swizzle[1] == PIPE_SWIZZLE_X &&
 219        desc->swizzle[2] == PIPE_SWIZZLE_X &&
 220        desc->swizzle[3] == PIPE_SWIZZLE_X) {
 221       return TRUE;
 222    }
 223    return FALSE;
 224 }
 225
 226 boolean
 227 util_format_is_subsampled_422(enum pipe_format format)
 228 {
 229    const struct util_format_description *desc =
 230       util_format_description(format);
 231
 232    return desc->layout == UTIL_FORMAT_LAYOUT_SUBSAMPLED &&
 233       desc->block.width == 2 &&
 234       desc->block.height == 1 &&
 235       desc->block.bits == 32;
 236 }
 237
 238 boolean
 239 util_format_is_supported(enum pipe_format format, unsigned bind)
 240 {
 241    if (format >= PIPE_FORMAT_COUNT) {
 242       return FALSE;
 243    }
 244
 245    if (util_format_is_s3tc(format) && !util_format_s3tc_enabled) {
 246       return FALSE;
 247    }
 248
 249 #ifndef TEXTURE_FLOAT_ENABLED
 250    if ((bind & PIPE_BIND_RENDER_TARGET) &&
 251        format != PIPE_FORMAT_R9G9B9E5_FLOAT &&
 252        format != PIPE_FORMAT_R11G11B10_FLOAT &&
 253        util_format_is_float(format)) {
 254       return FALSE;
 255    }
 256 #endif
 257
 258    return TRUE;
 259 }
 260
 261
 262 /**
 263  * Calculates the MRD for the depth format. MRD is used in depth bias
 264  * for UNORM and unbound depth buffers. When the depth buffer is floating
 265  * point, the depth bias calculation does not use the MRD. However, the
 266  * default MRD will be 1.0 / ((1 << 24) - 1).
 267  */
 268 double
 269 util_get_depth_format_mrd(const struct util_format_description *desc)
 270 {
 271    /*
 272     * Depth buffer formats without a depth component OR scenarios
 273     * without a bound depth buffer default to D24.
 274     */
 275    double mrd = 1.0 / ((1 << 24) - 1);
 276    unsigned depth_channel;
 277
 278    assert(desc);
 279
 280    /*
 281     * Some depth formats do not store the depth component in the first
 282     * channel, detect the format and adjust the depth channel. Get the
 283     * swizzled depth component channel.
 284     */
 285    depth_channel = desc->swizzle[0];
 286
 287    if (desc->channel[depth_channel].type == UTIL_FORMAT_TYPE_UNSIGNED &&
 288        desc->channel[depth_channel].normalized) {
 289       int depth_bits;
 290
 291       depth_bits = desc->channel[depth_channel].size;
 292       mrd = 1.0 / ((1ULL << depth_bits) - 1);
 293    }
 294
 295    return mrd;
 296 }
 297
 298
 299 void
 300 util_format_read_4f(enum pipe_format format,
 301                     float *dst, unsigned dst_stride,
 302                     const void *src, unsigned src_stride,
 303                     unsigned x, unsigned y, unsigned w, unsigned h)
 304 {
 305    const struct util_format_description *format_desc;
 306    const uint8_t *src_row;
 307    float *dst_row;
 308
 309    format_desc = util_format_description(format);
 310
 311    assert(x % format_desc->block.width == 0);
 312    assert(y % format_desc->block.height == 0);
 313
 314    src_row = (const uint8_t *)src + y*src_stride + x*(format_desc->block.bits/8);
 315    dst_row = dst;
 316
 317    format_desc->unpack_rgba_float(dst_row, dst_stride, src_row, src_stride, w, h);
 318 }
 319
 320
 321 void
 322 util_format_write_4f(enum pipe_format format,
 323                      const float *src, unsigned src_stride,
 324                      void *dst, unsigned dst_stride,
 325                      unsigned x, unsigned y, unsigned w, unsigned h)
 326 {
 327    const struct util_format_description *format_desc;
 328    uint8_t *dst_row;
 329    const float *src_row;
 330
 331    format_desc = util_format_description(format);
 332
 333    assert(x % format_desc->block.width == 0);
 334    assert(y % format_desc->block.height == 0);
 335
 336    dst_row = (uint8_t *)dst + y*dst_stride + x*(format_desc->block.bits/8);
 337    src_row = src;
 338
 339    format_desc->pack_rgba_float(dst_row, dst_stride, src_row, src_stride, w, h);
 340 }
 341
 342
 343 void
 344 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)
 345 {
 346    const struct util_format_description *format_desc;
 347    const uint8_t *src_row;
 348    uint8_t *dst_row;
 349
 350    format_desc = util_format_description(format);
 351
 352    assert(x % format_desc->block.width == 0);
 353    assert(y % format_desc->block.height == 0);
 354
 355    src_row = (const uint8_t *)src + y*src_stride + x*(format_desc->block.bits/8);
 356    dst_row = dst;
 357
 358    format_desc->unpack_rgba_8unorm(dst_row, dst_stride, src_row, src_stride, w, h);
 359 }
 360
 361
 362 void
 363 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)
 364 {
 365    const struct util_format_description *format_desc;
 366    uint8_t *dst_row;
 367    const uint8_t *src_row;
 368
 369    format_desc = util_format_description(format);
 370
 371    assert(x % format_desc->block.width == 0);
 372    assert(y % format_desc->block.height == 0);
 373
 374    dst_row = (uint8_t *)dst + y*dst_stride + x*(format_desc->block.bits/8);
 375    src_row = src;
 376
 377    format_desc->pack_rgba_8unorm(dst_row, dst_stride, src_row, src_stride, w, h);
 378 }
 379
 380 void
 381 util_format_read_4ui(enum pipe_format format,
 382                      unsigned *dst, unsigned dst_stride,
 383                      const void *src, unsigned src_stride,
 384                      unsigned x, unsigned y, unsigned w, unsigned h)
 385 {
 386    const struct util_format_description *format_desc;
 387    const uint8_t *src_row;
 388    uint32_t *dst_row;
 389
 390    format_desc = util_format_description(format);
 391
 392    assert(x % format_desc->block.width == 0);
 393    assert(y % format_desc->block.height == 0);
 394
 395    src_row = (const uint8_t *)src + y*src_stride + x*(format_desc->block.bits/8);
 396    dst_row = dst;
 397
 398    format_desc->unpack_rgba_uint(dst_row, dst_stride, src_row, src_stride, w, h);
 399 }
 400
 401 void
 402 util_format_write_4ui(enum pipe_format format,
 403                       const unsigned int *src, unsigned src_stride,
 404                       void *dst, unsigned dst_stride,
 405                       unsigned x, unsigned y, unsigned w, unsigned h)
 406 {
 407    const struct util_format_description *format_desc;
 408    uint8_t *dst_row;
 409    const uint32_t *src_row;
 410
 411    format_desc = util_format_description(format);
 412
 413    assert(x % format_desc->block.width == 0);
 414    assert(y % format_desc->block.height == 0);
 415
 416    dst_row = (uint8_t *)dst + y*dst_stride + x*(format_desc->block.bits/8);
 417    src_row = src;
 418
 419    format_desc->pack_rgba_uint(dst_row, dst_stride, src_row, src_stride, w, h);
 420 }
 421
 422 void
 423 util_format_read_4i(enum pipe_format format,
 424                     int *dst, unsigned dst_stride,
 425                     const void *src, unsigned src_stride,
 426                     unsigned x, unsigned y, unsigned w, unsigned h)
 427 {
 428    const struct util_format_description *format_desc;
 429    const uint8_t *src_row;
 430    int32_t *dst_row;
 431
 432    format_desc = util_format_description(format);
 433
 434    assert(x % format_desc->block.width == 0);
 435    assert(y % format_desc->block.height == 0);
 436
 437    src_row = (const uint8_t *)src + y*src_stride + x*(format_desc->block.bits/8);
 438    dst_row = dst;
 439
 440    format_desc->unpack_rgba_sint(dst_row, dst_stride, src_row, src_stride, w, h);
 441 }
 442
 443 void
 444 util_format_write_4i(enum pipe_format format,
 445                       const int *src, unsigned src_stride,
 446                       void *dst, unsigned dst_stride,
 447                       unsigned x, unsigned y, unsigned w, unsigned h)
 448 {
 449    const struct util_format_description *format_desc;
 450    uint8_t *dst_row;
 451    const int32_t *src_row;
 452
 453    format_desc = util_format_description(format);
 454
 455    assert(x % format_desc->block.width == 0);
 456    assert(y % format_desc->block.height == 0);
 457
 458    dst_row = (uint8_t *)dst + y*dst_stride + x*(format_desc->block.bits/8);
 459    src_row = src;
 460
 461    format_desc->pack_rgba_sint(dst_row, dst_stride, src_row, src_stride, w, h);
 462 }
 463
 464 /**
 465  * Check if we can safely memcopy from the source format to the dest format.
 466  * This basically covers the cases of a "used" channel copied to a typeless
 467  * channel, plus some 1-channel cases.
 468  * Examples of compatible copy formats include:
 469  *    b8g8r8a8_unorm -> b8g8r8x8_unorm
 470  *    a8r8g8b8_unorm -> x8r8g8b8_unorm
 471  *    b5g5r5a1_unorm -> b5g5r5x1_unorm
 472  *    b4g4r4a4_unorm -> b4g4r4x4_unorm
 473  *    l8_unorm -> r8_unorm
 474  *    i8_unorm -> l8_unorm
 475  *    i8_unorm -> a8_unorm
 476  *    i8_unorm -> r8_unorm
 477  *    l16_unorm -> r16_unorm
 478  *    z24_unorm_s8_uint -> z24x8_unorm
 479  *    s8_uint_z24_unorm -> x8z24_unorm
 480  *    r8g8b8a8_unorm -> r8g8b8x8_unorm
 481  *    a8b8g8r8_srgb -> x8b8g8r8_srgb
 482  *    b8g8r8a8_srgb -> b8g8r8x8_srgb
 483  *    a8r8g8b8_srgb -> x8r8g8b8_srgb
 484  *    a8b8g8r8_unorm -> x8b8g8r8_unorm
 485  *    r10g10b10a2_uscaled -> r10g10b10x2_uscaled
 486  *    r10sg10sb10sa2u_norm -> r10g10b10x2_snorm
 487  */
 488 boolean
 489 util_is_format_compatible(const struct util_format_description *src_desc,
 490                           const struct util_format_description *dst_desc)
 491 {
 492    unsigned chan;
 493
 494    if (src_desc->format == dst_desc->format) {
 495       return TRUE;
 496    }
 497
 498    if (src_desc->layout != UTIL_FORMAT_LAYOUT_PLAIN ||
 499        dst_desc->layout != UTIL_FORMAT_LAYOUT_PLAIN) {
 500       return FALSE;
 501    }
 502
 503    if (src_desc->block.bits != dst_desc->block.bits ||
 504        src_desc->nr_channels != dst_desc->nr_channels ||
 505        src_desc->colorspace != dst_desc->colorspace) {
 506       return FALSE;
 507    }
 508
 509    for (chan = 0; chan < 4; ++chan) {
 510       if (src_desc->channel[chan].size !=
 511           dst_desc->channel[chan].size) {
 512          return FALSE;
 513       }
 514    }
 515
 516    for (chan = 0; chan < 4; ++chan) {
 517       enum pipe_swizzle swizzle = dst_desc->swizzle[chan];
 518
 519       if (swizzle < 4) {
 520          if (src_desc->swizzle[chan] != swizzle) {
 521             return FALSE;
 522          }
 523          if ((src_desc->channel[swizzle].type !=
 524               dst_desc->channel[swizzle].type) ||
 525              (src_desc->channel[swizzle].normalized !=
 526               dst_desc->channel[swizzle].normalized)) {
 527             return FALSE;
 528          }
 529       }
 530    }
 531
 532    return TRUE;
 533 }
 534
 535
 536 boolean
 537 util_format_fits_8unorm(const struct util_format_description *format_desc)
 538 {
 539    unsigned chan;
 540
 541    /*
 542     * After linearized sRGB values require more than 8bits.
 543     */
 544
 545    if (format_desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) {
 546       return FALSE;
 547    }
 548
 549    switch (format_desc->layout) {
 550
 551    case UTIL_FORMAT_LAYOUT_S3TC:
 552       /*
 553        * These are straight forward.
 554        */
 555       return TRUE;
 556    case UTIL_FORMAT_LAYOUT_RGTC:
 557       if (format_desc->format == PIPE_FORMAT_RGTC1_SNORM ||
 558           format_desc->format == PIPE_FORMAT_RGTC2_SNORM ||
 559           format_desc->format == PIPE_FORMAT_LATC1_SNORM ||
 560           format_desc->format == PIPE_FORMAT_LATC2_SNORM)
 561          return FALSE;
 562       return TRUE;
 563    case UTIL_FORMAT_LAYOUT_BPTC:
 564       if (format_desc->format == PIPE_FORMAT_BPTC_RGBA_UNORM)
 565          return TRUE;
 566       return FALSE;
 567
 568    case UTIL_FORMAT_LAYOUT_ETC:
 569       if (format_desc->format == PIPE_FORMAT_ETC1_RGB8)
 570          return TRUE;
 571       return FALSE;
 572
 573    case UTIL_FORMAT_LAYOUT_PLAIN:
 574       /*
 575        * For these we can find a generic rule.
 576        */
 577
 578       for (chan = 0; chan < format_desc->nr_channels; ++chan) {
 579          switch (format_desc->channel[chan].type) {
 580          case UTIL_FORMAT_TYPE_VOID:
 581             break;
 582          case UTIL_FORMAT_TYPE_UNSIGNED:
 583             if (!format_desc->channel[chan].normalized ||
 584                 format_desc->channel[chan].size > 8) {
 585                return FALSE;
 586             }
 587             break;
 588          default:
 589             return FALSE;
 590          }
 591       }
 592       return TRUE;
 593
 594    default:
 595       /*
 596        * Handle all others on a case by case basis.
 597        */
 598
 599       switch (format_desc->format) {
 600       case PIPE_FORMAT_R1_UNORM:
 601       case PIPE_FORMAT_UYVY:
 602       case PIPE_FORMAT_YUYV:
 603       case PIPE_FORMAT_R8G8_B8G8_UNORM:
 604       case PIPE_FORMAT_G8R8_G8B8_UNORM:
 605          return TRUE;
 606
 607       default:
 608          return FALSE;
 609       }
 610    }
 611 }
 612
 613
 614 boolean
 615 util_format_translate(enum pipe_format dst_format,
 616                       void *dst, unsigned dst_stride,
 617                       unsigned dst_x, unsigned dst_y,
 618                       enum pipe_format src_format,
 619                       const void *src, unsigned src_stride,
 620                       unsigned src_x, unsigned src_y,
 621                       unsigned width, unsigned height)
 622 {
 623    const struct util_format_description *dst_format_desc;
 624    const struct util_format_description *src_format_desc;
 625    uint8_t *dst_row;
 626    const uint8_t *src_row;
 627    unsigned x_step, y_step;
 628    unsigned dst_step;
 629    unsigned src_step;
 630
 631    dst_format_desc = util_format_description(dst_format);
 632    src_format_desc = util_format_description(src_format);
 633
 634    if (util_is_format_compatible(src_format_desc, dst_format_desc)) {
 635       /*
 636        * Trivial case.
 637        */
 638
 639       util_copy_rect(dst, dst_format, dst_stride,  dst_x, dst_y,
 640                      width, height, src, (int)src_stride,
 641                      src_x, src_y);
 642       return TRUE;
 643    }
 644
 645    assert(dst_x % dst_format_desc->block.width == 0);
 646    assert(dst_y % dst_format_desc->block.height == 0);
 647    assert(src_x % src_format_desc->block.width == 0);
 648    assert(src_y % src_format_desc->block.height == 0);
 649
 650    dst_row = (uint8_t *)dst + dst_y*dst_stride + dst_x*(dst_format_desc->block.bits/8);
 651    src_row = (const uint8_t *)src + src_y*src_stride + src_x*(src_format_desc->block.bits/8);
 652
 653    /*
 654     * This works because all pixel formats have pixel blocks with power of two
 655     * sizes.
 656     */
 657
 658    y_step = MAX2(dst_format_desc->block.height, src_format_desc->block.height);
 659    x_step = MAX2(dst_format_desc->block.width, src_format_desc->block.width);
 660    assert(y_step % dst_format_desc->block.height == 0);
 661    assert(y_step % src_format_desc->block.height == 0);
 662
 663    dst_step = y_step / dst_format_desc->block.height * dst_stride;
 664    src_step = y_step / src_format_desc->block.height * src_stride;
 665
 666    /*
 667     * TODO: double formats will loose precision
 668     * TODO: Add a special case for formats that are mere swizzles of each other
 669     */
 670
 671    if (src_format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS ||
 672        dst_format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS) {
 673       float *tmp_z = NULL;
 674       uint8_t *tmp_s = NULL;
 675
 676       assert(x_step == 1);
 677       assert(y_step == 1);
 678
 679       if (src_format_desc->unpack_z_float &&
 680           dst_format_desc->pack_z_float) {
 681          tmp_z = MALLOC(width * sizeof *tmp_z);
 682       }
 683
 684       if (src_format_desc->unpack_s_8uint &&
 685           dst_format_desc->pack_s_8uint) {
 686          tmp_s = MALLOC(width * sizeof *tmp_s);
 687       }
 688
 689       while (height--) {
 690          if (tmp_z) {
 691             src_format_desc->unpack_z_float(tmp_z, 0, src_row, src_stride, width, 1);
 692             dst_format_desc->pack_z_float(dst_row, dst_stride, tmp_z, 0, width, 1);
 693          }
 694
 695          if (tmp_s) {
 696             src_format_desc->unpack_s_8uint(tmp_s, 0, src_row, src_stride, width, 1);
 697             dst_format_desc->pack_s_8uint(dst_row, dst_stride, tmp_s, 0, width, 1);
 698          }
 699
 700          dst_row += dst_step;
 701          src_row += src_step;
 702       }
 703
 704       FREE(tmp_s);
 705
 706       FREE(tmp_z);
 707
 708       return TRUE;
 709    }
 710
 711    if (util_format_fits_8unorm(src_format_desc) ||
 712        util_format_fits_8unorm(dst_format_desc)) {
 713       unsigned tmp_stride;
 714       uint8_t *tmp_row;
 715
 716       if (!src_format_desc->unpack_rgba_8unorm ||
 717           !dst_format_desc->pack_rgba_8unorm) {
 718          return FALSE;
 719       }
 720
 721       tmp_stride = MAX2(width, x_step) * 4 * sizeof *tmp_row;
 722       tmp_row = MALLOC(y_step * tmp_stride);
 723       if (!tmp_row)
 724          return FALSE;
 725
 726       while (height >= y_step) {
 727          src_format_desc->unpack_rgba_8unorm(tmp_row, tmp_stride, src_row, src_stride, width, y_step);
 728          dst_format_desc->pack_rgba_8unorm(dst_row, dst_stride, tmp_row, tmp_stride, width, y_step);
 729
 730          dst_row += dst_step;
 731          src_row += src_step;
 732          height -= y_step;
 733       }
 734
 735       if (height) {
 736          src_format_desc->unpack_rgba_8unorm(tmp_row, tmp_stride, src_row, src_stride, width, height);
 737          dst_format_desc->pack_rgba_8unorm(dst_row, dst_stride, tmp_row, tmp_stride, width, height);
 738       }
 739
 740       FREE(tmp_row);
 741    }
 742    else {
 743       unsigned tmp_stride;
 744       float *tmp_row;
 745
 746       if (!src_format_desc->unpack_rgba_float ||
 747           !dst_format_desc->pack_rgba_float) {
 748          return FALSE;
 749       }
 750
 751       tmp_stride = MAX2(width, x_step) * 4 * sizeof *tmp_row;
 752       tmp_row = MALLOC(y_step * tmp_stride);
 753       if (!tmp_row)
 754          return FALSE;
 755
 756       while (height >= y_step) {
 757          src_format_desc->unpack_rgba_float(tmp_row, tmp_stride, src_row, src_stride, width, y_step);
 758          dst_format_desc->pack_rgba_float(dst_row, dst_stride, tmp_row, tmp_stride, width, y_step);
 759
 760          dst_row += dst_step;
 761          src_row += src_step;
 762          height -= y_step;
 763       }
 764
 765       if (height) {
 766          src_format_desc->unpack_rgba_float(tmp_row, tmp_stride, src_row, src_stride, width, height);
 767          dst_format_desc->pack_rgba_float(dst_row, dst_stride, tmp_row, tmp_stride, width, height);
 768       }
 769
 770       FREE(tmp_row);
 771    }
 772    return TRUE;
 773 }
 774
 775 boolean
 776 util_format_translate_3d(enum pipe_format dst_format,
 777                          void *dst, unsigned dst_stride,
 778                          unsigned dst_slice_stride,
 779                          unsigned dst_x, unsigned dst_y,
 780                          unsigned dst_z,
 781                          enum pipe_format src_format,
 782                          const void *src, unsigned src_stride,
 783                          unsigned src_slice_stride,
 784                          unsigned src_x, unsigned src_y,
 785                          unsigned src_z, unsigned width,
 786                          unsigned height, unsigned depth)
 787 {
 788    uint8_t *dst_layer;
 789    const uint8_t *src_layer;
 790    unsigned z;
 791    dst_layer = dst;
 792    src_layer = src;
 793    dst_layer += dst_z * dst_slice_stride;
 794    src_layer += src_z * src_slice_stride;
 795    for (z = 0; z < depth; ++z) {
 796       if (!util_format_translate(dst_format, dst_layer, dst_stride,
 797                                  dst_x, dst_y,
 798                                  src_format, src_layer, src_stride,
 799                                  src_x, src_y,
 800                                  width, height))
 801           return FALSE;
 802
 803       dst_layer += dst_slice_stride;
 804       src_layer += src_slice_stride;
 805    }
 806    return TRUE;
 807 }
 808
 809 void util_format_compose_swizzles(const unsigned char swz1[4],
 810                                   const unsigned char swz2[4],
 811                                   unsigned char dst[4])
 812 {
 813    unsigned i;
 814
 815    for (i = 0; i < 4; i++) {
 816       dst[i] = swz2[i] <= PIPE_SWIZZLE_W ?
 817                swz1[swz2[i]] : swz2[i];
 818    }
 819 }
 820
 821 void util_format_apply_color_swizzle(union pipe_color_union *dst,
 822                                      const union pipe_color_union *src,
 823                                      const unsigned char swz[4],
 824                                      const boolean is_integer)
 825 {
 826    unsigned c;
 827
 828    if (is_integer) {
 829       for (c = 0; c < 4; ++c) {
 830          switch (swz[c]) {
 831          case PIPE_SWIZZLE_X:   dst->ui[c] = src->ui[0]; break;
 832          case PIPE_SWIZZLE_Y: dst->ui[c] = src->ui[1]; break;
 833          case PIPE_SWIZZLE_Z:  dst->ui[c] = src->ui[2]; break;
 834          case PIPE_SWIZZLE_W: dst->ui[c] = src->ui[3]; break;
 835          default:
 836             dst->ui[c] = (swz[c] == PIPE_SWIZZLE_1) ? 1 : 0;
 837             break;
 838          }
 839       }
 840    } else {
 841       for (c = 0; c < 4; ++c) {
 842          switch (swz[c]) {
 843          case PIPE_SWIZZLE_X:   dst->f[c] = src->f[0]; break;
 844          case PIPE_SWIZZLE_Y: dst->f[c] = src->f[1]; break;
 845          case PIPE_SWIZZLE_Z:  dst->f[c] = src->f[2]; break;
 846          case PIPE_SWIZZLE_W: dst->f[c] = src->f[3]; break;
 847          default:
 848             dst->f[c] = (swz[c] == PIPE_SWIZZLE_1) ? 1.0f : 0.0f;
 849             break;
 850          }
 851       }
 852    }
 853 }
 854
 855 void pipe_swizzle_4f(float *dst, const float *src,
 856                             const unsigned char swz[4])
 857 {
 858    unsigned i;
 859
 860    for (i = 0; i < 4; i++) {
 861       if (swz[i] <= PIPE_SWIZZLE_W)
 862          dst[i] = src[swz[i]];
 863       else if (swz[i] == PIPE_SWIZZLE_0)
 864          dst[i] = 0;
 865       else if (swz[i] == PIPE_SWIZZLE_1)
 866          dst[i] = 1;
 867    }
 868 }
 869
 870 void util_format_unswizzle_4f(float *dst, const float *src,
 871                               const unsigned char swz[4])
 872 {
 873    unsigned i;
 874
 875    for (i = 0; i < 4; i++) {
 876       switch (swz[i]) {
 877       case PIPE_SWIZZLE_X:
 878          dst[0] = src[i];
 879          break;
 880       case PIPE_SWIZZLE_Y:
 881          dst[1] = src[i];
 882          break;
 883       case PIPE_SWIZZLE_Z:
 884          dst[2] = src[i];
 885          break;
 886       case PIPE_SWIZZLE_W:
 887          dst[3] = src[i];
 888          break;
 889       }
 890    }
 891 }