src/util/format/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 "util/format/u_format.h"
  36 #include "util/format/u_format_s3tc.h"
  37 #include "util/u_math.h"
  38
  39 #include "pipe/p_defines.h"
  40 #include "pipe/p_screen.h"
  41
  42
  43 /**
  44  * Copy 2D rect from one place to another.
  45  * Position and sizes are in pixels.
  46  * src_stride may be negative to do vertical flip of pixels from source.
  47  */
  48 void
  49 util_copy_rect(ubyte * dst,
  50                enum pipe_format format,
  51                unsigned dst_stride,
  52                unsigned dst_x,
  53                unsigned dst_y,
  54                unsigned width,
  55                unsigned height,
  56                const ubyte * src,
  57                int src_stride,
  58                unsigned src_x,
  59                unsigned src_y)
  60 {
  61    unsigned i;
  62    int src_stride_pos = src_stride < 0 ? -src_stride : src_stride;
  63    int blocksize = util_format_get_blocksize(format);
  64    int blockwidth = util_format_get_blockwidth(format);
  65    int blockheight = util_format_get_blockheight(format);
  66
  67    assert(blocksize > 0);
  68    assert(blockwidth > 0);
  69    assert(blockheight > 0);
  70
  71    dst_x /= blockwidth;
  72    dst_y /= blockheight;
  73    width = (width + blockwidth - 1)/blockwidth;
  74    height = (height + blockheight - 1)/blockheight;
  75    src_x /= blockwidth;
  76    src_y /= blockheight;
  77
  78    dst += dst_x * blocksize;
  79    src += src_x * blocksize;
  80    dst += dst_y * dst_stride;
  81    src += src_y * src_stride_pos;
  82    width *= blocksize;
  83
  84    if (width == dst_stride && width == (unsigned)src_stride)
  85       memcpy(dst, src, height * width);
  86    else {
  87       for (i = 0; i < height; i++) {
  88          memcpy(dst, src, width);
  89          dst += dst_stride;
  90          src += src_stride;
  91       }
  92    }
  93 }
  94
  95
  96 boolean
  97 util_format_is_float(enum pipe_format format)
  98 {
  99    const struct util_format_description *desc = util_format_description(format);
 100    int i;
 101
 102    assert(desc);
 103    if (!desc) {
 104       return FALSE;
 105    }
 106
 107    i = util_format_get_first_non_void_channel(format);
 108    if (i < 0) {
 109       return FALSE;
 110    }
 111
 112    return desc->channel[i].type == UTIL_FORMAT_TYPE_FLOAT ? TRUE : FALSE;
 113 }
 114
 115
 116 /** Test if the format contains RGB, but not alpha */
 117 boolean
 118 util_format_has_alpha(enum pipe_format format)
 119 {
 120    const struct util_format_description *desc =
 121       util_format_description(format);
 122
 123    return (desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||
 124            desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) &&
 125           desc->swizzle[3] != PIPE_SWIZZLE_1;
 126 }
 127
 128
 129 boolean
 130 util_format_is_luminance(enum pipe_format format)
 131 {
 132    const struct util_format_description *desc =
 133       util_format_description(format);
 134
 135    if ((desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||
 136         desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) &&
 137        desc->swizzle[0] == PIPE_SWIZZLE_X &&
 138        desc->swizzle[1] == PIPE_SWIZZLE_X &&
 139        desc->swizzle[2] == PIPE_SWIZZLE_X &&
 140        desc->swizzle[3] == PIPE_SWIZZLE_1) {
 141       return TRUE;
 142    }
 143    return FALSE;
 144 }
 145
 146 boolean
 147 util_format_is_alpha(enum pipe_format format)
 148 {
 149    const struct util_format_description *desc =
 150       util_format_description(format);
 151
 152    if ((desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||
 153         desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) &&
 154        desc->swizzle[0] == PIPE_SWIZZLE_0 &&
 155        desc->swizzle[1] == PIPE_SWIZZLE_0 &&
 156        desc->swizzle[2] == PIPE_SWIZZLE_0 &&
 157        desc->swizzle[3] == PIPE_SWIZZLE_X) {
 158       return TRUE;
 159    }
 160    return FALSE;
 161 }
 162
 163 boolean
 164 util_format_is_pure_integer(enum pipe_format format)
 165 {
 166    const struct util_format_description *desc = util_format_description(format);
 167    int i;
 168
 169    /* Find the first non-void channel. */
 170    i = util_format_get_first_non_void_channel(format);
 171    if (i == -1)
 172       return FALSE;
 173
 174    return desc->channel[i].pure_integer ? TRUE : FALSE;
 175 }
 176
 177 boolean
 178 util_format_is_pure_sint(enum pipe_format format)
 179 {
 180    const struct util_format_description *desc = util_format_description(format);
 181    int i;
 182
 183    i = util_format_get_first_non_void_channel(format);
 184    if (i == -1)
 185       return FALSE;
 186
 187    return (desc->channel[i].type == UTIL_FORMAT_TYPE_SIGNED && desc->channel[i].pure_integer) ? TRUE : FALSE;
 188 }
 189
 190 boolean
 191 util_format_is_pure_uint(enum pipe_format format)
 192 {
 193    const struct util_format_description *desc = util_format_description(format);
 194    int i;
 195
 196    i = util_format_get_first_non_void_channel(format);
 197    if (i == -1)
 198       return FALSE;
 199
 200    return (desc->channel[i].type == UTIL_FORMAT_TYPE_UNSIGNED && desc->channel[i].pure_integer) ? TRUE : FALSE;
 201 }
 202
 203 /**
 204  * Returns true if the format contains normalized signed channels.
 205  */
 206 boolean
 207 util_format_is_snorm(enum pipe_format format)
 208 {
 209    const struct util_format_description *desc = util_format_description(format);
 210
 211    return desc->is_snorm;
 212 }
 213
 214 /**
 215  * Returns true if the format contains normalized unsigned channels.
 216  */
 217 boolean
 218 util_format_is_unorm(enum pipe_format format)
 219 {
 220    const struct util_format_description *desc = util_format_description(format);
 221
 222    return desc->is_unorm;
 223 }
 224
 225 boolean
 226 util_format_is_snorm8(enum pipe_format format)
 227 {
 228    const struct util_format_description *desc = util_format_description(format);
 229    int i;
 230
 231    if (desc->is_mixed)
 232       return FALSE;
 233
 234    i = util_format_get_first_non_void_channel(format);
 235    if (i == -1)
 236       return FALSE;
 237
 238    return desc->channel[i].type == UTIL_FORMAT_TYPE_SIGNED &&
 239           !desc->channel[i].pure_integer &&
 240           desc->channel[i].normalized &&
 241           desc->channel[i].size == 8;
 242 }
 243
 244 boolean
 245 util_format_is_luminance_alpha(enum pipe_format format)
 246 {
 247    const struct util_format_description *desc =
 248       util_format_description(format);
 249
 250    if ((desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||
 251         desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) &&
 252        desc->swizzle[0] == PIPE_SWIZZLE_X &&
 253        desc->swizzle[1] == PIPE_SWIZZLE_X &&
 254        desc->swizzle[2] == PIPE_SWIZZLE_X &&
 255        desc->swizzle[3] == PIPE_SWIZZLE_Y) {
 256       return TRUE;
 257    }
 258    return FALSE;
 259 }
 260
 261
 262 boolean
 263 util_format_is_intensity(enum pipe_format format)
 264 {
 265    const struct util_format_description *desc =
 266       util_format_description(format);
 267
 268    if ((desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||
 269         desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) &&
 270        desc->swizzle[0] == PIPE_SWIZZLE_X &&
 271        desc->swizzle[1] == PIPE_SWIZZLE_X &&
 272        desc->swizzle[2] == PIPE_SWIZZLE_X &&
 273        desc->swizzle[3] == PIPE_SWIZZLE_X) {
 274       return TRUE;
 275    }
 276    return FALSE;
 277 }
 278
 279 boolean
 280 util_format_is_subsampled_422(enum pipe_format format)
 281 {
 282    const struct util_format_description *desc =
 283       util_format_description(format);
 284
 285    return desc->layout == UTIL_FORMAT_LAYOUT_SUBSAMPLED &&
 286       desc->block.width == 2 &&
 287       desc->block.height == 1 &&
 288       desc->block.bits == 32;
 289 }
 290
 291 /**
 292  * Calculates the MRD for the depth format. MRD is used in depth bias
 293  * for UNORM and unbound depth buffers. When the depth buffer is floating
 294  * point, the depth bias calculation does not use the MRD. However, the
 295  * default MRD will be 1.0 / ((1 << 24) - 1).
 296  */
 297 double
 298 util_get_depth_format_mrd(const struct util_format_description *desc)
 299 {
 300    /*
 301     * Depth buffer formats without a depth component OR scenarios
 302     * without a bound depth buffer default to D24.
 303     */
 304    double mrd = 1.0 / ((1 << 24) - 1);
 305    unsigned depth_channel;
 306
 307    assert(desc);
 308
 309    /*
 310     * Some depth formats do not store the depth component in the first
 311     * channel, detect the format and adjust the depth channel. Get the
 312     * swizzled depth component channel.
 313     */
 314    depth_channel = desc->swizzle[0];
 315
 316    if (desc->channel[depth_channel].type == UTIL_FORMAT_TYPE_UNSIGNED &&
 317        desc->channel[depth_channel].normalized) {
 318       int depth_bits;
 319
 320       depth_bits = desc->channel[depth_channel].size;
 321       mrd = 1.0 / ((1ULL << depth_bits) - 1);
 322    }
 323
 324    return mrd;
 325 }
 326
 327
 328 void
 329 util_format_read_4(enum pipe_format format,
 330                    void *dst, unsigned dst_stride,
 331                    const void *src, unsigned src_stride,
 332                    unsigned x, unsigned y, unsigned w, unsigned h)
 333 {
 334    const struct util_format_description *format_desc;
 335    const uint8_t *src_row;
 336
 337    format_desc = util_format_description(format);
 338
 339    assert(x % format_desc->block.width == 0);
 340    assert(y % format_desc->block.height == 0);
 341
 342    src_row = (const uint8_t *)src + y*src_stride + x*(format_desc->block.bits/8);
 343
 344    if (util_format_is_pure_uint(format))
 345       format_desc->unpack_rgba_sint(dst, dst_stride, src_row, src_stride, w, h);
 346    else if (util_format_is_pure_uint(format))
 347       format_desc->unpack_rgba_uint(dst, dst_stride, src_row, src_stride, w, h);
 348    else
 349       format_desc->unpack_rgba_float(dst, dst_stride, src_row, src_stride, w, h);
 350 }
 351
 352
 353 void
 354 util_format_write_4(enum pipe_format format,
 355                      const void *src, unsigned src_stride,
 356                      void *dst, unsigned dst_stride,
 357                      unsigned x, unsigned y, unsigned w, unsigned h)
 358 {
 359    const struct util_format_description *format_desc;
 360    uint8_t *dst_row;
 361
 362    format_desc = util_format_description(format);
 363
 364    assert(x % format_desc->block.width == 0);
 365    assert(y % format_desc->block.height == 0);
 366
 367    dst_row = (uint8_t *)dst + y*dst_stride + x*(format_desc->block.bits/8);
 368
 369    if (util_format_is_pure_uint(format))
 370       format_desc->pack_rgba_uint(dst_row, dst_stride, src, src_stride, w, h);
 371    else if (util_format_is_pure_sint(format))
 372       format_desc->pack_rgba_sint(dst_row, dst_stride, src, src_stride, w, h);
 373    else
 374       format_desc->pack_rgba_float(dst_row, dst_stride, src, src_stride, w, h);
 375 }
 376
 377
 378 void
 379 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)
 380 {
 381    const struct util_format_description *format_desc;
 382    const uint8_t *src_row;
 383    uint8_t *dst_row;
 384
 385    format_desc = util_format_description(format);
 386
 387    assert(x % format_desc->block.width == 0);
 388    assert(y % format_desc->block.height == 0);
 389
 390    src_row = (const uint8_t *)src + y*src_stride + x*(format_desc->block.bits/8);
 391    dst_row = dst;
 392
 393    format_desc->unpack_rgba_8unorm(dst_row, dst_stride, src_row, src_stride, w, h);
 394 }
 395
 396
 397 void
 398 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)
 399 {
 400    const struct util_format_description *format_desc;
 401    uint8_t *dst_row;
 402    const uint8_t *src_row;
 403
 404    format_desc = util_format_description(format);
 405
 406    assert(x % format_desc->block.width == 0);
 407    assert(y % format_desc->block.height == 0);
 408
 409    dst_row = (uint8_t *)dst + y*dst_stride + x*(format_desc->block.bits/8);
 410    src_row = src;
 411
 412    format_desc->pack_rgba_8unorm(dst_row, dst_stride, src_row, src_stride, w, h);
 413 }
 414
 415 /**
 416  * Check if we can safely memcopy from the source format to the dest format.
 417  * This basically covers the cases of a "used" channel copied to a typeless
 418  * channel, plus some 1-channel cases.
 419  * Examples of compatible copy formats include:
 420  *    b8g8r8a8_unorm -> b8g8r8x8_unorm
 421  *    a8r8g8b8_unorm -> x8r8g8b8_unorm
 422  *    b5g5r5a1_unorm -> b5g5r5x1_unorm
 423  *    b4g4r4a4_unorm -> b4g4r4x4_unorm
 424  *    l8_unorm -> r8_unorm
 425  *    i8_unorm -> l8_unorm
 426  *    i8_unorm -> a8_unorm
 427  *    i8_unorm -> r8_unorm
 428  *    l16_unorm -> r16_unorm
 429  *    z24_unorm_s8_uint -> z24x8_unorm
 430  *    s8_uint_z24_unorm -> x8z24_unorm
 431  *    r8g8b8a8_unorm -> r8g8b8x8_unorm
 432  *    a8b8g8r8_srgb -> x8b8g8r8_srgb
 433  *    b8g8r8a8_srgb -> b8g8r8x8_srgb
 434  *    a8r8g8b8_srgb -> x8r8g8b8_srgb
 435  *    a8b8g8r8_unorm -> x8b8g8r8_unorm
 436  *    r10g10b10a2_uscaled -> r10g10b10x2_uscaled
 437  *    r10sg10sb10sa2u_norm -> r10g10b10x2_snorm
 438  */
 439 boolean
 440 util_is_format_compatible(const struct util_format_description *src_desc,
 441                           const struct util_format_description *dst_desc)
 442 {
 443    unsigned chan;
 444
 445    if (src_desc->format == dst_desc->format) {
 446       return TRUE;
 447    }
 448
 449    if (src_desc->layout != UTIL_FORMAT_LAYOUT_PLAIN ||
 450        dst_desc->layout != UTIL_FORMAT_LAYOUT_PLAIN) {
 451       return FALSE;
 452    }
 453
 454    if (src_desc->block.bits != dst_desc->block.bits ||
 455        src_desc->nr_channels != dst_desc->nr_channels ||
 456        src_desc->colorspace != dst_desc->colorspace) {
 457       return FALSE;
 458    }
 459
 460    for (chan = 0; chan < 4; ++chan) {
 461       if (src_desc->channel[chan].size !=
 462           dst_desc->channel[chan].size) {
 463          return FALSE;
 464       }
 465    }
 466
 467    for (chan = 0; chan < 4; ++chan) {
 468       enum pipe_swizzle swizzle = dst_desc->swizzle[chan];
 469
 470       if (swizzle < 4) {
 471          if (src_desc->swizzle[chan] != swizzle) {
 472             return FALSE;
 473          }
 474          if ((src_desc->channel[swizzle].type !=
 475               dst_desc->channel[swizzle].type) ||
 476              (src_desc->channel[swizzle].normalized !=
 477               dst_desc->channel[swizzle].normalized)) {
 478             return FALSE;
 479          }
 480       }
 481    }
 482
 483    return TRUE;
 484 }
 485
 486
 487 boolean
 488 util_format_fits_8unorm(const struct util_format_description *format_desc)
 489 {
 490    unsigned chan;
 491
 492    /*
 493     * After linearized sRGB values require more than 8bits.
 494     */
 495
 496    if (format_desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) {
 497       return FALSE;
 498    }
 499
 500    switch (format_desc->layout) {
 501
 502    case UTIL_FORMAT_LAYOUT_S3TC:
 503       /*
 504        * These are straight forward.
 505        */
 506       return TRUE;
 507    case UTIL_FORMAT_LAYOUT_RGTC:
 508       if (format_desc->format == PIPE_FORMAT_RGTC1_SNORM ||
 509           format_desc->format == PIPE_FORMAT_RGTC2_SNORM ||
 510           format_desc->format == PIPE_FORMAT_LATC1_SNORM ||
 511           format_desc->format == PIPE_FORMAT_LATC2_SNORM)
 512          return FALSE;
 513       return TRUE;
 514    case UTIL_FORMAT_LAYOUT_BPTC:
 515       if (format_desc->format == PIPE_FORMAT_BPTC_RGBA_UNORM)
 516          return TRUE;
 517       return FALSE;
 518
 519    case UTIL_FORMAT_LAYOUT_ETC:
 520       if (format_desc->format == PIPE_FORMAT_ETC1_RGB8)
 521          return TRUE;
 522       return FALSE;
 523
 524    case UTIL_FORMAT_LAYOUT_PLAIN:
 525       /*
 526        * For these we can find a generic rule.
 527        */
 528
 529       for (chan = 0; chan < format_desc->nr_channels; ++chan) {
 530          switch (format_desc->channel[chan].type) {
 531          case UTIL_FORMAT_TYPE_VOID:
 532             break;
 533          case UTIL_FORMAT_TYPE_UNSIGNED:
 534             if (!format_desc->channel[chan].normalized ||
 535                 format_desc->channel[chan].size > 8) {
 536                return FALSE;
 537             }
 538             break;
 539          default:
 540             return FALSE;
 541          }
 542       }
 543       return TRUE;
 544
 545    default:
 546       /*
 547        * Handle all others on a case by case basis.
 548        */
 549
 550       switch (format_desc->format) {
 551       case PIPE_FORMAT_R1_UNORM:
 552       case PIPE_FORMAT_UYVY:
 553       case PIPE_FORMAT_YUYV:
 554       case PIPE_FORMAT_R8G8_B8G8_UNORM:
 555       case PIPE_FORMAT_G8R8_G8B8_UNORM:
 556          return TRUE;
 557
 558       default:
 559          return FALSE;
 560       }
 561    }
 562 }
 563
 564
 565 boolean
 566 util_format_translate(enum pipe_format dst_format,
 567                       void *dst, unsigned dst_stride,
 568                       unsigned dst_x, unsigned dst_y,
 569                       enum pipe_format src_format,
 570                       const void *src, unsigned src_stride,
 571                       unsigned src_x, unsigned src_y,
 572                       unsigned width, unsigned height)
 573 {
 574    const struct util_format_description *dst_format_desc;
 575    const struct util_format_description *src_format_desc;
 576    uint8_t *dst_row;
 577    const uint8_t *src_row;
 578    unsigned x_step, y_step;
 579    unsigned dst_step;
 580    unsigned src_step;
 581
 582    dst_format_desc = util_format_description(dst_format);
 583    src_format_desc = util_format_description(src_format);
 584
 585    if (util_is_format_compatible(src_format_desc, dst_format_desc)) {
 586       /*
 587        * Trivial case.
 588        */
 589
 590       util_copy_rect(dst, dst_format, dst_stride,  dst_x, dst_y,
 591                      width, height, src, (int)src_stride,
 592                      src_x, src_y);
 593       return TRUE;
 594    }
 595
 596    assert(dst_x % dst_format_desc->block.width == 0);
 597    assert(dst_y % dst_format_desc->block.height == 0);
 598    assert(src_x % src_format_desc->block.width == 0);
 599    assert(src_y % src_format_desc->block.height == 0);
 600
 601    dst_row = (uint8_t *)dst + dst_y*dst_stride + dst_x*(dst_format_desc->block.bits/8);
 602    src_row = (const uint8_t *)src + src_y*src_stride + src_x*(src_format_desc->block.bits/8);
 603
 604    /*
 605     * This works because all pixel formats have pixel blocks with power of two
 606     * sizes.
 607     */
 608
 609    y_step = MAX2(dst_format_desc->block.height, src_format_desc->block.height);
 610    x_step = MAX2(dst_format_desc->block.width, src_format_desc->block.width);
 611    assert(y_step % dst_format_desc->block.height == 0);
 612    assert(y_step % src_format_desc->block.height == 0);
 613
 614    dst_step = y_step / dst_format_desc->block.height * dst_stride;
 615    src_step = y_step / src_format_desc->block.height * src_stride;
 616
 617    /*
 618     * TODO: double formats will loose precision
 619     * TODO: Add a special case for formats that are mere swizzles of each other
 620     */
 621
 622    if (src_format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS ||
 623        dst_format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS) {
 624       float *tmp_z = NULL;
 625       uint8_t *tmp_s = NULL;
 626
 627       assert(x_step == 1);
 628       assert(y_step == 1);
 629
 630       if (src_format_desc->unpack_z_float &&
 631           dst_format_desc->pack_z_float) {
 632          tmp_z = malloc(width * sizeof *tmp_z);
 633       }
 634
 635       if (src_format_desc->unpack_s_8uint &&
 636           dst_format_desc->pack_s_8uint) {
 637          tmp_s = malloc(width * sizeof *tmp_s);
 638       }
 639
 640       while (height--) {
 641          if (tmp_z) {
 642             util_format_unpack_z_float(src_format, tmp_z, src_row, width);
 643             util_format_pack_z_float(dst_format, dst_row, tmp_z, width);
 644          }
 645
 646          if (tmp_s) {
 647             util_format_unpack_s_8uint(src_format, tmp_s, src_row, width);
 648             util_format_pack_s_8uint(dst_format, dst_row, tmp_s, width);
 649          }
 650
 651          dst_row += dst_step;
 652          src_row += src_step;
 653       }
 654
 655       free(tmp_s);
 656
 657       free(tmp_z);
 658
 659       return TRUE;
 660    }
 661
 662    if (util_format_fits_8unorm(src_format_desc) ||
 663        util_format_fits_8unorm(dst_format_desc)) {
 664       unsigned tmp_stride;
 665       uint8_t *tmp_row;
 666
 667       if (!src_format_desc->unpack_rgba_8unorm ||
 668           !dst_format_desc->pack_rgba_8unorm) {
 669          return FALSE;
 670       }
 671
 672       tmp_stride = MAX2(width, x_step) * 4 * sizeof *tmp_row;
 673       tmp_row = malloc(y_step * tmp_stride);
 674       if (!tmp_row)
 675          return FALSE;
 676
 677       while (height >= y_step) {
 678          src_format_desc->unpack_rgba_8unorm(tmp_row, tmp_stride, src_row, src_stride, width, y_step);
 679          dst_format_desc->pack_rgba_8unorm(dst_row, dst_stride, tmp_row, tmp_stride, width, y_step);
 680
 681          dst_row += dst_step;
 682          src_row += src_step;
 683          height -= y_step;
 684       }
 685
 686       if (height) {
 687          src_format_desc->unpack_rgba_8unorm(tmp_row, tmp_stride, src_row, src_stride, width, height);
 688          dst_format_desc->pack_rgba_8unorm(dst_row, dst_stride, tmp_row, tmp_stride, width, height);
 689       }
 690
 691       free(tmp_row);
 692    }
 693    else if (util_format_is_pure_sint(src_format) ||
 694             util_format_is_pure_sint(dst_format)) {
 695       unsigned tmp_stride;
 696       int *tmp_row;
 697
 698       if (!src_format_desc->unpack_rgba_sint ||
 699           !dst_format_desc->pack_rgba_sint) {
 700          return FALSE;
 701       }
 702
 703       tmp_stride = MAX2(width, x_step) * 4 * sizeof *tmp_row;
 704       tmp_row = malloc(y_step * tmp_stride);
 705       if (!tmp_row)
 706          return FALSE;
 707
 708       while (height >= y_step) {
 709          src_format_desc->unpack_rgba_sint(tmp_row, tmp_stride, src_row, src_stride, width, y_step);
 710          dst_format_desc->pack_rgba_sint(dst_row, dst_stride, tmp_row, tmp_stride, width, y_step);
 711
 712          dst_row += dst_step;
 713          src_row += src_step;
 714          height -= y_step;
 715       }
 716
 717       if (height) {
 718          src_format_desc->unpack_rgba_sint(tmp_row, tmp_stride, src_row, src_stride, width, height);
 719          dst_format_desc->pack_rgba_sint(dst_row, dst_stride, tmp_row, tmp_stride, width, height);
 720       }
 721
 722       free(tmp_row);
 723    }
 724    else if (util_format_is_pure_uint(src_format) ||
 725             util_format_is_pure_uint(dst_format)) {
 726       unsigned tmp_stride;
 727       unsigned int *tmp_row;
 728
 729       if (!src_format_desc->unpack_rgba_uint ||
 730           !dst_format_desc->pack_rgba_uint) {
 731          return FALSE;
 732       }
 733
 734       tmp_stride = MAX2(width, x_step) * 4 * sizeof *tmp_row;
 735       tmp_row = malloc(y_step * tmp_stride);
 736       if (!tmp_row)
 737          return FALSE;
 738
 739       while (height >= y_step) {
 740          src_format_desc->unpack_rgba_uint(tmp_row, tmp_stride, src_row, src_stride, width, y_step);
 741          dst_format_desc->pack_rgba_uint(dst_row, dst_stride, tmp_row, tmp_stride, width, y_step);
 742
 743          dst_row += dst_step;
 744          src_row += src_step;
 745          height -= y_step;
 746       }
 747
 748       if (height) {
 749          src_format_desc->unpack_rgba_uint(tmp_row, tmp_stride, src_row, src_stride, width, height);
 750          dst_format_desc->pack_rgba_uint(dst_row, dst_stride, tmp_row, tmp_stride, width, height);
 751       }
 752
 753       free(tmp_row);
 754    }
 755    else {
 756       unsigned tmp_stride;
 757       float *tmp_row;
 758
 759       if (!src_format_desc->unpack_rgba_float ||
 760           !dst_format_desc->pack_rgba_float) {
 761          return FALSE;
 762       }
 763
 764       tmp_stride = MAX2(width, x_step) * 4 * sizeof *tmp_row;
 765       tmp_row = malloc(y_step * tmp_stride);
 766       if (!tmp_row)
 767          return FALSE;
 768
 769       while (height >= y_step) {
 770          src_format_desc->unpack_rgba_float(tmp_row, tmp_stride, src_row, src_stride, width, y_step);
 771          dst_format_desc->pack_rgba_float(dst_row, dst_stride, tmp_row, tmp_stride, width, y_step);
 772
 773          dst_row += dst_step;
 774          src_row += src_step;
 775          height -= y_step;
 776       }
 777
 778       if (height) {
 779          src_format_desc->unpack_rgba_float(tmp_row, tmp_stride, src_row, src_stride, width, height);
 780          dst_format_desc->pack_rgba_float(dst_row, dst_stride, tmp_row, tmp_stride, width, height);
 781       }
 782
 783       free(tmp_row);
 784    }
 785    return TRUE;
 786 }
 787
 788 boolean
 789 util_format_translate_3d(enum pipe_format dst_format,
 790                          void *dst, unsigned dst_stride,
 791                          unsigned dst_slice_stride,
 792                          unsigned dst_x, unsigned dst_y,
 793                          unsigned dst_z,
 794                          enum pipe_format src_format,
 795                          const void *src, unsigned src_stride,
 796                          unsigned src_slice_stride,
 797                          unsigned src_x, unsigned src_y,
 798                          unsigned src_z, unsigned width,
 799                          unsigned height, unsigned depth)
 800 {
 801    uint8_t *dst_layer;
 802    const uint8_t *src_layer;
 803    unsigned z;
 804    dst_layer = dst;
 805    src_layer = src;
 806    dst_layer += dst_z * dst_slice_stride;
 807    src_layer += src_z * src_slice_stride;
 808    for (z = 0; z < depth; ++z) {
 809       if (!util_format_translate(dst_format, dst_layer, dst_stride,
 810                                  dst_x, dst_y,
 811                                  src_format, src_layer, src_stride,
 812                                  src_x, src_y,
 813                                  width, height))
 814           return FALSE;
 815
 816       dst_layer += dst_slice_stride;
 817       src_layer += src_slice_stride;
 818    }
 819    return TRUE;
 820 }
 821
 822 void util_format_compose_swizzles(const unsigned char swz1[4],
 823                                   const unsigned char swz2[4],
 824                                   unsigned char dst[4])
 825 {
 826    unsigned i;
 827
 828    for (i = 0; i < 4; i++) {
 829       dst[i] = swz2[i] <= PIPE_SWIZZLE_W ?
 830                swz1[swz2[i]] : swz2[i];
 831    }
 832 }
 833
 834 void util_format_apply_color_swizzle(union pipe_color_union *dst,
 835                                      const union pipe_color_union *src,
 836                                      const unsigned char swz[4],
 837                                      const boolean is_integer)
 838 {
 839    unsigned c;
 840
 841    if (is_integer) {
 842       for (c = 0; c < 4; ++c) {
 843          switch (swz[c]) {
 844          case PIPE_SWIZZLE_X:   dst->ui[c] = src->ui[0]; break;
 845          case PIPE_SWIZZLE_Y: dst->ui[c] = src->ui[1]; break;
 846          case PIPE_SWIZZLE_Z:  dst->ui[c] = src->ui[2]; break;
 847          case PIPE_SWIZZLE_W: dst->ui[c] = src->ui[3]; break;
 848          default:
 849             dst->ui[c] = (swz[c] == PIPE_SWIZZLE_1) ? 1 : 0;
 850             break;
 851          }
 852       }
 853    } else {
 854       for (c = 0; c < 4; ++c) {
 855          switch (swz[c]) {
 856          case PIPE_SWIZZLE_X:   dst->f[c] = src->f[0]; break;
 857          case PIPE_SWIZZLE_Y: dst->f[c] = src->f[1]; break;
 858          case PIPE_SWIZZLE_Z:  dst->f[c] = src->f[2]; break;
 859          case PIPE_SWIZZLE_W: dst->f[c] = src->f[3]; break;
 860          default:
 861             dst->f[c] = (swz[c] == PIPE_SWIZZLE_1) ? 1.0f : 0.0f;
 862             break;
 863          }
 864       }
 865    }
 866 }
 867
 868 void pipe_swizzle_4f(float *dst, const float *src,
 869                             const unsigned char swz[4])
 870 {
 871    unsigned i;
 872
 873    for (i = 0; i < 4; i++) {
 874       if (swz[i] <= PIPE_SWIZZLE_W)
 875          dst[i] = src[swz[i]];
 876       else if (swz[i] == PIPE_SWIZZLE_0)
 877          dst[i] = 0;
 878       else if (swz[i] == PIPE_SWIZZLE_1)
 879          dst[i] = 1;
 880    }
 881 }
 882
 883 void util_format_unswizzle_4f(float *dst, const float *src,
 884                               const unsigned char swz[4])
 885 {
 886    unsigned i;
 887
 888    for (i = 0; i < 4; i++) {
 889       switch (swz[i]) {
 890       case PIPE_SWIZZLE_X:
 891          dst[0] = src[i];
 892          break;
 893       case PIPE_SWIZZLE_Y:
 894          dst[1] = src[i];
 895          break;
 896       case PIPE_SWIZZLE_Z:
 897          dst[2] = src[i];
 898          break;
 899       case PIPE_SWIZZLE_W:
 900          dst[3] = src[i];
 901          break;
 902       }
 903    }
 904 }
 905
 906 enum pipe_format
 907 util_format_snorm8_to_sint8(enum pipe_format format)
 908 {
 909    switch (format) {
 910    case PIPE_FORMAT_R8_SNORM:
 911       return PIPE_FORMAT_R8_SINT;
 912    case PIPE_FORMAT_R8G8_SNORM:
 913       return PIPE_FORMAT_R8G8_SINT;
 914    case PIPE_FORMAT_R8G8B8_SNORM:
 915       return PIPE_FORMAT_R8G8B8_SINT;
 916    case PIPE_FORMAT_R8G8B8A8_SNORM:
 917       return PIPE_FORMAT_R8G8B8A8_SINT;
 918
 919    case PIPE_FORMAT_A8_SNORM:
 920       return PIPE_FORMAT_A8_SINT;
 921    case PIPE_FORMAT_L8_SNORM:
 922       return PIPE_FORMAT_L8_SINT;
 923    case PIPE_FORMAT_L8A8_SNORM:
 924       return PIPE_FORMAT_L8A8_SINT;
 925    case PIPE_FORMAT_I8_SNORM:
 926       return PIPE_FORMAT_I8_SINT;
 927
 928    case PIPE_FORMAT_R8G8B8X8_SNORM:
 929       return PIPE_FORMAT_R8G8B8X8_SINT;
 930    case PIPE_FORMAT_R8A8_SNORM:
 931       return PIPE_FORMAT_R8A8_SINT;
 932    case PIPE_FORMAT_G8R8_SNORM:
 933       return PIPE_FORMAT_G8R8_SINT;
 934    case PIPE_FORMAT_A8B8G8R8_SNORM:
 935       return PIPE_FORMAT_A8B8G8R8_SINT;
 936    case PIPE_FORMAT_X8B8G8R8_SNORM:
 937       return PIPE_FORMAT_X8B8G8R8_SINT;
 938
 939    default:
 940       return format;
 941    }
 942 }