src/gallium/auxiliary/util/u_format.c

   1 /**************************************************************************
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   3  * Copyright 2010 VMware, Inc.
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  11  * permit persons to whom the Software is furnished to do so, subject to
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  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
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  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_rect.h"
  38 #include "u_format.h"
  39
  40
  41 void
  42 util_format_read_4f(enum pipe_format format,
  43                     float *dst, unsigned dst_stride,
  44                     const void *src, unsigned src_stride,
  45                     unsigned x, unsigned y, unsigned w, unsigned h)
  46 {
  47    const struct util_format_description *format_desc;
  48    const uint8_t *src_row;
  49    float *dst_row;
  50
  51    format_desc = util_format_description(format);
  52
  53    assert(x % format_desc->block.width == 0);
  54    assert(y % format_desc->block.height == 0);
  55
  56    src_row = (const uint8_t *)src + y*src_stride + x*(format_desc->block.bits/8);
  57    dst_row = dst;
  58
  59    format_desc->unpack_float(dst_row, dst_stride, src_row, src_stride, w, h);
  60 }
  61
  62
  63 void
  64 util_format_write_4f(enum pipe_format format,
  65                      const float *src, unsigned src_stride,
  66                      void *dst, unsigned dst_stride,
  67                      unsigned x, unsigned y, unsigned w, unsigned h)
  68 {
  69    const struct util_format_description *format_desc;
  70    uint8_t *dst_row;
  71    const float *src_row;
  72
  73    format_desc = util_format_description(format);
  74
  75    assert(x % format_desc->block.width == 0);
  76    assert(y % format_desc->block.height == 0);
  77
  78    dst_row = (uint8_t *)dst + y*dst_stride + x*(format_desc->block.bits/8);
  79    src_row = src;
  80
  81    format_desc->pack_float(dst_row, dst_stride, src_row, src_stride, w, h);
  82 }
  83
  84
  85 void
  86 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)
  87 {
  88    const struct util_format_description *format_desc;
  89    const uint8_t *src_row;
  90    uint8_t *dst_row;
  91
  92    format_desc = util_format_description(format);
  93
  94    assert(x % format_desc->block.width == 0);
  95    assert(y % format_desc->block.height == 0);
  96
  97    src_row = (const uint8_t *)src + y*src_stride + x*(format_desc->block.bits/8);
  98    dst_row = dst;
  99
 100    format_desc->unpack_8unorm(dst_row, dst_stride, src_row, src_stride, w, h);
 101 }
 102
 103
 104 void
 105 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)
 106 {
 107    const struct util_format_description *format_desc;
 108    uint8_t *dst_row;
 109    const uint8_t *src_row;
 110
 111    format_desc = util_format_description(format);
 112
 113    assert(x % format_desc->block.width == 0);
 114    assert(y % format_desc->block.height == 0);
 115
 116    dst_row = (uint8_t *)dst + y*dst_stride + x*(format_desc->block.bits/8);
 117    src_row = src;
 118
 119    format_desc->pack_8unorm(dst_row, dst_stride, src_row, src_stride, w, h);
 120 }
 121
 122
 123 static INLINE boolean
 124 util_format_fits_8unorm(const struct util_format_description *format_desc)
 125 {
 126    unsigned chan;
 127
 128    switch (format_desc->layout) {
 129
 130    case UTIL_FORMAT_LAYOUT_S3TC:
 131    case UTIL_FORMAT_LAYOUT_RGTC:
 132       /*
 133        * These are straight forward.
 134        */
 135
 136       return TRUE;
 137
 138    case UTIL_FORMAT_LAYOUT_PLAIN:
 139       /*
 140        * For these we can find a generic rule.
 141        */
 142
 143       for (chan = 0; chan < format_desc->nr_channels; ++chan) {
 144          switch (format_desc->channel[chan].type) {
 145          case UTIL_FORMAT_TYPE_VOID:
 146             break;
 147          case UTIL_FORMAT_TYPE_UNSIGNED:
 148             if (!format_desc->channel[chan].normalized ||
 149                 format_desc->channel[chan].size > 8) {
 150                return FALSE;
 151             }
 152          default:
 153             return FALSE;
 154          }
 155       }
 156       return TRUE;
 157
 158    default:
 159       /*
 160        * Handle all others on a case by case basis.
 161        */
 162
 163       switch (format_desc->format) {
 164       case PIPE_FORMAT_R1_UNORM:
 165       case PIPE_FORMAT_UYVY:
 166       case PIPE_FORMAT_YUYV:
 167       case PIPE_FORMAT_R8G8_B8G8_UNORM:
 168       case PIPE_FORMAT_G8R8_G8B8_UNORM:
 169          return TRUE;
 170
 171       default:
 172          return FALSE;
 173       }
 174    }
 175 }
 176
 177
 178 void
 179 util_format_translate(enum pipe_format dst_format,
 180                       void *dst, unsigned dst_stride,
 181                       unsigned dst_x, unsigned dst_y,
 182                       enum pipe_format src_format,
 183                       const void *src, unsigned src_stride,
 184                       unsigned src_x, unsigned src_y,
 185                       unsigned width, unsigned height)
 186 {
 187    const struct util_format_description *dst_format_desc;
 188    const struct util_format_description *src_format_desc;
 189    uint8_t *dst_row;
 190    const uint8_t *src_row;
 191    unsigned y_step;
 192    unsigned dst_step;
 193    unsigned src_step;
 194
 195    if (dst_format == src_format) {
 196       /*
 197        * Trivial case.
 198        */
 199
 200       util_copy_rect(dst, dst_format, dst_stride,  dst_x, dst_y,
 201                      width, height, src, (int)src_stride,
 202                      src_x, src_y);
 203       return;
 204    }
 205
 206    dst_format_desc = util_format_description(dst_format);
 207    src_format_desc = util_format_description(src_format);
 208
 209    assert(dst_x % dst_format_desc->block.width == 0);
 210    assert(dst_y % dst_format_desc->block.height == 0);
 211    assert(src_x % src_format_desc->block.width == 0);
 212    assert(src_y % src_format_desc->block.height == 0);
 213
 214    dst_row = (uint8_t *)dst + dst_y*dst_stride + dst_x*(dst_format_desc->block.bits/8);
 215    src_row = (const uint8_t *)src + src_y*src_stride + src_x*(src_format_desc->block.bits/8);
 216
 217    /*
 218     * This works because all pixel formats have pixel blocks with power of two
 219     * sizes.
 220     */
 221
 222    y_step = MAX2(dst_format_desc->block.height, src_format_desc->block.height);
 223    assert(y_step % dst_format_desc->block.height == 0);
 224    assert(y_step % src_format_desc->block.height == 0);
 225
 226    dst_step = y_step / dst_format_desc->block.height * dst_stride;
 227    src_step = y_step / src_format_desc->block.height * src_stride;
 228
 229    /*
 230     * TODO: double formats will loose precision
 231     * TODO: Add a special case for formats that are mere swizzles of each other
 232     */
 233
 234    if (util_format_fits_8unorm(src_format_desc) ||
 235        util_format_fits_8unorm(dst_format_desc)) {
 236       unsigned tmp_stride;
 237       uint8_t *tmp_row;
 238
 239       tmp_stride = width * 4 * sizeof *tmp_row;
 240       tmp_row = MALLOC(y_step * tmp_stride);
 241       if (!tmp_row)
 242          return;
 243
 244       while (height >= y_step) {
 245          src_format_desc->unpack_8unorm(tmp_row, tmp_stride, src_row, src_stride, width, y_step);
 246          dst_format_desc->pack_8unorm(dst_row, dst_stride, tmp_row, tmp_stride, width, y_step);
 247
 248          dst_row += dst_step;
 249          src_row += src_step;
 250          height -= y_step;
 251       }
 252
 253       if (height) {
 254          src_format_desc->unpack_8unorm(tmp_row, tmp_stride, src_row, src_stride, width, height);
 255          dst_format_desc->pack_8unorm(dst_row, dst_stride, tmp_row, tmp_stride, width, height);
 256       }
 257
 258       FREE(tmp_row);
 259    }
 260    else {
 261       unsigned tmp_stride;
 262       float *tmp_row;
 263
 264       tmp_stride = width * 4 * sizeof *tmp_row;
 265       tmp_row = MALLOC(y_step * tmp_stride);
 266       if (!tmp_row)
 267          return;
 268
 269       while (height >= y_step) {
 270          src_format_desc->unpack_float(tmp_row, tmp_stride, src_row, src_stride, width, y_step);
 271          dst_format_desc->pack_float(dst_row, dst_stride, tmp_row, tmp_stride, width, y_step);
 272
 273          dst_row += dst_step;
 274          src_row += src_step;
 275          height -= y_step;
 276       }
 277
 278       if (height) {
 279          src_format_desc->unpack_float(tmp_row, tmp_stride, src_row, src_stride, width, height);
 280          dst_format_desc->pack_float(dst_row, dst_stride, tmp_row, tmp_stride, width, height);
 281       }
 282
 283       FREE(tmp_row);
 284    }
 285 }