libswscale/rgb2rgb.c

   1 /*
   2  *  rgb2rgb.c, Software RGB to RGB convertor
   3  *  pluralize by Software PAL8 to RGB convertor
   4  *               Software YUV to YUV convertor
   5  *               Software YUV to RGB convertor
   6  *  Written by Nick Kurshev.
   7  *  palette & YUV & runtime CPU stuff by Michael (michaelni@gmx.at)
   8  *
   9  * This file is part of FFmpeg.
  10  *
  11  * FFmpeg is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * FFmpeg is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with FFmpeg; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  24  *
  25  * the C code (not assembly, mmx, ...) of this file can be used
  26  * under the LGPL license too
  27  */
  28 #include <inttypes.h>
  29 #include "config.h"
  30 #include "libavutil/x86_cpu.h"
  31 #include "libavutil/bswap.h"
  32 #include "rgb2rgb.h"
  33 #include "swscale.h"
  34 #include "swscale_internal.h"
  35
  36 #define FAST_BGR2YV12 // use 7 bit coeffs instead of 15bit
  37
  38 void (*rgb24to32)(const uint8_t *src, uint8_t *dst, long src_size);
  39 void (*rgb24to16)(const uint8_t *src, uint8_t *dst, long src_size);
  40 void (*rgb24to15)(const uint8_t *src, uint8_t *dst, long src_size);
  41 void (*rgb32to24)(const uint8_t *src, uint8_t *dst, long src_size);
  42 void (*rgb32to16)(const uint8_t *src, uint8_t *dst, long src_size);
  43 void (*rgb32to15)(const uint8_t *src, uint8_t *dst, long src_size);
  44 void (*rgb15to16)(const uint8_t *src, uint8_t *dst, long src_size);
  45 void (*rgb15to24)(const uint8_t *src, uint8_t *dst, long src_size);
  46 void (*rgb15to32)(const uint8_t *src, uint8_t *dst, long src_size);
  47 void (*rgb16to15)(const uint8_t *src, uint8_t *dst, long src_size);
  48 void (*rgb16to24)(const uint8_t *src, uint8_t *dst, long src_size);
  49 void (*rgb16to32)(const uint8_t *src, uint8_t *dst, long src_size);
  50 //void (*rgb24tobgr32)(const uint8_t *src, uint8_t *dst, long src_size);
  51 void (*rgb24tobgr24)(const uint8_t *src, uint8_t *dst, long src_size);
  52 void (*rgb24tobgr16)(const uint8_t *src, uint8_t *dst, long src_size);
  53 void (*rgb24tobgr15)(const uint8_t *src, uint8_t *dst, long src_size);
  54 void (*rgb32tobgr32)(const uint8_t *src, uint8_t *dst, long src_size);
  55 //void (*rgb32tobgr24)(const uint8_t *src, uint8_t *dst, long src_size);
  56 void (*rgb32tobgr16)(const uint8_t *src, uint8_t *dst, long src_size);
  57 void (*rgb32tobgr15)(const uint8_t *src, uint8_t *dst, long src_size);
  58
  59 void (*yv12toyuy2)(const uint8_t *ysrc, const uint8_t *usrc, const uint8_t *vsrc, uint8_t *dst,
  60                    long width, long height,
  61                    long lumStride, long chromStride, long dstStride);
  62 void (*yv12touyvy)(const uint8_t *ysrc, const uint8_t *usrc, const uint8_t *vsrc, uint8_t *dst,
  63                    long width, long height,
  64                    long lumStride, long chromStride, long dstStride);
  65 void (*yuv422ptoyuy2)(const uint8_t *ysrc, const uint8_t *usrc, const uint8_t *vsrc, uint8_t *dst,
  66                       long width, long height,
  67                       long lumStride, long chromStride, long dstStride);
  68 void (*yuy2toyv12)(const uint8_t *src, uint8_t *ydst, uint8_t *udst, uint8_t *vdst,
  69                    long width, long height,
  70                    long lumStride, long chromStride, long srcStride);
  71 void (*rgb24toyv12)(const uint8_t *src, uint8_t *ydst, uint8_t *udst, uint8_t *vdst,
  72                     long width, long height,
  73                     long lumStride, long chromStride, long srcStride);
  74 void (*planar2x)(const uint8_t *src, uint8_t *dst, long width, long height,
  75                  long srcStride, long dstStride);
  76 void (*interleaveBytes)(uint8_t *src1, uint8_t *src2, uint8_t *dst,
  77                         long width, long height, long src1Stride,
  78                         long src2Stride, long dstStride);
  79 void (*vu9_to_vu12)(const uint8_t *src1, const uint8_t *src2,
  80                     uint8_t *dst1, uint8_t *dst2,
  81                     long width, long height,
  82                     long srcStride1, long srcStride2,
  83                     long dstStride1, long dstStride2);
  84 void (*yvu9_to_yuy2)(const uint8_t *src1, const uint8_t *src2, const uint8_t *src3,
  85                      uint8_t *dst,
  86                      long width, long height,
  87                      long srcStride1, long srcStride2,
  88                      long srcStride3, long dstStride);
  89
  90 #if defined(ARCH_X86) && defined(CONFIG_GPL)
  91 DECLARE_ASM_CONST(8, uint64_t, mmx_null)     = 0x0000000000000000ULL;
  92 DECLARE_ASM_CONST(8, uint64_t, mmx_one)      = 0xFFFFFFFFFFFFFFFFULL;
  93 DECLARE_ASM_CONST(8, uint64_t, mask32b)      = 0x000000FF000000FFULL;
  94 DECLARE_ASM_CONST(8, uint64_t, mask32g)      = 0x0000FF000000FF00ULL;
  95 DECLARE_ASM_CONST(8, uint64_t, mask32r)      = 0x00FF000000FF0000ULL;
  96 DECLARE_ASM_CONST(8, uint64_t, mask32)       = 0x00FFFFFF00FFFFFFULL;
  97 DECLARE_ASM_CONST(8, uint64_t, mask3216br)   = 0x00F800F800F800F8ULL;
  98 DECLARE_ASM_CONST(8, uint64_t, mask3216g)    = 0x0000FC000000FC00ULL;
  99 DECLARE_ASM_CONST(8, uint64_t, mask3215g)    = 0x0000F8000000F800ULL;
 100 DECLARE_ASM_CONST(8, uint64_t, mul3216)      = 0x2000000420000004ULL;
 101 DECLARE_ASM_CONST(8, uint64_t, mul3215)      = 0x2000000820000008ULL;
 102 DECLARE_ASM_CONST(8, uint64_t, mask24b)      = 0x00FF0000FF0000FFULL;
 103 DECLARE_ASM_CONST(8, uint64_t, mask24g)      = 0xFF0000FF0000FF00ULL;
 104 DECLARE_ASM_CONST(8, uint64_t, mask24r)      = 0x0000FF0000FF0000ULL;
 105 DECLARE_ASM_CONST(8, uint64_t, mask24l)      = 0x0000000000FFFFFFULL;
 106 DECLARE_ASM_CONST(8, uint64_t, mask24h)      = 0x0000FFFFFF000000ULL;
 107 DECLARE_ASM_CONST(8, uint64_t, mask24hh)     = 0xffff000000000000ULL;
 108 DECLARE_ASM_CONST(8, uint64_t, mask24hhh)    = 0xffffffff00000000ULL;
 109 DECLARE_ASM_CONST(8, uint64_t, mask24hhhh)   = 0xffffffffffff0000ULL;
 110 DECLARE_ASM_CONST(8, uint64_t, mask15b)      = 0x001F001F001F001FULL; /* 00000000 00011111  xxB */
 111 DECLARE_ASM_CONST(8, uint64_t, mask15rg)     = 0x7FE07FE07FE07FE0ULL; /* 01111111 11100000  RGx */
 112 DECLARE_ASM_CONST(8, uint64_t, mask15s)      = 0xFFE0FFE0FFE0FFE0ULL;
 113 DECLARE_ASM_CONST(8, uint64_t, mask15g)      = 0x03E003E003E003E0ULL;
 114 DECLARE_ASM_CONST(8, uint64_t, mask15r)      = 0x7C007C007C007C00ULL;
 115 #define mask16b mask15b
 116 DECLARE_ASM_CONST(8, uint64_t, mask16g)      = 0x07E007E007E007E0ULL;
 117 DECLARE_ASM_CONST(8, uint64_t, mask16r)      = 0xF800F800F800F800ULL;
 118 DECLARE_ASM_CONST(8, uint64_t, red_16mask)   = 0x0000f8000000f800ULL;
 119 DECLARE_ASM_CONST(8, uint64_t, green_16mask) = 0x000007e0000007e0ULL;
 120 DECLARE_ASM_CONST(8, uint64_t, blue_16mask)  = 0x0000001f0000001fULL;
 121 DECLARE_ASM_CONST(8, uint64_t, red_15mask)   = 0x00007c0000007c00ULL;
 122 DECLARE_ASM_CONST(8, uint64_t, green_15mask) = 0x000003e0000003e0ULL;
 123 DECLARE_ASM_CONST(8, uint64_t, blue_15mask)  = 0x0000001f0000001fULL;
 124
 125 #if 0
 126 static volatile uint64_t __attribute__((aligned(8))) b5Dither;
 127 static volatile uint64_t __attribute__((aligned(8))) g5Dither;
 128 static volatile uint64_t __attribute__((aligned(8))) g6Dither;
 129 static volatile uint64_t __attribute__((aligned(8))) r5Dither;
 130
 131 static uint64_t __attribute__((aligned(8))) dither4[2]={
 132     0x0103010301030103LL,
 133     0x0200020002000200LL,};
 134
 135 static uint64_t __attribute__((aligned(8))) dither8[2]={
 136     0x0602060206020602LL,
 137     0x0004000400040004LL,};
 138 #endif
 139 #endif /* defined(ARCH_X86) */
 140
 141 #define RGB2YUV_SHIFT 8
 142 #define BY ((int)( 0.098*(1<<RGB2YUV_SHIFT)+0.5))
 143 #define BV ((int)(-0.071*(1<<RGB2YUV_SHIFT)+0.5))
 144 #define BU ((int)( 0.439*(1<<RGB2YUV_SHIFT)+0.5))
 145 #define GY ((int)( 0.504*(1<<RGB2YUV_SHIFT)+0.5))
 146 #define GV ((int)(-0.368*(1<<RGB2YUV_SHIFT)+0.5))
 147 #define GU ((int)(-0.291*(1<<RGB2YUV_SHIFT)+0.5))
 148 #define RY ((int)( 0.257*(1<<RGB2YUV_SHIFT)+0.5))
 149 #define RV ((int)( 0.439*(1<<RGB2YUV_SHIFT)+0.5))
 150 #define RU ((int)(-0.148*(1<<RGB2YUV_SHIFT)+0.5))
 151
 152 //Note: we have C, MMX, MMX2, 3DNOW version therse no 3DNOW+MMX2 one
 153 //Plain C versions
 154 #undef HAVE_MMX
 155 #undef HAVE_MMX2
 156 #undef HAVE_3DNOW
 157 #undef HAVE_SSE2
 158 #define RENAME(a) a ## _C
 159 #include "rgb2rgb_template.c"
 160
 161 #if defined(ARCH_X86) && defined(CONFIG_GPL)
 162
 163 //MMX versions
 164 #undef RENAME
 165 #define HAVE_MMX
 166 #undef HAVE_MMX2
 167 #undef HAVE_3DNOW
 168 #undef HAVE_SSE2
 169 #define RENAME(a) a ## _MMX
 170 #include "rgb2rgb_template.c"
 171
 172 //MMX2 versions
 173 #undef RENAME
 174 #define HAVE_MMX
 175 #define HAVE_MMX2
 176 #undef HAVE_3DNOW
 177 #undef HAVE_SSE2
 178 #define RENAME(a) a ## _MMX2
 179 #include "rgb2rgb_template.c"
 180
 181 //3DNOW versions
 182 #undef RENAME
 183 #define HAVE_MMX
 184 #undef HAVE_MMX2
 185 #define HAVE_3DNOW
 186 #undef HAVE_SSE2
 187 #define RENAME(a) a ## _3DNOW
 188 #include "rgb2rgb_template.c"
 189
 190 #endif //ARCH_X86 || ARCH_X86_64
 191
 192 /*
 193  rgb15->rgb16 Original by Strepto/Astral
 194  ported to gcc & bugfixed : A'rpi
 195  MMX2, 3DNOW optimization by Nick Kurshev
 196  32bit c version, and and&add trick by Michael Niedermayer
 197 */
 198
 199 void sws_rgb2rgb_init(int flags){
 200 #if (defined(HAVE_MMX2) || defined(HAVE_3DNOW) || defined(HAVE_MMX))  && defined(CONFIG_GPL)
 201     if (flags & SWS_CPU_CAPS_MMX2)
 202         rgb2rgb_init_MMX2();
 203     else if (flags & SWS_CPU_CAPS_3DNOW)
 204         rgb2rgb_init_3DNOW();
 205     else if (flags & SWS_CPU_CAPS_MMX)
 206         rgb2rgb_init_MMX();
 207     else
 208 #endif /* defined(HAVE_MMX2) || defined(HAVE_3DNOW) || defined(HAVE_MMX) */
 209         rgb2rgb_init_C();
 210 }
 211
 212 /**
 213  * Palette is assumed to contain BGR32.
 214  */
 215 void palette8torgb32(const uint8_t *src, uint8_t *dst, long num_pixels, const uint8_t *palette)
 216 {
 217     long i;
 218
 219 /*
 220     for (i=0; i<num_pixels; i++)
 221         ((unsigned *)dst)[i] = ((unsigned *)palette)[src[i]];
 222 */
 223
 224     for (i=0; i<num_pixels; i++)
 225     {
 226         #ifdef WORDS_BIGENDIAN
 227             dst[3]= palette[src[i]*4+2];
 228             dst[2]= palette[src[i]*4+1];
 229             dst[1]= palette[src[i]*4+0];
 230         #else
 231         //FIXME slow?
 232             dst[0]= palette[src[i]*4+2];
 233             dst[1]= palette[src[i]*4+1];
 234             dst[2]= palette[src[i]*4+0];
 235             //dst[3]= 0; /* do we need this cleansing? */
 236         #endif
 237         dst+= 4;
 238     }
 239 }
 240
 241 void palette8tobgr32(const uint8_t *src, uint8_t *dst, long num_pixels, const uint8_t *palette)
 242 {
 243     long i;
 244     for (i=0; i<num_pixels; i++)
 245     {
 246         #ifdef WORDS_BIGENDIAN
 247             dst[3]= palette[src[i]*4+0];
 248             dst[2]= palette[src[i]*4+1];
 249             dst[1]= palette[src[i]*4+2];
 250         #else
 251             //FIXME slow?
 252             dst[0]= palette[src[i]*4+0];
 253             dst[1]= palette[src[i]*4+1];
 254             dst[2]= palette[src[i]*4+2];
 255             //dst[3]= 0; /* do we need this cleansing? */
 256         #endif
 257
 258         dst+= 4;
 259     }
 260 }
 261
 262 /**
 263  * Palette is assumed to contain BGR32.
 264  */
 265 void palette8torgb24(const uint8_t *src, uint8_t *dst, long num_pixels, const uint8_t *palette)
 266 {
 267     long i;
 268 /*
 269     writes 1 byte o much and might cause alignment issues on some architectures?
 270     for (i=0; i<num_pixels; i++)
 271         ((unsigned *)(&dst[i*3])) = ((unsigned *)palette)[src[i]];
 272 */
 273     for (i=0; i<num_pixels; i++)
 274     {
 275         //FIXME slow?
 276         dst[0]= palette[src[i]*4+2];
 277         dst[1]= palette[src[i]*4+1];
 278         dst[2]= palette[src[i]*4+0];
 279         dst+= 3;
 280     }
 281 }
 282
 283 void palette8tobgr24(const uint8_t *src, uint8_t *dst, long num_pixels, const uint8_t *palette)
 284 {
 285     long i;
 286 /*
 287     writes 1 byte o much and might cause alignment issues on some architectures?
 288     for (i=0; i<num_pixels; i++)
 289         ((unsigned *)(&dst[i*3])) = ((unsigned *)palette)[src[i]];
 290 */
 291     for (i=0; i<num_pixels; i++)
 292     {
 293         //FIXME slow?
 294         dst[0]= palette[src[i]*4+0];
 295         dst[1]= palette[src[i]*4+1];
 296         dst[2]= palette[src[i]*4+2];
 297         dst+= 3;
 298     }
 299 }
 300
 301 /**
 302  * Palette is assumed to contain bgr16, see rgb32to16 to convert the palette
 303  */
 304 void palette8torgb16(const uint8_t *src, uint8_t *dst, long num_pixels, const uint8_t *palette)
 305 {
 306     long i;
 307     for (i=0; i<num_pixels; i++)
 308         ((uint16_t *)dst)[i] = ((uint16_t *)palette)[src[i]];
 309 }
 310 void palette8tobgr16(const uint8_t *src, uint8_t *dst, long num_pixels, const uint8_t *palette)
 311 {
 312     long i;
 313     for (i=0; i<num_pixels; i++)
 314         ((uint16_t *)dst)[i] = bswap_16(((uint16_t *)palette)[src[i]]);
 315 }
 316
 317 /**
 318  * Palette is assumed to contain BGR15, see rgb32to15 to convert the palette.
 319  */
 320 void palette8torgb15(const uint8_t *src, uint8_t *dst, long num_pixels, const uint8_t *palette)
 321 {
 322     long i;
 323     for (i=0; i<num_pixels; i++)
 324         ((uint16_t *)dst)[i] = ((uint16_t *)palette)[src[i]];
 325 }
 326 void palette8tobgr15(const uint8_t *src, uint8_t *dst, long num_pixels, const uint8_t *palette)
 327 {
 328     long i;
 329     for (i=0; i<num_pixels; i++)
 330         ((uint16_t *)dst)[i] = bswap_16(((uint16_t *)palette)[src[i]]);
 331 }
 332
 333 void rgb32tobgr24(const uint8_t *src, uint8_t *dst, long src_size)
 334 {
 335     long i;
 336     long num_pixels = src_size >> 2;
 337     for (i=0; i<num_pixels; i++)
 338     {
 339         #ifdef WORDS_BIGENDIAN
 340             /* RGB32 (= A,B,G,R) -> BGR24 (= B,G,R) */
 341             dst[3*i + 0] = src[4*i + 1];
 342             dst[3*i + 1] = src[4*i + 2];
 343             dst[3*i + 2] = src[4*i + 3];
 344         #else
 345             dst[3*i + 0] = src[4*i + 2];
 346             dst[3*i + 1] = src[4*i + 1];
 347             dst[3*i + 2] = src[4*i + 0];
 348         #endif
 349     }
 350 }
 351
 352 void rgb24tobgr32(const uint8_t *src, uint8_t *dst, long src_size)
 353 {
 354     long i;
 355     for (i=0; 3*i<src_size; i++)
 356     {
 357         #ifdef WORDS_BIGENDIAN
 358             /* RGB24 (= R,G,B) -> BGR32 (= A,R,G,B) */
 359             dst[4*i + 0] = 0;
 360             dst[4*i + 1] = src[3*i + 0];
 361             dst[4*i + 2] = src[3*i + 1];
 362             dst[4*i + 3] = src[3*i + 2];
 363         #else
 364             dst[4*i + 0] = src[3*i + 2];
 365             dst[4*i + 1] = src[3*i + 1];
 366             dst[4*i + 2] = src[3*i + 0];
 367             dst[4*i + 3] = 0;
 368         #endif
 369     }
 370 }
 371
 372 void rgb16tobgr32(const uint8_t *src, uint8_t *dst, long src_size)
 373 {
 374     const uint16_t *end;
 375     uint8_t *d = (uint8_t *)dst;
 376     const uint16_t *s = (uint16_t *)src;
 377     end = s + src_size/2;
 378     while (s < end)
 379     {
 380         register uint16_t bgr;
 381         bgr = *s++;
 382         #ifdef WORDS_BIGENDIAN
 383             *d++ = 0;
 384             *d++ = (bgr&0x1F)<<3;
 385             *d++ = (bgr&0x7E0)>>3;
 386             *d++ = (bgr&0xF800)>>8;
 387         #else
 388             *d++ = (bgr&0xF800)>>8;
 389             *d++ = (bgr&0x7E0)>>3;
 390             *d++ = (bgr&0x1F)<<3;
 391             *d++ = 0;
 392         #endif
 393     }
 394 }
 395
 396 void rgb16tobgr24(const uint8_t *src, uint8_t *dst, long src_size)
 397 {
 398     const uint16_t *end;
 399     uint8_t *d = (uint8_t *)dst;
 400     const uint16_t *s = (const uint16_t *)src;
 401     end = s + src_size/2;
 402     while (s < end)
 403     {
 404         register uint16_t bgr;
 405         bgr = *s++;
 406         *d++ = (bgr&0xF800)>>8;
 407         *d++ = (bgr&0x7E0)>>3;
 408         *d++ = (bgr&0x1F)<<3;
 409     }
 410 }
 411
 412 void rgb16tobgr16(const uint8_t *src, uint8_t *dst, long src_size)
 413 {
 414     long i;
 415     long num_pixels = src_size >> 1;
 416
 417     for (i=0; i<num_pixels; i++)
 418     {
 419         unsigned b,g,r;
 420         register uint16_t rgb;
 421         rgb = src[2*i];
 422         r = rgb&0x1F;
 423         g = (rgb&0x7E0)>>5;
 424         b = (rgb&0xF800)>>11;
 425         dst[2*i] = (b&0x1F) | ((g&0x3F)<<5) | ((r&0x1F)<<11);
 426     }
 427 }
 428
 429 void rgb16tobgr15(const uint8_t *src, uint8_t *dst, long src_size)
 430 {
 431     long i;
 432     long num_pixels = src_size >> 1;
 433
 434     for (i=0; i<num_pixels; i++)
 435     {
 436         unsigned b,g,r;
 437         register uint16_t rgb;
 438         rgb = src[2*i];
 439         r = rgb&0x1F;
 440         g = (rgb&0x7E0)>>5;
 441         b = (rgb&0xF800)>>11;
 442         dst[2*i] = (b&0x1F) | ((g&0x1F)<<5) | ((r&0x1F)<<10);
 443     }
 444 }
 445
 446 void rgb15tobgr32(const uint8_t *src, uint8_t *dst, long src_size)
 447 {
 448     const uint16_t *end;
 449     uint8_t *d = (uint8_t *)dst;
 450     const uint16_t *s = (const uint16_t *)src;
 451     end = s + src_size/2;
 452     while (s < end)
 453     {
 454         register uint16_t bgr;
 455         bgr = *s++;
 456         #ifdef WORDS_BIGENDIAN
 457             *d++ = 0;
 458             *d++ = (bgr&0x1F)<<3;
 459             *d++ = (bgr&0x3E0)>>2;
 460             *d++ = (bgr&0x7C00)>>7;
 461         #else
 462             *d++ = (bgr&0x7C00)>>7;
 463             *d++ = (bgr&0x3E0)>>2;
 464             *d++ = (bgr&0x1F)<<3;
 465             *d++ = 0;
 466         #endif
 467     }
 468 }
 469
 470 void rgb15tobgr24(const uint8_t *src, uint8_t *dst, long src_size)
 471 {
 472     const uint16_t *end;
 473     uint8_t *d = (uint8_t *)dst;
 474     const uint16_t *s = (uint16_t *)src;
 475     end = s + src_size/2;
 476     while (s < end)
 477     {
 478         register uint16_t bgr;
 479         bgr = *s++;
 480         *d++ = (bgr&0x7C00)>>7;
 481         *d++ = (bgr&0x3E0)>>2;
 482         *d++ = (bgr&0x1F)<<3;
 483     }
 484 }
 485
 486 void rgb15tobgr16(const uint8_t *src, uint8_t *dst, long src_size)
 487 {
 488     long i;
 489     long num_pixels = src_size >> 1;
 490
 491     for (i=0; i<num_pixels; i++)
 492     {
 493         unsigned b,g,r;
 494         register uint16_t rgb;
 495         rgb = src[2*i];
 496         r = rgb&0x1F;
 497         g = (rgb&0x3E0)>>5;
 498         b = (rgb&0x7C00)>>10;
 499         dst[2*i] = (b&0x1F) | ((g&0x3F)<<5) | ((r&0x1F)<<11);
 500     }
 501 }
 502
 503 void rgb15tobgr15(const uint8_t *src, uint8_t *dst, long src_size)
 504 {
 505     long i;
 506     long num_pixels = src_size >> 1;
 507
 508     for (i=0; i<num_pixels; i++)
 509     {
 510         unsigned b,g,r;
 511         register uint16_t rgb;
 512         rgb = src[2*i];
 513         r = rgb&0x1F;
 514         g = (rgb&0x3E0)>>5;
 515         b = (rgb&0x7C00)>>10;
 516         dst[2*i] = (b&0x1F) | ((g&0x1F)<<5) | ((r&0x1F)<<10);
 517     }
 518 }
 519
 520 void rgb8tobgr8(const uint8_t *src, uint8_t *dst, long src_size)
 521 {
 522     long i;
 523     long num_pixels = src_size;
 524     for (i=0; i<num_pixels; i++)
 525     {
 526         unsigned b,g,r;
 527         register uint8_t rgb;
 528         rgb = src[i];
 529         r = (rgb&0x07);
 530         g = (rgb&0x38)>>3;
 531         b = (rgb&0xC0)>>6;
 532         dst[i] = ((b<<1)&0x07) | ((g&0x07)<<3) | ((r&0x03)<<6);
 533     }
 534 }