rgb2rgb.c

/* 
 *
 *  rgb2rgb.c, Software RGB to RGB convertor
 *  Written by Nick Kurshev.
 */
#include <inttypes.h>
#include "../config.h"
#include "rgb2rgb.h"
#include "../mmx_defs.h"

#ifdef HAVE_MMX
static const uint64_t mask32   __attribute__((aligned(8))) = 0x00FFFFFF00FFFFFFULL;
static const uint64_t mask24l  __attribute__((aligned(8))) = 0x0000000000FFFFFFULL;
static const uint64_t mask24h  __attribute__((aligned(8))) = 0x0000FFFFFF000000ULL;
static const uint64_t mask15b  __attribute__((aligned(8))) = 0x001F001F001F001FULL; /* 00000000 00011111  xxB */
static const uint64_t mask15rg __attribute__((aligned(8))) = 0x7FE07FE07FE07FE0ULL; /* 01111111 11100000  RGx */
#endif

void rgb24to32(const uint8_t *src,uint8_t *dst,uint32_t src_size)
{
  uint8_t *dest = dst;
  const uint8_t *s = src;
  const uint8_t *end;
#ifdef HAVE_MMX
  uint8_t *mm_end;
#endif
  end = s + src_size;
#ifdef HAVE_MMX
  __asm __volatile(PREFETCH"	%0"::"m"(*s):"memory");
  mm_end = (uint8_t*)((((unsigned long)end)/(MMREG_SIZE*2))*(MMREG_SIZE*2));
  __asm __volatile("movq	%0, %%mm7"::"m"(mask32):"memory");
  if(mm_end == end) mm_end -= MMREG_SIZE*2;
  while(s < mm_end)
  {
    __asm __volatile(
	PREFETCH"	32%1\n\t"
	"movd	%1, %%mm0\n\t"
	"movd	3%1, %%mm1\n\t"
	"movd	6%1, %%mm2\n\t"
	"movd	9%1, %%mm3\n\t"
	"punpckldq %%mm1, %%mm0\n\t"
	"punpckldq %%mm3, %%mm2\n\t"
	"pand	%%mm7, %%mm0\n\t"
	"pand	%%mm7, %%mm2\n\t"
	MOVNTQ"	%%mm0, %0\n\t"
	MOVNTQ"	%%mm2, 8%0"
	:"=m"(*dest)
	:"m"(*s)
	:"memory");
    dest += 16;
    s += 12;
  }
  __asm __volatile(SFENCE:::"memory");
  __asm __volatile(EMMS:::"memory");
#endif
  while(s < end)
  {
    *dest++ = *s++;
    *dest++ = *s++;
    *dest++ = *s++;
    *dest++ = 0;
  }
}

void rgb32to24(const uint8_t *src,uint8_t *dst,uint32_t src_size)
{
  uint8_t *dest = dst;
  const uint8_t *s = src;
  const uint8_t *end;
#ifdef HAVE_MMX
  uint8_t *mm_end;
#endif
  end = s + src_size;
#ifdef HAVE_MMX
  __asm __volatile(PREFETCH"	%0"::"m"(*s):"memory");
  mm_end = (uint8_t*)((((unsigned long)end)/(MMREG_SIZE*2))*(MMREG_SIZE*2));
  __asm __volatile(
	"movq	%0, %%mm7\n\t"
	"movq	%1, %%mm6"
	::"m"(mask24l),"m"(mask24h):"memory");
  if(mm_end == end) mm_end -= MMREG_SIZE*2;
  while(s < mm_end)
  {
    __asm __volatile(
	PREFETCH"	32%1\n\t"
	"movq	%1, %%mm0\n\t"
	"movq	8%1, %%mm1\n\t"
	"movq	%%mm0, %%mm2\n\t"
	"movq	%%mm1, %%mm3\n\t"
	"psrlq	$8, %%mm2\n\t"
	"psrlq	$8, %%mm3\n\t"
	"pand	%%mm7, %%mm0\n\t"
	"pand	%%mm7, %%mm1\n\t"
	"pand	%%mm6, %%mm2\n\t"
	"pand	%%mm6, %%mm3\n\t"
	"por	%%mm2, %%mm0\n\t"
	"por	%%mm3, %%mm1\n\t"
	MOVNTQ"	%%mm0, %0\n\t"
	MOVNTQ"	%%mm1, 6%0"
	:"=m"(*dest)
	:"m"(*s)
	:"memory");
    dest += 12;
    s += 16;
  }
  __asm __volatile(SFENCE:::"memory");
  __asm __volatile(EMMS:::"memory");
#endif
  while(s < end)
  {
    *dest++ = *s++;
    *dest++ = *s++;
    *dest++ = *s++;
    s++;
  }
}

/*
 Original by Strepto/Astral
 ported to gcc & bugfixed : A'rpi
 MMX2, 3DNOW optimization by Nick Kurshev
*/
void rgb15to16(const uint8_t *src,uint8_t *dst,uint32_t src_size)
{
#ifdef HAVE_MMX
  register const char* s=src+src_size;
  register char* d=dst+src_size;
  register int offs=-src_size;
  __asm __volatile(PREFETCH"	%0"::"m"(*(s+offs)):"memory");
  __asm __volatile(
	"movq	%0, %%mm4\n\t"
	"movq	%1, %%mm5"
	::"m"(mask15b), "m"(mask15rg):"memory");
  while(offs<0)
  {
	__asm __volatile(
		PREFETCH"	32%1\n\t"
		"movq	%1, %%mm0\n\t"
		"movq	8%1, %%mm2\n\t"
		"movq	%%mm0, %%mm1\n\t"
		"movq	%%mm2, %%mm3\n\t"
		"pand	%%mm4, %%mm0\n\t"
		"pand	%%mm5, %%mm1\n\t"
		"pand	%%mm4, %%mm2\n\t"
		"pand	%%mm5, %%mm3\n\t"
		"psllq	$1, %%mm1\n\t"
		"psllq	$1, %%mm3\n\t"
		"por	%%mm1, %%mm0\n\t"
		"por	%%mm3, %%mm2\n\t"
		MOVNTQ"	%%mm0, %0\n\t"
		MOVNTQ"	%%mm2, 8%0"
		:"=m"(*(d+offs))
		:"m"(*(s+offs))
		:"memory");
	offs+=16;
  }
  __asm __volatile(SFENCE:::"memory");
  __asm __volatile(EMMS:::"memory");
#else
   const uint16_t *s1=( uint16_t * )src;
   uint16_t *d1=( uint16_t * )dst;
   uint16_t *e=((uint8_t *)s1)+src_size;
   while( s1<e ){
     register int x=*( s1++ );
     /* rrrrrggggggbbbbb
        0rrrrrgggggbbbbb
        0111 1111 1110 0000=0x7FE0
        00000000000001 1111=0x001F */
     *( d1++ )=( x&0x001F )|( ( x&0x7FE0 )<<1 );
   }
#endif
}