?? pngvcrd.c
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sub ecx,8 //dec by 8 pixels processed ja mainloop32mainloop32end: mov ecx,diff cmp ecx,0 jz end32 mov edx,mask sal edx,24 //make low byte the high bytesecondloop32: sal edx,1 //move high bit to CF jnc skip32 //if CF = 0 mov eax,[esi] mov [ebx],eaxskip32: add esi,4 add ebx,4 dec ecx jnz secondloop32end32: emms } } else /* mmx _not supported - Use modified C routine */ { register unsigned int incr1, initial_val, final_val; png_size_t pixel_bytes; png_uint_32 i; register int disp = png_pass_inc[png_ptr->pass]; int offset_table[7] = {0, 4, 0, 2, 0, 1, 0}; pixel_bytes = (png_ptr->row_info.pixel_depth >> 3); srcptr = png_ptr->row_buf + 1 + offset_table[png_ptr->pass]* pixel_bytes; dstptr = row + offset_table[png_ptr->pass]*pixel_bytes; initial_val = offset_table[png_ptr->pass]*pixel_bytes; final_val = png_ptr->width*pixel_bytes; incr1 = (disp)*pixel_bytes; for (i = initial_val; i < final_val; i += incr1) { png_memcpy(dstptr, srcptr, pixel_bytes); srcptr += incr1; dstptr += incr1; } } /* end of else */ break; } // end 32 bpp case 48: { png_bytep srcptr; png_bytep dstptr; png_uint_32 len; int unmask, diff; __int64 mask5=0x0101010101010202, mask4=0x0202020204040404, mask3=0x0404080808080808, mask2=0x1010101010102020, mask1=0x2020202040404040, mask0=0x4040808080808080;#if !defined(PNG_1_0_X) if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_COMBINE_ROW) /* && mmx_supported */ )#else if (mmx_supported)#endif { srcptr = png_ptr->row_buf + 1; dstptr = row; unmask = ~mask; len = (png_ptr->width)&~7; diff = (png_ptr->width)&7; _asm { movd mm7, unmask //load bit pattern psubb mm6,mm6 //zero mm6 punpcklbw mm7,mm7 punpcklwd mm7,mm7 punpckldq mm7,mm7 //fill register with 8 masks movq mm0,mask0 movq mm1,mask1 movq mm2,mask2 movq mm3,mask3 movq mm4,mask4 movq mm5,mask5 pand mm0,mm7 pand mm1,mm7 pand mm2,mm7 pand mm3,mm7 pand mm4,mm7 pand mm5,mm7 pcmpeqb mm0,mm6 pcmpeqb mm1,mm6 pcmpeqb mm2,mm6 pcmpeqb mm3,mm6 pcmpeqb mm4,mm6 pcmpeqb mm5,mm6 mov ecx,len //load length of line mov esi,srcptr //load source mov ebx,dstptr //load dest cmp ecx,0 jz mainloop48endmainloop48: movq mm7,[esi] pand mm7,mm0 movq mm6,mm0 pandn mm6,[ebx] por mm7,mm6 movq [ebx],mm7 movq mm6,[esi+8] pand mm6,mm1 movq mm7,mm1 pandn mm7,[ebx+8] por mm6,mm7 movq [ebx+8],mm6 movq mm6,[esi+16] pand mm6,mm2 movq mm7,mm2 pandn mm7,[ebx+16] por mm6,mm7 movq [ebx+16],mm6 movq mm7,[esi+24] pand mm7,mm3 movq mm6,mm3 pandn mm6,[ebx+24] por mm7,mm6 movq [ebx+24],mm7 movq mm6,[esi+32] pand mm6,mm4 movq mm7,mm4 pandn mm7,[ebx+32] por mm6,mm7 movq [ebx+32],mm6 movq mm7,[esi+40] pand mm7,mm5 movq mm6,mm5 pandn mm6,[ebx+40] por mm7,mm6 movq [ebx+40],mm7 add esi,48 //inc by 32 bytes processed add ebx,48 sub ecx,8 //dec by 8 pixels processed ja mainloop48mainloop48end: mov ecx,diff cmp ecx,0 jz end48 mov edx,mask sal edx,24 //make low byte the high bytesecondloop48: sal edx,1 //move high bit to CF jnc skip48 //if CF = 0 mov eax,[esi] mov [ebx],eaxskip48: add esi,4 add ebx,4 dec ecx jnz secondloop48end48: emms } } else /* mmx _not supported - Use modified C routine */ { register unsigned int incr1, initial_val, final_val; png_size_t pixel_bytes; png_uint_32 i; register int disp = png_pass_inc[png_ptr->pass]; int offset_table[7] = {0, 4, 0, 2, 0, 1, 0}; pixel_bytes = (png_ptr->row_info.pixel_depth >> 3); srcptr = png_ptr->row_buf + 1 + offset_table[png_ptr->pass]* pixel_bytes; dstptr = row + offset_table[png_ptr->pass]*pixel_bytes; initial_val = offset_table[png_ptr->pass]*pixel_bytes; final_val = png_ptr->width*pixel_bytes; incr1 = (disp)*pixel_bytes; for (i = initial_val; i < final_val; i += incr1) { png_memcpy(dstptr, srcptr, pixel_bytes); srcptr += incr1; dstptr += incr1; } } /* end of else */ break; } // end 48 bpp default: { png_bytep sptr; png_bytep dp; png_size_t pixel_bytes; int offset_table[7] = {0, 4, 0, 2, 0, 1, 0}; unsigned int i; register int disp = png_pass_inc[png_ptr->pass]; // get the offset register unsigned int incr1, initial_val, final_val; pixel_bytes = (png_ptr->row_info.pixel_depth >> 3); sptr = png_ptr->row_buf + 1 + offset_table[png_ptr->pass]* pixel_bytes; dp = row + offset_table[png_ptr->pass]*pixel_bytes; initial_val = offset_table[png_ptr->pass]*pixel_bytes; final_val = png_ptr->width*pixel_bytes; incr1 = (disp)*pixel_bytes; for (i = initial_val; i < final_val; i += incr1) { png_memcpy(dp, sptr, pixel_bytes); sptr += incr1; dp += incr1; } break; } } /* end switch (png_ptr->row_info.pixel_depth) */ } /* end if (non-trivial mask) */} /* end png_combine_row() */#if defined(PNG_READ_INTERLACING_SUPPORTED)void /* PRIVATE */png_do_read_interlace(png_structp png_ptr){ png_row_infop row_info = &(png_ptr->row_info); png_bytep row = png_ptr->row_buf + 1; int pass = png_ptr->pass; png_uint_32 transformations = png_ptr->transformations;#ifdef PNG_USE_LOCAL_ARRAYS const int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};#endif png_debug(1,"in png_do_read_interlace\n"); if (mmx_supported == 2) {#if !defined(PNG_1_0_X) /* this should have happened in png_init_mmx_flags() already */ png_warning(png_ptr, "asm_flags may not have been initialized");#endif png_mmx_support(); } if (row != NULL && row_info != NULL) { png_uint_32 final_width; final_width = row_info->width * png_pass_inc[pass]; switch (row_info->pixel_depth) { case 1: { png_bytep sp, dp; int sshift, dshift; int s_start, s_end, s_inc; png_byte v; png_uint_32 i; int j; sp = row + (png_size_t)((row_info->width - 1) >> 3); dp = row + (png_size_t)((final_width - 1) >> 3);#if defined(PNG_READ_PACKSWAP_SUPPORTED) if (transformations & PNG_PACKSWAP) { sshift = (int)((row_info->width + 7) & 7); dshift = (int)((final_width + 7) & 7); s_start = 7; s_end = 0; s_inc = -1; } else#endif { sshift = 7 - (int)((row_info->width + 7) & 7); dshift = 7 - (int)((final_width + 7) & 7); s_start = 0; s_end = 7; s_inc = 1; } for (i = row_info->width; i; i--) { v = (png_byte)((*sp >> sshift) & 0x1); for (j = 0; j < png_pass_inc[pass]; j++) { *dp &= (png_byte)((0x7f7f >> (7 - dshift)) & 0xff); *dp |= (png_byte)(v << dshift); if (dshift == s_end) { dshift = s_start; dp--; } else dshift += s_inc; } if (sshift == s_end) { sshift = s_start; sp--; } else sshift += s_inc; } break; } case 2: { png_bytep sp, dp; int sshift, dshift; int s_start, s_end, s_inc; png_uint_32 i; sp = row + (png_size_t)((row_info->width - 1) >> 2); dp = row + (png_size_t)((final_width - 1) >> 2);#if defined(PNG_READ_PACKSWAP_SUPPORTED) if (transformations & PNG_PACKSWAP) { sshift = (png_size_t)(((row_info->width + 3) & 3) << 1); dshift = (png_size_t)(((final_width + 3) & 3) << 1); s_start = 6; s_end = 0; s_inc = -2; } else#endif { sshift = (png_size_t)((3 - ((row_info->width + 3) & 3)) << 1); dshift = (png_size_t)((3 - ((final_width + 3) & 3)) << 1); s_start = 0; s_end = 6; s_inc = 2; } for (i = row_info->width; i; i--) { png_byte v; int j; v = (png_byte)((*sp >> sshift) & 0x3); for (j = 0; j < png_pass_inc[pass]; j++) { *dp &= (png_byte)((0x3f3f >> (6 - dshift)) & 0xff); *dp |= (png_byte)(v << dshift); if (dshift == s_end) { dshift = s_start; dp--;?? 快捷鍵說明
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