📄 pngvcrd.c
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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) { if (pixel_bytes > (png_size_t)(final_val-i)) pixel_bytes = (png_size_t)(final_val-i); png_memcpy(dstptr, srcptr, pixel_bytes); srcptr += incr1; dstptr += incr1; } } /* end of else */ break; } // end 8 bpp case 16: { png_bytep srcptr; png_bytep dstptr; png_uint_32 len; int unmask, diff; __int64 mask1=0x0101020204040808, mask0=0x1010202040408080; if ( mmx_supported ) { 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 pand mm0,mm7 pand mm1,mm7 pcmpeqb mm0,mm6 pcmpeqb mm1,mm6 mov ecx,len //load length of line mov esi,srcptr //load source mov ebx,dstptr //load dest cmp ecx,0 //lcr jz mainloop16endmainloop16: movq mm4,[esi] pand mm4,mm0 movq mm6,mm0 movq mm7,[ebx] pandn mm6,mm7 por mm4,mm6 movq [ebx],mm4 movq mm5,[esi+8] pand mm5,mm1 movq mm7,mm1 movq mm6,[ebx+8] pandn mm7,mm6 por mm5,mm7 movq [ebx+8],mm5 add esi,16 //inc by 16 bytes processed add ebx,16 sub ecx,8 //dec by 8 pixels processed ja mainloop16mainloop16end: mov ecx,diff cmp ecx,0 jz end16 mov edx,mask sal edx,24 //make low byte the high bytesecondloop16: sal edx,1 //move high bit to CF jnc skip16 //if CF = 0 mov ax,[esi] mov [ebx],axskip16: add esi,2 add ebx,2 dec ecx jnz secondloop16end16: 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) { if (pixel_bytes > (png_size_t)(final_val-i)) pixel_bytes = (png_size_t)(final_val-i); png_memcpy(dstptr, srcptr, pixel_bytes); srcptr += incr1; dstptr += incr1; } } /* end of else */ break; } // end 16 bpp case 24: { png_bytep srcptr; png_bytep dstptr; png_uint_32 len; int unmask, diff; __int64 mask2=0x0101010202020404, //24bpp mask1=0x0408080810101020, mask0=0x2020404040808080; srcptr = png_ptr->row_buf + 1; dstptr = row; unmask = ~mask; len = (png_ptr->width)&~7; diff = (png_ptr->width)&7; if ( mmx_supported ) { _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 pand mm0,mm7 pand mm1,mm7 pand mm2,mm7 pcmpeqb mm0,mm6 pcmpeqb mm1,mm6 pcmpeqb mm2,mm6 mov ecx,len //load length of line mov esi,srcptr //load source mov ebx,dstptr //load dest cmp ecx,0 jz mainloop24endmainloop24: movq mm4,[esi] pand mm4,mm0 movq mm6,mm0 movq mm7,[ebx] pandn mm6,mm7 por mm4,mm6 movq [ebx],mm4 movq mm5,[esi+8] pand mm5,mm1 movq mm7,mm1 movq mm6,[ebx+8] pandn mm7,mm6 por mm5,mm7 movq [ebx+8],mm5 movq mm6,[esi+16] pand mm6,mm2 movq mm4,mm2 movq mm7,[ebx+16] pandn mm4,mm7 por mm6,mm4 movq [ebx+16],mm6 add esi,24 //inc by 24 bytes processed add ebx,24 sub ecx,8 //dec by 8 pixels processed ja mainloop24mainloop24end: mov ecx,diff cmp ecx,0 jz end24 mov edx,mask sal edx,24 //make low byte the high bytesecondloop24: sal edx,1 //move high bit to CF jnc skip24 //if CF = 0 mov ax,[esi] mov [ebx],ax xor eax,eax mov al,[esi+2] mov [ebx+2],alskip24: add esi,3 add ebx,3 dec ecx jnz secondloop24end24: 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) { if (pixel_bytes > (png_size_t)(final_val-i)) pixel_bytes = (png_size_t)(final_val-i); png_memcpy(dstptr, srcptr, pixel_bytes); srcptr += incr1; dstptr += incr1; } } /* end of else */ break; } // end 24 bpp case 32: { png_bytep srcptr; png_bytep dstptr; png_uint_32 len; int unmask, diff; __int64 mask3=0x0101010102020202, //32bpp mask2=0x0404040408080808, mask1=0x1010101020202020, mask0=0x4040404080808080; srcptr = png_ptr->row_buf + 1; dstptr = row; unmask = ~mask; len = (png_ptr->width)&~7; diff = (png_ptr->width)&7; if ( mmx_supported ) { _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 pand mm0,mm7 pand mm1,mm7 pand mm2,mm7 pand mm3,mm7 pcmpeqb mm0,mm6 pcmpeqb mm1,mm6 pcmpeqb mm2,mm6 pcmpeqb mm3,mm6 mov ecx,len //load length of line mov esi,srcptr //load source mov ebx,dstptr //load dest cmp ecx,0 //lcr jz mainloop32endmainloop32: movq mm4,[esi] pand mm4,mm0 movq mm6,mm0 movq mm7,[ebx] pandn mm6,mm7 por mm4,mm6 movq [ebx],mm4 movq mm5,[esi+8] pand mm5,mm1 movq mm7,mm1 movq mm6,[ebx+8] pandn mm7,mm6 por mm5,mm7 movq [ebx+8],mm5 movq mm6,[esi+16] pand mm6,mm2 movq mm4,mm2 movq mm7,[ebx+16] pandn mm4,mm7 por mm6,mm4 movq [ebx+16],mm6 movq mm7,[esi+24] pand mm7,mm3 movq mm5,mm3 movq mm4,[ebx+24] pandn mm5,mm4 por mm7,mm5 movq [ebx+24],mm7 add esi,32 //inc by 32 bytes processed add ebx,32 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⌨️ 快捷键说明
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