?? pngvcrd.c
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else if (((pass == 2) || (pass == 3)) && width) { int width_mmx = ((width >> 1) << 1) ; width -= width_mmx; if (width_mmx) { _asm { mov esi, sptr mov edi, dp mov ecx, width_mmx sub esi, 2 sub edi, 14loop2_pass2: movd mm0, [esi] ; X X X X v1 v0 v3 v2 punpcklwd mm0, mm0 ; v1 v0 v1 v0 v3 v2 v3 v2 movq mm1, mm0 ; v1 v0 v1 v0 v3 v2 v3 v2 punpckldq mm0, mm0 ; v3 v2 v3 v2 v3 v2 v3 v2 punpckhdq mm1, mm1 ; v1 v0 v1 v0 v1 v0 v1 v0 movq [edi], mm0 sub esi, 4 movq [edi + 8], mm1 //sub esi, 4 sub edi, 16 sub ecx, 2 jnz loop2_pass2 EMMS } } sptr -= (width_mmx*2 - 2); // sign fixed dp -= (width_mmx*8 - 2); // sign fixed for (i = width; i; i--) { png_byte v[8]; int j; sptr -= 2; png_memcpy(v, sptr, 2); for (j = 0; j < png_pass_inc[pass]; j++) { dp -= 2; png_memcpy(dp, v, 2); } } } else if (width) // pass == 4 or 5 { int width_mmx = ((width >> 1) << 1) ; width -= width_mmx; if (width_mmx) { _asm { mov esi, sptr mov edi, dp mov ecx, width_mmx sub esi, 2 sub edi, 6loop2_pass4: movd mm0, [esi] ; X X X X v1 v0 v3 v2 punpcklwd mm0, mm0 ; v1 v0 v1 v0 v3 v2 v3 v2 sub esi, 4 movq [edi], mm0 sub edi, 8 sub ecx, 2 jnz loop2_pass4 EMMS } } sptr -= (width_mmx*2 - 2); // sign fixed dp -= (width_mmx*4 - 2); // sign fixed for (i = width; i; i--) { png_byte v[8]; int j; sptr -= 2; png_memcpy(v, sptr, 2); for (j = 0; j < png_pass_inc[pass]; j++) { dp -= 2; png_memcpy(dp, v, 2); } } } } /* end of pixel_bytes == 2 */ else if (pixel_bytes == 4) { if (((pass == 0) || (pass == 1)) && width) { int width_mmx = ((width >> 1) << 1) ; width -= width_mmx; if (width_mmx) { _asm { mov esi, sptr mov edi, dp mov ecx, width_mmx sub esi, 4 sub edi, 60loop4_pass0: movq mm0, [esi] ; v3 v2 v1 v0 v7 v6 v5 v4 movq mm1, mm0 ; v3 v2 v1 v0 v7 v6 v5 v4 punpckldq mm0, mm0 ; v7 v6 v5 v4 v7 v6 v5 v4 punpckhdq mm1, mm1 ; v3 v2 v1 v0 v3 v2 v1 v0 movq [edi], mm0 movq [edi + 8], mm0 movq [edi + 16], mm0 movq [edi + 24], mm0 movq [edi+32], mm1 movq [edi + 40], mm1 movq [edi+ 48], mm1 sub esi, 8 movq [edi + 56], mm1 sub edi, 64 sub ecx, 2 jnz loop4_pass0 EMMS } } sptr -= (width_mmx*4 - 4); // sign fixed dp -= (width_mmx*32 - 4); // sign fixed for (i = width; i; i--) { png_byte v[8]; int j; sptr -= 4; png_memcpy(v, sptr, 4); for (j = 0; j < png_pass_inc[pass]; j++) { dp -= 4; png_memcpy(dp, v, 4); } } } else if (((pass == 2) || (pass == 3)) && width) { int width_mmx = ((width >> 1) << 1) ; width -= width_mmx; if (width_mmx) { _asm { mov esi, sptr mov edi, dp mov ecx, width_mmx sub esi, 4 sub edi, 28loop4_pass2: movq mm0, [esi] ; v3 v2 v1 v0 v7 v6 v5 v4 movq mm1, mm0 ; v3 v2 v1 v0 v7 v6 v5 v4 punpckldq mm0, mm0 ; v7 v6 v5 v4 v7 v6 v5 v4 punpckhdq mm1, mm1 ; v3 v2 v1 v0 v3 v2 v1 v0 movq [edi], mm0 movq [edi + 8], mm0 movq [edi+16], mm1 movq [edi + 24], mm1 sub esi, 8 sub edi, 32 sub ecx, 2 jnz loop4_pass2 EMMS } } sptr -= (width_mmx*4 - 4); // sign fixed dp -= (width_mmx*16 - 4); // sign fixed for (i = width; i; i--) { png_byte v[8]; int j; sptr -= 4; png_memcpy(v, sptr, 4); for (j = 0; j < png_pass_inc[pass]; j++) { dp -= 4; png_memcpy(dp, v, 4); } } } else if (width) // pass == 4 or 5 { int width_mmx = ((width >> 1) << 1) ; width -= width_mmx; if (width_mmx) { _asm { mov esi, sptr mov edi, dp mov ecx, width_mmx sub esi, 4 sub edi, 12loop4_pass4: movq mm0, [esi] ; v3 v2 v1 v0 v7 v6 v5 v4 movq mm1, mm0 ; v3 v2 v1 v0 v7 v6 v5 v4 punpckldq mm0, mm0 ; v7 v6 v5 v4 v7 v6 v5 v4 punpckhdq mm1, mm1 ; v3 v2 v1 v0 v3 v2 v1 v0 movq [edi], mm0 sub esi, 8 movq [edi + 8], mm1 sub edi, 16 sub ecx, 2 jnz loop4_pass4 EMMS } } sptr -= (width_mmx*4 - 4); // sign fixed dp -= (width_mmx*8 - 4); // sign fixed for (i = width; i; i--) { png_byte v[8]; int j; sptr -= 4; png_memcpy(v, sptr, 4); for (j = 0; j < png_pass_inc[pass]; j++) { dp -= 4; png_memcpy(dp, v, 4); } } } } /* end of pixel_bytes == 4 */ else if (pixel_bytes == 6) { for (i = width; i; i--) { png_byte v[8]; int j; png_memcpy(v, sptr, 6); for (j = 0; j < png_pass_inc[pass]; j++) { png_memcpy(dp, v, 6); dp -= 6; } sptr -= 6; } } /* end of pixel_bytes == 6 */ else { for (i = width; i; i--) { png_byte v[8]; int j; png_memcpy(v, sptr, pixel_bytes); for (j = 0; j < png_pass_inc[pass]; j++) { png_memcpy(dp, v, pixel_bytes); dp -= pixel_bytes; } sptr-= pixel_bytes; } } } /* end of mmx_supported */ else /* MMX not supported: use modified C code - takes advantage * of inlining of memcpy for a constant */ { if (pixel_bytes == 1) { for (i = width; i; i--) { int j; for (j = 0; j < png_pass_inc[pass]; j++) *dp-- = *sptr; sptr--; } } else if (pixel_bytes == 3) { for (i = width; i; i--) { png_byte v[8]; int j; png_memcpy(v, sptr, pixel_bytes); for (j = 0; j < png_pass_inc[pass]; j++) { png_memcpy(dp, v, pixel_bytes); dp -= pixel_bytes; } sptr -= pixel_bytes; } } else if (pixel_bytes == 2) { for (i = width; i; i--) { png_byte v[8]; int j; png_memcpy(v, sptr, pixel_bytes); for (j = 0; j < png_pass_inc[pass]; j++) { png_memcpy(dp, v, pixel_bytes); dp -= pixel_bytes; } sptr -= pixel_bytes; } } else if (pixel_bytes == 4) { for (i = width; i; i--) { png_byte v[8]; int j; png_memcpy(v, sptr, pixel_bytes); for (j = 0; j < png_pass_inc[pass]; j++) { png_memcpy(dp, v, pixel_bytes); dp -= pixel_bytes; } sptr -= pixel_bytes; } } else if (pixel_bytes == 6) { for (i = width; i; i--) { png_byte v[8]; int j; png_memcpy(v, sptr, pixel_bytes); for (j = 0; j < png_pass_inc[pass]; j++) { png_memcpy(dp, v, pixel_bytes); dp -= pixel_bytes; } sptr -= pixel_bytes; } } else { for (i = width; i; i--) { png_byte v[8]; int j; png_memcpy(v, sptr, pixel_bytes); for (j = 0; j < png_pass_inc[pass]; j++) { png_memcpy(dp, v, pixel_bytes); dp -= pixel_bytes; } sptr -= pixel_bytes; } } } /* end of MMX not supported */ break; } } /* end switch (row_info->pixel_depth) */ row_info->width = final_width; row_info->rowbytes = ((final_width * (png_uint_32)row_info->pixel_depth + 7) >> 3); }}#endif /* PNG_READ_INTERLACING_SUPPORTED */// These variables are utilized in the functions below. They are declared// globally here to ensure alignment on 8-byte boundaries.union uAll { __int64 use; double align?? 快捷鍵說明
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