pnggccrd.c

png图像文件格式开发包

                  "movq      %%mm6, 8(%%edi)  \n\t"

                  "movq      16(%%esi), %%mm6 \n\t"
                  "pand      %%mm2, %%mm6     \n\t"
                  "movq      %%mm2, %%mm7     \n\t"
                  "pandn     16(%%edi), %%mm7 \n\t"
                  "por       %%mm7, %%mm6     \n\t"
                  "movq      %%mm6, 16(%%edi) \n\t"

                  "movq      24(%%esi), %%mm7 \n\t"
                  "pand      %%mm3, %%mm7     \n\t"
                  "movq      %%mm3, %%mm6     \n\t"
                  "pandn     24(%%edi), %%mm6 \n\t"
                  "por       %%mm6, %%mm7     \n\t"
                  "movq      %%mm7, 24(%%edi) \n\t"

                  "movq      32(%%esi), %%mm6 \n\t"
                  "pand      %%mm4, %%mm6     \n\t"
                  "movq      %%mm4, %%mm7     \n\t"
                  "pandn     32(%%edi), %%mm7 \n\t"
                  "por       %%mm7, %%mm6     \n\t"
                  "movq      %%mm6, 32(%%edi) \n\t"

                  "movq      40(%%esi), %%mm7 \n\t"
                  "pand      %%mm5, %%mm7     \n\t"
                  "movq      %%mm5, %%mm6     \n\t"
                  "pandn     40(%%edi), %%mm6 \n\t"
                  "por       %%mm6, %%mm7     \n\t"
                  "movq      %%mm7, 40(%%edi) \n\t"

                  "addl      $48, %%esi       \n\t" // inc by 48 bytes processed
                  "addl      $48, %%edi       \n\t"
                  "subl      $8, %%ecx        \n\t" // dec by 8 pixels processed

                  "ja        mainloop48       \n\t"

                "mainloop48end:               \n\t"
// preload        "movl      diff, %%ecx      \n\t" // (diff is in eax)
                  "movl      %%eax, %%ecx     \n\t"
                  "cmpl      $0, %%ecx        \n\t"
                  "jz        end48            \n\t"
// preload        "movl      mask, %%edx      \n\t"
                  "sall      $24, %%edx       \n\t" // make low byte, high byte

                "secondloop48:                \n\t"
                  "sall      %%edx            \n\t" // move high bit to CF
                  "jnc       skip48           \n\t" // if CF = 0
                  "movl      (%%esi), %%eax   \n\t"
                  "movl      %%eax, (%%edi)   \n\t"

                "skip48:                      \n\t"
                  "addl      $4, %%esi        \n\t"
                  "addl      $4, %%edi        \n\t"
                  "decl      %%ecx            \n\t"
                  "jnz       secondloop48     \n\t"

                "end48:                       \n\t"
                  "EMMS                       \n\t" // DONE

                  : "=a" (dummy_value_a),           // output regs (dummy)
                    "=d" (dummy_value_d),
                    "=c" (dummy_value_c),
                    "=S" (dummy_value_S),
                    "=D" (dummy_value_D)

                  : "3" (srcptr),      // esi       // input regs
                    "4" (dstptr),      // edi
                    "0" (diff),        // eax
// was (unmask)     "b"    RESERVED    // ebx       // Global Offset Table idx
                    "2" (len),         // ecx
                    "1" (mask)         // edx

#if 0  /* MMX regs (%mm0, etc.) not supported by gcc 2.7.2.3 or egcs 1.1 */
                  : "%mm0", "%mm1", "%mm2", "%mm3"  // clobber list
                  , "%mm4", "%mm5", "%mm6", "%mm7"
#endif
               );
            }
            else /* mmx _not supported - Use modified C routine */
#endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
            {
               register png_uint_32 i;
               png_uint_32 initial_val = BPP6 * png_pass_start[png_ptr->pass];
                 /* png.c:  png_pass_start[] = {0, 4, 0, 2, 0, 1, 0}; */
               register int stride = BPP6 * png_pass_inc[png_ptr->pass];
                 /* png.c:  png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1}; */
               register int rep_bytes = BPP6 * png_pass_width[png_ptr->pass];
                 /* png.c:  png_pass_width[] = {8, 4, 4, 2, 2, 1, 1}; */
               png_uint_32 len = png_ptr->width &~7;  /* reduce to mult. of 8 */
               int diff = (int) (png_ptr->width & 7); /* amount lost */
               register png_uint_32 final_val = BPP6 * len;   /* GRR bugfix */

               srcptr = png_ptr->row_buf + 1 + initial_val;
               dstptr = row + initial_val;

               for (i = initial_val; i < final_val; i += stride)
               {
                  png_memcpy(dstptr, srcptr, rep_bytes);
                  srcptr += stride;
                  dstptr += stride;
               }
               if (diff)  /* number of leftover pixels:  3 for pngtest */
               {
                  final_val+=diff*BPP6;
                  for (; i < final_val; i += stride)
                  {
                     if (rep_bytes > (int)(final_val-i))
                        rep_bytes = (int)(final_val-i);
                     png_memcpy(dstptr, srcptr, rep_bytes);
                     srcptr += stride;
                     dstptr += stride;
                  }
               }
            } /* end of else (_mmx_supported) */

            break;
         }       /* end 48 bpp */

         case 64:       /* png_ptr->row_info.pixel_depth */
         {
            png_bytep srcptr;
            png_bytep dstptr;
            register png_uint_32 i;
            png_uint_32 initial_val = BPP8 * png_pass_start[png_ptr->pass];
              /* png.c:  png_pass_start[] = {0, 4, 0, 2, 0, 1, 0}; */
            register int stride = BPP8 * png_pass_inc[png_ptr->pass];
              /* png.c:  png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1}; */
            register int rep_bytes = BPP8 * png_pass_width[png_ptr->pass];
              /* png.c:  png_pass_width[] = {8, 4, 4, 2, 2, 1, 1}; */
            png_uint_32 len = png_ptr->width &~7;  /* reduce to mult. of 8 */
            int diff = (int) (png_ptr->width & 7); /* amount lost */
            register png_uint_32 final_val = BPP8 * len;   /* GRR bugfix */

            srcptr = png_ptr->row_buf + 1 + initial_val;
            dstptr = row + initial_val;

            for (i = initial_val; i < final_val; i += stride)
            {
               png_memcpy(dstptr, srcptr, rep_bytes);
               srcptr += stride;
               dstptr += stride;
            }
            if (diff)  /* number of leftover pixels:  3 for pngtest */
            {
               final_val+=diff*BPP8;
               for (; i < final_val; i += stride)
               {
                  if (rep_bytes > (int)(final_val-i))
                     rep_bytes = (int)(final_val-i);
                  png_memcpy(dstptr, srcptr, rep_bytes);
                  srcptr += stride;
                  dstptr += stride;
               }
            }

            break;
         }       /* end 64 bpp */

         default: /* png_ptr->row_info.pixel_depth != 1,2,4,8,16,24,32,48,64 */
         {
            /* this should never happen */
            png_warning(png_ptr, "Invalid row_info.pixel_depth in pnggccrd");
            break;
         }
      } /* end switch (png_ptr->row_info.pixel_depth) */

   } /* end if (non-trivial mask) */

} /* end png_combine_row() */

#endif /* PNG_HAVE_ASSEMBLER_COMBINE_ROW */




/*===========================================================================*/
/*                                                                           */
/*                 P N G _ D O _ R E A D _ I N T E R L A C E                 */
/*                                                                           */
/*===========================================================================*/

#if defined(PNG_READ_INTERLACING_SUPPORTED)
#if defined(PNG_HAVE_ASSEMBLER_READ_INTERLACE)

/* png_do_read_interlace() is called after any 16-bit to 8-bit conversion
 * has taken place.  [GRR: what other steps come before and/or after?]
 */

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;
#if defined(PNG_READ_PACKSWAP_SUPPORTED)
   png_uint_32 transformations = png_ptr->transformations;
#endif

   png_debug(1, "in png_do_read_interlace (pnggccrd.c)\n");

#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
   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();
   }
#endif

   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--;
                  }
                  else
                     dshift += s_inc;
               }
               if (sshift == s_end)
               {