pnggccrd.c

Qt/Embedded是一个多平台的C++图形用户界面应用程序框架

         case 48:       // png_ptr->row_info.pixel_depth
         {
            png_bytep srcptr;
            png_bytep dstptr;

            if (mmx_supported)
            {
               png_uint_32 len;
               int diff;
#ifndef __PIC__
               int unmask = ~mask;
#else
               _unmask = ~mask;            // global variable for -fPIC version
#endif
               srcptr = png_ptr->row_buf + 1;
               dstptr = row;
               len  = png_ptr->width &~7;  // reduce to multiple of 8
               diff = png_ptr->width & 7;  // amount lost

               __asm__ (
#ifdef __PIC__
                  "movd      _unmask, %%mm7   \n\t" // load bit pattern
#else
// preload        "movd      unmask, %%mm7    \n\t" // (unmask is in ebx)
                  "movd      %%ebx, %%mm7     \n\t" // load bit pattern (unmask)
#endif
                  "psubb     %%mm6, %%mm6     \n\t" // zero mm6
                  "punpcklbw %%mm7, %%mm7     \n\t"
                  "punpcklwd %%mm7, %%mm7     \n\t"
                  "punpckldq %%mm7, %%mm7     \n\t" // fill reg with 8 masks

                  "movq      _mask48_0, %%mm0 \n\t"
                  "movq      _mask48_1, %%mm1 \n\t"
                  "movq      _mask48_2, %%mm2 \n\t"
                  "movq      _mask48_3, %%mm3 \n\t"
                  "movq      _mask48_4, %%mm4 \n\t"
                  "movq      _mask48_5, %%mm5 \n\t"

                  "pand      %%mm7, %%mm0     \n\t"
                  "pand      %%mm7, %%mm1     \n\t"
                  "pand      %%mm7, %%mm2     \n\t"
                  "pand      %%mm7, %%mm3     \n\t"
                  "pand      %%mm7, %%mm4     \n\t"
                  "pand      %%mm7, %%mm5     \n\t"

                  "pcmpeqb   %%mm6, %%mm0     \n\t"
                  "pcmpeqb   %%mm6, %%mm1     \n\t"
                  "pcmpeqb   %%mm6, %%mm2     \n\t"
                  "pcmpeqb   %%mm6, %%mm3     \n\t"
                  "pcmpeqb   %%mm6, %%mm4     \n\t"
                  "pcmpeqb   %%mm6, %%mm5     \n\t"

// preload        "movl      len, %%ecx       \n\t" // load length of line
// preload        "movl      srcptr, %%esi    \n\t" // load source
// preload        "movl      dstptr, %%edi    \n\t" // load dest

                  "cmpl      $0, %%ecx        \n\t"
                  "jz        mainloop48end    \n\t"

                "mainloop48:                  \n\t"
                  "movq      (%%esi), %%mm7   \n\t"
                  "pand      %%mm0, %%mm7     \n\t"
                  "movq      %%mm0, %%mm6     \n\t"
                  "pandn     (%%edi), %%mm6   \n\t"
                  "por       %%mm6, %%mm7     \n\t"
                  "movq      %%mm7, (%%edi)   \n\t"

                  "movq      8(%%esi), %%mm6  \n\t"
                  "pand      %%mm1, %%mm6     \n\t"
                  "movq      %%mm1, %%mm7     \n\t"
                  "pandn     8(%%edi), %%mm7  \n\t"
                  "por       %%mm7, %%mm6     \n\t"
                  "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

                  :                                 // output regs (none)

                  : "S" (srcptr),      // esi       // input regs
                    "D" (dstptr),      // edi
                    "a" (diff),        // eax
#ifndef __PIC__
                    "b" (unmask),      // ebx       // Global Offset Table idx
#endif
                    "c" (len),         // ecx
                    "d" (mask)         // edx

                  : "%esi", "%edi", "%eax",         // clobber list
                    "%ecx", "%edx"
#if 0  /* MMX regs (%mm0, etc.) not supported by gcc 2.7.2.3 or egcs 1.1 */
                  , "%mm0", "%mm1", "%mm2", "%mm3",
                    "%mm4", "%mm5", "%mm6", "%mm7"
#endif
               );
            }
            else /* mmx _not supported - Use modified C routine */
            {
               register png_uint_32 i;
               png_uint_32 initial_val = 6 * png_pass_start[png_ptr->pass];
                 // png.c:  png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
               register int stride = 6 * png_pass_inc[png_ptr->pass];
                 // png.c:  png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
               register int rep_bytes = 6 * png_pass_width[png_ptr->pass];
                 // png.c:  png_pass_width[] = {8, 4, 4, 2, 2, 1, 1};
               register png_uint_32 final_val = 6 * png_ptr->width;

               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;
               } 
            } /* end of else */

            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 = 8 * png_pass_start[png_ptr->pass];
              // png.c:  png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
            register int stride = 8 * png_pass_inc[png_ptr->pass];
              // png.c:  png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
            register int rep_bytes = 8 * png_pass_width[png_ptr->pass];
              // png.c:  png_pass_width[] = {8, 4, 4, 2, 2, 1, 1};
            register png_uint_32 final_val = 8 * png_ptr->width;

            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;
            } 
            break;
         }       // end 64 bpp

         default:   // png_ptr->row_info.pixel_depth != 1,2,4,8,16,24,32,48,64
         {
            // this should never happen
            fprintf(stderr,
              "libpng internal error:  png_ptr->row_info.pixel_depth = %d\n",
              png_ptr->row_info.pixel_depth);
            fflush(stderr);
            break;
         }
      } /* end switch (png_ptr->row_info.pixel_depth) */

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

} /* end png_combine_row() */

#endif /* PNG_HAVE_ASSEMBLER_COMBINE_ROW */



#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_row_infop row_info, png_bytep row, int pass,
   png_uint_32 transformations)
{
/*
fprintf(stderr, "GRR DEBUG:  entering png_do_read_interlace()\n");
if (row == NULL) fprintf(stderr, "GRR DEBUG:  row == NULL\n");
if (row_info == NULL) fprintf(stderr, "GRR DEBUG:  row_info == NULL\n");
fflush(stderr);
 */
   png_debug(1,"in png_do_read_interlace\n");

   if (mmx_supported == 2)
       mmx_supported = mmxsupport();
/*
{
fprintf(stderr, "GRR DEBUG:  calling mmxsupport()\n");
fprintf(stderr, "GRR DEBUG:  done with mmxsupport() (mmx_supported = %d)\n", mmx_supported);
}
 */

/*
this one happened on first row due to weirdness with mmxsupport():
if (row == NULL) fprintf(stderr, "GRR DEBUG:  now row == NULL!!!\n");
  row was in ebx, and even though nothing touched ebx, it still got wiped...
  [weird side effect of CPUID instruction?]
if (row_info == NULL) fprintf(stderr, "GRR DEBUG:  now row_info == NULL!!!\n");
 */
   if (row != NULL && row_info != NULL)
   {
      png_uint_32 final_width;

      final_width = row_info->width * png_pass_inc[pass];

/*
fprintf(stderr, "GRR DEBUG:  png_do_read_interlace() row_info->width = %d, final_width = %d\n", row_info->width, final_width);
fprintf(stderr, "GRR DEBUG:  png_do_read_interlace() pixel_depth = %d\n", row_info->pixel_depth);
fflush(stderr);
 */
      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;