diff --git a/pngread.c b/pngread.c
index a4cbb3e2..aab6f605 100644
--- a/pngread.c
+++ b/pngread.c
@@ -1,7 +1,7 @@
 
 /* pngread.c - read a PNG file
  *
- * Last changed in libpng 1.2.37 [June 4, 2009]
+ * Last changed in libpng 1.2.41 [October 17, 2009]
  * Copyright (c) 1998-2009 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -16,7 +16,8 @@
 
 #define PNG_INTERNAL
 #include "png.h"
-#if defined(PNG_READ_SUPPORTED)
+#ifdef PNG_READ_SUPPORTED
+
 
 /* Create a PNG structure for reading, and allocate any memory needed. */
 png_structp PNGAPI
@@ -51,6 +52,7 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
    int i;
 
    png_debug(1, "in png_create_read_struct");
+
 #ifdef PNG_USER_MEM_SUPPORTED
    png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
       (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
@@ -86,7 +88,7 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
 #ifdef USE_FAR_KEYWORD
    png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
 #endif
-#endif
+#endif /* PNG_SETJMP_SUPPORTED */
 
 #ifdef PNG_USER_MEM_SUPPORTED
    png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
@@ -96,48 +98,48 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
 
    if (user_png_ver)
    {
-     i = 0;
-     do
-     {
-       if (user_png_ver[i] != png_libpng_ver[i])
-          png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
-     } while (png_libpng_ver[i++]);
-   }
-   else
-        png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
+      i = 0;
+      do
+      {
+         if (user_png_ver[i] != png_libpng_ver[i])
+            png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
+      } while (png_libpng_ver[i++]);
+    }
+    else
+         png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
 
 
-   if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
-   {
-     /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
-      * we must recompile any applications that use any older library version.
-      * For versions after libpng 1.0, we will be compatible, so we need
-      * only check the first digit.
-      */
-     if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
-         (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
-         (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
-     {
+    if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
+    {
+       /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
+       * we must recompile any applications that use any older library version.
+       * For versions after libpng 1.0, we will be compatible, so we need
+       * only check the first digit.
+       */
+      if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
+          (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
+          (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
+      {
 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
-        char msg[80];
-        if (user_png_ver)
-        {
-          png_snprintf(msg, 80,
-             "Application was compiled with png.h from libpng-%.20s",
-             user_png_ver);
-          png_warning(png_ptr, msg);
-        }
-        png_snprintf(msg, 80,
+         char msg[80];
+         if (user_png_ver)
+         {
+           png_snprintf(msg, 80,
+              "Application was compiled with png.h from libpng-%.20s",
+              user_png_ver);
+           png_warning(png_ptr, msg);
+         }
+         png_snprintf(msg, 80,
              "Application  is  running with png.c from libpng-%.20s",
-           png_libpng_ver);
-        png_warning(png_ptr, msg);
+             png_libpng_ver);
+         png_warning(png_ptr, msg);
 #endif
 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
-        png_ptr->flags = 0;
+         png_ptr->flags = 0;
 #endif
-        png_error(png_ptr,
-           "Incompatible libpng version in application and library");
-     }
+         png_error(png_ptr,
+            "Incompatible libpng version in application and library");
+      }
    }
 
    /* Initialize zbuf - compression buffer */
@@ -148,14 +150,17 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
    png_ptr->zstream.zfree = png_zfree;
    png_ptr->zstream.opaque = (voidpf)png_ptr;
 
-   switch (inflateInit(&png_ptr->zstream))
-   {
-     case Z_OK: /* Do nothing */ break;
-     case Z_MEM_ERROR:
-     case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory error"); break;
-     case Z_VERSION_ERROR: png_error(png_ptr, "zlib version error"); break;
-     default: png_error(png_ptr, "Unknown zlib error");
-   }
+      switch (inflateInit(&png_ptr->zstream))
+      {
+         case Z_OK: /* Do nothing */ break;
+         case Z_MEM_ERROR:
+         case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory error");
+            break;
+         case Z_VERSION_ERROR: png_error(png_ptr, "zlib version error");
+            break;
+         default: png_error(png_ptr, "Unknown zlib error");
+      }
+
 
    png_ptr->zstream.next_out = png_ptr->zbuf;
    png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
@@ -163,25 +168,27 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
    png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL);
 
 #ifdef PNG_SETJMP_SUPPORTED
-/* Applications that neglect to set up their own setjmp() and then encounter
-   a png_error() will longjmp here.  Since the jmpbuf is then meaningless we
-   abort instead of returning. */
+/* Applications that neglect to set up their own setjmp() and then
+   encounter a png_error() will longjmp here.  Since the jmpbuf is
+   then meaningless we abort instead of returning. */
 #ifdef USE_FAR_KEYWORD
    if (setjmp(jmpbuf))
-      PNG_ABORT();
+       PNG_ABORT();
    png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
 #else
    if (setjmp(png_ptr->jmpbuf))
-      PNG_ABORT();
-#endif
+       PNG_ABORT();
 #endif
+#endif /* PNG_SETJMP_SUPPORTED */
+
    return (png_ptr);
 }
 
 #if defined(PNG_1_0_X) || defined(PNG_1_2_X)
 /* Initialize PNG structure for reading, and allocate any memory needed.
-   This interface is deprecated in favour of the png_create_read_struct(),
-   and it will disappear as of libpng-1.3.0. */
+ * This interface is deprecated in favour of the png_create_read_struct(),
+ * and it will disappear as of libpng-1.3.0.
+ */
 #undef png_read_init
 void PNGAPI
 png_read_init(png_structp png_ptr)
@@ -217,23 +224,23 @@ png_read_init_2(png_structp png_ptr, png_const_charp user_png_ver,
    }
 #endif
    if (png_sizeof(png_struct) > png_struct_size)
-     {
-       png_ptr->error_fn = NULL;
+   {
+      png_ptr->error_fn = NULL;
 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
-       png_ptr->flags = 0;
+      png_ptr->flags = 0;
 #endif
-       png_error(png_ptr,
-       "The png struct allocated by the application for reading is too small.");
-     }
+      png_error(png_ptr,
+      "The png struct allocated by the application for reading is too small.");
+   }
    if (png_sizeof(png_info) > png_info_size)
-     {
-       png_ptr->error_fn = NULL;
+   {
+      png_ptr->error_fn = NULL;
 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
-       png_ptr->flags = 0;
+      png_ptr->flags = 0;
 #endif
-       png_error(png_ptr,
-         "The info struct allocated by application for reading is too small.");
-     }
+      png_error(png_ptr,
+        "The info struct allocated by application for reading is too small.");
+   }
    png_read_init_3(&png_ptr, user_png_ver, png_struct_size);
 }
 #endif /* PNG_1_0_X || PNG_1_2_X */
@@ -255,17 +262,17 @@ png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
 
    do
    {
-     if (user_png_ver[i] != png_libpng_ver[i])
-     {
+      if (user_png_ver[i] != png_libpng_ver[i])
+      {
 #ifdef PNG_LEGACY_SUPPORTED
-       png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
+        png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
 #else
-       png_ptr->warning_fn = NULL;
-       png_warning(png_ptr,
-        "Application uses deprecated png_read_init() and should be recompiled.");
-       break;
+        png_ptr->warning_fn = NULL;
+        png_warning(png_ptr,
+         "Application uses deprecated png_read_init() and should be recompiled.");
+        break;
 #endif
-     }
+      }
    } while (png_libpng_ver[i++]);
 
    png_debug(1, "in png_read_init_3");
@@ -298,6 +305,7 @@ png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
 
    /* Initialize zbuf - compression buffer */
    png_ptr->zbuf_size = PNG_ZBUF_SIZE;
+   png_ptr->zstream.zalloc = png_zalloc;
    png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
      (png_uint_32)png_ptr->zbuf_size);
    png_ptr->zstream.zalloc = png_zalloc;
@@ -306,11 +314,10 @@ png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
 
    switch (inflateInit(&png_ptr->zstream))
    {
-     case Z_OK: /* Do nothing */ break;
-     case Z_MEM_ERROR:
-     case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory"); break;
-     case Z_VERSION_ERROR: png_error(png_ptr, "zlib version"); break;
-     default: png_error(png_ptr, "Unknown zlib error");
+      case Z_OK: /* Do nothing */ break;
+      case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory error"); break;
+      case Z_VERSION_ERROR: png_error(png_ptr, "zlib version error"); break;
+      default: png_error(png_ptr, "Unknown zlib error");
    }
 
    png_ptr->zstream.next_out = png_ptr->zbuf;
@@ -319,7 +326,7 @@ png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
    png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL);
 }
 
-#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
+#ifndef PNG_NO_SEQUENTIAL_READ
 /* Read the information before the actual image data.  This has been
  * changed in v0.90 to allow reading a file that already has the magic
  * bytes read from the stream.  You can tell libpng how many bytes have
@@ -331,9 +338,11 @@ png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
 void PNGAPI
 png_read_info(png_structp png_ptr, png_infop info_ptr)
 {
+   png_debug(1, "in png_read_info");
+ 
    if (png_ptr == NULL || info_ptr == NULL)
       return;
-   png_debug(1, "in png_read_info");
+ 
    /* If we haven't checked all of the PNG signature bytes, do so now. */
    if (png_ptr->sig_bytes < 8)
    {
@@ -357,63 +366,61 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
 
    for (;;)
    {
-#ifdef PNG_USE_LOCAL_ARRAYS
-      PNG_CONST PNG_IHDR;
-      PNG_CONST PNG_IDAT;
-      PNG_CONST PNG_IEND;
-      PNG_CONST PNG_PLTE;
-#if defined(PNG_READ_bKGD_SUPPORTED)
-      PNG_CONST PNG_bKGD;
+      PNG_IHDR;
+      PNG_IDAT;
+      PNG_IEND;
+      PNG_PLTE;
+#ifdef PNG_READ_bKGD_SUPPORTED
+      PNG_bKGD;
 #endif
-#if defined(PNG_READ_cHRM_SUPPORTED)
-      PNG_CONST PNG_cHRM;
+#ifdef PNG_READ_cHRM_SUPPORTED
+      PNG_cHRM;
 #endif
-#if defined(PNG_READ_gAMA_SUPPORTED)
-      PNG_CONST PNG_gAMA;
+#ifdef PNG_READ_gAMA_SUPPORTED
+      PNG_gAMA;
 #endif
-#if defined(PNG_READ_hIST_SUPPORTED)
-      PNG_CONST PNG_hIST;
+#ifdef PNG_READ_hIST_SUPPORTED
+      PNG_hIST;
 #endif
-#if defined(PNG_READ_iCCP_SUPPORTED)
-      PNG_CONST PNG_iCCP;
+#ifdef PNG_READ_iCCP_SUPPORTED
+      PNG_iCCP;
 #endif
-#if defined(PNG_READ_iTXt_SUPPORTED)
-      PNG_CONST PNG_iTXt;
+#ifdef PNG_READ_iTXt_SUPPORTED
+      PNG_iTXt;
 #endif
-#if defined(PNG_READ_oFFs_SUPPORTED)
-      PNG_CONST PNG_oFFs;
+#ifdef PNG_READ_oFFs_SUPPORTED
+      PNG_oFFs;
 #endif
-#if defined(PNG_READ_pCAL_SUPPORTED)
-      PNG_CONST PNG_pCAL;
+#ifdef PNG_READ_pCAL_SUPPORTED
+      PNG_pCAL;
 #endif
-#if defined(PNG_READ_pHYs_SUPPORTED)
-      PNG_CONST PNG_pHYs;
+#ifdef PNG_READ_pHYs_SUPPORTED
+      PNG_pHYs;
 #endif
-#if defined(PNG_READ_sBIT_SUPPORTED)
-      PNG_CONST PNG_sBIT;
+#ifdef PNG_READ_sBIT_SUPPORTED
+      PNG_sBIT;
 #endif
-#if defined(PNG_READ_sCAL_SUPPORTED)
-      PNG_CONST PNG_sCAL;
+#ifdef PNG_READ_sCAL_SUPPORTED
+      PNG_sCAL;
 #endif
-#if defined(PNG_READ_sPLT_SUPPORTED)
-      PNG_CONST PNG_sPLT;
+#ifdef PNG_READ_sPLT_SUPPORTED
+      PNG_sPLT;
 #endif
-#if defined(PNG_READ_sRGB_SUPPORTED)
-      PNG_CONST PNG_sRGB;
+#ifdef PNG_READ_sRGB_SUPPORTED
+      PNG_sRGB;
 #endif
-#if defined(PNG_READ_tEXt_SUPPORTED)
-      PNG_CONST PNG_tEXt;
+#ifdef PNG_READ_tEXt_SUPPORTED
+      PNG_tEXt;
 #endif
-#if defined(PNG_READ_tIME_SUPPORTED)
-      PNG_CONST PNG_tIME;
+#ifdef PNG_READ_tIME_SUPPORTED
+      PNG_tIME;
 #endif
-#if defined(PNG_READ_tRNS_SUPPORTED)
-      PNG_CONST PNG_tRNS;
+#ifdef PNG_READ_tRNS_SUPPORTED
+      PNG_tRNS;
 #endif
-#if defined(PNG_READ_zTXt_SUPPORTED)
-      PNG_CONST PNG_zTXt;
+#ifdef PNG_READ_zTXt_SUPPORTED
+      PNG_zTXt;
 #endif
-#endif /* PNG_USE_LOCAL_ARRAYS */
       png_uint_32 length = png_read_chunk_header(png_ptr);
       PNG_CONST png_bytep chunk_name = png_ptr->chunk_name;
 
@@ -461,71 +468,71 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
          png_ptr->mode |= PNG_HAVE_IDAT;
          break;
       }
-#if defined(PNG_READ_bKGD_SUPPORTED)
+#ifdef PNG_READ_bKGD_SUPPORTED
       else if (!png_memcmp(chunk_name, png_bKGD, 4))
          png_handle_bKGD(png_ptr, info_ptr, length);
 #endif
-#if defined(PNG_READ_cHRM_SUPPORTED)
+#ifdef PNG_READ_cHRM_SUPPORTED
       else if (!png_memcmp(chunk_name, png_cHRM, 4))
          png_handle_cHRM(png_ptr, info_ptr, length);
 #endif
-#if defined(PNG_READ_gAMA_SUPPORTED)
+#ifdef PNG_READ_gAMA_SUPPORTED
       else if (!png_memcmp(chunk_name, png_gAMA, 4))
          png_handle_gAMA(png_ptr, info_ptr, length);
 #endif
-#if defined(PNG_READ_hIST_SUPPORTED)
+#ifdef PNG_READ_hIST_SUPPORTED
       else if (!png_memcmp(chunk_name, png_hIST, 4))
          png_handle_hIST(png_ptr, info_ptr, length);
 #endif
-#if defined(PNG_READ_oFFs_SUPPORTED)
+#ifdef PNG_READ_oFFs_SUPPORTED
       else if (!png_memcmp(chunk_name, png_oFFs, 4))
          png_handle_oFFs(png_ptr, info_ptr, length);
 #endif
-#if defined(PNG_READ_pCAL_SUPPORTED)
+#ifdef PNG_READ_pCAL_SUPPORTED
       else if (!png_memcmp(chunk_name, png_pCAL, 4))
          png_handle_pCAL(png_ptr, info_ptr, length);
 #endif
-#if defined(PNG_READ_sCAL_SUPPORTED)
+#ifdef PNG_READ_sCAL_SUPPORTED
       else if (!png_memcmp(chunk_name, png_sCAL, 4))
          png_handle_sCAL(png_ptr, info_ptr, length);
 #endif
-#if defined(PNG_READ_pHYs_SUPPORTED)
+#ifdef PNG_READ_pHYs_SUPPORTED
       else if (!png_memcmp(chunk_name, png_pHYs, 4))
          png_handle_pHYs(png_ptr, info_ptr, length);
 #endif
-#if defined(PNG_READ_sBIT_SUPPORTED)
+#ifdef PNG_READ_sBIT_SUPPORTED
       else if (!png_memcmp(chunk_name, png_sBIT, 4))
          png_handle_sBIT(png_ptr, info_ptr, length);
 #endif
-#if defined(PNG_READ_sRGB_SUPPORTED)
+#ifdef PNG_READ_sRGB_SUPPORTED
       else if (!png_memcmp(chunk_name, png_sRGB, 4))
          png_handle_sRGB(png_ptr, info_ptr, length);
 #endif
-#if defined(PNG_READ_iCCP_SUPPORTED)
+#ifdef PNG_READ_iCCP_SUPPORTED
       else if (!png_memcmp(chunk_name, png_iCCP, 4))
          png_handle_iCCP(png_ptr, info_ptr, length);
 #endif
-#if defined(PNG_READ_sPLT_SUPPORTED)
+#ifdef PNG_READ_sPLT_SUPPORTED
       else if (!png_memcmp(chunk_name, png_sPLT, 4))
          png_handle_sPLT(png_ptr, info_ptr, length);
 #endif
-#if defined(PNG_READ_tEXt_SUPPORTED)
+#ifdef PNG_READ_tEXt_SUPPORTED
       else if (!png_memcmp(chunk_name, png_tEXt, 4))
          png_handle_tEXt(png_ptr, info_ptr, length);
 #endif
-#if defined(PNG_READ_tIME_SUPPORTED)
+#ifdef PNG_READ_tIME_SUPPORTED
       else if (!png_memcmp(chunk_name, png_tIME, 4))
          png_handle_tIME(png_ptr, info_ptr, length);
 #endif
-#if defined(PNG_READ_tRNS_SUPPORTED)
+#ifdef PNG_READ_tRNS_SUPPORTED
       else if (!png_memcmp(chunk_name, png_tRNS, 4))
          png_handle_tRNS(png_ptr, info_ptr, length);
 #endif
-#if defined(PNG_READ_zTXt_SUPPORTED)
+#ifdef PNG_READ_zTXt_SUPPORTED
       else if (!png_memcmp(chunk_name, png_zTXt, 4))
          png_handle_zTXt(png_ptr, info_ptr, length);
 #endif
-#if defined(PNG_READ_iTXt_SUPPORTED)
+#ifdef PNG_READ_iTXt_SUPPORTED
       else if (!png_memcmp(chunk_name, png_iTXt, 4))
          png_handle_iTXt(png_ptr, info_ptr, length);
 #endif
@@ -533,13 +540,14 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
          png_handle_unknown(png_ptr, info_ptr, length);
    }
 }
-#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
+#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */
 
 /* Optional call to update the users info_ptr structure */
 void PNGAPI
 png_read_update_info(png_structp png_ptr, png_infop info_ptr)
 {
    png_debug(1, "in png_read_update_info");
+ 
    if (png_ptr == NULL)
       return;
    if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
@@ -550,7 +558,7 @@ png_read_update_info(png_structp png_ptr, png_infop info_ptr)
    png_read_transform_info(png_ptr, info_ptr);
 }
 
-#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
+#ifndef PNG_NO_SEQUENTIAL_READ
 /* Initialize palette, background, etc, after transformations
  * are set, but before any reading takes place.  This allows
  * the user to obtain a gamma-corrected palette, for example.
@@ -560,28 +568,30 @@ void PNGAPI
 png_start_read_image(png_structp png_ptr)
 {
    png_debug(1, "in png_start_read_image");
+ 
    if (png_ptr == NULL)
       return;
    if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
       png_read_start_row(png_ptr);
 }
-#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
+#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */
 
-#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
+#ifndef PNG_NO_SEQUENTIAL_READ
 void PNGAPI
 png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
 {
-#ifdef PNG_USE_LOCAL_ARRAYS
-   PNG_CONST PNG_IDAT;
+   PNG_IDAT;
    PNG_CONST int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55,
       0xff};
    PNG_CONST int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
-#endif
    int ret;
+ 
    if (png_ptr == NULL)
       return;
+ 
    png_debug2(1, "in png_read_row (row %lu, pass %d)",
       png_ptr->row_number, png_ptr->pass);
+
    if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
       png_read_start_row(png_ptr);
    if (png_ptr->row_number == 0 && png_ptr->pass == 0)
@@ -617,7 +627,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
 #endif
    }
 
-#if defined(PNG_READ_INTERLACING_SUPPORTED)
+#ifdef PNG_READ_INTERLACING_SUPPORTED
    /* If interlaced and we do not need a new row, combine row and return */
    if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
    {
@@ -751,7 +761,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
    png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf,
       png_ptr->rowbytes + 1);
 
-#if defined(PNG_MNG_FEATURES_SUPPORTED)
+#ifdef PNG_MNG_FEATURES_SUPPORTED
    if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
       (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
    {
@@ -764,7 +774,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
    if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA))
       png_do_read_transformations(png_ptr);
 
-#if defined(PNG_READ_INTERLACING_SUPPORTED)
+#ifdef PNG_READ_INTERLACING_SUPPORTED
    /* Blow up interlaced rows to full size */
    if (png_ptr->interlaced &&
       (png_ptr->transformations & PNG_INTERLACE))
@@ -796,9 +806,9 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
    if (png_ptr->read_row_fn != NULL)
       (*(png_ptr->read_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
 }
-#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
+#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */
 
-#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
+#ifndef PNG_NO_SEQUENTIAL_READ
 /* Read one or more rows of image data.  If the image is interlaced,
  * and png_set_interlace_handling() has been called, the rows need to
  * contain the contents of the rows from the previous pass.  If the
@@ -832,6 +842,7 @@ png_read_rows(png_structp png_ptr, png_bytepp row,
    png_bytepp dp;
 
    png_debug(1, "in png_read_rows");
+ 
    if (png_ptr == NULL)
       return;
    rp = row;
@@ -859,9 +870,9 @@ png_read_rows(png_structp png_ptr, png_bytepp row,
          dp++;
       }
 }
-#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
+#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */
 
-#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
+#ifndef PNG_NO_SEQUENTIAL_READ
 /* Read the entire image.  If the image has an alpha channel or a tRNS
  * chunk, and you have called png_handle_alpha()[*], you will need to
  * initialize the image to the current image that PNG will be overlaying.
@@ -882,6 +893,7 @@ png_read_image(png_structp png_ptr, png_bytepp image)
    png_bytepp rp;
 
    png_debug(1, "in png_read_image");
+ 
    if (png_ptr == NULL)
       return;
 
@@ -908,9 +920,9 @@ png_read_image(png_structp png_ptr, png_bytepp image)
       }
    }
 }
-#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
+#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */
 
-#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
+#ifndef PNG_NO_SEQUENTIAL_READ
 /* Read the end of the PNG file.  Will not read past the end of the
  * file, will verify the end is accurate, and will read any comments
  * or time information at the end of the file, if info is not NULL.
@@ -919,69 +931,68 @@ void PNGAPI
 png_read_end(png_structp png_ptr, png_infop info_ptr)
 {
    png_debug(1, "in png_read_end");
+ 
    if (png_ptr == NULL)
       return;
    png_crc_finish(png_ptr, 0); /* Finish off CRC from last IDAT chunk */
 
    do
    {
-#ifdef PNG_USE_LOCAL_ARRAYS
-      PNG_CONST PNG_IHDR;
-      PNG_CONST PNG_IDAT;
-      PNG_CONST PNG_IEND;
-      PNG_CONST PNG_PLTE;
-#if defined(PNG_READ_bKGD_SUPPORTED)
-      PNG_CONST PNG_bKGD;
+      PNG_IHDR;
+      PNG_IDAT;
+      PNG_IEND;
+      PNG_PLTE;
+#ifdef PNG_READ_bKGD_SUPPORTED
+      PNG_bKGD;
 #endif
-#if defined(PNG_READ_cHRM_SUPPORTED)
-      PNG_CONST PNG_cHRM;
+#ifdef PNG_READ_cHRM_SUPPORTED
+      PNG_cHRM;
 #endif
-#if defined(PNG_READ_gAMA_SUPPORTED)
-      PNG_CONST PNG_gAMA;
+#ifdef PNG_READ_gAMA_SUPPORTED
+      PNG_gAMA;
 #endif
-#if defined(PNG_READ_hIST_SUPPORTED)
-      PNG_CONST PNG_hIST;
+#ifdef PNG_READ_hIST_SUPPORTED
+      PNG_hIST;
 #endif
-#if defined(PNG_READ_iCCP_SUPPORTED)
-      PNG_CONST PNG_iCCP;
+#ifdef PNG_READ_iCCP_SUPPORTED
+      PNG_iCCP;
 #endif
-#if defined(PNG_READ_iTXt_SUPPORTED)
-      PNG_CONST PNG_iTXt;
+#ifdef PNG_READ_iTXt_SUPPORTED
+      PNG_iTXt;
 #endif
-#if defined(PNG_READ_oFFs_SUPPORTED)
-      PNG_CONST PNG_oFFs;
+#ifdef PNG_READ_oFFs_SUPPORTED
+      PNG_oFFs;
 #endif
-#if defined(PNG_READ_pCAL_SUPPORTED)
-      PNG_CONST PNG_pCAL;
+#ifdef PNG_READ_pCAL_SUPPORTED
+      PNG_pCAL;
 #endif
-#if defined(PNG_READ_pHYs_SUPPORTED)
-      PNG_CONST PNG_pHYs;
+#ifdef PNG_READ_pHYs_SUPPORTED
+      PNG_pHYs;
 #endif
-#if defined(PNG_READ_sBIT_SUPPORTED)
-      PNG_CONST PNG_sBIT;
+#ifdef PNG_READ_sBIT_SUPPORTED
+      PNG_sBIT;
 #endif
-#if defined(PNG_READ_sCAL_SUPPORTED)
-      PNG_CONST PNG_sCAL;
+#ifdef PNG_READ_sCAL_SUPPORTED
+      PNG_sCAL;
 #endif
-#if defined(PNG_READ_sPLT_SUPPORTED)
-      PNG_CONST PNG_sPLT;
+#ifdef PNG_READ_sPLT_SUPPORTED
+      PNG_sPLT;
 #endif
-#if defined(PNG_READ_sRGB_SUPPORTED)
-      PNG_CONST PNG_sRGB;
+#ifdef PNG_READ_sRGB_SUPPORTED
+      PNG_sRGB;
 #endif
-#if defined(PNG_READ_tEXt_SUPPORTED)
-      PNG_CONST PNG_tEXt;
+#ifdef PNG_READ_tEXt_SUPPORTED
+      PNG_tEXt;
 #endif
-#if defined(PNG_READ_tIME_SUPPORTED)
-      PNG_CONST PNG_tIME;
+#ifdef PNG_READ_tIME_SUPPORTED
+      PNG_tIME;
 #endif
-#if defined(PNG_READ_tRNS_SUPPORTED)
-      PNG_CONST PNG_tRNS;
+#ifdef PNG_READ_tRNS_SUPPORTED
+      PNG_tRNS;
 #endif
-#if defined(PNG_READ_zTXt_SUPPORTED)
-      PNG_CONST PNG_zTXt;
+#ifdef PNG_READ_zTXt_SUPPORTED
+      PNG_zTXt;
 #endif
-#endif /* PNG_USE_LOCAL_ARRAYS */
       png_uint_32 length = png_read_chunk_header(png_ptr);
       PNG_CONST png_bytep chunk_name = png_ptr->chunk_name;
 
@@ -1013,71 +1024,71 @@ png_read_end(png_structp png_ptr, png_infop info_ptr)
       }
       else if (!png_memcmp(chunk_name, png_PLTE, 4))
          png_handle_PLTE(png_ptr, info_ptr, length);
-#if defined(PNG_READ_bKGD_SUPPORTED)
+#ifdef PNG_READ_bKGD_SUPPORTED
       else if (!png_memcmp(chunk_name, png_bKGD, 4))
          png_handle_bKGD(png_ptr, info_ptr, length);
 #endif
-#if defined(PNG_READ_cHRM_SUPPORTED)
+#ifdef PNG_READ_cHRM_SUPPORTED
       else if (!png_memcmp(chunk_name, png_cHRM, 4))
          png_handle_cHRM(png_ptr, info_ptr, length);
 #endif
-#if defined(PNG_READ_gAMA_SUPPORTED)
+#ifdef PNG_READ_gAMA_SUPPORTED
       else if (!png_memcmp(chunk_name, png_gAMA, 4))
          png_handle_gAMA(png_ptr, info_ptr, length);
 #endif
-#if defined(PNG_READ_hIST_SUPPORTED)
+#ifdef PNG_READ_hIST_SUPPORTED
       else if (!png_memcmp(chunk_name, png_hIST, 4))
          png_handle_hIST(png_ptr, info_ptr, length);
 #endif
-#if defined(PNG_READ_oFFs_SUPPORTED)
+#ifdef PNG_READ_oFFs_SUPPORTED
       else if (!png_memcmp(chunk_name, png_oFFs, 4))
          png_handle_oFFs(png_ptr, info_ptr, length);
 #endif
-#if defined(PNG_READ_pCAL_SUPPORTED)
+#ifdef PNG_READ_pCAL_SUPPORTED
       else if (!png_memcmp(chunk_name, png_pCAL, 4))
          png_handle_pCAL(png_ptr, info_ptr, length);
 #endif
-#if defined(PNG_READ_sCAL_SUPPORTED)
+#ifdef PNG_READ_sCAL_SUPPORTED
       else if (!png_memcmp(chunk_name, png_sCAL, 4))
          png_handle_sCAL(png_ptr, info_ptr, length);
 #endif
-#if defined(PNG_READ_pHYs_SUPPORTED)
+#ifdef PNG_READ_pHYs_SUPPORTED
       else if (!png_memcmp(chunk_name, png_pHYs, 4))
          png_handle_pHYs(png_ptr, info_ptr, length);
 #endif
-#if defined(PNG_READ_sBIT_SUPPORTED)
+#ifdef PNG_READ_sBIT_SUPPORTED
       else if (!png_memcmp(chunk_name, png_sBIT, 4))
          png_handle_sBIT(png_ptr, info_ptr, length);
 #endif
-#if defined(PNG_READ_sRGB_SUPPORTED)
+#ifdef PNG_READ_sRGB_SUPPORTED
       else if (!png_memcmp(chunk_name, png_sRGB, 4))
          png_handle_sRGB(png_ptr, info_ptr, length);
 #endif
-#if defined(PNG_READ_iCCP_SUPPORTED)
+#ifdef PNG_READ_iCCP_SUPPORTED
       else if (!png_memcmp(chunk_name, png_iCCP, 4))
          png_handle_iCCP(png_ptr, info_ptr, length);
 #endif
-#if defined(PNG_READ_sPLT_SUPPORTED)
+#ifdef PNG_READ_sPLT_SUPPORTED
       else if (!png_memcmp(chunk_name, png_sPLT, 4))
          png_handle_sPLT(png_ptr, info_ptr, length);
 #endif
-#if defined(PNG_READ_tEXt_SUPPORTED)
+#ifdef PNG_READ_tEXt_SUPPORTED
       else if (!png_memcmp(chunk_name, png_tEXt, 4))
          png_handle_tEXt(png_ptr, info_ptr, length);
 #endif
-#if defined(PNG_READ_tIME_SUPPORTED)
+#ifdef PNG_READ_tIME_SUPPORTED
       else if (!png_memcmp(chunk_name, png_tIME, 4))
          png_handle_tIME(png_ptr, info_ptr, length);
 #endif
-#if defined(PNG_READ_tRNS_SUPPORTED)
+#ifdef PNG_READ_tRNS_SUPPORTED
       else if (!png_memcmp(chunk_name, png_tRNS, 4))
          png_handle_tRNS(png_ptr, info_ptr, length);
 #endif
-#if defined(PNG_READ_zTXt_SUPPORTED)
+#ifdef PNG_READ_zTXt_SUPPORTED
       else if (!png_memcmp(chunk_name, png_zTXt, 4))
          png_handle_zTXt(png_ptr, info_ptr, length);
 #endif
-#if defined(PNG_READ_iTXt_SUPPORTED)
+#ifdef PNG_READ_iTXt_SUPPORTED
       else if (!png_memcmp(chunk_name, png_iTXt, 4))
          png_handle_iTXt(png_ptr, info_ptr, length);
 #endif
@@ -1085,7 +1096,7 @@ png_read_end(png_structp png_ptr, png_infop info_ptr)
          png_handle_unknown(png_ptr, info_ptr, length);
    } while (!(png_ptr->mode & PNG_HAVE_IEND));
 }
-#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
+#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */
 
 /* Free all memory used by the read */
 void PNGAPI
@@ -1100,6 +1111,7 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
 #endif
 
    png_debug(1, "in png_destroy_read_struct");
+ 
    if (png_ptr_ptr != NULL)
       png_ptr = *png_ptr_ptr;
    if (png_ptr == NULL)
@@ -1120,7 +1132,7 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
 
    if (info_ptr != NULL)
    {
-#if defined(PNG_TEXT_SUPPORTED)
+#ifdef PNG_TEXT_SUPPORTED
       png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, -1);
 #endif
 
@@ -1135,7 +1147,7 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
 
    if (end_info_ptr != NULL)
    {
-#if defined(PNG_READ_TEXT_SUPPORTED)
+#ifdef PNG_READ_TEXT_SUPPORTED
       png_free_data(png_ptr, end_info_ptr, PNG_FREE_TEXT, -1);
 #endif
 #ifdef PNG_USER_MEM_SUPPORTED
@@ -1174,6 +1186,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
 #endif
 
    png_debug(1, "in png_read_destroy");
+ 
    if (info_ptr != NULL)
       png_info_destroy(png_ptr, info_ptr);
 
@@ -1184,14 +1197,14 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
    png_free(png_ptr, png_ptr->big_row_buf);
    png_free(png_ptr, png_ptr->prev_row);
    png_free(png_ptr, png_ptr->chunkdata);
-#if defined(PNG_READ_DITHER_SUPPORTED)
+#ifdef PNG_READ_DITHER_SUPPORTED
    png_free(png_ptr, png_ptr->palette_lookup);
    png_free(png_ptr, png_ptr->dither_index);
 #endif
-#if defined(PNG_READ_GAMMA_SUPPORTED)
+#ifdef PNG_READ_GAMMA_SUPPORTED
    png_free(png_ptr, png_ptr->gamma_table);
 #endif
-#if defined(PNG_READ_BACKGROUND_SUPPORTED)
+#ifdef PNG_READ_BACKGROUND_SUPPORTED
    png_free(png_ptr, png_ptr->gamma_from_1);
    png_free(png_ptr, png_ptr->gamma_to_1);
 #endif
@@ -1216,7 +1229,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
    png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
 #endif
 #endif
-#if defined(PNG_READ_hIST_SUPPORTED)
+#ifdef PNG_READ_hIST_SUPPORTED
 #ifdef PNG_FREE_ME_SUPPORTED
    if (png_ptr->free_me & PNG_FREE_HIST)
       png_free(png_ptr, png_ptr->hist);
@@ -1227,7 +1240,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
    png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
 #endif
 #endif
-#if defined(PNG_READ_GAMMA_SUPPORTED)
+#ifdef PNG_READ_GAMMA_SUPPORTED
    if (png_ptr->gamma_16_table != NULL)
    {
       int i;
@@ -1238,7 +1251,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
       }
    png_free(png_ptr, png_ptr->gamma_16_table);
    }
-#if defined(PNG_READ_BACKGROUND_SUPPORTED)
+#ifdef PNG_READ_BACKGROUND_SUPPORTED
    if (png_ptr->gamma_16_from_1 != NULL)
    {
       int i;
@@ -1261,7 +1274,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
    }
 #endif
 #endif
-#if defined(PNG_TIME_RFC1123_SUPPORTED)
+#ifdef PNG_TIME_RFC1123_SUPPORTED
    png_free(png_ptr, png_ptr->time_buffer);
 #endif
 
@@ -1314,8 +1327,8 @@ png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn)
 }
 
 
-#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
-#if defined(PNG_INFO_IMAGE_SUPPORTED)
+#ifndef PNG_NO_SEQUENTIAL_READ
+#ifdef PNG_INFO_IMAGE_SUPPORTED
 void PNGAPI
 png_read_png(png_structp png_ptr, png_infop info_ptr,
                            int transforms,
@@ -1325,7 +1338,7 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
 
    if (png_ptr == NULL)
       return;
-#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
+#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
    /* Invert the alpha channel from opacity to transparency
     */
    if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
@@ -1341,14 +1354,14 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
 
    /* -------------- image transformations start here ------------------- */
 
-#if defined(PNG_READ_16_TO_8_SUPPORTED)
+#ifdef PNG_READ_16_TO_8_SUPPORTED
    /* Tell libpng to strip 16 bit/color files down to 8 bits per color.
     */
    if (transforms & PNG_TRANSFORM_STRIP_16)
       png_set_strip_16(png_ptr);
 #endif
 
-#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
+#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
    /* Strip alpha bytes from the input data without combining with
     * the background (not recommended).
     */
@@ -1364,7 +1377,7 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
       png_set_packing(png_ptr);
 #endif
 
-#if defined(PNG_READ_PACKSWAP_SUPPORTED)
+#ifdef PNG_READ_PACKSWAP_SUPPORTED
    /* Change the order of packed pixels to least significant bit first
     * (not useful if you are using png_set_packing).
     */
@@ -1372,7 +1385,7 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
       png_set_packswap(png_ptr);
 #endif
 
-#if defined(PNG_READ_EXPAND_SUPPORTED)
+#ifdef PNG_READ_EXPAND_SUPPORTED
    /* Expand paletted colors into true RGB triplets
     * Expand grayscale images to full 8 bits from 1, 2, or 4 bits/pixel
     * Expand paletted or RGB images with transparency to full alpha
@@ -1388,14 +1401,14 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
    /* We don't handle background color or gamma transformation or dithering.
     */
 
-#if defined(PNG_READ_INVERT_SUPPORTED)
+#ifdef PNG_READ_INVERT_SUPPORTED
    /* Invert monochrome files to have 0 as white and 1 as black
     */
    if (transforms & PNG_TRANSFORM_INVERT_MONO)
       png_set_invert_mono(png_ptr);
 #endif
 
-#if defined(PNG_READ_SHIFT_SUPPORTED)
+#ifdef PNG_READ_SHIFT_SUPPORTED
    /* If you want to shift the pixel values from the range [0,255] or
     * [0,65535] to the original [0,7] or [0,31], or whatever range the
     * colors were originally in:
@@ -1410,21 +1423,21 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
    }
 #endif
 
-#if defined(PNG_READ_BGR_SUPPORTED)
+#ifdef PNG_READ_BGR_SUPPORTED
    /* Flip the RGB pixels to BGR (or RGBA to BGRA)
     */
    if (transforms & PNG_TRANSFORM_BGR)
       png_set_bgr(png_ptr);
 #endif
 
-#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
+#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED
    /* Swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR)
     */
    if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
        png_set_swap_alpha(png_ptr);
 #endif
 
-#if defined(PNG_READ_SWAP_SUPPORTED)
+#ifdef PNG_READ_SWAP_SUPPORTED
    /* Swap bytes of 16 bit files to least significant byte first
     */
    if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
@@ -1450,9 +1463,11 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
          info_ptr->height * png_sizeof(png_bytep));
       png_memset(info_ptr->row_pointers, 0, info_ptr->height
          * png_sizeof(png_bytep));
+
 #ifdef PNG_FREE_ME_SUPPORTED
       info_ptr->free_me |= PNG_FREE_ROWS;
 #endif
+
       for (row = 0; row < (int)info_ptr->height; row++)
          info_ptr->row_pointers[row] = (png_bytep)png_malloc(png_ptr,
             png_get_rowbytes(png_ptr, info_ptr));
@@ -1469,5 +1484,5 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
 
 }
 #endif /* PNG_INFO_IMAGE_SUPPORTED */
-#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
+#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */
 #endif /* PNG_READ_SUPPORTED */