Changeset 44 for cafu/trunk/ExtLibs/libpng/pngread.c

Timestamp:

02/15/10 11:56:43 (2 years ago)

Author:

Carsten

Message:

Merged latest libpng upgrade in vendor/libpng to cafu/trunk/ExtLibs/libpng.

Note that this implements the "Vendor Branches" strategy described in the Subversion book at
 http://svnbook.red-bean.com/nightly/en/svn.branchmerge.basicmerging.html
 http://svnbook.red-bean.com/nightly/en/svn.advanced.vendorbr.html

Files:

• cafu/trunk/ExtLibs/libpng/pngread.c (modified) (57 diffs)

cafu/trunk/ExtLibs/libpng/pngread.c

@@ -2 +2 @@
 /* pngread.c - read a PNG file
  *
- * Last changed in libpng 1.2.37 [June 4, 2009]
+ * Last changed in libpng 1.2.41 [December 3, 2009]
  * Copyright (c) 1998-2009 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -16 +16 @@
 
 #define PNG_INTERNAL
+#define PNG_NO_PEDANTIC_WARNINGS
 #include "png.h"
-#if defined(PNG_READ_SUPPORTED)
+#ifdef PNG_READ_SUPPORTED
+
 
 /* Create a PNG structure for reading, and allocate any memory needed. */
@@ -52 +54 @@
 
    png_debug(1, "in png_create_read_struct");
+
 #ifdef PNG_USER_MEM_SUPPORTED
    png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
@@ -63 +66 @@
    /* Added at libpng-1.2.6 */
 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
-   png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
-   png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
+   png_ptr->user_width_max = PNG_USER_WIDTH_MAX;
+   png_ptr->user_height_max = PNG_USER_HEIGHT_MAX;
 #endif
 
@@ -87 +90 @@
    png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
 #endif
-#endif
+#endif /* PNG_SETJMP_SUPPORTED */
 
 #ifdef PNG_USER_MEM_SUPPORTED
@@ -97 +100 @@
    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;
-
-
-   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,
+      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 defined(PNG_STDIO_SUPPORTED) && !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,
              "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;
-#endif
-        png_error(png_ptr,
-           "Incompatible libpng version in application and library");
-     }
+         png_ptr->flags = 0;
+#endif
+         png_error(png_ptr,
+            "Incompatible libpng version in application and library");
+      }
    }
 
@@ -149 +152 @@
    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;
@@ -164 +170 @@
 
 #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
-#endif
+       PNG_ABORT();
+#endif
+#endif /* PNG_SETJMP_SUPPORTED */
+
    return (png_ptr);
 }
@@ -181 +188 @@
 #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
@@ -198 +206 @@
    if (png_ptr == NULL)
       return;
-#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
+#if defined(PNG_STDIO_SUPPORTED) && !defined(_WIN32_WCE)
    if (png_sizeof(png_struct) > png_struct_size ||
       png_sizeof(png_info) > png_info_size)
@@ -218 +226 @@
 #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;
-#endif
-       png_error(png_ptr,
-       "The png struct allocated by the application for reading is too small.");
-     }
+      png_ptr->flags = 0;
+#endif
+      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;
-#endif
-       png_error(png_ptr,
-         "The info struct allocated by application for reading is too small.");
-     }
+      png_ptr->flags = 0;
+#endif
+      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);
 }
@@ -256 +264 @@
    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;
-#endif
-     }
+        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++]);
 
@@ -293 +301 @@
    /* Added at libpng-1.2.6 */
 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
-   png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
-   png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
+   png_ptr->user_width_max = PNG_USER_WIDTH_MAX;
+   png_ptr->user_height_max = PNG_USER_HEIGHT_MAX;
 #endif
 
    /* 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);
@@ -307 +316 @@
    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");
    }
 
@@ -320 +328 @@
 }
 
-#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
 /* 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
@@ -332 +340 @@
 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)
@@ -363 +373 @@
       PNG_CONST PNG_IEND;
       PNG_CONST PNG_PLTE;
-#if defined(PNG_READ_bKGD_SUPPORTED)
+#ifdef PNG_READ_bKGD_SUPPORTED
       PNG_CONST PNG_bKGD;
 #endif
-#if defined(PNG_READ_cHRM_SUPPORTED)
+#ifdef PNG_READ_cHRM_SUPPORTED
       PNG_CONST PNG_cHRM;
 #endif
-#if defined(PNG_READ_gAMA_SUPPORTED)
+#ifdef PNG_READ_gAMA_SUPPORTED
       PNG_CONST PNG_gAMA;
 #endif
-#if defined(PNG_READ_hIST_SUPPORTED)
+#ifdef PNG_READ_hIST_SUPPORTED
       PNG_CONST PNG_hIST;
 #endif
-#if defined(PNG_READ_iCCP_SUPPORTED)
+#ifdef PNG_READ_iCCP_SUPPORTED
       PNG_CONST PNG_iCCP;
 #endif
-#if defined(PNG_READ_iTXt_SUPPORTED)
+#ifdef PNG_READ_iTXt_SUPPORTED
       PNG_CONST PNG_iTXt;
 #endif
-#if defined(PNG_READ_oFFs_SUPPORTED)
+#ifdef PNG_READ_oFFs_SUPPORTED
       PNG_CONST PNG_oFFs;
 #endif
-#if defined(PNG_READ_pCAL_SUPPORTED)
+#ifdef PNG_READ_pCAL_SUPPORTED
       PNG_CONST PNG_pCAL;
 #endif
-#if defined(PNG_READ_pHYs_SUPPORTED)
+#ifdef PNG_READ_pHYs_SUPPORTED
       PNG_CONST PNG_pHYs;
 #endif
-#if defined(PNG_READ_sBIT_SUPPORTED)
+#ifdef PNG_READ_sBIT_SUPPORTED
       PNG_CONST PNG_sBIT;
 #endif
-#if defined(PNG_READ_sCAL_SUPPORTED)
+#ifdef PNG_READ_sCAL_SUPPORTED
       PNG_CONST PNG_sCAL;
 #endif
-#if defined(PNG_READ_sPLT_SUPPORTED)
+#ifdef PNG_READ_sPLT_SUPPORTED
       PNG_CONST PNG_sPLT;
 #endif
-#if defined(PNG_READ_sRGB_SUPPORTED)
+#ifdef PNG_READ_sRGB_SUPPORTED
       PNG_CONST PNG_sRGB;
 #endif
-#if defined(PNG_READ_tEXt_SUPPORTED)
+#ifdef PNG_READ_tEXt_SUPPORTED
       PNG_CONST PNG_tEXt;
 #endif
-#if defined(PNG_READ_tIME_SUPPORTED)
+#ifdef PNG_READ_tIME_SUPPORTED
       PNG_CONST PNG_tIME;
 #endif
-#if defined(PNG_READ_tRNS_SUPPORTED)
+#ifdef PNG_READ_tRNS_SUPPORTED
       PNG_CONST PNG_tRNS;
 #endif
-#if defined(PNG_READ_zTXt_SUPPORTED)
+#ifdef PNG_READ_zTXt_SUPPORTED
       PNG_CONST PNG_zTXt;
 #endif
@@ -462 +472 @@
          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);
@@ -534 +544 @@
    }
 }
-#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
+#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */
 
 /* Optional call to update the users info_ptr structure */
@@ -541 +551 @@
 {
    png_debug(1, "in png_read_update_info");
+ 
    if (png_ptr == NULL)
       return;
@@ -548 +559 @@
       png_warning(png_ptr,
       "Ignoring extra png_read_update_info() call; row buffer not reallocated");
+
    png_read_transform_info(png_ptr, info_ptr);
 }
 
-#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
 /* Initialize palette, background, etc, after transformations
  * are set, but before any reading takes place.  This allows
@@ -561 +573 @@
 {
    png_debug(1, "in png_start_read_image");
+ 
    if (png_ptr == NULL)
       return;
@@ -566 +579 @@
       png_read_start_row(png_ptr);
 }
-#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
-
-#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
+#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */
+
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
 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_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);
@@ -618 +632 @@
    }
 
-#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))
@@ -752 +766 @@
       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))
@@ -765 +779 @@
       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 &&
@@ -797 +811 @@
       (*(png_ptr->read_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
 }
-#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
-
-#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
+#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */
+
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
 /* 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
@@ -833 +847 @@
 
    png_debug(1, "in png_read_rows");
+ 
    if (png_ptr == NULL)
       return;
@@ -860 +875 @@
       }
 }
-#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
-
-#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
+#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */
+
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
 /* 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
@@ -883 +898 @@
 
    png_debug(1, "in png_read_image");
+ 
    if (png_ptr == NULL)
       return;
@@ -909 +925 @@
    }
 }
-#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
-
-#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
+#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */
+
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
 /* 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
@@ -920 +936 @@
 {
    png_debug(1, "in png_read_end");
+ 
    if (png_ptr == NULL)
       return;
@@ -931 +948 @@
       PNG_CONST PNG_IEND;
       PNG_CONST PNG_PLTE;
-#if defined(PNG_READ_bKGD_SUPPORTED)
+#ifdef PNG_READ_bKGD_SUPPORTED
       PNG_CONST PNG_bKGD;
 #endif
-#if defined(PNG_READ_cHRM_SUPPORTED)
+#ifdef PNG_READ_cHRM_SUPPORTED
       PNG_CONST PNG_cHRM;
 #endif
-#if defined(PNG_READ_gAMA_SUPPORTED)
+#ifdef PNG_READ_gAMA_SUPPORTED
       PNG_CONST PNG_gAMA;
 #endif
-#if defined(PNG_READ_hIST_SUPPORTED)
+#ifdef PNG_READ_hIST_SUPPORTED
       PNG_CONST PNG_hIST;
 #endif
-#if defined(PNG_READ_iCCP_SUPPORTED)
+#ifdef PNG_READ_iCCP_SUPPORTED
       PNG_CONST PNG_iCCP;
 #endif
-#if defined(PNG_READ_iTXt_SUPPORTED)
+#ifdef PNG_READ_iTXt_SUPPORTED
       PNG_CONST PNG_iTXt;
 #endif
-#if defined(PNG_READ_oFFs_SUPPORTED)
+#ifdef PNG_READ_oFFs_SUPPORTED
       PNG_CONST PNG_oFFs;
 #endif
-#if defined(PNG_READ_pCAL_SUPPORTED)
+#ifdef PNG_READ_pCAL_SUPPORTED
       PNG_CONST PNG_pCAL;
 #endif
-#if defined(PNG_READ_pHYs_SUPPORTED)
+#ifdef PNG_READ_pHYs_SUPPORTED
       PNG_CONST PNG_pHYs;
 #endif
-#if defined(PNG_READ_sBIT_SUPPORTED)
+#ifdef PNG_READ_sBIT_SUPPORTED
       PNG_CONST PNG_sBIT;
 #endif
-#if defined(PNG_READ_sCAL_SUPPORTED)
+#ifdef PNG_READ_sCAL_SUPPORTED
       PNG_CONST PNG_sCAL;
 #endif
-#if defined(PNG_READ_sPLT_SUPPORTED)
+#ifdef PNG_READ_sPLT_SUPPORTED
       PNG_CONST PNG_sPLT;
 #endif
-#if defined(PNG_READ_sRGB_SUPPORTED)
+#ifdef PNG_READ_sRGB_SUPPORTED
       PNG_CONST PNG_sRGB;
 #endif
-#if defined(PNG_READ_tEXt_SUPPORTED)
+#ifdef PNG_READ_tEXt_SUPPORTED
       PNG_CONST PNG_tEXt;
 #endif
-#if defined(PNG_READ_tIME_SUPPORTED)
+#ifdef PNG_READ_tIME_SUPPORTED
       PNG_CONST PNG_tIME;
 #endif
-#if defined(PNG_READ_tRNS_SUPPORTED)
+#ifdef PNG_READ_tRNS_SUPPORTED
       PNG_CONST PNG_tRNS;
 #endif
-#if defined(PNG_READ_zTXt_SUPPORTED)
+#ifdef PNG_READ_zTXt_SUPPORTED
       PNG_CONST PNG_zTXt;
 #endif
@@ -1014 +1031 @@
       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);
@@ -1086 +1103 @@
    } 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 */
@@ -1101 +1118 @@
 
    png_debug(1, "in png_destroy_read_struct");
+ 
    if (png_ptr_ptr != NULL)
       png_ptr = *png_ptr_ptr;
@@ -1121 +1139 @@
    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
@@ -1136 +1154 @@
    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
@@ -1175 +1193 @@
 
    png_debug(1, "in png_read_destroy");
+ 
    if (info_ptr != NULL)
       png_info_destroy(png_ptr, info_ptr);
@@ -1185 +1204 @@
    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);
@@ -1217 +1236 @@
 #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)
@@ -1228 +1247 @@
 #endif
 #endif
-#if defined(PNG_READ_GAMMA_SUPPORTED)
+#ifdef PNG_READ_GAMMA_SUPPORTED
    if (png_ptr->gamma_16_table != NULL)
    {
@@ -1239 +1258 @@
    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)
    {
@@ -1262 +1281 @@
 #endif
 #endif
-#if defined(PNG_TIME_RFC1123_SUPPORTED)
+#ifdef PNG_TIME_RFC1123_SUPPORTED
    png_free(png_ptr, png_ptr->time_buffer);
 #endif
@@ -1315 +1334 @@
 
 
-#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
-#if defined(PNG_INFO_IMAGE_SUPPORTED)
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
+#ifdef PNG_INFO_IMAGE_SUPPORTED
 void PNGAPI
 png_read_png(png_structp png_ptr, png_infop info_ptr,
@@ -1326 +1345 @@
    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
     */
@@ -1342 +1361 @@
    /* -------------- 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.
     */
@@ -1349 +1368 @@
 #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).
@@ -1365 +1384 @@
 #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).
@@ -1373 +1392 @@
 #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
@@ -1389 +1408 @@
     */
 
-#if defined(PNG_READ_INVERT_SUPPORTED)
+#ifdef PNG_READ_INVERT_SUPPORTED
    /* Invert monochrome files to have 0 as white and 1 as black
     */
@@ -1396 +1415 @@
 #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
@@ -1411 +1430 @@
 #endif
 
-#if defined(PNG_READ_BGR_SUPPORTED)
+#ifdef PNG_READ_BGR_SUPPORTED
    /* Flip the RGB pixels to BGR (or RGBA to BGRA)
     */
@@ -1418 +1437 @@
 #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)
     */
@@ -1425 +1444 @@
 #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)
       png_set_swap(png_ptr);
+#endif
+
+/* Added at libpng-1.2.41 */
+#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
+   /* Invert the alpha channel from opacity to transparency
+    */
+   if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
+       png_set_invert_alpha(png_ptr);
+#endif
+
+/* Added at libpng-1.2.41 */
+#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
+   /* Expand grayscale image to RGB
+    */
+   if (transforms & PNG_TRANSFORM_GRAY_TO_RGB)
+       png_set_gray_to_rgb(png_ptr);
 #endif
 
@@ -1451 +1486 @@
       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,
@@ -1470 +1507 @@
 }
 #endif /* PNG_INFO_IMAGE_SUPPORTED */
-#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
+#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */
 #endif /* PNG_READ_SUPPORTED */