clang-format all pdfium code.

samples/fx_lpng/lpng_v163/pngstruct.h

 
 /* pngstruct.h - header file for PNG reference library
  *
  * Copyright (c) 1998-2013 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.)
  *
  * Last changed in libpng 1.6.1 [March 28, 2013]
  *
  * This code is released under the libpng license.
  * For conditions of distribution and use, see the disclaimer
  * and license in png.h
  */
 
 /* The structure that holds the information to read and write PNG files.
  * The only people who need to care about what is inside of this are the
  * people who will be modifying the library for their own special needs.
  * It should NOT be accessed directly by an application.
  */
 
 #ifndef PNGSTRUCT_H
 #define PNGSTRUCT_H
 /* zlib.h defines the structure z_stream, an instance of which is included
  * in this structure and is required for decompressing the LZ compressed
  * data in PNG files.
  */
 #ifndef ZLIB_CONST
-   /* We must ensure that zlib uses 'const' in declarations. */
-#  define ZLIB_CONST
+/* We must ensure that zlib uses 'const' in declarations. */
+#define ZLIB_CONST
 #endif
 #include "../../../third_party/zlib_v128/zlib.h"
 #ifdef const
-   /* zlib.h sometimes #defines const to nothing, undo this. */
-#  undef const
+/* zlib.h sometimes #defines const to nothing, undo this. */
+#undef const
 #endif
 
 /* zlib.h has mediocre z_const use before 1.2.6, this stuff is for compatibility
  * with older builds.
  */
 #if ZLIB_VERNUM < 0x1260
-#  define PNGZ_MSG_CAST(s) png_constcast(char*,s)
-#  define PNGZ_INPUT_CAST(b) png_constcast(png_bytep,b)
+#define PNGZ_MSG_CAST(s) png_constcast(char*, s)
+#define PNGZ_INPUT_CAST(b) png_constcast(png_bytep, b)
 #else
-#  define PNGZ_MSG_CAST(s) (s)
-#  define PNGZ_INPUT_CAST(b) (b)
+#define PNGZ_MSG_CAST(s) (s)
+#define PNGZ_INPUT_CAST(b) (b)
 #endif
 
 /* zlib.h declares a magic type 'uInt' that limits the amount of data that zlib
  * can handle at once.  This type need be no larger than 16 bits (so maximum of
  * 65535), this define allows us to discover how big it is, but limited by the
  * maximuum for png_size_t.  The value can be overriden in a library build
  * (pngusr.h, or set it in CPPFLAGS) and it works to set it to a considerably
  * lower value (e.g. 255 works).  A lower value may help memory usage (slightly)
  * and may even improve performance on some systems (and degrade it on others.)
  */
 #ifndef ZLIB_IO_MAX
-#  define ZLIB_IO_MAX ((uInt)-1)
+#define ZLIB_IO_MAX ((uInt)-1)
 #endif
 
 #ifdef PNG_WRITE_SUPPORTED
 /* The type of a compression buffer list used by the write code. */
-typedef struct png_compression_buffer
-{
-   struct png_compression_buffer *next;
-   png_byte                       output[1]; /* actually zbuf_size */
+typedef struct png_compression_buffer {
+  struct png_compression_buffer* next;
+  png_byte output[1]; /* actually zbuf_size */
 } png_compression_buffer, *png_compression_bufferp;
 
-#define PNG_COMPRESSION_BUFFER_SIZE(pp)\
-   (offsetof(png_compression_buffer, output) + (pp)->zbuffer_size)
+#define PNG_COMPRESSION_BUFFER_SIZE(pp) \
+  (offsetof(png_compression_buffer, output) + (pp)->zbuffer_size)
 #endif
 
 /* Colorspace support; structures used in png_struct, png_info and in internal
  * functions to hold and communicate information about the color space.
  *
  * PNG_COLORSPACE_SUPPORTED is only required if the application will perform
  * colorspace corrections, otherwise all the colorspace information can be
  * skipped and the size of libpng can be reduced (significantly) by compiling
  * out the colorspace support.
  */
 #ifdef PNG_COLORSPACE_SUPPORTED
 /* The chromaticities of the red, green and blue colorants and the chromaticity
  * of the corresponding white point (i.e. of rgb(1.0,1.0,1.0)).
  */
-typedef struct png_xy
-{
-   png_fixed_point redx, redy;
-   png_fixed_point greenx, greeny;
-   png_fixed_point bluex, bluey;
-   png_fixed_point whitex, whitey;
+typedef struct png_xy {
+  png_fixed_point redx, redy;
+  png_fixed_point greenx, greeny;
+  png_fixed_point bluex, bluey;
+  png_fixed_point whitex, whitey;
 } png_xy;
 
 /* The same data as above but encoded as CIE XYZ values.  When this data comes
  * from chromaticities the sum of the Y values is assumed to be 1.0
  */
-typedef struct png_XYZ
-{
-   png_fixed_point red_X, red_Y, red_Z;
-   png_fixed_point green_X, green_Y, green_Z;
-   png_fixed_point blue_X, blue_Y, blue_Z;
+typedef struct png_XYZ {
+  png_fixed_point red_X, red_Y, red_Z;
+  png_fixed_point green_X, green_Y, green_Z;
+  png_fixed_point blue_X, blue_Y, blue_Z;
 } png_XYZ;
 #endif /* COLORSPACE */
 
 #if defined(PNG_COLORSPACE_SUPPORTED) || defined(PNG_GAMMA_SUPPORTED)
 /* A colorspace is all the above plus, potentially, profile information,
  * however at present libpng does not use the profile internally so it is only
  * stored in the png_info struct (if iCCP is supported.)  The rendering intent
  * is retained here and is checked.
  *
  * The file gamma encoding information is also stored here and gamma correction
  * is done by libpng, whereas color correction must currently be done by the
  * application.
  */
-typedef struct png_colorspace
-{
+typedef struct png_colorspace {
 #ifdef PNG_GAMMA_SUPPORTED
-   png_fixed_point gamma;        /* File gamma */
+  png_fixed_point gamma; /* File gamma */
 #endif
 
 #ifdef PNG_COLORSPACE_SUPPORTED
-   png_xy      end_points_xy;    /* End points as chromaticities */
-   png_XYZ     end_points_XYZ;   /* End points as CIE XYZ colorant values */
-   png_uint_16 rendering_intent; /* Rendering intent of a profile */
-#endif
-
-   /* Flags are always defined to simplify the code. */
-   png_uint_16 flags;            /* As defined below */
-} png_colorspace, * PNG_RESTRICT png_colorspacerp;
-
-typedef const png_colorspace * PNG_RESTRICT png_const_colorspacerp;
+  png_xy end_points_xy;         /* End points as chromaticities */
+  png_XYZ end_points_XYZ;       /* End points as CIE XYZ colorant values */
+  png_uint_16 rendering_intent; /* Rendering intent of a profile */
+#endif
+
+  /* Flags are always defined to simplify the code. */
+  png_uint_16 flags; /* As defined below */
+} png_colorspace, *PNG_RESTRICT png_colorspacerp;
+
+typedef const png_colorspace* PNG_RESTRICT png_const_colorspacerp;
 
 /* General flags for the 'flags' field */
-#define PNG_COLORSPACE_HAVE_GAMMA           0x0001
-#define PNG_COLORSPACE_HAVE_ENDPOINTS       0x0002
-#define PNG_COLORSPACE_HAVE_INTENT          0x0004
-#define PNG_COLORSPACE_FROM_gAMA            0x0008
-#define PNG_COLORSPACE_FROM_cHRM            0x0010
-#define PNG_COLORSPACE_FROM_sRGB            0x0020
+#define PNG_COLORSPACE_HAVE_GAMMA 0x0001
+#define PNG_COLORSPACE_HAVE_ENDPOINTS 0x0002
+#define PNG_COLORSPACE_HAVE_INTENT 0x0004
+#define PNG_COLORSPACE_FROM_gAMA 0x0008
+#define PNG_COLORSPACE_FROM_cHRM 0x0010
+#define PNG_COLORSPACE_FROM_sRGB 0x0020
 #define PNG_COLORSPACE_ENDPOINTS_MATCH_sRGB 0x0040
-#define PNG_COLORSPACE_MATCHES_sRGB         0x0080 /* exact match on profile */
-#define PNG_COLORSPACE_INVALID              0x8000
-#define PNG_COLORSPACE_CANCEL(flags)        (0xffff ^ (flags))
+#define PNG_COLORSPACE_MATCHES_sRGB 0x0080 /* exact match on profile */
+#define PNG_COLORSPACE_INVALID 0x8000
+#define PNG_COLORSPACE_CANCEL(flags) (0xffff ^ (flags))
 #endif /* COLORSPACE || GAMMA */
 
-struct png_struct_def
-{
+struct png_struct_def {
 #ifdef PNG_SETJMP_SUPPORTED
-   jmp_buf jmp_buf_local;     /* New name in 1.6.0 for jmp_buf in png_struct */
-   png_longjmp_ptr longjmp_fn;/* setjmp non-local goto function. */
-   jmp_buf *jmp_buf_ptr;      /* passed to longjmp_fn */
-   size_t jmp_buf_size;       /* size of the above, if allocated */
-#endif
-   png_error_ptr error_fn;    /* function for printing errors and aborting */
+  jmp_buf jmp_buf_local;      /* New name in 1.6.0 for jmp_buf in png_struct */
+  png_longjmp_ptr longjmp_fn; /* setjmp non-local goto function. */
+  jmp_buf* jmp_buf_ptr;       /* passed to longjmp_fn */
+  size_t jmp_buf_size;        /* size of the above, if allocated */
+#endif
+  png_error_ptr error_fn; /* function for printing errors and aborting */
 #ifdef PNG_WARNINGS_SUPPORTED
-   png_error_ptr warning_fn;  /* function for printing warnings */
-#endif
-   png_voidp error_ptr;       /* user supplied struct for error functions */
-   png_rw_ptr write_data_fn;  /* function for writing output data */
-   png_rw_ptr read_data_fn;   /* function for reading input data */
-   png_voidp io_ptr;          /* ptr to application struct for I/O functions */
+  png_error_ptr warning_fn; /* function for printing warnings */
+#endif
+  png_voidp error_ptr;      /* user supplied struct for error functions */
+  png_rw_ptr write_data_fn; /* function for writing output data */
+  png_rw_ptr read_data_fn;  /* function for reading input data */
+  png_voidp io_ptr;         /* ptr to application struct for I/O functions */
 
 #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
-   png_user_transform_ptr read_user_transform_fn; /* user read transform */
+  png_user_transform_ptr read_user_transform_fn; /* user read transform */
 #endif
 
 #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
-   png_user_transform_ptr write_user_transform_fn; /* user write transform */
+  png_user_transform_ptr write_user_transform_fn; /* user write transform */
 #endif
 
 /* These were added in libpng-1.0.2 */
 #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
     defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
-   png_voidp user_transform_ptr; /* user supplied struct for user transform */
-   png_byte user_transform_depth;    /* bit depth of user transformed pixels */
-   png_byte user_transform_channels; /* channels in user transformed pixels */
-#endif
-#endif
-
-   png_uint_32 mode;          /* tells us where we are in the PNG file */
-   png_uint_32 flags;         /* flags indicating various things to libpng */
-   png_uint_32 transformations; /* which transformations to perform */
-
-   png_uint_32 zowner;        /* ID (chunk type) of zstream owner, 0 if none */
-   z_stream    zstream;       /* decompression structure */
+  png_voidp user_transform_ptr;  /* user supplied struct for user transform */
+  png_byte user_transform_depth; /* bit depth of user transformed pixels */
+  png_byte user_transform_channels; /* channels in user transformed pixels */
+#endif
+#endif
+
+  png_uint_32 mode;            /* tells us where we are in the PNG file */
+  png_uint_32 flags;           /* flags indicating various things to libpng */
+  png_uint_32 transformations; /* which transformations to perform */
+
+  png_uint_32 zowner; /* ID (chunk type) of zstream owner, 0 if none */
+  z_stream zstream;   /* decompression structure */
 
 #ifdef PNG_WRITE_SUPPORTED
-   png_compression_bufferp zbuffer_list; /* Created on demand during write */
-   uInt                    zbuffer_size; /* size of the actual buffer */
-
-   int zlib_level;            /* holds zlib compression level */
-   int zlib_method;           /* holds zlib compression method */
-   int zlib_window_bits;      /* holds zlib compression window bits */
-   int zlib_mem_level;        /* holds zlib compression memory level */
-   int zlib_strategy;         /* holds zlib compression strategy */
+  png_compression_bufferp zbuffer_list; /* Created on demand during write */
+  uInt zbuffer_size;                    /* size of the actual buffer */
+
+  int zlib_level;       /* holds zlib compression level */
+  int zlib_method;      /* holds zlib compression method */
+  int zlib_window_bits; /* holds zlib compression window bits */
+  int zlib_mem_level;   /* holds zlib compression memory level */
+  int zlib_strategy;    /* holds zlib compression strategy */
 #endif
 /* Added at libpng 1.5.4 */
 #ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED
-   int zlib_text_level;            /* holds zlib compression level */
-   int zlib_text_method;           /* holds zlib compression method */
-   int zlib_text_window_bits;      /* holds zlib compression window bits */
-   int zlib_text_mem_level;        /* holds zlib compression memory level */
-   int zlib_text_strategy;         /* holds zlib compression strategy */
+  int zlib_text_level;       /* holds zlib compression level */
+  int zlib_text_method;      /* holds zlib compression method */
+  int zlib_text_window_bits; /* holds zlib compression window bits */
+  int zlib_text_mem_level;   /* holds zlib compression memory level */
+  int zlib_text_strategy;    /* holds zlib compression strategy */
 #endif
 /* End of material added at libpng 1.5.4 */
 /* Added at libpng 1.6.0 */
 #ifdef PNG_WRITE_SUPPORTED
-   int zlib_set_level;        /* Actual values set into the zstream on write */
-   int zlib_set_method;
-   int zlib_set_window_bits;
-   int zlib_set_mem_level;
-   int zlib_set_strategy;
-#endif
-
-   png_uint_32 width;         /* width of image in pixels */
-   png_uint_32 height;        /* height of image in pixels */
-   png_uint_32 num_rows;      /* number of rows in current pass */
-   png_uint_32 usr_width;     /* width of row at start of write */
-   png_size_t rowbytes;       /* size of row in bytes */
-   png_uint_32 iwidth;        /* width of current interlaced row in pixels */
-   png_uint_32 row_number;    /* current row in interlace pass */
-   png_uint_32 chunk_name;    /* PNG_CHUNK() id of current chunk */
-   png_bytep prev_row;        /* buffer to save previous (unfiltered) row.
-                               * This is a pointer into big_prev_row
-                               */
-   png_bytep row_buf;         /* buffer to save current (unfiltered) row.
-                               * This is a pointer into big_row_buf
-                               */
+  int zlib_set_level; /* Actual values set into the zstream on write */
+  int zlib_set_method;
+  int zlib_set_window_bits;
+  int zlib_set_mem_level;
+  int zlib_set_strategy;
+#endif
+
+  png_uint_32 width;      /* width of image in pixels */
+  png_uint_32 height;     /* height of image in pixels */
+  png_uint_32 num_rows;   /* number of rows in current pass */
+  png_uint_32 usr_width;  /* width of row at start of write */
+  png_size_t rowbytes;    /* size of row in bytes */
+  png_uint_32 iwidth;     /* width of current interlaced row in pixels */
+  png_uint_32 row_number; /* current row in interlace pass */
+  png_uint_32 chunk_name; /* PNG_CHUNK() id of current chunk */
+  png_bytep prev_row;     /* buffer to save previous (unfiltered) row.
+                           * This is a pointer into big_prev_row
+                           */
+  png_bytep row_buf;      /* buffer to save current (unfiltered) row.
+                           * This is a pointer into big_row_buf
+                           */
 #ifdef PNG_WRITE_SUPPORTED
-   png_bytep sub_row;         /* buffer to save "sub" row when filtering */
-   png_bytep up_row;          /* buffer to save "up" row when filtering */
-   png_bytep avg_row;         /* buffer to save "avg" row when filtering */
-   png_bytep paeth_row;       /* buffer to save "Paeth" row when filtering */
-#endif
-   png_size_t info_rowbytes;  /* Added in 1.5.4: cache of updated row bytes */
-
-   png_uint_32 idat_size;     /* current IDAT size for read */
-   png_uint_32 crc;           /* current chunk CRC value */
-   png_colorp palette;        /* palette from the input file */
-   png_uint_16 num_palette;   /* number of color entries in palette */
+  png_bytep sub_row;   /* buffer to save "sub" row when filtering */
+  png_bytep up_row;    /* buffer to save "up" row when filtering */
+  png_bytep avg_row;   /* buffer to save "avg" row when filtering */
+  png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */
+#endif
+  png_size_t info_rowbytes; /* Added in 1.5.4: cache of updated row bytes */
+
+  png_uint_32 idat_size;   /* current IDAT size for read */
+  png_uint_32 crc;         /* current chunk CRC value */
+  png_colorp palette;      /* palette from the input file */
+  png_uint_16 num_palette; /* number of color entries in palette */
 
 /* Added at libpng-1.5.10 */
 #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
-   int num_palette_max;       /* maximum palette index found in IDAT */
-#endif
-
-   png_uint_16 num_trans;     /* number of transparency values */
-   png_byte compression;      /* file compression type (always 0) */
-   png_byte filter;           /* file filter type (always 0) */
-   png_byte interlaced;       /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
-   png_byte pass;             /* current interlace pass (0 - 6) */
-   png_byte do_filter;        /* row filter flags (see PNG_FILTER_ below ) */
-   png_byte color_type;       /* color type of file */
-   png_byte bit_depth;        /* bit depth of file */
-   png_byte usr_bit_depth;    /* bit depth of users row: write only */
-   png_byte pixel_depth;      /* number of bits per pixel */
-   png_byte channels;         /* number of channels in file */
+  int num_palette_max; /* maximum palette index found in IDAT */
+#endif
+
+  png_uint_16 num_trans;  /* number of transparency values */
+  png_byte compression;   /* file compression type (always 0) */
+  png_byte filter;        /* file filter type (always 0) */
+  png_byte interlaced;    /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
+  png_byte pass;          /* current interlace pass (0 - 6) */
+  png_byte do_filter;     /* row filter flags (see PNG_FILTER_ below ) */
+  png_byte color_type;    /* color type of file */
+  png_byte bit_depth;     /* bit depth of file */
+  png_byte usr_bit_depth; /* bit depth of users row: write only */
+  png_byte pixel_depth;   /* number of bits per pixel */
+  png_byte channels;      /* number of channels in file */
 #ifdef PNG_WRITE_SUPPORTED
-   png_byte usr_channels;     /* channels at start of write: write only */
-#endif
-   png_byte sig_bytes;        /* magic bytes read/written from start of file */
-   png_byte maximum_pixel_depth;
-                              /* pixel depth used for the row buffers */
-   png_byte transformed_pixel_depth;
-                              /* pixel depth after read/write transforms */
+  png_byte usr_channels; /* channels at start of write: write only */
+#endif
+  png_byte sig_bytes; /* magic bytes read/written from start of file */
+  png_byte maximum_pixel_depth;
+  /* pixel depth used for the row buffers */
+  png_byte transformed_pixel_depth;
+/* pixel depth after read/write transforms */
 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
-   png_uint_16 filler;           /* filler bytes for pixel expansion */
-#endif
-
-#if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) ||\
-   defined(PNG_READ_ALPHA_MODE_SUPPORTED)
-   png_byte background_gamma_type;
-   png_fixed_point background_gamma;
-   png_color_16 background;   /* background color in screen gamma space */
+  png_uint_16 filler; /* filler bytes for pixel expansion */
+#endif
+
+#if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \
+    defined(PNG_READ_ALPHA_MODE_SUPPORTED)
+  png_byte background_gamma_type;
+  png_fixed_point background_gamma;
+  png_color_16 background; /* background color in screen gamma space */
 #ifdef PNG_READ_GAMMA_SUPPORTED
-   png_color_16 background_1; /* background normalized to gamma 1.0 */
+  png_color_16 background_1; /* background normalized to gamma 1.0 */
 #endif
 #endif /* PNG_bKGD_SUPPORTED */
 
 #ifdef PNG_WRITE_FLUSH_SUPPORTED
-   png_flush_ptr output_flush_fn; /* Function for flushing output */
-   png_uint_32 flush_dist;    /* how many rows apart to flush, 0 - no flush */
-   png_uint_32 flush_rows;    /* number of rows written since last flush */
+  png_flush_ptr output_flush_fn; /* Function for flushing output */
+  png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */
+  png_uint_32 flush_rows; /* number of rows written since last flush */
 #endif
 
 #ifdef PNG_READ_GAMMA_SUPPORTED
-   int gamma_shift;      /* number of "insignificant" bits in 16-bit gamma */
-   png_fixed_point screen_gamma; /* screen gamma value (display_exponent) */
-
-   png_bytep gamma_table;     /* gamma table for 8-bit depth files */
-   png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
+  int gamma_shift; /* number of "insignificant" bits in 16-bit gamma */
+  png_fixed_point screen_gamma; /* screen gamma value (display_exponent) */
+
+  png_bytep gamma_table;        /* gamma table for 8-bit depth files */
+  png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
 #if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
-   defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \
-   defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
-   png_bytep gamma_from_1;    /* converts from 1.0 to screen */
-   png_bytep gamma_to_1;      /* converts from file to 1.0 */
-   png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */
-   png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */
+    defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \
+    defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
+  png_bytep gamma_from_1;        /* converts from 1.0 to screen */
+  png_bytep gamma_to_1;          /* converts from file to 1.0 */
+  png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */
+  png_uint_16pp gamma_16_to_1;   /* converts from file to 1.0 */
 #endif /* READ_BACKGROUND || READ_ALPHA_MODE || RGB_TO_GRAY */
 #endif
 
 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
-   png_color_8 sig_bit;       /* significant bits in each available channel */
+  png_color_8 sig_bit; /* significant bits in each available channel */
 #endif
 
 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
-   png_color_8 shift;         /* shift for significant bit tranformation */
-#endif
-
-#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
- || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
-   png_bytep trans_alpha;           /* alpha values for paletted files */
-   png_color_16 trans_color;  /* transparent color for non-paletted files */
-#endif
-
-   png_read_status_ptr read_row_fn;   /* called after each row is decoded */
-   png_write_status_ptr write_row_fn; /* called after each row is encoded */
+  png_color_8 shift; /* shift for significant bit tranformation */
+#endif
+
+#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \
+    defined(PNG_READ_EXPAND_SUPPORTED) ||                                    \
+    defined(PNG_READ_BACKGROUND_SUPPORTED)
+  png_bytep trans_alpha;    /* alpha values for paletted files */
+  png_color_16 trans_color; /* transparent color for non-paletted files */
+#endif
+
+  png_read_status_ptr read_row_fn;   /* called after each row is decoded */
+  png_write_status_ptr write_row_fn; /* called after each row is encoded */
 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
-   png_progressive_info_ptr info_fn; /* called after header data fully read */
-   png_progressive_row_ptr row_fn;   /* called after a prog. row is decoded */
-   png_progressive_end_ptr end_fn;   /* called after image is complete */
-   png_bytep save_buffer_ptr;        /* current location in save_buffer */
-   png_bytep save_buffer;            /* buffer for previously read data */
-   png_bytep current_buffer_ptr;     /* current location in current_buffer */
-   png_bytep current_buffer;         /* buffer for recently used data */
-   png_uint_32 push_length;          /* size of current input chunk */
-   png_uint_32 skip_length;          /* bytes to skip in input data */
-   png_size_t save_buffer_size;      /* amount of data now in save_buffer */
-   png_size_t save_buffer_max;       /* total size of save_buffer */
-   png_size_t buffer_size;           /* total amount of available input data */
-   png_size_t current_buffer_size;   /* amount of data now in current_buffer */
-   int process_mode;                 /* what push library is currently doing */
-   int cur_palette;                  /* current push library palette index */
+  png_progressive_info_ptr info_fn; /* called after header data fully read */
+  png_progressive_row_ptr row_fn;   /* called after a prog. row is decoded */
+  png_progressive_end_ptr end_fn;   /* called after image is complete */
+  png_bytep save_buffer_ptr;        /* current location in save_buffer */
+  png_bytep save_buffer;            /* buffer for previously read data */
+  png_bytep current_buffer_ptr;     /* current location in current_buffer */
+  png_bytep current_buffer;         /* buffer for recently used data */
+  png_uint_32 push_length;          /* size of current input chunk */
+  png_uint_32 skip_length;          /* bytes to skip in input data */
+  png_size_t save_buffer_size;      /* amount of data now in save_buffer */
+  png_size_t save_buffer_max;       /* total size of save_buffer */
+  png_size_t buffer_size;           /* total amount of available input data */
+  png_size_t current_buffer_size;   /* amount of data now in current_buffer */
+  int process_mode;                 /* what push library is currently doing */
+  int cur_palette;                  /* current push library palette index */
 
 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
 
 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
-/* For the Borland special 64K segment handler */
-   png_bytepp offset_table_ptr;
-   png_bytep offset_table;
-   png_uint_16 offset_table_number;
-   png_uint_16 offset_table_count;
-   png_uint_16 offset_table_count_free;
+  /* For the Borland special 64K segment handler */
+  png_bytepp offset_table_ptr;
+  png_bytep offset_table;
+  png_uint_16 offset_table_number;
+  png_uint_16 offset_table_count;
+  png_uint_16 offset_table_count_free;
 #endif
 
 #ifdef PNG_READ_QUANTIZE_SUPPORTED
-   png_bytep palette_lookup; /* lookup table for quantizing */
-   png_bytep quantize_index; /* index translation for palette files */
+  png_bytep palette_lookup; /* lookup table for quantizing */
+  png_bytep quantize_index; /* index translation for palette files */
 #endif
 
 #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
-   png_byte heuristic_method;        /* heuristic for row filter selection */
-   png_byte num_prev_filters;        /* number of weights for previous rows */
-   png_bytep prev_filters;           /* filter type(s) of previous row(s) */
-   png_uint_16p filter_weights;      /* weight(s) for previous line(s) */
-   png_uint_16p inv_filter_weights;  /* 1/weight(s) for previous line(s) */
-   png_uint_16p filter_costs;        /* relative filter calculation cost */
-   png_uint_16p inv_filter_costs;    /* 1/relative filter calculation cost */
-#endif
-
-   /* Options */
+  png_byte heuristic_method;       /* heuristic for row filter selection */
+  png_byte num_prev_filters;       /* number of weights for previous rows */
+  png_bytep prev_filters;          /* filter type(s) of previous row(s) */
+  png_uint_16p filter_weights;     /* weight(s) for previous line(s) */
+  png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */
+  png_uint_16p filter_costs;       /* relative filter calculation cost */
+  png_uint_16p inv_filter_costs;   /* 1/relative filter calculation cost */
+#endif
+
+/* Options */
 #ifdef PNG_SET_OPTION_SUPPORTED
-   png_byte options;           /* On/off state (up to 4 options) */
+  png_byte options; /* On/off state (up to 4 options) */
 #endif
 
 #if PNG_LIBPNG_VER < 10700
 /* To do: remove this from libpng-1.7 */
 #ifdef PNG_TIME_RFC1123_SUPPORTED
-   char time_buffer[29]; /* String to hold RFC 1123 time text */
-#endif
-#endif
-
-/* New members added in libpng-1.0.6 */
-
-   png_uint_32 free_me;    /* flags items libpng is responsible for freeing */
+  char time_buffer[29]; /* String to hold RFC 1123 time text */
+#endif
+#endif
+
+  /* New members added in libpng-1.0.6 */
+
+  png_uint_32 free_me; /* flags items libpng is responsible for freeing */
 
 #ifdef PNG_USER_CHUNKS_SUPPORTED
-   png_voidp user_chunk_ptr;
+  png_voidp user_chunk_ptr;
 #ifdef PNG_READ_USER_CHUNKS_SUPPORTED
-   png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
+  png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
 #endif
 #endif
 
 #ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
-   int          unknown_default; /* As PNG_HANDLE_* */
-   unsigned int num_chunk_list;  /* Number of entries in the list */
-   png_bytep    chunk_list;      /* List of png_byte[5]; the textual chunk name
-                                  * followed by a PNG_HANDLE_* byte */
+  int unknown_default;         /* As PNG_HANDLE_* */
+  unsigned int num_chunk_list; /* Number of entries in the list */
+  png_bytep chunk_list;        /* List of png_byte[5]; the textual chunk name
+                                * followed by a PNG_HANDLE_* byte */
 #endif
 
 /* New members added in libpng-1.0.3 */
 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
-   png_byte rgb_to_gray_status;
-   /* Added in libpng 1.5.5 to record setting of coefficients: */
-   png_byte rgb_to_gray_coefficients_set;
-   /* These were changed from png_byte in libpng-1.0.6 */
-   png_uint_16 rgb_to_gray_red_coeff;
-   png_uint_16 rgb_to_gray_green_coeff;
-   /* deleted in 1.5.5: rgb_to_gray_blue_coeff; */
+  png_byte rgb_to_gray_status;
+  /* Added in libpng 1.5.5 to record setting of coefficients: */
+  png_byte rgb_to_gray_coefficients_set;
+  /* These were changed from png_byte in libpng-1.0.6 */
+  png_uint_16 rgb_to_gray_red_coeff;
+  png_uint_16 rgb_to_gray_green_coeff;
+/* deleted in 1.5.5: rgb_to_gray_blue_coeff; */
 #endif
 
 /* New member added in libpng-1.0.4 (renamed in 1.0.9) */
 #if defined(PNG_MNG_FEATURES_SUPPORTED)
-/* Changed from png_byte to png_uint_32 at version 1.2.0 */
-   png_uint_32 mng_features_permitted;
+  /* Changed from png_byte to png_uint_32 at version 1.2.0 */
+  png_uint_32 mng_features_permitted;
 #endif
 
 /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
 #ifdef PNG_MNG_FEATURES_SUPPORTED
-   png_byte filter_type;
+  png_byte filter_type;
 #endif
 
 /* New members added in libpng-1.2.0 */
 
 /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
 #ifdef PNG_USER_MEM_SUPPORTED
-   png_voidp mem_ptr;             /* user supplied struct for mem functions */
-   png_malloc_ptr malloc_fn;      /* function for allocating memory */
-   png_free_ptr free_fn;          /* function for freeing memory */
-#endif
-
-/* New member added in libpng-1.0.13 and 1.2.0 */
-   png_bytep big_row_buf;         /* buffer to save current (unfiltered) row */
+  png_voidp mem_ptr;        /* user supplied struct for mem functions */
+  png_malloc_ptr malloc_fn; /* function for allocating memory */
+  png_free_ptr free_fn;     /* function for freeing memory */
+#endif
+
+  /* New member added in libpng-1.0.13 and 1.2.0 */
+  png_bytep big_row_buf; /* buffer to save current (unfiltered) row */
 
 #ifdef PNG_READ_QUANTIZE_SUPPORTED
-/* The following three members were added at version 1.0.14 and 1.2.4 */
-   png_bytep quantize_sort;          /* working sort array */
-   png_bytep index_to_palette;       /* where the original index currently is
-                                        in the palette */
-   png_bytep palette_to_index;       /* which original index points to this
-                                         palette color */
-#endif
-
-/* New members added in libpng-1.0.16 and 1.2.6 */
-   png_byte compression_type;
+  /* The following three members were added at version 1.0.14 and 1.2.4 */
+  png_bytep quantize_sort;    /* working sort array */
+  png_bytep index_to_palette; /* where the original index currently is
+                                 in the palette */
+  png_bytep palette_to_index; /* which original index points to this
+                                  palette color */
+#endif
+
+  /* New members added in libpng-1.0.16 and 1.2.6 */
+  png_byte compression_type;
 
 #ifdef PNG_USER_LIMITS_SUPPORTED
-   png_uint_32 user_width_max;
-   png_uint_32 user_height_max;
-
-   /* Added in libpng-1.4.0: Total number of sPLT, text, and unknown
-    * chunks that can be stored (0 means unlimited).
-    */
-   png_uint_32 user_chunk_cache_max;
-
-   /* Total memory that a zTXt, sPLT, iTXt, iCCP, or unknown chunk
-    * can occupy when decompressed.  0 means unlimited.
-    */
-   png_alloc_size_t user_chunk_malloc_max;
+  png_uint_32 user_width_max;
+  png_uint_32 user_height_max;
+
+  /* Added in libpng-1.4.0: Total number of sPLT, text, and unknown
+   * chunks that can be stored (0 means unlimited).
+   */
+  png_uint_32 user_chunk_cache_max;
+
+  /* Total memory that a zTXt, sPLT, iTXt, iCCP, or unknown chunk
+   * can occupy when decompressed.  0 means unlimited.
+   */
+  png_alloc_size_t user_chunk_malloc_max;
 #endif
 
 /* New member added in libpng-1.0.25 and 1.2.17 */
 #ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
-   /* Temporary storage for unknown chunk that the library doesn't recognize,
-    * used while reading the chunk.
-    */
-   png_unknown_chunk unknown_chunk;
-#endif
-
-/* New member added in libpng-1.2.26 */
+  /* Temporary storage for unknown chunk that the library doesn't recognize,
+   * used while reading the chunk.
+   */
+  png_unknown_chunk unknown_chunk;
+#endif
+
+  /* New member added in libpng-1.2.26 */
   png_size_t old_big_row_buf_size;
 
 #ifdef PNG_READ_SUPPORTED
-/* New member added in libpng-1.2.30 */
-  png_bytep        read_buffer;      /* buffer for reading chunk data */
+  /* New member added in libpng-1.2.30 */
+  png_bytep read_buffer;             /* buffer for reading chunk data */
   png_alloc_size_t read_buffer_size; /* current size of the buffer */
 #endif
 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
-  uInt             IDAT_read_size;   /* limit on read buffer size for IDAT */
+  uInt IDAT_read_size; /* limit on read buffer size for IDAT */
 #endif
 
 #ifdef PNG_IO_STATE_SUPPORTED
-/* New member added in libpng-1.4.0 */
-   png_uint_32 io_state;
-#endif
-
-/* New member added in libpng-1.5.6 */
-   png_bytep big_prev_row;
-
-/* New member added in libpng-1.5.7 */
-   void (*read_filter[PNG_FILTER_VALUE_LAST-1])(png_row_infop row_info,
-      png_bytep row, png_const_bytep prev_row);
+  /* New member added in libpng-1.4.0 */
+  png_uint_32 io_state;
+#endif
+
+  /* New member added in libpng-1.5.6 */
+  png_bytep big_prev_row;
+
+  /* New member added in libpng-1.5.7 */
+  void (*read_filter[PNG_FILTER_VALUE_LAST - 1])(png_row_infop row_info,
+                                                 png_bytep row,
+                                                 png_const_bytep prev_row);
 
 #ifdef PNG_READ_SUPPORTED
 #if defined(PNG_COLORSPACE_SUPPORTED) || defined(PNG_GAMMA_SUPPORTED)
-   png_colorspace   colorspace;
+  png_colorspace colorspace;
 #endif
 #endif
 };
 #endif /* PNGSTRUCT_H */