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[devel] Removed PNG_DEPSTRUCT markup in pngstruct.h and pnginfo.h

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and undid the linewrapping that it required.
Revised comments in pngstruct.h and pnginfo.h and added pointers to
the libpng license.
This commit is contained in:
Glenn Randers-Pehrson 2010-02-09 00:36:08 -06:00
parent db5f4307ca
commit 3f506b788e
4 changed files with 267 additions and 339 deletions
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4
ANNOUNCE
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@ -42,6 +42,10 @@ version 1.5.0beta04 [February 9, 2010]
Removed malformed "incomplete struct declaration" of png_info from png.h
version 1.5.0beta05 [February 9, 2010]
Removed PNG_DEPSTRUCT markup in pngstruct.h and pnginfo.h, and undid the
linewrapping that it required.
Revised comments in pngstruct.h and pnginfo.h and added pointers to
the libpng license.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit

11
CHANGES
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@ -2502,22 +2502,27 @@ version 1.4.1beta07 [February 6, 2010]
version 1.4.1beta08 [February 6, 2010]
Minor cleanup and updating of dates and copyright year.
version 1.5.0beta01 [February 7, 2010]
Moved declaration of png_struct into private pngstruct.h and png_info
into pnginfo.h
version 1.5.0beta02 [February 7, 2010]
version 1.4.1beta09 and 1.5.0beta02 [February 7, 2010]
Reverted to original png_push_save_buffer() code.
version 1.5.0beta03 [February 8, 2010]
version 1.4.1beta10 and 1.5.0beta03 [February 8, 2010]
Return allocated "old_buffer" in png_push_save_buffer() before
calling png_error().
calling png_error(), to avoid a potential memory leak.
Updated configure script to use SO number 15.
version 1.5.0beta04 [February 9, 2010]
Removed malformed "incomplete struct declaration" of png_info from png.h
version 1.5.0beta05 [February 9, 2010]
Removed PNG_DEPSTRUCT markup in pngstruct.h and pnginfo.h, and undid the
linewrapping that it required.
Revised comments in pngstruct.h and pnginfo.h and added pointers to
the libpng license.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit

197
pnginfo.h
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@ -1,8 +1,24 @@
/* png_info is a structure that holds the information in a PNG file so
/* pnginfo.h - header file for PNG reference library
*
* Copyright (c) 1998-2010 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 version 1.5.0 - February 9, 2010
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*/
/* png_info is a structure that holds the information in a PNG file so
* that the application can find out the characteristics of the image.
* If you are reading the file, this structure will tell you what is
* in the PNG file. If you are writing the file, fill in the information
* you want to put into the PNG file, then call png_write_info().
* you want to put into the PNG file, using png_set_*() functions, then
* call png_write_info().
*
* The names chosen should be very close to the PNG specification, so
* consult that document for information about the meaning of each field.
*
@ -13,11 +29,8 @@
* png_info_struct from the application, so this makes it easier to use
* libpng with dynamic libraries, and even makes it possible to use
* libraries that don't have all of the libpng ancillary chunk-handing
* functionality.
*
* In any case, the order of the parameters in png_info_struct should NOT
* be changed for as long as possible to keep compatibility with applications
* that use the old direct-access method with png_info_struct.
* functionality. In libpng-1.5.0 this was moved into a separate private
* file that is not visible to applications.
*
* The following members may have allocated storage attached that should be
* cleaned up before the structure is discarded: palette, trans, text,
@ -40,38 +53,25 @@
struct png_info_def
{
/* the following are necessary for every PNG file */
png_uint_32 width PNG_DEPSTRUCT; /* width of image in pixels (from IHDR) */
png_uint_32 height PNG_DEPSTRUCT; /* height of image in pixels (from IHDR) */
png_uint_32 valid PNG_DEPSTRUCT; /* valid chunk data (see PNG_INFO_
below) */
png_size_t rowbytes PNG_DEPSTRUCT; /* bytes needed to hold an untransformed
row */
png_colorp palette PNG_DEPSTRUCT; /* array of color values
(valid & PNG_INFO_PLTE) */
png_uint_16 num_palette PNG_DEPSTRUCT; /* number of color entries in
"palette" (PLTE) */
png_uint_16 num_trans PNG_DEPSTRUCT; /* number of transparent palette
color (tRNS) */
png_byte bit_depth PNG_DEPSTRUCT; /* 1, 2, 4, 8, or 16 bits/channel
(from IHDR) */
png_byte color_type PNG_DEPSTRUCT; /* see PNG_COLOR_TYPE_ below
(from IHDR) */
png_uint_32 width; /* width of image in pixels (from IHDR) */
png_uint_32 height; /* height of image in pixels (from IHDR) */
png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */
png_size_t rowbytes; /* bytes needed to hold an untransformed row */
png_colorp palette; /* array of color values (valid & PNG_INFO_PLTE) */
png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */
png_uint_16 num_trans; /* number of transparent palette color (tRNS) */
png_byte bit_depth; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */
png_byte color_type; /* see PNG_COLOR_TYPE_ below (from IHDR) */
/* The following three should have been named *_method not *_type */
png_byte compression_type PNG_DEPSTRUCT; /* must be
PNG_COMPRESSION_TYPE_BASE (IHDR) */
png_byte filter_type PNG_DEPSTRUCT; /* must be PNG_FILTER_TYPE_BASE
(from IHDR) */
png_byte interlace_type PNG_DEPSTRUCT; /* One of PNG_INTERLACE_NONE,
PNG_INTERLACE_ADAM7 */
png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */
png_byte filter_type; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */
png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
/* The following is informational only on read, and not used on writes. */
png_byte channels PNG_DEPSTRUCT; /* number of data channels per
pixel (1, 2, 3, 4) */
png_byte pixel_depth PNG_DEPSTRUCT; /* number of bits per pixel */
png_byte spare_byte PNG_DEPSTRUCT; /* to align the data, and for
future use */
png_byte signature[8] PNG_DEPSTRUCT; /* magic bytes read by libpng
from start of file */
png_byte channels; /* number of data channels per pixel (1, 2, 3, 4) */
png_byte pixel_depth; /* number of bits per pixel */
png_byte spare_byte; /* to align the data, and for future use */
png_byte signature[8]; /* magic bytes read by libpng from start of file */
/* The rest of the data is optional. If you are reading, check the
* valid field to see if the information in these are valid. If you
@ -84,15 +84,13 @@ struct png_info_def
* on which the image was created, normally in the range [1.0, 2.5].
* Data is valid if (valid & PNG_INFO_gAMA) is non-zero.
*/
float gamma PNG_DEPSTRUCT; /* gamma value of image,
if (valid & PNG_INFO_gAMA) */
float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */
#endif
#ifdef PNG_sRGB_SUPPORTED
/* GR-P, 0.96a */
/* Data valid if (valid & PNG_INFO_sRGB) non-zero. */
png_byte srgb_intent PNG_DEPSTRUCT; /* sRGB rendering intent
[0, 1, 2, or 3] */
png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */
#endif
#ifdef PNG_TEXT_SUPPORTED
@ -104,16 +102,16 @@ struct png_info_def
* unique, and the text string may be empty. Any number of text chunks may
* be in an image.
*/
int num_text PNG_DEPSTRUCT; /* number of comments read/to write */
int max_text PNG_DEPSTRUCT; /* current size of text array */
png_textp text PNG_DEPSTRUCT; /* array of comments read/to write */
int num_text; /* number of comments read or comments to write */
int max_text; /* current size of text array */
png_textp text; /* array of comments read or comments to write */
#endif /* PNG_TEXT_SUPPORTED */
#ifdef PNG_tIME_SUPPORTED
/* The tIME chunk holds the last time the displayed image data was
* modified. See the png_time struct for the contents of this struct.
*/
png_time mod_time PNG_DEPSTRUCT;
png_time mod_time;
#endif
#ifdef PNG_sBIT_SUPPORTED
@ -123,7 +121,7 @@ struct png_info_def
* the low-order bits is not specified. Data is valid if
* (valid & PNG_INFO_sBIT) is non-zero.
*/
png_color_8 sig_bit PNG_DEPSTRUCT; /* significant bits in color channels */
png_color_8 sig_bit; /* significant bits in color channels */
#endif
#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \
@ -137,10 +135,9 @@ defined(PNG_READ_BACKGROUND_SUPPORTED)
* single color specified that should be treated as fully transparent.
* Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
*/
png_bytep trans_alpha PNG_DEPSTRUCT; /* alpha values for paletted
image */
png_color_16 trans_color PNG_DEPSTRUCT; /* transparent color for
non-palette image */
png_bytep trans; /* alpha values for paletted image */
png_bytep trans_alpha; /* alpha values for paletted image */
png_color_16 trans_color; /* transparent color for non-palette image */
#endif
#if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
@ -150,7 +147,7 @@ defined(PNG_READ_BACKGROUND_SUPPORTED)
* in "background" are normally in the same color space/depth as the
* pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero.
*/
png_color_16 background PNG_DEPSTRUCT;
png_color_16 background;
#endif
#ifdef PNG_oFFs_SUPPORTED
@ -159,9 +156,9 @@ defined(PNG_READ_BACKGROUND_SUPPORTED)
* application-specific co-ordinate space. See the PNG_OFFSET_ defines
* below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero.
*/
png_int_32 x_offset PNG_DEPSTRUCT; /* x offset on page */
png_int_32 y_offset PNG_DEPSTRUCT; /* y offset on page */
png_byte offset_unit_type PNG_DEPSTRUCT; /* offset units type */
png_int_32 x_offset; /* x offset on page */
png_int_32 y_offset; /* y offset on page */
png_byte offset_unit_type; /* offset units type */
#endif
#ifdef PNG_pHYs_SUPPORTED
@ -169,10 +166,9 @@ defined(PNG_READ_BACKGROUND_SUPPORTED)
* display or printing in "phys_unit_type" units (see PNG_RESOLUTION_
* defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero.
*/
png_uint_32 x_pixels_per_unit PNG_DEPSTRUCT; /* horizontal pixel density */
png_uint_32 y_pixels_per_unit PNG_DEPSTRUCT; /* vertical pixel density */
png_byte phys_unit_type PNG_DEPSTRUCT; /* resolution type (see
PNG_RESOLUTION_ below) */
png_uint_32 x_pixels_per_unit; /* horizontal pixel density */
png_uint_32 y_pixels_per_unit; /* vertical pixel density */
png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */
#endif
#ifdef PNG_hIST_SUPPORTED
@ -182,7 +178,7 @@ defined(PNG_READ_BACKGROUND_SUPPORTED)
* values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST)
* is non-zero.
*/
png_uint_16p hist PNG_DEPSTRUCT;
png_uint_16p hist;
#endif
#ifdef PNG_cHRM_SUPPORTED
@ -193,14 +189,14 @@ defined(PNG_READ_BACKGROUND_SUPPORTED)
* [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero.
*/
#ifdef PNG_FLOATING_POINT_SUPPORTED
float x_white PNG_DEPSTRUCT;
float y_white PNG_DEPSTRUCT;
float x_red PNG_DEPSTRUCT;
float y_red PNG_DEPSTRUCT;
float x_green PNG_DEPSTRUCT;
float y_green PNG_DEPSTRUCT;
float x_blue PNG_DEPSTRUCT;
float y_blue PNG_DEPSTRUCT;
float x_white;
float y_white;
float x_red;
float y_red;
float x_green;
float y_green;
float x_blue;
float y_blue;
#endif
#endif
@ -216,44 +212,38 @@ defined(PNG_READ_BACKGROUND_SUPPORTED)
* implemented, and for a description of the ASCII parameter strings.
* Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
*/
png_charp pcal_purpose PNG_DEPSTRUCT; /* pCAL chunk description string */
png_int_32 pcal_X0 PNG_DEPSTRUCT; /* minimum value */
png_int_32 pcal_X1 PNG_DEPSTRUCT; /* maximum value */
png_charp pcal_units PNG_DEPSTRUCT; /* Latin-1 string giving physical
units */
png_charpp pcal_params PNG_DEPSTRUCT; /* ASCII strings containing
parameter values */
png_byte pcal_type PNG_DEPSTRUCT; /* equation type
(see PNG_EQUATION_ below) */
png_byte pcal_nparams PNG_DEPSTRUCT; /* number of parameters given
in pcal_params */
png_charp pcal_purpose; /* pCAL chunk description string */
png_int_32 pcal_X0; /* minimum value */
png_int_32 pcal_X1; /* maximum value */
png_charp pcal_units; /* Latin-1 string giving physical units */
png_charpp pcal_params; /* ASCII strings containing parameter values */
png_byte pcal_type; /* equation type (see PNG_EQUATION_ below) */
png_byte pcal_nparams; /* number of parameters given in pcal_params */
#endif
/* New members added in libpng-1.0.6 */
png_uint_32 free_me PNG_DEPSTRUCT; /* flags items libpng is
responsible for freeing */
png_uint_32 free_me; /* flags items libpng is responsible for freeing */
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \
defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
/* Storage for unknown chunks that the library doesn't recognize. */
png_unknown_chunkp unknown_chunks PNG_DEPSTRUCT;
png_size_t unknown_chunks_num PNG_DEPSTRUCT;
png_unknown_chunkp unknown_chunks;
png_size_t unknown_chunks_num;
#endif
#ifdef PNG_iCCP_SUPPORTED
/* iCCP chunk data. */
png_charp iccp_name PNG_DEPSTRUCT; /* profile name */
png_charp iccp_profile PNG_DEPSTRUCT; /* International Color Consortium
profile data */
png_charp iccp_name; /* profile name */
png_charp iccp_profile; /* International Color Consortium profile data */
/* Note to maintainer: should be png_bytep */
png_uint_32 iccp_proflen PNG_DEPSTRUCT; /* ICC profile data length */
png_byte iccp_compression PNG_DEPSTRUCT; /* Always zero */
png_uint_32 iccp_proflen; /* ICC profile data length */
png_byte iccp_compression; /* Always zero */
#endif
#ifdef PNG_sPLT_SUPPORTED
/* Data on sPLT chunks (there may be more than one). */
png_sPLT_tp splt_palettes PNG_DEPSTRUCT;
png_uint_32 splt_palettes_num PNG_DEPSTRUCT;
png_sPLT_tp splt_palettes;
png_uint_32 splt_palettes_num;
#endif
#ifdef PNG_sCAL_SUPPORTED
@ -264,14 +254,14 @@ defined(PNG_READ_BACKGROUND_SUPPORTED)
* in the image. This external representation is converted to double
* here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero.
*/
png_byte scal_unit PNG_DEPSTRUCT; /* unit of physical scale */
png_byte scal_unit; /* unit of physical scale */
#ifdef PNG_FLOATING_POINT_SUPPORTED
double scal_pixel_width PNG_DEPSTRUCT; /* width of one pixel */
double scal_pixel_height PNG_DEPSTRUCT; /* height of one pixel */
double scal_pixel_width; /* width of one pixel */
double scal_pixel_height; /* height of one pixel */
#endif
#ifdef PNG_FIXED_POINT_SUPPORTED
png_charp scal_s_width PNG_DEPSTRUCT; /* string containing height */
png_charp scal_s_height PNG_DEPSTRUCT; /* string containing width */
png_charp scal_s_width; /* string containing height */
png_charp scal_s_height; /* string containing width */
#endif
#endif
@ -279,23 +269,22 @@ defined(PNG_READ_BACKGROUND_SUPPORTED)
/* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS)
non-zero */
/* Data valid if (valid & PNG_INFO_IDAT) non-zero */
png_bytepp row_pointers PNG_DEPSTRUCT; /* the image bits */
png_bytepp row_pointers; /* the image bits */
#endif
#if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED)
png_fixed_point int_gamma PNG_DEPSTRUCT; /* gamma of image,
if (valid & PNG_INFO_gAMA) */
png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */
#endif
#if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED)
png_fixed_point int_x_white PNG_DEPSTRUCT;
png_fixed_point int_y_white PNG_DEPSTRUCT;
png_fixed_point int_x_red PNG_DEPSTRUCT;
png_fixed_point int_y_red PNG_DEPSTRUCT;
png_fixed_point int_x_green PNG_DEPSTRUCT;
png_fixed_point int_y_green PNG_DEPSTRUCT;
png_fixed_point int_x_blue PNG_DEPSTRUCT;
png_fixed_point int_y_blue PNG_DEPSTRUCT;
png_fixed_point int_x_white;
png_fixed_point int_y_white;
png_fixed_point int_x_red;
png_fixed_point int_y_red;
png_fixed_point int_x_green;
png_fixed_point int_y_green;
png_fixed_point int_x_blue;
png_fixed_point int_y_blue;
#endif
};

390
pngstruct.h
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@ -1,300 +1,234 @@
/* pngstruct.h - header file for PNG reference library
*
* Copyright (c) 1998-2010 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 version 1.5.0 - February 9, 2010
*
* 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, except to store
* the jmp_buf.
* It should NOT be accessed directly by an application.
*/
struct png_struct_def
{
#ifdef PNG_SETJMP_SUPPORTED
jmp_buf jmpbuf PNG_DEPSTRUCT; /* used in png_error */
png_longjmp_ptr longjmp_fn PNG_DEPSTRUCT;/* setjmp non-local goto
function. */
jmp_buf jmpbuf; /* used in png_error */
png_longjmp_ptr longjmp_fn;/* setjmp non-local goto function. */
#endif
png_error_ptr error_fn PNG_DEPSTRUCT; /* function for printing
errors and aborting */
png_error_ptr warning_fn PNG_DEPSTRUCT; /* function for printing
warnings */
png_voidp error_ptr PNG_DEPSTRUCT; /* user supplied struct for
error functions */
png_rw_ptr write_data_fn PNG_DEPSTRUCT; /* function for writing
output data */
png_rw_ptr read_data_fn PNG_DEPSTRUCT; /* function for reading
input data */
png_voidp io_ptr PNG_DEPSTRUCT; /* ptr to application struct
for I/O functions */
png_error_ptr error_fn; /* function for printing errors and aborting */
png_error_ptr warning_fn; /* function for printing warnings */
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 PNG_DEPSTRUCT; /* 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 PNG_DEPSTRUCT; /* 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 PNG_DEPSTRUCT; /* user supplied struct
for user transform */
png_byte user_transform_depth PNG_DEPSTRUCT; /* bit depth of user
transformed pixels */
png_byte user_transform_channels PNG_DEPSTRUCT; /* channels in user
transformed pixels */
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 PNG_DEPSTRUCT; /* tells us where we are in
the PNG file */
png_uint_32 flags PNG_DEPSTRUCT; /* flags indicating various
things to libpng */
png_uint_32 transformations PNG_DEPSTRUCT; /* which transformations
to perform */
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 */
z_stream zstream PNG_DEPSTRUCT; /* pointer to decompression
structure (below) */
png_bytep zbuf PNG_DEPSTRUCT; /* buffer for zlib */
png_size_t zbuf_size PNG_DEPSTRUCT; /* size of zbuf */
int zlib_level PNG_DEPSTRUCT; /* holds zlib compression level */
int zlib_method PNG_DEPSTRUCT; /* holds zlib compression method */
int zlib_window_bits PNG_DEPSTRUCT; /* holds zlib compression window
bits */
int zlib_mem_level PNG_DEPSTRUCT; /* holds zlib compression memory
level */
int zlib_strategy PNG_DEPSTRUCT; /* holds zlib compression
strategy */
z_stream zstream; /* pointer to decompression structure (below) */
png_bytep zbuf; /* buffer for zlib */
png_size_t zbuf_size; /* size of zbuf */
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_uint_32 width PNG_DEPSTRUCT; /* width of image in pixels */
png_uint_32 height PNG_DEPSTRUCT; /* height of image in pixels */
png_uint_32 num_rows PNG_DEPSTRUCT; /* number of rows in current pass */
png_uint_32 usr_width PNG_DEPSTRUCT; /* width of row at start of write */
png_size_t rowbytes PNG_DEPSTRUCT; /* size of row in bytes */
png_uint_32 iwidth PNG_DEPSTRUCT; /* width of current interlaced
row in pixels */
png_uint_32 row_number PNG_DEPSTRUCT; /* current row in interlace pass */
png_bytep prev_row PNG_DEPSTRUCT; /* buffer to save previous
(unfiltered) row */
png_bytep row_buf PNG_DEPSTRUCT; /* buffer to save current
(unfiltered) row */
png_bytep sub_row PNG_DEPSTRUCT; /* buffer to save "sub" row
when filtering */
png_bytep up_row PNG_DEPSTRUCT; /* buffer to save "up" row
when filtering */
png_bytep avg_row PNG_DEPSTRUCT; /* buffer to save "avg" row
when filtering */
png_bytep paeth_row PNG_DEPSTRUCT; /* buffer to save "Paeth" row
when filtering */
png_row_info row_info PNG_DEPSTRUCT; /* used for transformation
routines */
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_bytep prev_row; /* buffer to save previous (unfiltered) row */
png_bytep row_buf; /* buffer to save current (unfiltered) row */
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 */
png_row_info row_info; /* used for transformation routines */
png_uint_32 idat_size PNG_DEPSTRUCT; /* current IDAT size for read */
png_uint_32 crc PNG_DEPSTRUCT; /* current chunk CRC value */
png_colorp palette PNG_DEPSTRUCT; /* palette from the input file */
png_uint_16 num_palette PNG_DEPSTRUCT; /* number of color entries in
palette */
png_uint_16 num_trans PNG_DEPSTRUCT; /* number of transparency values */
png_byte chunk_name[5] PNG_DEPSTRUCT; /* null-terminated name of current
chunk */
png_byte compression PNG_DEPSTRUCT; /* file compression type
(always 0) */
png_byte filter PNG_DEPSTRUCT; /* file filter type (always 0) */
png_byte interlaced PNG_DEPSTRUCT; /* PNG_INTERLACE_NONE,
PNG_INTERLACE_ADAM7 */
png_byte pass PNG_DEPSTRUCT; /* current interlace pass (0 - 6) */
png_byte do_filter PNG_DEPSTRUCT; /* row filter flags (see
PNG_FILTER_ below ) */
png_byte color_type PNG_DEPSTRUCT; /* color type of file */
png_byte bit_depth PNG_DEPSTRUCT; /* bit depth of file */
png_byte usr_bit_depth PNG_DEPSTRUCT; /* bit depth of users row */
png_byte pixel_depth PNG_DEPSTRUCT; /* number of bits per pixel */
png_byte channels PNG_DEPSTRUCT; /* number of channels in file */
png_byte usr_channels PNG_DEPSTRUCT; /* channels at start of write */
png_byte sig_bytes PNG_DEPSTRUCT; /* magic bytes read/written from
start of file */
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_uint_16 num_trans; /* number of transparency values */
png_byte chunk_name[5]; /* null-terminated name of current chunk */
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 */
png_byte pixel_depth; /* number of bits per pixel */
png_byte channels; /* number of channels in file */
png_byte usr_channels; /* channels at start of write */
png_byte sig_bytes; /* magic bytes read/written from start of file */
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
png_uint_16 filler PNG_DEPSTRUCT; /* filler bytes for pixel
expansion */
png_uint_16 filler; /* filler bytes for pixel expansion */
#endif
#ifdef PNG_bKGD_SUPPORTED
png_byte background_gamma_type PNG_DEPSTRUCT;
png_byte background_gamma_type;
# ifdef PNG_FLOATING_POINT_SUPPORTED
float background_gamma PNG_DEPSTRUCT;
float background_gamma;
# endif
png_color_16 background PNG_DEPSTRUCT; /* background color in
screen gamma space */
png_color_16 background; /* background color in screen gamma space */
#ifdef PNG_READ_GAMMA_SUPPORTED
png_color_16 background_1 PNG_DEPSTRUCT; /* 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 PNG_DEPSTRUCT; /* Function for flushing
output */
png_uint_32 flush_dist PNG_DEPSTRUCT; /* how many rows apart to flush,
0 - no flush */
png_uint_32 flush_rows PNG_DEPSTRUCT; /* 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
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
int gamma_shift PNG_DEPSTRUCT; /* number of "insignificant" bits
16-bit gamma */
int gamma_shift; /* number of "insignificant" bits in 16-bit gamma */
#ifdef PNG_FLOATING_POINT_SUPPORTED
float gamma PNG_DEPSTRUCT; /* file gamma value */
float screen_gamma PNG_DEPSTRUCT; /* screen gamma value
(display_exponent) */
float gamma; /* file gamma value */
float screen_gamma; /* screen gamma value (display_exponent) */
#endif
#endif
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
png_bytep gamma_table PNG_DEPSTRUCT; /* gamma table for 8-bit
depth files */
png_bytep gamma_from_1 PNG_DEPSTRUCT; /* converts from 1.0 to screen */
png_bytep gamma_to_1 PNG_DEPSTRUCT; /* converts from file to 1.0 */
png_uint_16pp gamma_16_table PNG_DEPSTRUCT; /* gamma table for 16-bit
depth files */
png_uint_16pp gamma_16_from_1 PNG_DEPSTRUCT; /* converts from 1.0 to
screen */
png_uint_16pp gamma_16_to_1 PNG_DEPSTRUCT; /* converts from file to 1.0 */
png_bytep gamma_table; /* gamma table for 8-bit depth files */
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_table; /* gamma table for 16-bit depth files */
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
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
png_color_8 sig_bit PNG_DEPSTRUCT; /* 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 PNG_DEPSTRUCT; /* shift for significant bit
tranformation */
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 PNG_DEPSTRUCT; /* alpha values for
paletted files */
png_color_16 trans_color PNG_DEPSTRUCT; /* transparent color for
non-paletted files */
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 PNG_DEPSTRUCT; /* called after each
row is decoded */
png_write_status_ptr write_row_fn PNG_DEPSTRUCT; /* called after each
row is encoded */
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 PNG_DEPSTRUCT; /* called after header
data fully read */
png_progressive_row_ptr row_fn PNG_DEPSTRUCT; /* called after each
prog. row is decoded */
png_progressive_end_ptr end_fn PNG_DEPSTRUCT; /* called after image
is complete */
png_bytep save_buffer_ptr PNG_DEPSTRUCT; /* current location in
save_buffer */
png_bytep save_buffer PNG_DEPSTRUCT; /* buffer for previously
read data */
png_bytep current_buffer_ptr PNG_DEPSTRUCT; /* current location in
current_buffer */
png_bytep current_buffer PNG_DEPSTRUCT; /* buffer for recently
used data */
png_uint_32 push_length PNG_DEPSTRUCT; /* size of current input
chunk */
png_uint_32 skip_length PNG_DEPSTRUCT; /* bytes to skip in
input data */
png_size_t save_buffer_size PNG_DEPSTRUCT; /* amount of data now
in save_buffer */
png_size_t save_buffer_max PNG_DEPSTRUCT; /* total size of
save_buffer */
png_size_t buffer_size PNG_DEPSTRUCT; /* total amount of
available input data */
png_size_t current_buffer_size PNG_DEPSTRUCT; /* amount of data now
in current_buffer */
int process_mode PNG_DEPSTRUCT; /* what push library
is currently doing */
int cur_palette PNG_DEPSTRUCT; /* 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 each 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 */
# ifdef PNG_TEXT_SUPPORTED
png_size_t current_text_size PNG_DEPSTRUCT; /* current size of
text input data */
png_size_t current_text_left PNG_DEPSTRUCT; /* how much text left
to read in input */
png_charp current_text PNG_DEPSTRUCT; /* current text chunk
buffer */
png_charp current_text_ptr PNG_DEPSTRUCT; /* current location
in current_text */
png_size_t current_text_size; /* current size of text input data */
png_size_t current_text_left; /* how much text left to read in input */
png_charp current_text; /* current text chunk buffer */
png_charp current_text_ptr; /* current location in current_text */
# endif /* PNG_PROGRESSIVE_READ_SUPPORTED && PNG_TEXT_SUPPORTED */
#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_DEPSTRUCT;
png_bytep offset_table PNG_DEPSTRUCT;
png_uint_16 offset_table_number PNG_DEPSTRUCT;
png_uint_16 offset_table_count PNG_DEPSTRUCT;
png_uint_16 offset_table_count_free PNG_DEPSTRUCT;
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_DITHER_SUPPORTED
png_bytep palette_lookup PNG_DEPSTRUCT; /* lookup table for dithering */
png_bytep dither_index PNG_DEPSTRUCT; /* index translation for palette
files */
png_bytep palette_lookup; /* lookup table for dithering */
png_bytep dither_index; /* index translation for palette files */
#endif
#if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED)
png_uint_16p hist PNG_DEPSTRUCT; /* histogram */
png_uint_16p hist; /* histogram */
#endif
#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
png_byte heuristic_method PNG_DEPSTRUCT; /* heuristic for row
filter selection */
png_byte num_prev_filters PNG_DEPSTRUCT; /* number of weights
for previous rows */
png_bytep prev_filters PNG_DEPSTRUCT; /* filter type(s) of
previous row(s) */
png_uint_16p filter_weights PNG_DEPSTRUCT; /* weight(s) for previous
line(s) */
png_uint_16p inv_filter_weights PNG_DEPSTRUCT; /* 1/weight(s) for
previous line(s) */
png_uint_16p filter_costs PNG_DEPSTRUCT; /* relative filter
calculation cost */
png_uint_16p inv_filter_costs PNG_DEPSTRUCT; /* 1/relative filter
calculation cost */
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
#ifdef PNG_TIME_RFC1123_SUPPORTED
png_charp time_buffer PNG_DEPSTRUCT; /* String to hold RFC 1123 time text */
png_charp time_buffer; /* String to hold RFC 1123 time text */
#endif
/* New members added in libpng-1.0.6 */
png_uint_32 free_me PNG_DEPSTRUCT; /* flags items libpng is
responsible for freeing */
png_uint_32 free_me; /* flags items libpng is responsible for freeing */
#ifdef PNG_USER_CHUNKS_SUPPORTED
png_voidp user_chunk_ptr PNG_DEPSTRUCT;
png_user_chunk_ptr read_user_chunk_fn PNG_DEPSTRUCT; /* user read
chunk handler */
png_voidp user_chunk_ptr;
png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
#endif
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
int num_chunk_list PNG_DEPSTRUCT;
png_bytep chunk_list PNG_DEPSTRUCT;
int num_chunk_list;
png_bytep chunk_list;
#endif
/* New members added in libpng-1.0.3 */
#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
png_byte rgb_to_gray_status PNG_DEPSTRUCT;
png_byte rgb_to_gray_status;
/* These were changed from png_byte in libpng-1.0.6 */
png_uint_16 rgb_to_gray_red_coeff PNG_DEPSTRUCT;
png_uint_16 rgb_to_gray_green_coeff PNG_DEPSTRUCT;
png_uint_16 rgb_to_gray_blue_coeff PNG_DEPSTRUCT;
png_uint_16 rgb_to_gray_red_coeff;
png_uint_16 rgb_to_gray_green_coeff;
png_uint_16 rgb_to_gray_blue_coeff;
#endif
/* New member added in libpng-1.0.4 (renamed in 1.0.9) */
@ -302,77 +236,73 @@ struct png_struct_def
defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
/* Changed from png_byte to png_uint_32 at version 1.2.0 */
png_uint_32 mng_features_permitted PNG_DEPSTRUCT;
png_uint_32 mng_features_permitted;
#endif
/* New member added in libpng-1.0.7 */
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
png_fixed_point int_gamma PNG_DEPSTRUCT;
png_fixed_point int_gamma;
#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_DEPSTRUCT;
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 PNG_DEPSTRUCT; /* user supplied struct for
mem functions */
png_malloc_ptr malloc_fn PNG_DEPSTRUCT; /* function for
allocating memory */
png_free_ptr free_fn PNG_DEPSTRUCT; /* function for
freeing memory */
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 PNG_DEPSTRUCT; /* buffer to save current
(unfiltered) row */
png_bytep big_row_buf; /* buffer to save current (unfiltered) row */
#ifdef PNG_READ_DITHER_SUPPORTED
/* The following three members were added at version 1.0.14 and 1.2.4 */
png_bytep dither_sort PNG_DEPSTRUCT; /* working sort array */
png_bytep index_to_palette PNG_DEPSTRUCT; /* where the original
index currently is
png_bytep dither_sort; /* working sort array */
png_bytep index_to_palette; /* where the original index currently is
in the palette */
png_bytep palette_to_index PNG_DEPSTRUCT; /* which original index
points to this
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 PNG_DEPSTRUCT;
png_byte compression_type;
#ifdef PNG_USER_LIMITS_SUPPORTED
png_uint_32 user_width_max PNG_DEPSTRUCT;
png_uint_32 user_height_max PNG_DEPSTRUCT;
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 PNG_DEPSTRUCT;
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_uint_32 user_chunk_malloc_max PNG_DEPSTRUCT;
png_uint_32 user_chunk_malloc_max;
#endif
/* New member added in libpng-1.0.25 and 1.2.17 */
#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
/* Storage for unknown chunk that the library doesn't recognize. */
png_unknown_chunk unknown_chunk PNG_DEPSTRUCT;
png_unknown_chunk unknown_chunk;
#endif
/* New members added in libpng-1.2.26 */
png_uint_32 old_big_row_buf_size PNG_DEPSTRUCT;
png_uint_32 old_prev_row_size PNG_DEPSTRUCT;
png_uint_32 old_big_row_buf_size;
png_uint_32 old_prev_row_size;
/* New member added in libpng-1.2.30 */
png_charp chunkdata PNG_DEPSTRUCT; /* buffer for reading chunk data */
png_charp chunkdata; /* buffer for reading chunk data */
#ifdef PNG_IO_STATE_SUPPORTED
/* New member added in libpng-1.4.0 */
png_uint_32 io_state PNG_DEPSTRUCT;
png_uint_32 io_state;
#endif
};