| |
| /* png.h - header file for PNG reference library |
| |
| libpng 1.0 beta 6 - version 0.96 |
| For conditions of distribution and use, see copyright notice in png.h |
| Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. |
| Copyright (c) 1996, 1997 Andreas Dilger |
| May 12, 1997 |
| |
| BETA NOTICE: |
| This is a beta version. It reads and writes valid files on the |
| platforms I have, and has had a wide testing program. You may |
| have to modify the includes below to get it to work on your |
| system, and you may have to supply the correct compiler flags in |
| the makefile if you can't find a makefile suitable for your |
| operating system/compiler combination. Read libpng.txt for more |
| information, including how to contact the authors if you have any |
| problems, or if you want your compiler/platform to be supported in |
| the next official libpng release. |
| |
| See libpng.txt for more information. |
| |
| Contributing Authors: |
| John Bowler |
| Sam Bushell |
| Kevin Bracey |
| Andreas Dilger |
| Magnus Holmgren |
| Dave Martindale |
| Greg Roelofs |
| Guy Eric Schalnat |
| Paul Schmidt |
| Tom Tanner |
| Tim Wegner |
| |
| The contributing authors would like to thank all those who helped |
| with testing, bug fixes, and patience. This wouldn't have been |
| possible without all of you. |
| |
| Thanks to Frank J. T. Wojcik for helping with the documentation. |
| |
| The PNG Reference Library is supplied "AS IS". The Contributing Authors |
| and Group 42, Inc. disclaim all warranties, expressed or implied, |
| including, without limitation, the warranties of merchantability and of |
| fitness for any purpose. The Contributing Authors and Group 42, Inc. |
| assume no liability for direct, indirect, incidental, special, exemplary, |
| or consequential damages, which may result from the use of the PNG |
| Reference Library, even if advised of the possibility of such damage. |
| |
| Permission is hereby granted to use, copy, modify, and distribute this |
| source code, or portions hereof, for any purpose, without fee, subject |
| to the following restrictions: |
| 1. The origin of this source code must not be misrepresented. |
| 2. Altered versions must be plainly marked as such and must not be |
| misrepresented as being the original source. |
| 3. This Copyright notice may not be removed or altered from any source or |
| altered source distribution. |
| |
| The Contributing Authors and Group 42, Inc. specifically permit, without |
| fee, and encourage the use of this source code as a component to |
| supporting the PNG file format in commercial products. If you use this |
| source code in a product, acknowledgment is not required but would be |
| appreciated. |
| */ |
| |
| #ifndef _PNG_H |
| #define _PNG_H |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif /* __cplusplus */ |
| |
| /* This is not the place to learn how to use libpng. The file libpng.txt |
| * describes how to use libpng, and the file example.c summarizes it |
| * with some code on which to build. This file is useful for looking |
| * at the actual function definitions and structure components. |
| */ |
| |
| /* include the compression library's header */ |
| #include "zlib.h" |
| |
| /* include all user configurable info */ |
| #include "pngconf.h" |
| |
| /* This file is arranged in several sections. The first section contains |
| * structure and type definitions. The second section contains the external |
| * library functions, while the third has the internal library functions, |
| * which applications aren't expected to use directly. |
| */ |
| |
| /* Version information for png.h - this should match the version in png.c */ |
| #define PNG_LIBPNG_VER_STRING "0.96" |
| |
| /* careful here. At one time, I wanted to use 082, but that would be octal. |
| * Version 1.0 will be 100 here, etc. |
| */ |
| #define PNG_LIBPNG_VER 96 |
| |
| /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */ |
| #ifndef PNG_NO_EXTERN |
| /* Version information for C files, stored in png.c. This had better match |
| * the version above. |
| */ |
| extern char png_libpng_ver[]; |
| |
| /* Structures to facilitate easy interlacing. See png.c for more details */ |
| extern int FARDATA png_pass_start[]; |
| extern int FARDATA png_pass_inc[]; |
| extern int FARDATA png_pass_ystart[]; |
| extern int FARDATA png_pass_yinc[]; |
| extern int FARDATA png_pass_mask[]; |
| extern int FARDATA png_pass_dsp_mask[]; |
| /* These aren't currently used. If you need them, see png.c for more details |
| extern int FARDATA png_pass_width[]; |
| extern int FARDATA png_pass_height[]; |
| */ |
| #endif /* PNG_NO_EXTERN */ |
| |
| /* Three color definitions. The order of the red, green, and blue, (and the |
| * exact size) is not important, although the size of the fields need to |
| * be png_byte or png_uint_16 (as defined below). |
| */ |
| typedef struct png_color_struct |
| { |
| png_byte red; |
| png_byte green; |
| png_byte blue; |
| } png_color; |
| typedef png_color FAR * png_colorp; |
| typedef png_color FAR * FAR * png_colorpp; |
| |
| typedef struct png_color_16_struct |
| { |
| png_byte index; /* used for palette files */ |
| png_uint_16 red; /* for use in red green blue files */ |
| png_uint_16 green; |
| png_uint_16 blue; |
| png_uint_16 gray; /* for use in grayscale files */ |
| } png_color_16; |
| typedef png_color_16 FAR * png_color_16p; |
| typedef png_color_16 FAR * FAR * png_color_16pp; |
| |
| typedef struct png_color_8_struct |
| { |
| png_byte red; /* for use in red green blue files */ |
| png_byte green; |
| png_byte blue; |
| png_byte gray; /* for use in grayscale files */ |
| png_byte alpha; /* for alpha channel files */ |
| } png_color_8; |
| typedef png_color_8 FAR * png_color_8p; |
| typedef png_color_8 FAR * FAR * png_color_8pp; |
| |
| /* png_text holds the text in a PNG file, and whether they are compressed |
| in the PNG file or not. The "text" field points to a regular C string. */ |
| typedef struct png_text_struct |
| { |
| int compression; /* compression value, see PNG_TEXT_COMPRESSION_ */ |
| png_charp key; /* keyword, 1-79 character description of "text" */ |
| png_charp text; /* comment, may be an empty string (ie "") */ |
| png_size_t text_length; /* length of "text" field */ |
| } png_text; |
| typedef png_text FAR * png_textp; |
| typedef png_text FAR * FAR * png_textpp; |
| |
| /* Supported compression types for text in PNG files (tEXt, and zTXt). |
| * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */ |
| #define PNG_TEXT_COMPRESSION_NONE_WR -3 |
| #define PNG_TEXT_COMPRESSION_zTXt_WR -2 |
| #define PNG_TEXT_COMPRESSION_NONE -1 |
| #define PNG_TEXT_COMPRESSION_zTXt 0 |
| #define PNG_TEXT_COMPRESSION_LAST 1 /* Not a valid value */ |
| |
| /* png_time is a way to hold the time in an machine independent way. |
| Two conversions are provided, both from time_t and struct tm. There |
| is no portable way to convert to either of these structures, as far |
| as I know. If you know of a portable way, send it to me. As a side |
| note - PNG is Year 2000 compliant! */ |
| typedef struct png_time_struct |
| { |
| png_uint_16 year; /* full year, as in, 1995 */ |
| png_byte month; /* month of year, 1 - 12 */ |
| png_byte day; /* day of month, 1 - 31 */ |
| png_byte hour; /* hour of day, 0 - 23 */ |
| png_byte minute; /* minute of hour, 0 - 59 */ |
| png_byte second; /* second of minute, 0 - 60 (for leap seconds) */ |
| } png_time; |
| typedef png_time FAR * png_timep; |
| typedef png_time FAR * FAR * png_timepp; |
| |
| /* 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(). |
| * The names chosen should be very close to the PNG specification, so |
| * consult that document for information about the meaning of each field. |
| * |
| * With libpng < 0.95, it was only possible to directly set and read the |
| * the values in the png_info_struct, which meant that the contents and |
| * order of the values had to remain fixed. With libpng 0.95 and later, |
| * however, * there are now functions which abstract the contents of |
| * 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. |
| */ |
| typedef struct png_info_struct |
| { |
| /* the following are necessary for every PNG file */ |
| 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) */ |
| 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; /* number of data channels per pixel (1, 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 |
| * are writing, set the valid field to those chunks you want written, |
| * and initialize the appropriate fields below. |
| */ |
| |
| #if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED) |
| /* The gAMA chunk describes the gamma characteristics of the system |
| * 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; /* gamma value of image, if (valid & PNG_INFO_gAMA) */ |
| #endif /* PNG_READ_gAMA_SUPPORTED || PNG_WRITE_gAMA_SUPPORTED */ |
| #if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_WRITE_tEXt_SUPPORTED) || \ |
| defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED) |
| /* The tEXt and zTXt chunks contain human-readable textual data in |
| * uncompressed and compressed forms, respectively. The data in "text" |
| * is an array of pointers to uncompressed, null-terminated C strings. |
| * Each chunk has a keyword which describes the textual data contained |
| * in that chunk. Keywords are not required to be unique, and the text |
| * string may be empty. Any number of text chunks may be in an image. |
| */ |
| int num_text; /* number of comments read/to write */ |
| int max_text; /* current size of text array */ |
| png_textp text; /* array of comments read/to write */ |
| #endif /* PNG_READ_tEXt/zTXt_SUPPORTED || PNG_WRITE_tEXt/zTXt_SUPPORTED */ |
| #if defined(PNG_READ_tIME_SUPPORTED) || defined(PNG_WRITE_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; |
| #endif /* PNG_READ_tIME_SUPPORTED || PNG_WRITE_tIME_SUPPORTED */ |
| #if defined(PNG_READ_sBIT_SUPPORTED) || defined(PNG_WRITE_sBIT_SUPPORTED) |
| /* The sBIT chunk specifies the number of significant high-order bits |
| * in the pixel data. Values are in the range [1, bit_depth], and are |
| * only specified for the channels in the pixel data. The contents of |
| * the low-order bits is not specified. Data is valid if |
| * (valid & PNG_INFO_sBIT) is non-zero. |
| */ |
| png_color_8 sig_bit; /* significant bits in color channels */ |
| #endif /* PNG_READ_sBIT_SUPPORTED || PNG_WRITE_sBIT_SUPPORTED */ |
| #if defined(PNG_READ_tRNS_SUPPORTED) || defined(PNG_WRITE_tRNS_SUPPORTED) |
| /* The tRNS chunk supplies transparency data for paletted images and |
| * other image types that don't need a full alpha channel. There are |
| * "num_trans" transparency values for a paletted image, stored in the |
| * same order as the palette colors, starting from index 0. Values |
| * for the data are in the range [0, 255], ranging from fully transparent |
| * to fully opaque, respectively. For non-paletted images, there is a |
| * single color specified which should be treated as fully transparent. |
| * Data is valid if (valid & PNG_INFO_tRNS) is non-zero. |
| */ |
| png_bytep trans; /* transparent values for paletted image */ |
| png_color_16 trans_values; /* transparent color for non-palette image */ |
| #endif /* PNG_READ_tRNS_SUPPORTED || PNG_WRITE_tRNS_SUPPORTED */ |
| #if defined(PNG_READ_bKGD_SUPPORTED) || defined(PNG_WRITE_bKGD_SUPPORTED) |
| /* The bKGD chunk gives the suggested image background color if the |
| * display program does not have its own background color and the image |
| * is needs to composited onto a background before display. The colors |
| * 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; |
| #endif /* PNG_READ_bKGD_SUPPORTED || PNG_WRITE_bKGD_SUPPORTED */ |
| #if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED) |
| /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards |
| * and downwards from the top-left corner of the display, page, or other |
| * application-specific co-ordinate space. See the PNG_OFFSET_ defines |
| * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero. |
| */ |
| png_uint_32 x_offset; /* x offset on page */ |
| png_uint_32 y_offset; /* y offset on page */ |
| png_byte offset_unit_type; /* offset units type */ |
| #endif /* PNG_READ_oFFs_SUPPORTED || PNG_WRITE_oFFs_SUPPORTED */ |
| #if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED) |
| /* The pHYs chunk gives the physical pixel density of the image for |
| * 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; /* 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 /* PNG_READ_pHYs_SUPPORTED || PNG_WRITE_pHYs_SUPPORTED */ |
| #if defined(PNG_READ_hIST_SUPPORTED) || defined(PNG_WRITE_hIST_SUPPORTED) |
| /* The hIST chunk contains the relative frequency or importance of the |
| * various palette entries, so that a viewer can intelligently select a |
| * reduced-color palette, if required. Data is an array of "num_palette" |
| * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST) |
| * is non-zero. |
| */ |
| png_uint_16p hist; |
| #endif /* PNG_READ_hIST_SUPPORTED || PNG_WRITE_hIST_SUPPORTED */ |
| #if defined(PNG_READ_cHRM_SUPPORTED) || defined(PNG_WRITE_cHRM_SUPPORTED) |
| /* The cHRM chunk describes the CIE color characteristics of the monitor |
| * on which the PNG was created. This data allows the viewer to do gamut |
| * mapping of the input image to ensure that the viewer sees the same |
| * colors in the image as the creator. Values are in the range |
| * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero. |
| */ |
| 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 /* PNG_READ_cHRM_SUPPORTED || PNG_WRITE_cHRM_SUPPORTED */ |
| #if defined(PNG_READ_pCAL_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) |
| /* The pCAL chunk describes a transformation between the stored pixel |
| * values and original physcical data values used to create the image. |
| * The integer range [0, 2^bit_depth - 1] maps to the floating-point |
| * range given by [pcal_X0, pcal_X1], and are further transformed by a |
| * (possibly non-linear) transformation function given by "pcal_type" |
| * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_ |
| * defines below, and the PNG-Group's Scientific Visualization extension |
| * chunks document png-scivis-19970203 for a complete description of the |
| * transformations and how they should be implemented, as well as the |
| * png-extensions document for a description of the ASCII parameter |
| * strings. Data values are valid if (valid & PNG_INFO_pCAL) non-zero. |
| */ |
| 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 /* PNG_READ_pCAL_SUPPORTED || PNG_WRITE_pCAL_SUPPORTED */ |
| } png_info; |
| typedef png_info FAR * png_infop; |
| typedef png_info FAR * FAR * png_infopp; |
| |
| /* These describe the color_type field in png_info. */ |
| /* color type masks */ |
| #define PNG_COLOR_MASK_PALETTE 1 |
| #define PNG_COLOR_MASK_COLOR 2 |
| #define PNG_COLOR_MASK_ALPHA 4 |
| |
| /* color types. Note that not all combinations are legal */ |
| #define PNG_COLOR_TYPE_GRAY 0 |
| #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE) |
| #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR) |
| #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA) |
| #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA) |
| |
| /* This is for compression type. PNG 1.0 only defines the single type. */ |
| #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */ |
| #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE |
| |
| /* This is for filter type. PNG 1.0 only defines the single type. */ |
| #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */ |
| #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE |
| |
| /* These are for the interlacing type. These values should NOT be changed. */ |
| #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */ |
| #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */ |
| #define PNG_INTERLACE_LAST 2 /* Not a valid value */ |
| |
| /* These are for the oFFs chunk. These values should NOT be changed. */ |
| #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */ |
| #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */ |
| #define PNG_OFFSET_LAST 2 /* Not a valid value */ |
| |
| /* These are for the pCAL chunk. These values should NOT be changed. */ |
| #define PNG_EQUATION_LINEAR 0 /* Linear transformation */ |
| #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */ |
| #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */ |
| #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */ |
| #define PNG_EQUATION_LAST 4 /* Not a valid value */ |
| |
| /* These are for the pHYs chunk. These values should NOT be changed. */ |
| #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */ |
| #define PNG_RESOLUTION_METER 1 /* pixels/meter */ |
| #define PNG_RESOLUTION_LAST 2 /* Not a valid value */ |
| |
| /* These determine if an ancillary chunk's data has been successfully read |
| * from the PNG header, or if the application has filled in the corresponding |
| * data in the info_struct to be written into the output file. The values |
| * of the PNG_INFO_<chunk> defines should NOT be changed. |
| */ |
| #define PNG_INFO_gAMA 0x0001 |
| #define PNG_INFO_sBIT 0x0002 |
| #define PNG_INFO_cHRM 0x0004 |
| #define PNG_INFO_PLTE 0x0008 |
| #define PNG_INFO_tRNS 0x0010 |
| #define PNG_INFO_bKGD 0x0020 |
| #define PNG_INFO_hIST 0x0040 |
| #define PNG_INFO_pHYs 0x0080 |
| #define PNG_INFO_oFFs 0x0100 |
| #define PNG_INFO_tIME 0x0200 |
| #define PNG_INFO_pCAL 0x0400 |
| |
| /* This is used for the transformation routines, as some of them |
| * change these values for the row. It also should enable using |
| * the routines for other purposes. |
| */ |
| typedef struct png_row_info_struct |
| { |
| png_uint_32 width; /* width of row */ |
| png_size_t rowbytes; /* number of bytes in row */ |
| png_byte color_type; /* color type of row */ |
| png_byte bit_depth; /* bit depth of row */ |
| png_byte channels; /* number of channels (1, 2, 3, or 4) */ |
| png_byte pixel_depth; /* bits per pixel (depth * channels) */ |
| } png_row_info; |
| |
| typedef png_row_info FAR * png_row_infop; |
| typedef png_row_info FAR * FAR * png_row_infopp; |
| |
| /* These are the function types for the I/O functions, and the functions which |
| * modify the default I/O functions to user I/O functions. The png_error_ptr |
| * type should match that of user supplied warning and error functions, while |
| * the png_rw_ptr type should match that of the user read/write data functions. |
| */ |
| typedef struct png_struct_def png_struct; |
| typedef png_struct FAR * png_structp; |
| |
| typedef void (*png_error_ptr) PNGARG((png_structp, png_const_charp)); |
| typedef void (*png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t)); |
| typedef void (*png_flush_ptr) PNGARG((png_structp)); |
| #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
| typedef void (*png_progressive_info_ptr) PNGARG((png_structp, png_infop)); |
| typedef void (*png_progressive_end_ptr) PNGARG((png_structp, png_infop)); |
| typedef void (*png_progressive_row_ptr) PNGARG((png_structp, png_bytep, |
| png_uint_32, int)); |
| #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
| |
| /* 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. |
| */ |
| |
| struct png_struct_def |
| { |
| jmp_buf jmpbuf; /* used in png_error */ |
| |
| 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*/ |
| |
| png_uint_32 mode; /* tells us whre 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; /* 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; /* 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_size_t irowbytes; /* size of current interlaced 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; /* 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_byte filler; /* filler byte for 24->32-bit pixel expansion */ |
| #endif /* PNG_READ_FILLER_SUPPORTED */ |
| #if defined(PNG_READ_bKGD_SUPPORTED) |
| png_byte background_gamma_type; |
| float background_gamma; |
| png_color_16 background; /* background color in screen gamma space */ |
| #if defined(PNG_READ_GAMMA_SUPPORTED) |
| png_color_16 background_1; /* background normalized to gamma 1.0 */ |
| #endif /* PNG_READ_GAMMA && PNG_READ_bKGD_SUPPORTED */ |
| #endif /* PNG_READ_bKGD_SUPPORTED */ |
| #if defined(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 */ |
| #endif /* PNG_WRITE_FLUSH_SUPPORTED */ |
| #if defined(PNG_READ_GAMMA_SUPPORTED) |
| int gamma_shift; /* number of "insignificant" bits 16-bit gamma */ |
| float gamma; /* file gamma value */ |
| float display_gamma; /* display gamma value */ |
| #endif /* PNG_READ_GAMMA_SUPPORTED */ |
| #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
| 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 /* PNG_READ_GAMMA_SUPPORTED || PNG_WRITE_GAMMA_SUPPORTED */ |
| #if defined(PNG_READ_GAMMA_SUPPORTED) || defined (PNG_READ_sBIT_SUPPORTED) |
| png_color_8 sig_bit; /* significant bits in each available channel */ |
| #endif /* PNG_READ_GAMMA_SUPPORTED || PNG_READ_sBIT_SUPPORTED */ |
| #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) |
| png_color_8 shift; /* shift for significant bit tranformation */ |
| #endif /* PNG_READ_SHIFT_SUPPORTED || PNG_WRITE_SHIFT_SUPPORTED */ |
| #if defined(PNG_READ_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
| png_bytep trans; /* transparency values for paletted files */ |
| png_color_16 trans_values; /* transparency values for non-paletted files */ |
| #endif /* PNG_READ_tRNS_SUPPORTED || PNG_READ_BACKGROUND_SUPPORTED */ |
| #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 each 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 */ |
| #if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED) |
| 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_READ_tEXt/zTXt_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; |
| #endif /* PNG_PROGRESSIVE_READ_SUPPORTED&&__TURBOC__&&!_Windows&&!__FLAT__ */ |
| #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
| #if defined(PNG_READ_DITHER_SUPPORTED) |
| png_bytep palette_lookup; /* lookup table for dithering */ |
| png_bytep dither_index; /* index translation for palette files */ |
| png_uint_16p hist; /* histogram */ |
| #endif /* PNG_READ_DITHER_SUPPORTED */ |
| #if defined(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 /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ |
| }; |
| |
| typedef png_struct FAR * FAR * png_structpp; |
| |
| /* Here are the function definitions most commonly used. This is not |
| * the place to find out how to use libpng. See libpng.txt for the |
| * full explanation, see example.c for the summary. This just provides |
| * a simple one line of the use of each function. |
| */ |
| |
| /* Tell lib we have already handled the first <num_bytes> magic bytes. |
| * Handling more than 8 bytes from the beginning of the file is an error. |
| */ |
| extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr, |
| int num_bytes)); |
| |
| /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a |
| * PNG file. Returns zero if the supplied bytes match the 8-byte PNG |
| * signature, and non-zero otherwise. Having num_to_check == 0 or |
| * start > 7 will always fail (ie return non-zero). |
| */ |
| extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start, |
| png_size_t num_to_check)); |
| |
| /* Simple signature checking function. This is the same as calling |
| * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n). |
| */ |
| extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num)); |
| |
| /* Allocate and initialize png_ptr struct for reading, and any other memory. */ |
| extern PNG_EXPORT(png_structp,png_create_read_struct) |
| PNGARG((png_charp user_png_ver, voidp error_ptr, png_error_ptr error_fn, |
| png_error_ptr warn_fn)); |
| |
| /* Allocate and initialize png_ptr struct for reading, and any other memory */ |
| extern PNG_EXPORT(png_structp,png_create_write_struct) |
| PNGARG((png_const_charp user_png_ver, voidp error_ptr, |
| png_error_ptr error_fn, png_error_ptr warn_fn)); |
| |
| /* Allocate and initialize the info structure */ |
| extern PNG_EXPORT(png_infop,png_create_info_struct) |
| PNGARG((png_structp png_ptr)); |
| |
| /* Initialize the info structure (old interface - NOT DLL EXPORTED) */ |
| extern void png_info_init PNGARG((png_infop info_ptr)); |
| |
| /* Writes all the PNG information before the image. */ |
| extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| |
| /* read the information before the actual image data. */ |
| extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| |
| #if defined(PNG_WRITE_tIME_SUPPORTED) |
| /* convert from a struct tm to png_time */ |
| extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime, |
| struct tm FAR * ttime)); |
| |
| /* convert from time_t to png_time. Uses gmtime() */ |
| extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime, |
| time_t ttime)); |
| #endif /* PNG_WRITE_tIME_SUPPORTED */ |
| |
| #if defined(PNG_READ_EXPAND_SUPPORTED) |
| /* Expand data to 24 bit RGB, or 8 bit grayscale, with alpha if available. */ |
| extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr)); |
| #endif /* PNG_READ_EXPAND_SUPPORTED */ |
| |
| #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) |
| /* Use blue, green, red order for pixels. */ |
| extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr)); |
| #endif /* PNG_READ_BGR_SUPPORTED || PNG_WRITE_BGR_SUPPORTED */ |
| |
| #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) |
| /* Expand the grayscale to 24 bit RGB if necessary. */ |
| extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr)); |
| #endif /* PNG_READ_GRAY_TO_RGB_SUPPORTED */ |
| |
| #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) |
| /* Reduce RGB to grayscale. (Not yet implemented) */ |
| extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr)); |
| #endif /* PNG_READ_RGB_TO_GRAY_SUPPORTED */ |
| |
| extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth, |
| png_colorp palette)); |
| |
| #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED) |
| extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr)); |
| #endif /* PNG_READ_STRIP_ALPHA_SUPPORTED */ |
| |
| #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ |
| defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) |
| extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr)); |
| #endif /* PNG_READ_SWAP_ALPHA_SUPPORTED || PNG_WRITE_SWAP_ALPHA_SUPPORTED */ |
| |
| #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) |
| /* Add a filler byte to 24-bit RGB images. */ |
| extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr, |
| png_uint_32 filler, int flags)); |
| |
| /* The values of the PNG_FILLER_ defines should NOT be changed */ |
| #define PNG_FILLER_BEFORE 0 |
| #define PNG_FILLER_AFTER 1 |
| #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */ |
| |
| #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
| /* Swap bytes in 16 bit depth files. */ |
| extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr)); |
| #endif /* PNG_READ_SWAP_SUPPORTED || PNG_WRITE_SWAP_SUPPORTED */ |
| |
| #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) |
| /* Use 1 byte per pixel in 1, 2, or 4 bit depth files. */ |
| extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr)); |
| #endif /* PNG_READ_PACK_SUPPORTED || PNG_WRITE_PACK_SUPPORTED */ |
| |
| #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPOR) |
| /* Swap packing order of pixels in bytes. */ |
| extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr)); |
| #endif /* PNG_READ_PACKSWAP_SUPPORTED || PNG_WRITE_PACKSWAP_SUPPOR */ |
| |
| #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) |
| /* Converts files to legal bit depths. */ |
| extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr, |
| png_color_8p true_bits)); |
| #endif /* PNG_READ_SHIFT_SUPPORTED || PNG_WRITE_SHIFT_SUPPORTED */ |
| |
| #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ |
| defined(PNG_WRITE_INTERLACING_SUPPORTED) |
| /* Have the code handle the interlacing. Returns the number of passes. */ |
| extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr)); |
| #endif /* PNG_READ_INTERLACING_SUPPORTED || PNG_WRITE_INTERLACING_SUPPORTED */ |
| |
| #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) |
| /* Invert monocrome files */ |
| extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr)); |
| #endif /* PNG_READ_INVERT_SUPPORTED || PNG_WRITE_INVERT_SUPPORTED */ |
| |
| #if defined(PNG_READ_BACKGROUND_SUPPORTED) |
| /* Handle alpha and tRNS by replacing with a background color. */ |
| extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr, |
| png_color_16p background_color, int background_gamma_code, |
| int need_expand, double background_gamma)); |
| #define PNG_BACKGROUND_GAMMA_UNKNOWN 0 |
| #define PNG_BACKGROUND_GAMMA_SCREEN 1 |
| #define PNG_BACKGROUND_GAMMA_FILE 2 |
| #define PNG_BACKGROUND_GAMMA_UNIQUE 3 |
| #endif /* PNG_READ_BACKGROUND_SUPPORTED */ |
| |
| #if defined(PNG_READ_16_TO_8_SUPPORTED) |
| /* strip the second byte of information from a 16 bit depth file. */ |
| extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr)); |
| #endif /* PNG_READ_16_TO_8_SUPPORTED */ |
| |
| #if defined(PNG_READ_DITHER_SUPPORTED) |
| /* Turn on dithering, and reduce the palette to the number of colors available. */ |
| extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr, |
| png_colorp palette, int num_palette, int maximum_colors, |
| png_uint_16p histogram, int full_dither)); |
| #endif /* PNG_READ_DITHER_SUPPORTED */ |
| |
| #if defined(PNG_READ_GAMMA_SUPPORTED) |
| /* Handle gamma correction. */ |
| extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr, |
| double screen_gamma, double default_file_gamma)); |
| #endif /* PNG_READ_GAMMA_SUPPORTED */ |
| |
| #if defined(PNG_WRITE_FLUSH_SUPPORTED) |
| /* Set how many lines between output flushes - 0 for no flushing */ |
| extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows)); |
| |
| /* Flush the current PNG output buffer */ |
| extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr)); |
| #endif /* PNG_WRITE_FLUSH_SUPPORTED */ |
| |
| /* optional update palette with requested transformations */ |
| extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr)); |
| |
| /* optional call to update the users info structure */ |
| extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| |
| /* read a one or more rows of image data.*/ |
| extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr, |
| png_bytepp row, png_bytepp display_row, png_uint_32 num_rows)); |
| |
| /* read a row of data.*/ |
| extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr, |
| png_bytep row, |
| png_bytep display_row)); |
| |
| /* read the whole image into memory at once. */ |
| extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr, |
| png_bytepp image)); |
| |
| /* write a row of image data */ |
| extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr, |
| png_bytep row)); |
| |
| /* write a few rows of image data */ |
| extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr, |
| png_bytepp row, png_uint_32 num_rows)); |
| |
| /* write the image data */ |
| extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr, |
| png_bytepp image)); |
| |
| /* writes the end of the PNG file. */ |
| extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| |
| /* read the end of the PNG file. */ |
| extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| |
| /* free any memory associated with the png_info_struct */ |
| extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr, |
| png_infopp info_ptr_ptr)); |
| |
| /* free any memory associated with the png_struct and the png_info_structs */ |
| extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp |
| png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr)); |
| |
| /* free all memory used by the read (old method - NOT DLL EXPORTED) */ |
| extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_infop end_info_ptr)); |
| |
| /* free any memory associated with the png_struct and the png_info_structs */ |
| extern PNG_EXPORT(void,png_destroy_write_struct) |
| PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)); |
| |
| /* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */ |
| extern void png_write_destroy PNGARG((png_structp png_ptr)); |
| |
| /* set the libpng method of handling chunk CRC errors */ |
| extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr, |
| int crit_action, int ancil_action)); |
| |
| /* Values for png_set_crc_action() to say how to handle CRC errors in |
| * ancillary and critical chunks, and whether to use the data contained |
| * therein. Note that it is impossible to "discard" data in a critical |
| * chunk. For versions prior to 0.90, the action was always error/quit, |
| * whereas in version 0.90 and later, the action for CRC errors in ancillary |
| * chunks is warn/discard. These values should NOT be changed. |
| * |
| * value action:critical action:ancillary |
| */ |
| #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */ |
| #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */ |
| #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */ |
| #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */ |
| #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */ |
| #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */ |
| |
| /* These functions give the user control over the scan-line filtering in |
| * libpng and the compression methods used by zlib. These functions are |
| * mainly useful for testing, as the defaults should work with most users. |
| * Those users who are tight on memory or want faster performance at the |
| * expense of compression can modify them. See the compression library |
| * header file (zlib.h) for an explination of the compression functions. */ |
| |
| /* set the filtering method(s) used by libpng. Currently, the only valid |
| * value for "method" is 0 */ |
| extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method, |
| int filters)); |
| |
| /* Flags for png_set_filter() to say which filters to use. The flags |
| * are chosen so that they don't conflict with real filter types |
| * below, in case they are supplied instead of the #defined constants. |
| * These values should NOT be changed. |
| */ |
| #define PNG_NO_FILTERS 0x00 |
| #define PNG_FILTER_NONE 0x08 |
| #define PNG_FILTER_SUB 0x10 |
| #define PNG_FILTER_UP 0x20 |
| #define PNG_FILTER_AVG 0x40 |
| #define PNG_FILTER_PAETH 0x80 |
| #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \ |
| PNG_FILTER_AVG | PNG_FILTER_PAETH) |
| |
| /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now. |
| * These defines should NOT be changed. |
| */ |
| #define PNG_FILTER_VALUE_NONE 0 |
| #define PNG_FILTER_VALUE_SUB 1 |
| #define PNG_FILTER_VALUE_UP 2 |
| #define PNG_FILTER_VALUE_AVG 3 |
| #define PNG_FILTER_VALUE_PAETH 4 |
| #define PNG_FILTER_VALUE_LAST 5 |
| |
| #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */ |
| /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_ |
| * defines, either the default (minimum-sum-of-absolute-differences), or |
| * the experimental method (weighted-minimum-sum-of-absolute-differences). |
| * |
| * Weights are factors >= 1.0, indicating how important it is to keep the |
| * filter type consistent between rows. Larger numbers mean the current |
| * filter is that many times as likely to be the same as the "num_weights" |
| * previous filters. This is cumulative for each previous row with a weight. |
| * There needs to be "num_weights" values in "filter_weights", or it can be |
| * NULL if the weights aren't being specified. Weights have no influence on |
| * the selection of the first row filter. Well chosen weights can (in theory) |
| * improve the compression for a given image. |
| * |
| * Costs are factors >= 1.0 indicating the relative decoding costs of a |
| * filter type. Higher costs indicate more decoding expense, and are |
| * therefore less likely to be selected over a filter with lower computational |
| * costs. There needs to be a value in "filter_costs" for each valid filter |
| * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't |
| * setting the costs. Costs try to improve the speed of decompression without |
| * unduly increasing the compressed image size. |
| * |
| * A negative weight or cost indicates the default value is to be used, and |
| * values in the range [0.0, 1.0) indicate the value is to remain unchanged. |
| * The default values for both weights and costs are currently 1.0, but may |
| * change if good general weighting/cost heuristics can be found. If both |
| * the weights and costs are set to 1.0, this degenerates the WEIGHTED method |
| * to the UNWEIGHTED method, but with added encoding time/computation. |
| */ |
| extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr, |
| int heuristic_method, int num_weights, png_doublep filter_weights, |
| png_doublep filter_costs)); |
| #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ |
| |
| /* Heuristic used for row filter selection. These defines should NOT be |
| * changed. |
| */ |
| #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */ |
| #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */ |
| #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */ |
| #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */ |
| |
| /* Set the library compression level. Currently, valid values range from |
| * 0 - 9, corresponding directly to the zlib compression levels 0 - 9 |
| * (0 - no compression, 9 - "maximal" compression). Note that tests have |
| * shown that zlib compression levels 3-6 usually perform as well as level 9 |
| * for PNG images, and do considerably fewer caclulations. In the future, |
| * these values may not correspond directly to the zlib compression levels. |
| */ |
| extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr, |
| int level)); |
| |
| extern PNG_EXPORT(void,png_set_compression_mem_level) |
| PNGARG((png_structp png_ptr, int mem_level)); |
| |
| extern PNG_EXPORT(void,png_set_compression_strategy) |
| PNGARG((png_structp png_ptr, int strategy)); |
| |
| extern PNG_EXPORT(void,png_set_compression_window_bits) |
| PNGARG((png_structp png_ptr, int window_bits)); |
| |
| extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr, |
| int method)); |
| |
| /* These next functions are called for input/output, memory, and error |
| * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c, |
| * and call standard C I/O routines such as fread(), fwrite(), and |
| * fprintf(). These functions can be made to use other I/O routines |
| * at run time for those applications that need to handle I/O in a |
| * different manner by calling png_set_???_fn(). See libpng.txt for |
| * more information. |
| */ |
| |
| /* Initialize the input/output for the PNG file to the default functions. */ |
| extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, FILE *fp)); |
| |
| /* Replace the (error and abort), and warning functions with user |
| * supplied functions. If no messages are to be printed you must still |
| * write and use replacement functions. The replacement error_fn should |
| * still do a longjmp to the last setjmp location if you are using this |
| * method of error handling. If error_fn or warning_fn is NULL, the |
| * default function will be used. |
| */ |
| extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr, |
| png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn)); |
| |
| /* Return the user pointer associated with the error functions */ |
| extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr)); |
| |
| /* Replace the default data output functions with a user supplied one(s). |
| * If buffered output is not used, then output_flush_fn can be set to NULL. |
| * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time |
| * output_flush_fn will be ignored (and thus can be NULL). |
| */ |
| extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr, |
| png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)); |
| |
| /* Replace the default data input function with a user supplied one. */ |
| extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr, |
| png_voidp io_ptr, png_rw_ptr read_data_fn)); |
| |
| /* Return the user pointer associated with the I/O functions */ |
| extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr)); |
| |
| #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
| /* Sets the function callbacks for the push reader, and a pointer to a |
| * user-defined structure available to the callback functions. |
| */ |
| extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr, |
| png_voidp progressive_ptr, |
| png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, |
| png_progressive_end_ptr end_fn)); |
| |
| /* returns the user pointer associated with the push read functions */ |
| extern PNG_EXPORT(png_voidp,png_get_progressive_ptr) |
| PNGARG((png_structp png_ptr)); |
| |
| /* function to be called when data becomes available */ |
| extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_bytep buffer, png_size_t buffer_size)); |
| |
| /* function which combines rows. Not very much different than the |
| * png_combine_row() call. Is this even used????? |
| */ |
| extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr, |
| png_bytep old_row, png_bytep new_row)); |
| #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
| |
| extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr, |
| png_uint_32 size)); |
| |
| /* free's a pointer allocated by png_malloc() */ |
| extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr)); |
| |
| #if defined(USE_FAR_KEYWORD) /* memory model conversion function */ |
| extern void *far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,int check)); |
| #endif /* USE_FAR_KEYWORD */ |
| |
| /* Fatal error in PNG image of libpng - can't continue */ |
| extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr, |
| png_const_charp error)); |
| |
| /* Non-fatal error in libpng. Can continue, but may have a problem. */ |
| extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr, |
| png_const_charp message)); |
| |
| /* The png_set_<chunk> functions are for storing values in the png_info_struct. |
| * Similarly, the png_get_<chunk> calls are used to read values from the |
| * png_info_struct, either storing the parameters in the passed variables, or |
| * setting pointers into the png_info_struct where the data is stored. The |
| * png_get_<chunk> functions return a non-zero value if the data was available |
| * in info_ptr, or return zero and do not change any of the parameters if the |
| * data was not available. |
| * |
| * These functions should be used instead of directly accessing png_info |
| * to avoid problems with future changes in the size and internal layout of |
| * png_info_struct. |
| */ |
| /* Returns "flag" if chunk data is valid in info_ptr */ |
| extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_uint_32 flag)); |
| |
| /* Returns number of bytes needed to hold a transformed row */ |
| extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| |
| /* Returns number of color channels in image */ |
| extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| |
| /* Returns pointer to signature string read from PNG header */ |
| extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| |
| #if defined(PNG_READ_bKGD_SUPPORTED) |
| extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_color_16p *background)); |
| #endif /* PNG_READ_bKGD_SUPPORTED */ |
| |
| #if defined(PNG_READ_bKGD_SUPPORTED) || defined(PNG_WRITE_bKGD_SUPPORTED) |
| extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_color_16p background)); |
| #endif /* PNG_READ_bKGD_SUPPORTED || PNG_WRITE_bKGD_SUPPORTED */ |
| |
| #if defined(PNG_READ_cHRM_SUPPORTED) |
| extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, double *white_x, double *white_y, double *red_x, |
| double *red_y, double *green_x, double *green_y, double *blue_x, |
| double *blue_y)); |
| #endif /* PNG_READ_cHRM_SUPPORTED */ |
| |
| #if defined(PNG_READ_cHRM_SUPPORTED) || defined(PNG_WRITE_cHRM_SUPPORTED) |
| extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, double white_x, double white_y, double red_x, |
| double red_y, double green_x, double green_y, double blue_x, double blue_y)); |
| #endif /* PNG_READ_cHRM_SUPPORTED || PNG_WRITE_cHRM_SUPPORTED */ |
| |
| #if defined(PNG_READ_gAMA_SUPPORTED) |
| extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, double *file_gamma)); |
| #endif /* PNG_READ_gAMA_SUPPORTED */ |
| |
| #if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED) |
| extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, double file_gamma)); |
| #endif /* PNG_READ_gAMA_SUPPORTED || PNG_WRITE_gAMA_SUPPORTED */ |
| |
| #if defined(PNG_READ_hIST_SUPPORTED) |
| extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_uint_16p *hist)); |
| #endif /* PNG_READ_hIST_SUPPORTED */ |
| |
| #if defined(PNG_READ_hIST_SUPPORTED) || defined(PNG_WRITE_hIST_SUPPORTED) |
| extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_uint_16p hist)); |
| #endif /* PNG_READ_hIST_SUPPORTED || PNG_WRITE_hIST_SUPPORTED */ |
| |
| extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_uint_32 *width, png_uint_32 *height, |
| int *bit_depth, int *color_type, int *interlace_type, |
| int *compression_type, int *filter_type)); |
| |
| extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, |
| int color_type, int interlace_type, int compression_type, int filter_type)); |
| |
| #if defined(PNG_READ_oFFs_SUPPORTED) |
| extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_uint_32 *offset_x, png_uint_32 *offset_y, |
| int *unit_type)); |
| #endif /* PNG_READ_oFFs_SUPPORTED */ |
| |
| #if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED) |
| extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_uint_32 offset_x, png_uint_32 offset_y, |
| int unit_type)); |
| #endif /* PNG_READ_oFFs_SUPPORTED || PNG_WRITE_oFFs_SUPPORTED */ |
| |
| #if defined(PNG_READ_pCAL_SUPPORTED) |
| extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1, |
| int *type, int *nparams, png_charp *units, png_charpp *params)); |
| #endif /* PNG_READ_pCAL_SUPPORTED */ |
| |
| #if defined(PNG_READ_pCAL_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) |
| extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1, |
| int type, int nparams, png_charp units, png_charpp params)); |
| #endif /* PNG_READ_pCAL_SUPPORTED || PNG_WRITE_pCAL_SUPPORTED */ |
| |
| #if defined(PNG_READ_pHYs_SUPPORTED) |
| extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); |
| #endif /* PNG_READ_pHYs_SUPPORTED */ |
| |
| #if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED) |
| extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type)); |
| #endif /* PNG_READ_pHYs_SUPPORTED || PNG_WRITE_pHYs_SUPPORTED */ |
| |
| extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_colorp *palette, int *num_palette)); |
| |
| extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_colorp palette, int num_palette)); |
| |
| #if defined(PNG_READ_sBIT_SUPPORTED) |
| extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_color_8p *sig_bit)); |
| #endif /* PNG_READ_sBIT_SUPPORTED */ |
| |
| #if defined(PNG_READ_sBIT_SUPPORTED) || defined(PNG_WRITE_sBIT_SUPPORTED) |
| extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_color_8p sig_bit)); |
| #endif /* PNG_READ_sBIT_SUPPORTED || PNG_WRITE_sBIT_SUPPORTED */ |
| |
| #if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED) |
| /* png_get_text also returns the number of text chunks in text_ptr */ |
| extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_textp *text_ptr, int *num_text)); |
| #endif /* PNG_READ_tEXt_SUPPORTED || PNG_READ_zTXt_SUPPORTED */ |
| |
| #if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_WRITE_tEXt_SUPPORTED) || \ |
| defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED) |
| extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_textp text_ptr, int num_text)); |
| #endif /* PNG_READ_tEXt_SUPPORTED || PNG_WRITE_tEXt_SUPPORTED || |
| PNG_READ_zTXt_SUPPORTED || PNG_WRITE_zTXt_SUPPORTED */ |
| |
| #if defined(PNG_READ_tIME_SUPPORTED) |
| extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_timep *mod_time)); |
| #endif /* PNG_READ_tIME_SUPPORTED */ |
| |
| #if defined(PNG_READ_tIME_SUPPORTED) || defined(PNG_WRITE_tIME_SUPPORTED) |
| extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_timep mod_time)); |
| #endif /* PNG_READ_tIME_SUPPORTED || PNG_WRITE_tIME_SUPPORTED */ |
| |
| #if defined(PNG_READ_tRNS_SUPPORTED) |
| extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_bytep *trans, int *num_trans, |
| png_color_16p *trans_values)); |
| #endif /* PNG_READ_tRNS_SUPPORTED */ |
| |
| #if defined(PNG_READ_tRNS_SUPPORTED) || defined(PNG_WRITE_tRNS_SUPPORTED) |
| extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_bytep trans, int num_trans, |
| png_color_16p trans_values)); |
| #endif /* PNG_READ_tRNS_SUPPORTED || PNG_WRITE_tRNS_SUPPORTED */ |
| |
| /* Define PNG_DEBUG at compile time for debugging information. Higher |
| * numbers for PNG_DEBUG mean more debugging information. This has |
| * only been added since version 0.95 so it is not implemented throughout |
| * libpng yet, but more support will be added as needed. |
| */ |
| #if (PNG_DEBUG > 0) |
| #ifndef PNG_DEBUG_FILE |
| #define PNG_DEBUG_FILE stderr |
| #endif /* PNG_DEBUG_FILE */ |
| |
| #define png_debug(l,m) if (PNG_DEBUG > l) \ |
| fprintf(PNG_DEBUG_FILE,"%s"m,(l==1 ? "\t" : \ |
| (l==2 ? "\t\t":(l==3 ? "\t\t\t":"")))) |
| #define png_debug1(l,m,p1) if (PNG_DEBUG > l) \ |
| fprintf(PNG_DEBUG_FILE,"%s"m,(l==1 ? "\t" : \ |
| (l==2 ? "\t\t":(l==3 ? "\t\t\t":""))),p1) |
| #define png_debug2(l,m,p1,p2) if (PNG_DEBUG > l) \ |
| fprintf(PNG_DEBUG_FILE,"%s"m,(l==1 ? "\t" : \ |
| (l==2 ? "\t\t":(l==3 ? "\t\t\t":""))),p1,p2) |
| #else |
| #define png_debug(l, m) |
| #define png_debug1(l, m, p1) |
| #define png_debug2(l, m, p1, p2) |
| #endif /* (PNG_DEBUG > 0) */ |
| |
| /* These next functions are used internally in the code. They generally |
| * shouldn't be used unless you are writing code to add or replace some |
| * functionality in libpng. More information about most functions can |
| * be found in the files where the functions are located. |
| */ |
| |
| #if defined(PNG_INTERNAL) |
| |
| /* Various modes of operation. Note that after an init, mode is set to |
| zero automatically when the structure is created. */ |
| #define PNG_BEFORE_IHDR 0x00 |
| #define PNG_HAVE_IHDR 0x01 |
| #define PNG_HAVE_PLTE 0x02 |
| #define PNG_HAVE_IDAT 0x04 |
| #define PNG_AFTER_IDAT 0x08 |
| #define PNG_HAVE_IEND 0x10 |
| |
| /* push model modes */ |
| #define PNG_READ_SIG_MODE 0 |
| #define PNG_READ_CHUNK_MODE 1 |
| #define PNG_READ_IDAT_MODE 2 |
| #define PNG_SKIP_MODE 3 |
| #define PNG_READ_tEXt_MODE 4 |
| #define PNG_READ_zTXt_MODE 5 |
| #define PNG_READ_DONE_MODE 6 |
| #define PNG_ERROR_MODE 7 |
| |
| /* flags for the transformations the PNG library does on the image data */ |
| #define PNG_BGR 0x0001 |
| #define PNG_INTERLACE 0x0002 |
| #define PNG_PACK 0x0004 |
| #define PNG_SHIFT 0x0008 |
| #define PNG_SWAP_BYTES 0x0010 |
| #define PNG_INVERT_MONO 0x0020 |
| #define PNG_DITHER 0x0040 |
| #define PNG_BACKGROUND 0x0080 |
| #define PNG_BACKGROUND_EXPAND 0x0100 |
| #define PNG_RGB_TO_GRAY 0x0200 /* Not currently implemented */ |
| #define PNG_16_TO_8 0x0400 |
| #define PNG_RGBA 0x0800 |
| #define PNG_EXPAND 0x1000 |
| #define PNG_GAMMA 0x2000 |
| #define PNG_GRAY_TO_RGB 0x4000 |
| #define PNG_FILLER 0x8000 |
| #define PNG_PACKSWAP 0x10000 |
| #define PNG_SWAP_ALPHA 0x20000 |
| #define PNG_STRIP_ALPHA 0x40000 |
| |
| /* flags for png_create_struct */ |
| #define PNG_STRUCT_PNG 0x0001 |
| #define PNG_STRUCT_INFO 0x0002 |
| |
| /* Scaling factor for filter heuristic weighting calculations */ |
| #define PNG_WEIGHT_SHIFT 8 |
| #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) |
| #define PNG_COST_SHIFT 3 |
| #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) |
| |
| /* flags for the png_ptr->flags rather than declaring a byte for each one */ |
| #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 |
| #define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002 |
| #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004 |
| #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008 |
| #define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010 |
| #define PNG_FLAG_ZLIB_FINISHED 0x0020 |
| #define PNG_FLAG_ROW_INIT 0x0040 |
| #define PNG_FLAG_FILLER_AFTER 0x0080 |
| #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 |
| #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 |
| #define PNG_FLAG_CRC_CRITICAL_USE 0x0400 |
| #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 |
| #define PNG_FLAG_FREE_PALETTE 0x1000 |
| #define PNG_FLAG_FREE_TRANS 0x2000 |
| #define PNG_FLAG_FREE_HIST 0x4000 |
| #define PNG_FLAG_HAVE_CHUNK_HEADER 0x8000 |
| #define PNG_FLAG_WROTE_tIME 0x10000 |
| |
| #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ |
| PNG_FLAG_CRC_ANCILLARY_NOWARN) |
| |
| #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ |
| PNG_FLAG_CRC_CRITICAL_IGNORE) |
| |
| #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ |
| PNG_FLAG_CRC_CRITICAL_MASK) |
| |
| /* save typing and make code easier to understand */ |
| #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ |
| abs((int)((c1).green) - (int)((c2).green)) + \ |
| abs((int)((c1).blue) - (int)((c2).blue))) |
| |
| /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */ |
| #ifndef PNG_NO_EXTERN |
| /* place to hold the signiture string for a PNG file. */ |
| extern png_byte FARDATA png_sig[]; |
| |
| /* constant strings for known chunk types. If you need to add a chunk, |
| add a string holding the name here. See png.c for more details. We |
| can't selectively include these, since we still check for chunk in the |
| wrong locations with these labels. */ |
| extern png_byte FARDATA png_IHDR[]; |
| extern png_byte FARDATA png_IDAT[]; |
| extern png_byte FARDATA png_IEND[]; |
| extern png_byte FARDATA png_PLTE[]; |
| extern png_byte FARDATA png_bKGD[]; |
| extern png_byte FARDATA png_cHRM[]; |
| extern png_byte FARDATA png_gAMA[]; |
| extern png_byte FARDATA png_hIST[]; |
| extern png_byte FARDATA png_oFFs[]; |
| extern png_byte FARDATA png_pCAL[]; |
| extern png_byte FARDATA png_pHYs[]; |
| extern png_byte FARDATA png_sBIT[]; |
| extern png_byte FARDATA png_tEXt[]; |
| extern png_byte FARDATA png_tIME[]; |
| extern png_byte FARDATA png_tRNS[]; |
| extern png_byte FARDATA png_zTXt[]; |
| |
| #endif /* PNG_NO_EXTERN */ |
| |
| /* Inline macros to do direct reads of bytes from the input buffer. These |
| * require that you are using an architecture that uses PNG byte ordering |
| * (MSB first) and supports unaligned data storage. I think that PowerPC |
| * in big-endian mode and 680x0 are the only ones that will support this. |
| * The x86 line of processors definitely do not. The png_get_int_32() |
| * routine also assumes we are using two's complement format for negative |
| * values, which is almost certainly true. |
| */ |
| #if defined(PNG_READ_BIG_ENDIAN_SUPPORTED) |
| #if defined(PNG_READ_pCAL_SUPPORTED) |
| #define png_get_int_32(buf) ( *((png_int_32p) (buf))) |
| #endif /* PNG_READ_pCAL_SUPPORTED */ |
| #define png_get_uint_32(buf) ( *((png_uint_32p) (buf))) |
| #define png_get_uint_16(buf) ( *((png_uint_16p) (buf))) |
| #else |
| #if defined(PNG_READ_pCAL_SUPPORTED) |
| PNG_EXTERN png_int_32 png_get_int_32 PNGARG((png_bytep buf)); |
| #endif /* PNG_READ_pCAL_SUPPORTED */ |
| PNG_EXTERN png_uint_32 png_get_uint_32 PNGARG((png_bytep buf)); |
| PNG_EXTERN png_uint_16 png_get_uint_16 PNGARG((png_bytep buf)); |
| #endif /* PNG_BIG_ENDIAN_GET_SUPPORTED */ |
| |
| /* Initialize png_ptr struct for reading, and allocate any other memory |
| * (old interface - NOT DLL EXPORTED) */ |
| extern void png_read_init PNGARG((png_structp png_ptr)); |
| |
| /* Initialize png_ptr struct for writing, and allocate any other memory |
| * (old interface - NOT DLL EXPORTED) */ |
| extern void png_write_init PNGARG((png_structp png_ptr)); |
| |
| /* allocate memory for an internal libpng struct */ |
| PNG_EXTERN png_voidp png_create_struct PNGARG((int type)); |
| |
| /* free memory from internal libpng struct */ |
| PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr)); |
| |
| /* free any memory that info_ptr points to and reset struct. */ |
| PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| |
| /* Function to allocate memory for zlib. */ |
| PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size)); |
| |
| /* function to free memory for zlib */ |
| PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr)); |
| |
| /* reset the CRC variable */ |
| PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr)); |
| |
| /* Write the "data" buffer to whatever output you are using. */ |
| PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data, |
| png_size_t length)); |
| |
| /* Read data from whatever input you are using into the "data" buffer */ |
| PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data, |
| png_size_t length)); |
| |
| /* read bytes into buf, and update png_ptr->crc */ |
| PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf, |
| png_size_t length)); |
| |
| /* read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ |
| PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip)); |
| |
| /* read the CRC from the file and compare it to the libpng calculated CRC */ |
| PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr)); |
| |
| /* Calculate the CRC over a section of data. Note that we are only |
| * passing a maximum of 64K on systems that have this as a memory limit, |
| * since this is the maximum buffer size we can specify. |
| */ |
| PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr, |
| png_size_t length)); |
| |
| #if defined(PNG_WRITE_FLUSH_SUPPORTED) |
| PNG_EXTERN void png_flush PNGARG((png_structp png_ptr)); |
| #endif |
| |
| /* Place a 32-bit number into a buffer in PNG byte order (big-endian). |
| * The only currently known PNG chunk that uses unsigned numbers is |
| * the ancillary extension chunk, pCAL. |
| */ |
| PNG_EXTERN void png_save_uint_32 PNGARG((png_bytep buf, png_uint_32 i)); |
| |
| #if defined(PNG_WRITE_pCAL_SUPPORTED) |
| PNG_EXTERN void png_save_int_32 PNGARG((png_bytep buf, png_int_32 i)); |
| #endif |
| |
| /* place a 16 bit number into a buffer in PNG byte order */ |
| PNG_EXTERN void png_save_uint_16 PNGARG((png_bytep buf, png_uint_16 i)); |
| |
| /* Write a PNG chunk - size, type, (optional) data, CRC. */ |
| PNG_EXTERN void png_write_chunk PNGARG((png_structp png_ptr, |
| png_bytep chunk_name, png_bytep data, png_size_t length)); |
| |
| /* Write the start of a PNG chunk - length and chunk name. */ |
| PNG_EXTERN void png_write_chunk_start PNGARG((png_structp png_ptr, |
| png_bytep chunk_name, png_uint_32 length)); |
| |
| /* Write the data of a PNG chunk started with png_write_chunk_start(). */ |
| PNG_EXTERN void png_write_chunk_data PNGARG((png_structp png_ptr, |
| png_bytep data, png_size_t length)); |
| |
| /* Finish a chunk started with png_write_chunk_start() (includes CRC). */ |
| PNG_EXTERN void png_write_chunk_end PNGARG((png_structp png_ptr)); |
| |
| /* simple function to write the signiture */ |
| PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr)); |
| |
| /* write various chunks */ |
| |
| /* Write the IHDR chunk, and update the png_struct with the necessary |
| information. */ |
| PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width, |
| png_uint_32 height, |
| int bit_depth, int color_type, int compression_type, int filter_type, |
| int interlace_type)); |
| |
| PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette, |
| png_uint_32 num_pal)); |
| |
| PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data, |
| png_size_t length)); |
| |
| PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr)); |
| |
| #if defined(PNG_WRITE_gAMA_SUPPORTED) |
| PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma)); |
| #endif |
| |
| #if defined(PNG_WRITE_sBIT_SUPPORTED) |
| PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit, |
| int color_type)); |
| #endif |
| |
| #if defined(PNG_WRITE_cHRM_SUPPORTED) |
| PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr, |
| double white_x, double white_y, |
| double red_x, double red_y, double green_x, double green_y, |
| double blue_x, double blue_y)); |
| #endif |
| |
| #if defined(PNG_WRITE_tRNS_SUPPORTED) |
| PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans, |
| png_color_16p values, int number, int color_type)); |
| #endif |
| |
| #if defined(PNG_WRITE_bKGD_SUPPORTED) |
| PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr, |
| png_color_16p values, int color_type)); |
| #endif |
| |
| #if defined(PNG_WRITE_hIST_SUPPORTED) |
| PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist, |
| png_uint_32 num_hist)); |
| #endif |
| |
| #if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED) |
| PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr, |
| png_charp key, png_bytepp new_key)); |
| #endif |
| |
| #if defined(PNG_WRITE_tEXt_SUPPORTED) |
| PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key, |
| png_charp text, png_size_t text_len)); |
| #endif |
| |
| #if defined(PNG_WRITE_zTXt_SUPPORTED) |
| PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key, |
| png_charp text, png_size_t text_len, int compression)); |
| #endif |
| |
| #if defined(PNG_WRITE_oFFs_SUPPORTED) |
| PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr, |
| png_uint_32 x_offset, png_uint_32 y_offset, int unit_type)); |
| #endif |
| |
| #if defined(PNG_WRITE_pCAL_SUPPORTED) |
| PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose, |
| png_int_32 X0, png_int_32 X1, int type, int nparams, |
| png_charp units, png_charpp params)); |
| #endif |
| |
| #if defined(PNG_WRITE_pHYs_SUPPORTED) |
| PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr, |
| png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, |
| int unit_type)); |
| #endif |
| |
| #if defined(PNG_WRITE_tIME_SUPPORTED) |
| PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr, |
| png_timep mod_time)); |
| #endif |
| |
| /* Called when finished processing a row of data */ |
| PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr)); |
| |
| /* Internal use only. Called before first row of data */ |
| PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr)); |
| |
| #if defined(PNG_READ_GAMMA_SUPPORTED) |
| PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr)); |
| #endif |
| |
| /* combine a row of data, dealing with alpha, etc. if requested */ |
| PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row, |
| int mask)); |
| |
| #if defined(PNG_READ_INTERLACING_SUPPORTED) |
| /* expand an interlaced row */ |
| PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info, |
| png_bytep row, int pass, png_uint_32 transformations)); |
| #endif |
| |
| #if defined(PNG_WRITE_INTERLACING_SUPPORTED) |
| /* grab pixels out of a row for an interlaced pass */ |
| PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info, |
| png_bytep row, int pass)); |
| #endif |
| |
| /* unfilter a row */ |
| PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr, |
| png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter)); |
| |
| /* Choose the best filter to use and filter the row data */ |
| PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr, |
| png_row_infop row_info)); |
| |
| /* Write out the filtered row. */ |
| PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr, |
| png_bytep filtered_row)); |
| /* finish a row while reading, dealing with interlacing passes, etc. */ |
| PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr)); |
| |
| /* initialize the row buffers, etc. */ |
| PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr)); |
| /* optional call to update the users info structure */ |
| PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| |
| /* these are the functions that do the transformations */ |
| #if defined(PNG_READ_FILLER_SUPPORTED) |
| PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info, |
| png_bytep row, png_uint_32 filler, png_uint_32 flags)); |
| #endif |
| |
| #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) |
| PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info, |
| png_bytep row)); |
| #endif |
| |
| #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) |
| PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info, |
| png_bytep row)); |
| #endif |
| |
| #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ |
| defined(PNG_READ_STRIP_ALPHA_SUPPORTED) |
| PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info, |
| png_bytep row, png_uint_32 flags)); |
| #endif |
| |
| #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
| PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row)); |
| #endif |
| |
| #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPOR) |
| PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row)); |
| #endif |
| |
| #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) |
| PNG_EXTERN void png_do_rgb_to_gray PNGARG((png_row_infop row_info, |
| png_bytep row)); |
| #endif |
| |
| #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) |
| PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info, |
| png_bytep row)); |
| #endif |
| |
| #if defined(PNG_READ_PACK_SUPPORTED) |
| PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row)); |
| #endif |
| |
| #if defined(PNG_READ_SHIFT_SUPPORTED) |
| PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row, |
| png_color_8p sig_bits)); |
| #endif |
| |
| #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) |
| PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row)); |
| #endif |
| |
| #if defined(PNG_READ_16_TO_8_SUPPORTED) |
| PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row)); |
| #endif |
| |
| #if defined(PNG_READ_DITHER_SUPPORTED) |
| PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info, |
| png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup)); |
| |
| # if defined(PNG_CORRECT_PALETTE_SUPPORTED) |
| PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr, |
| png_colorp palette, int num_palette)); |
| # endif |
| #endif |
| |
| #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) |
| PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row)); |
| #endif |
| |
| #if defined(PNG_WRITE_PACK_SUPPORTED) |
| PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info, |
| png_bytep row, png_uint_32 bit_depth)); |
| #endif |
| |
| #if defined(PNG_WRITE_SHIFT_SUPPORTED) |
| PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row, |
| png_color_8p bit_depth)); |
| #endif |
| |
| #if defined(PNG_READ_BACKGROUND_SUPPORTED) |
| PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, |
| png_color_16p trans_values, png_color_16p background, |
| png_color_16p background_1, |
| png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1, |
| png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1, |
| png_uint_16pp gamma_16_to_1, int gamma_shift)); |
| #endif |
| |
| #if defined(PNG_READ_GAMMA_SUPPORTED) |
| PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row, |
| png_bytep gamma_table, png_uint_16pp gamma_16_table, |
| int gamma_shift)); |
| #endif |
| |
| #if defined(PNG_READ_EXPAND_SUPPORTED) |
| PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info, |
| png_bytep row, png_colorp palette, png_bytep trans, int num_trans)); |
| PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info, |
| png_bytep row, png_color_16p trans_value)); |
| #endif |
| |
| /* The following decodes the appropriate chunks, and does error correction, |
| * then calls the appropriate callback for the chunk if it is valid */ |
| |
| /* decode the IHDR chunk */ |
| PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| |
| #if defined(PNG_READ_gAMA_SUPPORTED) |
| PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| #endif |
| |
| #if defined(PNG_READ_sBIT_SUPPORTED) |
| PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| #endif |
| |
| #if defined(PNG_READ_cHRM_SUPPORTED) |
| PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| #endif |
| |
| #if defined(PNG_READ_tRNS_SUPPORTED) |
| PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| #endif |
| |
| #if defined(PNG_READ_bKGD_SUPPORTED) |
| PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| #endif |
| |
| #if defined(PNG_READ_hIST_SUPPORTED) |
| PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| #endif |
| |
| #if defined(PNG_READ_oFFs_SUPPORTED) |
| PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| #endif |
| |
| #if defined(PNG_READ_pCAL_SUPPORTED) |
| PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| #endif |
| |
| #if defined(PNG_READ_pHYs_SUPPORTED) |
| PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| #endif |
| |
| #if defined(PNG_READ_tIME_SUPPORTED) |
| PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| #endif |
| |
| #if defined(PNG_READ_tEXt_SUPPORTED) |
| PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| #endif |
| |
| #if defined(PNG_READ_zTXt_SUPPORTED) |
| PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 length)); |
| #endif |
| |
| PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_uint_32 length)); |
| |
| PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr, |
| png_bytep chunk_name)); |
| |
| /* handle the transformations for reading and writing */ |
| PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr)); |
| PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr)); |
| |
| PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr)); |
| |
| #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
| PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr)); |
| PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr, |
| png_uint_32 length)); |
| PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr)); |
| PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr, |
| png_bytep buffer, png_size_t length)); |
| PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr)); |
| PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr, |
| png_bytep buffer, png_size_t buffer_length)); |
| PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr)); |
| PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr, |
| png_bytep buffer, png_size_t buffer_length)); |
| PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr)); |
| PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_uint_32 length)); |
| PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row)); |
| PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr)); |
| #if defined(PNG_READ_tEXt_SUPPORTED) |
| PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_uint_32 length)); |
| PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| #endif |
| #if defined(PNG_READ_zTXt_SUPPORTED) |
| PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_uint_32 length)); |
| PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| #endif |
| |
| #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
| |
| #endif /* PNG_INTERNAL */ |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| /* do not put anything past this line */ |
| #endif /* _PNG_H */ |
