13965825b97a5809454f5810f7e603cbd02daa036scroggo 23965825b97a5809454f5810f7e603cbd02daa036scroggo/* pnginfo.h - header file for PNG reference library 33965825b97a5809454f5810f7e603cbd02daa036scroggo * 43965825b97a5809454f5810f7e603cbd02daa036scroggo * Last changed in libpng 1.6.1 [March 28, 2013] 53965825b97a5809454f5810f7e603cbd02daa036scroggo * Copyright (c) 1998-2002,2004,2006-2013 Glenn Randers-Pehrson 63965825b97a5809454f5810f7e603cbd02daa036scroggo * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) 73965825b97a5809454f5810f7e603cbd02daa036scroggo * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) 83965825b97a5809454f5810f7e603cbd02daa036scroggo * 93965825b97a5809454f5810f7e603cbd02daa036scroggo * This code is released under the libpng license. 103965825b97a5809454f5810f7e603cbd02daa036scroggo * For conditions of distribution and use, see the disclaimer 113965825b97a5809454f5810f7e603cbd02daa036scroggo * and license in png.h 123965825b97a5809454f5810f7e603cbd02daa036scroggo */ 133965825b97a5809454f5810f7e603cbd02daa036scroggo 143965825b97a5809454f5810f7e603cbd02daa036scroggo /* png_info is a structure that holds the information in a PNG file so 153965825b97a5809454f5810f7e603cbd02daa036scroggo * that the application can find out the characteristics of the image. 163965825b97a5809454f5810f7e603cbd02daa036scroggo * If you are reading the file, this structure will tell you what is 173965825b97a5809454f5810f7e603cbd02daa036scroggo * in the PNG file. If you are writing the file, fill in the information 183965825b97a5809454f5810f7e603cbd02daa036scroggo * you want to put into the PNG file, using png_set_*() functions, then 193965825b97a5809454f5810f7e603cbd02daa036scroggo * call png_write_info(). 203965825b97a5809454f5810f7e603cbd02daa036scroggo * 213965825b97a5809454f5810f7e603cbd02daa036scroggo * The names chosen should be very close to the PNG specification, so 223965825b97a5809454f5810f7e603cbd02daa036scroggo * consult that document for information about the meaning of each field. 233965825b97a5809454f5810f7e603cbd02daa036scroggo * 243965825b97a5809454f5810f7e603cbd02daa036scroggo * With libpng < 0.95, it was only possible to directly set and read the 253965825b97a5809454f5810f7e603cbd02daa036scroggo * the values in the png_info_struct, which meant that the contents and 263965825b97a5809454f5810f7e603cbd02daa036scroggo * order of the values had to remain fixed. With libpng 0.95 and later, 273965825b97a5809454f5810f7e603cbd02daa036scroggo * however, there are now functions that abstract the contents of 283965825b97a5809454f5810f7e603cbd02daa036scroggo * png_info_struct from the application, so this makes it easier to use 293965825b97a5809454f5810f7e603cbd02daa036scroggo * libpng with dynamic libraries, and even makes it possible to use 303965825b97a5809454f5810f7e603cbd02daa036scroggo * libraries that don't have all of the libpng ancillary chunk-handing 313965825b97a5809454f5810f7e603cbd02daa036scroggo * functionality. In libpng-1.5.0 this was moved into a separate private 323965825b97a5809454f5810f7e603cbd02daa036scroggo * file that is not visible to applications. 333965825b97a5809454f5810f7e603cbd02daa036scroggo * 343965825b97a5809454f5810f7e603cbd02daa036scroggo * The following members may have allocated storage attached that should be 353965825b97a5809454f5810f7e603cbd02daa036scroggo * cleaned up before the structure is discarded: palette, trans, text, 363965825b97a5809454f5810f7e603cbd02daa036scroggo * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile, 373965825b97a5809454f5810f7e603cbd02daa036scroggo * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these 383965825b97a5809454f5810f7e603cbd02daa036scroggo * are automatically freed when the info structure is deallocated, if they were 393965825b97a5809454f5810f7e603cbd02daa036scroggo * allocated internally by libpng. This behavior can be changed by means 403965825b97a5809454f5810f7e603cbd02daa036scroggo * of the png_data_freer() function. 413965825b97a5809454f5810f7e603cbd02daa036scroggo * 423965825b97a5809454f5810f7e603cbd02daa036scroggo * More allocation details: all the chunk-reading functions that 433965825b97a5809454f5810f7e603cbd02daa036scroggo * change these members go through the corresponding png_set_* 443965825b97a5809454f5810f7e603cbd02daa036scroggo * functions. A function to clear these members is available: see 453965825b97a5809454f5810f7e603cbd02daa036scroggo * png_free_data(). The png_set_* functions do not depend on being 463965825b97a5809454f5810f7e603cbd02daa036scroggo * able to point info structure members to any of the storage they are 473965825b97a5809454f5810f7e603cbd02daa036scroggo * passed (they make their own copies), EXCEPT that the png_set_text 483965825b97a5809454f5810f7e603cbd02daa036scroggo * functions use the same storage passed to them in the text_ptr or 493965825b97a5809454f5810f7e603cbd02daa036scroggo * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns 503965825b97a5809454f5810f7e603cbd02daa036scroggo * functions do not make their own copies. 513965825b97a5809454f5810f7e603cbd02daa036scroggo */ 523965825b97a5809454f5810f7e603cbd02daa036scroggo#ifndef PNGINFO_H 533965825b97a5809454f5810f7e603cbd02daa036scroggo#define PNGINFO_H 543965825b97a5809454f5810f7e603cbd02daa036scroggo 553965825b97a5809454f5810f7e603cbd02daa036scroggostruct png_info_def 563965825b97a5809454f5810f7e603cbd02daa036scroggo{ 573965825b97a5809454f5810f7e603cbd02daa036scroggo /* The following are necessary for every PNG file */ 583965825b97a5809454f5810f7e603cbd02daa036scroggo png_uint_32 width; /* width of image in pixels (from IHDR) */ 593965825b97a5809454f5810f7e603cbd02daa036scroggo png_uint_32 height; /* height of image in pixels (from IHDR) */ 603965825b97a5809454f5810f7e603cbd02daa036scroggo png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */ 613965825b97a5809454f5810f7e603cbd02daa036scroggo png_size_t rowbytes; /* bytes needed to hold an untransformed row */ 623965825b97a5809454f5810f7e603cbd02daa036scroggo png_colorp palette; /* array of color values (valid & PNG_INFO_PLTE) */ 633965825b97a5809454f5810f7e603cbd02daa036scroggo png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */ 643965825b97a5809454f5810f7e603cbd02daa036scroggo png_uint_16 num_trans; /* number of transparent palette color (tRNS) */ 653965825b97a5809454f5810f7e603cbd02daa036scroggo png_byte bit_depth; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */ 663965825b97a5809454f5810f7e603cbd02daa036scroggo png_byte color_type; /* see PNG_COLOR_TYPE_ below (from IHDR) */ 673965825b97a5809454f5810f7e603cbd02daa036scroggo /* The following three should have been named *_method not *_type */ 683965825b97a5809454f5810f7e603cbd02daa036scroggo png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */ 693965825b97a5809454f5810f7e603cbd02daa036scroggo png_byte filter_type; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */ 703965825b97a5809454f5810f7e603cbd02daa036scroggo png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ 713965825b97a5809454f5810f7e603cbd02daa036scroggo 723965825b97a5809454f5810f7e603cbd02daa036scroggo /* The following are set by png_set_IHDR, called from the application on 733965825b97a5809454f5810f7e603cbd02daa036scroggo * write, but the are never actually used by the write code. 743965825b97a5809454f5810f7e603cbd02daa036scroggo */ 753965825b97a5809454f5810f7e603cbd02daa036scroggo png_byte channels; /* number of data channels per pixel (1, 2, 3, 4) */ 763965825b97a5809454f5810f7e603cbd02daa036scroggo png_byte pixel_depth; /* number of bits per pixel */ 773965825b97a5809454f5810f7e603cbd02daa036scroggo png_byte spare_byte; /* to align the data, and for future use */ 783965825b97a5809454f5810f7e603cbd02daa036scroggo 793965825b97a5809454f5810f7e603cbd02daa036scroggo#ifdef PNG_READ_SUPPORTED 803965825b97a5809454f5810f7e603cbd02daa036scroggo /* This is never set during write */ 813965825b97a5809454f5810f7e603cbd02daa036scroggo png_byte signature[8]; /* magic bytes read by libpng from start of file */ 823965825b97a5809454f5810f7e603cbd02daa036scroggo#endif 833965825b97a5809454f5810f7e603cbd02daa036scroggo 843965825b97a5809454f5810f7e603cbd02daa036scroggo /* The rest of the data is optional. If you are reading, check the 853965825b97a5809454f5810f7e603cbd02daa036scroggo * valid field to see if the information in these are valid. If you 863965825b97a5809454f5810f7e603cbd02daa036scroggo * are writing, set the valid field to those chunks you want written, 873965825b97a5809454f5810f7e603cbd02daa036scroggo * and initialize the appropriate fields below. 883965825b97a5809454f5810f7e603cbd02daa036scroggo */ 893965825b97a5809454f5810f7e603cbd02daa036scroggo 903965825b97a5809454f5810f7e603cbd02daa036scroggo#if defined(PNG_COLORSPACE_SUPPORTED) || defined(PNG_GAMMA_SUPPORTED) 913965825b97a5809454f5810f7e603cbd02daa036scroggo /* png_colorspace only contains 'flags' if neither GAMMA or COLORSPACE are 923965825b97a5809454f5810f7e603cbd02daa036scroggo * defined. When COLORSPACE is switched on all the colorspace-defining 933965825b97a5809454f5810f7e603cbd02daa036scroggo * chunks should be enabled, when GAMMA is switched on all the gamma-defining 943965825b97a5809454f5810f7e603cbd02daa036scroggo * chunks should be enabled. If this is not done it becomes possible to read 953965825b97a5809454f5810f7e603cbd02daa036scroggo * inconsistent PNG files and assign a probably incorrect interpretation to 963965825b97a5809454f5810f7e603cbd02daa036scroggo * the information. (In other words, by carefully choosing which chunks to 973965825b97a5809454f5810f7e603cbd02daa036scroggo * recognize the system configuration can select an interpretation for PNG 983965825b97a5809454f5810f7e603cbd02daa036scroggo * files containing ambiguous data and this will result in inconsistent 993965825b97a5809454f5810f7e603cbd02daa036scroggo * behavior between different libpng builds!) 1003965825b97a5809454f5810f7e603cbd02daa036scroggo */ 1013965825b97a5809454f5810f7e603cbd02daa036scroggo png_colorspace colorspace; 1023965825b97a5809454f5810f7e603cbd02daa036scroggo#endif 1033965825b97a5809454f5810f7e603cbd02daa036scroggo 1043965825b97a5809454f5810f7e603cbd02daa036scroggo#ifdef PNG_iCCP_SUPPORTED 1053965825b97a5809454f5810f7e603cbd02daa036scroggo /* iCCP chunk data. */ 1063965825b97a5809454f5810f7e603cbd02daa036scroggo png_charp iccp_name; /* profile name */ 1073965825b97a5809454f5810f7e603cbd02daa036scroggo png_bytep iccp_profile; /* International Color Consortium profile data */ 1083965825b97a5809454f5810f7e603cbd02daa036scroggo png_uint_32 iccp_proflen; /* ICC profile data length */ 1093965825b97a5809454f5810f7e603cbd02daa036scroggo#endif 1103965825b97a5809454f5810f7e603cbd02daa036scroggo 1113965825b97a5809454f5810f7e603cbd02daa036scroggo#ifdef PNG_TEXT_SUPPORTED 1123965825b97a5809454f5810f7e603cbd02daa036scroggo /* The tEXt, and zTXt chunks contain human-readable textual data in 1133965825b97a5809454f5810f7e603cbd02daa036scroggo * uncompressed, compressed, and optionally compressed forms, respectively. 1143965825b97a5809454f5810f7e603cbd02daa036scroggo * The data in "text" is an array of pointers to uncompressed, 1153965825b97a5809454f5810f7e603cbd02daa036scroggo * null-terminated C strings. Each chunk has a keyword that describes the 1163965825b97a5809454f5810f7e603cbd02daa036scroggo * textual data contained in that chunk. Keywords are not required to be 1173965825b97a5809454f5810f7e603cbd02daa036scroggo * unique, and the text string may be empty. Any number of text chunks may 1183965825b97a5809454f5810f7e603cbd02daa036scroggo * be in an image. 1193965825b97a5809454f5810f7e603cbd02daa036scroggo */ 1203965825b97a5809454f5810f7e603cbd02daa036scroggo int num_text; /* number of comments read or comments to write */ 1213965825b97a5809454f5810f7e603cbd02daa036scroggo int max_text; /* current size of text array */ 1223965825b97a5809454f5810f7e603cbd02daa036scroggo png_textp text; /* array of comments read or comments to write */ 1233965825b97a5809454f5810f7e603cbd02daa036scroggo#endif /* TEXT */ 1243965825b97a5809454f5810f7e603cbd02daa036scroggo 1253965825b97a5809454f5810f7e603cbd02daa036scroggo#ifdef PNG_tIME_SUPPORTED 1263965825b97a5809454f5810f7e603cbd02daa036scroggo /* The tIME chunk holds the last time the displayed image data was 1273965825b97a5809454f5810f7e603cbd02daa036scroggo * modified. See the png_time struct for the contents of this struct. 1283965825b97a5809454f5810f7e603cbd02daa036scroggo */ 1293965825b97a5809454f5810f7e603cbd02daa036scroggo png_time mod_time; 1303965825b97a5809454f5810f7e603cbd02daa036scroggo#endif 1313965825b97a5809454f5810f7e603cbd02daa036scroggo 1323965825b97a5809454f5810f7e603cbd02daa036scroggo#ifdef PNG_sBIT_SUPPORTED 1333965825b97a5809454f5810f7e603cbd02daa036scroggo /* The sBIT chunk specifies the number of significant high-order bits 1343965825b97a5809454f5810f7e603cbd02daa036scroggo * in the pixel data. Values are in the range [1, bit_depth], and are 1353965825b97a5809454f5810f7e603cbd02daa036scroggo * only specified for the channels in the pixel data. The contents of 1363965825b97a5809454f5810f7e603cbd02daa036scroggo * the low-order bits is not specified. Data is valid if 1373965825b97a5809454f5810f7e603cbd02daa036scroggo * (valid & PNG_INFO_sBIT) is non-zero. 1383965825b97a5809454f5810f7e603cbd02daa036scroggo */ 1393965825b97a5809454f5810f7e603cbd02daa036scroggo png_color_8 sig_bit; /* significant bits in color channels */ 1403965825b97a5809454f5810f7e603cbd02daa036scroggo#endif 1413965825b97a5809454f5810f7e603cbd02daa036scroggo 1423965825b97a5809454f5810f7e603cbd02daa036scroggo#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \ 1433965825b97a5809454f5810f7e603cbd02daa036scroggodefined(PNG_READ_BACKGROUND_SUPPORTED) 1443965825b97a5809454f5810f7e603cbd02daa036scroggo /* The tRNS chunk supplies transparency data for paletted images and 1453965825b97a5809454f5810f7e603cbd02daa036scroggo * other image types that don't need a full alpha channel. There are 1463965825b97a5809454f5810f7e603cbd02daa036scroggo * "num_trans" transparency values for a paletted image, stored in the 1473965825b97a5809454f5810f7e603cbd02daa036scroggo * same order as the palette colors, starting from index 0. Values 1483965825b97a5809454f5810f7e603cbd02daa036scroggo * for the data are in the range [0, 255], ranging from fully transparent 1493965825b97a5809454f5810f7e603cbd02daa036scroggo * to fully opaque, respectively. For non-paletted images, there is a 1503965825b97a5809454f5810f7e603cbd02daa036scroggo * single color specified that should be treated as fully transparent. 1513965825b97a5809454f5810f7e603cbd02daa036scroggo * Data is valid if (valid & PNG_INFO_tRNS) is non-zero. 1523965825b97a5809454f5810f7e603cbd02daa036scroggo */ 1533965825b97a5809454f5810f7e603cbd02daa036scroggo png_bytep trans_alpha; /* alpha values for paletted image */ 1543965825b97a5809454f5810f7e603cbd02daa036scroggo png_color_16 trans_color; /* transparent color for non-palette image */ 1553965825b97a5809454f5810f7e603cbd02daa036scroggo#endif 1563965825b97a5809454f5810f7e603cbd02daa036scroggo 1573965825b97a5809454f5810f7e603cbd02daa036scroggo#if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1583965825b97a5809454f5810f7e603cbd02daa036scroggo /* The bKGD chunk gives the suggested image background color if the 1593965825b97a5809454f5810f7e603cbd02daa036scroggo * display program does not have its own background color and the image 1603965825b97a5809454f5810f7e603cbd02daa036scroggo * is needs to composited onto a background before display. The colors 1613965825b97a5809454f5810f7e603cbd02daa036scroggo * in "background" are normally in the same color space/depth as the 1623965825b97a5809454f5810f7e603cbd02daa036scroggo * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero. 1633965825b97a5809454f5810f7e603cbd02daa036scroggo */ 1643965825b97a5809454f5810f7e603cbd02daa036scroggo png_color_16 background; 1653965825b97a5809454f5810f7e603cbd02daa036scroggo#endif 1663965825b97a5809454f5810f7e603cbd02daa036scroggo 1673965825b97a5809454f5810f7e603cbd02daa036scroggo#ifdef PNG_oFFs_SUPPORTED 1683965825b97a5809454f5810f7e603cbd02daa036scroggo /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards 1693965825b97a5809454f5810f7e603cbd02daa036scroggo * and downwards from the top-left corner of the display, page, or other 1703965825b97a5809454f5810f7e603cbd02daa036scroggo * application-specific co-ordinate space. See the PNG_OFFSET_ defines 1713965825b97a5809454f5810f7e603cbd02daa036scroggo * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero. 1723965825b97a5809454f5810f7e603cbd02daa036scroggo */ 1733965825b97a5809454f5810f7e603cbd02daa036scroggo png_int_32 x_offset; /* x offset on page */ 1743965825b97a5809454f5810f7e603cbd02daa036scroggo png_int_32 y_offset; /* y offset on page */ 1753965825b97a5809454f5810f7e603cbd02daa036scroggo png_byte offset_unit_type; /* offset units type */ 1763965825b97a5809454f5810f7e603cbd02daa036scroggo#endif 1773965825b97a5809454f5810f7e603cbd02daa036scroggo 1783965825b97a5809454f5810f7e603cbd02daa036scroggo#ifdef PNG_pHYs_SUPPORTED 1793965825b97a5809454f5810f7e603cbd02daa036scroggo /* The pHYs chunk gives the physical pixel density of the image for 1803965825b97a5809454f5810f7e603cbd02daa036scroggo * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_ 1813965825b97a5809454f5810f7e603cbd02daa036scroggo * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero. 1823965825b97a5809454f5810f7e603cbd02daa036scroggo */ 1833965825b97a5809454f5810f7e603cbd02daa036scroggo png_uint_32 x_pixels_per_unit; /* horizontal pixel density */ 1843965825b97a5809454f5810f7e603cbd02daa036scroggo png_uint_32 y_pixels_per_unit; /* vertical pixel density */ 1853965825b97a5809454f5810f7e603cbd02daa036scroggo png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */ 1863965825b97a5809454f5810f7e603cbd02daa036scroggo#endif 1873965825b97a5809454f5810f7e603cbd02daa036scroggo 1883965825b97a5809454f5810f7e603cbd02daa036scroggo#ifdef PNG_hIST_SUPPORTED 1893965825b97a5809454f5810f7e603cbd02daa036scroggo /* The hIST chunk contains the relative frequency or importance of the 1903965825b97a5809454f5810f7e603cbd02daa036scroggo * various palette entries, so that a viewer can intelligently select a 1913965825b97a5809454f5810f7e603cbd02daa036scroggo * reduced-color palette, if required. Data is an array of "num_palette" 1923965825b97a5809454f5810f7e603cbd02daa036scroggo * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST) 1933965825b97a5809454f5810f7e603cbd02daa036scroggo * is non-zero. 1943965825b97a5809454f5810f7e603cbd02daa036scroggo */ 1953965825b97a5809454f5810f7e603cbd02daa036scroggo png_uint_16p hist; 1963965825b97a5809454f5810f7e603cbd02daa036scroggo#endif 1973965825b97a5809454f5810f7e603cbd02daa036scroggo 1983965825b97a5809454f5810f7e603cbd02daa036scroggo#ifdef PNG_pCAL_SUPPORTED 1993965825b97a5809454f5810f7e603cbd02daa036scroggo /* The pCAL chunk describes a transformation between the stored pixel 2003965825b97a5809454f5810f7e603cbd02daa036scroggo * values and original physical data values used to create the image. 2013965825b97a5809454f5810f7e603cbd02daa036scroggo * The integer range [0, 2^bit_depth - 1] maps to the floating-point 2023965825b97a5809454f5810f7e603cbd02daa036scroggo * range given by [pcal_X0, pcal_X1], and are further transformed by a 2033965825b97a5809454f5810f7e603cbd02daa036scroggo * (possibly non-linear) transformation function given by "pcal_type" 2043965825b97a5809454f5810f7e603cbd02daa036scroggo * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_ 2053965825b97a5809454f5810f7e603cbd02daa036scroggo * defines below, and the PNG-Group's PNG extensions document for a 2063965825b97a5809454f5810f7e603cbd02daa036scroggo * complete description of the transformations and how they should be 2073965825b97a5809454f5810f7e603cbd02daa036scroggo * implemented, and for a description of the ASCII parameter strings. 2083965825b97a5809454f5810f7e603cbd02daa036scroggo * Data values are valid if (valid & PNG_INFO_pCAL) non-zero. 2093965825b97a5809454f5810f7e603cbd02daa036scroggo */ 2103965825b97a5809454f5810f7e603cbd02daa036scroggo png_charp pcal_purpose; /* pCAL chunk description string */ 2113965825b97a5809454f5810f7e603cbd02daa036scroggo png_int_32 pcal_X0; /* minimum value */ 2123965825b97a5809454f5810f7e603cbd02daa036scroggo png_int_32 pcal_X1; /* maximum value */ 2133965825b97a5809454f5810f7e603cbd02daa036scroggo png_charp pcal_units; /* Latin-1 string giving physical units */ 2143965825b97a5809454f5810f7e603cbd02daa036scroggo png_charpp pcal_params; /* ASCII strings containing parameter values */ 2153965825b97a5809454f5810f7e603cbd02daa036scroggo png_byte pcal_type; /* equation type (see PNG_EQUATION_ below) */ 2163965825b97a5809454f5810f7e603cbd02daa036scroggo png_byte pcal_nparams; /* number of parameters given in pcal_params */ 2173965825b97a5809454f5810f7e603cbd02daa036scroggo#endif 2183965825b97a5809454f5810f7e603cbd02daa036scroggo 2193965825b97a5809454f5810f7e603cbd02daa036scroggo/* New members added in libpng-1.0.6 */ 2203965825b97a5809454f5810f7e603cbd02daa036scroggo png_uint_32 free_me; /* flags items libpng is responsible for freeing */ 2213965825b97a5809454f5810f7e603cbd02daa036scroggo 2223965825b97a5809454f5810f7e603cbd02daa036scroggo#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED 2233965825b97a5809454f5810f7e603cbd02daa036scroggo /* Storage for unknown chunks that the library doesn't recognize. */ 2243965825b97a5809454f5810f7e603cbd02daa036scroggo png_unknown_chunkp unknown_chunks; 2253965825b97a5809454f5810f7e603cbd02daa036scroggo 2263965825b97a5809454f5810f7e603cbd02daa036scroggo /* The type of this field is limited by the type of 2273965825b97a5809454f5810f7e603cbd02daa036scroggo * png_struct::user_chunk_cache_max, else overflow can occur. 2283965825b97a5809454f5810f7e603cbd02daa036scroggo */ 2293965825b97a5809454f5810f7e603cbd02daa036scroggo int unknown_chunks_num; 2303965825b97a5809454f5810f7e603cbd02daa036scroggo#endif 2313965825b97a5809454f5810f7e603cbd02daa036scroggo 2323965825b97a5809454f5810f7e603cbd02daa036scroggo#ifdef PNG_sPLT_SUPPORTED 2333965825b97a5809454f5810f7e603cbd02daa036scroggo /* Data on sPLT chunks (there may be more than one). */ 2343965825b97a5809454f5810f7e603cbd02daa036scroggo png_sPLT_tp splt_palettes; 2353965825b97a5809454f5810f7e603cbd02daa036scroggo int splt_palettes_num; /* Match type returned by png_get API */ 2363965825b97a5809454f5810f7e603cbd02daa036scroggo#endif 2373965825b97a5809454f5810f7e603cbd02daa036scroggo 2383965825b97a5809454f5810f7e603cbd02daa036scroggo#ifdef PNG_sCAL_SUPPORTED 2393965825b97a5809454f5810f7e603cbd02daa036scroggo /* The sCAL chunk describes the actual physical dimensions of the 2403965825b97a5809454f5810f7e603cbd02daa036scroggo * subject matter of the graphic. The chunk contains a unit specification 2413965825b97a5809454f5810f7e603cbd02daa036scroggo * a byte value, and two ASCII strings representing floating-point 2423965825b97a5809454f5810f7e603cbd02daa036scroggo * values. The values are width and height corresponsing to one pixel 2433965825b97a5809454f5810f7e603cbd02daa036scroggo * in the image. Data values are valid if (valid & PNG_INFO_sCAL) is 2443965825b97a5809454f5810f7e603cbd02daa036scroggo * non-zero. 2453965825b97a5809454f5810f7e603cbd02daa036scroggo */ 2463965825b97a5809454f5810f7e603cbd02daa036scroggo png_byte scal_unit; /* unit of physical scale */ 2473965825b97a5809454f5810f7e603cbd02daa036scroggo png_charp scal_s_width; /* string containing height */ 2483965825b97a5809454f5810f7e603cbd02daa036scroggo png_charp scal_s_height; /* string containing width */ 2493965825b97a5809454f5810f7e603cbd02daa036scroggo#endif 2503965825b97a5809454f5810f7e603cbd02daa036scroggo 2513965825b97a5809454f5810f7e603cbd02daa036scroggo#ifdef PNG_INFO_IMAGE_SUPPORTED 2523965825b97a5809454f5810f7e603cbd02daa036scroggo /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) 2533965825b97a5809454f5810f7e603cbd02daa036scroggo non-zero */ 2543965825b97a5809454f5810f7e603cbd02daa036scroggo /* Data valid if (valid & PNG_INFO_IDAT) non-zero */ 2553965825b97a5809454f5810f7e603cbd02daa036scroggo png_bytepp row_pointers; /* the image bits */ 2563965825b97a5809454f5810f7e603cbd02daa036scroggo#endif 2573965825b97a5809454f5810f7e603cbd02daa036scroggo 2583965825b97a5809454f5810f7e603cbd02daa036scroggo}; 2593965825b97a5809454f5810f7e603cbd02daa036scroggo#endif /* PNGINFO_H */ 260