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Imported from libpng-0.99.tar

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This commit is contained in:
Glenn Randers-Pehrson
1998-01-30 21:45:12 -06:00
parent c4a2ae6cac
commit 46f61e2398
25 changed files with 856 additions and 187 deletions
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152
png.h
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@@ -1,12 +1,12 @@
/* png.h - header file for PNG reference library
*
* libpng 0.98 beta
* libpng 0.99 beta
* 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
* Copyright (c) 1998 Glenn Randers-Pehrson
* January 16, 1998
* January 30, 1998
*
* Note about libpng version numbers:
*
@@ -119,30 +119,30 @@ extern "C" {
*/
/* Version information for png.h - this should match the version in png.c */
#define PNG_LIBPNG_VER_STRING "0.98"
#define PNG_LIBPNG_VER_STRING "0.99"
/* 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 98
#define PNG_LIBPNG_VER 99
/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
#ifndef PNG_NO_EXTERN
#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
/* Version information for C files, stored in png.c. This had better match
* the version above.
*/
extern char png_libpng_ver[];
extern char png_libpng_ver[5];
/* 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[];
extern int FARDATA png_pass_start[7];
extern int FARDATA png_pass_inc[7];
extern int FARDATA png_pass_ystart[7];
extern int FARDATA png_pass_yinc[7];
extern int FARDATA png_pass_mask[7];
extern int FARDATA png_pass_dsp_mask[7];
/* 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[];
extern int FARDATA png_pass_width[7];
extern int FARDATA png_pass_height[7];
*/
#endif /* PNG_NO_EXTERN */
@@ -268,7 +268,8 @@ typedef struct png_info_struct
* and initialize the appropriate fields below.
*/
#if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED)
#if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED) || \
defined(PNG_READ_GAMMA_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.
@@ -323,7 +324,8 @@ typedef struct png_info_struct
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)
#if defined(PNG_READ_bKGD_SUPPORTED) || defined(PNG_WRITE_bKGD_SUPPORTED) || \
defined(PNG_READ_BACKGROUND_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
@@ -444,6 +446,15 @@ typedef png_info FAR * FAR * png_infopp;
#define PNG_RESOLUTION_METER 1 /* pixels/meter */
#define PNG_RESOLUTION_LAST 2 /* Not a valid value */
/* These are for the sRGB chunk. These values should NOT be changed. */
#define PNG_sRGB_INTENT_SATURATION 0
#define PNG_sRGB_INTENT_PERCEPTUAL 1
#define PNG_sRGB_INTENT_ABSOLUTE 2
#define PNG_sRGB_INTENT_RELATIVE 3
#define PNG_sRGB_INTENT_LAST 4 /* 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
@@ -636,8 +647,10 @@ struct png_struct_def
#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_READ_DITHER_SUPPORTED) || defined(PNG_READ_hIST_SUPPORTED)
png_uint_16p hist; /* histogram */
#endif
#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 */
@@ -1091,6 +1104,13 @@ extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,
/* frees a pointer allocated by png_malloc() */
extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
#ifdef PNGTEST_MEMORY_DEBUG
/* debugging versions of png_malloc() and png_free() */
extern PNG_EXPORT(png_voidp,png_debug_malloc) PNGARG((png_structp png_ptr,
png_uint_32 size));
extern PNG_EXPORT(void,png_debug_free) PNGARG((png_structp png_ptr,
png_voidp ptr));
#endif
#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 */
@@ -1123,18 +1143,67 @@ extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr,
* 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 */
/* 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 */
/* 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 */
/* Returns number of color channels in image. */
extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr,
png_infop info_ptr));
#ifdef PNG_EASY_ACCESS_SUPPORTED
/* Returns image width in pixels. */
extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp
png_ptr, png_infop info_ptr));
/* Returns image height in pixels. */
extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp
png_ptr, png_infop info_ptr));
/* Returns image bit_depth. */
extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp
png_ptr, png_infop info_ptr));
/* Returns image color_type. */
extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp
png_ptr, png_infop info_ptr));
/* Returns image filter_type. */
extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp
png_ptr, png_infop info_ptr));
/* Returns image interlace_type. */
extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp
png_ptr, png_infop info_ptr));
/* Returns image compression_type. */
extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp
png_ptr, png_infop info_ptr));
/* Returns image resolution in pixels per meter, from pHYs chunk data. */
extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp
png_ptr, png_infop info_ptr));
/* Returns pixel aspect ratio, computed from pHYs chunk data. */
extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp
png_ptr, png_infop info_ptr));
/* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
extern PNG_EXPORT(png_uint_32, png_get_x_offset_pixels) PNGARG((png_structp
png_ptr, png_infop info_ptr));
extern PNG_EXPORT(png_uint_32, png_get_y_offset_pixels) PNGARG((png_structp
png_ptr, png_infop info_ptr));
extern PNG_EXPORT(png_uint_32, png_get_x_offset_microns) PNGARG((png_structp
png_ptr, png_infop info_ptr));
extern PNG_EXPORT(png_uint_32, png_get_y_offset_microns) PNGARG((png_structp
png_ptr, png_infop info_ptr));
#endif /* PNG_EASY_ACCESS_SUPPORTED */
/* 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));
@@ -1294,6 +1363,9 @@ extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
* libpng yet, but more support will be added as needed.
*/
#if (PNG_DEBUG > 0)
#ifdef PNG_NO_STDIO
#include <stdio.h>
#endif
#ifndef PNG_DEBUG_FILE
#define PNG_DEBUG_FILE stderr
#endif /* PNG_DEBUG_FILE */
@@ -1411,31 +1483,31 @@ extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
/* 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[];
/* place to hold the signature string for a PNG file. */
extern png_byte FARDATA png_sig[8];
/* 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_sRGB[];
extern png_byte FARDATA png_tEXt[];
extern png_byte FARDATA png_tIME[];
extern png_byte FARDATA png_tRNS[];
extern png_byte FARDATA png_zTXt[];
extern png_byte FARDATA png_IHDR[5];
extern png_byte FARDATA png_IDAT[5];
extern png_byte FARDATA png_IEND[5];
extern png_byte FARDATA png_PLTE[5];
extern png_byte FARDATA png_bKGD[5];
extern png_byte FARDATA png_cHRM[5];
extern png_byte FARDATA png_gAMA[5];
extern png_byte FARDATA png_hIST[5];
extern png_byte FARDATA png_oFFs[5];
extern png_byte FARDATA png_pCAL[5];
extern png_byte FARDATA png_pHYs[5];
extern png_byte FARDATA png_sBIT[5];
extern png_byte FARDATA png_sRGB[5];
extern png_byte FARDATA png_tEXt[5];
extern png_byte FARDATA png_tIME[5];
extern png_byte FARDATA png_tRNS[5];
extern png_byte FARDATA png_zTXt[5];
#endif /* PNG_NO_EXTERN */
@@ -1550,7 +1622,7 @@ PNG_EXTERN void png_write_chunk_data PNGARG((png_structp png_ptr,
/* 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 */
/* simple function to write the signature */
PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr));
/* write various chunks */