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170 lines
3.4 KiB
C
170 lines
3.4 KiB
C
/*
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* pnglite.h - Interface for pnglite library
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* Copyright (c) 2007 Daniel Karling
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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*
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* 2. Altered source versions must be plainly marked as such, and must not
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* be misrepresented as being the original software.
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*
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* 3. This notice may not be removed or altered from any source
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* distribution.
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*
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* Daniel Karling
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* daniel.karling@gmail.com
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*/
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#ifndef _PNGLITE_H_
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#define _PNGLITE_H_
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#include <string.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* Enumerations for pnglite.
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* Negative numbers are error codes and 0 and up are okay responses.
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*/
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enum {
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PNG_DONE = 1,
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PNG_NO_ERROR = 0,
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PNG_FILE_ERROR = -1,
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PNG_HEADER_ERROR = -2,
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PNG_IO_ERROR = -3,
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PNG_EOF_ERROR = -4,
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PNG_CRC_ERROR = -5,
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PNG_MEMORY_ERROR = -6,
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PNG_ZLIB_ERROR = -7,
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PNG_UNKNOWN_FILTER = -8,
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PNG_NOT_SUPPORTED = -9,
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PNG_WRONG_ARGUMENTS = -10
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};
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/*
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* The five different kinds of color storage in PNG files.
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*/
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enum {
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PNG_GREYSCALE = 0,
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PNG_TRUECOLOR = 2,
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PNG_INDEXED = 3,
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PNG_GREYSCALE_ALPHA = 4,
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PNG_TRUECOLOR_ALPHA = 6
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};
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typedef struct {
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void *zs; /* pointer to z_stream */
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int fd;
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unsigned char *image;
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unsigned char *png_data;
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unsigned png_datalen;
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unsigned width;
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unsigned height;
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unsigned char depth;
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unsigned char color_type;
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unsigned char compression_method;
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unsigned char filter_method;
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unsigned char interlace_method;
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unsigned char bpp;
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unsigned char *readbuf;
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unsigned readbuflen;
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} png_t;
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/*
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* Function: png_open
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*
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* This function is used to open a png file with the internal file
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* IO system.
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*
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* Parameters:
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* png - Empty png_t struct.
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* filename - Filename of the file to be opened.
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*
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* Returns:
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* PNG_NO_ERROR on success, otherwise an error code.
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*/
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int png_open(png_t *png, const char *filename);
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/*
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* Function: png_print_info
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*
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* This function prints some info about the opened png file to stdout.
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*
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* Parameters:
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* png - png struct to get info from.
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*/
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void png_print_info(png_t *png);
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/*
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* Function: png_error_string
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*
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* This function translates an error code to a human readable string.
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*
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* Parameters:
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* error - Error code.
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*
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* Returns:
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* Pointer to string.
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*/
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char *png_error_string(int error);
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/*
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* Function: png_get_data
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*
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* This function decodes the opened png file and stores the result in data.
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* data should be big enough to hold the decoded png.
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* Required size will be:
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*
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* > width*height*(bytes per pixel)
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*
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* Parameters:
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* data - Where to store result.
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*
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* Returns:
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* PNG_NO_ERROR on success, otherwise an error code.
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*/
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int png_get_data(png_t *png, uint8_t *data);
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/*
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* Function: png_close
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*
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* Closes an open png file pointer.
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*
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* Parameters:
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* png - png to close.
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*
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* Returns:
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* PNG_NO_ERROR
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*/
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int png_close(png_t *png);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _PNGLITE_H_ */
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