1/*M///////////////////////////////////////////////////////////////////////////////////////
2//
3//  IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
4//
5//  By downloading, copying, installing or using the software you agree to this license.
6//  If you do not agree to this license, do not download, install,
7//  copy or use the software.
8//
9//
10//                        Intel License Agreement
11//                For Open Source Computer Vision Library
12//
13// Copyright (C) 2000, Intel Corporation, all rights reserved.
14// Third party copyrights are property of their respective owners.
15//
16// Redistribution and use in source and binary forms, with or without modification,
17// are permitted provided that the following conditions are met:
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23//     this list of conditions and the following disclaimer in the documentation
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27//     derived from this software without specific prior written permission.
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40//M*/
41
42#ifndef _GRFMT_PNG_H_
43#define _GRFMT_PNG_H_
44
45#ifdef HAVE_PNG
46
47#include "grfmt_base.h"
48#include "bitstrm.h"
49
50/* libpng version only */
51
52class GrFmtPngReader : public GrFmtReader
53{
54public:
55
56    GrFmtPngReader( const char* filename );
57    ~GrFmtPngReader();
58
59    bool  CheckFormat( const char* signature );
60    bool  ReadData( uchar* data, int step, int color );
61    bool  ReadHeader();
62    void  Close();
63
64protected:
65
66    void* m_png_ptr;  // pointer to decompression structure
67    void* m_info_ptr; // pointer to image information structure
68    void* m_end_info; // pointer to one more image information structure
69    FILE* m_f;
70    int   m_color_type;
71};
72
73
74class GrFmtPngWriter : public GrFmtWriter
75{
76public:
77
78    GrFmtPngWriter( const char* filename );
79    ~GrFmtPngWriter();
80
81    bool  IsFormatSupported( int depth );
82    bool  WriteImage( const uchar* data, int step,
83                      int width, int height, int depth, int channels );
84protected:
85};
86
87
88// PNG filter factory
89class GrFmtPng : public GrFmtFilterFactory
90{
91public:
92
93    GrFmtPng();
94    ~GrFmtPng();
95
96    GrFmtReader* NewReader( const char* filename );
97    GrFmtWriter* NewWriter( const char* filename );
98    bool CheckSignature( const char* signature );
99};
100
101#endif
102
103#endif/*_GRFMT_PNG_H_*/
104