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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 
52 class GrFmtPngReader : public GrFmtReader
53 {
54 public:
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 
64 protected:
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 
74 class GrFmtPngWriter : public GrFmtWriter
75 {
76 public:
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 );
84 protected:
85 };
86 
87 
88 // PNG filter factory
89 class GrFmtPng : public GrFmtFilterFactory
90 {
91 public:
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