include/wx/iffdecod.h

   1 //
   2 // iffdecod.h   - image handler for IFF/ILBM images
   3 //
   4 // (c) Steffen Gutmann, 2002
   5 //
   6 // Creation date: 08.01.2002
   7 // Last modified: 12.01.2002
   8 //
   9
  10 #ifndef WX_IIF_DECODE_H
  11 #define WX_IIF_DECODE_H
  12
  13 #ifdef __GNUG__
  14 #pragma interface "iffdecod.h"
  15 #endif
  16
  17 #include "wx/setup.h"
  18 #define wxUSE_IFF 1
  19
  20 #if wxUSE_STREAMS && wxUSE_IFF
  21
  22 #include "wx/stream.h"
  23 #include "wx/image.h"
  24
  25 // --------------------------------------------------------------------------
  26 // Constants
  27 // --------------------------------------------------------------------------
  28
  29 // Error codes:
  30 //  Note that the error code wxIFF_TRUNCATED means that the image itself
  31 //  is most probably OK, but the decoder didn't reach the end of the data
  32 //  stream; this means that if it was not reading directly from file,
  33 //  the stream will not be correctly positioned.
  34 //
  35
  36 enum
  37 {
  38     wxIFF_OK = 0,                   /* everything was OK */
  39     wxIFF_INVFORMAT,                /* error in iff header */
  40     wxIFF_MEMERR,                   /* error allocating memory */
  41     wxIFF_TRUNCATED                 /* file appears to be truncated */
  42 };
  43
  44 // --------------------------------------------------------------------------
  45 // wxIFFDecoder class
  46 // --------------------------------------------------------------------------
  47
  48 // internal class for storing IFF image data
  49 class IFFImage
  50 {
  51 public:
  52     unsigned int w;                 /* width */
  53     unsigned int h;                 /* height */
  54     int transparent;                /* transparent color (-1 = none) */
  55     int colors;                     /* number of colors */
  56     unsigned char *p;               /* bitmap */
  57     unsigned char *pal;             /* palette */
  58
  59     IFFImage() : w(0), h(0), colors(0), p(0), pal(0) {}
  60     ~IFFImage() { delete [] p; delete [] pal; }
  61 };
  62
  63 class WXDLLEXPORT wxIFFDecoder
  64 {
  65 private:
  66     IFFImage *m_image;          // image data
  67     wxInputStream *m_f;         // input stream
  68     unsigned char *databuf;
  69     unsigned char *picptr;
  70     unsigned char *decomp_mem;
  71
  72     void Destroy();
  73
  74 public:
  75     // get data of current frame
  76     unsigned char* GetData() const;
  77     unsigned char* GetPalette() const;
  78     int GetNumColors() const;
  79     unsigned int GetWidth() const;
  80     unsigned int GetHeight() const;
  81     int GetTransparentColour() const;
  82
  83     // constructor, destructor, etc.
  84     wxIFFDecoder(wxInputStream *s);
  85     ~wxIFFDecoder() { Destroy(); }
  86     bool CanRead();
  87     int ReadIFF();
  88     bool ConvertToImage(wxImage *image) const;
  89 };
  90
  91
  92 #endif  // wxUSE_STREAM && wxUSE_IFF
  93 #endif  // _WX_IFFDECOD_H
  94