www.pudn.com > RSImageManger.rar > BMPDEC.H

/* 
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|      $id$ 
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|      Copyright (c) 1996-1998 Ulrich von Zadow 
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*/ 
 
#ifndef INCL_BMPDEC 
#define INCL_BMPDEC 
 
#ifndef INCL_PICDEC 
#include "picdec.h" 
#endif 
 
#ifndef INCL_WINDEFS 
#include "windefs.h" 
#endif 
 
//! Windows bitmap file decoder. Decodes bitmap files (compressed and 
//! uncompressed) of all bit depths. Returns an 8 
//! or 32 bpp bitmap. 
class CBmpDecoder : public CPicDecoder 
{ 
 
public: 
  //! Creates a decoder 
  CBmpDecoder 
    (); 
 
  //! Destroys a decoder 
  virtual ~CBmpDecoder 
    (); 
 
protected: 
  //! Does the actual decoding of bitmap data. 
  virtual void DoDecode 
    ( CBmp * pBmp, 
      RGBAPIXEL ** ppPal, 
      int * pDestBPP, 
      CDataSource * pDataSrc 
    ); 
 
private: 
 
  // Decodes the bitmap file & info headers 
  WINBITMAPINFOHEADER * getInfoHeader 
    ( CDataSource * pDataSrc, 
      RGBAPIXEL ** ppPal 
    ); 
 
  // Decodes a 2-color bitmap. Ignores the palette & just uses 
  // black & white as 'colors' 
  void decode1bpp 
    ( CDataSource * pDataSrc, 
      CBmp * pBmp, 
      int DestBPP 
    ); 
 
  // Decodes an uncompressed 16-color-bitmap. 
  void decode4bpp 
    ( CDataSource * pDataSrc, 
      CBmp * pBmp, 
      RGBAPIXEL * pPal, 
      int DestBPP 
    ); 
 
  // Decodes an uncompressed 256-color-bitmap. 
  void decode8bpp 
    ( CDataSource * pDataSrc, 
      CBmp * pBmp, 
      RGBAPIXEL * pPal, 
      int DestBPP 
    ); 
 
  // Decodes a compressed 16-color-bitmap. 
  void decodeRLE4 
    ( CDataSource * pDataSrc, 
      CBmp * pBmp, 
      RGBAPIXEL * pPal, 
      int DestBPP 
    ); 
 
  // Decodes a compressed 256-color-bitmap. 
  void decodeRLE8 
    ( CDataSource * pDataSrc, 
      CBmp * pBmp, 
      RGBAPIXEL * pPal, 
      int DestBPP 
    ); 
 
  // Decodes true-color bitmap 
  void decode24bpp 
    ( CDataSource * pDataSrc, 
      CBmp * pBmp 
    ); 
 
  // Decodes true-color bitmap 
  void CBmpDecoder::decode32bpp 
    ( CDataSource * pDataSrc, 
      CBmp * pBmp 
    ); 
 
  // Decodes two 4-bit pixels using a palette & puts them in pDest 
  // and pDest+4. 
  void decode2Nibbles 
    ( BYTE * pDest, 
      BYTE SrcByte, 
      RGBAPIXEL * pPal, 
      int DestBPP 
    ); 
 
  // Makes a private copy of the palette in the file and sets the 
  // alpha channel. Returns the size of the palette in bytes. 
  int readPalette 
    ( WINBITMAPINFOHEADER * pBMI,     // Pointer to bitmapinfoheader in file. 
      CDataSource * pDataSrc, 
      RGBAPIXEL ** ppPal 
    ); 
 
}; 
 
#endif 
/* 
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|      $log$ 
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*/