include/wx/quantize.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        quantize.h
   3 // Purpose:     wxQuantizer class
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     22/6/2000
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 /*
  13  * From jquant2.c
  14  *
  15  * Copyright (C) 1991-1996, Thomas G. Lane.
  16  * This file is part of the Independent JPEG Group's software.
  17  * For conditions of distribution and use, see the accompanying README file.
  18  */
  19
  20 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  21 #pragma interface "quantize.h"
  22 #endif
  23
  24 #ifndef _WX_QUANTIZE_H_
  25 #define _WX_QUANTIZE_H_
  26
  27 class WXDLLEXPORT wxImage;
  28
  29 /*
  30  * wxQuantize
  31  * Based on the JPEG quantization code. Reduces the number of colours in a wxImage.
  32  */
  33
  34 #define wxQUANTIZE_INCLUDE_WINDOWS_COLOURS      0x01
  35 #define wxQUANTIZE_RETURN_8BIT_DATA             0x02
  36 #define wxQUANTIZE_FILL_DESTINATION_IMAGE       0x04
  37
  38 class WXDLLEXPORT wxQuantize: public wxObject
  39 {
  40 public:
  41 DECLARE_DYNAMIC_CLASS(wxQuantize)
  42
  43 //// Constructor
  44
  45     wxQuantize() {}
  46     ~wxQuantize() {}
  47
  48 //// Operations
  49
  50     // Reduce the colours in the source image and put the result into the
  51     // destination image. Both images may be the same, to overwrite the source image.
  52     // Specify an optional palette pointer to receive the resulting palette.
  53     // This palette may be passed to ConvertImageToBitmap, for example.
  54     // If you pass a palette pointer, you must free the palette yourself.
  55
  56     static bool Quantize(const wxImage& src, wxImage& dest, wxPalette** pPalette, int desiredNoColours = 236,
  57         unsigned char** eightBitData = 0, int flags = wxQUANTIZE_INCLUDE_WINDOWS_COLOURS|wxQUANTIZE_FILL_DESTINATION_IMAGE|wxQUANTIZE_RETURN_8BIT_DATA);
  58
  59     // This version sets a palette in the destination image so you don't
  60     // have to manage it yourself.
  61
  62     static bool Quantize(const wxImage& src, wxImage& dest, int desiredNoColours = 236,
  63         unsigned char** eightBitData = 0, int flags = wxQUANTIZE_INCLUDE_WINDOWS_COLOURS|wxQUANTIZE_FILL_DESTINATION_IMAGE|wxQUANTIZE_RETURN_8BIT_DATA);
  64
  65 //// Helpers
  66
  67     // Converts input bitmap(s) into 8bit representation with custom palette
  68
  69     // in_rows and out_rows are arrays [0..h-1] of pointer to rows
  70     // (in_rows contains w * 3 bytes per row, out_rows w bytes per row)
  71     // fills out_rows with indexes into palette (which is also stored into palette variable)
  72     static void DoQuantize(unsigned w, unsigned h, unsigned char **in_rows, unsigned char **out_rows, unsigned char *palette, int desiredNoColours);
  73
  74 };
  75
  76 #endif
  77     // _WX_QUANTIZE_H_
  78