include/wx/quantize.h

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