src/msw/palette.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        palette.cpp
   3 // Purpose:     wxPalette
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart and Markus Holzem
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13 #pragma implementation "palette.h"
  14 #endif
  15
  16 // For compilers that support precompilation, includes "wx.h".
  17 #include "wx/wxprec.h"
  18
  19 #ifdef __BORLANDC__
  20 #pragma hdrstop
  21 #endif
  22
  23 #ifndef WX_PRECOMP
  24 #include <stdio.h>
  25 #include "wx/setup.h"
  26 #include "wx/palette.h"
  27 #endif
  28
  29 #include <windows.h>
  30
  31 #include "assert.h"
  32
  33 #if !USE_SHARED_LIBRARIES
  34 IMPLEMENT_DYNAMIC_CLASS(wxPalette, wxGDIObject)
  35 #endif
  36
  37 /*
  38  * Palette
  39  *
  40  */
  41
  42 wxPaletteRefData::wxPaletteRefData(void)
  43 {
  44   m_hPalette = 0;
  45 }
  46
  47 wxPaletteRefData::~wxPaletteRefData(void)
  48 {
  49         if ( m_hPalette )
  50                 ::DeleteObject((HPALETTE) m_hPalette);
  51 }
  52
  53 wxPalette::wxPalette(void)
  54 {
  55 }
  56
  57 wxPalette::wxPalette(const int n, const unsigned char *red, const unsigned char *green, const unsigned char *blue)
  58 {
  59   Create(n, red, green, blue);
  60 }
  61
  62 wxPalette::~wxPalette(void)
  63 {
  64 //      FreeResource(TRUE);
  65 }
  66
  67 bool wxPalette::FreeResource(bool force)
  68 {
  69         if ( M_PALETTEDATA && M_PALETTEDATA->m_hPalette)
  70         {
  71       DeleteObject((HPALETTE)M_PALETTEDATA->m_hPalette);
  72         }
  73         return TRUE;
  74 }
  75
  76 bool wxPalette::Create(const int n, const unsigned char *red, const unsigned char *green, const unsigned char *blue)
  77 {
  78   UnRef();
  79
  80   m_refData = new wxPaletteRefData;
  81
  82   NPLOGPALETTE npPal = (NPLOGPALETTE)LocalAlloc(LMEM_FIXED, sizeof(LOGPALETTE) +
  83                         (WORD)n * sizeof(PALETTEENTRY));
  84   if (!npPal)
  85     return(FALSE);
  86
  87   npPal->palVersion = 0x300;
  88   npPal->palNumEntries = n;
  89
  90   int i;
  91   for (i = 0; i < n; i ++)
  92   {
  93     npPal->palPalEntry[i].peRed = red[i];
  94     npPal->palPalEntry[i].peGreen = green[i];
  95     npPal->palPalEntry[i].peBlue = blue[i];
  96     npPal->palPalEntry[i].peFlags = 0;
  97   }
  98   M_PALETTEDATA->m_hPalette = (WXHPALETTE) CreatePalette((LPLOGPALETTE)npPal);
  99   LocalFree((HANDLE)npPal);
 100   return TRUE;
 101 }
 102
 103 int wxPalette::GetPixel(const unsigned char red, const unsigned char green, const unsigned char blue) const
 104 {
 105   if ( !m_refData )
 106         return FALSE;
 107
 108   return ::GetNearestPaletteIndex((HPALETTE) M_PALETTEDATA->m_hPalette, PALETTERGB(red, green, blue));
 109 }
 110
 111 bool wxPalette::GetRGB(const int index, unsigned char *red, unsigned char *green, unsigned char *blue) const
 112 {
 113   if ( !m_refData )
 114         return FALSE;
 115
 116   if (index < 0 || index > 255)
 117          return FALSE;
 118
 119   PALETTEENTRY entry;
 120   if (::GetPaletteEntries((HPALETTE) M_PALETTEDATA->m_hPalette, index, 1, &entry))
 121   {
 122          *red = entry.peRed;
 123          *green = entry.peGreen;
 124          *blue = entry.peBlue;
 125          return TRUE;
 126   } else
 127          return FALSE;
 128 }
 129
 130 void wxPalette::SetHPALETTE(WXHPALETTE pal)
 131 {
 132         if ( !m_refData )
 133                 m_refData = new wxPaletteRefData;
 134
 135     M_PALETTEDATA->m_hPalette = pal;
 136 }
 137