src/palmos/dib.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/palmos/dib.cpp
   3 // Purpose:     implements wxDIB class
   4 // Author:      William Osborne - minimal working wxPalmOS port
   5 // Modified by:
   6 // Created:     10.13.04
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) William Osborne
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 // For compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 #if wxUSE_WXDIB
  28
  29 #ifndef WX_PRECOMP
  30     #include "wx/string.h"
  31     #include "wx/log.h"
  32     #include "wx/intl.h"
  33     #include "wx/bitmap.h"
  34     #include "wx/image.h"
  35 #endif //WX_PRECOMP
  36
  37 #include "wx/file.h"
  38
  39 #include "wx/palmos/dib.h"
  40
  41 // ----------------------------------------------------------------------------
  42 // private functions
  43 // ----------------------------------------------------------------------------
  44
  45 // calculate the number of palette entries needed for the bitmap with this
  46 // number of bits per pixel
  47 static inline WORD GetNumberOfColours(WORD bitsPerPixel)
  48 {
  49     // only 1, 4 and 8bpp bitmaps use palettes (well, they could be used with
  50     // 24bpp ones too but we don't support this as I think it's quite uncommon)
  51     return bitsPerPixel <= 8 ? 1 << bitsPerPixel : 0;
  52 }
  53
  54 // wrapper around ::GetObject() for DIB sections
  55 static inline bool GetDIBSection(HBITMAP hbmp, DIBSECTION *ds)
  56 {
  57     // note that at least under Win9x (this doesn't seem to happen under Win2K
  58     // but this doesn't mean anything, of course), GetObject() may return
  59     // sizeof(DIBSECTION) for a bitmap which is *not* a DIB section and the way
  60     // to check for it is by looking at the bits pointer
  61     return ::GetObject(hbmp, sizeof(DIBSECTION), ds) == sizeof(DIBSECTION) &&
  62                 ds->dsBm.bmBits;
  63 }
  64
  65 // ============================================================================
  66 // implementation
  67 // ============================================================================
  68
  69 // ----------------------------------------------------------------------------
  70 // wxDIB creation
  71 // ----------------------------------------------------------------------------
  72
  73 bool wxDIB::Create(int width, int height, int depth)
  74 {
  75     return false;
  76 }
  77
  78 bool wxDIB::Create(const wxBitmap& bmp)
  79 {
  80     return false;
  81 }
  82
  83 bool wxDIB::CopyFromDDB(HBITMAP hbmp)
  84 {
  85     return false;
  86 }
  87
  88
  89 // ----------------------------------------------------------------------------
  90 // Loading/saving the DIBs
  91 // ----------------------------------------------------------------------------
  92
  93 bool wxDIB::Load(const wxString& filename)
  94 {
  95     return false;
  96 }
  97
  98 bool wxDIB::Save(const wxString& filename)
  99 {
 100     return false;
 101 }
 102
 103 // ----------------------------------------------------------------------------
 104 // wxDIB accessors
 105 // ----------------------------------------------------------------------------
 106
 107 void wxDIB::DoGetObject() const
 108 {
 109 }
 110
 111 // ----------------------------------------------------------------------------
 112 // DDB <-> DIB conversions
 113 // ----------------------------------------------------------------------------
 114
 115 HBITMAP wxDIB::CreateDDB(HDC hdc) const
 116 {
 117     return 0;
 118 }
 119
 120 /* static */
 121 HBITMAP wxDIB::ConvertToBitmap(const BITMAPINFO *pbmi, HDC hdc, void *bits)
 122 {
 123     return 0;
 124 }
 125
 126 /* static */
 127 size_t wxDIB::ConvertFromBitmap(BITMAPINFO *pbi, HBITMAP hbmp)
 128 {
 129     return 0;
 130 }
 131
 132 /* static */
 133 HGLOBAL wxDIB::ConvertFromBitmap(HBITMAP hbmp)
 134 {
 135     return NULL;
 136 }
 137
 138 // ----------------------------------------------------------------------------
 139 // palette support
 140 // ----------------------------------------------------------------------------
 141
 142 #if wxUSE_PALETTE
 143
 144 wxPalette *wxDIB::CreatePalette() const
 145 {
 146     return NULL;
 147 }
 148
 149 #endif // wxUSE_PALETTE
 150
 151 // ----------------------------------------------------------------------------
 152 // wxImage support
 153 // ----------------------------------------------------------------------------
 154
 155 #if wxUSE_IMAGE
 156
 157 bool wxDIB::Create(const wxImage& image)
 158 {
 159     return false;
 160 }
 161
 162 wxImage wxDIB::ConvertToImage() const
 163 {
 164     return wxNullImage;
 165 }
 166
 167 #endif // wxUSE_IMAGE
 168
 169 #endif // wxUSE_WXDIB