+ return TRUE;
+}
+
+wxImage wxBitmap::ConvertToImage() const
+{
+ // Initial attempt at a simple-minded implementation.
+ // The bitmap will always be created at the screen depth,
+ // so the 'depth' argument is ignored.
+ // TODO: transparency (create a mask image)
+
+ if (!Ok())
+ {
+ wxFAIL_MSG( wxT("bitmap is invalid") );
+ return wxNullImage;
+ }
+
+ wxImage image;
+
+ wxCHECK_MSG( Ok(), wxNullImage, wxT("invalid bitmap") );
+
+ // create an wxImage object
+ int width = GetWidth();
+ int height = GetHeight();
+ image.Create( width, height );
+ unsigned char *data = image.GetData();
+ if( !data )
+ {
+ wxFAIL_MSG( wxT("could not allocate data for image") );
+ return wxNullImage;
+ }
+
+ HDC hScreenDC = ::GetDC(NULL);
+
+ HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
+ ::ReleaseDC(NULL, hScreenDC);
+
+ HBITMAP hBitmap = (HBITMAP) GetHBITMAP();
+
+ HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
+
+ int i, j;
+ for (i = 0; i < GetWidth(); i++)
+ {
+ for (j = 0; j < GetHeight(); j++)
+ {
+ COLORREF color = ::GetPixel(hMemDC, i, j);
+ unsigned char red = GetRValue(color);
+ unsigned char green = GetGValue(color);
+ unsigned char blue = GetBValue(color);
+
+ image.SetRGB(i, j, red, green, blue);
+ }
+ }
+
+ ::SelectObject(hMemDC, hOldBitmap);
+ ::DeleteDC(hMemDC);
+
+#if wxUSE_PALETTE
+ // Copy the palette from the source image
+ if (GetPalette())
+ image.SetPalette(* GetPalette());
+#endif // wxUSE_PALETTE
+
+ return image;
+}
+
+#endif // __WXMICROWIN__
+
+// ----------------------------------------------------------------------------
+// wxImage to/from conversions
+// ----------------------------------------------------------------------------
+
+bool wxBitmap::CreateFromImage( const wxImage& image, int depth )
+{
+ wxCHECK_MSG( image.Ok(), FALSE, wxT("invalid image") );
+
+ UnRef();
+
+ // first convert the image to DIB
+ const int h = image.GetHeight();
+ const int w = image.GetWidth();
+
+ wxDIB dib(image);
+ if ( !dib.IsOk() )
+ return FALSE;
+
+
+ // store the bitmap parameters
+ wxBitmapRefData *refData = new wxBitmapRefData;
+ refData->m_width = w;
+ refData->m_height = h;
+ refData->m_depth = dib.GetDepth();
+ refData->m_hasAlpha = image.HasAlpha();
+
+ m_refData = refData;
+
+
+ // next either store DIB as is or create a DDB from it
+ HBITMAP hbitmap;
+
+ // TODO: if we're ready to use DIB as is, we can just do this:
+ // if ( ... )
+ // hbitmap = dib.Detach();
+ // else
+ {
+ // create and set the device-dependent bitmap
+ //
+ // VZ: why don't we just use SetDIBits() instead? because of the
+ // palette or is there some other reason?
+ hbitmap = ::CreateCompatibleBitmap(ScreenHDC(), w, h);
+ if ( !hbitmap )
+ {
+ wxLogLastError(_T("CreateCompatibleBitmap()"));
+
+ return FALSE;
+ }
+
+ MemoryHDC hdcMem;
+ SelectInHDC select(hdcMem, hbitmap);
+ if ( !select )
+ {
+ wxLogLastError(_T("SelectObjct(hBitmap)"));
+ }
+
+#if wxUSE_PALETTE
+ const wxPalette& palette = image.GetPalette();
+
+ HPALETTE hOldPalette;
+ if ( palette.Ok() )
+ {
+ SetPalette(palette);
+
+ hOldPalette = ::SelectPalette
+ (
+ hdcMem,
+ GetHpaletteOf(palette),
+ FALSE // ignored for hdcMem
+ );
+
+ if ( !hOldPalette )
+ {
+ wxLogLastError(_T("SelectPalette()"));
+ }
+
+ if ( ::RealizePalette(hdcMem) == GDI_ERROR )
+ {
+ wxLogLastError(_T("RealizePalette()"));
+ }
+ }
+ else // no valid palette
+ {
+ hOldPalette = 0;
+ }
+#endif // wxUSE_PALETTE
+
+ DIBSECTION ds;
+ if ( !::GetObject(dib.GetHandle(), sizeof(ds), &ds) )
+ {
+ wxLogLastError(_T("GetObject(hDIB)"));
+ }
+
+ if ( ::StretchDIBits(hdcMem,
+ 0, 0, w, h,
+ 0, 0, w, h,
+ dib.GetData(),
+ (BITMAPINFO *)&ds.dsBmih,
+ DIB_RGB_COLORS,
+ SRCCOPY) == GDI_ERROR )
+ {
+ wxLogLastError(_T("StretchDIBits()"));
+
+ return FALSE;
+ }
+
+#if wxUSE_PALETTE
+ if ( hOldPalette )
+ {
+ ::SelectPalette(hdcMem, hOldPalette, FALSE);
+ }
+#endif // wxUSE_PALETTE
+ }
+
+ // validate this object
+ SetHBITMAP((WXHBITMAP)hbitmap);
+
+#if WXWIN_COMPATIBILITY_2
+ m_refData->m_ok = TRUE;
+#endif // WXWIN_COMPATIBILITY_2
+
+ // finally also set the mask if we have one
+ if ( image.HasMask() )
+ {
+ SetMask(new wxMask(*this, wxColour(image.GetMaskRed(),
+ image.GetMaskGreen(),
+ image.GetMaskBlue())));
+ }
+
+ return TRUE;
projects / wxWidgets.git / blobdiff