+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)
+{
+ return CreateFromImage(image, depth, 0);
+}
+
+bool wxBitmap::CreateFromImage(const wxImage& image, const wxDC& dc)
+{
+ wxCHECK_MSG( dc.Ok(), FALSE,
+ _T("invalid HDC in wxBitmap::CreateFromImage()") );
+
+ return CreateFromImage(image, -1, dc.GetHDC());
+}
+
+bool wxBitmap::CreateFromImage(const wxImage& image, int depth, WXHDC hdc )
+{
+#if wxUSE_WXDIB
+ 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_hasAlpha = image.HasAlpha();
+
+ m_refData = refData;
+
+
+ // next either store DIB as is or create a DDB from it
+ HBITMAP hbitmap;
+
+ // are we going to use DIB?
+ //
+ // NB: DDBs don't support alpha so if we have alpha channel we must use DIB
+ if ( image.HasAlpha() || wxShouldCreateDIB(w, h, depth, hdc) )
+ {
+ // don't delete the DIB section in dib object dtor
+ hbitmap = dib.Detach();
+
+ refData->m_isDIB = TRUE;
+ refData->m_depth = dib.GetDepth();
+ }
+ else // we need to convert DIB to DDB
+ {
+ hbitmap = dib.CreateDDB((HDC)hdc);
+
+ refData->m_depth = depth == -1 ? wxDisplayDepth() : depth;
+ }
+
+ // validate this object
+ SetHBITMAP((WXHBITMAP)hbitmap);
+
+ // 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;
+#else
+ // FIXME: wxWinCE doesn't support wxDIB yet
+ return FALSE;
+#endif
+}
+
+wxImage wxBitmap::ConvertToImage() const
+{
+ // FIXME: this is untested code for WinCE, and
+ // the mask is not yet handled.
+ // For tips, see:
+ // http://www.codeproject.com/bitmap/dibsection.asp?print=true
+
+#ifdef __WXWINCE__
+ // the colour used as transparent one in wxImage and the one it is replaced
+ // with when it really occurs in the bitmap
+ static const int MASK_RED = 1;
+ static const int MASK_GREEN = 2;
+ static const int MASK_BLUE = 3;
+ static const int MASK_BLUE_REPLACEMENT = 2;
+
+ 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;
+ }
+
+ // calc the number of bytes per scanline and padding in the DIB
+ int bytePerLine = width*3;
+ int sizeDWORD = sizeof( DWORD );
+ int lineBoundary = bytePerLine % sizeDWORD;
+ int padding = 0;
+ if( lineBoundary > 0 )
+ {
+ padding = sizeDWORD - lineBoundary;
+ bytePerLine += padding;
+ }
+
+ // create a DIB header
+ int headersize = sizeof(BITMAPINFOHEADER);
+ BITMAPINFO *lpDIBh = (BITMAPINFO *) malloc( headersize );
+ if( !lpDIBh )
+ {
+ wxFAIL_MSG( wxT("could not allocate data for DIB header") );
+ free( data );
+ return wxNullImage;
+ }
+ // Fill in the DIB header
+ lpDIBh->bmiHeader.biSize = headersize;
+ lpDIBh->bmiHeader.biWidth = width;
+ lpDIBh->bmiHeader.biHeight = -height;
+ lpDIBh->bmiHeader.biSizeImage = bytePerLine * height;
+ lpDIBh->bmiHeader.biPlanes = 1;
+ lpDIBh->bmiHeader.biBitCount = 24;
+ lpDIBh->bmiHeader.biCompression = BI_RGB;
+ lpDIBh->bmiHeader.biClrUsed = 0;
+ // These seem not really needed for our purpose here.
+ lpDIBh->bmiHeader.biClrImportant = 0;
+ lpDIBh->bmiHeader.biXPelsPerMeter = 0;
+ lpDIBh->bmiHeader.biYPelsPerMeter = 0;
+
+ // memory for DIB data is allocated by CreateDIBSection
+ void *lpBits = NULL;
+
+ // copy data from the device-dependent bitmap to the DIB
+ HDC hdc = ::GetDC(NULL);
+ HBITMAP hBitmap = (HBITMAP) GetHBITMAP();
+
+ HBITMAP hBitmapSection = ::CreateDIBSection( hdc, lpDIBh, DIB_RGB_COLORS, & lpBits, NULL, 0 );
+ if (!hBitmapSection)
+ {
+ wxFAIL_MSG( wxT("could not create a DIB section") );
+ return wxNullImage;
+ }
+
+ // Copy the image from the DDB to the DIBSection
+ // Need to copy the supplied bitmap onto the newly created DIBsection
+ HDC hMemDC = CreateCompatibleDC(hdc);
+ HDC hCopyDC = CreateCompatibleDC(hdc);
+
+ if (! hMemDC || ! hCopyDC)
+ {
+ wxFAIL_MSG( wxT("unable to create compatible DCs") );
+ return wxNullImage;
+ }
+
+#if 0
+ if (m_hPal)
+ {
+ SelectPalette(hMemDC, m_hPal, FALSE); RealizePalette(hMemDC);
+ SelectPalette(hCopyDC, m_hPal, FALSE); RealizePalette(hCopyDC);
+ }
+#endif
+
+ HBITMAP hOldMemBitmap = (HBITMAP) SelectObject(hMemDC, hBitmap);
+ HBITMAP hOldCopyBitmap = (HBITMAP) SelectObject(hCopyDC, hBitmapSection);
+
+ BitBlt(hCopyDC, 0, 0, GetWidth(), GetHeight(), hMemDC, 0, 0, SRCCOPY);
+
+ SelectObject(hMemDC, hOldMemBitmap);
+ SelectObject(hCopyDC, hOldCopyBitmap);
+ DeleteDC(hMemDC);
+ DeleteDC(hCopyDC);
+
+#if 0
+ if (m_hPal)
+ {
+ HGDIOBJ hObj = ::GetStockObject(DEFAULT_PALETTE);
+ SelectObject(hMemDC, hObj);
+ SelectObject(hCopyDC, hObj);
+ }
+#endif
+
+ ReleaseDC(NULL, hdc);
+
+ // copy DIB data into the wxImage object
+ int i, j;
+ unsigned char *ptdata = data;
+ unsigned char *ptbits = (unsigned char*) lpBits;
+ for( i=0; i<height; i++ )
+ {
+ for( j=0; j<width; j++ )
+ {
+ *(ptdata++) = *(ptbits+2);
+ *(ptdata++) = *(ptbits+1);
+ *(ptdata++) = *(ptbits );
+ ptbits += 3;
+ }
+ ptbits += padding;
+ }
+
+ // TODO
+#if 0
+ // similarly, set data according to the possible mask bitmap
+ if( GetMask() && GetMask()->GetMaskBitmap() )
+ {
+ hbitmap = (HBITMAP) GetMask()->GetMaskBitmap();
+ // memory DC created, color set, data copied, and memory DC deleted
+ HDC memdc = ::CreateCompatibleDC( hdc );
+ ::SetTextColor( memdc, RGB( 0, 0, 0 ) );
+ ::SetBkColor( memdc, RGB( 255, 255, 255 ) );
+ ::GetDIBits( memdc, hbitmap, 0, height, lpBits, lpDIBh, DIB_RGB_COLORS );
+ ::DeleteDC( memdc );
+ ptdata = data;
+ ptbits = lpBits;
+ for( i=0; i<height; i++ )
+ {
+ for( j=0; j<width; j++ )
+ {
+ // is this pixel transparent?
+ if ( *ptbits != 0 )
+ {
+ if ( (ptdata[0] == MASK_RED) &&
+ (ptdata[1] == MASK_GREEN) &&
+ (ptdata[2] == MASK_BLUE) )
+ {
+ // we have to fudge the colour a bit to prevent this
+ // pixel from appearing transparent
+ ptdata[2] = MASK_BLUE_REPLACEMENT;
+ }
+ ptdata += 3;
+ }
+ else // masked pixel
+ {
+ *(ptdata++) = MASK_RED;
+ *(ptdata++) = MASK_GREEN;
+ *(ptdata++) = MASK_BLUE;
+ }
+ ptbits += 3;
+ }
+ ptbits += padding;
+ }
projects / wxWidgets.git / blobdiff