-// Some experiments...
-#if 0
- // What we want to do is create another bitmap which has a depth of 4,
- // and set the bits. So probably we want to convert this HBITMAP into a
- // DIB, then call SetDIBits.
- // AAAGH. The stupid thing is that if newBitmap has a depth of 4 (less than that of
- // the screen), then SetDIBits fails.
- HBITMAP newBitmap = ::CreateBitmap(totalBitmapWidth, totalBitmapHeight, 1, 4, NULL);
- HANDLE newDIB = ::BitmapToDIB((HBITMAP) m_hBitmap, NULL);
- LPBITMAPINFOHEADER lpbmi = (LPBITMAPINFOHEADER) GlobalLock(newDIB);
-
- dc = ::GetDC(NULL);
-// LPBITMAPINFOHEADER lpbmi = (LPBITMAPINFOHEADER) newDIB;
-
- int result = ::SetDIBits(dc, newBitmap, 0, lpbmi->biHeight, FindDIBBits((LPSTR)lpbmi), (LPBITMAPINFO)lpbmi,
- DIB_PAL_COLORS);
- DWORD err = GetLastError();
-
- ::ReleaseDC(NULL, dc);
-
- // Delete the DIB
- GlobalUnlock (newDIB);
- GlobalFree (newDIB);
-
-// WXHBITMAP hBitmap2 = wxCreateMappedBitmap((WXHINSTANCE) wxGetInstance(), (WXHBITMAP) m_hBitmap);
- // Substitute our new bitmap for the old one
- ::DeleteObject((HBITMAP) m_hBitmap);
- m_hBitmap = (WXHBITMAP) newBitmap;
-#endif
+ // create the target bitmap
+ HBITMAP hbmpDst = ::CreateCompatibleBitmap(hdcDst, width, height);
+ if ( !hbmpDst )
+ {
+ wxLogLastError(_T("CreateCompatibleBitmap"));
+
+ return bitmap;
+ }
+
+ // create the monochrome mask bitmap
+ HBITMAP hbmpMask = ::CreateBitmap(width, height, 1, 1, 0);
+ if ( !hbmpMask )
+ {
+ wxLogLastError(_T("CreateBitmap(mono)"));
+
+ ::DeleteObject(hbmpDst);
+
+ return bitmap;
+ }
+
+ SelectInHDC bmpInDst(hdcDst, hbmpDst),
+ bmpInMask(hdcMask, hbmpMask);
+
+ // for each colour:
+ for ( n = 0; n < NUM_OF_MAPPED_COLOURS; n++ )
+ {
+ // create the mask for this colour
+ ::SetBkColor(hdcMem, ColorMap[n].from);
+ ::BitBlt(hdcMask, 0, 0, width, height, hdcMem, 0, 0, SRCCOPY);
+
+ // replace this colour with the target one in the dst bitmap
+ HBRUSH hbr = ::CreateSolidBrush(ColorMap[n].to);
+ HGDIOBJ hbrOld = ::SelectObject(hdcDst, hbr);
+
+ ::MaskBlt(hdcDst, 0, 0, width, height,
+ hdcMem, 0, 0,
+ hbmpMask, 0, 0,
+ MAKEROP4(PATCOPY, SRCCOPY));
+
+ (void)::SelectObject(hdcDst, hbrOld);
+ ::DeleteObject(hbr);
+ }
+
+ ::DeleteObject((HBITMAP)bitmap);
+
+ return (WXHBITMAP)hbmpDst;
+#endif // 0
+}