Examples with BLENDFUNCTION com.sun.jna.platform.win32.WinUser.BLENDFUNCTION used on opensource projects

Example 1 with BLENDFUNCTION

use of com.sun.jna.platform.win32.WinUser.BLENDFUNCTION in project jna by java-native-access.

the class AlphaMaskDemo method updateW32.

private void updateW32(boolean a, boolean i) {
    User32 user = User32.INSTANCE;
    GDI32 gdi = GDI32.INSTANCE;
    HWND hWnd = null;
    if (!alphaWindow.isDisplayable()) {
        alphaWindow.pack();
        hWnd = getHwnd(alphaWindow);
        int flags = user.GetWindowLong(hWnd, WinUser.GWL_EXSTYLE);
        flags |= WinUser.WS_EX_LAYERED;
        user.SetWindowLong(hWnd, WinUser.GWL_EXSTYLE, flags);
        Window parent = alphaWindow.getOwner();
        Point where = parent.getLocationOnScreen();
        where.translate(parent.getWidth(), 0);
        alphaWindow.setLocation(where);
    } else {
        hWnd = getHwnd(alphaWindow);
    }
    if (i) {
        int w = image.getWidth(null);
        int h = image.getHeight(null);
        HDC screenDC = user.GetDC(null);
        HDC memDC = gdi.CreateCompatibleDC(screenDC);
        HBITMAP hBitmap = null;
        HANDLE oldBitmap = null;
        try {
            BufferedImage buf = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB_PRE);
            Graphics g = buf.getGraphics();
            g.drawImage(image, 0, 0, w, h, null);
            BITMAPINFO bmi = new BITMAPINFO();
            bmi.bmiHeader.biWidth = w;
            bmi.bmiHeader.biHeight = h;
            bmi.bmiHeader.biPlanes = 1;
            bmi.bmiHeader.biBitCount = 32;
            bmi.bmiHeader.biCompression = WinGDI.BI_RGB;
            bmi.bmiHeader.biSizeImage = w * h * 4;
            PointerByReference ppbits = new PointerByReference();
            hBitmap = gdi.CreateDIBSection(memDC, bmi, WinGDI.DIB_RGB_COLORS, ppbits, null, 0);
            oldBitmap = gdi.SelectObject(memDC, hBitmap);
            Pointer pbits = ppbits.getValue();
            Raster raster = buf.getData();
            int[] pixel = new int[4];
            int[] bits = new int[w * h];
            for (int y = 0; y < h; y++) {
                for (int x = 0; x < w; x++) {
                    raster.getPixel(x, h - y - 1, pixel);
                    int alpha = (pixel[3] & 0xFF) << 24;
                    int red = (pixel[2] & 0xFF);
                    int green = (pixel[1] & 0xFF) << 8;
                    int blue = (pixel[0] & 0xFF) << 16;
                    bits[x + y * w] = alpha | red | green | blue;
                }
            }
            pbits.write(0, bits, 0, bits.length);
            SIZE size = new SIZE();
            size.cx = w;
            size.cy = h;
            POINT loc = new POINT();
            loc.x = alphaWindow.getX();
            loc.y = alphaWindow.getY();
            POINT srcLoc = new POINT();
            BLENDFUNCTION blend = new BLENDFUNCTION();
            blend.SourceConstantAlpha = (byte) (alpha * 255);
            blend.AlphaFormat = WinUser.AC_SRC_ALPHA;
            user.UpdateLayeredWindow(hWnd, screenDC, loc, size, memDC, srcLoc, 0, blend, WinUser.ULW_ALPHA);
        } finally {
            user.ReleaseDC(null, screenDC);
            if (hBitmap != null) {
                gdi.SelectObject(memDC, oldBitmap);
                gdi.DeleteObject(hBitmap);
            }
            gdi.DeleteDC(memDC);
        }
    } else if (a) {
        BLENDFUNCTION blend = new BLENDFUNCTION();
        blend.SourceConstantAlpha = (byte) (alpha * 255);
        blend.AlphaFormat = WinUser.AC_SRC_ALPHA;
        user.UpdateLayeredWindow(hWnd, null, null, null, null, null, 0, blend, WinUser.ULW_ALPHA);
    }
    if (!alphaWindow.isVisible()) {
        alphaWindow.setVisible(true);
    }
}