JNA Convert HICON to Java Image

问题

I knwo there is already an question like this. But its solution was not suitable for me because with the Sehellfolder Methode you can only get 16x16 and 32x32 sized icons. I have extracted a HICO with size of 256x256 and want to convert it into and Java Image like BufferedImage. I found and method for it to. But it does not work properly:

public static BufferedImage getIcon(final WinDef.HICON hIcon,int ICON_SIZE,short ICON_DEPTH,int ICON_BYTE_SIZE) {
    final int width = ICON_SIZE;
    final int height = ICON_SIZE;
    final short depth = ICON_DEPTH;
    final BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);

    final Memory lpBitsColor = new Memory(width * height * depth / ICON_BYTE_SIZE);
    final Memory lpBitsMask = new Memory(width * height * depth / ICON_BYTE_SIZE);
    final WinGDI.BITMAPINFO info = new WinGDI.BITMAPINFO();
    final WinGDI.BITMAPINFOHEADER hdr = new WinGDI.BITMAPINFOHEADER();
    info.bmiHeader = hdr;
    hdr.biWidth = width;
    hdr.biHeight = height;
    hdr.biPlanes = 1;
    hdr.biBitCount = depth;
    hdr.biCompression = WinGDI.BI_RGB;

    final WinDef.HDC hDC = User32.INSTANCE.GetDC(null);
    final WinGDI.ICONINFO piconinfo = new WinGDI.ICONINFO();
    User32.INSTANCE.GetIconInfo(hIcon, piconinfo);

    GDI32.INSTANCE.GetDIBits(hDC, piconinfo.hbmColor, 0, height, lpBitsColor, info, WinGDI.DIB_RGB_COLORS);
    GDI32.INSTANCE.GetDIBits(hDC, piconinfo.hbmMask, 0, height, lpBitsMask, info, WinGDI.DIB_RGB_COLORS);

    int r, g, b, a, argb;
    int x = 0, y = height - 1;
    for (int i = 0; i < lpBitsColor.size(); i = i + 3) {
        b = lpBitsColor.getByte(i) & 0xFF;
        g = lpBitsColor.getByte(i + 1) & 0xFF;
        r = lpBitsColor.getByte(i + 2) & 0xFF;
        a = 0xFF - lpBitsMask.getByte(i) & 0xFF;

        argb = a << 24 | r << 16 | g << 8 | b;
        image.setRGB(x, y, argb);
        x = (x + 1) % width;
        if (x == 0) {
            y--;
        }
    }

    User32.INSTANCE.ReleaseDC(null, hDC);
    GDI32.INSTANCE.DeleteObject(piconinfo.hbmColor);
    GDI32.INSTANCE.DeleteObject(piconinfo.hbmMask);

    return image;
}

Resulting Image

Do you know andy method that works better?

EDIT:

public static BufferedImage getImageByHICON(final int width, final int height, final WinNT.HANDLE hicon, final WinGDI.BITMAPINFOHEADER info) {
    final WinGDI.ICONINFO iconinfo = new WinGDI.ICONINFO();

    try {
        // GDI32 g32 = GDI32.INSTANCE;

        // get icon information

        if (!User32.INSTANCE.GetIconInfo(new WinDef.HICON(hicon.getPointer()), iconinfo)) { return null; }
        final WinDef.HWND hwdn = new WinDef.HWND();
        final WinDef.HDC dc = User32.INSTANCE.GetDC(hwdn);

        if (dc == null) {

            return null; }
        try {
            final int nBits = width * height * 4;
            // final BitmapInfo bmi = new BitmapInfo(1);

            final Memory colorBitsMem = new Memory(nBits);
            // // Extract the color bitmap
            final WinGDI.BITMAPINFO bmi = new WinGDI.BITMAPINFO();

            bmi.bmiHeader.biWidth = width;
            bmi.bmiHeader.biHeight = -height;
            bmi.bmiHeader.biPlanes = 1;
            bmi.bmiHeader.biBitCount = 32;
            bmi.bmiHeader.biCompression = WinGDI.BI_RGB;
            GDI32.INSTANCE.GetDIBits(dc, iconinfo.hbmColor, 0, height, colorBitsMem, bmi, WinGDI.DIB_RGB_COLORS);
            // g32.GetDIBits(dc, iconinfo.hbmColor, 0, size, colorBitsMem,
            // bmi,
            // GDI32.DIB_RGB_COLORS);
            final int[] colorBits = colorBitsMem.getIntArray(0, width * height);
            if (info.biBitCount < 32) {
                final Memory maskBitsMem = new Memory(nBits);
                // // Extract the mask bitmap
                GDI32.INSTANCE.GetDIBits(dc, iconinfo.hbmMask, 0, height, maskBitsMem, bmi, WinGDI.DIB_PAL_COLORS);
                // g32.GetDIBits(dc, iconinfo.hbmMask, 0, size,
                // maskBitsMem,
                // bmi,
                // // GDI32.DIB_RGB_COLORS);
                final int[] maskBits = maskBitsMem.getIntArray(0, width * height);
                // // // Copy the mask alphas into the color bits
                for (int i = 0; i < colorBits.length; i++) {
                    colorBits[i] = colorBits[i] | (maskBits[i] != 0 ? 0 : 0xFF000000);
                }
            }
            final BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
            bi.setRGB(0, 0, width, height, colorBits, 0, height);
            return bi;
        } finally {
            com.sun.jna.platform.win32.User32.INSTANCE.ReleaseDC(hwdn, dc);
        }
    } finally {
        User32.INSTANCE.DestroyIcon(new WinDef.HICON(hicon.getPointer()));
        GDI32.INSTANCE.DeleteObject(iconinfo.hbmColor);
        GDI32.INSTANCE.DeleteObject(iconinfo.hbmMask);
    }
}

Better Image

回答1:

You need to use the method from Example 3 from this website

来源：https://stackoverflow.com/questions/51983889/jna-convert-hicon-to-java-image