Aero: How to draw solid (opaque) colors on glass?

Question

Using GDI+ to draw various colors:

brush = new SolidBrush(color);
graphics.FillRectangle(brush, x, y, width, height);

You\'ll notice that n

Answer 1

I met the same issue with GDI.
GDI uses zero alpha channel value, so the simpliest solution is to fix alpha channel like this code does:

void fix_alpha_channel()
{
    std::vector pixels(cx * cy);

    BITMAPINFOHEADER bmpInfo = {0};
    bmpInfo.biSize = sizeof(bmpInfo);
    bmpInfo.biWidth = cx;
    bmpInfo.biHeight = -int(cy);
    bmpInfo.biPlanes = 1;
    bmpInfo.biBitCount = 32;
    bmpInfo.biCompression = BI_RGB;

    GetDIBits(memDc, hBmp, 0, cy, &pixels[0], (LPBITMAPINFO)&bmpInfo, DIB_RGB_COLORS);

    std::for_each(pixels.begin(), pixels.end(), [](COLORREF& pixel){
        if(pixel != 0) // black pixels stay transparent
            pixel |= 0xFF000000; // set alpha channel to 100%
    });

    SetDIBits(memDc, hBmp, 0, cy, &pixels[0], (LPBITMAPINFO)&bmpInfo, DIB_RGB_COLORS);
}