Hi,

I'm just starting to play with OpenVG and ran the tiger example of the reference implementation on Win32. I noticed CPU load remains high even after rendering is complete. The reason is Windows keeps sending WM_PAINT messages because as far as it is concerned the drawing area is still "dirty". All that is needed is a ValidateRect() call to stop the flood of WM_PAINT messages.

Change:
Code :
    case WM_PAINT:
    {
        RECT rect;
        InvalidateRect(hWnd, NULL, 0);
        GetClientRect(hWnd, &rect);
        render(rect.right - rect.left, rect.bottom - rect.top);
        return 0;
    }

To
Code :
    case WM_PAINT:
    {
        if (GetUpdateRect(hWnd, NULL, FALSE))
        {
            RECT rect;
            GetClientRect(hWnd, &rect);
            render(rect.right - rect.left, rect.bottom - rect.top);
            ValidateRect(hWnd, &rect);
        }
        return 0;
    }

Please let me know if there is a better place to post fixes.

Cheers,
Erik