Hello,

I am pretty new in the OpenVG application development. I am using OpenVG1.1 libraries for the same. I need to improve 
the line drawing quality in my existing QNX/ARM/IMX35 based application. 

The line drawing quality is not good in the existing app, therefore I want to apply Multi-sampling on the drawing, but 
not sure the correct method of applying it in OpenVG.

Following are the EGL config attributes I'm using in my application:

EGLint egl_conf_attr[] = {
    EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
    EGL_RENDERABLE_TYPE, EGL_OPENVG_BIT,
    EGL_DEPTH_SIZE, EGL_DONT_CARE,
    EGL_LEVEL, EGL_DONT_CARE,
    EGL_TRANSPARENT_TYPE, EGL_DONT_CARE,
    EGL_RED_SIZE, EGL_DONT_CARE,
    EGL_GREEN_SIZE, EGL_DONT_CARE,
    EGL_BLUE_SIZE, EGL_DONT_CARE,
    EGL_ALPHA_SIZE, EGL_DONT_CARE,
    EGL_BUFFER_SIZE, EGL_DONT_CARE,
    EGL_SAMPLE_BUFFERS, 0, /* value 1 doesn't work*/
    EGL_STENCIL_SIZE, EGL_DONT_CARE,
    EGL_SAMPLES, EGL_DONT_CARE,
    EGL_CONFIG_ID, EGL_DONT_CARE,
    EGL_NONE
};

I have already been using vgSeti(VG_IMAGE_QUALITY, VG_IMAGE_QUALITY_BETTER) API so that OpenVG applies anti-aliasing, 
but the line quality is still poor and lines are jagged.

As per OpenVG/EGL documents i.e. "openvg-1.1.pdf" and "eglspec.1.4.withchanges.20090422.pdf", EGL_SAMPLE_BUFFERS 
attribute can be used for multisampling. But setting the value of EGL_SAMPLE_BUFFERS as 1 (default is 0), fails the 
eglChooseConfig() API.  

Can someone let me know how to use multisampling (antialiasing) in OpenVG image drawing? Some sample code/example would 
be really helpful. Attached is the sample code I am using for the proof of concept which draws two diagonal lines.


Thanks a lot.
Shivendra