[cairo] OpenVG

[Paul Brooker]

Hi there,
Has anyone had any success with the OpenVG backend? Im not sure that im setting up the surface correctly.  Here is the code im using to test with, i 
have verified that EGL+OpenVG works by drawing with OpenVG directly, but cant get cairo to work.

     cairo_t 		*cr;
     cairo_vg_context_t 	*cairo_ctx;
     cairo_surface_t 	*cairo_surf;
	EGLint i32WindowWidth, i32WindowHeight;
	EGLint i32NumConfigs, i32MajorVersion, i32MinorVersion;
	EGLDisplay			eglDisplay	= 0;
	EGLConfig			eglConfig	= 0;
	EGLSurface			eglSurface	= 0;
	EGLContext			eglContext	= 0;

	EGLNativeWindowType sWindow = (EGLNativeWindowType)0;

	eglDisplay = eglGetDisplay((EGLNativeDisplayType) EGL_DEFAULT_DISPLAY);
	eglInitialize(eglDisplay, &i32MajorVersion, &i32MinorVersion);
	eglBindAPI(EGL_OPENVG_API);

	static const EGLint ai32ConfigAttribs[] =
	{
		EGL_LEVEL,      	0,
		EGL_BUFFER_SIZE,     	16,
		EGL_SURFACE_TYPE,   EGL_WINDOW_BIT,
		EGL_RENDERABLE_TYPE, EGL_OPENVG_BIT,
		EGL_NONE
	};

	eglChooseConfig(eglDisplay, ai32ConfigAttribs, &eglConfig, 1, &i32NumConfigs) || (i32NumConfigs != 1);
	eglSurface = eglCreateWindowSurface(eglDisplay, eglConfig, sWindow, NULL);
	eglContext = eglCreateContext(eglDisplay, eglConfig, NULL, NULL);
	eglMakeCurrent(eglDisplay, eglSurface, eglSurface, eglContext);

	eglQuerySurface(eglDisplay, eglSurface, EGL_WIDTH, &i32WindowWidth);
	eglQuerySurface(eglDisplay, eglSurface, EGL_HEIGHT, &i32WindowHeight);

	vgSeti(VG_MATRIX_MODE, VG_MATRIX_PATH_USER_TO_SURFACE);

	VGfloat afClearColor[4];
	afClearColor[0] = 0.0f;
	afClearColor[1] = 0.0f;
	afClearColor[2] = 0.0f;
	afClearColor[3] = 1.0f;

	vgSetfv(VG_CLEAR_COLOR, 4, afClearColor);
	vgSeti(VG_RENDERING_QUALITY, VG_RENDERING_QUALITY_BETTER);
	vgLoadIdentity();
	vgScale((float)i32WindowWidth, (float)i32WindowHeight);
	vgClear(0, 0, i32WindowWidth, i32WindowHeight);

     cairo_ctx = cairo_vg_context_create_for_egl (eglDisplay, eglContext);
     cairo_surf = cairo_vg_surface_create (cairo_ctx, CAIRO_CONTENT_COLOR_ALPHA, i32WindowWidth, i32WindowHeight);

     cr = cairo_create(cairo_surf);

	cairo_set_source_rgb (cr, 1, 0, 0);
	cairo_rectangle (cr, 0, 0, 300, 300);
	cairo_fill (cr);

	eglSwapBuffers(eglDisplay, eglSurface);
	cairo_destroy(cr);

     eglDestroyContext(eglDisplay, eglContext);
     eglDestroySurface(eglDisplay, eglSurface);
     eglTerminate(eglDisplay);

Does anyone have any ideas? Any help would be much appreciated.

Thanx in advance,
Paul