vgSeti(VG_RENDERING_QUALITY, VG_RENDERING_QUALITY_BETTER);
vgSeti(VG_IMAGE_QUALITY, VG_IMAGE_QUALITY_BETTER);
vgSeti(VG_SCISSORING, VG_FALSE);
vgSeti(VG_MASKING, VG_TRUE);

// create image and load external data
imgSrc = vgCreateImage(VG_lRGBA_8888, imgBarbaraAlphaWidth, imgBarbaraAlphaHeight, VG_IMAGE_QUALITY_NONANTIALIASED);
vgImageSubData(imgSrc, (const void *)&imgBarbaraAlphaData[imgBarbaraAlphaWidth * (imgBarbaraAlphaHeight - 1)], -imgBarbaraAlphaDataStride, imgBarbaraAlphaFormat, 0, 0, imgBarbaraAlphaWidth, imgBarbaraAlphaHeight);
imgTmp = vgCreateImage(VG_lRGBA_8888, imgBarbaraAlphaWidth, imgBarbaraAlphaHeight, VG_IMAGE_QUALITY_NONANTIALIASED);
vgImageSubData(imgTmp, (const void *)imgBarbaraAlphaData, imgBarbaraAlphaDataStride, imgBarbaraAlphaFormat, 0, 0, imgBarbaraAlphaWidth, imgBarbaraAlphaHeight);

// create a path
path0 = vgCreatePath(VG_PATH_FORMAT_STANDARD, VG_PATH_DATATYPE_F, 1.0f, 0.0f, 0, 0, VG_PATH_CAPABILITY_ALL);
vguRect(path0, 10.0f, 10.0f, 236.0f, 236.0f);
vgSeti(VG_MATRIX_MODE, VG_MATRIX_PATH_USER_TO_SURFACE);
vgLoadIdentity();

// create and set a paint for fill
fillPaint = vgCreatePaint();
vgSetParameteri(fillPaint, VG_PAINT_TYPE, VG_PAINT_TYPE_COLOR);
vgSetColor(fillPaint, 0x8080FFFF);
vgSetPaint(fillPaint, VG_FILL_PATH);

// set clear color
col[0] = 1.0f; col[1] = 1.0f; col[2] = 1.0f; col[3] = 1.0f;
vgSetfv(VG_CLEAR_COLOR, 4, col);

// test CLEAR operation
vgClear(0, 0, 256, 256);
vgMask(imgSrc, VG_SET_MASK, 0, 0, 256, 256);
vgMask(VG_INVALID_HANDLE, VG_CLEAR_MASK, -128, -128, 256, 256);
vgDrawPath(path0, VG_FILL_PATH);
saveDrawingSurface(f, "vgmasking_clear.png", "vgMask CLEAR operation.", 0, 0, 256, 256);
eglSwapBuffers(display, surface);
// test FILL operation
vgClear(0, 0, 256, 256);
vgMask(imgSrc, VG_SET_MASK, 0, 0, 256, 256);
vgMask(VG_INVALID_HANDLE, VG_FILL_MASK, 128, 128, 256, 256);
vgDrawPath(path0, VG_FILL_PATH);
saveDrawingSurface(f, "vgmasking_fill.png", "vgMask FILL operation.", 0, 0, 256, 256);
eglSwapBuffers(display, surface);
// test SET operation
vgClear(0, 0, 256, 256);
vgMask(imgSrc, VG_SET_MASK, 0, 0, 256, 256);
vgMask(imgTmp, VG_SET_MASK, -128, 0, 256, 256);
vgDrawPath(path0, VG_FILL_PATH);
saveDrawingSurface(f, "vgmasking_set.png", "vgMask SET operation.", 0, 0, 256, 256);
eglSwapBuffers(display, surface);
// test UNION operation
vgClear(0, 0, 256, 256);
vgMask(imgSrc, VG_SET_MASK, 0, 0, 256, 256);
vgMask(imgTmp, VG_UNION_MASK, 0, 0, 256, 256);
vgDrawPath(path0, VG_FILL_PATH);
saveDrawingSurface(f, "vgmasking_union.png", "vgMask UNION operation.", 0, 0, 256, 256);
eglSwapBuffers(display, surface);
// test INTERSECT operation
vgClear(0, 0, 256, 256);
vgMask(imgSrc, VG_SET_MASK, 0, 0, 256, 256);
vgMask(imgTmp, VG_INTERSECT_MASK, 0, 0, 256, 256);
vgDrawPath(path0, VG_FILL_PATH);
saveDrawingSurface(f, "vgmasking_intersect.png", "vgMask INTERSECT operation.", 0, 0, 256, 256);
eglSwapBuffers(display, surface);
// test SUBTRACT operation
vgClear(0, 0, 256, 256);
vgMask(imgSrc, VG_SET_MASK, 0, 0, 256, 256);
vgMask(imgTmp, VG_SUBTRACT_MASK, 0, 0, 256, 256);
vgDrawPath(path0, VG_FILL_PATH);
saveDrawingSurface(f, "vgmasking_subtract.png", "vgMask SUBTRACT operation.", 0, 0, 256, 256);
eglSwapBuffers(display, surface);

vgDestroyImage(imgSrc);
vgDestroyImage(imgTmp);
vgDestroyPath(path0);
vgDestroyPaint(fillPaint);