// create image and load external data
imgSrc = vgCreateImage(VG_lRGBA_8888, imgGirlAlphaWidth, imgGirlAlphaHeight, VG_IMAGE_QUALITY_NONANTIALIASED);
vgImageSubData(imgSrc, (const void *)imgGirlAlphaData, imgGirlAlphaDataStride, imgGirlAlphaFormat, 0, 0, imgGirlAlphaWidth, imgGirlAlphaHeight);
imgDst = vgCreateImage(VG_lRGBA_8888, imgGirlAlphaWidth, imgGirlAlphaHeight, VG_IMAGE_QUALITY_NONANTIALIASED);

// set channel masks and a border color
vgSeti(VG_FILTER_CHANNEL_MASK, VG_RED | VG_GREEN | VG_BLUE | VG_ALPHA);
col[0] = 0.12f;
col[1] = 0.35f;
col[2] = 0.75f;
col[3] = 1.0f;
vgSetfv(VG_TILE_FILL_COLOR, 4, col);
vgSeti(VG_FILTER_FORMAT_LINEAR, VG_TRUE);
vgSeti(VG_FILTER_FORMAT_PREMULTIPLIED, VG_FALSE);

// Gaussian filter with standard deviation(s) 0.5
vgGaussianBlur(imgDst, imgSrc, 0.5f, 0.5f, VG_TILE_REFLECT);
vgGetImageSubData(imgDst, imgOutputDataRGBA, imgGirlAlphaDataStride, imgGirlAlphaFormat, 0, 0, imgGirlAlphaWidth, imgGirlAlphaHeight);
strcpy(imgFileName, "filter_gaussian_05.png");
saveImage32(f, imgFileName, "Gaussian filter with standard deviation(s) 0.5.", imgGirlAlphaWidth, imgGirlAlphaHeight, imgOutputDataRGBA, 0);

// Gaussian filter with standard deviation(s) 1.0
vgGaussianBlur(imgDst, imgSrc, 1.0f, 1.0f, VG_TILE_REFLECT);
vgGetImageSubData(imgDst, imgOutputDataRGBA, imgGirlAlphaDataStride, imgGirlAlphaFormat, 0, 0, imgGirlAlphaWidth, imgGirlAlphaHeight);
strcpy(imgFileName, "filter_gaussian_10.png");
saveImage32(f, imgFileName, "Gaussian filter with standard deviation(s) 1.0.", imgGirlAlphaWidth, imgGirlAlphaHeight, imgOutputDataRGBA, 0);

// Gaussian filter with standard deviation(s) 1.5
vgGaussianBlur(imgDst, imgSrc, 1.5f, 1.5f, VG_TILE_REFLECT);
vgGetImageSubData(imgDst, imgOutputDataRGBA, imgGirlAlphaDataStride, imgGirlAlphaFormat, 0, 0, imgGirlAlphaWidth, imgGirlAlphaHeight);
strcpy(imgFileName, "filter_gaussian_15.png");
saveImage32(f, imgFileName, "Gaussian filter with standard deviation(s) 1.5.", imgGirlAlphaWidth, imgGirlAlphaHeight, imgOutputDataRGBA, 0);

// Gaussian filter with standard deviation(s) 2.0
vgGaussianBlur(imgDst, imgSrc, 2.0f, 2.0f, VG_TILE_REFLECT);
vgGetImageSubData(imgDst, imgOutputDataRGBA, imgGirlAlphaDataStride, imgGirlAlphaFormat, 0, 0, imgGirlAlphaWidth, imgGirlAlphaHeight);
strcpy(imgFileName, "filter_gaussian_20.png");
saveImage32(f, imgFileName, "Gaussian filter with standard deviation(s) 2.0.", imgGirlAlphaWidth, imgGirlAlphaHeight, imgOutputDataRGBA, 0);

// Gaussian filter with standard deviation(s) 4.0
vgGaussianBlur(imgDst, imgSrc, 4.0f, 4.0f, VG_TILE_REFLECT);
vgGetImageSubData(imgDst, imgOutputDataRGBA, imgGirlAlphaDataStride, imgGirlAlphaFormat, 0, 0, imgGirlAlphaWidth, imgGirlAlphaHeight);
strcpy(imgFileName, "filter_gaussian_40.png");
saveImage32(f, imgFileName, "Gaussian filter with standard deviation(s) 4.0.", imgGirlAlphaWidth, imgGirlAlphaHeight, imgOutputDataRGBA, 0);

// Gaussian filter with standard deviation(s) 8.0
vgGaussianBlur(imgDst, imgSrc, 8.0f, 8.0f, VG_TILE_REFLECT);
vgGetImageSubData(imgDst, imgOutputDataRGBA, imgGirlAlphaDataStride, imgGirlAlphaFormat, 0, 0, imgGirlAlphaWidth, imgGirlAlphaHeight);
strcpy(imgFileName, "filter_gaussian_80.png");
saveImage32(f, imgFileName, "Gaussian filter with standard deviation(s) 8.0.", imgGirlAlphaWidth, imgGirlAlphaHeight, imgOutputDataRGBA, 0);

// Gaussian filter with standard deviation(s) 16.0
vgGaussianBlur(imgDst, imgSrc, 16.0f, 16.0f, VG_TILE_REFLECT);
vgGetImageSubData(imgDst, imgOutputDataRGBA, imgGirlAlphaDataStride, imgGirlAlphaFormat, 0, 0, imgGirlAlphaWidth, imgGirlAlphaHeight);
strcpy(imgFileName, "filter_gaussian_160.png");
saveImage32(f, imgFileName, "Gaussian filter with standard deviation(s) 16.0.", imgGirlAlphaWidth, imgGirlAlphaHeight, imgOutputDataRGBA, 0);

vgDestroyImage(imgSrc);
vgDestroyImage(imgDst);