bool TextureContainer::CreateHalo() {
Image srcImage;
if(!srcImage.LoadFromFile(m_pTexture->getFileName())) {
return false;
}
// Allocate and add the texture to the linked list of textures;
res::path haloName = m_texName.string();
haloName.append("_halo");
TextureHalo = new TextureContainer(haloName, NoMipmap | NoColorKey);
if(!TextureHalo) {
return false;
}
TextureHalo->m_pTexture = GRenderer->CreateTexture2D();
if(!TextureHalo->m_pTexture) {
return true;
}
Image im;
int width = m_size.x + HALO_RADIUS * 2;
int height = m_size.y + HALO_RADIUS * 2;
im.Create(width, height, srcImage.GetFormat());
// Center the image, offset by radius to contain the edges of the blur
im.Clear();
im.Copy(srcImage, HALO_RADIUS, HALO_RADIUS);
// Keep a copy of the image at this stage, in order to apply proper alpha masking later
Image copy = im;
// Convert image to grayscale, and turn it to black & white
im.ToGrayscale(Image::Format_L8A8);
im.ApplyThreshold(0, ~0);
// Blur the image
im.Blur(HALO_RADIUS);
// Increase the gamma of the blur outline
im.QuakeGamma(10.0f);
// Set alpha to inverse of original image alpha
copy.ApplyColorKeyToAlpha();
im.SetAlpha(copy, true);
TextureHalo->m_pTexture->Init(im, 0);
TextureHalo->m_size.x = TextureHalo->m_pTexture->getSize().x;
TextureHalo->m_size.y = TextureHalo->m_pTexture->getSize().y;
Vec2i storedSize = TextureHalo->m_pTexture->getStoredSize();
TextureHalo->uv = Vec2f(
float(TextureHalo->m_size.x) / storedSize.x,
float(TextureHalo->m_size.y) / storedSize.y
);
TextureHalo->hd = Vec2f(.5f / storedSize.x, .5f / storedSize.y);
return true;
}
