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use crate::{buffer, Document};
#[cfg(feature = "import")]
use image_crate::DynamicImage;
/// Format of image pixel data.
#[cfg(feature = "import")]
#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
pub enum Format {
/// Red only.
R8,
/// Red, green.
R8G8,
/// Red, green, blue.
R8G8B8,
/// Red, green, blue, alpha.
R8G8B8A8,
/// Blue, green, red.
B8G8R8,
/// Blue, green, red, alpha.
B8G8R8A8,
}
/// Describes an image data source.
#[derive(Clone, Debug)]
pub enum Source<'a> {
/// Image data is contained in a buffer view.
View {
/// The buffer view containing the encoded image data.
view: buffer::View<'a>,
/// The image data MIME type.
mime_type: &'a str,
},
/// Image data is contained in an external data source.
Uri {
/// The URI of the external data source.
uri: &'a str,
/// The image data MIME type, if provided.
mime_type: Option<&'a str>,
},
}
/// Image data used to create a texture.
#[derive(Clone, Debug)]
pub struct Image<'a> {
/// The parent `Document` struct.
document: &'a Document,
/// The corresponding JSON index.
index: usize,
/// The corresponding JSON struct.
json: &'a json::image::Image,
}
/// Image data belonging to an imported glTF asset.
#[cfg(feature = "import")]
#[derive(Clone, Debug)]
pub struct Data {
/// The image pixel data (8 bits per channel).
pub pixels: Vec<u8>,
/// The image pixel data format.
pub format: Format,
/// The image height in pixels.
pub width: u32,
/// The image width in pixels.
pub height: u32,
}
impl<'a> Image<'a> {
/// Constructs an `Image` from owned data.
pub(crate) fn new(
document: &'a Document,
index: usize,
json: &'a json::image::Image,
) -> Self {
Self {
document: document,
index: index,
json: json,
}
}
/// Returns the internal JSON index.
pub fn index(&self) -> usize {
self.index
}
/// Optional user-defined name for this object.
#[cfg(feature = "names")]
pub fn name(&self) -> Option<&str> {
self.json.name.as_ref().map(String::as_str)
}
/// Returns the image data source.
pub fn source(&self) -> Source<'a> {
if let Some(index) = self.json.buffer_view.as_ref() {
let view = self.document
.views()
.nth(index.value())
.unwrap();
let mime_type = self.json.mime_type
.as_ref()
.map(|x| x.0.as_str())
.unwrap();
Source::View { view, mime_type }
} else {
let uri = self.json.uri.as_ref().unwrap();
let mime_type = self.json.mime_type.as_ref().map(|x| x.0.as_str());
Source::Uri { uri, mime_type }
}
}
/// Optional application specific data.
pub fn extras(&self) -> &json::Extras {
&self.json.extras
}
}
#[cfg(feature = "import")]
impl Data {
/// Note: We don't implement `From<DynamicImage>` since we don't want
/// to expose such functionality to the user.
pub(crate) fn new(image: DynamicImage) -> Self {
use image_crate::GenericImageView;
let format = match image {
DynamicImage::ImageLuma8(_) => Format::R8,
DynamicImage::ImageLumaA8(_) => Format::R8G8,
DynamicImage::ImageRgb8(_) => Format::R8G8B8,
DynamicImage::ImageRgba8(_) => Format::R8G8B8A8,
DynamicImage::ImageBgr8(_) => Format::B8G8R8,
DynamicImage::ImageBgra8(_) => Format::B8G8R8A8,
};
let (width, height) = image.dimensions();
let pixels = image.raw_pixels();
Data { format, width, height, pixels }
}
}