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Make layout use available image data before querying the image cache.

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This commit is contained in:
Josh Matthews 2018-10-12 12:35:12 -04:00
parent 5f463d3c97
commit 49d2ea4f74
8 changed files with 102 additions and 5 deletions
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30
components/layout/fragment.rs
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@ -401,6 +401,11 @@ pub struct ImageFragmentInfo {
pub metadata: Option<ImageMetadata>,
}
enum ImageOrMetadata {
Image(Arc<Image>),
Metadata(ImageMetadata),
}
impl ImageFragmentInfo {
/// Creates a new image fragment from the given URL and local image cache.
///
@ -412,14 +417,29 @@ impl ImageFragmentInfo {
node: &N,
layout_context: &LayoutContext,
) -> ImageFragmentInfo {
let image_or_metadata = url.and_then(|url| {
layout_context.get_or_request_image_or_meta(node.opaque(), url, UsePlaceholder::Yes)
});
// First use any image data present in the element...
let image_or_metadata = node.image_data().and_then(|(image, metadata)| {
match (image, metadata) {
(Some(image), _) => Some(ImageOrMetadata::Image(image)),
(None, Some(metadata)) => Some(ImageOrMetadata::Metadata(metadata)),
_ => None,
}
}).or_else(|| url.and_then(|url| {
// Otherwise query the image cache for anything known about the associated source URL.
layout_context.get_or_request_image_or_meta(
node.opaque(),
url,
UsePlaceholder::Yes
).map(|result| match result {
ImageOrMetadataAvailable::ImageAvailable(i, _) => ImageOrMetadata::Image(i),
ImageOrMetadataAvailable::MetadataAvailable(m) => ImageOrMetadata::Metadata(m),
})
}));
let current_pixel_density = density.unwrap_or(1f64);
let (image, metadata) = match image_or_metadata {
Some(ImageOrMetadataAvailable::ImageAvailable(i, _)) => {
Some(ImageOrMetadata::Image(i)) => {
let height = (i.height as f64 / current_pixel_density) as u32;
let width = (i.width as f64 / current_pixel_density) as u32;
(
@ -434,7 +454,7 @@ impl ImageFragmentInfo {
}),
)
},
Some(ImageOrMetadataAvailable::MetadataAvailable(m)) => {
Some(ImageOrMetadata::Metadata(m)) => {
(
None,
Some(ImageMetadata {