re_viewer_context 0.31.2

Rerun viewer state that is shared with the viewer's code components.
Documentation 
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use ahash::{HashMap, HashSet};
use re_byte_size::SizeBytes as _;
use re_chunk_store::ChunkStoreEvent;
use re_entity_db::EntityDb;
use re_sdk_types::image::ImageKind;
use re_sdk_types::{Component as _, components};

use crate::image_info::StoredBlobCacheKey;
use crate::{Cache, ImageInfo, ImageStats};

// Caches image stats (use e.g. `RowId` to generate cache key).
#[derive(Default)]
pub struct ImageStatsCache(HashMap<(StoredBlobCacheKey, ImageKind), ImageStats>);

impl ImageStatsCache {
    pub fn entry(&mut self, image: &ImageInfo) -> ImageStats {
        *self
            .0
            .entry((image.buffer_content_hash, image.kind))
            .or_insert_with(|| ImageStats::from_image(image))
    }
}

impl Cache for ImageStatsCache {
    fn name(&self) -> &'static str {
        "ImageStatsCache"
    }

    fn purge_memory(&mut self) {
        // Purging the image stats is not worth it - these are very small objects!
    }

    fn on_store_events(&mut self, events: &[&ChunkStoreEvent], _entity_db: &EntityDb) {
        re_tracing::profile_function!();

        let cache_key_removed: HashSet<(StoredBlobCacheKey, ImageKind)> = events
            .iter()
            .filter_map(|e| e.to_deletion())
            .flat_map(|del| {
                del.chunk
                    .component_descriptors()
                    .filter(|descr| descr.component_type == Some(components::Blob::name()))
                    .flat_map(|descr| {
                        let kind = ImageKind::from_archetype_name(descr.archetype);
                        del.chunk.row_ids().map(move |row_id| {
                            (StoredBlobCacheKey::new(row_id, descr.component), kind)
                        })
                    })
            })
            .collect();

        self.0
            .retain(|cache_key, _per_key| !cache_key_removed.contains(cache_key));
    }
}

impl re_byte_size::MemUsageTreeCapture for ImageStatsCache {
    fn capture_mem_usage_tree(&self) -> re_byte_size::MemUsageTree {
        re_byte_size::MemUsageTree::Bytes(self.0.total_size_bytes())
    }
}