Reland "Add API for discovering assets" (#119277)

* add asset manifest bin loading and asset manifest api

* use new api for image resolution

* remove upfront smc data casting

* fix typecasting issue

* remove unused import

* fix tests

* lints

* lints

* fix import

* revert image resolution changes

* Update image_resolution_test.dart

* Update decode_and_parse_asset_manifest.dart

* make targetDevicePixelRatio optional

* Update packages/flutter/lib/src/services/asset_manifest.dart

Co-authored-by: Jonah Williams <jonahwilliams@google.com>

* Update packages/flutter/lib/src/services/asset_manifest.dart

Co-authored-by: Jonah Williams <jonahwilliams@google.com>

* fix immutable not being imported

* return List in AssetManifest methods, fix annotation import

* simplify onError callback

* make AssetManifest methods abstract instead of throwing UnimplementedError

* simplify AssetVariant.key docstring

* tweak _AssetManifestBin docstring

* make AssetManifest and AssetVariant doc strings more specific

* use List.of instead of List.from for type-safety

* adjust import

* change _AssetManifestBin comment from doc comment to normal comment

* revert to callback function for onError in loadStructuredBinaryData

* add more to the docstring of AssetManifest.listAssets and AssetVariant.key

* add tests for CachingAssetBundle caching behavior

* add simple test to ensure loadStructuredBinaryData correctly calls load

* Update asset_manifest.dart

* update docstring for AssetManifest.getAssetVariants

* rename getAssetVariants, have it include main asset

* rename isMainAsset field of AssetMetadata to main

* (slightly) shorten name of describeAssetAndVariants

* rename describeAssetVariants back to getAssetVariants

* add tests for TestAssetBundle

* nits

* fix typo in docstring

* remove no longer necessary non-null asserts

* update gallery and google_fonts versions

---------

Co-authored-by: Jonah Williams <jonahwilliams@google.com>
7 files changed
tree: 4b96e20ba779240f65d3543fa56147c8155d96ab
  1. .github/
  2. bin/
  3. dev/
  4. examples/
  5. packages/
  6. .ci.yaml
  7. .cirrus.yml
  8. .gitattributes
  9. .gitignore
  10. analysis_options.yaml
  11. AUTHORS
  12. CODE_OF_CONDUCT.md
  13. CODEOWNERS
  14. CONTRIBUTING.md
  15. dartdoc_options.yaml
  16. flutter_console.bat
  17. LICENSE
  18. PATENT_GRANT
  19. README.md
  20. TESTOWNERS
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