New public API pub fn expand_interlaced_row
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Example code that depends on the new API can be seen in http://review.skia.org/894576 |
adetaylor
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Aug 30, 2024
adetaylor
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Aug 30, 2024
adetaylor
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Aug 30, 2024
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This helps with the following things: * It means that after making `InterlaceInfo` public in a follow-up commit, `pass`, `line`, and `width` fields can remain private. * It means that a follow-up commit that refactors `adam7::expand_pass` to take a single `info` parameter doesn't allow passing an invalid `InterlaceInfo::Null` value. * It gives `Adam7Iterator` a nicer, named `Iterator::Item`.
Instead of passing `line_no` and `pass` as separate parameters, we can pass a single `&Adam7Info` parameter. This minor refactoring helps with: * Exposing a nice public API in a follow-up commit * Depending on `Adam7Info.width` in a follow-up commit
Instead of passing `line_no` and `pass` as separate parameters, we can pass a single `&Adam7Info` parameter. This minor refactoring helps with: * Cleaning up `fn expand_pass` by moving some of its complexity closer to where its needed (within `fn expand_adam7_bits`) * Preparing for changing the semantics of the `width` parameter of `fn expand_adam7_bits` in a follow-up commit, where we will stop depending on `width` for calculating the length of the returned iterator (depending on `Adam7Info.width` instead). See the follow-up commit for more details.
This commit refactors implementation of `expand_adam7_bits` so that it can accept `row_stride_in_bytes` that is different from the expanded width of the frame or image. This is helpful for making `expand_pass` work in scenarios where interlaced row needs to expanded into a bigger image (e.g. if the currently decoded frame is an animation frame that only takes a subregion of the whole image - in this case the stride between expanded rows is bigger than the size of expanded rows). And the above is helpful for exposing `expand_pass` through a public API that will hopefully pass the test of time...
This also exposes supporting items through the public API: `Adam7Info`, `InterlaceInfo`, `InterlacedRow`.
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HeroicKatora
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Sep 9, 2024
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Can you please hold off with publishing a new version of the This PR adds I'll try to push new commits/changes to the other PR today or tomorrow. |
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This is a clean-up / follow-up for http://review.skia.org/889877 where we implemented `onIncrementalDecode` but only for non-interlaced images. Note that this CL depends on new public APIs in the `png` crate (ones that are not yet present in `png-0.17.13`). Therefore this CL depends on having a post-0.17.3 crate version when building `FFI.rs`: * In the short-term this dependency is fulfilled by patching the crate in https://crrev.com/c/5825297 * In the long-term this dependency will be met by a new release of the `png` crate (the PR at image-rs/image-png#495 hasn't been released yet). Bug: chromium:356923435 Change-Id: I2787c2f5a9b256720e779ea0acc8737c87cee2c3 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/894576 Commit-Queue: Łukasz Anforowicz <lukasza@google.com> Reviewed-by: Brian Osman <brianosman@google.com>
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Currently users of
Reader.next_interlaced_rowcan't handle interlaced rows without re-implementing significant chunks of thepngcrate. This PR resolves this by exposing a new public API:pub fn expand_interlaced_row+pub enum InterlaceInfo.