compress unscaled when original is active

[tijmenbruggeman]

WordPress scales down the original image when big_image_size_threshold is hit (defaults to 2560px). The scaled down version will be used when a user requests the full image and generates thumbnails using the unscaled version.

Users wanted to compress the unscaled original image as well as these might take up a lot of disk space.

Changes

• src/class-tiny-image.php when original image exists, will also add a Tiny_Image_Size for the unscaled version;
• get_active_tinify_sizes will return the unscaled size when original is enabled;
• src/class-tiny-settings.php will preserve meta data on the unscaled version if enabled;

Considerations

• When the original is enabled, it will now count as two compressions as the unscaled version will also account for one. I thought it was better to give an estimate to be on the safe side.

[Copilot]

Pull request overview

This PR extends the plugin’s compression behavior to also optimize WordPress’s “unscaled original” file (stored in attachment metadata as original_image) when the scaled original is active, and updates sizing/credit estimation and tests accordingly.

Changes:

• Add an original_unscaled size concept and create a Tiny_Image_Size for it when original_image exists in attachment metadata.
• Treat original_unscaled as tied to the original size in settings (including preserve-metadata handling) and update free-compression estimates accordingly.
• Update unit and Playwright integration tests to reflect the additional implicit compression count.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
src/class-tiny-image.php	Introduces ORIGINAL_UNSCALED and creates an image-size entry from original_image metadata.
src/class-tiny-settings.php	Adds original_unscaled into the sizes map and allows preserve options for it; updates docblock typing/text.
test/unit/TinySettingsAdminTest.php	Updates expected sizes output and adds coverage for get_active_tinify_sizes() behavior.
test/integration/settings.spec.ts	Updates UI expectations for free compression estimates after the new implicit size is counted.

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