Bug 259960

Summary:	[Cocoa] Super gigantic images should not be decoded with their natural sizes
Product:	WebKit	Reporter:	Said Abou-Hallawa <sabouhallawa>
Component:	Images	Assignee:	Said Abou-Hallawa <sabouhallawa>
Status:	NEW ---
Severity:	Normal	CC:	sabouhallawa, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Description Said Abou-Hallawa 2023-08-08 18:07:04 PDT

Test case: https://upload.wikimedia.org/wikipedia/commons/e/ea/Van_Gogh_-_Starry_Night_-_Google_Art_Project.jpg

Image sub-sampling should be enabled for macOS so the number of the decoded pixels is scaled down by the ratio between destinationSize and sourceSize.

For non-scaled display, sub-images should be used to display the image on different tiles. The size of the sub-image will be the mapping of the destination rectangle clipped by the GraphicsContext.bounds() in the image rectangle.

Comment 1 Said Abou-Hallawa 2023-08-08 18:07:45 PDT

rdar://113305719

Comment 2 Said Abou-Hallawa 2023-08-08 18:17:58 PDT

Pull request: https://github.com/WebKit/WebKit/pull/16505