[webkit-changes] [WebKit/WebKit] 42d626: ImageQualityController thrashes a timer

[Simon Fraser]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 42d62602b5645e08527e41e02f7752c3c73aa373
      https://github.com/WebKit/WebKit/commit/42d62602b5645e08527e41e02f7752c3c73aa373
  Author: Simon Fraser <simon.fraser at apple.com>
  Date:   2024-07-11 (Thu, 11 Jul 2024)

  Changed paths:
    M Source/WebCore/rendering/ImageQualityController.cpp
    M Source/WebCore/rendering/ImageQualityController.h

  Log Message:
  -----------
  ImageQualityController thrashes a timer
https://bugs.webkit.org/show_bug.cgi?id=276347
rdar://131352675

Reviewed by Tim Horton.

For content with lots of images, `ImageQualityController::chooseInterpolationQuality()` is called each time
an image paints and potentially restarts a timer. Use a DeferrableOneShotTimer instead, which is designed
for this kind of use case.

Also do some other minor optimizations; only call `context.getCTM().isIdentityOrTranslationOrFlipped()` if we need to,
and only set a new value in the hash tables if the size changed.

* Source/WebCore/rendering/ImageQualityController.cpp:
(WebCore::ImageQualityController::ImageQualityController):
(WebCore::ImageQualityController::restartTimer):
* Source/WebCore/rendering/ImageQualityController.h:

Canonical link: https://commits.webkit.org/280872@main



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