Chromium Compositor Tile Raster Transform Path Map
Blink28631 Okt 2025

Chromium Compositor Tile Raster Transform Path Map

The source provides an exhaustive technical mapping of how the Tile::raster_transform_ field is initialized and maintained within the Chromium compositor. It explains that this transform, which consists of a scale and an optional sub-pixel alignment translation, is set immutably when a new Tile object is constructed, copying the value from its owning PictureLayerTiling. The document traces the transformation value back to its origin, which is chosen by the PictureLayerImpl layer, often involving a calculation that determines a fractional pixel-alignment offset using helper utilities like CalculateRasterTranslation to ensure crisp rendering. Crucially, if the transform needs to change, the existing tiles are dropped, and a new tiling (and subsequently new tiles) is created carrying the updated transform, maintaining the constancy of the field on the tile itself.

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