Change saveLayer() semantics to take unfiltered bounds.
For optimizing saveLayer() offscreens, it is useful to know the
bounds of the primitive being drawn. Currently, the bounds passed to
saveLayer() are filtered, which makes it difficult to know the original
bounds of the primitive. This CL changes the semantics to accept
unfiltered bounds. This actually simplifies the callsites too. In
order to result in the correct pixels being produced, we then call
computeFastBounds() inside clipRectBounds().
The old behaviour is wrapped in #ifdef SK_SAVE_LAYER_BOUNDS_ARE_FILTERED,
until we can update Chrome's callsites (see
https://codereview.chromium.org/1316243002/).
This change will affect the following GMs:
testimagefilters: saveLayer bounds no longer cause clipping
imagefiltersbase: slight pixel diffs
resizeimagefilter: slight pixel diffs on the "high quality" test case
imagefilterscropexpand: displacement results are now correct
filterfastbounds: slight pixel diffs
matriximagefilter: slight pixel diffs
BUG=skia:3194 skia:4526
Review URL: https://codereview.chromium.org/1304883004
1 file changed