ScreenshotLayer overrides SingleTileLayer's draw function to simplify the
drawing process. Unfortunately, this doesn't respect the layer mask, and can
cause the layer to appear incorrectly stretched.
Change the screenshot process so that whole-page screenshots pass parameters
that are pre-scaled (to avoid mismatches when the viewport changes), and set
the page size on the ScreenShotLayer so it draws in the correct place.
This also alters the masking slightly to avoid visible seams around masks in
the centre of the page, and to avoid unnnecessary drawing at the edges of the
page.
This change fixes the frame-rate issues with the screenshot layer, as it
removes unnecessary over-draw.
Alter GeckoSoftwareLayerClient.beginDrawing so that it can return a rectangle
of the buffer that it's interested in. Gecko then uses this to clip the dirty
region, which often saves on unnecessary drawing during flings.
This backs out changes d8fc13006aa4, ddde7a49f6f7, 34b1cc9454d2 and
8919c54229e1, leaving in some initialisation fixes that were introduced when
rebasing.
This work may be re-applied at a later date.
Instead of tying the tile-buffer in MultiTileLayer directly to the back-buffer
of the page, make sure rendering is always aligned to the tile grid and use
tiles on-demand. This makes better use of tiles when panning/zooming, and opens
up the route for further optimisations.
Instead of tying the tile-buffer in MultiTileLayer directly to the back-buffer
of the page, make sure rendering is always aligned to the tile grid and use
tiles on-demand. This makes better use of tiles when panning/zooming, and opens
up the route for further optimisations.
Instead of tying the tile-buffer in MultiTileLayer directly to the back-buffer
of the page, make sure rendering is always aligned to the tile grid and use
tiles on-demand. This makes better use of tiles when panning/zooming, and opens
up the route for further optimisations.
Earlier patches mistakenly removed the redraw hint. This restores it, and
alters its behaviour to work correctly with regards to the viewport. This
should help mitigate some checker-boarding and performance issues when panning
and zooming.
This patch reinstates pinch-zooming and adds CSS re-scaling so that after
zooming, the page is rendered at the scaled resolution and you get clear text.
