I would highly advise against setting minimum-scale to 1.0. 0.2 would be
better. I use this:
<meta name="viewport" content="width=device-width, initial-scale=.2,
maximum-scale=.2, user-scalable=0">
I may be mis-understanding/mis-remembering, but: setting minimum-scale
to 1.0 means that a 1000 pixel object (in CSS terms) will actually take
up devicePixelRatio times this many pixels in texture memory. A
1920x1080 element with a devicePixelRatio of 3 will have 9 times as many
renderable pixels as logical pixels and thus take 9 times more texture
space! So much more used texture render space means many weird Chromium
memory bugs and extra GPU-CPU cross-communication delays.
I had absolutely awful performance in my jigsaw game until I realized
that I just needed to set minimum-scale to much less than 1.
FYI, not sure how many of these are relevant or actually do anything,
but here is my xwalk-command-line file:
xwalk --enable-remote-debugging
--disable-gesture-requirement-for-media-playback --ignore-gpu-blacklist
--use-mobile-user-agent --enable-begin-frame-scheduling
--enable-fixed-position-compositing --enable-threaded-compositing
--enable-accelerated-overflow-scroll --enable-overlay-fullscreen-video
--in-process-gpu --disable-gpu-shader-disk-cache --enable-viewport
--enable-viewport-meta --main-frame-resizes-are-orientation-changes
--disable-composited-antialiasing --ui-prioritize-in-gpu-process
--enable-delegated-renderer --profiler-timing=0 --prerender=auto
--disable-gpu-watchdog --supports-dual-gpus=true
--gpu-driver-bug-workarounds=1,8,43,45 --canvas-msaa-sample-count=0
--disable-low-res-tiling --disable-overlay-scrollbars
On 2015-03-09 21:24, Miao, Qiankun wrote:
Chromium enabled gpu-rasterization since chrome 37, and CrossWalk
merged this change since V9. Please refer:
http://www.chromium.org/developers/design-documents/chromium-graphics/how-to-get-gpu-rasterization
[1] . You can add “minimum-scale=1” to the meta viewport to enable
gpu-rasterization: e.g. <meta name="viewport"
content="width=device-width, minimum-scale=1.0">.
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