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Add pref to control CanOptimizeToImageLayer for large downscale factors.

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This resolves #626
This commit is contained in:
wolfbeast 2018-07-14 07:45:06 +02:00 • committed by Roy Tam
commit ca5c2ba100
3 changed files with 12 additions and 0 deletions
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1
gfx/thebes/gfxPrefs.h
View file

@ -436,6 +436,7 @@ private:
DECL_GFX_PREF(Live, "image.decode-immediately.enabled", ImageDecodeImmediatelyEnabled, bool, false); DECL_GFX_PREF(Live, "image.decode-immediately.enabled", ImageDecodeImmediatelyEnabled, bool, false);
DECL_GFX_PREF(Live, "image.downscale-during-decode.enabled", ImageDownscaleDuringDecodeEnabled, bool, true); DECL_GFX_PREF(Live, "image.downscale-during-decode.enabled", ImageDownscaleDuringDecodeEnabled, bool, true);
DECL_GFX_PREF(Live, "image.infer-src-animation.threshold-ms", ImageInferSrcAnimationThresholdMS, uint32_t, 2000); DECL_GFX_PREF(Live, "image.infer-src-animation.threshold-ms", ImageInferSrcAnimationThresholdMS, uint32_t, 2000);
DECL_GFX_PREF(Once, "image.layerize.always", ImageLayerizeAlways, bool, false);
DECL_GFX_PREF(Once, "image.mem.decode_bytes_at_a_time", ImageMemDecodeBytesAtATime, uint32_t, 200000); DECL_GFX_PREF(Once, "image.mem.decode_bytes_at_a_time", ImageMemDecodeBytesAtATime, uint32_t, 200000);
DECL_GFX_PREF(Live, "image.mem.discardable", ImageMemDiscardable, bool, false); DECL_GFX_PREF(Live, "image.mem.discardable", ImageMemDiscardable, bool, false);
DECL_GFX_PREF(Once, "image.mem.surfacecache.discard_factor", ImageMemSurfaceCacheDiscardFactor, uint32_t, 1); DECL_GFX_PREF(Once, "image.mem.surfacecache.discard_factor", ImageMemSurfaceCacheDiscardFactor, uint32_t, 1);

5
layout/base/nsDisplayList.cpp
View file

@ -3513,6 +3513,11 @@ nsDisplayImageContainer::CanOptimizeToImageLayer(LayerManager* aManager,
return false; return false;
} }
if (gfxPrefs::ImageLayerizeAlways()) {
// If the user decides to trade off quality for performance, so be it!
return true;
}
const int32_t factor = mFrame->PresContext()->AppUnitsPerDevPixel(); const int32_t factor = mFrame->PresContext()->AppUnitsPerDevPixel();
const LayoutDeviceRect destRect = const LayoutDeviceRect destRect =
LayoutDeviceRect::FromAppUnits(GetDestRect(), factor); LayoutDeviceRect::FromAppUnits(GetDestRect(), factor);

6
modules/libpref/init/all.js
View file

@ -4354,6 +4354,12 @@ pref("image.http.accept", "image/webp,image/png,image/*;q=0.8,*/*;q=0.5");
// disable. // disable.
pref("image.infer-src-animation.threshold-ms", 2000); pref("image.infer-src-animation.threshold-ms", 2000);
// Whether to always optimize to image layers. Setting this to true will increase
// performance of downscaled large images at the expense of visual quality,
// because we can't use HQ downscaling in image layers.
// Aliasing may occur past downscaling beyond 34% in that case.
pref("image.layerize.always", false);
// //
// Image memory management prefs // Image memory management prefs
// //