diff options
| -rw-r--r-- | gfx/thebes/gfxPrefs.h | 1 | ||||
| -rw-r--r-- | layout/base/nsDisplayList.cpp | 5 | ||||
| -rw-r--r-- | modules/libpref/init/all.js | 6 |
3 files changed, 12 insertions, 0 deletions
diff --git a/gfx/thebes/gfxPrefs.h b/gfx/thebes/gfxPrefs.h index 71485ff22..359a258c7 100644 --- a/gfx/thebes/gfxPrefs.h +++ b/gfx/thebes/gfxPrefs.h @@ -436,6 +436,7 @@ private: 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.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(Live, "image.mem.discardable", ImageMemDiscardable, bool, false); DECL_GFX_PREF(Once, "image.mem.surfacecache.discard_factor", ImageMemSurfaceCacheDiscardFactor, uint32_t, 1); diff --git a/layout/base/nsDisplayList.cpp b/layout/base/nsDisplayList.cpp index 8035269e3..cb55bb2da 100644 --- a/layout/base/nsDisplayList.cpp +++ b/layout/base/nsDisplayList.cpp @@ -3513,6 +3513,11 @@ nsDisplayImageContainer::CanOptimizeToImageLayer(LayerManager* aManager, 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 LayoutDeviceRect destRect = LayoutDeviceRect::FromAppUnits(GetDestRect(), factor); diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js index beab06aff..1b2793ed3 100644 --- a/modules/libpref/init/all.js +++ b/modules/libpref/init/all.js @@ -4346,6 +4346,12 @@ pref("image.http.accept", "image/webp,image/png,image/*;q=0.8,*/*;q=0.5"); // disable. 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 // |