Bug 1771822 - Remove the layers.low-precision-{buffer,resolution} prefs. r=tnikkel

These are no longer used.

Depends on D151796

Differential Revision: https://phabricator.services.mozilla.com/D151797

gfx/layers/apz/test/mochitest/test_group_checkerboarding.html

@@ -29,7 +29,6 @@
 
       var no_multiplier_prefs = [
         ...zoom_and_pan_prefs,
-        ["layers.low-precision-buffer", false],
         ["apz.x_skate_size_multiplier", "0.0"],
         ["apz.y_skate_size_multiplier", "0.0"],
         ["apz.x_stationary_size_multiplier", "0.0"],

layout/base/DisplayPortUtils.cpp

@@ -481,10 +481,7 @@ static bool GetDisplayPortImpl(nsIContent* aContent, nsRect* aResult,
 
 bool DisplayPortUtils::GetDisplayPort(nsIContent* aContent, nsRect* aResult,
                                       const DisplayPortOptions& aOptions) {
-  float multiplier = StaticPrefs::layers_low_precision_buffer()
-                         ? 1.0f / StaticPrefs::layers_low_precision_resolution()
-                         : 1.0f;
-  return GetDisplayPortImpl(aContent, aResult, multiplier, aOptions);
+  return GetDisplayPortImpl(aContent, aResult, 1.0f, aOptions);
 }
 
 bool DisplayPortUtils::HasDisplayPort(nsIContent* aContent) {

layout/base/crashtests/crashtests.list

@@ -398,7 +398,7 @@ load 836990-1.html
 load 840480.html
 load 842114.html
 load 847242.html
-skip-if(ThreadSanitizer) pref(layers.low-precision-buffer,false) load 852293.html
+skip-if(ThreadSanitizer) load 852293.html
 pref(layers.force-active,true) load 859526-1.html
 pref(layers.force-active,true) load 859630-1.html
 load 860579-1.html

layout/reftests/async-scrolling/reftest.list

@@ -77,16 +77,10 @@ fuzzy-if(Android,3-3,1-470) fuzzy-if(Android&&swgl&&isDebugBuild&&/^aarch64-gcc3
 fuzzy-if(Android,12-13,4-31) fuzzy-if(gtkWidget,16-27,14-32) fuzzy-if(cocoaWidget,13-16,20-44) skip-if(!asyncPan) == position-sticky-in-transformed-scrollframe-1.html position-sticky-in-transformed-scrollframe-ref.html # Bug 1604338
 fuzzy-if(Android,12-13,4-31) fuzzy-if(gtkWidget,16-27,14-32) fuzzy-if(cocoaWidget,13-16,20-44) skip-if(!asyncPan) == position-sticky-in-transformed-scrollframe-2.html position-sticky-in-transformed-scrollframe-ref.html # Bug 1604338
 
-# for the following tests, we want to disable the low-precision buffer
-# as it will expand the displayport beyond what the test specifies in
-# its reftest-displayport attributes, and interfere with where we expect
-# checkerboarding to occur
-defaults pref(layers.low-precision-buffer,false)
 skip-if(!asyncPan) == checkerboard-1.html checkerboard-1-ref.html
 skip-if(!asyncPan) == checkerboard-2.html checkerboard-2-ref.html
 skip-if(!asyncPan) == checkerboard-3.html checkerboard-3-ref.html
 skip-if(!asyncPan) == position-sticky-in-checkerboard-land-1.html position-sticky-in-checkerboard-land-1-ref.html
-defaults
 
 skip-if(!Android) pref(apz.allow_zooming,true) == position-fixed-async-zoom-1.html position-fixed-async-zoom-1-ref.html
 skip-if(!Android) pref(apz.allow_zooming,true) == position-fixed-async-zoom-2.html position-fixed-async-zoom-2-ref.html

layout/reftests/reftest-sanity/reftest.list

@@ -173,11 +173,7 @@ noautofuzz fails fuzzy-if(false,0-2,0-1) == fuzzy.html fuzzy-ref.html
 
 skip-if(!asyncPan||!browserIsRemote) == async-scroll-1a.html async-scroll-1-ref.html
 
-# Disable low-res painting for this test as it will cause more to
-# be drawn than we want.
-defaults pref(layers.low-precision-buffer,false)
 skip-if(!asyncPan||!browserIsRemote) != async-scroll-1b.html async-scroll-1-ref.html
-defaults
 
 skip-if(!asyncPan||!browserIsRemote) == async-scroll-1c.html async-scroll-1-ref.html
 

modules/libpref/init/StaticPrefList.yaml

@@ -7251,16 +7251,6 @@
   value: false
   mirror: always
 
-- name: layers.low-precision-buffer
-  type: RelaxedAtomicBool
-  value: false
-  mirror: always
-
-- name: layers.low-precision-resolution
-  type: AtomicFloat
-  value: 0.25f
-  mirror: always
-
 # Whether to animate simple opacity and transforms on the compositor.
 - name: layers.offmainthreadcomposition.async-animations
   type: bool