Bug 1839614 - patch 2 - Move the browser.display.auto_quality_min_font_size pref into StaticPrefs. r=gfx-reviewers,lsalzman

No change in behavior here; this is to prepare for offscreen-canvas workers
to be able to access the pref (following patch).

Depends on D181636

Differential Revision: https://phabricator.services.mozilla.com/D181637

layout/base/nsLayoutUtils.cpp

@@ -83,6 +83,7 @@
 #include "mozilla/ServoStyleSet.h"
 #include "mozilla/ServoStyleSetInlines.h"
 #include "mozilla/StaticPrefs_apz.h"
+#include "mozilla/StaticPrefs_browser.h"
 #include "mozilla/StaticPrefs_dom.h"
 #include "mozilla/StaticPrefs_font.h"
 #include "mozilla/StaticPrefs_general.h"
@@ -7007,8 +7008,10 @@ nsIFrame* nsLayoutUtils::GetReferenceFrame(nsIFrame* aFrame) {
       result |= gfx::ShapedTextFlags::TEXT_OPTIMIZE_SPEED;
       break;
     case StyleTextRendering::Auto:
-      if (aPresContext && aStyleFont->mFont.size.ToCSSPixels() <
-                              aPresContext->GetAutoQualityMinFontSize()) {
+      if (aPresContext &&
+          aStyleFont->mFont.size.ToCSSPixels() <
+              aPresContext->DevPixelsToFloatCSSPixels(
+                  StaticPrefs::browser_display_auto_quality_min_font_size())) {
         result |= gfx::ShapedTextFlags::TEXT_OPTIMIZE_SPEED;
       }
       break;

layout/base/nsPresContext.cpp

@@ -237,7 +237,6 @@ nsPresContext::nsPresContext(dom::Document* aDocument, nsPresContextType aType)
       mFullZoom(1.0),
       mLastFontInflationScreenSize(gfxSize(-1.0, -1.0)),
       mCurAppUnitsPerDevPixel(0),
-      mAutoQualityMinFontSizePixelsPref(0),
       mDynamicToolbarMaxHeight(0),
       mDynamicToolbarHeight(0),
       mPageSize(-1, -1),
@@ -424,9 +423,6 @@ void nsPresContext::GetUserPreferences() {
     return;
   }
 
-  mAutoQualityMinFontSizePixelsPref =
-      Preferences::GetInt("browser.display.auto_quality_min_font_size");
-
   PreferenceSheet::EnsureInitialized();
 
   mSendAfterPaintToContent = Preferences::GetBool(

layout/base/nsPresContext.h

@@ -566,10 +566,6 @@ class nsPresContext : public nsISupports, public mozilla::SupportsWeakPtr {
    */
   void SetColorSchemeOverride(mozilla::dom::PrefersColorSchemeOverride);
 
-  mozilla::CSSCoord GetAutoQualityMinFontSize() const {
-    return DevPixelsToFloatCSSPixels(mAutoQualityMinFontSizePixelsPref);
-  }
-
   /**
    * Return the device's screen size in inches, for font size
    * inflation.

modules/libpref/init/StaticPrefList.yaml

@@ -1133,6 +1133,12 @@
   value: 32
   mirror: always
 
+# Min font device pixel size at which to turn on high quality.
+- name: browser.display.auto_quality_min_font_size
+  type: RelaxedAtomicUint32
+  value: 20
+  mirror: always
+
 - name: browser.display.background_color
   type: String
   value: "#FFFFFF"

modules/libpref/init/all.js

@@ -168,9 +168,6 @@ pref("dom.text-recognition.enabled", true);
 // of content viewers to cache based on the amount of available memory.
 pref("browser.sessionhistory.max_total_viewers", -1);
 
-// min font device pixel size at which to turn on high quality
-pref("browser.display.auto_quality_min_font_size", 20);
-
 // See http://whatwg.org/specs/web-apps/current-work/#ping
 pref("browser.send_pings", false);
 pref("browser.send_pings.max_per_link", 1);           // limit the number of pings that are sent per link click