Bug 1730772: Do not use GDI classic rendering on transparent DrawTargets (mainly Canvas). r=jfkthame,jrmuizel

Differential Revision: https://phabricator.services.mozilla.com/D125745

gfx/thebes/gfxDWriteFonts.cpp

@@ -752,7 +752,8 @@ already_AddRefed<ScaledFont> gfxDWriteFont::GetScaledFont(
   }
   if (!mAzureScaledFont) {
     gfxDWriteFontEntry* fe = static_cast<gfxDWriteFontEntry*>(mFontEntry.get());
-    bool forceGDI = GetForceGDIClassic();
+    bool forceGDI =
+        aTarget->GetFormat() == SurfaceFormat::B8G8R8X8 && GetForceGDIClassic();
     bool useEmbeddedBitmap =
         (gfxVars::SystemTextRenderingMode() == DWRITE_RENDERING_MODE_DEFAULT ||
          forceGDI) &&

testing/web-platform/meta/css/css-ui/text-overflow-027.html.ini

@@ -1,3 +0,0 @@
-[text-overflow-027.html]
-  expected:
-    if (os == "win"): FAIL

testing/web-platform/meta/css/selectors/first-line-bidi-001.html.ini

@@ -1,4 +1,4 @@
 [first-line-bidi-001.html]
   fuzzy:
     if (os == "linux"): maxDifference=63;totalPixels=0-26
-    if (os == "win"): maxDifference=63;totalPixels=0-44
+    if (os == "win"): maxDifference=137;totalPixels=0-84

testing/web-platform/meta/css/selectors/first-line-bidi-002.html.ini

@@ -1,4 +1,4 @@
 [first-line-bidi-002.html]
   fuzzy:
     if (os == "mac"): maxDifference=99-120;totalPixels=0-18
-    if (os == "win"): maxDifference=13-29;totalPixels=0-18
+    if (os == "win"): maxDifference=143;totalPixels=0-41