use font for settings

Bug: skia:
Change-Id: Ia1ebd888bf0f0ce9c0c6dfdceff92be59db02a85
Reviewed-on: https://skia-review.googlesource.com/c/171650
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>

src/core/SkFont.cpp

@@ -96,6 +96,10 @@ SkScalar SkFont::setupForAsPaths(SkPaint* paint) {
     fFlags = (fFlags & ~flagsToIgnore) | kSubpixel_PrivFlag;
     this->setHinting(kNo_SkFontHinting);
 
+    if (this->getEdging() == Edging::kSubpixelAntiAlias) {
+        this->setEdging(Edging::kAntiAlias);
+    }
+
     if (paint) {
         paint->setStyle(SkPaint::kFill_Style);
         paint->setPathEffect(nullptr);
@@ -379,9 +383,9 @@ SkFont SkFont::LEGACY_ExtractFromPaint(const SkPaint& paint) {
     Edging edging = Edging::kAlias;
     if (paint.isAntiAlias()) {
         edging = Edging::kAntiAlias;
-    }
-    if (paint.isLCDRenderText()) {
-        edging = Edging::kSubpixelAntiAlias;
+        if (paint.isLCDRenderText()) {
+            edging = Edging::kSubpixelAntiAlias;
+        }
     }
 
     SkFont font(sk_ref_sp(paint.getTypeface()), paint.getTextSize(), paint.getTextScaleX(),

src/core/SkScalerContext.cpp

@@ -854,18 +854,16 @@ static SkScalar sk_relax(SkScalar x) {
     return n / 1024.0f;
 }
 
-static SkMask::Format compute_mask_format(const SkPaint& paint) {
-    uint32_t flags = paint.getFlags();
-
-    // Antialiasing being disabled trumps all other settings.
-    if (!(flags & SkPaint::kAntiAlias_Flag)) {
-        return SkMask::kBW_Format;
-    }
-
-    if (flags & SkPaint::kLCDRenderText_Flag) {
-        return SkMask::kLCD16_Format;
+static SkMask::Format compute_mask_format(const SkFont& font) {
+    switch (font.getEdging()) {
+        case SkFont::Edging::kAlias:
+            return SkMask::kBW_Format;
+        case SkFont::Edging::kAntiAlias:
+            return SkMask::kA8_Format;
+        case SkFont::Edging::kSubpixelAntiAlias:
+            return SkMask::kLCD16_Format;
     }
-
+    SkASSERT(false);
     return SkMask::kA8_Format;
 }
 
@@ -976,7 +974,7 @@ void SkScalerContext::MakeRecAndEffects(const SkFont& font, const SkPaint& paint
         rec->fStrokeCap = 0;
     }
 
-    rec->fMaskFormat = SkToU8(compute_mask_format(paint));
+    rec->fMaskFormat = SkToU8(compute_mask_format(font));
 
     if (SkMask::kLCD16_Format == rec->fMaskFormat) {
         if (too_big_for_lcd(*rec, checkPost2x2)) {