[Impeller] Make dark text appear less emboldened

impeller/typographer/backends/skia/text_frame_skia.cc

@@ -29,6 +29,7 @@ static Font ToFont(const SkTextBlobRunIterator& run, Scalar scale) {
   metrics.point_size = font.getSize();
   metrics.embolden = font.isEmbolden();
   metrics.skewX = font.getSkewX();
+  metrics.scaleX = font.getScaleX();
 
   return Font{std::move(typeface), metrics};
 }

impeller/typographer/backends/skia/text_render_context_skia.cc

@@ -287,21 +287,21 @@ static void ConvertBitmapToSignedDistanceField(uint8_t* pixels,
 
 static void DrawGlyph(SkCanvas* canvas,
                       const FontGlyphPair& font_glyph,
-                      const Rect& location) {
+                      const Rect& location,
+                      bool has_color) {
   const auto& metrics = font_glyph.font.GetMetrics();
   const auto position = SkPoint::Make(location.origin.x / metrics.scale,
                                       location.origin.y / metrics.scale);
   SkGlyphID glyph_id = font_glyph.glyph.index;
 
   SkFont sk_font(
       TypefaceSkia::Cast(*font_glyph.font.GetTypeface()).GetSkiaTypeface(),
-      metrics.point_size);
+      metrics.point_size, metrics.scaleX, metrics.skewX);
   sk_font.setEdging(SkFont::Edging::kAntiAlias);
   sk_font.setHinting(SkFontHinting::kSlight);
   sk_font.setEmbolden(metrics.embolden);
-  sk_font.setSkewX(metrics.skewX);
 
-  auto glyph_color = SK_ColorWHITE;
+  auto glyph_color = has_color ? SK_ColorWHITE : SK_ColorBLACK;
 
   SkPaint glyph_paint;
   glyph_paint.setColor(glyph_color);
@@ -333,12 +333,14 @@ static bool UpdateAtlasBitmap(const GlyphAtlas& atlas,
     return false;
   }
 
+  bool has_color = atlas.GetType() == GlyphAtlas::Type::kColorBitmap;
+
   for (const auto& pair : new_pairs) {
     auto pos = atlas.FindFontGlyphPosition(pair);
     if (!pos.has_value()) {
       continue;
     }
-    DrawGlyph(canvas, pair, pos.value());
+    DrawGlyph(canvas, pair, pos.value(), has_color);
   }
   return true;
 }
@@ -373,11 +375,13 @@ static std::shared_ptr<SkBitmap> CreateAtlasBitmap(const GlyphAtlas& atlas,
     return nullptr;
   }
 
-  atlas.IterateGlyphs(
-      [canvas](const FontGlyphPair& font_glyph, const Rect& location) -> bool {
-        DrawGlyph(canvas, font_glyph, location);
-        return true;
-      });
+  bool has_color = atlas.GetType() == GlyphAtlas::Type::kColorBitmap;
+
+  atlas.IterateGlyphs([canvas, has_color](const FontGlyphPair& font_glyph,
+                                          const Rect& location) -> bool {
+    DrawGlyph(canvas, font_glyph, location, has_color);
+    return true;
+  });
 
   return bitmap;
 }

impeller/typographer/font.h

@@ -41,10 +41,11 @@ class Font : public Comparable<Font> {
     Scalar point_size = 12.0f;
     bool embolden = false;
     Scalar skewX = 0.0f;
+    Scalar scaleX = 1.0f;
 
     constexpr bool operator==(const Metrics& o) const {
       return scale == o.scale && point_size == o.point_size &&
-             embolden == o.embolden && skewX == o.skewX;
+             embolden == o.embolden && skewX == o.skewX && scaleX == o.scaleX;
     }
   };