CoreText COLR/CPAL fallback to FreeType

Fallback to FreeType on Mac OS < 10.13 as there is no support for
COLR/CPAL layered fonts in CoreText before this version.

Bug: 882844
Change-Id: I80ed16d1e6e23ee36dd5ad179e7712a53381e7c4
Reviewed-on: https://chromium-review.googlesource.com/1235995
Commit-Queue: Emil A Eklund <eae@chromium.org>
Reviewed-by: Emil A Eklund <eae@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592857}

third_party/blink/renderer/platform/BUILD.gn

@@ -659,8 +659,8 @@ jumbo_component("platform") {
     "fonts/linux/font_cache_linux.cc",
     "fonts/linux/font_unique_name_lookup_linux.cc",
     "fonts/linux/font_unique_name_lookup_linux.h",
-    "fonts/mac/core_text_variations_support.cc",
-    "fonts/mac/core_text_variations_support.h",
+    "fonts/mac/core_text_font_format_support.cc",
+    "fonts/mac/core_text_font_format_support.h",
     "fonts/mac/font_cache_mac.mm",
     "fonts/mac/font_family_matcher_mac.h",
     "fonts/mac/font_family_matcher_mac.mm",

third_party/blink/renderer/platform/fonts/mac/core_text_variations_support.cc → third_party/blink/renderer/platform/fonts/mac/core_text_font_format_support.cc

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "third_party/blink/renderer/platform/fonts/mac/core_text_variations_support.h"
+#include "third_party/blink/renderer/platform/fonts/mac/core_text_font_format_support.h"
 
 #include <CoreText/CoreText.h>
 
@@ -12,9 +12,18 @@ namespace blink {
 // to have access to this value when building against the 10.10 SDK in our
 // standard Chrome build configuration.
 static const long kBlinkLocalCTVersionNumber10_12 = 0x00090000;
+static const long kBlinkLocalCTVersionNumber10_13 = 0x000A0000;
 
 bool CoreTextVersionSupportsVariations() {
   return &CTGetCoreTextVersion &&
          CTGetCoreTextVersion() >= kBlinkLocalCTVersionNumber10_12;
 }
+
+// CoreText versions below 10.13 display COLR cpal as black/foreground-color
+// glyphs and do not interpret color glyph layers correctly.
+bool CoreTextVersionSupportsColrCpal() {
+  return &CTGetCoreTextVersion &&
+         CTGetCoreTextVersion() >= kBlinkLocalCTVersionNumber10_13;
 }
+
+}  // namespace blink

third_party/blink/renderer/platform/fonts/mac/core_text_variations_support.h → third_party/blink/renderer/platform/fonts/mac/core_text_font_format_support.h

@@ -2,12 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_MAC_CORE_TEXT_VARIATIONS_SUPPORT_H_
-#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_MAC_CORE_TEXT_VARIATIONS_SUPPORT_H_
+#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_MAC_CORE_TEXT_FONT_FORMAT_SUPPORT_H_
+#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_MAC_CORE_TEXT_FONT_FORMAT_SUPPORT_H_
 
 namespace blink {
 
 bool CoreTextVersionSupportsVariations();
-}
+bool CoreTextVersionSupportsColrCpal();
+}  // namespace blink
 
-#endif
+#endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_MAC_CORE_TEXT_FONT_FORMAT_SUPPORT_H_

third_party/blink/renderer/platform/fonts/web_font_typeface_factory.cc

@@ -20,7 +20,7 @@
 #endif
 
 #if defined(OS_MACOSX)
-#include "third_party/blink/renderer/platform/fonts/mac/core_text_variations_support.h"
+#include "third_party/blink/renderer/platform/fonts/mac/core_text_font_format_support.h"
 #endif
 
 namespace blink {
@@ -129,6 +129,10 @@ sk_sp<SkFontMgr> WebFontTypefaceFactory::FontManagerForColrCpal() {
 #if defined(OS_WIN)
   if (!blink::DWriteRasterizerSupport::IsDWriteFactory2Available())
     return FreeTypeFontManager();
+#endif
+#if defined(OS_MACOSX)
+  if (!CoreTextVersionSupportsColrCpal())
+    return FreeTypeFontManager();
 #endif
   // TODO(https://crbug.com/882844): Check Mac OS version and use the FreeType
   // font manager accordingly.