Implement API for accessing fonts installed locally on the system.

third_party/WebKit/Source/core/css/FontFaceSet.cpp

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 #include "core/css/FontFaceSet.h"
 
+#include "bindings/core/v8/CallbackPromiseAdapter.h"
 #include "bindings/core/v8/Dictionary.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "core/css/CSSFontSelector.h"
 #include "core/css/CSSSegmentedFontFace.h"
 #include "core/css/FontFaceCache.h"
+#include "core/css/FontFaceDescriptors.h"
 #include "core/css/FontFaceSetLoadEvent.h"
+#include "core/css/LocalFontFace.h"
 #include "core/css/StylePropertySet.h"
 #include "core/css/parser/CSSParser.h"
 #include "core/css/resolver/StyleResolver.h"
 #include "core/dom/Document.h"
 #include "core/dom/StyleEngine.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/style/StyleInheritedData.h"
 #include "public/platform/Platform.h"
+#include "public/platform/modules/font_access/WebFontAccess.h"
+#include "public/platform/modules/font_access/WebFontAccessDescription.h"
 
 namespace blink {
 
 static const int defaultFontSize = 10;
 static const char defaultFontFamily[] = "sans-serif";
 
 class LoadFontPromiseResolver final : public FontFace::LoadFontCallback {
 public:
     static PassRefPtrWillBeRawPtr<LoadFontPromiseResolver> create(FontFaceArray faces, ScriptState* scriptState)
     {
@@ skipping 473 matching lines @@
 }
 
 bool FontFaceSet::IterationSource::next(ScriptState*, RefPtrWillBeMember<FontFace>& key, RefPtrWillBeMember<FontFace>& value, ExceptionState&)
 {
     if (m_fontFaces.size() <= m_index)
         return false;
     key = value = m_fontFaces[m_index++];
     return true;
 }
 
+class FontAccessDescriptionCallback : public FontAccessCallbacks {
+public:
+    FontAccessDescriptionCallback(ScriptPromiseResolver* resolver, ScriptState* scriptState)
+        : m_resolver(resolver)
+        , m_executionContext(scriptState->executionContext())
+    {
+    }
+
+    void onSuccess(WebPassOwnPtr<WebVector<WebFontAccessDescription*>> description) override

[esprehn, 2016/01/26 20:26:45]

who own's the description objects? Why isn't this a Vector of OwnPtr?

[Daniel Nishi, 2016/01/26 23:49:26]

I think the WebVector owns the Description objects. Looking over it, I'm not
100% sure that is true, so I've changed it to be a vector of Descriptions,
rather than pointers to descriptions.

It isn't a Vector of OwnPtr because this occurs over the Content/Blink boundary.

+    {
+        WillBeHeapVector<RefPtrWillBeMember<FontFace>> fonts;
+        OwnPtr<WebVector<WebFontAccessDescription*>> webFonts = description.release();
+        blink::FontFaceDescriptors faceDesc;

[esprehn, 2016/01/26 20:26:45]

don't abbreviate

[Daniel Nishi, 2016/01/26 23:49:26]

Done.

+        for (const auto webFont : *webFonts) {
+            StringOrArrayBufferOrArrayBufferView cssString;
+            StringBuilder result;
+            result.append("local('");
+            result.append(webFont->fullName);
+            result.append(')');
+            cssString.setString(result.toString());
+            RefPtrWillBeMember<LocalFontFace> ff = LocalFontFace::createLocalFontFace(m_executionContext.get(), webFont->family, webFont->style, webFont->fullName, cssString, faceDesc);
+            fonts.append(ff);
+        }
+
+        m_resolver->resolve(fonts);
+    }
+    void onError() override
+    {
+    }
+
+private:
+    Persistent<ScriptPromiseResolver> m_resolver;
+    RefPtrWillBePersistent<ExecutionContext> m_executionContext;
+};
+
+ScriptPromise FontFaceSet::systemFonts(ScriptState* scriptState)
+{
+    WebFontAccess* webfontaccess = Platform::current()->fontAccess();
+    if (!webfontaccess)
+        return ScriptPromise::rejectWithDOMException(scriptState, DOMException::create(NotSupportedError));
+
+    ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
+    ScriptPromise promise = resolver->promise();
+
+    webfontaccess->getFonts(new FontAccessDescriptionCallback(resolver, scriptState));
+    return promise;
+}
+
 DEFINE_TRACE(FontFaceSet)
 {
 #if ENABLE(OILPAN)
     visitor->trace(m_ready);
     visitor->trace(m_loadingFonts);
     visitor->trace(m_loadedFonts);
     visitor->trace(m_failedFonts);
     visitor->trace(m_nonCSSConnectedFaces);
     visitor->trace(m_asyncRunner);
     HeapSupplement<Document>::trace(visitor);
 #endif
     EventTargetWithInlineData::trace(visitor);
     ActiveDOMObject::trace(visitor);
 }
 
 } // namespace blink