Implement API for accessing fonts installed locally on the system.

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

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "core/css/LocalFontFace.h"
+
+#include "bindings/core/v8/CallbackPromiseAdapter.h"
+#include "bindings/core/v8/ScriptPromiseResolver.h"
+#include "bindings/core/v8/ScriptState.h"
+#include "core/CSSValueKeywords.h"
+#include "core/css/FontFaceDescriptors.h"
+#include "core/css/parser/CSSParser.h"
+#include "core/dom/DOMArrayBuffer.h"
+#include "core/dom/DOMException.h"
+#include "core/dom/Document.h"
+#include "core/dom/ExceptionCode.h"
+#include "core/frame/UseCounter.h"
+#include "public/platform/Platform.h"
+#include "public/platform/modules/font_access/WebFontAccess.h"
+
+namespace blink {
+PassRefPtrWillBeRawPtr<LocalFontFace> LocalFontFace::createLocalFontFace(ExecutionContext* context, const AtomicString& family, const AtomicString& styleName, const AtomicString& fullName, StringOrArrayBufferOrArrayBufferView& source, const FontFaceDescriptors& descriptors)
+{
+    String sourceString = source.getAsString();
+    RefPtrWillBeRawPtr<LocalFontFace> fontFace = adoptRefWillBeNoop(new LocalFontFace(context, family, styleName, fullName, descriptors));
+
+    Document* document = toDocument(context);
+    CSSParserContext parserContext(*document, UseCounter::getFrom(document));
+    RefPtrWillBeRawPtr<CSSValue> src = CSSParser::parseFontFaceDescriptor(CSSPropertySrc, sourceString, parserContext);
+    if (!src || !src->isValueList())
+        fontFace->setError(DOMException::create(SyntaxError, "The source provided ('" + sourceString + "') could not be parsed as a value list."));
+
+    fontFace->initCSSFontFace(toDocument(context), src);
+    return fontFace.release();
+}
+
+class FontBinaryResult {
+    WTF_MAKE_NONCOPYABLE(FontBinaryResult);
+
+public:
+    using WebType = OwnPtr<WebData>;
+
+    static PassRefPtr<DOMArrayBuffer> take(ScriptPromiseResolver* resolver, PassOwnPtr<WebData> webBlob)
+    {
+        RefPtr<DOMArrayBuffer> domBuffer = DOMArrayBuffer::create(webBlob->data(), webBlob->size());
+        return domBuffer;
+    }
+
+private:
+    FontBinaryResult() = delete;
+};
+
+ScriptPromise LocalFontFace::binaryData(ScriptState* scriptState) const
+{
+    WebFontAccess* webfontaccess = Platform::current()->fontAccess();
+    if (!webfontaccess)
+        return ScriptPromise::rejectWithDOMException(scriptState, DOMException::create(NotSupportedError));
+    ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
+    ScriptPromise promise = resolver->promise();
+
+    webfontaccess->getFontWebData(family(), styleName(), new CallbackPromiseAdapter<FontBinaryResult, void>(resolver));
+    return promise;
+}
+
+LocalFontFace::LocalFontFace(ExecutionContext* context, const AtomicString& family, const AtomicString& styleName, const AtomicString& fullName, const FontFaceDescriptors& descriptor)
+    : FontFace(context, family, descriptor)
+    , m_style(styleName)
+    , m_fullName(fullName)
+{
+}
+
+} // namespace blink