Fix Google3 fonts.

src/ports/SkFontConfigInterface_direct_google3.cpp

+/*
+ * Copyright 2009 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/* migrated from chrome/src/skia/ext/SkFontHost_fontconfig_direct.cpp */
+
+#include "google_font_file_buffering.h"
+
+#include "SkFontConfigInterfaceDirect.h"
+#include "SkMutex.h"
+#include "SkStream.h"
+#include "SkString.h"
+#include "SkTypes.h"
+
+#include <fontconfig/fontconfig.h>
+
+// Loads fonts using GoogleFt2ReadFontFromMemory.
+class SkFontConfigInterfaceDirectGoogle3 : public SkFontConfigInterfaceDirect {
+public:
+    SkFontConfigInterfaceDirectGoogle3() {}
+    ~SkFontConfigInterfaceDirectGoogle3() override {}
+
+    SkStreamAsset* openStream(const FontIdentity&) override;
+protected:
+    // Override isValidPattern to return true if the font is in the cache.
+    bool isValidPattern(FcPattern* pattern) override;
+private:
+    typedef SkFontConfigInterfaceDirect INHERITED;
+};
+
+SkFontConfigInterface* SkFontConfigInterface::GetSingletonDirectInterface(SkBaseMutex* mutex) {

[bungeman-skia, 2015/11/24 21:56:36]

It would be nice if this were in

SkFontConfigInterface_direct_google3_factory.cpp

for consistency, but I'm not going to require that.

[dogben, 2015/11/30 17:15:31]

Done. Required adding a .h.

+    SkAutoMutexAcquire ac(mutex);
+    static SkFontConfigInterfaceDirectGoogle3* singleton = nullptr;
+    if (singleton == nullptr) {
+        singleton = new SkFontConfigInterfaceDirectGoogle3;
+    }
+    return singleton;
+}
+
+bool SkFontConfigInterfaceDirectGoogle3::isValidPattern(FcPattern* pattern) {
+#ifdef SK_FONT_CONFIG_ONLY_ALLOW_SCALABLE_FONTS
+    FcBool is_scalable;
+    if (FcPatternGetBool(pattern, FC_SCALABLE, 0, &is_scalable) != FcResultMatch
+        || !is_scalable) {
+        return false;
+    }
+#endif
+
+    const char* c_filename = INHERITED::GetName(pattern, FC_FILE);
+    if (!c_filename) {
+        return false;
+    }
+    // Check if this font has been pre-loaded into memory.
+    const char* unused;
+    if (GoogleFreeType::GoogleFt2ReadFontFromMemory(c_filename, &unused) >= 0) {
+        return true;
+    }
+    return this->INHERITED::valid_pattern(pattern);
+}
+
+SkStreamAsset* SkFontConfigInterfaceDirectGoogle3::openStream(const FontIdentity& identity) {
+    const char* c_filename = identity.fString.c_str();
+    // Read the system fonts from the fonts we've pre-loaded into memory.
+    const char* buffer;
+    int length = GoogleFreeType::GoogleFt2ReadFontFromMemory(
+        c_filename, &buffer);
+    if (length >= 0) return new SkMemoryStream(buffer, length);
+    return this->INHERITED::openStream(identity);
+}