Move SkFontMgr and SkFontStyle impls to own cpp.

SkFontMgr and SkFontStyle implementations are currently burried in the
old SkFontHost.cpp file. Move these implementations to their own file
so that the implementations are easier to find, and to make clearer that
SkFontHost.cpp needs to be removed.

Review URL: https://codereview.chromium.org/799533004

1 files changed, 157 insertions, 0 deletions

diff --git a/src/core/SkFontMgr.cpp b/src/core/SkFontMgr.cpp
new file mode 100644
index 0000000000..ca29e293ef
--- /dev/null
+++ b/src/core/SkFontMgr.cpp
@@ -0,0 +1,157 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkFontMgr.h"
+#include "SkLazyPtr.h"
+#include "SkTypes.h"
+
+class SkFontStyle;
+class SkStream;
+class SkTypeface;
+
+class SkEmptyFontStyleSet : public SkFontStyleSet {
+public:
+    int count() SK_OVERRIDE { return 0; }
+    void getStyle(int, SkFontStyle*, SkString*) SK_OVERRIDE {
+        SkDEBUGFAIL("SkFontStyleSet::getStyle called on empty set");
+    }
+    SkTypeface* createTypeface(int index) SK_OVERRIDE {
+        SkDEBUGFAIL("SkFontStyleSet::createTypeface called on empty set");
+        return NULL;
+    }
+    SkTypeface* matchStyle(const SkFontStyle&) SK_OVERRIDE {
+        return NULL;
+    }
+};
+
+SkFontStyleSet* SkFontStyleSet::CreateEmpty() {
+    return SkNEW(SkEmptyFontStyleSet);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+class SkEmptyFontMgr : public SkFontMgr {
+protected:
+    int onCountFamilies() const SK_OVERRIDE {
+        return 0;
+    }
+    void onGetFamilyName(int index, SkString* familyName) const SK_OVERRIDE {
+        SkDEBUGFAIL("onGetFamilyName called with bad index");
+    }
+    SkFontStyleSet* onCreateStyleSet(int index) const SK_OVERRIDE {
+        SkDEBUGFAIL("onCreateStyleSet called with bad index");
+        return NULL;
+    }
+    SkFontStyleSet* onMatchFamily(const char[]) const SK_OVERRIDE {
+        return SkFontStyleSet::CreateEmpty();
+    }
+
+    virtual SkTypeface* onMatchFamilyStyle(const char[],
+                                           const SkFontStyle&) const SK_OVERRIDE {
+        return NULL;
+    }
+    virtual SkTypeface* onMatchFamilyStyleCharacter(const char familyName[],
+                                                    const SkFontStyle& style,
+                                                    const char* bcp47[],
+                                                    int bcp47Count,
+                                                    SkUnichar character) const SK_OVERRIDE {
+        return NULL;
+    }
+    virtual SkTypeface* onMatchFaceStyle(const SkTypeface*,
+                                         const SkFontStyle&) const SK_OVERRIDE {
+        return NULL;
+    }
+    SkTypeface* onCreateFromData(SkData*, int) const SK_OVERRIDE {
+        return NULL;
+    }
+    SkTypeface* onCreateFromStream(SkStream*, int) const SK_OVERRIDE {
+        return NULL;
+    }
+    SkTypeface* onCreateFromFile(const char[], int) const SK_OVERRIDE {
+        return NULL;
+    }
+    SkTypeface* onLegacyCreateTypeface(const char [], unsigned) const SK_OVERRIDE {
+        return NULL;
+    }
+};
+
+static SkFontStyleSet* emptyOnNull(SkFontStyleSet* fsset) {
+    if (NULL == fsset) {
+        fsset = SkFontStyleSet::CreateEmpty();
+    }
+    return fsset;
+}
+
+int SkFontMgr::countFamilies() const {
+    return this->onCountFamilies();
+}
+
+void SkFontMgr::getFamilyName(int index, SkString* familyName) const {
+    this->onGetFamilyName(index, familyName);
+}
+
+SkFontStyleSet* SkFontMgr::createStyleSet(int index) const {
+    return emptyOnNull(this->onCreateStyleSet(index));
+}
+
+SkFontStyleSet* SkFontMgr::matchFamily(const char familyName[]) const {
+    return emptyOnNull(this->onMatchFamily(familyName));
+}
+
+SkTypeface* SkFontMgr::matchFamilyStyle(const char familyName[],
+                                        const SkFontStyle& fs) const {
+    return this->onMatchFamilyStyle(familyName, fs);
+}
+
+SkTypeface* SkFontMgr::matchFamilyStyleCharacter(const char familyName[], const SkFontStyle& style,
+                                                 const char* bcp47[], int bcp47Count,
+                                                 SkUnichar character) const {
+    return this->onMatchFamilyStyleCharacter(familyName, style, bcp47, bcp47Count, character);
+}
+
+SkTypeface* SkFontMgr::matchFaceStyle(const SkTypeface* face,
+                                      const SkFontStyle& fs) const {
+    return this->onMatchFaceStyle(face, fs);
+}
+
+SkTypeface* SkFontMgr::createFromData(SkData* data, int ttcIndex) const {
+    if (NULL == data) {
+        return NULL;
+    }
+    return this->onCreateFromData(data, ttcIndex);
+}
+
+SkTypeface* SkFontMgr::createFromStream(SkStream* stream, int ttcIndex) const {
+    if (NULL == stream) {
+        return NULL;
+    }
+    return this->onCreateFromStream(stream, ttcIndex);
+}
+
+SkTypeface* SkFontMgr::createFromFile(const char path[], int ttcIndex) const {
+    if (NULL == path) {
+        return NULL;
+    }
+    return this->onCreateFromFile(path, ttcIndex);
+}
+
+SkTypeface* SkFontMgr::legacyCreateTypeface(const char familyName[],
+                                            unsigned styleBits) const {
+    return this->onLegacyCreateTypeface(familyName, styleBits);
+}
+
+// As a template argument this must have external linkage.
+SkFontMgr* sk_fontmgr_create_default() {
+    SkFontMgr* fm = SkFontMgr::Factory();
+    return fm ? fm : SkNEW(SkEmptyFontMgr);
+}
+
+SK_DECLARE_STATIC_LAZY_PTR(SkFontMgr, singleton, sk_fontmgr_create_default);
+
+SkFontMgr* SkFontMgr::RefDefault() {
+    return SkRef(singleton.get());
+}