Add nativeFonts flag to Viewer.

This moves DMFontMgr and several related files which are tightly related
to fonts into tools/fonts, moves some flags around to prevent
duplication, and adds the nativeFonts handling to Viewer.

Change-Id: Id1bdad708a6b74319ac5ac9adfe21025db4ca0b2
Reviewed-on: https://skia-review.googlesource.com/108904
Commit-Queue: Ben Wagner <bungeman@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>

1 files changed, 147 insertions, 0 deletions

diff --git a/tools/fonts/SkTestFontMgr.cpp b/tools/fonts/SkTestFontMgr.cpp
new file mode 100644
index 0000000000..3b5d1589f2
--- /dev/null
+++ b/tools/fonts/SkTestFontMgr.cpp
@@ -0,0 +1,147 @@
+/*
+ * Copyright 2017 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkFontDescriptor.h"
+#include "SkTestFontMgr.h"
+#include "sk_tool_utils.h"
+
+namespace {
+
+static constexpr const char* kFamilyNames[] = {
+    "Toy Liberation Sans",
+    "Toy Liberation Serif",
+    "Toy Liberation Mono",
+};
+
+class FontStyleSet final : public SkFontStyleSet {
+public:
+    explicit FontStyleSet(int familyIndex) {
+        using sk_tool_utils::create_portable_typeface;
+        const char* familyName = kFamilyNames[familyIndex];
+
+        fTypefaces[0] = create_portable_typeface(familyName, SkFontStyle::Normal());
+        fTypefaces[1] = create_portable_typeface(familyName, SkFontStyle::Bold());
+        fTypefaces[2] = create_portable_typeface(familyName, SkFontStyle::Italic());
+        fTypefaces[3] = create_portable_typeface(familyName, SkFontStyle::BoldItalic());
+    }
+
+    int count() override { return 4; }
+
+    void getStyle(int index, SkFontStyle* style, SkString* name) override {
+        switch (index) {
+            default:
+            case  0: if (style) { *style = SkFontStyle::Normal(); }
+                     if (name)  { *name = "Normal"; }
+                     break;
+            case  1: if (style) { *style = SkFontStyle::Bold(); }
+                     if (name)  { *name = "Bold"; }
+                     break;
+            case  2: if (style) { *style = SkFontStyle::Italic(); }
+                     if (name)  { *name = "Italic"; }
+                     break;
+            case  3: if (style) { *style = SkFontStyle::BoldItalic(); }
+                     if (name)  { *name = "BoldItalic"; }
+                     break;
+        }
+    }
+
+    SkTypeface* createTypeface(int index) override {
+        return SkRef(fTypefaces[index].get());
+    }
+
+    SkTypeface* matchStyle(const SkFontStyle& pattern) override {
+        return this->matchStyleCSS3(pattern);
+    }
+
+private:
+    sk_sp<SkTypeface> fTypefaces[4];
+};
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ //
+
+class FontMgr final : public SkFontMgr {
+public:
+    FontMgr() {
+        fFamilies[0] = sk_make_sp<FontStyleSet>(0);
+        fFamilies[1] = sk_make_sp<FontStyleSet>(1);
+        fFamilies[2] = sk_make_sp<FontStyleSet>(2);
+    }
+
+    int onCountFamilies() const override { return SK_ARRAY_COUNT(fFamilies); }
+
+    void onGetFamilyName(int index, SkString* familyName) const override {
+        *familyName = kFamilyNames[index];
+    }
+
+    SkFontStyleSet* onCreateStyleSet(int index) const override {
+        return SkRef(fFamilies[index].get());
+    }
+
+    SkFontStyleSet* onMatchFamily(const char familyName[]) const override {
+        if (familyName) {
+            if (strstr(familyName,  "ans")) { return this->createStyleSet(0); }
+            if (strstr(familyName, "erif")) { return this->createStyleSet(1); }
+            if (strstr(familyName,  "ono")) { return this->createStyleSet(2); }
+        }
+        return this->createStyleSet(0);
+    }
+
+
+    SkTypeface* onMatchFamilyStyle(const char familyName[],
+                                   const SkFontStyle& style) const override {
+        sk_sp<SkFontStyleSet> styleSet(this->matchFamily(familyName));
+        return styleSet->matchStyle(style);
+    }
+
+    SkTypeface* onMatchFamilyStyleCharacter(const char familyName[],
+                                            const SkFontStyle& style,
+                                            const char* bcp47[], int bcp47Count,
+                                            SkUnichar character) const override {
+        (void)bcp47;
+        (void)bcp47Count;
+        (void)character;
+        return this->matchFamilyStyle(familyName, style);
+    }
+
+    SkTypeface* onMatchFaceStyle(const SkTypeface* tf,
+                                 const SkFontStyle& style) const override {
+        SkString familyName;
+        tf->getFamilyName(&familyName);
+        return this->matchFamilyStyle(familyName.c_str(), style);
+    }
+
+    sk_sp<SkTypeface> onMakeFromData(sk_sp<SkData>, int ttcIndex) const override {
+        return nullptr;
+    }
+    sk_sp<SkTypeface> onMakeFromStreamIndex(std::unique_ptr<SkStreamAsset>,
+                                            int ttcIndex) const override {
+        return nullptr;
+    }
+    sk_sp<SkTypeface> onMakeFromStreamArgs(std::unique_ptr<SkStreamAsset>,
+                                           const SkFontArguments&) const override {
+        return nullptr;
+    }
+    sk_sp<SkTypeface> onMakeFromFontData(std::unique_ptr<SkFontData>) const override {
+        return nullptr;
+    }
+    sk_sp<SkTypeface> onMakeFromFile(const char path[], int ttcIndex) const override {
+        return nullptr;
+    }
+
+    sk_sp<SkTypeface> onLegacyMakeTypeface(const char familyName[],
+                                           SkFontStyle style) const override {
+        return sk_sp<SkTypeface>(this->matchFamilyStyle(familyName, style));
+    }
+
+private:
+    sk_sp<FontStyleSet> fFamilies[3];
+};
+}
+
+namespace sk_tool_utils {
+sk_sp<SkFontMgr> MakePortableFontMgr() { return sk_make_sp<FontMgr>(); }
+} // namespace sk_tool_utils