Font variations.

Multiple Master and TrueType fonts support variation axes.
This implements back-end support for axes on platforms which
support it.

Committed: https://skia.googlesource.com/skia/+/05773ed30920c0214d1433c07cf6360a05476c97

Review URL: https://codereview.chromium.org/1027373002

1 files changed, 40 insertions, 10 deletions

diff --git a/src/core/SkFontDescriptor.h b/src/core/SkFontDescriptor.h
index 66707ddd3c..933a36a095 100644
--- a/src/core/SkFontDescriptor.h
+++ b/src/core/SkFontDescriptor.h
@@ -12,7 +12,42 @@
 #include "SkString.h"
 #include "SkTypeface.h"
 
-class SkFontDescriptor {
+class SkFontData {
+public:
+    /** This takes ownership of 'stream'. Makes a copy of the data in 'axis'. */
+    SkFontData(SkStreamAsset* stream, int index, const SkFixed axis[], int axisCount)
+        : fStream(stream), fIndex(index), fAxisCount(axisCount), fAxis(axisCount)
+    {
+        for (int i = 0; i < axisCount; ++i) {
+            fAxis[i] = axis[i];
+        }
+    }
+    SkFontData(const SkFontData& that)
+        : fStream(that.fStream->duplicate())
+        , fIndex(that.fIndex)
+        , fAxisCount(that.fAxisCount)
+        , fAxis(fAxisCount)
+    {
+        for (int i = 0; i < fAxisCount; ++i) {
+            fAxis[i] = that.fAxis[i];
+        }
+    }
+    bool hasStream() const { return fStream.get() != NULL; }
+    SkStreamAsset* duplicateStream() const { return fStream->duplicate(); }
+    SkStreamAsset* detachStream() { return fStream.detach(); }
+    SkStreamAsset* getStream() { return fStream.get(); }
+    int getIndex() const { return fIndex; }
+    int getAxisCount() const { return fAxisCount; }
+    const SkFixed* getAxis() const { return fAxis.get(); }
+
+private:
+    SkAutoTDelete<SkStreamAsset> fStream;
+    int fIndex;
+    int fAxisCount;
+    SkAutoSTMalloc<4, SkFixed> fAxis;
+};
+
+class SkFontDescriptor : SkNoncopyable {
 public:
     SkFontDescriptor(SkTypeface::Style = SkTypeface::kNormal);
     // Does not affect ownership of SkStream.
@@ -27,25 +62,20 @@ public:
     const char* getFullName() const { return fFullName.c_str(); }
     const char* getPostscriptName() const { return fPostscriptName.c_str(); }
     bool hasFontData() const { return fFontData.get() != NULL; }
-    // Transfers ownership to the caller.
-    SkStreamAsset* transferFontData() { return fFontData.detach(); }
-    int getFontIndex() const { return fFontIndex; }
+    SkFontData* detachFontData() { return fFontData.detach(); }
 
     void setFamilyName(const char* name) { fFamilyName.set(name); }
     void setFullName(const char* name) { fFullName.set(name); }
     void setPostscriptName(const char* name) { fPostscriptName.set(name); }
     /** Set the font data only if it is necessary for serialization.
-     *  This method takes ownership of the stream (both reference and cursor).
-     */
-    void setFontData(SkStreamAsset* stream) { fFontData.reset(stream); }
-    void setFontIndex(int index) { fFontIndex = index; }
+     *  This method takes ownership of the font data. */
+    void setFontData(SkFontData* data) { fFontData.reset(data); }
 
 private:
     SkString fFamilyName;
     SkString fFullName;
     SkString fPostscriptName;
-    SkAutoTDelete<SkStreamAsset> fFontData;
-    int fFontIndex;
+    SkAutoTDelete<SkFontData> fFontData;
 
     SkTypeface::Style fStyle;
 };