Use per-typeface sets of glyphs for nvpr text

src/gpu/GrContext.cpp

Index: src/gpu/GrContext.cpp
diff --git a/src/gpu/GrContext.cpp b/src/gpu/GrContext.cpp
index 8d515bf09c295e1bb608b54c5b34f85ca2eb6453..06d579e8542d44dbd94945a20a6965e4589e50c2 100755
--- a/src/gpu/GrContext.cpp
+++ b/src/gpu/GrContext.cpp
@@ -1926,6 +1926,32 @@ GrPath* GrContext::createPath(const SkPath& inPath, const SkStrokeRec& stroke) {
     return path;
 }
 
+GrPathRange* GrContext::createGlyphs(const SkTypeface* typeface,
+                                     const SkDescriptor* desc,
+                                     const SkStrokeRec& stroke) {
+    static const GrCacheID::Domain gGlyphsDomain = GrCacheID::GenerateDomain();
+
+    SkASSERT(fGpu->caps()->pathRenderingSupport());
+
+    GrCacheID::Key key;
+    uint64_t* keyData = key.fData64;
+    keyData[0] = desc ? desc->getChecksum() : 0;
+    keyData[0] = (keyData[0] << 32) | (typeface ? typeface->uniqueID() : 0);
+    keyData[1] = GrPath::ComputeStrokeKey(stroke);
+    GrResourceKey resourceKey = GrResourceKey(GrCacheID(gGlyphsDomain, key),
+                                              GrPathRange::resourceType(), 0);
+
+    GrPathRange* glyphs = static_cast<GrPathRange*>(fResourceCache->find(resourceKey));
+    if (glyphs && (NULL == desc || glyphs->isEqualTo(*desc))) {
+        glyphs->ref();
+    } else {
+        glyphs = fGpu->createGlyphs(typeface, desc, stroke);
+        fResourceCache->purgeAsNeeded(1, glyphs->gpuMemorySize());
+        fResourceCache->addResource(resourceKey, glyphs);
+    }
+    return glyphs;
+}
+
 void GrContext::addResourceToCache(const GrResourceKey& resourceKey, GrGpuResource* resource) {
     fResourceCache->purgeAsNeeded(1, resource->gpuMemorySize());
     fResourceCache->addResource(resourceKey, resource);