Implement cached nvpr text blobs

src/gpu/GrStencilAndCoverTextContext.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrStencilAndCoverTextContext_DEFINED
 #define GrStencilAndCoverTextContext_DEFINED
 
 #include "GrTextContext.h"
 #include "GrDrawTarget.h"
 #include "GrStrokeInfo.h"
+#include "SkTHash.h"
+#include "SkTInternalLList.h"
+#include "SkTLList.h"
 
 class GrTextStrike;
 class GrPath;
 class GrPathRange;
 class SkSurfaceProps;
 
 /*
  * This class implements text rendering using stencil and cover path rendering
  * (by the means of GrDrawTarget::drawPath).
  * This class exposes the functionality through GrTextContext interface.
  */
 class GrStencilAndCoverTextContext : public GrTextContext {
 public:
     static GrStencilAndCoverTextContext* Create(GrContext*, const SkSurfaceProps&);
 
     virtual ~GrStencilAndCoverTextContext();
 
 private:
     GrStencilAndCoverTextContext(GrContext*, const SkSurfaceProps&);
 
-    bool canDraw(const GrRenderTarget*, const GrClip&, const GrPaint&,
-                 const SkPaint&, const SkMatrix& viewMatrix) override;
+    bool canDraw(const GrRenderTarget*, const GrClip&, const GrPaint&, const SkPaint& skPaint,
+                 const SkMatrix&) override { return this->internalCanDraw(skPaint); }
+
+    bool internalCanDraw(const SkPaint&);
 
     void onDrawText(GrDrawContext*, GrRenderTarget*, const GrClip&, const GrPaint&, const SkPaint&,
                     const SkMatrix& viewMatrix,
                     const char text[], size_t byteLength,
-                    SkScalar x, SkScalar y, const SkIRect& regionClipBounds) override;
+                    SkScalar x, SkScalar y, const SkIRect& clipBounds) override;
     void onDrawPosText(GrDrawContext*, GrRenderTarget*,
                        const GrClip&, const GrPaint&, const SkPaint&,
                        const SkMatrix& viewMatrix,
                        const char text[], size_t byteLength,
                        const SkScalar pos[], int scalarsPerPosition,
-                       const SkPoint& offset, const SkIRect& regionClipBounds) override;
+                       const SkPoint& offset, const SkIRect& clipBounds) override;
+    void drawTextBlob(GrDrawContext*, GrRenderTarget*, const GrClip&, const SkPaint&,
+                      const SkMatrix& viewMatrix, const SkTextBlob*, SkScalar x, SkScalar y,
+                      SkDrawFilter*, const SkIRect& clipBounds) override;
 
     class FallbackBlobBuilder;
 
     class TextRun {
     public:
         TextRun(const SkPaint& fontAndStroke);
         ~TextRun();
 
         void setText(const char text[], size_t byteLength, SkScalar x, SkScalar y,
                      GrContext*, const SkSurfaceProps*);
 
         void setPosText(const char text[], size_t byteLength,
                         const SkScalar pos[], int scalarsPerPosition, const SkPoint& offset,
                         GrContext*, const SkSurfaceProps*);
 
-        void draw(GrDrawContext*, GrRenderTarget*, const GrClip&, const GrPaint&, const SkMatrix&,
-                  const SkIRect& regionClipBounds, GrTextContext* fallbackTextContext,
-                  const SkPaint& originalSkPaint) const;
+        void draw(GrDrawContext*, GrPipelineBuilder*, GrColor, const SkMatrix&,
+                  SkScalar x, SkScalar y, const SkIRect& clipBounds,
+                  GrTextContext* fallbackTextContext, const SkPaint& originalSkPaint) const;
+
+        int cpuMemorySize() const;
 
     private:
         GrPathRange* createGlyphs(GrContext*, SkGlyphCache*);
 
         void appendGlyph(const SkGlyph&, const SkPoint&, FallbackBlobBuilder*);
 
         GrStrokeInfo                     fStroke;
         SkPaint                          fFont;
         SkScalar                         fTextRatio;
         float                            fTextInverseRatio;
-        SkMatrix                         fLocalMatrix;
         bool                             fUsingRawGlyphPaths;
+        int                              fTotalGlyphCount;
         SkAutoTUnref<GrPathRangeDraw>    fDraw;
         SkAutoTUnref<const SkTextBlob>   fFallbackTextBlob;
+        mutable SkMatrix                 fLocalMatrixTemplate;
     };
 
+    // Text blobs/caches.
+
+    class TextBlob : public SkTLList<TextRun> {
+    public:
+        typedef SkTArray<uint32_t, true> Key;
+
+        static const Key& GetKey(const TextBlob* blob) { return blob->key(); }
+
+        static uint32_t Hash(const Key& key) {
+            SkASSERT(key.count() > 1); // 1-length keys should be using the blob-id hash map.
+            return SkChecksum::Murmur3(key.begin(), sizeof(uint32_t) * key.count());
+        }
+
+        TextBlob(uint32_t blobId, const SkTextBlob* skBlob, const SkPaint& skPaint,
+                 GrContext* ctx, const SkSurfaceProps* props)
+            : fKey(&blobId, 1) { this->init(skBlob, skPaint, ctx, props); }
+
+        TextBlob(const Key& key, const SkTextBlob* skBlob, const SkPaint& skPaint,
+                 GrContext* ctx, const SkSurfaceProps* props)
+            : fKey(key) {
+            // 1-length keys are unterstood to be the blob id and must use the other constructor.
+            SkASSERT(fKey.count() > 1);
+            this->init(skBlob, skPaint, ctx, props);
+        }
+
+        const Key& key() const { return fKey; }
+
+        int cpuMemorySize() const { return fCpuMemorySize; }
+
+    private:
+        void init(const SkTextBlob*, const SkPaint&, GrContext*, const SkSurfaceProps*);
+
+        const SkSTArray<1, uint32_t, true>   fKey;
+        int                                  fCpuMemorySize;
+
+        SK_DECLARE_INTERNAL_LLIST_INTERFACE(TextBlob);
+    };
+
+    const TextBlob& findOrCreateTextBlob(const SkTextBlob*, const SkPaint&);
+    void purgeToFit(const TextBlob&);
+
+    SkTHashMap<uint32_t, TextBlob*>                           fBlobIdCache;
+    SkTHashTable<TextBlob*, const TextBlob::Key&, TextBlob>   fBlobKeyCache;
+    SkTInternalLList<TextBlob>                                fLRUList;
+    int                                                       fCacheSize;
+
     typedef GrTextContext INHERITED;
 };
 
 #endif