GrPathRangeBatch

src/gpu/batches/GrDrawPathBatch.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrDrawPathBatch_DEFINED
 #define GrDrawPathBatch_DEFINED
 
+#include "GrBatchFlushState.h"
 #include "GrDrawBatch.h"
 #include "GrGpu.h"
 #include "GrPath.h"
 #include "GrPathRendering.h"
 #include "GrPathProcessor.h"
 
-class GrDrawPathBatch final : public GrDrawBatch {
+#include "SkTLList.h"
+
+class GrDrawPathBatchBase : public GrDrawBatch {
 public:
-    // This must return the concrete type because we install the stencil settings late :(
-    static GrDrawPathBatch* Create(const GrPathProcessor* primProc, const GrPath* path) {
+    void getInvariantOutputColor(GrInitInvariantOutput* out) const override {
+        this->pathProcessor()->getInvariantOutputColor(out);
+    }
+
+    void getInvariantOutputCoverage(GrInitInvariantOutput* out) const override {
+        this->pathProcessor()->getInvariantOutputCoverage(out);
+    }
+
+    void setStencilSettings(const GrStencilSettings& stencil) { fStencilSettings = stencil; }
+
+protected:
+    GrDrawPathBatchBase(const GrPathProcessor* pathProc) : fPrimitiveProcessor(pathProc) {}
+
+    GrBatchTracker* tracker() { return reinterpret_cast<GrBatchTracker*>(&fWhatchamacallit); }
+    const GrPathProcessor* pathProcessor() const { return fPrimitiveProcessor.get(); }
+    const GrStencilSettings& stencilSettings() const { return fStencilSettings; }
+    const GrPipelineOptimizations& opts() const { return fOpts; }
+
+private:
+    void initBatchTracker(const GrPipelineOptimizations& opts) override {
+        this->pathProcessor()->initBatchTracker(this->tracker(), opts);
+        fOpts = opts;
+    }
+
+    GrPendingProgramElement<const GrPathProcessor>          fPrimitiveProcessor;
+    PathBatchTracker                                        fWhatchamacallit; // TODO: delete this
+    GrStencilSettings                                       fStencilSettings;
+    GrPipelineOptimizations                                 fOpts;
+
+    typedef GrDrawBatch INHERITED;
+};
+
+class GrDrawPathBatch final : public GrDrawPathBatchBase {
+public:
+    // This can't return a more abstract type because we install the stencil settings late :(
+    static GrDrawPathBatchBase* Create(const GrPathProcessor* primProc, const GrPath* path) {
         return new GrDrawPathBatch(primProc, path);
     }
 
     const char* name() const override { return "DrawPath"; }
 
-    SkString dumpInfo() const override {
-        SkString string;
-        string.printf("PATH: 0x%p", fPath.get());
-        return string;
-    }
-
-    void getInvariantOutputColor(GrInitInvariantOutput* out) const override {
-        fPrimitiveProcessor->getInvariantOutputColor(out);
-    }
-
-    void getInvariantOutputCoverage(GrInitInvariantOutput* out) const override {
-        fPrimitiveProcessor->getInvariantOutputCoverage(out);
-    }
-
-    void setStencilSettings(const GrStencilSettings& stencil) { fStencilSettings = stencil; }
+    SkString dumpInfo() const override;
 
 private:
-    GrBatchTracker* tracker() { return reinterpret_cast<GrBatchTracker*>(&fWhatchamacallit); }
-    GrDrawPathBatch(const GrPathProcessor* primProc, const GrPath* path)
-    : fPrimitiveProcessor(primProc)
-    , fPath(path) {
+    GrDrawPathBatch(const GrPathProcessor* pathProc, const GrPath* path)
+        : INHERITED(pathProc)
+        , fPath(path) {
         fBounds = path->getBounds();
-        primProc->viewMatrix().mapRect(&fBounds);
+        this->pathProcessor()->viewMatrix().mapRect(&fBounds);
         this->initClassID<GrDrawPathBatch>();
     }
 
-    void initBatchTracker(const GrPipelineOptimizations& opts) override {
-        fPrimitiveProcessor->initBatchTracker(this->tracker(), opts);
-    }
-
     bool onCombineIfPossible(GrBatch* t, const GrCaps& caps) override { return false; }
 
     void onPrepare(GrBatchFlushState*) override {}
 
-    void onDraw(GrBatchFlushState* state) override {
-        GrProgramDesc  desc;
-        state->gpu()->buildProgramDesc(&desc, *fPrimitiveProcessor.get(),
-                                       *this->pipeline(), *this->tracker());
-        GrPathRendering::DrawPathArgs args(fPrimitiveProcessor.get(), this->pipeline(),
-                                           &desc, this->tracker(), &fStencilSettings);
-        state->gpu()->pathRendering()->drawPath(args, fPath.get());
+    void onDraw(GrBatchFlushState* state) override;
+
+    GrPendingIOResource<const GrPath, kRead_GrIOType> fPath;
+
+    typedef GrDrawPathBatchBase INHERITED;
+};
+
+/**
+ * This could be nested inside the batch class, but for now it must be declarable in a public
+ * header (GrDrawContext)
+ */
+class GrPathRangeDraw : public GrNonAtomicRef {
+public:
+    typedef GrPathRendering::PathTransformType TransformType;
+
+    static GrPathRangeDraw* Create(GrPathRange* range, TransformType transformType,
+        int reserveCnt) {
+        return SkNEW_ARGS(GrPathRangeDraw, (range, transformType, reserveCnt));
     }
 
-    GrPendingProgramElement<const GrPathProcessor>      fPrimitiveProcessor;
-    PathBatchTracker                                    fWhatchamacallit; // TODO: delete this
-    GrStencilSettings                                   fStencilSettings;
-    GrPendingIOResource<const GrPath, kRead_GrIOType>   fPath;
+    void append(uint16_t index, float transform[]) {
+        fTransforms.push_back_n(GrPathRendering::PathTransformSize(fTransformType), transform);
+        fIndices.push_back(index);
+    }
+
+    int count() const { return fIndices.count(); }
+
+    TransformType transformType() const { return fTransformType; }
+
+    const float* transforms() const { return fTransforms.begin(); }
+
+    const uint16_t* indices() const { return fIndices.begin(); }
+
+    const GrPathRange* range() const { return fPathRange.get(); }
+
+    static bool CanMerge(const GrPathRangeDraw& a, const GrPathRangeDraw& b) {
+        return a.transformType() == b.transformType() && a.range() == b.range();
+    }
+
+private:
+    GrPathRangeDraw(GrPathRange* range, TransformType transformType, int reserveCnt)
+        : fPathRange(SkRef(range))
+        , fTransformType(transformType)
+        , fIndices(reserveCnt)
+        , fTransforms(reserveCnt * GrPathRendering::PathTransformSize(transformType)) {
+        SkDEBUGCODE(fUsedInBatch = false;)
+    }
+
+    // Reserve space for 64 paths where indices are 16 bit and transforms are translations.
+    static const int kIndexReserveCnt = 64;
+    static const int kTransformBufferReserveCnt = 2 * 64;
+
+    GrPendingIOResource<const GrPathRange, kRead_GrIOType> fPathRange;
+    GrPathRendering::PathTransformType                     fTransformType;
+    SkSTArray<kIndexReserveCnt, uint16_t, true>            fIndices;
+    SkSTArray<kTransformBufferReserveCnt, float, true>     fTransforms;
+
+    // To ensure we don't reuse these across batches.
+#ifdef SK_DEBUG
+    bool fUsedInBatch;
+    friend class GrDrawPathRangeBatch;
+#endif
+
+    typedef GrNonAtomicRef INHERITED;
+};
+
+// Template this if we decide to support index types other than 16bit
+class GrDrawPathRangeBatch final : public GrDrawPathBatchBase {
+public:
+    // This can't return a more abstracet type because we install the stencil settings late :(
+    static GrDrawPathBatchBase* Create(const GrPathProcessor* pathProc,
+                                       GrPathRangeDraw* pathRangeDraw) {
+        return SkNEW_ARGS(GrDrawPathRangeBatch, (pathProc, pathRangeDraw));
+    }
+
+    ~GrDrawPathRangeBatch() override;
+
+    const char* name() const override { return "DrawPathRange"; }
+
+    SkString dumpInfo() const override;
+
+private:
+    inline bool isWinding() const;
+
+    GrDrawPathRangeBatch(const GrPathProcessor* pathProc, GrPathRangeDraw* pathRangeDraw);
+
+    bool onCombineIfPossible(GrBatch* t, const GrCaps& caps) override;
+
+    void onPrepare(GrBatchFlushState*) override {}
+
+    void onDraw(GrBatchFlushState* state) override;
+
+    typedef SkTLList<GrPathRangeDraw*> DrawList;
+    DrawList    fDraws;
+    int         fTotalPathCount;
+
+    typedef GrDrawPathBatchBase INHERITED;
 };
 
 #endif