Initial implementation of GPU no filter NinePatch

src/gpu/batches/GrNinePatch.cpp

+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "GrNinePatch.h"
+
+#include "GrBatchFlushState.h"
+#include "GrDefaultGeoProcFactory.h"
+#include "GrResourceProvider.h"
+#include "GrVertexBatch.h"
+#include "SkBitmap.h"
+#include "SkNinePatchIter.h"
+#include "SkRect.h"
+
+static const GrGeometryProcessor* create_gp(bool readsCoverage) {
+    using namespace GrDefaultGeoProcFactory;
+    Color color(Color::kAttribute_Type);
+    Coverage coverage(readsCoverage ? Coverage::kSolid_Type : Coverage::kNone_Type);
+    LocalCoords localCoords(LocalCoords::kHasExplicit_Type);
+    return GrDefaultGeoProcFactory::Create(color, coverage, localCoords, SkMatrix::I());
+}
+
+class GrNonAANinePatchBatch : public GrVertexBatch {
+public:
+    DEFINE_BATCH_CLASS_ID
+
+    static const int kVertsPerRect = 4;
+    static const int kIndicesPerRect = 6;
+    static const int kRectsPerInstance = 9; // We could skip empty rects
+
+    struct Geometry {
+        SkMatrix fViewMatrix;
+        SkIRect fCenter;
+        SkRect fDst;
+        GrColor fColor;
+    };
+
+    GrNonAANinePatchBatch(GrColor color, const SkMatrix& viewMatrix, int imageWidth,
+                          int imageHeight, const SkIRect& center, const SkRect &dst)
+        : INHERITED(ClassID()) {
+        Geometry& geo = fGeoData.push_back();
+        geo.fViewMatrix = viewMatrix;
+        geo.fColor = color;
+        geo.fCenter = center;
+        geo.fDst = dst;
+
+        fImageWidth = imageWidth;
+        fImageHeight = imageHeight;
+
+        // setup bounds
+        geo.fViewMatrix.mapRect(&fBounds, geo.fDst);
+    }
+
+    const char* name() const override { return "GrNonAANinePatchBatch"; }
+
+    void getInvariantOutputColor(GrInitInvariantOutput* out) const override {
+        out->setUnknownFourComponents();
+    }
+
+    void getInvariantOutputCoverage(GrInitInvariantOutput* out) const override {
+        out->setKnownSingleComponent(0xff);
+    }
+
+    SkSTArray<1, Geometry, true>* geoData() { return &fGeoData; }
+
+private:
+    void onPrepareDraws(Target* target) override {
+        SkAutoTUnref<const GrGeometryProcessor> gp(create_gp(fOpts.readsCoverage()));
+        if (!gp) {
+            SkDebugf("Couldn't create GrGeometryProcessor\n");
+            return;
+        }
+
+        target->initDraw(gp, this->pipeline());
+
+        size_t vertexStride = gp->getVertexStride();
+        int instanceCount = fGeoData.count();
+
+        SkAutoTUnref<const GrIndexBuffer> indexBuffer(
+                target->resourceProvider()->refQuadIndexBuffer());
+        InstancedHelper helper;
+        void* vertices = helper.init(target, kTriangles_GrPrimitiveType, vertexStride,
+                                     indexBuffer, kVertsPerRect,
+                                     kIndicesPerRect, instanceCount * kRectsPerInstance);
+        if (!vertices || !indexBuffer) {
+            SkDebugf("Could not allocate vertices\n");
+            return;
+        }
+
+        for (int i = 0; i < instanceCount; i++) {
+            intptr_t verts = reinterpret_cast<intptr_t>(vertices) +
+                             i * kRectsPerInstance * kVertsPerRect * vertexStride;
+
+            Geometry& geo = fGeoData[i];
+            SkNinePatchIter iter(fImageWidth, fImageHeight, geo.fCenter, geo.fDst);
+
+            SkRect srcR, dstR;
+            while (iter.next(&srcR, &dstR)) {
+                SkPoint* positions = reinterpret_cast<SkPoint*>(verts);
+
+                positions->setRectFan(dstR.fLeft, dstR.fTop,
+                                      dstR.fRight, dstR.fBottom, vertexStride);
+
+                SkASSERT(!geo.fViewMatrix.hasPerspective());
+                geo.fViewMatrix.mapPointsWithStride(positions, vertexStride, kVertsPerRect);
+
+                // Setup local coords
+                static const int kLocalOffset = sizeof(SkPoint) + sizeof(GrColor);
+                SkPoint* coords = reinterpret_cast<SkPoint*>(verts + kLocalOffset);
+                coords->setRectFan(srcR.fLeft, srcR.fTop, srcR.fRight, srcR.fBottom, vertexStride);
+
+                static const int kColorOffset = sizeof(SkPoint);
+                GrColor* vertColor = reinterpret_cast<GrColor*>(verts + kColorOffset);
+                for (int j = 0; j < 4; ++j) {
+                    *vertColor = geo.fColor;
+                    vertColor = (GrColor*) ((intptr_t) vertColor + vertexStride);
+                }
+                verts += kVertsPerRect * vertexStride;
+            }
+        }
+        helper.recordDraw(target);
+    }
+
+    void initBatchTracker(const GrPipelineOptimizations& opt) override {
+        opt.getOverrideColorIfSet(&fGeoData[0].fColor);
+        fOpts = opt;
+    }
+
+    bool onCombineIfPossible(GrBatch* t, const GrCaps& caps) override {
+        GrNonAANinePatchBatch* that = t->cast<GrNonAANinePatchBatch>();
+        if (!GrPipeline::CanCombine(*this->pipeline(), this->bounds(), *that->pipeline(),
+                                    that->bounds(), caps)) {
+            return false;
+        }
+
+        SkASSERT(this->fImageWidth == that->fImageWidth &&
+                 this->fImageHeight == that->fImageHeight);
+
+        // In the event of two batches, one who can tweak, one who cannot, we just fall back to
+        // not tweaking
+        if (fOpts.canTweakAlphaForCoverage() && !that->fOpts.canTweakAlphaForCoverage()) {
+            fOpts = that->fOpts;
+        }
+
+        fGeoData.push_back_n(that->geoData()->count(), that->geoData()->begin());
+        this->joinBounds(that->bounds());
+        return true;
+    }
+
+    GrPipelineOptimizations fOpts;
+    int fImageWidth;
+    int fImageHeight;
+    SkSTArray<1, Geometry, true> fGeoData;
+
+    typedef GrVertexBatch INHERITED;
+};
+
+namespace GrNinePatch {
+GrDrawBatch* CreateNonAA(GrColor color, const SkMatrix& viewMatrix, int imageWidth, int imageHeight,
+                         const SkIRect& center, const SkRect& dst) {
+    return new GrNonAANinePatchBatch(color, viewMatrix, imageWidth, imageHeight, center, dst);
+}
+};