Move AAFillRect into CPP for templatization

src/gpu/batches/GrAAFillRectBatch.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 "GrAAFillRectBatch.h"
 
+#include "GrBatch.h"
+#include "GrColor.h"
 #include "GrDefaultGeoProcFactory.h"
 #include "GrResourceKey.h"
 #include "GrResourceProvider.h"
+#include "GrTypes.h"
+#include "SkMatrix.h"
+#include "SkRect.h"
 
 GR_DECLARE_STATIC_UNIQUE_KEY(gAAFillRectIndexBufferKey);
 
 static void set_inset_fan(SkPoint* pts, size_t stride,
                           const SkRect& r, SkScalar dx, SkScalar dy) {
     pts->setRectFan(r.fLeft + dx, r.fTop + dy,
                     r.fRight - dx, r.fBottom - dy, stride);
 }
 
 static const GrGeometryProcessor* create_fill_rect_gp(bool tweakAlphaForCoverage,
@@ skipping 11 matching lines @@
         coverageType = Coverage::kSolid_Type;
     } else {
         coverageType = Coverage::kAttribute_Type;
     }
     Coverage coverage(coverageType);
     LocalCoords localCoords(usesLocalCoords ? LocalCoords::kUsePosition_Type :
                                               LocalCoords::kUnused_Type);
     return CreateForDeviceSpace(color, coverage, localCoords, viewMatrix);
 }
 
-void GrAAFillRectBatch::initBatchTracker(const GrPipelineOptimizations& opt) {
-    // Handle any color overrides
-    if (!opt.readsColor()) {
-        fGeoData[0].fColor = GrColor_ILLEGAL;
-    }
-    opt.getOverrideColorIfSet(&fGeoData[0].fColor);
-
-    // setup batch properties
-    fBatch.fColorIgnored = !opt.readsColor();
-    fBatch.fColor = fGeoData[0].fColor;
-    fBatch.fUsesLocalCoords = opt.readsLocalCoords();
-    fBatch.fCoverageIgnored = !opt.readsCoverage();
-    fBatch.fCanTweakAlphaForCoverage = opt.canTweakAlphaForCoverage();
+class AAFillRectBatch : public GrBatch {
+public:
+    struct Geometry {
+        GrColor fColor;
+        SkMatrix fViewMatrix;
+        SkRect fRect;
+        SkRect fDevRect;
+    };
+
+    static GrBatch* Create(GrColor color,
+                           const SkMatrix& viewMatrix,
+                           const SkRect& rect,
+                           const SkRect& devRect) {
+        return SkNEW_ARGS(AAFillRectBatch, (color, viewMatrix, rect, devRect));
+    }
+
+    const char* name() const override { return "AAFillRectBatch"; }
+
+    void getInvariantOutputColor(GrInitInvariantOutput* out) const override {
+        // When this is called on a batch, there is only one geometry bundle
+        out->setKnownFourComponents(fGeoData[0].fColor);
+    }
+
+    void getInvariantOutputCoverage(GrInitInvariantOutput* out) const override {
+        out->setUnknownSingleComponent();
+    }
+
+    void initBatchTracker(const GrPipelineOptimizations& opt) override {
+        // Handle any color overrides
+        if (!opt.readsColor()) {
+            fGeoData[0].fColor = GrColor_ILLEGAL;
+        }
+        opt.getOverrideColorIfSet(&fGeoData[0].fColor);
+
+        // setup batch properties
+        fBatch.fColorIgnored = !opt.readsColor();
+        fBatch.fColor = fGeoData[0].fColor;
+        fBatch.fUsesLocalCoords = opt.readsLocalCoords();
+        fBatch.fCoverageIgnored = !opt.readsCoverage();
+        fBatch.fCanTweakAlphaForCoverage = opt.canTweakAlphaForCoverage();
+    }
+
+    void generateGeometry(GrBatchTarget* batchTarget) override {
+        bool canTweakAlphaForCoverage = this->canTweakAlphaForCoverage();
+
+        SkAutoTUnref<const GrGeometryProcessor> gp(create_fill_rect_gp(canTweakAlphaForCoverage,
+                                                                       this->viewMatrix(),
+                                                                       this->usesLocalCoords(),
+                                                                       this->coverageIgnored()));
+        if (!gp) {
+            SkDebugf("Couldn't create GrGeometryProcessor\n");
+            return;
+        }
+
+        batchTarget->initDraw(gp, this->pipeline());
+
+        size_t vertexStride = gp->getVertexStride();
+        SkASSERT(canTweakAlphaForCoverage ?
+                 vertexStride == sizeof(GrDefaultGeoProcFactory::PositionColorAttr) :
+                 vertexStride == sizeof(GrDefaultGeoProcFactory::PositionColorCoverageAttr));
+        int instanceCount = fGeoData.count();
+
+        SkAutoTUnref<const GrIndexBuffer> indexBuffer(this->getIndexBuffer(
+            batchTarget->resourceProvider()));
+        InstancedHelper helper;
+        void* vertices = helper.init(batchTarget, kTriangles_GrPrimitiveType, vertexStride,
+                                     indexBuffer, kVertsPerAAFillRect, kIndicesPerAAFillRect,
+                                     instanceCount);
+        if (!vertices || !indexBuffer) {
+            SkDebugf("Could not allocate vertices\n");
+            return;
+        }
+
+        for (int i = 0; i < instanceCount; i++) {
+            const Geometry& args = fGeoData[i];
+            this->generateAAFillRectGeometry(vertices,
+                                             i * kVertsPerAAFillRect * vertexStride,
+                                             vertexStride,
+                                             args.fColor,
+                                             args.fViewMatrix,
+                                             args.fRect,
+                                             args.fDevRect,
+                                             canTweakAlphaForCoverage);
+        }
+
+        helper.issueDraw(batchTarget);
+    }
+
+    SkSTArray<1, Geometry, true>* geoData() { return &fGeoData; }
+
+private:
+    AAFillRectBatch(GrColor color, const SkMatrix& viewMatrix, const SkRect& rect,
+                      const SkRect& devRect) {
+        this->initClassID<AAFillRectBatch>();
+        Geometry& geometry = fGeoData.push_back();
+        geometry.fRect = rect;
+        geometry.fViewMatrix = viewMatrix;
+        geometry.fDevRect = devRect;
+        geometry.fColor = color;
+
+        this->setBounds(geometry.fDevRect);
+    }
+
+    static const int kNumAAFillRectsInIndexBuffer = 256;
+    static const int kVertsPerAAFillRect = 8;
+    static const int kIndicesPerAAFillRect = 30;
+
+    const GrIndexBuffer* getIndexBuffer(GrResourceProvider* resourceProvider) {
+        GR_DEFINE_STATIC_UNIQUE_KEY(gAAFillRectIndexBufferKey);
+
+        static const uint16_t gFillAARectIdx[] = {
+            0, 1, 5, 5, 4, 0,
+            1, 2, 6, 6, 5, 1,
+            2, 3, 7, 7, 6, 2,
+            3, 0, 4, 4, 7, 3,
+            4, 5, 6, 6, 7, 4,
+        };
+        GR_STATIC_ASSERT(SK_ARRAY_COUNT(gFillAARectIdx) == kIndicesPerAAFillRect);
+        return resourceProvider->findOrCreateInstancedIndexBuffer(gFillAARectIdx,
+            kIndicesPerAAFillRect, kNumAAFillRectsInIndexBuffer, kVertsPerAAFillRect,
+            gAAFillRectIndexBufferKey);
+    }
+
+    GrColor color() const { return fBatch.fColor; }
+    bool usesLocalCoords() const { return fBatch.fUsesLocalCoords; }
+    bool canTweakAlphaForCoverage() const { return fBatch.fCanTweakAlphaForCoverage; }
+    bool colorIgnored() const { return fBatch.fColorIgnored; }
+    const SkMatrix& viewMatrix() const { return fGeoData[0].fViewMatrix; }
+    bool coverageIgnored() const { return fBatch.fCoverageIgnored; }
+
+    bool onCombineIfPossible(GrBatch* t) override {
+        if (!this->pipeline()->isEqual(*t->pipeline())) {
+            return false;
+        }
+
+        AAFillRectBatch* that = t->cast<AAFillRectBatch>();
+
+        SkASSERT(this->usesLocalCoords() == that->usesLocalCoords());
+        // We apply the viewmatrix to the rect points on the cpu.  However, if the pipeline uses
+        // local coords then we won't be able to batch.  We could actually upload the viewmatrix
+        // using vertex attributes in these cases, but haven't investigated that
+        if (this->usesLocalCoords() && !this->viewMatrix().cheapEqualTo(that->viewMatrix())) {
+            return false;
+        }
+
+        if (this->color() != that->color()) {
+            fBatch.fColor = GrColor_ILLEGAL;
+        }
+
+        // In the event of two batches, one who can tweak, one who cannot, we just fall back to
+        // not tweaking
+        if (this->canTweakAlphaForCoverage() != that->canTweakAlphaForCoverage()) {
+            fBatch.fCanTweakAlphaForCoverage = false;
+        }
+
+        fGeoData.push_back_n(that->geoData()->count(), that->geoData()->begin());
+        this->joinBounds(that->bounds());
+        return true;
+    }
+
+    void generateAAFillRectGeometry(void* vertices,
+                                    size_t offset,
+                                    size_t vertexStride,
+                                    GrColor color,
+                                    const SkMatrix& viewMatrix,
+                                    const SkRect& rect,
+                                    const SkRect& devRect,
+                                    bool tweakAlphaForCoverage) const {
+        intptr_t verts = reinterpret_cast<intptr_t>(vertices) + offset;
+
+        SkPoint* fan0Pos = reinterpret_cast<SkPoint*>(verts);
+        SkPoint* fan1Pos = reinterpret_cast<SkPoint*>(verts + 4 * vertexStride);
+
+        SkScalar inset = SkMinScalar(devRect.width(), SK_Scalar1);
+        inset = SK_ScalarHalf * SkMinScalar(inset, devRect.height());
+
+        if (viewMatrix.rectStaysRect()) {
+            set_inset_fan(fan0Pos, vertexStride, devRect, -SK_ScalarHalf, -SK_ScalarHalf);
+            set_inset_fan(fan1Pos, vertexStride, devRect, inset,  inset);
+        } else {
+            // compute transformed (1, 0) and (0, 1) vectors
+            SkVector vec[2] = {
+              { viewMatrix[SkMatrix::kMScaleX], viewMatrix[SkMatrix::kMSkewY] },
+              { viewMatrix[SkMatrix::kMSkewX],  viewMatrix[SkMatrix::kMScaleY] }
+            };
+
+            vec[0].normalize();
+            vec[0].scale(SK_ScalarHalf);
+            vec[1].normalize();
+            vec[1].scale(SK_ScalarHalf);
+
+            // create the rotated rect
+            fan0Pos->setRectFan(rect.fLeft, rect.fTop,
+                                rect.fRight, rect.fBottom, vertexStride);
+            viewMatrix.mapPointsWithStride(fan0Pos, vertexStride, 4);
+
+            // Now create the inset points and then outset the original
+            // rotated points
+
+            // TL
+            *((SkPoint*)((intptr_t)fan1Pos + 0 * vertexStride)) =
+                *((SkPoint*)((intptr_t)fan0Pos + 0 * vertexStride)) + vec[0] + vec[1];
+            *((SkPoint*)((intptr_t)fan0Pos + 0 * vertexStride)) -= vec[0] + vec[1];
+            // BL
+            *((SkPoint*)((intptr_t)fan1Pos + 1 * vertexStride)) =
+                *((SkPoint*)((intptr_t)fan0Pos + 1 * vertexStride)) + vec[0] - vec[1];
+            *((SkPoint*)((intptr_t)fan0Pos + 1 * vertexStride)) -= vec[0] - vec[1];
+            // BR
+            *((SkPoint*)((intptr_t)fan1Pos + 2 * vertexStride)) =
+                *((SkPoint*)((intptr_t)fan0Pos + 2 * vertexStride)) - vec[0] - vec[1];
+            *((SkPoint*)((intptr_t)fan0Pos + 2 * vertexStride)) += vec[0] + vec[1];
+            // TR
+            *((SkPoint*)((intptr_t)fan1Pos + 3 * vertexStride)) =
+                *((SkPoint*)((intptr_t)fan0Pos + 3 * vertexStride)) - vec[0] + vec[1];
+            *((SkPoint*)((intptr_t)fan0Pos + 3 * vertexStride)) += vec[0] - vec[1];
+        }
+
+        // Make verts point to vertex color and then set all the color and coverage vertex attrs
+        // values.
+        verts += sizeof(SkPoint);
+        for (int i = 0; i < 4; ++i) {
+            if (tweakAlphaForCoverage) {
+                *reinterpret_cast<GrColor*>(verts + i * vertexStride) = 0;
+            } else {
+                *reinterpret_cast<GrColor*>(verts + i * vertexStride) = color;
+                *reinterpret_cast<float*>(verts + i * vertexStride + sizeof(GrColor)) = 0;
+            }
+        }
+
+        int scale;
+        if (inset < SK_ScalarHalf) {
+            scale = SkScalarFloorToInt(512.0f * inset / (inset + SK_ScalarHalf));
+            SkASSERT(scale >= 0 && scale <= 255);
+        } else {
+            scale = 0xff;
+        }
+
+        verts += 4 * vertexStride;
+
+        float innerCoverage = GrNormalizeByteToFloat(scale);
+        GrColor scaledColor = (0xff == scale) ? color : SkAlphaMulQ(color, scale);
+
+        for (int i = 0; i < 4; ++i) {
+            if (tweakAlphaForCoverage) {
+                *reinterpret_cast<GrColor*>(verts + i * vertexStride) = scaledColor;
+            } else {
+                *reinterpret_cast<GrColor*>(verts + i * vertexStride) = color;
+                *reinterpret_cast<float*>(verts + i * vertexStride +
+                                          sizeof(GrColor)) = innerCoverage;
+            }
+        }
+    }
+
+    struct BatchTracker {
+        GrColor fColor;
+        bool fUsesLocalCoords;
+        bool fColorIgnored;
+        bool fCoverageIgnored;
+        bool fCanTweakAlphaForCoverage;
+    };
+
+    BatchTracker fBatch;
+    SkSTArray<1, Geometry, true> fGeoData;
+};
+
+namespace GrAAFillRectBatch {
+
+GrBatch* Create(GrColor color,
+                const SkMatrix& viewMatrix,
+                const SkRect& rect,
+                const SkRect& devRect) {
+    return AAFillRectBatch::Create(color, viewMatrix, rect, devRect);
 }
 
-void GrAAFillRectBatch::generateGeometry(GrBatchTarget* batchTarget) {
-    bool canTweakAlphaForCoverage = this->canTweakAlphaForCoverage();
-
-    SkAutoTUnref<const GrGeometryProcessor> gp(create_fill_rect_gp(canTweakAlphaForCoverage,
-                                                                   this->viewMatrix(),
-                                                                   this->usesLocalCoords(),
-                                                                   this->coverageIgnored()));
-    if (!gp) {
-        SkDebugf("Couldn't create GrGeometryProcessor\n");
-        return;
-    }
-
-    batchTarget->initDraw(gp, this->pipeline());
-
-    size_t vertexStride = gp->getVertexStride();
-    SkASSERT(canTweakAlphaForCoverage ?
-             vertexStride == sizeof(GrDefaultGeoProcFactory::PositionColorAttr) :
-             vertexStride == sizeof(GrDefaultGeoProcFactory::PositionColorCoverageAttr));
-    int instanceCount = fGeoData.count();
-
-    SkAutoTUnref<const GrIndexBuffer> indexBuffer(this->getIndexBuffer(
-        batchTarget->resourceProvider()));
-    InstancedHelper helper;
-    void* vertices = helper.init(batchTarget, kTriangles_GrPrimitiveType, vertexStride,
-                                 indexBuffer, kVertsPerAAFillRect, kIndicesPerAAFillRect,
-                                 instanceCount);
-    if (!vertices || !indexBuffer) {
-        SkDebugf("Could not allocate vertices\n");
-        return;
-    }
-
-    for (int i = 0; i < instanceCount; i++) {
-        const Geometry& args = fGeoData[i];
-        this->generateAAFillRectGeometry(vertices,
-                                         i * kVertsPerAAFillRect * vertexStride,
-                                         vertexStride,
-                                         args.fColor,
-                                         args.fViewMatrix,
-                                         args.fRect,
-                                         args.fDevRect,
-                                         canTweakAlphaForCoverage);
-    }
-
-    helper.issueDraw(batchTarget);
-}
-
-const GrIndexBuffer* GrAAFillRectBatch::getIndexBuffer(GrResourceProvider* resourceProvider) {
-    GR_DEFINE_STATIC_UNIQUE_KEY(gAAFillRectIndexBufferKey);
-
-    static const uint16_t gFillAARectIdx[] = {
-        0, 1, 5, 5, 4, 0,
-        1, 2, 6, 6, 5, 1,
-        2, 3, 7, 7, 6, 2,
-        3, 0, 4, 4, 7, 3,
-        4, 5, 6, 6, 7, 4,
-    };
-    GR_STATIC_ASSERT(SK_ARRAY_COUNT(gFillAARectIdx) == kIndicesPerAAFillRect);
-    return resourceProvider->findOrCreateInstancedIndexBuffer(gFillAARectIdx,
-        kIndicesPerAAFillRect, kNumAAFillRectsInIndexBuffer, kVertsPerAAFillRect,
-        gAAFillRectIndexBufferKey);
-}
-
-bool GrAAFillRectBatch::onCombineIfPossible(GrBatch* t) {
-    if (!this->pipeline()->isEqual(*t->pipeline())) {
-        return false;
-    }
-
-    GrAAFillRectBatch* that = t->cast<GrAAFillRectBatch>();
-
-    SkASSERT(this->usesLocalCoords() == that->usesLocalCoords());
-    // We apply the viewmatrix to the rect points on the cpu.  However, if the pipeline uses
-    // local coords then we won't be able to batch.  We could actually upload the viewmatrix
-    // using vertex attributes in these cases, but haven't investigated that
-    if (this->usesLocalCoords() && !this->viewMatrix().cheapEqualTo(that->viewMatrix())) {
-        return false;
-    }
-
-    if (this->color() != that->color()) {
-        fBatch.fColor = GrColor_ILLEGAL;
-    }
-
-    // In the event of two batches, one who can tweak, one who cannot, we just fall back to
-    // not tweaking
-    if (this->canTweakAlphaForCoverage() != that->canTweakAlphaForCoverage()) {
-        fBatch.fCanTweakAlphaForCoverage = false;
-    }
-
-    fGeoData.push_back_n(that->geoData()->count(), that->geoData()->begin());
-    this->joinBounds(that->bounds());
-    return true;
-}
-
-void GrAAFillRectBatch::generateAAFillRectGeometry(void* vertices,
-                                                   size_t offset,
-                                                   size_t vertexStride,
-                                                   GrColor color,
-                                                   const SkMatrix& viewMatrix,
-                                                   const SkRect& rect,
-                                                   const SkRect& devRect,
-                                                   bool tweakAlphaForCoverage) const {
-    intptr_t verts = reinterpret_cast<intptr_t>(vertices) + offset;
-
-    SkPoint* fan0Pos = reinterpret_cast<SkPoint*>(verts);
-    SkPoint* fan1Pos = reinterpret_cast<SkPoint*>(verts + 4 * vertexStride);
-
-    SkScalar inset = SkMinScalar(devRect.width(), SK_Scalar1);
-    inset = SK_ScalarHalf * SkMinScalar(inset, devRect.height());
-
-    if (viewMatrix.rectStaysRect()) {
-        set_inset_fan(fan0Pos, vertexStride, devRect, -SK_ScalarHalf, -SK_ScalarHalf);
-        set_inset_fan(fan1Pos, vertexStride, devRect, inset,  inset);
-    } else {
-        // compute transformed (1, 0) and (0, 1) vectors
-        SkVector vec[2] = {
-          { viewMatrix[SkMatrix::kMScaleX], viewMatrix[SkMatrix::kMSkewY] },
-          { viewMatrix[SkMatrix::kMSkewX],  viewMatrix[SkMatrix::kMScaleY] }
-        };
-
-        vec[0].normalize();
-        vec[0].scale(SK_ScalarHalf);
-        vec[1].normalize();
-        vec[1].scale(SK_ScalarHalf);
-
-        // create the rotated rect
-        fan0Pos->setRectFan(rect.fLeft, rect.fTop,
-                            rect.fRight, rect.fBottom, vertexStride);
-        viewMatrix.mapPointsWithStride(fan0Pos, vertexStride, 4);
-
-        // Now create the inset points and then outset the original
-        // rotated points
-
-        // TL
-        *((SkPoint*)((intptr_t)fan1Pos + 0 * vertexStride)) =
-            *((SkPoint*)((intptr_t)fan0Pos + 0 * vertexStride)) + vec[0] + vec[1];
-        *((SkPoint*)((intptr_t)fan0Pos + 0 * vertexStride)) -= vec[0] + vec[1];
-        // BL
-        *((SkPoint*)((intptr_t)fan1Pos + 1 * vertexStride)) =
-            *((SkPoint*)((intptr_t)fan0Pos + 1 * vertexStride)) + vec[0] - vec[1];
-        *((SkPoint*)((intptr_t)fan0Pos + 1 * vertexStride)) -= vec[0] - vec[1];
-        // BR
-        *((SkPoint*)((intptr_t)fan1Pos + 2 * vertexStride)) =
-            *((SkPoint*)((intptr_t)fan0Pos + 2 * vertexStride)) - vec[0] - vec[1];
-        *((SkPoint*)((intptr_t)fan0Pos + 2 * vertexStride)) += vec[0] + vec[1];
-        // TR
-        *((SkPoint*)((intptr_t)fan1Pos + 3 * vertexStride)) =
-            *((SkPoint*)((intptr_t)fan0Pos + 3 * vertexStride)) - vec[0] + vec[1];
-        *((SkPoint*)((intptr_t)fan0Pos + 3 * vertexStride)) += vec[0] - vec[1];
-    }
-
-    // Make verts point to vertex color and then set all the color and coverage vertex attrs
-    // values.
-    verts += sizeof(SkPoint);
-    for (int i = 0; i < 4; ++i) {
-        if (tweakAlphaForCoverage) {
-            *reinterpret_cast<GrColor*>(verts + i * vertexStride) = 0;
-        } else {
-            *reinterpret_cast<GrColor*>(verts + i * vertexStride) = color;
-            *reinterpret_cast<float*>(verts + i * vertexStride + sizeof(GrColor)) = 0;
-        }
-    }
-
-    int scale;
-    if (inset < SK_ScalarHalf) {
-        scale = SkScalarFloorToInt(512.0f * inset / (inset + SK_ScalarHalf));
-        SkASSERT(scale >= 0 && scale <= 255);
-    } else {
-        scale = 0xff;
-    }
-
-    verts += 4 * vertexStride;
-
-    float innerCoverage = GrNormalizeByteToFloat(scale);
-    GrColor scaledColor = (0xff == scale) ? color : SkAlphaMulQ(color, scale);
-
-    for (int i = 0; i < 4; ++i) {
-        if (tweakAlphaForCoverage) {
-            *reinterpret_cast<GrColor*>(verts + i * vertexStride) = scaledColor;
-        } else {
-            *reinterpret_cast<GrColor*>(verts + i * vertexStride) = color;
-            *reinterpret_cast<float*>(verts + i * vertexStride +
-                                      sizeof(GrColor)) = innerCoverage;
-        }
-    }
-}
+};
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 
 #ifdef GR_TEST_UTILS
 
 #include "GrBatchTest.h"
 
 BATCH_TEST_DEFINE(AAFillRectBatch) {
-    GrAAFillRectBatch::Geometry geo;
-    geo.fColor = GrRandomColor(random);
-    geo.fViewMatrix = GrTest::TestMatrix(random);
-    geo.fRect = GrTest::TestRect(random);
-    geo.fDevRect = GrTest::TestRect(random);
-    return GrAAFillRectBatch::Create(geo);
+    GrColor color = GrRandomColor(random);
+    SkMatrix viewMatrix = GrTest::TestMatrix(random);
+    SkRect rect = GrTest::TestRect(random);
+    SkRect devRect = GrTest::TestRect(random);
+    return AAFillRectBatch::Create(color, viewMatrix, rect, devRect);
 }
 
 #endif