Move RectBatch to GrRect

BUG=skia:

Review URL: https://codereview.chromium.org/1127713002

1 files changed, 251 insertions, 0 deletions

diff --git a/src/gpu/GrRectBatch.cpp b/src/gpu/GrRectBatch.cpp
new file mode 100644
index 0000000000..ba63db1e0f
--- /dev/null
+++ b/src/gpu/GrRectBatch.cpp
@@ -0,0 +1,251 @@
+/*
+ * 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 "GrRectBatch.h"
+
+#include "GrBatch.h"
+#include "GrBatchTarget.h"
+#include "GrDefaultGeoProcFactory.h"
+#include "GrPrimitiveProcessor.h"
+#include "GrTemplates.h"
+
+/** We always use per-vertex colors so that rects can be batched across color changes. Sometimes we
+    have explicit local coords and sometimes not. We *could* always provide explicit local coords
+    and just duplicate the positions when the caller hasn't provided a local coord rect, but we
+    haven't seen a use case which frequently switches between local rect and no local rect draws.
+
+    The color param is used to determine whether the opaque hint can be set on the draw state.
+    The caller must populate the vertex colors itself.
+
+    The vertex attrib order is always pos, color, [local coords].
+ */
+static const GrGeometryProcessor* create_rect_gp(bool hasExplicitLocalCoords,
+                                                 GrColor color,
+                                                 const SkMatrix* localMatrix) {
+    uint32_t flags = GrDefaultGeoProcFactory::kPosition_GPType |
+                     GrDefaultGeoProcFactory::kColor_GPType;
+    flags |= hasExplicitLocalCoords ? GrDefaultGeoProcFactory::kLocalCoord_GPType : 0;
+    if (localMatrix) {
+        return GrDefaultGeoProcFactory::Create(flags, color, SkMatrix::I(), *localMatrix,
+                                               GrColorIsOpaque(color));
+    } else {
+        return GrDefaultGeoProcFactory::Create(flags, color, SkMatrix::I(), SkMatrix::I(),
+                                               GrColorIsOpaque(color));
+    }
+}
+
+class RectBatch : public GrBatch {
+public:
+    struct Geometry {
+        GrColor fColor;
+        SkMatrix fViewMatrix;
+        SkRect fRect;
+        bool fHasLocalRect;
+        bool fHasLocalMatrix;
+        SkRect fLocalRect;
+        SkMatrix fLocalMatrix;
+    };
+
+    static GrBatch* Create(const Geometry& geometry) {
+        return SkNEW_ARGS(RectBatch, (geometry));
+    }
+
+    const char* name() const override { return "RectBatch"; }
+
+    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->setKnownSingleComponent(0xff);
+    }
+
+    void initBatchTracker(const GrPipelineInfo& init) override {
+        // Handle any color overrides
+        if (init.fColorIgnored) {
+            fGeoData[0].fColor = GrColor_ILLEGAL;
+        } else if (GrColor_ILLEGAL != init.fOverrideColor) {
+            fGeoData[0].fColor = init.fOverrideColor;
+        }
+
+        // setup batch properties
+        fBatch.fColorIgnored = init.fColorIgnored;
+        fBatch.fColor = fGeoData[0].fColor;
+        fBatch.fUsesLocalCoords = init.fUsesLocalCoords;
+        fBatch.fCoverageIgnored = init.fCoverageIgnored;
+    }
+
+    void generateGeometry(GrBatchTarget* batchTarget, const GrPipeline* pipeline) override {
+        // Go to device coords to allow batching across matrix changes
+        SkMatrix invert = SkMatrix::I();
+
+        // if we have a local rect, then we apply the localMatrix directly to the localRect to
+        // generate vertex local coords
+        bool hasExplicitLocalCoords = this->hasLocalRect();
+        if (!hasExplicitLocalCoords) {
+            if (!this->viewMatrix().isIdentity() && !this->viewMatrix().invert(&invert)) {
+                SkDebugf("Could not invert\n");
+                return;
+            }
+
+            if (this->hasLocalMatrix()) {
+                invert.preConcat(this->localMatrix());
+            }
+        }
+
+        SkAutoTUnref<const GrGeometryProcessor> gp(create_rect_gp(hasExplicitLocalCoords,
+                                                                  this->color(),
+                                                                  &invert));
+
+        batchTarget->initDraw(gp, pipeline);
+
+        // TODO this is hacky, but the only way we have to initialize the GP is to use the
+        // GrPipelineInfo struct so we can generate the correct shader.  Once we have GrBatch
+        // everywhere we can remove this nastiness
+        GrPipelineInfo init;
+        init.fColorIgnored = fBatch.fColorIgnored;
+        init.fOverrideColor = GrColor_ILLEGAL;
+        init.fCoverageIgnored = fBatch.fCoverageIgnored;
+        init.fUsesLocalCoords = this->usesLocalCoords();
+        gp->initBatchTracker(batchTarget->currentBatchTracker(), init);
+
+        int instanceCount = fGeoData.count();
+        size_t vertexStride = gp->getVertexStride();
+        SkASSERT(hasExplicitLocalCoords ?
+                 vertexStride == sizeof(GrDefaultGeoProcFactory::PositionColorLocalCoordAttr) :
+                 vertexStride == sizeof(GrDefaultGeoProcFactory::PositionColorAttr));
+        QuadHelper helper;
+        void* vertices = helper.init(batchTarget, vertexStride, instanceCount);
+
+        if (!vertices) {
+            return;
+        }
+
+
+        for (int i = 0; i < instanceCount; i++) {
+            const Geometry& geom = fGeoData[i];
+
+            intptr_t offset = GrTCast<intptr_t>(vertices) + kVerticesPerQuad * i * vertexStride;
+            SkPoint* positions = GrTCast<SkPoint*>(offset);
+
+            positions->setRectFan(geom.fRect.fLeft, geom.fRect.fTop,
+                                  geom.fRect.fRight, geom.fRect.fBottom, vertexStride);
+            geom.fViewMatrix.mapPointsWithStride(positions, vertexStride, kVerticesPerQuad);
+
+            if (geom.fHasLocalRect) {
+                static const int kLocalOffset = sizeof(SkPoint) + sizeof(GrColor);
+                SkPoint* coords = GrTCast<SkPoint*>(offset + kLocalOffset);
+                coords->setRectFan(geom.fLocalRect.fLeft, geom.fLocalRect.fTop,
+                                   geom.fLocalRect.fRight, geom.fLocalRect.fBottom,
+                                   vertexStride);
+                if (geom.fHasLocalMatrix) {
+                    geom.fLocalMatrix.mapPointsWithStride(coords, vertexStride, kVerticesPerQuad);
+                }
+            }
+
+            static const int kColorOffset = sizeof(SkPoint);
+            GrColor* vertColor = GrTCast<GrColor*>(offset + kColorOffset);
+            for (int j = 0; j < 4; ++j) {
+                *vertColor = geom.fColor;
+                vertColor = (GrColor*) ((intptr_t) vertColor + vertexStride);
+            }
+        }
+
+        helper.issueDraws(batchTarget);
+    }
+
+    SkSTArray<1, Geometry, true>* geoData() { return &fGeoData; }
+
+private:
+    RectBatch(const Geometry& geometry) {
+        this->initClassID<RectBatch>();
+        fGeoData.push_back(geometry);
+
+        fBounds = geometry.fRect;
+        geometry.fViewMatrix.mapRect(&fBounds);
+    }
+
+    GrColor color() const { return fBatch.fColor; }
+    bool usesLocalCoords() const { return fBatch.fUsesLocalCoords; }
+    bool colorIgnored() const { return fBatch.fColorIgnored; }
+    const SkMatrix& viewMatrix() const { return fGeoData[0].fViewMatrix; }
+    const SkMatrix& localMatrix() const { return fGeoData[0].fLocalMatrix; }
+    bool hasLocalRect() const { return fGeoData[0].fHasLocalRect; }
+    bool hasLocalMatrix() const { return fGeoData[0].fHasLocalMatrix; }
+
+    bool onCombineIfPossible(GrBatch* t) override {
+        RectBatch* that = t->cast<RectBatch>();
+
+        if (this->hasLocalRect() != that->hasLocalRect()) {
+            return false;
+        }
+
+        SkASSERT(this->usesLocalCoords() == that->usesLocalCoords());
+        if (!this->hasLocalRect() && this->usesLocalCoords()) {
+            if (!this->viewMatrix().cheapEqualTo(that->viewMatrix())) {
+                return false;
+            }
+
+            if (this->hasLocalMatrix() != that->hasLocalMatrix()) {
+                return false;
+            }
+
+            if (this->hasLocalMatrix() && !this->localMatrix().cheapEqualTo(that->localMatrix())) {
+                return false;
+            }
+        }
+
+        if (this->color() != that->color()) {
+            fBatch.fColor = GrColor_ILLEGAL;
+        }
+        fGeoData.push_back_n(that->geoData()->count(), that->geoData()->begin());
+        this->joinBounds(that->bounds());
+        return true;
+    }
+
+    struct BatchTracker {
+        GrColor fColor;
+        bool fUsesLocalCoords;
+        bool fColorIgnored;
+        bool fCoverageIgnored;
+    };
+
+    BatchTracker fBatch;
+    SkSTArray<1, Geometry, true> fGeoData;
+};
+
+namespace GrRectBatch {
+
+GrBatch* Create(GrColor color,
+                const SkMatrix& viewMatrix,
+                const SkRect& rect,
+                const SkRect* localRect,
+                const SkMatrix* localMatrix) {
+    RectBatch::Geometry geometry;
+    geometry.fColor = color;
+    geometry.fViewMatrix = viewMatrix;
+    geometry.fRect = rect;
+
+    if (localRect) {
+        geometry.fHasLocalRect = true;
+        geometry.fLocalRect = *localRect;
+    } else {
+        geometry.fHasLocalRect = false;
+    }
+
+    if (localMatrix) {
+        geometry.fHasLocalMatrix = true;
+        geometry.fLocalMatrix = *localMatrix;
+    } else {
+        geometry.fHasLocalMatrix = false;
+    }
+
+    return RectBatch::Create(geometry);
+}
+
+};