move Stroke Rect and AAFill Rect to their own file

src/gpu/batches/GrAAStrokeRectBatch.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 "GrAAStrokeRectBatch.h"
+
+#include "GrDefaultGeoProcFactory.h"
+#include "GrResourceKey.h"
+#include "GrResourceProvider.h"
+
+GR_DECLARE_STATIC_UNIQUE_KEY(gMiterIndexBufferKey);
+GR_DECLARE_STATIC_UNIQUE_KEY(gBevelIndexBufferKey);
+
+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_stroke_rect_gp(bool tweakAlphaForCoverage,
+                                                        const SkMatrix& viewMatrix,
+                                                        bool usesLocalCoords,
+                                                        bool coverageIgnored) {
+    using namespace GrDefaultGeoProcFactory;
+
+    Color color(Color::kAttribute_Type);
+    Coverage::Type coverageType;
+    // TODO remove coverage if coverage is ignored
+    /*if (coverageIgnored) {
+        coverageType = Coverage::kNone_Type;
+    } else*/ if (tweakAlphaForCoverage) {
+        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 GrAAStrokeRectBatch::initBatchTracker(const GrPipelineInfo& init) {
+    // Handle any color overrides
+    if (!init.readsColor()) {
+        fGeoData[0].fColor = GrColor_ILLEGAL;
+    }
+    init.getOverrideColorIfSet(&fGeoData[0].fColor);
+
+    // setup batch properties
+    fBatch.fColorIgnored = !init.readsColor();
+    fBatch.fColor = fGeoData[0].fColor;
+    fBatch.fUsesLocalCoords = init.readsLocalCoords();
+    fBatch.fCoverageIgnored = !init.readsCoverage();
+    fBatch.fMiterStroke = fGeoData[0].fMiterStroke;
+    fBatch.fCanTweakAlphaForCoverage = init.canTweakAlphaForCoverage();
+}
+
+void GrAAStrokeRectBatch::generateGeometry(GrBatchTarget* batchTarget) {
+    bool canTweakAlphaForCoverage = this->canTweakAlphaForCoverage();
+
+    SkAutoTUnref<const GrGeometryProcessor> gp(create_stroke_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 innerVertexNum = 4;
+    int outerVertexNum = this->miterStroke() ? 4 : 8;
+    int verticesPerInstance = (outerVertexNum + innerVertexNum) * 2;
+    int indicesPerInstance = this->miterStroke() ? kMiterIndexCnt : kBevelIndexCnt;
+    int instanceCount = fGeoData.count();
+
+    const SkAutoTUnref<const GrIndexBuffer> indexBuffer(
+        GetIndexBuffer(batchTarget->resourceProvider(), this->miterStroke()));
+    InstancedHelper helper;
+    void* vertices = helper.init(batchTarget, kTriangles_GrPrimitiveType, vertexStride,
+                                 indexBuffer, verticesPerInstance,  indicesPerInstance,
+                                 instanceCount);
+    if (!vertices || !indexBuffer) {
+         SkDebugf("Could not allocate vertices\n");
+         return;
+     }
+
+    for (int i = 0; i < instanceCount; i++) {
+        const Geometry& args = fGeoData[i];
+        this->generateAAStrokeRectGeometry(vertices,
+                                           i * verticesPerInstance * vertexStride,
+                                           vertexStride,
+                                           outerVertexNum,
+                                           innerVertexNum,
+                                           args.fColor,
+                                           args.fDevOutside,
+                                           args.fDevOutsideAssist,
+                                           args.fDevInside,
+                                           args.fMiterStroke,
+                                           canTweakAlphaForCoverage);
+    }
+    helper.issueDraw(batchTarget);
+}
+
+const GrIndexBuffer* GrAAStrokeRectBatch::GetIndexBuffer(GrResourceProvider* resourceProvider,
+                                                         bool miterStroke) {
+
+    if (miterStroke) {
+        static const uint16_t gMiterIndices[] = {
+            0 + 0, 1 + 0, 5 + 0, 5 + 0, 4 + 0, 0 + 0,
+            1 + 0, 2 + 0, 6 + 0, 6 + 0, 5 + 0, 1 + 0,
+            2 + 0, 3 + 0, 7 + 0, 7 + 0, 6 + 0, 2 + 0,
+            3 + 0, 0 + 0, 4 + 0, 4 + 0, 7 + 0, 3 + 0,
+
+            0 + 4, 1 + 4, 5 + 4, 5 + 4, 4 + 4, 0 + 4,
+            1 + 4, 2 + 4, 6 + 4, 6 + 4, 5 + 4, 1 + 4,
+            2 + 4, 3 + 4, 7 + 4, 7 + 4, 6 + 4, 2 + 4,
+            3 + 4, 0 + 4, 4 + 4, 4 + 4, 7 + 4, 3 + 4,
+
+            0 + 8, 1 + 8, 5 + 8, 5 + 8, 4 + 8, 0 + 8,
+            1 + 8, 2 + 8, 6 + 8, 6 + 8, 5 + 8, 1 + 8,
+            2 + 8, 3 + 8, 7 + 8, 7 + 8, 6 + 8, 2 + 8,
+            3 + 8, 0 + 8, 4 + 8, 4 + 8, 7 + 8, 3 + 8,
+        };
+        GR_STATIC_ASSERT(SK_ARRAY_COUNT(gMiterIndices) == kMiterIndexCnt);
+        GR_DEFINE_STATIC_UNIQUE_KEY(gMiterIndexBufferKey);
+        return resourceProvider->findOrCreateInstancedIndexBuffer(gMiterIndices,
+            kMiterIndexCnt, kNumMiterRectsInIndexBuffer, kMiterVertexCnt,
+            gMiterIndexBufferKey);
+    } else {
+        /**
+         * As in miter-stroke, index = a + b, and a is the current index, b is the shift
+         * from the first index. The index layout:
+         * outer AA line: 0~3, 4~7
+         * outer edge:    8~11, 12~15
+         * inner edge:    16~19
+         * inner AA line: 20~23
+         * Following comes a bevel-stroke rect and its indices:
+         *
+         *           4                                 7
+         *            *********************************
+         *          *   ______________________________  *
+         *         *  / 12                          15 \  *
+         *        *  /                                  \  *
+         *     0 *  |8     16_____________________19  11 |  * 3
+         *       *  |       |                    |       |  *
+         *       *  |       |  ****************  |       |  *
+         *       *  |       |  * 20        23 *  |       |  *
+         *       *  |       |  *              *  |       |  *
+         *       *  |       |  * 21        22 *  |       |  *
+         *       *  |       |  ****************  |       |  *
+         *       *  |       |____________________|       |  *
+         *     1 *  |9    17                      18   10|  * 2
+         *        *  \                                  /  *
+         *         *  \13 __________________________14/  *
+         *          *                                   *
+         *           **********************************
+         *          5                                  6
+         */
+        static const uint16_t gBevelIndices[] = {
+            // Draw outer AA, from outer AA line to outer edge, shift is 0.
+            0 + 0, 1 + 0,  9 + 0,  9 + 0,  8 + 0, 0 + 0,
+            1 + 0, 5 + 0, 13 + 0, 13 + 0,  9 + 0, 1 + 0,
+            5 + 0, 6 + 0, 14 + 0, 14 + 0, 13 + 0, 5 + 0,
+            6 + 0, 2 + 0, 10 + 0, 10 + 0, 14 + 0, 6 + 0,
+            2 + 0, 3 + 0, 11 + 0, 11 + 0, 10 + 0, 2 + 0,
+            3 + 0, 7 + 0, 15 + 0, 15 + 0, 11 + 0, 3 + 0,
+            7 + 0, 4 + 0, 12 + 0, 12 + 0, 15 + 0, 7 + 0,
+            4 + 0, 0 + 0,  8 + 0,  8 + 0, 12 + 0, 4 + 0,
+
+            // Draw the stroke, from outer edge to inner edge, shift is 8.
+            0 + 8, 1 + 8, 9 + 8, 9 + 8, 8 + 8, 0 + 8,
+            1 + 8, 5 + 8, 9 + 8,
+            5 + 8, 6 + 8, 10 + 8, 10 + 8, 9 + 8, 5 + 8,
+            6 + 8, 2 + 8, 10 + 8,
+            2 + 8, 3 + 8, 11 + 8, 11 + 8, 10 + 8, 2 + 8,
+            3 + 8, 7 + 8, 11 + 8,
+            7 + 8, 4 + 8, 8 + 8, 8 + 8, 11 + 8, 7 + 8,
+            4 + 8, 0 + 8, 8 + 8,
+
+            // Draw the inner AA, from inner edge to inner AA line, shift is 16.
+            0 + 16, 1 + 16, 5 + 16, 5 + 16, 4 + 16, 0 + 16,
+            1 + 16, 2 + 16, 6 + 16, 6 + 16, 5 + 16, 1 + 16,
+            2 + 16, 3 + 16, 7 + 16, 7 + 16, 6 + 16, 2 + 16,
+            3 + 16, 0 + 16, 4 + 16, 4 + 16, 7 + 16, 3 + 16,
+        };
+        GR_STATIC_ASSERT(SK_ARRAY_COUNT(gBevelIndices) == kBevelIndexCnt);
+
+        GR_DEFINE_STATIC_UNIQUE_KEY(gBevelIndexBufferKey);
+        return resourceProvider->findOrCreateInstancedIndexBuffer(gBevelIndices,
+            kBevelIndexCnt, kNumBevelRectsInIndexBuffer, kBevelVertexCnt,
+            gBevelIndexBufferKey);
+    }
+}
+
+bool GrAAStrokeRectBatch::onCombineIfPossible(GrBatch* t) {
+    if (!this->pipeline()->isEqual(*t->pipeline())) {
+        return false;
+    }
+
+    GrAAStrokeRectBatch* that = t->cast<GrAAStrokeRectBatch>();
+
+    // TODO batch across miterstroke changes
+    if (this->miterStroke() != that->miterStroke()) {
+        return false;
+    }
+
+    // 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;
+    }
+
+    // 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;
+    }
+
+    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;
+}
+
+void GrAAStrokeRectBatch::generateAAStrokeRectGeometry(void* vertices,
+                                                       size_t offset,
+                                                       size_t vertexStride,
+                                                       int outerVertexNum,
+                                                       int innerVertexNum,
+                                                       GrColor color,
+                                                       const SkRect& devOutside,
+                                                       const SkRect& devOutsideAssist,
+                                                       const SkRect& devInside,
+                                                       bool miterStroke,
+                                                       bool tweakAlphaForCoverage) const {
+    intptr_t verts = reinterpret_cast<intptr_t>(vertices) + offset;
+
+    // We create vertices for four nested rectangles. There are two ramps from 0 to full
+    // coverage, one on the exterior of the stroke and the other on the interior.
+    // The following pointers refer to the four rects, from outermost to innermost.
+    SkPoint* fan0Pos = reinterpret_cast<SkPoint*>(verts);
+    SkPoint* fan1Pos = reinterpret_cast<SkPoint*>(verts + outerVertexNum * vertexStride);
+    SkPoint* fan2Pos = reinterpret_cast<SkPoint*>(verts + 2 * outerVertexNum * vertexStride);
+    SkPoint* fan3Pos = reinterpret_cast<SkPoint*>(verts +
+                                                  (2 * outerVertexNum + innerVertexNum) *
+                                                  vertexStride);
+
+#ifndef SK_IGNORE_THIN_STROKED_RECT_FIX
+    // TODO: this only really works if the X & Y margins are the same all around
+    // the rect (or if they are all >= 1.0).
+    SkScalar inset = SkMinScalar(SK_Scalar1, devOutside.fRight - devInside.fRight);
+    inset = SkMinScalar(inset, devInside.fLeft - devOutside.fLeft);
+    inset = SkMinScalar(inset, devInside.fTop - devOutside.fTop);
+    if (miterStroke) {
+        inset = SK_ScalarHalf * SkMinScalar(inset, devOutside.fBottom - devInside.fBottom);
+    } else {
+        inset = SK_ScalarHalf * SkMinScalar(inset, devOutsideAssist.fBottom -
+                                                   devInside.fBottom);
+    }
+    SkASSERT(inset >= 0);
+#else
+    SkScalar inset = SK_ScalarHalf;
+#endif
+
+    if (miterStroke) {
+        // outermost
+        set_inset_fan(fan0Pos, vertexStride, devOutside, -SK_ScalarHalf, -SK_ScalarHalf);
+        // inner two
+        set_inset_fan(fan1Pos, vertexStride, devOutside,  inset,  inset);
+        set_inset_fan(fan2Pos, vertexStride, devInside,  -inset, -inset);
+        // innermost
+        set_inset_fan(fan3Pos, vertexStride, devInside,   SK_ScalarHalf,  SK_ScalarHalf);
+    } else {
+        SkPoint* fan0AssistPos = reinterpret_cast<SkPoint*>(verts + 4 * vertexStride);
+        SkPoint* fan1AssistPos = reinterpret_cast<SkPoint*>(verts +
+                                                            (outerVertexNum + 4) *
+                                                            vertexStride);
+        // outermost
+        set_inset_fan(fan0Pos, vertexStride, devOutside, -SK_ScalarHalf, -SK_ScalarHalf);
+        set_inset_fan(fan0AssistPos, vertexStride, devOutsideAssist, -SK_ScalarHalf,
+                      -SK_ScalarHalf);
+        // outer one of the inner two
+        set_inset_fan(fan1Pos, vertexStride, devOutside,  inset,  inset);
+        set_inset_fan(fan1AssistPos, vertexStride, devOutsideAssist,  inset,  inset);
+        // inner one of the inner two
+        set_inset_fan(fan2Pos, vertexStride, devInside,  -inset, -inset);
+        // innermost
+        set_inset_fan(fan3Pos, vertexStride, devInside,   SK_ScalarHalf,  SK_ScalarHalf);
+    }
+
+    // Make verts point to vertex color and then set all the color and coverage vertex attrs
+    // values. The outermost rect has 0 coverage
+    verts += sizeof(SkPoint);
+    for (int i = 0; i < outerVertexNum; ++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;
+        }
+    }
+
+    // scale is the coverage for the the inner two rects.
+    int scale;
+    if (inset < SK_ScalarHalf) {
+        scale = SkScalarFloorToInt(512.0f * inset / (inset + SK_ScalarHalf));
+        SkASSERT(scale >= 0 && scale <= 255);
+    } else {
+        scale = 0xff;
+    }
+
+    float innerCoverage = GrNormalizeByteToFloat(scale);
+    GrColor scaledColor = (0xff == scale) ? color : SkAlphaMulQ(color, scale);
+
+    verts += outerVertexNum * vertexStride;
+    for (int i = 0; i < outerVertexNum + innerVertexNum; ++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;
+        }
+    }
+
+    // The innermost rect has 0 coverage
+    verts += (outerVertexNum + innerVertexNum) * vertexStride;
+    for (int i = 0; i < innerVertexNum; ++i) {
+        if (tweakAlphaForCoverage) {
+            *reinterpret_cast<GrColor*>(verts + i * vertexStride) = 0;
+        } else {
+            *reinterpret_cast<GrColor*>(verts + i * vertexStride) = color;
+            *reinterpret_cast<GrColor*>(verts + i * vertexStride + sizeof(GrColor)) = 0;
+        }
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+#ifdef GR_TEST_UTILS
+
+#include "GrBatchTest.h"
+
+BATCH_TEST_DEFINE(AAStrokeRectBatch) {
+    bool miterStroke = random->nextBool();
+
+    // Create mock stroke rect
+    SkRect outside = GrTest::TestRect(random);
+    SkScalar minDim = SkMinScalar(outside.width(), outside.height());
+    SkScalar strokeWidth = minDim * 0.1f;
+    SkRect outsideAssist = outside;
+    outsideAssist.outset(strokeWidth, strokeWidth);
+    SkRect inside = outside;
+    inside.inset(strokeWidth, strokeWidth);
+
+    GrAAStrokeRectBatch::Geometry geo;
+    geo.fColor = GrRandomColor(random);
+    geo.fDevOutside = outside;
+    geo.fDevOutsideAssist = outsideAssist;
+    geo.fDevInside = inside;
+    geo.fMiterStroke = miterStroke;
+
+    return GrAAStrokeRectBatch::Create(geo, GrTest::TestMatrix(random));
+}
+
+#endif