move Stroke Rect and AAFill Rect to their own file

BUG=skia:

Review URL: https://codereview.chromium.org/1282723004

1 files changed, 259 insertions, 0 deletions

diff --git a/src/gpu/batches/GrAAFillRectBatch.cpp b/src/gpu/batches/GrAAFillRectBatch.cpp
new file mode 100644
index 0000000000..4ea4908d03
--- /dev/null
+++ b/src/gpu/batches/GrAAFillRectBatch.cpp
@@ -0,0 +1,259 @@
+/*
+ * 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 "GrDefaultGeoProcFactory.h"
+#include "GrResourceKey.h"
+#include "GrResourceProvider.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,
+                                                      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 GrAAFillRectBatch::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.fCanTweakAlphaForCoverage = init.canTweakAlphaForCoverage();
+}
+
+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);
+}
+
+#endif