GrPathRangeBatch

src/gpu/batches/GrDrawPathBatch.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 "GrDrawPathBatch.h"
+
+SkString GrDrawPathBatch::dumpInfo() const {
+    SkString string;
+    string.printf("PATH: 0x%p", fPath.get());
+    return string;
+}
+
+void GrDrawPathBatch::onDraw(GrBatchFlushState* state) {
+    GrProgramDesc  desc;
+    state->gpu()->buildProgramDesc(&desc, *this->pathProcessor(),
+                                    *this->pipeline(), *this->tracker());
+    GrPathRendering::DrawPathArgs args(this->pathProcessor(), this->pipeline(),
+                                        &desc, this->tracker(), &this->stencilSettings());
+    state->gpu()->pathRendering()->drawPath(args, fPath.get());
+}
+
+GrDrawPathRangeBatch::~GrDrawPathRangeBatch() {
+    for (DrawList::Iter iter(fDraws); iter.get(); iter.next()) {
+        (*iter.get())->unref();
+    }
+}
+
+SkString GrDrawPathRangeBatch::dumpInfo() const {
+    SkString string;
+    string.printf("RANGE: 0x%p COUNTS: [", *fDraws.head());
+    for (DrawList::Iter iter(fDraws); iter.get(); iter.next()) {
+        string.appendf("%d ,", (*iter.get())->count());
+    }
+    string.remove(string.size() - 2, 2);
+    string.append("]");
+    return string;
+}
+
+bool GrDrawPathRangeBatch::isWinding() const {
+    static const GrStencilSettings::Face pathFace = GrStencilSettings::kFront_Face;
+    bool isWinding = kInvert_StencilOp != this->stencilSettings().passOp(pathFace);
+    if (isWinding) {
+        // Double check that it is in fact winding.
+        SkASSERT(kIncClamp_StencilOp == this->stencilSettings().passOp(pathFace));
+        SkASSERT(kIncClamp_StencilOp == this->stencilSettings().failOp(pathFace));
+        SkASSERT(0x1 != this->stencilSettings().writeMask(pathFace));
+        SkASSERT(!this->stencilSettings().isTwoSided());
+    }
+    return isWinding;
+}
+
+GrDrawPathRangeBatch::GrDrawPathRangeBatch(const GrPathProcessor* pathProc,
+                                           GrPathRangeDraw* pathRangeDraw)
+    : INHERITED(pathProc)
+    , fDraws(4) {
+    SkDEBUGCODE(pathRangeDraw->fUsedInBatch = true;)
+    this->initClassID<GrDrawPathRangeBatch>();
+    fDraws.addToHead(SkRef(pathRangeDraw));
+    fTotalPathCount = pathRangeDraw->count();
+    // Don't compute a bounding box. For dst copy texture, we'll opt instead for it to just copy
+    // the entire dst. Realistically this is a moot point, because any context that supports
+    // NV_path_rendering will also support NV_blend_equation_advanced.
+    // For clipping we'll just skip any optimizations based on the bounds.
+    fBounds.setLargest();

[joshualitt, 2015/09/09 13:44:39]

this does mean no out of order batching, but its probably fine.

+}
+
+bool GrDrawPathRangeBatch::onCombineIfPossible(GrBatch* t, const GrCaps& caps) {
+    GrDrawPathRangeBatch* that = t->cast<GrDrawPathRangeBatch>();
+    if (!GrPathRangeDraw::CanMerge(**this->fDraws.head(), **that->fDraws.head())) {
+        return false;
+    }
+    if (!GrPipeline::AreEqual(*this->pipeline(), *that->pipeline(), false)) {
+        return false;
+    }
+    if (!this->pathProcessor()->isEqual(*this->tracker(), *that->pathProcessor(),
+                                        *that->tracker())) {
+        return false;
+    }
+    // TODO: Check some other things here. (winding, opaque, pathProc color, vm, ...)
+    // Try to combine this call with the previous DrawPaths. We do this by stenciling all the
+    // paths together and then covering them in a single pass. This is not equivalent to two
+    // separate draw calls, so we can only do it if there is no blending (no overlap would also
+    // work). Note that it's also possible for overlapping paths to cancel each other's winding
+    // numbers, and we only partially account for this by not allowing even/odd paths to be
+    // combined. (Glyphs in the same font tend to wind the same direction so it works out OK.)
+    if (!this->isWinding() ||
+        this->stencilSettings() != that->stencilSettings() ||
+        this->opts().willColorBlendWithDst()) {
+        return false;
+    }
+    SkASSERT(!that->opts().willColorBlendWithDst());
+    fTotalPathCount += that->fTotalPathCount;
+    while (GrPathRangeDraw** head = that->fDraws.head()) {
+        fDraws.addToTail(*head);
+        // We're stealing that's refs, so pop without unreffing.
+        that->fDraws.popHead();
+    }
+    return true;
+}
+
+void GrDrawPathRangeBatch::onDraw(GrBatchFlushState* state) {
+    GrProgramDesc  desc;
+    state->gpu()->buildProgramDesc(&desc, *this->pathProcessor(), *this->pipeline(),
+                                    *this->tracker());
+    GrPathRendering::DrawPathArgs args(this->pathProcessor(), this->pipeline(),
+                                        &desc, this->tracker(), &this->stencilSettings());
+    if (fDraws.count() == 1) {
+        const GrPathRangeDraw& draw = **fDraws.head();
+        state->gpu()->pathRendering()->drawPaths(args, draw.range(), draw.indices(),
+            GrPathRange::kU16_PathIndexType, draw.transforms(), draw.transformType(),
+            draw.count());
+        return;
+    }
+
+    const GrPathRange* range = (*fDraws.head())->range();
+    GrPathRendering::PathTransformType transformType = (*fDraws.head())->transformType();
+    int floatsPerTransform = GrPathRendering::PathTransformSize(transformType);
+    SkAutoSTMalloc<512, float> transformStorage(floatsPerTransform * fTotalPathCount);
+    SkAutoSTMalloc<256, uint16_t> indexStorage(fTotalPathCount);
+    uint16_t* indices = indexStorage.get();
+    float* transforms = transformStorage.get();
+    for (DrawList::Iter iter(fDraws); iter.get(); iter.next()) {
+        SkASSERT((*iter.get())->transformType() == transformType);
+        SkASSERT((*iter.get())->range() == range);
+        int cnt = (*iter.get())->count();
+        memcpy(indices, (*iter.get())->indices(), cnt * sizeof(uint16_t));
+        indices += cnt;
+        memcpy(transforms, (*iter.get())->transforms(), cnt * floatsPerTransform * sizeof(float));
+        transforms += cnt * floatsPerTransform;
+    }
+    SkASSERT(indices - indexStorage.get() == fTotalPathCount);
+    state->gpu()->pathRendering()->drawPaths(args, range, indexStorage.get(),
+        GrPathRange::kU16_PathIndexType, transformStorage.get(), transformType,
+        fTotalPathCount);
+}