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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrRegionOp.h"
#include "GrDefaultGeoProcFactory.h"
#include "GrMeshDrawOp.h"
#include "GrOpFlushState.h"
#include "GrResourceProvider.h"
#include "SkMatrixPriv.h"
#include "SkRegion.h"
static const int kVertsPerInstance = 4;
static const int kIndicesPerInstance = 6;
static sk_sp<GrGeometryProcessor> make_gp(const SkMatrix& viewMatrix) {
using namespace GrDefaultGeoProcFactory;
return GrDefaultGeoProcFactory::Make(Color::kPremulGrColorAttribute_Type, Coverage::kSolid_Type,
LocalCoords::kUsePosition_Type, viewMatrix);
}
static void tesselate_region(intptr_t vertices,
size_t vertexStride,
GrColor color,
const SkRegion& region) {
SkRegion::Iterator iter(region);
intptr_t verts = vertices;
while (!iter.done()) {
SkRect rect = SkRect::Make(iter.rect());
SkPoint* position = (SkPoint*)verts;
position->setRectFan(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, vertexStride);
static const int kColorOffset = sizeof(SkPoint);
GrColor* vertColor = reinterpret_cast<GrColor*>(verts + kColorOffset);
for (int i = 0; i < kVertsPerInstance; i++) {
*vertColor = color;
vertColor = (GrColor*)((intptr_t)vertColor + vertexStride);
}
verts += vertexStride * kVertsPerInstance;
iter.next();
}
}
class RegionOp final : public GrLegacyMeshDrawOp {
public:
DEFINE_OP_CLASS_ID
RegionOp(GrColor color, const SkMatrix& viewMatrix, const SkRegion& region)
: INHERITED(ClassID()), fViewMatrix(viewMatrix) {
RegionInfo& info = fRegions.push_back();
info.fColor = color;
info.fRegion = region;
SkRect bounds = SkRect::Make(region.getBounds());
this->setTransformedBounds(bounds, viewMatrix, HasAABloat::kNo, IsZeroArea::kNo);
}
const char* name() const override { return "GrRegionOp"; }
SkString dumpInfo() const override {
SkString str;
str.appendf("# combined: %d\n", fRegions.count());
for (int i = 0; i < fRegions.count(); ++i) {
const RegionInfo& info = fRegions[i];
str.appendf("%d: Color: 0x%08x, Region with %d rects\n", i, info.fColor,
info.fRegion.computeRegionComplexity());
}
str.append(DumpPipelineInfo(*this->pipeline()));
str.append(INHERITED::dumpInfo());
return str;
}
private:
void getProcessorAnalysisInputs(GrProcessorAnalysisColor* color,
GrProcessorAnalysisCoverage* coverage) const override {
color->setToConstant(fRegions[0].fColor);
*coverage = GrProcessorAnalysisCoverage::kNone;
}
void applyPipelineOptimizations(const PipelineOptimizations& optimizations) override {
optimizations.getOverrideColorIfSet(&fRegions[0].fColor);
}
void onPrepareDraws(Target* target) const override {
sk_sp<GrGeometryProcessor> gp = make_gp(fViewMatrix);
if (!gp) {
SkDebugf("Couldn't create GrGeometryProcessor\n");
return;
}
SkASSERT(gp->getVertexStride() == sizeof(GrDefaultGeoProcFactory::PositionColorAttr));
int numRegions = fRegions.count();
int numRects = 0;
for (int i = 0; i < numRegions; i++) {
numRects += fRegions[i].fRegion.computeRegionComplexity();
}
size_t vertexStride = gp->getVertexStride();
sk_sp<const GrBuffer> indexBuffer(target->resourceProvider()->refQuadIndexBuffer());
InstancedHelper helper;
void* vertices =
helper.init(target, kTriangles_GrPrimitiveType, vertexStride, indexBuffer.get(),
kVertsPerInstance, kIndicesPerInstance, numRects);
if (!vertices || !indexBuffer) {
SkDebugf("Could not allocate vertices\n");
return;
}
intptr_t verts = reinterpret_cast<intptr_t>(vertices);
for (int i = 0; i < numRegions; i++) {
tesselate_region(verts, vertexStride, fRegions[i].fColor, fRegions[i].fRegion);
int numRectsInRegion = fRegions[i].fRegion.computeRegionComplexity();
verts += numRectsInRegion * kVertsPerInstance * vertexStride;
}
helper.recordDraw(target, gp.get(), this->pipeline());
}
bool onCombineIfPossible(GrOp* t, const GrCaps& caps) override {
RegionOp* that = t->cast<RegionOp>();
if (!GrPipeline::CanCombine(*this->pipeline(), this->bounds(), *that->pipeline(),
that->bounds(), caps)) {
return false;
}
if (fViewMatrix != that->fViewMatrix) {
return false;
}
fRegions.push_back_n(that->fRegions.count(), that->fRegions.begin());
this->joinBounds(*that);
return true;
}
struct RegionInfo {
GrColor fColor;
SkRegion fRegion;
};
SkMatrix fViewMatrix;
SkSTArray<1, RegionInfo, true> fRegions;
typedef GrLegacyMeshDrawOp INHERITED;
};
namespace GrRegionOp {
std::unique_ptr<GrLegacyMeshDrawOp> Make(GrColor color, const SkMatrix& viewMatrix,
const SkRegion& region) {
return std::unique_ptr<GrLegacyMeshDrawOp>(new RegionOp(color, viewMatrix, region));
}
}
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