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/*
* 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 "GrNonAAStrokeRectBatch.h"
#include "GrBatchTest.h"
#include "GrBatchFlushState.h"
#include "GrColor.h"
#include "GrDefaultGeoProcFactory.h"
#include "GrVertexBatch.h"
#include "SkRandom.h"
/* create a triangle strip that strokes the specified rect. There are 8
unique vertices, but we repeat the last 2 to close up. Alternatively we
could use an indices array, and then only send 8 verts, but not sure that
would be faster.
*/
static void init_stroke_rect_strip(SkPoint verts[10], const SkRect& rect, SkScalar width) {
const SkScalar rad = SkScalarHalf(width);
// TODO we should be able to enable this assert, but we'd have to filter these draws
// this is a bug
//SkASSERT(rad < rect.width() / 2 && rad < rect.height() / 2);
verts[0].set(rect.fLeft + rad, rect.fTop + rad);
verts[1].set(rect.fLeft - rad, rect.fTop - rad);
verts[2].set(rect.fRight - rad, rect.fTop + rad);
verts[3].set(rect.fRight + rad, rect.fTop - rad);
verts[4].set(rect.fRight - rad, rect.fBottom - rad);
verts[5].set(rect.fRight + rad, rect.fBottom + rad);
verts[6].set(rect.fLeft + rad, rect.fBottom - rad);
verts[7].set(rect.fLeft - rad, rect.fBottom + rad);
verts[8] = verts[0];
verts[9] = verts[1];
}
class NonAAStrokeRectBatch : public GrVertexBatch {
public:
DEFINE_BATCH_CLASS_ID
struct Geometry {
SkMatrix fViewMatrix;
SkRect fRect;
SkScalar fStrokeWidth;
GrColor fColor;
};
static NonAAStrokeRectBatch* Create() {
return new NonAAStrokeRectBatch;
}
const char* name() const override { return "GrStrokeRectBatch"; }
void computePipelineOptimizations(GrInitInvariantOutput* color,
GrInitInvariantOutput* coverage,
GrBatchToXPOverrides* overrides) const override {
// When this is called on a batch, there is only one geometry bundle
color->setKnownFourComponents(fGeoData[0].fColor);
coverage->setKnownSingleComponent(0xff);
}
void append(GrColor color, const SkMatrix& viewMatrix, const SkRect& rect,
SkScalar strokeWidth) {
Geometry& geometry = fGeoData.push_back();
geometry.fViewMatrix = viewMatrix;
geometry.fRect = rect;
geometry.fStrokeWidth = strokeWidth;
geometry.fColor = color;
// Sort the rect for hairlines
geometry.fRect.sort();
}
void appendAndUpdateBounds(GrColor color, const SkMatrix& viewMatrix, const SkRect& rect,
SkScalar strokeWidth, bool snapToPixelCenters) {
this->append(color, viewMatrix, rect, strokeWidth);
SkRect bounds;
this->setupBounds(&bounds, fGeoData.back(), snapToPixelCenters);
this->joinBounds(bounds);
}
void init(bool snapToPixelCenters) {
const Geometry& geo = fGeoData[0];
fBatch.fHairline = geo.fStrokeWidth == 0;
// setup bounds
this->setupBounds(&fBounds, geo, snapToPixelCenters);
}
private:
void setupBounds(SkRect* bounds, const Geometry& geo, bool snapToPixelCenters) {
*bounds = geo.fRect;
SkScalar rad = SkScalarHalf(geo.fStrokeWidth);
bounds->outset(rad, rad);
geo.fViewMatrix.mapRect(&fBounds);
// If our caller snaps to pixel centers then we have to round out the bounds
if (snapToPixelCenters) {
bounds->roundOut();
}
}
void onPrepareDraws(Target* target) const override {
SkAutoTUnref<const GrGeometryProcessor> gp;
{
using namespace GrDefaultGeoProcFactory;
Color color(this->color());
Coverage coverage(this->coverageIgnored() ? Coverage::kSolid_Type :
Coverage::kNone_Type);
LocalCoords localCoords(this->usesLocalCoords() ? LocalCoords::kUsePosition_Type :
LocalCoords::kUnused_Type);
gp.reset(GrDefaultGeoProcFactory::Create(color, coverage, localCoords,
this->viewMatrix()));
}
target->initDraw(gp);
size_t vertexStride = gp->getVertexStride();
SkASSERT(vertexStride == sizeof(GrDefaultGeoProcFactory::PositionAttr));
const Geometry& args = fGeoData[0];
int vertexCount = kVertsPerHairlineRect;
if (args.fStrokeWidth > 0) {
vertexCount = kVertsPerStrokeRect;
}
const GrBuffer* vertexBuffer;
int firstVertex;
void* verts = target->makeVertexSpace(vertexStride, vertexCount, &vertexBuffer,
&firstVertex);
if (!verts) {
SkDebugf("Could not allocate vertices\n");
return;
}
SkPoint* vertex = reinterpret_cast<SkPoint*>(verts);
GrPrimitiveType primType;
if (args.fStrokeWidth > 0) {
primType = kTriangleStrip_GrPrimitiveType;
init_stroke_rect_strip(vertex, args.fRect, args.fStrokeWidth);
} else {
// hairline
primType = kLineStrip_GrPrimitiveType;
vertex[0].set(args.fRect.fLeft, args.fRect.fTop);
vertex[1].set(args.fRect.fRight, args.fRect.fTop);
vertex[2].set(args.fRect.fRight, args.fRect.fBottom);
vertex[3].set(args.fRect.fLeft, args.fRect.fBottom);
vertex[4].set(args.fRect.fLeft, args.fRect.fTop);
}
GrMesh mesh;
mesh.init(primType, vertexBuffer, firstVertex, vertexCount);
target->draw(mesh);
}
void initBatchTracker(const GrXPOverridesForBatch& overrides) override {
// Handle any color overrides
if (!overrides.readsColor()) {
fGeoData[0].fColor = GrColor_ILLEGAL;
}
overrides.getOverrideColorIfSet(&fGeoData[0].fColor);
// setup batch properties
fBatch.fColorIgnored = !overrides.readsColor();
fBatch.fColor = fGeoData[0].fColor;
fBatch.fUsesLocalCoords = overrides.readsLocalCoords();
fBatch.fCoverageIgnored = !overrides.readsCoverage();
}
NonAAStrokeRectBatch() : INHERITED(ClassID()) {}
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; }
bool hairline() const { return fBatch.fHairline; }
bool coverageIgnored() const { return fBatch.fCoverageIgnored; }
bool onCombineIfPossible(GrBatch* t, const GrCaps&) override {
// if (!GrPipeline::CanCombine(*this->pipeline(), this->bounds(), *t->pipeline(),
// t->bounds(), caps)) {
// return false;
// }
// GrStrokeRectBatch* that = t->cast<StrokeRectBatch>();
// NonAA stroke rects cannot batch right now
// TODO make these batchable
return false;
}
struct BatchTracker {
GrColor fColor;
bool fUsesLocalCoords;
bool fColorIgnored;
bool fCoverageIgnored;
bool fHairline;
};
const static int kVertsPerHairlineRect = 5;
const static int kVertsPerStrokeRect = 10;
BatchTracker fBatch;
SkSTArray<1, Geometry, true> fGeoData;
typedef GrVertexBatch INHERITED;
};
namespace GrNonAAStrokeRectBatch {
GrDrawBatch* Create(GrColor color,
const SkMatrix& viewMatrix,
const SkRect& rect,
SkScalar strokeWidth,
bool snapToPixelCenters) {
NonAAStrokeRectBatch* batch = NonAAStrokeRectBatch::Create();
batch->append(color, viewMatrix, rect, strokeWidth);
batch->init(snapToPixelCenters);
return batch;
}
void Append(GrBatch* origBatch,
GrColor color,
const SkMatrix& viewMatrix,
const SkRect& rect,
SkScalar strokeWidth,
bool snapToPixelCenters) {
NonAAStrokeRectBatch* batch = origBatch->cast<NonAAStrokeRectBatch>();
batch->appendAndUpdateBounds(color, viewMatrix, rect, strokeWidth, snapToPixelCenters);
}
};
#ifdef GR_TEST_UTILS
DRAW_BATCH_TEST_DEFINE(NonAAStrokeRectBatch) {
SkMatrix viewMatrix = GrTest::TestMatrix(random);
GrColor color = GrRandomColor(random);
SkRect rect = GrTest::TestRect(random);
SkScalar strokeWidth = random->nextBool() ? 0.0f : 1.0f;
return GrNonAAStrokeRectBatch::Create(color, viewMatrix, rect, strokeWidth, random->nextBool());
}
#endif
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