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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 "GrStrokeRectBatch.h"
#include "GrBatchTest.h"
#include "GrBatchFlushState.h"
#include "SkRandom.h"
GrStrokeRectBatch::GrStrokeRectBatch(const Geometry& geometry, bool snapToPixelCenters) {
this->initClassID<GrStrokeRectBatch>();
fBatch.fHairline = geometry.fStrokeWidth == 0;
fGeoData.push_back(geometry);
// setup bounds
fBounds = geometry.fRect;
SkScalar rad = SkScalarHalf(geometry.fStrokeWidth);
fBounds.outset(rad, rad);
geometry.fViewMatrix.mapRect(&fBounds);
// If our caller snaps to pixel centers then we have to round out the bounds
if (snapToPixelCenters) {
fBounds.roundOut();
}
}
void GrStrokeRectBatch::initBatchTracker(const GrPipelineOptimizations& opt) {
// Handle any color overrides
if (!opt.readsColor()) {
fGeoData[0].fColor = GrColor_ILLEGAL;
}
opt.getOverrideColorIfSet(&fGeoData[0].fColor);
// setup batch properties
fBatch.fColorIgnored = !opt.readsColor();
fBatch.fColor = fGeoData[0].fColor;
fBatch.fUsesLocalCoords = opt.readsLocalCoords();
fBatch.fCoverageIgnored = !opt.readsCoverage();
}
/* 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];
}
void GrStrokeRectBatch::onPrepareDraws(Target* target) {
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, this->pipeline());
size_t vertexStride = gp->getVertexStride();
SkASSERT(vertexStride == sizeof(GrDefaultGeoProcFactory::PositionAttr));
Geometry& args = fGeoData[0];
int vertexCount = kVertsPerHairlineRect;
if (args.fStrokeWidth > 0) {
vertexCount = kVertsPerStrokeRect;
}
const GrVertexBuffer* 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;
args.fRect.sort();
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);
}
GrVertices vertices;
vertices.init(primType, vertexBuffer, firstVertex, vertexCount);
target->draw(vertices);
}
#ifdef GR_TEST_UTILS
DRAW_BATCH_TEST_DEFINE(GrStrokeRectBatch) {
GrStrokeRectBatch::Geometry geometry;
geometry.fViewMatrix = GrTest::TestMatrix(random);
geometry.fColor = GrRandomColor(random);
geometry.fRect = GrTest::TestRect(random);
geometry.fStrokeWidth = random->nextBool() ? 0.0f : 1.0f;
return GrStrokeRectBatch::Create(geometry, random->nextBool());
}
#endif
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