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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];
}
// Allow all hairlines and all miters, so long as the miter limit doesn't produce beveled corners.
inline static bool allowed_stroke(const SkStrokeRec& stroke) {
SkASSERT(stroke.getStyle() == SkStrokeRec::kStroke_Style ||
stroke.getStyle() == SkStrokeRec::kHairline_Style);
return !stroke.getWidth() ||
(stroke.getJoin() == SkPaint::kMiter_Join && stroke.getMiter() > SK_ScalarSqrt2);
}
class NonAAStrokeRectBatch : public GrVertexBatch {
public:
DEFINE_BATCH_CLASS_ID
const char* name() const override { return "NonAAStrokeRectBatch"; }
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(fColor);
coverage->setKnownSingleComponent(0xff);
}
static GrDrawBatch* Create(GrColor color, const SkMatrix& viewMatrix, const SkRect& rect,
const SkStrokeRec& stroke, bool snapToPixelCenters) {
if (!allowed_stroke(stroke)) {
return nullptr;
}
NonAAStrokeRectBatch* batch = new NonAAStrokeRectBatch();
batch->fColor = color;
batch->fViewMatrix = viewMatrix;
batch->fRect = rect;
// Sort the rect for hairlines
batch->fRect.sort();
batch->fStrokeWidth = stroke.getWidth();
SkScalar rad = SkScalarHalf(batch->fStrokeWidth);
SkRect bounds = rect;
bounds.outset(rad, rad);
// If our caller snaps to pixel centers then we have to round out the bounds
if (snapToPixelCenters) {
viewMatrix.mapRect(&bounds);
// We want to be consistent with how we snap non-aa lines. To match what we do in
// GrGLSLVertexShaderBuilder, we first floor all the vertex values and then add half a
// pixel to force us to pixel centers.
bounds.set(SkScalarFloorToScalar(bounds.fLeft),
SkScalarFloorToScalar(bounds.fTop),
SkScalarFloorToScalar(bounds.fRight),
SkScalarFloorToScalar(bounds.fBottom));
bounds.offset(0.5f, 0.5f);
batch->setBounds(bounds, HasAABloat::kNo, IsZeroArea::kNo);
} else {
batch->setTransformedBounds(bounds, batch->fViewMatrix, HasAABloat ::kNo,
IsZeroArea::kNo);
}
return batch;
}
private:
NonAAStrokeRectBatch() : INHERITED(ClassID()) {}
void onPrepareDraws(Target* target) const override {
sk_sp<GrGeometryProcessor> gp;
{
using namespace GrDefaultGeoProcFactory;
Color color(fColor);
Coverage coverage(fOverrides.readsCoverage() ? Coverage::kSolid_Type
: Coverage::kNone_Type);
LocalCoords localCoords(fOverrides.readsLocalCoords() ? LocalCoords::kUsePosition_Type :
LocalCoords::kUnused_Type);
gp = GrDefaultGeoProcFactory::Make(color, coverage, localCoords, fViewMatrix);
}
size_t vertexStride = gp->getVertexStride();
SkASSERT(vertexStride == sizeof(GrDefaultGeoProcFactory::PositionAttr));
int vertexCount = kVertsPerHairlineRect;
if (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 (fStrokeWidth > 0) {
primType = kTriangleStrip_GrPrimitiveType;
init_stroke_rect_strip(vertex, fRect, fStrokeWidth);
} else {
// hairline
primType = kLineStrip_GrPrimitiveType;
vertex[0].set(fRect.fLeft, fRect.fTop);
vertex[1].set(fRect.fRight, fRect.fTop);
vertex[2].set(fRect.fRight, fRect.fBottom);
vertex[3].set(fRect.fLeft, fRect.fBottom);
vertex[4].set(fRect.fLeft, fRect.fTop);
}
GrMesh mesh;
mesh.init(primType, vertexBuffer, firstVertex, vertexCount);
target->draw(gp.get(), mesh);
}
void initBatchTracker(const GrXPOverridesForBatch& overrides) override {
overrides.getOverrideColorIfSet(&fColor);
fOverrides = overrides;
}
bool onCombineIfPossible(GrBatch* t, const GrCaps&) override {
// NonAA stroke rects cannot batch right now
// TODO make these batchable
return false;
}
GrColor fColor;
SkMatrix fViewMatrix;
SkRect fRect;
SkScalar fStrokeWidth;
GrXPOverridesForBatch fOverrides;
const static int kVertsPerHairlineRect = 5;
const static int kVertsPerStrokeRect = 10;
typedef GrVertexBatch INHERITED;
};
namespace GrNonAAStrokeRectBatch {
GrDrawBatch* Create(GrColor color,
const SkMatrix& viewMatrix,
const SkRect& rect,
const SkStrokeRec& stroke,
bool snapToPixelCenters) {
return NonAAStrokeRectBatch::Create(color, viewMatrix, rect, stroke, 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 : 2.0f;
SkPaint paint;
paint.setStrokeWidth(strokeWidth);
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeJoin(SkPaint::kMiter_Join);
SkStrokeRec strokeRec(paint);
return GrNonAAStrokeRectBatch::Create(color, viewMatrix, rect, strokeRec, random->nextBool());
}
#endif
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