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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 "GrColor.h"
#include "GrDefaultGeoProcFactory.h"
#include "GrDrawOpTest.h"
#include "GrMeshDrawOp.h"
#include "GrOpFlushState.h"
#include "GrRectOpFactory.h"
#include "GrSimpleMeshDrawOpHelper.h"
#include "SkRandom.h"
#include "SkStrokeRec.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);
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];
// TODO: we should be catching this higher up the call stack and just draw a single
// non-AA rect
if (2*rad >= rect.width()) {
verts[0].fX = verts[2].fX = verts[4].fX = verts[6].fX = verts[8].fX = rect.centerX();
}
if (2*rad >= rect.height()) {
verts[0].fY = verts[2].fY = verts[4].fY = verts[6].fY = verts[8].fY = rect.centerY();
}
}
// 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);
}
namespace {
class NonAAStrokeRectOp final : public GrMeshDrawOp {
private:
using Helper = GrSimpleMeshDrawOpHelper;
public:
DEFINE_OP_CLASS_ID
const char* name() const override { return "NonAAStrokeRectOp"; }
void visitProxies(const VisitProxyFunc& func) const override {
fHelper.visitProxies(func);
}
SkString dumpInfo() const override {
SkString string;
string.appendf(
"Color: 0x%08x, Rect [L: %.2f, T: %.2f, R: %.2f, B: %.2f], "
"StrokeWidth: %.2f\n",
fColor, fRect.fLeft, fRect.fTop, fRect.fRight, fRect.fBottom, fStrokeWidth);
string += fHelper.dumpInfo();
string += INHERITED::dumpInfo();
return string;
}
static std::unique_ptr<GrDrawOp> Make(GrContext* context,
GrPaint&& paint,
const SkMatrix& viewMatrix,
const SkRect& rect,
const SkStrokeRec& stroke,
GrAAType aaType) {
if (!allowed_stroke(stroke)) {
return nullptr;
}
Helper::Flags flags = Helper::Flags::kNone;
// Depending on sub-pixel coordinates and the particular GPU, we may lose a corner of
// hairline rects. We jam all the vertices to pixel centers to avoid this, but not
// when MSAA is enabled because it can cause ugly artifacts.
if (stroke.getStyle() == SkStrokeRec::kHairline_Style && aaType != GrAAType::kMSAA) {
flags |= Helper::Flags::kSnapVerticesToPixelCenters;
}
return Helper::FactoryHelper<NonAAStrokeRectOp>(context, std::move(paint), flags,
viewMatrix, rect,
stroke, aaType);
}
NonAAStrokeRectOp(const Helper::MakeArgs& helperArgs, GrColor color, Helper::Flags flags,
const SkMatrix& viewMatrix, const SkRect& rect, const SkStrokeRec& stroke,
GrAAType aaType)
: INHERITED(ClassID()), fHelper(helperArgs, aaType, flags) {
fColor = color;
fViewMatrix = viewMatrix;
fRect = rect;
// Sort the rect for hairlines
fRect.sort();
fStrokeWidth = stroke.getWidth();
SkScalar rad = SkScalarHalf(fStrokeWidth);
SkRect bounds = rect;
bounds.outset(rad, rad);
// If our caller snaps to pixel centers then we have to round out the bounds
if (flags & Helper::Flags::kSnapVerticesToPixelCenters) {
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);
this->setBounds(bounds, HasAABloat::kNo, IsZeroArea::kNo);
} else {
this->setTransformedBounds(bounds, fViewMatrix, HasAABloat::kNo, IsZeroArea::kNo);
}
}
FixedFunctionFlags fixedFunctionFlags() const override { return fHelper.fixedFunctionFlags(); }
RequiresDstTexture finalize(const GrCaps& caps, const GrAppliedClip* clip) override {
return fHelper.xpRequiresDstTexture(caps, clip, GrProcessorAnalysisCoverage::kNone,
&fColor);
}
private:
void onPrepareDraws(Target* target) override {
sk_sp<GrGeometryProcessor> gp;
{
using namespace GrDefaultGeoProcFactory;
Color color(fColor);
LocalCoords::Type localCoordsType = fHelper.usesLocalCoords()
? LocalCoords::kUsePosition_Type
: LocalCoords::kUnused_Type;
gp = GrDefaultGeoProcFactory::Make(target->caps().shaderCaps(), color,
Coverage::kSolid_Type, localCoordsType,
fViewMatrix);
}
static constexpr size_t kVertexStride = sizeof(GrDefaultGeoProcFactory::PositionAttr);
SkASSERT(kVertexStride == gp->debugOnly_vertexStride());
int vertexCount = kVertsPerHairlineRect;
if (fStrokeWidth > 0) {
vertexCount = kVertsPerStrokeRect;
}
const GrBuffer* vertexBuffer;
int firstVertex;
void* verts =
target->makeVertexSpace(kVertexStride, vertexCount, &vertexBuffer, &firstVertex);
if (!verts) {
SkDebugf("Could not allocate vertices\n");
return;
}
SkPoint* vertex = reinterpret_cast<SkPoint*>(verts);
GrPrimitiveType primType;
if (fStrokeWidth > 0) {
primType = GrPrimitiveType::kTriangleStrip;
init_stroke_rect_strip(vertex, fRect, fStrokeWidth);
} else {
// hairline
primType = GrPrimitiveType::kLineStrip;
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(primType);
mesh.setNonIndexedNonInstanced(vertexCount);
mesh.setVertexData(vertexBuffer, firstVertex);
auto pipe = fHelper.makePipeline(target);
target->draw(gp.get(), pipe.fPipeline, pipe.fFixedDynamicState, mesh);
}
bool onCombineIfPossible(GrOp* t, const GrCaps&) override {
// NonAA stroke rects cannot combine right now
// TODO make these combinable.
return false;
}
Helper fHelper;
GrColor fColor;
SkMatrix fViewMatrix;
SkRect fRect;
SkScalar fStrokeWidth;
const static int kVertsPerHairlineRect = 5;
const static int kVertsPerStrokeRect = 10;
typedef GrMeshDrawOp INHERITED;
};
} // anonymous namespace
namespace GrRectOpFactory {
std::unique_ptr<GrDrawOp> MakeNonAAStroke(GrContext* context,
GrPaint&& paint,
const SkMatrix& viewMatrix,
const SkRect& rect,
const SkStrokeRec& stroke,
GrAAType aaType) {
return NonAAStrokeRectOp::Make(context, std::move(paint), viewMatrix, rect, stroke, aaType);
}
} // namespace GrRectOpFactory
#if GR_TEST_UTILS
GR_DRAW_OP_TEST_DEFINE(NonAAStrokeRectOp) {
SkMatrix viewMatrix = GrTest::TestMatrix(random);
SkRect rect = GrTest::TestRect(random);
SkScalar strokeWidth = random->nextBool() ? 0.0f : 2.0f;
SkPaint strokePaint;
strokePaint.setStrokeWidth(strokeWidth);
strokePaint.setStyle(SkPaint::kStroke_Style);
strokePaint.setStrokeJoin(SkPaint::kMiter_Join);
SkStrokeRec strokeRec(strokePaint);
GrAAType aaType = GrAAType::kNone;
if (fsaaType == GrFSAAType::kUnifiedMSAA) {
aaType = random->nextBool() ? GrAAType::kMSAA : GrAAType::kNone;
}
return NonAAStrokeRectOp::Make(context, std::move(paint), viewMatrix, rect, strokeRec, aaType);
}
#endif
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