bool GrStencilAndCoverPathRenderer::onDrawPath(const SkPath& path,
const SkStroke& stroke,
GrDrawTarget* target,
bool antiAlias) {
GrAssert(!antiAlias);
GrAssert(0 != stroke.getWidthIfStroked());
GrDrawState* drawState = target->drawState();
GrAssert(drawState->getStencil().isDisabled());
SkAutoTUnref<GrPath> p(fGpu->createPath(path));
SkPath::FillType nonInvertedFill = SkPath::NonInverseFill(path.getFillType());
target->stencilPath(p, stroke, nonInvertedFill);
// TODO: Use built in cover operation rather than a rect draw. This will require making our
// fragment shaders be able to eat varyings generated by a matrix.
// fill the path, zero out the stencil
GrRect bounds = p->getBounds();
SkScalar bloat = drawState->getViewMatrix().getMaxStretch() * SK_ScalarHalf;
GrDrawState::AutoDeviceCoordDraw adcd;
if (nonInvertedFill == path.getFillType()) {
GR_STATIC_CONST_SAME_STENCIL(kStencilPass,
kZero_StencilOp,
kZero_StencilOp,
kNotEqual_StencilFunc,
0xffff,
0x0000,
0xffff);
*drawState->stencil() = kStencilPass;
} else {
GR_STATIC_CONST_SAME_STENCIL(kInvertedStencilPass,
kZero_StencilOp,
kZero_StencilOp,
// We know our rect will hit pixels outside the clip and the user bits will be 0
// outside the clip. So we can't just fill where the user bits are 0. We also need to
// check that the clip bit is set.
kEqualIfInClip_StencilFunc,
0xffff,
0x0000,
0xffff);
SkMatrix vmi;
bounds.setLTRB(0, 0,
SkIntToScalar(drawState->getRenderTarget()->width()),
SkIntToScalar(drawState->getRenderTarget()->height()));
// mapRect through persp matrix may not be correct
if (!drawState->getViewMatrix().hasPerspective() && drawState->getViewInverse(&vmi)) {
vmi.mapRect(&bounds);
// theoretically could set bloat = 0, instead leave it because of matrix inversion
// precision.
} else {
adcd.set(drawState);
bloat = 0;
}
*drawState->stencil() = kInvertedStencilPass;
}
bounds.outset(bloat, bloat);
target->drawSimpleRect(bounds, NULL);
target->drawState()->stencil()->setDisabled();
return true;
}
