////////////////////////////////////////////////////////////////////////////////
// Shared preamble between gpu and SW-only AA clip mask creation paths.
// Handles caching, determination of clip mask bound & allocation (if needed)
// of the result texture
// Returns true if there is no more work to be done (i.e., we got a cache hit)
bool GrClipMaskManager::clipMaskPreamble(GrGpu* gpu,
const GrClip& clipIn,
GrTexture** result,
GrIRect *resultBounds) {
GrDrawState* origDrawState = gpu->drawState();
GrAssert(origDrawState->isClipState());
GrRenderTarget* rt = origDrawState->getRenderTarget();
GrAssert(NULL != rt);
GrRect rtRect;
rtRect.setLTRB(0, 0,
GrIntToScalar(rt->width()), GrIntToScalar(rt->height()));
// unlike the stencil path the alpha path is not bound to the size of the
// render target - determine the minimum size required for the mask
GrRect bounds;
if (clipIn.hasConservativeBounds()) {
bounds = clipIn.getConservativeBounds();
if (!bounds.intersect(rtRect)) {
// the mask will be empty in this case
GrAssert(false);
bounds.setEmpty();
}
} else {
// still locked to the size of the render target
bounds = rtRect;
}
GrIRect intBounds;
bounds.roundOut(&intBounds);
// need to outset a pixel since the standard bounding box computation
// path doesn't leave any room for antialiasing (esp. w.r.t. rects)
intBounds.outset(1, 1);
// TODO: make sure we don't outset if bounds are still 0,0 @ min
if (fAACache.canReuse(clipIn,
intBounds.width(),
intBounds.height())) {
*result = fAACache.getLastMask();
fAACache.getLastBound(resultBounds);
return true;
}
this->setupCache(clipIn, intBounds);
*resultBounds = intBounds;
return false;
}
void GrDefaultPathRenderer::onDrawPath(GrDrawTarget::StageBitfield stages,
bool stencilOnly) {
GrMatrix viewM = fTarget->getViewMatrix();
GrScalar tol = GR_Scalar1;
tol = GrPathUtils::scaleToleranceToSrc(tol, viewM, fPath->getBounds());
// FIXME: It's really dumb that we recreate the verts for a new vertex
// layout. We only do that because the GrDrawTarget API doesn't allow
// us to change the vertex layout after reserveVertexSpace(). We won't
// actually change the vertex data when the layout changes since all the
// stages reference the positions (rather than having separate tex coords)
// and we don't ever have per-vert colors. In practice our call sites
// won't change the stages in use inside a setPath / removePath pair. But
// it is a silly limitation of the GrDrawTarget design that should be fixed.
if (tol != fPreviousSrcTol ||
stages != fPreviousStages) {
if (!this->createGeom(tol, stages)) {
return;
}
}
GrAssert(NULL != fTarget);
GrDrawTarget::AutoStateRestore asr(fTarget);
bool colorWritesWereDisabled = fTarget->isColorWriteDisabled();
// face culling doesn't make sense here
GrAssert(GrDrawTarget::kBoth_DrawFace == fTarget->getDrawFace());
int passCount = 0;
const GrStencilSettings* passes[3];
GrDrawTarget::DrawFace drawFace[3];
bool reverse = false;
bool lastPassIsBounds;
if (kHairLine_PathFill == fFill) {
passCount = 1;
if (stencilOnly) {
passes[0] = &gDirectToStencil;
} else {
passes[0] = NULL;
}
lastPassIsBounds = false;
drawFace[0] = GrDrawTarget::kBoth_DrawFace;
} else {
if (single_pass_path(*fTarget, *fPath, fFill)) {
passCount = 1;
if (stencilOnly) {
passes[0] = &gDirectToStencil;
} else {
passes[0] = NULL;
}
drawFace[0] = GrDrawTarget::kBoth_DrawFace;
lastPassIsBounds = false;
} else {
switch (fFill) {
case kInverseEvenOdd_PathFill:
reverse = true;
// fallthrough
case kEvenOdd_PathFill:
passes[0] = &gEOStencilPass;
if (stencilOnly) {
passCount = 1;
lastPassIsBounds = false;
} else {
passCount = 2;
lastPassIsBounds = true;
if (reverse) {
passes[1] = &gInvEOColorPass;
} else {
passes[1] = &gEOColorPass;
}
}
drawFace[0] = drawFace[1] = GrDrawTarget::kBoth_DrawFace;
break;
case kInverseWinding_PathFill:
reverse = true;
// fallthrough
case kWinding_PathFill:
if (fSeparateStencil) {
if (fStencilWrapOps) {
passes[0] = &gWindStencilSeparateWithWrap;
} else {
passes[0] = &gWindStencilSeparateNoWrap;
}
passCount = 2;
drawFace[0] = GrDrawTarget::kBoth_DrawFace;
} else {
if (fStencilWrapOps) {
passes[0] = &gWindSingleStencilWithWrapInc;
passes[1] = &gWindSingleStencilWithWrapDec;
} else {
passes[0] = &gWindSingleStencilNoWrapInc;
passes[1] = &gWindSingleStencilNoWrapDec;
}
// which is cw and which is ccw is arbitrary.
drawFace[0] = GrDrawTarget::kCW_DrawFace;
drawFace[1] = GrDrawTarget::kCCW_DrawFace;
passCount = 3;
}
if (stencilOnly) {
lastPassIsBounds = false;
--passCount;
} else {
lastPassIsBounds = true;
drawFace[passCount-1] = GrDrawTarget::kBoth_DrawFace;
if (reverse) {
passes[passCount-1] = &gInvWindColorPass;
} else {
passes[passCount-1] = &gWindColorPass;
}
}
break;
default:
GrAssert(!"Unknown path fFill!");
return;
}
}
}
{
for (int p = 0; p < passCount; ++p) {
fTarget->setDrawFace(drawFace[p]);
if (NULL != passes[p]) {
fTarget->setStencil(*passes[p]);
}
if (lastPassIsBounds && (p == passCount-1)) {
if (!colorWritesWereDisabled) {
fTarget->disableState(GrDrawTarget::kNoColorWrites_StateBit);
}
GrRect bounds;
if (reverse) {
GrAssert(NULL != fTarget->getRenderTarget());
// draw over the whole world.
bounds.setLTRB(0, 0,
GrIntToScalar(fTarget->getRenderTarget()->width()),
GrIntToScalar(fTarget->getRenderTarget()->height()));
GrMatrix vmi;
// mapRect through persp matrix may not be correct
if (!fTarget->getViewMatrix().hasPerspective() &&
fTarget->getViewInverse(&vmi)) {
vmi.mapRect(&bounds);
} else {
if (stages) {
if (!fTarget->getViewInverse(&vmi)) {
GrPrintf("Could not invert matrix.");
return;
}
fTarget->preConcatSamplerMatrices(stages, vmi);
}
fTarget->setViewMatrix(GrMatrix::I());
}
} else {
bounds = fPath->getBounds();
bounds.offset(fTranslate);
}
GrDrawTarget::AutoGeometryPush agp(fTarget);
fTarget->drawSimpleRect(bounds, NULL, stages);
} else {
if (passCount > 1) {
fTarget->enableState(GrDrawTarget::kNoColorWrites_StateBit);
}
if (fUseIndexedDraw) {
fTarget->drawIndexed(fPrimitiveType, 0, 0,
fVertexCnt, fIndexCnt);
} else {
int baseVertex = 0;
for (int sp = 0; sp < fSubpathCount; ++sp) {
fTarget->drawNonIndexed(fPrimitiveType, baseVertex,
fSubpathVertCount[sp]);
baseVertex += fSubpathVertCount[sp];
}
}
}
}
}
}
bool GrGpu::setupClipAndFlushState(GrPrimitiveType type) {
const GrIRect* r = NULL;
GrIRect clipRect;
GrDrawState* drawState = this->drawState();
const GrRenderTarget* rt = drawState->getRenderTarget();
// GrDrawTarget should have filtered this for us
GrAssert(NULL != rt);
if (drawState->isClipState()) {
GrRect bounds;
GrRect rtRect;
rtRect.setLTRB(0, 0,
GrIntToScalar(rt->width()), GrIntToScalar(rt->height()));
if (fClip.hasConservativeBounds()) {
bounds = fClip.getConservativeBounds();
if (!bounds.intersect(rtRect)) {
bounds.setEmpty();
}
} else {
bounds = rtRect;
}
bounds.roundOut(&clipRect);
if (clipRect.isEmpty()) {
clipRect.setLTRB(0,0,0,0);
}
r = &clipRect;
// use the stencil clip if we can't represent the clip as a rectangle.
fClipInStencil = !fClip.isRect() && !fClip.isEmpty() &&
!bounds.isEmpty();
// TODO: dynamically attach a SB when needed.
GrStencilBuffer* stencilBuffer = rt->getStencilBuffer();
if (fClipInStencil && NULL == stencilBuffer) {
return false;
}
if (fClipInStencil &&
stencilBuffer->mustRenderClip(fClip, rt->width(), rt->height())) {
stencilBuffer->setLastClip(fClip, rt->width(), rt->height());
// we set the current clip to the bounds so that our recursive
// draws are scissored to them. We use the copy of the complex clip
// we just stashed on the SB to render from. We set it back after
// we finish drawing it into the stencil.
const GrClip& clip = stencilBuffer->getLastClip();
fClip.setFromRect(bounds);
AutoStateRestore asr(this);
AutoGeometryPush agp(this);
drawState->setViewMatrix(GrMatrix::I());
this->flushScissor(NULL);
#if !VISUALIZE_COMPLEX_CLIP
drawState->enableState(GrDrawState::kNoColorWrites_StateBit);
#else
drawState->disableState(GrDrawState::kNoColorWrites_StateBit);
#endif
int count = clip.getElementCount();
int clipBit = stencilBuffer->bits();
SkASSERT((clipBit <= 16) &&
"Ganesh only handles 16b or smaller stencil buffers");
clipBit = (1 << (clipBit-1));
bool clearToInside;
GrSetOp startOp = kReplace_SetOp; // suppress warning
int start = process_initial_clip_elements(clip,
rtRect,
&clearToInside,
&startOp);
this->clearStencilClip(clipRect, clearToInside);
// walk through each clip element and perform its set op
// with the existing clip.
for (int c = start; c < count; ++c) {
GrPathFill fill;
bool fillInverted;
// enabled at bottom of loop
drawState->disableState(kModifyStencilClip_StateBit);
bool canRenderDirectToStencil; // can the clip element be drawn
// directly to the stencil buffer
// with a non-inverted fill rule
// without extra passes to
// resolve in/out status.
GrPathRenderer* pr = NULL;
const GrPath* clipPath = NULL;
GrPathRenderer::AutoClearPath arp;
if (kRect_ClipType == clip.getElementType(c)) {
canRenderDirectToStencil = true;
fill = kEvenOdd_PathFill;
fillInverted = false;
// there is no point in intersecting a screen filling
// rectangle.
if (kIntersect_SetOp == clip.getOp(c) &&
clip.getRect(c).contains(rtRect)) {
continue;
}
} else {
fill = clip.getPathFill(c);
fillInverted = GrIsFillInverted(fill);
fill = GrNonInvertedFill(fill);
clipPath = &clip.getPath(c);
pr = this->getClipPathRenderer(*clipPath, fill);
if (NULL == pr) {
fClipInStencil = false;
fClip = clip;
return false;
}
canRenderDirectToStencil =
!pr->requiresStencilPass(this, *clipPath, fill);
arp.set(pr, this, clipPath, fill, false, NULL);
}
GrSetOp op = (c == start) ? startOp : clip.getOp(c);
int passes;
GrStencilSettings stencilSettings[GrStencilSettings::kMaxStencilClipPasses];
bool canDrawDirectToClip; // Given the renderer, the element,
// fill rule, and set operation can
// we render the element directly to
// stencil bit used for clipping.
canDrawDirectToClip =
GrStencilSettings::GetClipPasses(op,
canRenderDirectToStencil,
clipBit,
fillInverted,
&passes, stencilSettings);
// draw the element to the client stencil bits if necessary
if (!canDrawDirectToClip) {
GR_STATIC_CONST_SAME_STENCIL(gDrawToStencil,
kIncClamp_StencilOp,
kIncClamp_StencilOp,
kAlways_StencilFunc,
0xffff,
0x0000,
0xffff);
SET_RANDOM_COLOR
if (kRect_ClipType == clip.getElementType(c)) {
*drawState->stencil() = gDrawToStencil;
this->drawSimpleRect(clip.getRect(c), NULL, 0);
} else {
if (canRenderDirectToStencil) {
*drawState->stencil() = gDrawToStencil;
pr->drawPath(0);
} else {
pr->drawPathToStencil();
}
}
}
// now we modify the clip bit by rendering either the clip
// element directly or a bounding rect of the entire clip.
drawState->enableState(kModifyStencilClip_StateBit);
for (int p = 0; p < passes; ++p) {
*drawState->stencil() = stencilSettings[p];
if (canDrawDirectToClip) {
if (kRect_ClipType == clip.getElementType(c)) {
SET_RANDOM_COLOR
this->drawSimpleRect(clip.getRect(c), NULL, 0);
} else {
SET_RANDOM_COLOR
pr->drawPath(0);
}
} else {
SET_RANDOM_COLOR
this->drawSimpleRect(bounds, NULL, 0);
}
}
}
bool GrTesselatedPathRenderer::onDrawPath(const SkPath& path,
GrPathFill fill,
const GrVec* translate,
GrDrawTarget* target,
GrDrawState::StageMask stageMask,
bool antiAlias) {
GrDrawTarget::AutoStateRestore asr(target);
GrDrawState* drawState = target->drawState();
// face culling doesn't make sense here
GrAssert(GrDrawState::kBoth_DrawFace == drawState->getDrawFace());
GrMatrix viewM = drawState->getViewMatrix();
GrScalar tol = GR_Scalar1;
tol = GrPathUtils::scaleToleranceToSrc(tol, viewM, path.getBounds());
GrScalar tolSqd = GrMul(tol, tol);
int subpathCnt;
int maxPts = GrPathUtils::worstCasePointCount(path, &subpathCnt, tol);
GrVertexLayout layout = 0;
for (int s = 0; s < GrDrawState::kNumStages; ++s) {
if ((1 << s) & stageMask) {
layout |= GrDrawTarget::StagePosAsTexCoordVertexLayoutBit(s);
}
}
bool inverted = GrIsFillInverted(fill);
if (inverted) {
maxPts += 4;
subpathCnt++;
}
if (maxPts > USHRT_MAX) {
return false;
}
SkAutoSTMalloc<8, GrPoint> baseMem(maxPts);
GrPoint* base = baseMem;
GrPoint* vert = base;
GrPoint* subpathBase = base;
SkAutoSTMalloc<8, uint16_t> subpathVertCount(subpathCnt);
GrPoint pts[4];
SkPath::Iter iter(path, false);
bool first = true;
int subpath = 0;
for (;;) {
switch (iter.next(pts)) {
case kMove_PathCmd:
if (!first) {
subpathVertCount[subpath] = vert-subpathBase;
subpathBase = vert;
++subpath;
}
*vert = pts[0];
vert++;
break;
case kLine_PathCmd:
*vert = pts[1];
vert++;
break;
case kQuadratic_PathCmd: {
GrPathUtils::generateQuadraticPoints(pts[0], pts[1], pts[2],
tolSqd, &vert,
GrPathUtils::quadraticPointCount(pts, tol));
break;
}
case kCubic_PathCmd: {
GrPathUtils::generateCubicPoints(pts[0], pts[1], pts[2], pts[3],
tolSqd, &vert,
GrPathUtils::cubicPointCount(pts, tol));
break;
}
case kClose_PathCmd:
break;
case kEnd_PathCmd:
subpathVertCount[subpath] = vert-subpathBase;
++subpath; // this could be only in debug
goto FINISHED;
}
first = false;
}
FINISHED:
if (NULL != translate && 0 != translate->fX && 0 != translate->fY) {
for (int i = 0; i < vert - base; i++) {
base[i].offset(translate->fX, translate->fY);
}
}
if (inverted) {
GrRect bounds;
GrAssert(NULL != drawState->getRenderTarget());
bounds.setLTRB(0, 0,
GrIntToScalar(drawState->getRenderTarget()->width()),
GrIntToScalar(drawState->getRenderTarget()->height()));
GrMatrix vmi;
if (drawState->getViewInverse(&vmi)) {
vmi.mapRect(&bounds);
}
*vert++ = GrPoint::Make(bounds.fLeft, bounds.fTop);
*vert++ = GrPoint::Make(bounds.fLeft, bounds.fBottom);
*vert++ = GrPoint::Make(bounds.fRight, bounds.fBottom);
*vert++ = GrPoint::Make(bounds.fRight, bounds.fTop);
subpathVertCount[subpath++] = 4;
}
GrAssert(subpath == subpathCnt);
GrAssert((vert - base) <= maxPts);
size_t count = vert - base;
if (count < 3) {
return true;
}
if (subpathCnt == 1 && !inverted && path.isConvex()) {
if (antiAlias) {
GrEdgeArray edges;
GrMatrix inverse, matrix = drawState->getViewMatrix();
drawState->getViewInverse(&inverse);
count = computeEdgesAndIntersect(matrix, inverse, base, count, &edges, 0.0f);
size_t maxEdges = target->getMaxEdges();
if (count == 0) {
return true;
}
if (count <= maxEdges) {
// All edges fit; upload all edges and draw all verts as a fan
target->setVertexSourceToArray(layout, base, count);
drawState->setEdgeAAData(&edges[0], count);
target->drawNonIndexed(kTriangleFan_PrimitiveType, 0, count);
} else {
// Upload "maxEdges" edges and verts at a time, and draw as
// separate fans
for (size_t i = 0; i < count - 2; i += maxEdges - 2) {
edges[i] = edges[0];
base[i] = base[0];
int size = GR_CT_MIN(count - i, maxEdges);
target->setVertexSourceToArray(layout, &base[i], size);
drawState->setEdgeAAData(&edges[i], size);
target->drawNonIndexed(kTriangleFan_PrimitiveType, 0, size);
}
}
drawState->setEdgeAAData(NULL, 0);
} else {
target->setVertexSourceToArray(layout, base, count);
target->drawNonIndexed(kTriangleFan_PrimitiveType, 0, count);
}
return true;
}
if (antiAlias) {
// Run the tesselator once to get the boundaries.
GrBoundaryTess btess(count, fill_type_to_glu_winding_rule(fill));
btess.addVertices(base, subpathVertCount, subpathCnt);
GrMatrix inverse, matrix = drawState->getViewMatrix();
if (!drawState->getViewInverse(&inverse)) {
return false;
}
if (btess.vertices().count() > USHRT_MAX) {
return false;
}
// Inflate the boundary, and run the tesselator again to generate
// interior polys.
const GrPointArray& contourPoints = btess.contourPoints();
const GrIndexArray& contours = btess.contours();
GrEdgePolygonTess ptess(contourPoints.count(), GLU_TESS_WINDING_NONZERO, matrix);
size_t i = 0;
Sk_gluTessBeginPolygon(ptess.tess(), &ptess);
for (int contour = 0; contour < contours.count(); ++contour) {
int count = contours[contour];
GrEdgeArray edges;
int newCount = computeEdgesAndIntersect(matrix, inverse, &btess.contourPoints()[i], count, &edges, 1.0f);
Sk_gluTessBeginContour(ptess.tess());
for (int j = 0; j < newCount; j++) {
ptess.addVertex(contourPoints[i + j], ptess.vertices().count());
}
i += count;
Sk_gluTessEndContour(ptess.tess());
}
Sk_gluTessEndPolygon(ptess.tess());
if (ptess.vertices().count() > USHRT_MAX) {
return false;
}
// Draw the resulting polys and upload their edge data.
drawState->enableState(GrDrawState::kEdgeAAConcave_StateBit);
const GrPointArray& vertices = ptess.vertices();
const GrIndexArray& indices = ptess.indices();
const GrDrawState::Edge* edges = ptess.edges();
GR_DEBUGASSERT(indices.count() % 3 == 0);
for (int i = 0; i < indices.count(); i += 3) {
GrPoint tri_verts[3];
int index0 = indices[i];
int index1 = indices[i + 1];
int index2 = indices[i + 2];
tri_verts[0] = vertices[index0];
tri_verts[1] = vertices[index1];
tri_verts[2] = vertices[index2];
GrDrawState::Edge tri_edges[6];
int t = 0;
const GrDrawState::Edge& edge0 = edges[index0 * 2];
const GrDrawState::Edge& edge1 = edges[index0 * 2 + 1];
const GrDrawState::Edge& edge2 = edges[index1 * 2];
const GrDrawState::Edge& edge3 = edges[index1 * 2 + 1];
const GrDrawState::Edge& edge4 = edges[index2 * 2];
const GrDrawState::Edge& edge5 = edges[index2 * 2 + 1];
if (validEdge(edge0) && validEdge(edge1)) {
tri_edges[t++] = edge0;
tri_edges[t++] = edge1;
}
if (validEdge(edge2) && validEdge(edge3)) {
tri_edges[t++] = edge2;
tri_edges[t++] = edge3;
}
if (validEdge(edge4) && validEdge(edge5)) {
tri_edges[t++] = edge4;
tri_edges[t++] = edge5;
}
drawState->setEdgeAAData(&tri_edges[0], t);
target->setVertexSourceToArray(layout, &tri_verts[0], 3);
target->drawNonIndexed(kTriangles_PrimitiveType, 0, 3);
}
drawState->setEdgeAAData(NULL, 0);
drawState->disableState(GrDrawState::kEdgeAAConcave_StateBit);
return true;
}
GrPolygonTess ptess(count, fill_type_to_glu_winding_rule(fill));
ptess.addVertices(base, subpathVertCount, subpathCnt);
const GrPointArray& vertices = ptess.vertices();
const GrIndexArray& indices = ptess.indices();
if (indices.count() > 0) {
target->setVertexSourceToArray(layout, vertices.begin(), vertices.count());
target->setIndexSourceToArray(indices.begin(), indices.count());
target->drawIndexed(kTriangles_PrimitiveType,
0,
0,
vertices.count(),
indices.count());
}
return true;
}
////////////////////////////////////////////////////////////////////////////////
// sort out what kind of clip mask needs to be created: alpha, stencil,
// scissor, or entirely software
bool GrClipMaskManager::createClipMask(GrGpu* gpu,
const GrClip& clipIn,
ScissoringSettings* scissorSettings) {
GrAssert(scissorSettings);
scissorSettings->fEnableScissoring = false;
fClipMaskInStencil = false;
fClipMaskInAlpha = false;
GrDrawState* drawState = gpu->drawState();
if (!drawState->isClipState()) {
return true;
}
GrRenderTarget* rt = drawState->getRenderTarget();
// GrDrawTarget should have filtered this for us
GrAssert(NULL != rt);
#if GR_SW_CLIP
if (create_mask_in_sw()) {
// The clip geometry is complex enough that it will be more
// efficient to create it entirely in software
GrTexture* result = NULL;
GrIRect bound;
if (this->createSoftwareClipMask(gpu, clipIn, &result, &bound)) {
fClipMaskInAlpha = true;
setup_drawstate_aaclip(gpu, result, bound);
return true;
}
}
#endif
#if GR_AA_CLIP
// If MSAA is enabled use the (faster) stencil path for AA clipping
// otherwise the alpha clip mask is our only option
if (clipIn.requiresAA() && 0 == rt->numSamples()) {
// Since we are going to create a destination texture of the correct
// size for the mask (rather than being bound by the size of the
// render target) we aren't going to use scissoring like the stencil
// path does (see scissorSettings below)
GrTexture* result = NULL;
GrIRect bound;
if (this->createAlphaClipMask(gpu, clipIn, &result, &bound)) {
fClipMaskInAlpha = true;
setup_drawstate_aaclip(gpu, result, bound);
return true;
}
// if alpha clip mask creation fails fall through to the stencil
// buffer method
}
#endif // GR_AA_CLIP
GrRect bounds;
GrRect rtRect;
rtRect.setLTRB(0, 0,
GrIntToScalar(rt->width()), GrIntToScalar(rt->height()));
if (clipIn.hasConservativeBounds()) {
bounds = clipIn.getConservativeBounds();
if (!bounds.intersect(rtRect)) {
bounds.setEmpty();
}
} else {
bounds = rtRect;
}
bounds.roundOut(&scissorSettings->fScissorRect);
if (scissorSettings->fScissorRect.isEmpty()) {
scissorSettings->fScissorRect.setLTRB(0,0,0,0);
// TODO: I think we can do an early exit here - after refactoring try:
// set fEnableScissoring to true but leave fClipMaskInStencil false
// and return - everything is going to be scissored away anyway!
}
scissorSettings->fEnableScissoring = true;
// use the stencil clip if we can't represent the clip as a rectangle.
fClipMaskInStencil = !clipIn.isRect() && !clipIn.isEmpty() &&
!bounds.isEmpty();
if (fClipMaskInStencil) {
return this->createStencilClipMask(gpu, clipIn, bounds, scissorSettings);
}
return true;
}
bool GrStencilAndCoverPathRenderer::onDrawPath(const SkPath& path,
GrPathFill fill,
GrDrawTarget* target,
bool antiAlias) {
GrAssert(!antiAlias);
GrAssert(kHairLine_GrPathFill != fill);
GrDrawState* drawState = target->drawState();
GrAssert(drawState->getStencil().isDisabled());
SkAutoTUnref<GrPath> p(fGpu->createPath(path));
GrPathFill nonInvertedFill = GrNonInvertedFill(fill);
target->stencilPath(p, 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();
GrScalar bloat = drawState->getViewMatrix().getMaxStretch() * GR_ScalarHalf;
GrDrawState::AutoDeviceCoordDraw adcd;
if (nonInvertedFill == fill) {
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);
GrMatrix vmi;
bounds.setLTRB(0, 0,
GrIntToScalar(drawState->getRenderTarget()->width()),
GrIntToScalar(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;
}
void GrDefaultPathRenderer::onDrawPath(GrDrawTarget* target,
GrDrawTarget::StageBitfield stages,
const GrPath& path,
GrPathFill fill,
const GrPoint* translate,
bool stencilOnly) {
GrDrawTarget::AutoStateRestore asr(target);
bool colorWritesWereDisabled = target->isColorWriteDisabled();
// face culling doesn't make sense here
GrAssert(GrDrawTarget::kBoth_DrawFace == target->getDrawFace());
GrMatrix viewM = target->getViewMatrix();
// In order to tesselate the path we get a bound on how much the matrix can
// stretch when mapping to screen coordinates.
GrScalar stretch = viewM.getMaxStretch();
bool useStretch = stretch > 0;
GrScalar tol = fCurveTolerance;
if (!useStretch) {
// TODO: deal with perspective in some better way.
tol /= 10;
} else {
tol = GrScalarDiv(tol, stretch);
}
GrScalar tolSqd = GrMul(tol, tol);
int subpathCnt;
int maxPts = GrPathUtils::worstCasePointCount(path, &subpathCnt, tol);
GrVertexLayout layout = 0;
for (int s = 0; s < GrDrawTarget::kNumStages; ++s) {
if ((1 << s) & stages) {
layout |= GrDrawTarget::StagePosAsTexCoordVertexLayoutBit(s);
}
}
// add 4 to hold the bounding rect
GrDrawTarget::AutoReleaseGeometry arg(target, layout, maxPts + 4, 0);
GrPoint* base = (GrPoint*) arg.vertices();
GrPoint* vert = base;
GrPoint* subpathBase = base;
GrAutoSTMalloc<8, uint16_t> subpathVertCount(subpathCnt);
// TODO: use primitve restart if available rather than multiple draws
GrPrimitiveType type;
int passCount = 0;
const GrStencilSettings* passes[3];
GrDrawTarget::DrawFace drawFace[3];
bool reverse = false;
bool lastPassIsBounds;
if (kHairLine_PathFill == fill) {
type = kLineStrip_PrimitiveType;
passCount = 1;
if (stencilOnly) {
passes[0] = &gDirectToStencil;
} else {
passes[0] = NULL;
}
lastPassIsBounds = false;
drawFace[0] = GrDrawTarget::kBoth_DrawFace;
} else {
type = kTriangleFan_PrimitiveType;
if (single_pass_path(*target, path, fill)) {
passCount = 1;
if (stencilOnly) {
passes[0] = &gDirectToStencil;
} else {
passes[0] = NULL;
}
drawFace[0] = GrDrawTarget::kBoth_DrawFace;
lastPassIsBounds = false;
} else {
switch (fill) {
case kInverseEvenOdd_PathFill:
reverse = true;
// fallthrough
case kEvenOdd_PathFill:
passes[0] = &gEOStencilPass;
if (stencilOnly) {
passCount = 1;
lastPassIsBounds = false;
} else {
passCount = 2;
lastPassIsBounds = true;
if (reverse) {
passes[1] = &gInvEOColorPass;
} else {
passes[1] = &gEOColorPass;
}
}
drawFace[0] = drawFace[1] = GrDrawTarget::kBoth_DrawFace;
break;
case kInverseWinding_PathFill:
reverse = true;
// fallthrough
case kWinding_PathFill:
if (fSeparateStencil) {
if (fStencilWrapOps) {
passes[0] = &gWindStencilSeparateWithWrap;
} else {
passes[0] = &gWindStencilSeparateNoWrap;
}
passCount = 2;
drawFace[0] = GrDrawTarget::kBoth_DrawFace;
} else {
if (fStencilWrapOps) {
passes[0] = &gWindSingleStencilWithWrapInc;
passes[1] = &gWindSingleStencilWithWrapDec;
} else {
passes[0] = &gWindSingleStencilNoWrapInc;
passes[1] = &gWindSingleStencilNoWrapDec;
}
// which is cw and which is ccw is arbitrary.
drawFace[0] = GrDrawTarget::kCW_DrawFace;
drawFace[1] = GrDrawTarget::kCCW_DrawFace;
passCount = 3;
}
if (stencilOnly) {
lastPassIsBounds = false;
--passCount;
} else {
lastPassIsBounds = true;
drawFace[passCount-1] = GrDrawTarget::kBoth_DrawFace;
if (reverse) {
passes[passCount-1] = &gInvWindColorPass;
} else {
passes[passCount-1] = &gWindColorPass;
}
}
break;
default:
GrAssert(!"Unknown path fill!");
return;
}
}
}
GrPoint pts[4];
bool first = true;
int subpath = 0;
SkPath::Iter iter(path, false);
for (;;) {
GrPathCmd cmd = (GrPathCmd)iter.next(pts);
switch (cmd) {
case kMove_PathCmd:
if (!first) {
subpathVertCount[subpath] = vert-subpathBase;
subpathBase = vert;
++subpath;
}
*vert = pts[0];
vert++;
break;
case kLine_PathCmd:
*vert = pts[1];
vert++;
break;
case kQuadratic_PathCmd: {
GrPathUtils::generateQuadraticPoints(pts[0], pts[1], pts[2],
tolSqd, &vert,
GrPathUtils::quadraticPointCount(pts, tol));
break;
}
case kCubic_PathCmd: {
GrPathUtils::generateCubicPoints(pts[0], pts[1], pts[2], pts[3],
tolSqd, &vert,
GrPathUtils::cubicPointCount(pts, tol));
break;
}
case kClose_PathCmd:
break;
case kEnd_PathCmd:
subpathVertCount[subpath] = vert-subpathBase;
++subpath; // this could be only in debug
goto FINISHED;
}
first = false;
}
FINISHED:
GrAssert(subpath == subpathCnt);
GrAssert((vert - base) <= maxPts);
if (translate) {
int count = vert - base;
for (int i = 0; i < count; i++) {
base[i].offset(translate->fX, translate->fY);
}
}
// if we're stenciling we will follow with a pass that draws
// a bounding rect to set the color. We're stenciling when
// passCount > 1.
const int& boundVertexStart = maxPts;
GrPoint* boundsVerts = base + boundVertexStart;
if (lastPassIsBounds) {
GrRect bounds;
if (reverse) {
GrAssert(NULL != target->getRenderTarget());
// draw over the whole world.
bounds.setLTRB(0, 0,
GrIntToScalar(target->getRenderTarget()->width()),
GrIntToScalar(target->getRenderTarget()->height()));
GrMatrix vmi;
if (target->getViewInverse(&vmi)) {
vmi.mapRect(&bounds);
}
} else {
bounds.setBounds((GrPoint*)base, vert - base);
}
boundsVerts[0].setRectFan(bounds.fLeft, bounds.fTop, bounds.fRight,
bounds.fBottom);
}
for (int p = 0; p < passCount; ++p) {
target->setDrawFace(drawFace[p]);
if (NULL != passes[p]) {
target->setStencil(*passes[p]);
}
if (lastPassIsBounds && (p == passCount-1)) {
if (!colorWritesWereDisabled) {
target->disableState(GrDrawTarget::kNoColorWrites_StateBit);
}
target->drawNonIndexed(kTriangleFan_PrimitiveType,
boundVertexStart, 4);
} else {
if (passCount > 1) {
target->enableState(GrDrawTarget::kNoColorWrites_StateBit);
}
int baseVertex = 0;
for (int sp = 0; sp < subpathCnt; ++sp) {
target->drawNonIndexed(type,
baseVertex,
subpathVertCount[sp]);
baseVertex += subpathVertCount[sp];
}
}
}
}
bool GrGpu::setupClipAndFlushState(GrPrimitiveType type) {
const GrIRect* r = NULL;
GrIRect clipRect;
// we check this early because we need a valid
// render target to setup stencil clipping
// before even going into flushGraphicsState
if (NULL == fCurrDrawState.fRenderTarget) {
GrAssert(!"No render target bound.");
return false;
}
if (fCurrDrawState.fFlagBits & kClip_StateBit) {
GrRenderTarget& rt = *fCurrDrawState.fRenderTarget;
GrRect bounds;
GrRect rtRect;
rtRect.setLTRB(0, 0,
GrIntToScalar(rt.width()), GrIntToScalar(rt.height()));
if (fClip.hasConservativeBounds()) {
bounds = fClip.getConservativeBounds();
bounds.intersectWith(rtRect);
} else {
bounds = rtRect;
}
bounds.roundOut(&clipRect);
if (clipRect.isEmpty()) {
clipRect.setLTRB(0,0,0,0);
}
r = &clipRect;
fClipState.fClipInStencil = !fClip.isRect() &&
!fClip.isEmpty() &&
!bounds.isEmpty();
if (fClipState.fClipInStencil &&
(fClipState.fClipIsDirty ||
fClip != rt.fLastStencilClip)) {
rt.fLastStencilClip = fClip;
// we set the current clip to the bounds so that our recursive
// draws are scissored to them. We use the copy of the complex clip
// in the rt to render
const GrClip& clip = rt.fLastStencilClip;
fClip.setFromRect(bounds);
AutoStateRestore asr(this);
AutoInternalDrawGeomRestore aidgr(this);
this->setViewMatrix(GrMatrix::I());
this->eraseStencilClip(clipRect);
this->flushScissor(NULL);
#if !VISUALIZE_COMPLEX_CLIP
this->enableState(kNoColorWrites_StateBit);
#else
this->disableState(kNoColorWrites_StateBit);
#endif
int count = clip.getElementCount();
int clipBit = rt.stencilBits();
clipBit = (1 << (clipBit-1));
// often we'll see the first two elements of the clip are
// the full rt size and another element intersected with it.
// We can skip the first full-size rect and save a big rect draw.
int firstElement = 0;
if (clip.getElementCount() > 1 &&
kRect_ClipType == clip.getElementType(0) &&
kIntersect_SetOp == clip.getOp(1)&&
clip.getRect(0).contains(bounds)) {
firstElement = 1;
}
// walk through each clip element and perform its set op
// with the existing clip.
for (int c = firstElement; c < count; ++c) {
GrPathFill fill;
// enabled at bottom of loop
this->disableState(kModifyStencilClip_StateBit);
bool canDrawDirectToClip;
if (kRect_ClipType == clip.getElementType(c)) {
canDrawDirectToClip = true;
fill = kEvenOdd_PathFill;
} else {
fill = clip.getPathFill(c);
GrPathRenderer* pr = this->getPathRenderer();
canDrawDirectToClip = pr->requiresStencilPass(this, clip.getPath(c), fill);
}
GrSetOp op = firstElement == c ? kReplace_SetOp : clip.getOp(c);
int passes;
GrStencilSettings stencilSettings[GrStencilSettings::kMaxStencilClipPasses];
canDrawDirectToClip = GrStencilSettings::GetClipPasses(op, canDrawDirectToClip,
clipBit, IsFillInverted(fill),
&passes, stencilSettings);
// draw the element to the client stencil bits if necessary
if (!canDrawDirectToClip) {
if (kRect_ClipType == clip.getElementType(c)) {
static const GrStencilSettings gDrawToStencil = {
kIncClamp_StencilOp, kIncClamp_StencilOp,
kIncClamp_StencilOp, kIncClamp_StencilOp,
kAlways_StencilFunc, kAlways_StencilFunc,
0xffffffff, 0xffffffff,
0x00000000, 0x00000000,
0xffffffff, 0xffffffff,
};
this->setStencil(gDrawToStencil);
SET_RANDOM_COLOR
this->drawSimpleRect(clip.getRect(c), NULL, 0);
} else {
SET_RANDOM_COLOR
getPathRenderer()->drawPathToStencil(this, clip.getPath(c),
NonInvertedFill(fill),
NULL);
}
}
// now we modify the clip bit by rendering either the clip
// element directly or a bounding rect of the entire clip.
this->enableState(kModifyStencilClip_StateBit);
for (int p = 0; p < passes; ++p) {
this->setStencil(stencilSettings[p]);
if (canDrawDirectToClip) {
if (kRect_ClipType == clip.getElementType(c)) {
SET_RANDOM_COLOR
this->drawSimpleRect(clip.getRect(c), NULL, 0);
} else {
SET_RANDOM_COLOR
getPathRenderer()->drawPath(this, 0,
clip.getPath(c),
fill, NULL);
}
} else {
SET_RANDOM_COLOR
this->drawSimpleRect(bounds, 0, NULL);
}
}
}
fClip = clip;
// recusive draws would have disabled this.
fClipState.fClipInStencil = true;
}
fClipState.fClipIsDirty = false;
}
// Must flush the scissor after graphics state
if (!this->flushGraphicsState(type)) {
return false;
}
this->flushScissor(r);
return true;
}
bool GrDefaultPathRenderer::internalDrawPath(const SkPath& path,
GrPathFill fill,
GrDrawTarget* target,
bool stencilOnly) {
GrMatrix viewM = target->getDrawState().getViewMatrix();
GrScalar tol = GR_Scalar1;
tol = GrPathUtils::scaleToleranceToSrc(tol, viewM, path.getBounds());
int vertexCnt;
int indexCnt;
GrPrimitiveType primType;
GrDrawTarget::AutoReleaseGeometry arg;
if (!this->createGeom(path,
fill,
tol,
target,
&primType,
&vertexCnt,
&indexCnt,
&arg)) {
return false;
}
GrAssert(NULL != target);
GrDrawTarget::AutoStateRestore asr(target, GrDrawTarget::kPreserve_ASRInit);
GrDrawState* drawState = target->drawState();
bool colorWritesWereDisabled = drawState->isColorWriteDisabled();
// face culling doesn't make sense here
GrAssert(GrDrawState::kBoth_DrawFace == drawState->getDrawFace());
int passCount = 0;
const GrStencilSettings* passes[3];
GrDrawState::DrawFace drawFace[3];
bool reverse = false;
bool lastPassIsBounds;
if (kHairLine_GrPathFill == fill) {
passCount = 1;
if (stencilOnly) {
passes[0] = &gDirectToStencil;
} else {
passes[0] = NULL;
}
lastPassIsBounds = false;
drawFace[0] = GrDrawState::kBoth_DrawFace;
} else {
if (single_pass_path(path, fill)) {
passCount = 1;
if (stencilOnly) {
passes[0] = &gDirectToStencil;
} else {
passes[0] = NULL;
}
drawFace[0] = GrDrawState::kBoth_DrawFace;
lastPassIsBounds = false;
} else {
switch (fill) {
case kInverseEvenOdd_GrPathFill:
reverse = true;
// fallthrough
case kEvenOdd_GrPathFill:
passes[0] = &gEOStencilPass;
if (stencilOnly) {
passCount = 1;
lastPassIsBounds = false;
} else {
passCount = 2;
lastPassIsBounds = true;
if (reverse) {
passes[1] = &gInvEOColorPass;
} else {
passes[1] = &gEOColorPass;
}
}
drawFace[0] = drawFace[1] = GrDrawState::kBoth_DrawFace;
break;
case kInverseWinding_GrPathFill:
reverse = true;
// fallthrough
case kWinding_GrPathFill:
if (fSeparateStencil) {
if (fStencilWrapOps) {
passes[0] = &gWindStencilSeparateWithWrap;
} else {
passes[0] = &gWindStencilSeparateNoWrap;
}
passCount = 2;
drawFace[0] = GrDrawState::kBoth_DrawFace;
} else {
if (fStencilWrapOps) {
passes[0] = &gWindSingleStencilWithWrapInc;
passes[1] = &gWindSingleStencilWithWrapDec;
} else {
passes[0] = &gWindSingleStencilNoWrapInc;
passes[1] = &gWindSingleStencilNoWrapDec;
}
// which is cw and which is ccw is arbitrary.
drawFace[0] = GrDrawState::kCW_DrawFace;
drawFace[1] = GrDrawState::kCCW_DrawFace;
passCount = 3;
}
if (stencilOnly) {
lastPassIsBounds = false;
--passCount;
} else {
lastPassIsBounds = true;
drawFace[passCount-1] = GrDrawState::kBoth_DrawFace;
if (reverse) {
passes[passCount-1] = &gInvWindColorPass;
} else {
passes[passCount-1] = &gWindColorPass;
}
}
break;
default:
GrAssert(!"Unknown path fFill!");
return false;
}
}
}
{
for (int p = 0; p < passCount; ++p) {
drawState->setDrawFace(drawFace[p]);
if (NULL != passes[p]) {
*drawState->stencil() = *passes[p];
}
if (lastPassIsBounds && (p == passCount-1)) {
if (!colorWritesWereDisabled) {
drawState->disableState(GrDrawState::kNoColorWrites_StateBit);
}
GrRect bounds;
GrDrawState::AutoDeviceCoordDraw adcd;
if (reverse) {
GrAssert(NULL != drawState->getRenderTarget());
// draw over the whole world.
bounds.setLTRB(0, 0,
GrIntToScalar(drawState->getRenderTarget()->width()),
GrIntToScalar(drawState->getRenderTarget()->height()));
GrMatrix vmi;
// mapRect through persp matrix may not be correct
if (!drawState->getViewMatrix().hasPerspective() &&
drawState->getViewInverse(&vmi)) {
vmi.mapRect(&bounds);
} else {
adcd.set(drawState);
}
} else {
bounds = path.getBounds();
}
GrDrawTarget::AutoGeometryPush agp(target);
target->drawSimpleRect(bounds, NULL);
} else {
if (passCount > 1) {
drawState->enableState(GrDrawState::kNoColorWrites_StateBit);
}
if (indexCnt) {
target->drawIndexed(primType, 0, 0,
vertexCnt, indexCnt);
} else {
target->drawNonIndexed(primType, 0, vertexCnt);
}
}
}
}
return true;
}
////////////////////////////////////////////////////////////////////////////////
// sort out what kind of clip mask needs to be created: alpha, stencil,
// scissor, or entirely software
bool GrClipMaskManager::createClipMask(GrGpu* gpu,
const GrClip& clipIn,
ScissoringSettings* scissorSettings) {
GrAssert(scissorSettings);
scissorSettings->fEnableScissoring = false;
fClipMaskInStencil = false;
fClipMaskInAlpha = false;
GrDrawState* drawState = gpu->drawState();
if (!drawState->isClipState()) {
return true;
}
GrRenderTarget* rt = drawState->getRenderTarget();
// GrDrawTarget should have filtered this for us
GrAssert(NULL != rt);
#if GR_SW_CLIP
// If MSAA is enabled we can do everything in the stencil buffer.
// Otherwise check if we should just create the entire clip mask
// in software (this will only happen if the clip mask is anti-aliased
// and too complex for the gpu to handle in its entirety)
if (0 == rt->numSamples() && useSWOnlyPath(gpu, clipIn)) {
// The clip geometry is complex enough that it will be more
// efficient to create it entirely in software
GrTexture* result = NULL;
GrIRect bound;
if (this->createSoftwareClipMask(gpu, clipIn, &result, &bound)) {
fClipMaskInAlpha = true;
setup_drawstate_aaclip(gpu, result, bound);
return true;
}
// if SW clip mask creation fails fall through to the other
// two possible methods (bottoming out at stencil clipping)
}
#endif // GR_SW_CLIP
#if GR_AA_CLIP
// If MSAA is enabled use the (faster) stencil path for AA clipping
// otherwise the alpha clip mask is our only option
if (0 == rt->numSamples() && clipIn.requiresAA()) {
// Since we are going to create a destination texture of the correct
// size for the mask (rather than being bound by the size of the
// render target) we aren't going to use scissoring like the stencil
// path does (see scissorSettings below)
GrTexture* result = NULL;
GrIRect bound;
if (this->createAlphaClipMask(gpu, clipIn, &result, &bound)) {
fClipMaskInAlpha = true;
setup_drawstate_aaclip(gpu, result, bound);
return true;
}
// if alpha clip mask creation fails fall through to the stencil
// buffer method
}
#endif // GR_AA_CLIP
// Either a hard (stencil buffer) clip was explicitly requested or
// an antialiased clip couldn't be created. In either case, free up
// the texture in the antialiased mask cache.
// TODO: this may require more investigation. Ganesh performs a lot of
// utility draws (e.g., clears, InOrderDrawBuffer playbacks) that hit
// the stencil buffer path. These may be "incorrectly" clearing the
// AA cache.
fAACache.reset();
GrRect bounds;
GrRect rtRect;
rtRect.setLTRB(0, 0,
GrIntToScalar(rt->width()), GrIntToScalar(rt->height()));
if (clipIn.hasConservativeBounds()) {
bounds = clipIn.getConservativeBounds();
if (!bounds.intersect(rtRect)) {
bounds.setEmpty();
}
} else {
bounds = rtRect;
}
bounds.roundOut(&scissorSettings->fScissorRect);
if (scissorSettings->fScissorRect.isEmpty()) {
scissorSettings->fScissorRect.setLTRB(0,0,0,0);
// TODO: I think we can do an early exit here - after refactoring try:
// set fEnableScissoring to true but leave fClipMaskInStencil false
// and return - everything is going to be scissored away anyway!
}
scissorSettings->fEnableScissoring = true;
// use the stencil clip if we can't represent the clip as a rectangle.
fClipMaskInStencil = !clipIn.isRect() && !clipIn.isEmpty() &&
!bounds.isEmpty();
if (fClipMaskInStencil) {
return this->createStencilClipMask(gpu, clipIn, bounds, scissorSettings);
}
return true;
}