Move ViewMatrix off of drawstate

src/gpu/GrClipMaskManager.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrClipMaskManager.h"
 #include "GrAAConvexPathRenderer.h"
 #include "GrAAHairLinePathRenderer.h"
@@ skipping 38 matching lines @@
                                       mat,
                                       GrTextureDomain::MakeTexelDomain(result, domainTexels),
                                       GrTextureDomain::kDecal_Mode,
                                       GrTextureParams::kNone_FilterMode,
                                       kDevice_GrCoordSet))->unref();
 }
 
 bool path_needs_SW_renderer(GrContext* context,
                             const GrDrawTarget* gpu,
                             const GrDrawState* drawState,
+                            const SkMatrix& viewMatrix,
                             const SkPath& origPath,
                             const SkStrokeRec& stroke,
                             bool doAA) {
     // the gpu alpha mask will draw the inverse paths as non-inverse to a temp buffer
     SkTCopyOnFirstWrite<SkPath> path(origPath);
     if (path->isInverseFillType()) {
         path.writable()->toggleInverseFillType();
     }
     // last (false) parameter disallows use of the SW path renderer
     GrPathRendererChain::DrawType type = doAA ?
                                          GrPathRendererChain::kColorAntiAlias_DrawType :
                                          GrPathRendererChain::kColor_DrawType;
 
-    return NULL == context->getPathRenderer(gpu, drawState, *path, stroke, false, type);
+    return NULL == context->getPathRenderer(gpu, drawState, viewMatrix, *path, stroke, false, type);
 }
 }
 
 /*
  * This method traverses the clip stack to see if the GrSoftwarePathRenderer
  * will be used on any element. If so, it returns true to indicate that the
  * entire clip should be rendered in SW and then uploaded en masse to the gpu.
  */
 bool GrClipMaskManager::useSWOnlyPath(const GrDrawState* drawState,
+                                      const SkMatrix& viewMatrix,

[bsalomon, 2014/12/29 20:26:58]

Maybe take the skvector translate here instead of a matrix?

                                       const GrReducedClip::ElementList& elements) {
     // TODO: generalize this function so that when
     // a clip gets complex enough it can just be done in SW regardless
     // of whether it would invoke the GrSoftwarePathRenderer.
     SkStrokeRec stroke(SkStrokeRec::kFill_InitStyle);
 
     for (GrReducedClip::ElementList::Iter iter(elements.headIter()); iter.get(); iter.next()) {
         const Element* element = iter.get();
         // rects can always be drawn directly w/o using the software path
         // Skip rrects once we're drawing them directly.
         if (Element::kRect_Type != element->getType()) {
             SkPath path;
             element->asPath(&path);
-            if (path_needs_SW_renderer(this->getContext(), fClipTarget, drawState, path, stroke,
-                                       element->isAA())) {
+            if (path_needs_SW_renderer(this->getContext(), fClipTarget, drawState, viewMatrix,
+                                       path, stroke, element->isAA())) {
                 return true;
             }
         }
     }
     return false;
 }
 
 bool GrClipMaskManager::installClipEffects(GrDrawState* drawState,
                                            GrDrawState::AutoRestoreEffects* are,
                                            const GrReducedClip::ElementList& elements,
@@ skipping 159 matching lines @@
             this->setDrawStateStencil(drawState, ars);
             return true;
         }
     }
 
 #if GR_AA_CLIP
     // If MSAA is enabled we can do everything in the stencil buffer.
     if (0 == rt->numSamples() && requiresAA) {
         GrTexture* result = NULL;
 
-        if (this->useSWOnlyPath(drawState, elements)) {
+        // The top-left of the mask corresponds to the top-left corner of the bounds.
+        SkVector clipToMaskOffset = {
+            SkIntToScalar(-clipSpaceIBounds.fLeft),
+            SkIntToScalar(-clipSpaceIBounds.fTop)
+        };
+
+        // Set the matrix so that rendered clip elements are transformed to mask space from clip
+        // space.
+        SkMatrix translate;
+        translate.setTranslate(clipToMaskOffset);
+
+        if (this->useSWOnlyPath(drawState, translate, elements)) {
             // The clip geometry is complex enough that it will be more efficient to create it
             // entirely in software
             result = this->createSoftwareClipMask(genID,
                                                   initialState,
                                                   elements,
+                                                  translate,
                                                   clipSpaceIBounds);
         } else {
             result = this->createAlphaClipMask(genID,
                                                initialState,
                                                elements,
+                                               translate,
+                                               clipToMaskOffset,
                                                clipSpaceIBounds);
         }
 
         if (result) {
             // The mask's top left coord should be pinned to the rounded-out top left corner of
             // clipSpace bounds. We determine the mask's position WRT to the render target here.
             SkIRect rtSpaceMaskBounds = clipSpaceIBounds;
             rtSpaceMaskBounds.offset(-clipDataIn->fOrigin);
             setup_drawstate_aaclip(rtSpaceMaskBounds, drawState, result);
             this->setDrawStateStencil(drawState, ars);
@@ skipping 33 matching lines @@
 ////////////////////////////////////////////////////////////////////////////////
 // Set a coverage drawing XPF on the drawState for the given op and invertCoverage mode
 void set_coverage_drawing_xpf(SkRegion::Op op, bool invertCoverage, GrDrawState* drawState) {
     SkASSERT(op <= SkRegion::kLastOp);
     drawState->setCoverageSetOpXPFactory(op, invertCoverage);
 }
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 bool GrClipMaskManager::drawElement(GrDrawState* drawState,
+                                    const SkMatrix& viewMatrix,
                                     GrTexture* target,
                                     const SkClipStack::Element* element,
                                     GrPathRenderer* pr) {
     GrDrawTarget::AutoGeometryPush agp(fClipTarget);
 
     drawState->setRenderTarget(target->asRenderTarget());
 
     // The color we use to draw does not matter since we will always be using a GrCoverageSetOpXP
     // which ignores color.
     GrColor color = GrColor_WHITE;
 
     // TODO: Draw rrects directly here.
     switch (element->getType()) {
         case Element::kEmpty_Type:
             SkDEBUGFAIL("Should never get here with an empty element.");
             break;
         case Element::kRect_Type:
             // TODO: Do rects directly to the accumulator using a aa-rect GrProcessor that covers
             // the entire mask bounds and writes 0 outside the rect.
             if (element->isAA()) {
+                SkMatrix invert;
+                if (!viewMatrix.invert(&invert)) {
+                    SkDebugf("Could not invert\n");
+                    return false;
+                }
+                SkRect devRect = element->getRect();
+                viewMatrix.mapRect(&devRect);
                 this->getContext()->getAARectRenderer()->fillAARect(fClipTarget,
                                                                     drawState,
                                                                     color,
-                                                                    SkMatrix::I(),
+                                                                    viewMatrix,
+                                                                    invert,
                                                                     element->getRect(),
-                                                                    SkMatrix::I(),
-                                                                    element->getRect());
+                                                                    devRect);
             } else {
-                fClipTarget->drawSimpleRect(drawState, color, element->getRect());
+                fClipTarget->drawSimpleRect(drawState, color, viewMatrix, element->getRect());
             }
             return true;
         default: {
             SkPath path;
             element->asPath(&path);
             path.setIsVolatile(true);
             if (path.isInverseFillType()) {
                 path.toggleInverseFillType();
             }
             SkStrokeRec stroke(SkStrokeRec::kFill_InitStyle);
             if (NULL == pr) {
                 GrPathRendererChain::DrawType type;
                 type = element->isAA() ? GrPathRendererChain::kColorAntiAlias_DrawType :
                                          GrPathRendererChain::kColor_DrawType;
-                pr = this->getContext()->getPathRenderer(fClipTarget, drawState, path, stroke,
-                                                         false, type);
+                pr = this->getContext()->getPathRenderer(fClipTarget, drawState, viewMatrix, path,
+                                                         stroke, false, type);
             }
             if (NULL == pr) {
                 return false;
             }
 
-            pr->drawPath(fClipTarget, drawState, color, path, stroke, element->isAA());
+            pr->drawPath(fClipTarget, drawState, color, viewMatrix, path, stroke, element->isAA());
             break;
         }
     }
     return true;
 }
 
 bool GrClipMaskManager::canStencilAndDrawElement(GrDrawState* drawState,
                                                  GrTexture* target,
                                                  GrPathRenderer** pr,
                                                  const SkClipStack::Element* element) {
     drawState->setRenderTarget(target->asRenderTarget());
 
     if (Element::kRect_Type == element->getType()) {
         return true;
     } else {
         // We shouldn't get here with an empty clip element.
         SkASSERT(Element::kEmpty_Type != element->getType());
         SkPath path;
         element->asPath(&path);
         if (path.isInverseFillType()) {
             path.toggleInverseFillType();
         }
         SkStrokeRec stroke(SkStrokeRec::kFill_InitStyle);
         GrPathRendererChain::DrawType type = element->isAA() ?
             GrPathRendererChain::kStencilAndColorAntiAlias_DrawType :
             GrPathRendererChain::kStencilAndColor_DrawType;
-        *pr = this->getContext()->getPathRenderer(fClipTarget, drawState, path, stroke, false,
-                                                  type);
+        *pr = this->getContext()->getPathRenderer(fClipTarget, drawState, SkMatrix::I(), path,
+                                                  stroke, false, type);
         return SkToBool(*pr);
     }
 }
 
 void GrClipMaskManager::mergeMask(GrDrawState* drawState,
                                   GrTexture* dstMask,
                                   GrTexture* srcMask,
                                   SkRegion::Op op,
                                   const SkIRect& dstBound,
                                   const SkIRect& srcBound) {
     drawState->setRenderTarget(dstMask->asRenderTarget());
 
     // We want to invert the coverage here
     set_coverage_drawing_xpf(op, false, drawState);
 
     SkMatrix sampleM;
     sampleM.setIDiv(srcMask->width(), srcMask->height());
 
     drawState->addCoverageProcessor(
         GrTextureDomainEffect::Create(srcMask,
                                       sampleM,
                                       GrTextureDomain::MakeTexelDomain(srcMask, srcBound),
                                       GrTextureDomain::kDecal_Mode,
                                       GrTextureParams::kNone_FilterMode))->unref();
     // The color passed in here does not matter since the coverageSetOpXP won't read it.
-    fClipTarget->drawSimpleRect(drawState, GrColor_WHITE, SkRect::Make(dstBound));
+    fClipTarget->drawSimpleRect(drawState, GrColor_WHITE, SkMatrix::I(), SkRect::Make(dstBound));
 }
 
 GrTexture* GrClipMaskManager::createTempMask(int width, int height) {
     GrSurfaceDesc desc;
     desc.fFlags = kRenderTarget_GrSurfaceFlag;
     desc.fWidth = width;
     desc.fHeight = height;
     if (this->getContext()->isConfigRenderable(kAlpha_8_GrPixelConfig, false)) {
         desc.fConfig = kAlpha_8_GrPixelConfig;
     } else {
@@ skipping 37 matching lines @@
 
     fAACache.acquireMask(elementsGenID, desc, clipSpaceIBounds);
     return fAACache.getLastMask();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // Create a 8-bit clip mask in alpha
 GrTexture* GrClipMaskManager::createAlphaClipMask(int32_t elementsGenID,
                                                   GrReducedClip::InitialState initialState,
                                                   const GrReducedClip::ElementList& elements,
+                                                  const SkMatrix& translate,

[bsalomon, 2014/12/29 20:26:58]

Seems weird to pass essentially the same thing twice. Maybe recreate the
translate matrix in this function? Pretty minimal work and clear IMO.

+                                                  const SkVector& clipToMaskOffset,
                                                   const SkIRect& clipSpaceIBounds) {
     SkASSERT(kNone_ClipMaskType == fCurrClipMaskType);
 
     // First, check for cached texture
     GrTexture* result = this->getCachedMaskTexture(elementsGenID, clipSpaceIBounds);
     if (result) {
         fCurrClipMaskType = kAlpha_ClipMaskType;
         return result;
     }
 
     // There's no texture in the cache. Let's try to allocate it then.
     result = this->allocMaskTexture(elementsGenID, clipSpaceIBounds, false);
     if (NULL == result) {
         fAACache.reset();
         return NULL;
     }
 
-    // The top-left of the mask corresponds to the top-left corner of the bounds.
-    SkVector clipToMaskOffset = {
-        SkIntToScalar(-clipSpaceIBounds.fLeft),
-        SkIntToScalar(-clipSpaceIBounds.fTop)
-    };
     // The texture may be larger than necessary, this rect represents the part of the texture
     // we populate with a rasterization of the clip.
     SkIRect maskSpaceIBounds = SkIRect::MakeWH(clipSpaceIBounds.width(), clipSpaceIBounds.height());
 
-    // Set the matrix so that rendered clip elements are transformed to mask space from clip space.
-    SkMatrix translate;
-    translate.setTranslate(clipToMaskOffset);
-
     // The scratch texture that we are drawing into can be substantially larger than the mask. Only
     // clear the part that we care about.
     fClipTarget->clear(&maskSpaceIBounds,
                        GrReducedClip::kAllIn_InitialState == initialState ? 0xffffffff : 0x00000000,
                        true,
                        result->asRenderTarget());
 
     // When we use the stencil in the below loop it is important to have this clip installed.
     // The second pass that zeros the stencil buffer renders the rect maskSpaceIBounds so the first
     // pass must not set values outside of this bounds or stencil values outside the rect won't be
     // cleared.
     GrDrawTarget::AutoClipRestore acr(fClipTarget, maskSpaceIBounds);
     SkAutoTUnref<GrTexture> temp;
 
     // walk through each clip element and perform its set op
     for (GrReducedClip::ElementList::Iter iter = elements.headIter(); iter.get(); iter.next()) {
         const Element* element = iter.get();
         SkRegion::Op op = element->getOp();
         bool invert = element->isInverseFilled();
         if (invert || SkRegion::kIntersect_Op == op || SkRegion::kReverseDifference_Op == op) {
-            GrDrawState drawState(translate);
+            GrDrawState drawState;
             drawState.enableState(GrDrawState::kClip_StateBit);
 
             GrPathRenderer* pr = NULL;
             bool useTemp = !this->canStencilAndDrawElement(&drawState, result, &pr, element);
             GrTexture* dst;
             // This is the bounds of the clip element in the space of the alpha-mask. The temporary
             // mask buffer can be substantially larger than the actually clip stack element. We
             // touch the minimum number of pixels necessary and use decal mode to combine it with
             // the accumulator.
             SkIRect maskSpaceElementIBounds;
@@ skipping 30 matching lines @@
                                              kReplace_StencilOp,
                                              kReplace_StencilOp,
                                              kAlways_StencilFunc,
                                              0xffff,
                                              0xffff,
                                              0xffff);
                 drawState.setStencil(kStencilInElement);
                 set_coverage_drawing_xpf(op, invert, &drawState);
             }
 
-            if (!this->drawElement(&drawState, dst, element, pr)) {
+            if (!this->drawElement(&drawState, translate, dst, element, pr)) {
                 fAACache.reset();
                 return NULL;
             }
 
             if (useTemp) {
                 GrDrawState backgroundDrawState;
                 backgroundDrawState.enableState(GrDrawState::kClip_StateBit);
                 backgroundDrawState.setRenderTarget(result->asRenderTarget());
 
                 // Now draw into the accumulator using the real operation and the temp buffer as a
                 // texture
                 this->mergeMask(&backgroundDrawState,
                                 result,
                                 temp,
                                 op,
                                 maskSpaceIBounds,
                                 maskSpaceElementIBounds);
             } else {
-                GrDrawState backgroundDrawState(translate);
+                GrDrawState backgroundDrawState;
                 backgroundDrawState.enableState(GrDrawState::kClip_StateBit);
                 backgroundDrawState.setRenderTarget(result->asRenderTarget());
 
                 set_coverage_drawing_xpf(op, !invert, &backgroundDrawState);
                 // Draw to the exterior pixels (those with a zero stencil value).
                 GR_STATIC_CONST_SAME_STENCIL(kDrawOutsideElement,
                                              kZero_StencilOp,
                                              kZero_StencilOp,
                                              kEqual_StencilFunc,
                                              0xffff,
                                              0x0000,
                                              0xffff);
                 backgroundDrawState.setStencil(kDrawOutsideElement);
                 // The color passed in here does not matter since the coverageSetOpXP won't read it.
-                fClipTarget->drawSimpleRect(&backgroundDrawState, GrColor_WHITE, clipSpaceIBounds);
+                fClipTarget->drawSimpleRect(&backgroundDrawState, GrColor_WHITE, translate,
+                                            clipSpaceIBounds);
             }
         } else {
-            GrDrawState drawState(translate);
+            GrDrawState drawState;
             drawState.enableState(GrDrawState::kClip_StateBit);
 
             // all the remaining ops can just be directly draw into the accumulation buffer
             set_coverage_drawing_xpf(op, false, &drawState);
             // The color passed in here does not matter since the coverageSetOpXP won't read it.
-            this->drawElement(&drawState, result, element);
+            this->drawElement(&drawState, translate, result, element);
         }
     }
 
     fCurrClipMaskType = kAlpha_ClipMaskType;
     return result;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // Create a 1-bit clip mask in the stencil buffer. 'devClipBounds' are in device
 // (as opposed to canvas) coordinates
@@ skipping 12 matching lines @@
         return false;
     }
 
     if (stencilBuffer->mustRenderClip(elementsGenID, clipSpaceIBounds, clipSpaceToStencilOffset)) {
         stencilBuffer->setLastClip(elementsGenID, clipSpaceIBounds, clipSpaceToStencilOffset);
         // Set the matrix so that rendered clip elements are transformed from clip to stencil space.
         SkVector translate = {
             SkIntToScalar(clipSpaceToStencilOffset.fX),
             SkIntToScalar(clipSpaceToStencilOffset.fY)
         };
-        SkMatrix matrix;
-        matrix.setTranslate(translate);
+        SkMatrix viewMatrix;
+        viewMatrix.setTranslate(translate);
 
         // We set the current clip to the bounds so that our recursive draws are scissored to them.
         SkIRect stencilSpaceIBounds(clipSpaceIBounds);
         stencilSpaceIBounds.offset(clipSpaceToStencilOffset);
         GrDrawTarget::AutoClipRestore acr(fClipTarget, stencilSpaceIBounds);
 
         int clipBit = stencilBuffer->bits();
         SkASSERT((clipBit <= 16) && "Ganesh only handles 16b or smaller stencil buffers");
         clipBit = (1 << (clipBit-1));
 
         fClipTarget->clearStencilClip(stencilSpaceIBounds,
                                       GrReducedClip::kAllIn_InitialState == initialState,
                                       rt);
 
         // walk through each clip element and perform its set op
         // with the existing clip.
         for (GrReducedClip::ElementList::Iter iter(elements.headIter()); iter.get(); iter.next()) {
             const Element* element = iter.get();
 
-            GrDrawState drawState(matrix);
+            GrDrawState drawState;
             drawState.setRenderTarget(rt);
             drawState.enableState(GrDrawState::kClip_StateBit);
 
             drawState.setDisableColorXPFactory();
 
             // if the target is MSAA then we want MSAA enabled when the clip is soft
             if (rt->isMultisampled()) {
                 drawState.setState(GrDrawState::kHWAntialias_StateBit, element->isAA());
             }
 
@@ skipping 14 matching lines @@
                 stencilSupport = GrPathRenderer::kNoRestriction_StencilSupport;
                 fillInverted = false;
             } else {
                 element->asPath(&clipPath);
                 fillInverted = clipPath.isInverseFillType();
                 if (fillInverted) {
                     clipPath.toggleInverseFillType();
                 }
                 pr = this->getContext()->getPathRenderer(fClipTarget,
                                                          &drawState,
+                                                         viewMatrix,
                                                          clipPath,
                                                          stroke,
                                                          false,
                                                          GrPathRendererChain::kStencilOnly_DrawType,
                                                          &stencilSupport);
                 if (NULL == pr) {
                     return false;
                 }
             }
 
@@ skipping 17 matching lines @@
             if (!canDrawDirectToClip) {
                 GR_STATIC_CONST_SAME_STENCIL(gDrawToStencil,
                                              kIncClamp_StencilOp,
                                              kIncClamp_StencilOp,
                                              kAlways_StencilFunc,
                                              0xffff,
                                              0x0000,
                                              0xffff);
                 if (Element::kRect_Type == element->getType()) {
                     *drawState.stencil() = gDrawToStencil;
-                    fClipTarget->drawSimpleRect(&drawState, GrColor_WHITE, element->getRect());
+                    fClipTarget->drawSimpleRect(&drawState, GrColor_WHITE, viewMatrix,
+                                                element->getRect());
                 } else {
                     if (!clipPath.isEmpty()) {
                         GrDrawTarget::AutoGeometryPush agp(fClipTarget);
                         if (canRenderDirectToStencil) {
                             *drawState.stencil() = gDrawToStencil;
-                            pr->drawPath(fClipTarget, &drawState, GrColor_WHITE, clipPath, stroke,
-                                         false);
+                            pr->drawPath(fClipTarget, &drawState, GrColor_WHITE, viewMatrix,
+                                         clipPath, stroke, false);
                         } else {
-                            pr->stencilPath(fClipTarget, &drawState, clipPath, stroke);
+                            pr->stencilPath(fClipTarget, &drawState, viewMatrix, clipPath, stroke);
                         }
                     }
                 }
             }
 
             // now we modify the clip bit by rendering either the clip
             // element directly or a bounding rect of the entire clip.
             fClipMode = kModifyClip_StencilClipMode;
             for (int p = 0; p < passes; ++p) {
                 GrDrawState drawStateCopy(drawState);
                 *drawStateCopy.stencil() = stencilSettings[p];
 
                 if (canDrawDirectToClip) {
                     if (Element::kRect_Type == element->getType()) {
-                        fClipTarget->drawSimpleRect(&drawStateCopy, GrColor_WHITE,
+                        fClipTarget->drawSimpleRect(&drawStateCopy, GrColor_WHITE, viewMatrix,
                                                     element->getRect());
                     } else {
                         GrDrawTarget::AutoGeometryPush agp(fClipTarget);
-                        pr->drawPath(fClipTarget, &drawStateCopy, GrColor_WHITE, clipPath, stroke, false);
+                        pr->drawPath(fClipTarget, &drawStateCopy, GrColor_WHITE, viewMatrix,
+                                     clipPath, stroke, false);
                     }
                 } else {
                     // The view matrix is setup to do clip space -> stencil space translation, so
                     // draw rect in clip space.
-                    fClipTarget->drawSimpleRect(&drawStateCopy, GrColor_WHITE,
+                    fClipTarget->drawSimpleRect(&drawStateCopy, GrColor_WHITE, viewMatrix,
                                                 SkRect::Make(clipSpaceIBounds));
                 }
             }
         }
     }
     // set this last because recursive draws may overwrite it back to kNone.
     SkASSERT(kNone_ClipMaskType == fCurrClipMaskType);
     fCurrClipMaskType = kStencil_ClipMaskType;
     fClipMode = kRespectClip_StencilClipMode;
     return true;
@@ skipping 166 matching lines @@
     }
     if (!twoSided) {
         settings->copyFrontSettingsToBack();
     }
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 GrTexture* GrClipMaskManager::createSoftwareClipMask(int32_t elementsGenID,
                                                      GrReducedClip::InitialState initialState,
                                                      const GrReducedClip::ElementList& elements,
+                                                     const SkMatrix& translate,
                                                      const SkIRect& clipSpaceIBounds) {
     SkASSERT(kNone_ClipMaskType == fCurrClipMaskType);
 
     GrTexture* result = this->getCachedMaskTexture(elementsGenID, clipSpaceIBounds);
     if (result) {
         return result;
     }
 
     // The mask texture may be larger than necessary. We round out the clip space bounds and pin
     // the top left corner of the resulting rect to the top left of the texture.
     SkIRect maskSpaceIBounds = SkIRect::MakeWH(clipSpaceIBounds.width(), clipSpaceIBounds.height());
 
     GrSWMaskHelper helper(this->getContext());
 
-    SkMatrix matrix;
-    matrix.setTranslate(SkIntToScalar(-clipSpaceIBounds.fLeft),
-                        SkIntToScalar(-clipSpaceIBounds.fTop));
-
-    helper.init(maskSpaceIBounds, &matrix, false);
+    helper.init(maskSpaceIBounds, &translate, false);
     helper.clear(GrReducedClip::kAllIn_InitialState == initialState ? 0xFF : 0x00);
     SkStrokeRec stroke(SkStrokeRec::kFill_InitStyle);
 
     for (GrReducedClip::ElementList::Iter iter(elements.headIter()) ; iter.get(); iter.next()) {
         const Element* element = iter.get();
         SkRegion::Op op = element->getOp();
 
         if (SkRegion::kIntersect_Op == op || SkRegion::kReverseDifference_Op == op) {
             // Intersect and reverse difference require modifying pixels outside of the geometry
             // that is being "drawn". In both cases we erase all the pixels outside of the geometry
@@ skipping 45 matching lines @@
 }
 
 void GrClipMaskManager::adjustPathStencilParams(const GrStencilBuffer* stencilBuffer,
                                                 GrStencilSettings* settings) {
     // TODO: dynamically attach a stencil buffer
     if (stencilBuffer) {
         int stencilBits = stencilBuffer->bits();
         this->adjustStencilParams(settings, fClipMode, stencilBits);
     }
 }