remove fClipStack and attach/deattach-from-canvas

src/pdf/SkPDFDevice.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkPDFDevice.h"
 #include "SkAnnotationKeys.h"
 #include "SkBitmapDevice.h"
@@ skipping 635 matching lines @@
     }
 };
 
 ////////////////////////////////////////////////////////////////////////////////
 
 SkPDFDevice::SkPDFDevice(SkISize pageSize, SkScalar rasterDpi, SkPDFDocument* doc, bool flip)
     : INHERITED(SkSurfaceProps(0, kUnknown_SkPixelGeometry))
     , fPageSize(pageSize)
     , fContentSize(pageSize)
     , fExistingClipRegion(SkIRect::MakeSize(pageSize))
-    , fClipStack(nullptr)
     , fRasterDpi(rasterDpi)
     , fDocument(doc) {
     SkASSERT(pageSize.width() > 0);
     SkASSERT(pageSize.height() > 0);
 
     if (flip) {
         // Skia generally uses the top left as the origin but PDF
         // natively has the origin at the bottom left. This matrix
         // corrects for that.  But that only needs to be done once, we
         // don't do it when layering.
@@ skipping 731 matching lines @@
     auto xObject = sk_make_sp<SkPDFFormXObject>(pdfDevice);
     SkPDFUtils::DrawFormXObject(this->addXObjectResource(xObject.get()),
                                 &content.entry()->fContent);
 }
 
 SkImageInfo SkPDFDevice::imageInfo() const {
     SkImageInfo info = SkImageInfo::MakeUnknown(fPageSize.width(), fPageSize.height());
     return info;
 }
 
-void SkPDFDevice::onAttachToCanvas(SkCanvas* canvas) {
-    INHERITED::onAttachToCanvas(canvas);
-
-    // Canvas promises that this ptr is valid until onDetachFromCanvas is called
-    fClipStack = canvas->getClipStack();
-}
-
-void SkPDFDevice::onDetachFromCanvas() {
-    INHERITED::onDetachFromCanvas();
-
-    fClipStack = nullptr;
-}
-
 sk_sp<SkSurface> SkPDFDevice::makeSurface(const SkImageInfo& info, const SkSurfaceProps& props) {
     return SkSurface::MakeRaster(info, &props);
 }
 
 
 sk_sp<SkPDFDict> SkPDFDevice::makeResourceDict() const {
     SkTDArray<SkPDFObject*> fonts;
     fonts.setReserve(fFontResources.count());
     for (SkPDFFont* font : fFontResources) {
         fonts.push(font);
@@ skipping 824 matching lines @@
 }
 
 sk_sp<SkSpecialImage> SkPDFDevice::makeSpecial(const SkImage* image) {
     return SkSpecialImage::MakeFromImage(SkIRect::MakeWH(image->width(), image->height()),
                                          image->makeNonTextureImage());
 }
 
 sk_sp<SkSpecialImage> SkPDFDevice::snapSpecial() {
     return nullptr;
 }