Cull pushCull and popCull from Skia.

src/core/SkCanvas.cpp

 /*
  * Copyright 2008 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkCanvas.h"
 #include "SkCanvasDrawable.h"
 #include "SkCanvasPriv.h"
@@ skipping 399 matching lines @@
 
 SkBaseDevice* SkCanvas::init(SkBaseDevice* device, InitFlags flags) {
     fConservativeRasterClip = SkToBool(flags & kConservativeRasterClip_InitFlag);
     fCachedLocalClipBounds.setEmpty();
     fCachedLocalClipBoundsDirty = true;
     fAllowSoftClip = true;
     fAllowSimplifyClip = false;
     fDeviceCMDirty = true;
     fSaveCount = 1;
     fSaveLayerCount = 0;
-    fCullCount = 0;
     fMetaData = NULL;
 
     fMCRec = (MCRec*)fMCStack.push_back();
     new (fMCRec) MCRec(fConservativeRasterClip);
 
     fMCRec->fLayer = SkNEW_ARGS(DeviceCM, (NULL, 0, 0, NULL, NULL, fConservativeRasterClip));
     fMCRec->fTopLayer = fMCRec->fLayer;
 
     fSurfaceBase = NULL;
 
@@ skipping 258 matching lines @@
     }
     return true;
 }
 
 bool SkCanvas::readPixels(const SkImageInfo& dstInfo, void* dstP, size_t rowBytes, int x, int y) {
     SkBaseDevice* device = this->getDevice();
     if (!device) {
         return false;
     }
     const SkISize size = this->getBaseLayerSize();
-    
+
     SkReadPixelsRec rec(dstInfo, dstP, rowBytes, x, y);
     if (!rec.trim(size.width(), size.height())) {
         return false;
     }
 
     // The device can assert that the requested area is always contained in its bounds
     return device->readPixels(rec.fInfo, rec.fPixels, rec.fRowBytes, rec.fX, rec.fY);
 }
 
 bool SkCanvas::writePixels(const SkBitmap& bitmap, int x, int y) {
@@ skipping 127 matching lines @@
             this->didRestore();
         }
     }
 }
 
 void SkCanvas::restoreToCount(int count) {
     // sanity check
     if (count < 1) {
         count = 1;
     }
-    
+
     int n = this->getSaveCount() - count;
     for (int i = 0; i < n; ++i) {
         this->restore();
     }
 }
 
 void SkCanvas::internalSave() {
     MCRec* newTop = (MCRec*)fMCStack.push_back();
     new (newTop) MCRec(*fMCRec);    // balanced in restore()
     fMCRec = newTop;
@@ skipping 254 matching lines @@
 
 bool SkAutoROCanvasPixels::asROBitmap(SkBitmap* bitmap) const {
     if (fAddr) {
         return bitmap->installPixels(fInfo, const_cast<void*>(fAddr), fRowBytes);
     } else {
         bitmap->reset();
         return false;
     }
 }
 
-void SkCanvas::onPushCull(const SkRect& cullRect) {
-    // do nothing. Subclasses may do something
-}
-
-void SkCanvas::onPopCull() {
-    // do nothing. Subclasses may do something
-}
-
-/////////////////////////////////////////////////////////////////////////////
-#ifdef SK_DEBUG
-// Ensure that cull rects are monotonically nested in device space.
-void SkCanvas::validateCull(const SkIRect& devCull) {
-    if (fCullStack.isEmpty()
-        || devCull.isEmpty()
-        || fCullStack.top().contains(devCull)) {
-        return;
-    }
-
-    SkDEBUGF(("Invalid cull: [%d %d %d %d] (previous cull: [%d %d %d %d])\n",
-              devCull.x(), devCull.y(), devCull.right(), devCull.bottom(),
-              fCullStack.top().x(), fCullStack.top().y(),
-              fCullStack.top().right(), fCullStack.top().bottom()));
-
-#ifdef ASSERT_NESTED_CULLING
-    SkDEBUGFAIL("Invalid cull.");
-#endif
-}
-#endif
-
-void SkCanvas::pushCull(const SkRect& cullRect) {
-    this->checkForDeferredSave();
-    ++fCullCount;
-    this->onPushCull(cullRect);
-
-#ifdef SK_DEBUG
-    // Map the cull rect into device space.
-    SkRect mappedCull;
-    this->getTotalMatrix().mapRect(&mappedCull, cullRect);
-
-    // Take clipping into account.
-    SkIRect devClip, devCull;
-    mappedCull.roundOut(&devCull);
-    this->getClipDeviceBounds(&devClip);
-    if (!devCull.intersect(devClip)) {
-        devCull.setEmpty();
-    }
-
-    this->validateCull(devCull);
-    fCullStack.push(devCull); // balanced in popCull
-#endif
-}
-
-void SkCanvas::popCull() {
-    SkASSERT(fCullStack.count() == fCullCount);
-
-    if (fCullCount > 0) {
-        --fCullCount;
-        this->onPopCull();
-
-        SkDEBUGCODE(fCullStack.pop());
-    }
-}
-
 /////////////////////////////////////////////////////////////////////////////
-
 void SkCanvas::internalDrawBitmap(const SkBitmap& bitmap,
                                 const SkMatrix& matrix, const SkPaint* paint) {
     if (bitmap.drawsNothing()) {
         return;
     }
 
     SkLazyPaint lazy;
     if (NULL == paint) {
         paint = lazy.init();
     }
@@ skipping 1370 matching lines @@
     }
 
     if (matrix) {
         canvas->concat(*matrix);
     }
 }
 
 SkAutoCanvasMatrixPaint::~SkAutoCanvasMatrixPaint() {
     fCanvas->restoreToCount(fSaveCount);
 }