michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef DEBUG
michael@0: static_assert(false, "This should not be compiled in !DEBUG");
michael@0: #endif // DEBUG
michael@0: 
michael@0: #include "nsAutoLayoutPhase.h"
michael@0: #include "nsPresContext.h"
michael@0: #include "nsContentUtils.h"
michael@0: 
michael@0: nsAutoLayoutPhase::nsAutoLayoutPhase(nsPresContext* aPresContext,
michael@0:                                      nsLayoutPhase aPhase)
michael@0:   : mPresContext(aPresContext)
michael@0:   , mPhase(aPhase)
michael@0:   , mCount(0)
michael@0: {
michael@0:   Enter();
michael@0: }
michael@0: 
michael@0: nsAutoLayoutPhase::~nsAutoLayoutPhase()
michael@0: {
michael@0:   Exit();
michael@0:   MOZ_ASSERT(mCount == 0, "imbalanced");
michael@0: }
michael@0: 
michael@0: void
michael@0: nsAutoLayoutPhase::Enter()
michael@0: {
michael@0:   switch (mPhase) {
michael@0:     case eLayoutPhase_Paint:
michael@0:       MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_Paint] == 0,
michael@0:                  "recurring into paint");
michael@0:       MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_Reflow] == 0,
michael@0:                  "painting in the middle of reflow");
michael@0:       MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_FrameC] == 0,
michael@0:                  "painting in the middle of frame construction");
michael@0:       break;
michael@0:     case eLayoutPhase_Reflow:
michael@0:       MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_Paint] == 0,
michael@0:                  "reflowing in the middle of a paint");
michael@0:       MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_Reflow] == 0,
michael@0:                  "recurring into reflow");
michael@0:       MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_FrameC] == 0,
michael@0:                  "reflowing in the middle of frame construction");
michael@0:       break;
michael@0:     case eLayoutPhase_FrameC:
michael@0:       MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_Paint] == 0,
michael@0:                  "constructing frames in the middle of a paint");
michael@0:       MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_Reflow] == 0,
michael@0:                  "constructing frames in the middle of reflow");
michael@0:       MOZ_ASSERT(mPresContext->mLayoutPhaseCount[eLayoutPhase_FrameC] == 0,
michael@0:                  "recurring into frame construction");
michael@0:       MOZ_ASSERT(!nsContentUtils::IsSafeToRunScript(),
michael@0:                  "constructing frames and scripts are not blocked");
michael@0:       break;
michael@0:     case eLayoutPhase_COUNT:
michael@0:       break;
michael@0:   }
michael@0: 
michael@0:   ++(mPresContext->mLayoutPhaseCount[mPhase]);
michael@0:   ++mCount;
michael@0: }
michael@0: 
michael@0: void
michael@0: nsAutoLayoutPhase::Exit()
michael@0: {
michael@0:   MOZ_ASSERT(mCount > 0 && mPresContext->mLayoutPhaseCount[mPhase] > 0,
michael@0:              "imbalanced");
michael@0:   --(mPresContext->mLayoutPhaseCount[mPhase]);
michael@0:   --mCount;
michael@0: }