gfx/2d/Helpers.h
author Brian Hackett <bhackett1024@gmail.com>
Thu, 27 Dec 2018 13:24:55 -1000
changeset 453697 e2af5f75beaf4ec851514352d62ff6f4b8a1d037
parent 448947 6f3709b3878117466168c40affa7bca0b60cf75b
child 469134 884f5dc55873c9345ee945cd6d5427e8ab398071
permissions -rw-r--r--
Bug 1516578 Part 1 - Merge HitCheckpoint and HitBreakpoint messages, r=mccr8.

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef MOZILLA_GFX_2D_HELPERS_H_
#define MOZILLA_GFX_2D_HELPERS_H_

#include "2D.h"

namespace mozilla {
namespace gfx {

class AutoRestoreTransform {
 public:
  AutoRestoreTransform() {}

  explicit AutoRestoreTransform(DrawTarget *aTarget)
      : mDrawTarget(aTarget), mOldTransform(aTarget->GetTransform()) {}

  void Init(DrawTarget *aTarget) {
    MOZ_ASSERT(!mDrawTarget || aTarget == mDrawTarget);
    if (!mDrawTarget) {
      mDrawTarget = aTarget;
      mOldTransform = aTarget->GetTransform();
    }
  }

  ~AutoRestoreTransform() {
    if (mDrawTarget) {
      mDrawTarget->SetTransform(mOldTransform);
    }
  }

 private:
  RefPtr<DrawTarget> mDrawTarget;
  Matrix mOldTransform;
};

class AutoPopClips {
 public:
  explicit AutoPopClips(DrawTarget *aTarget)
      : mDrawTarget(aTarget), mPushCount(0) {
    MOZ_ASSERT(mDrawTarget);
  }

  ~AutoPopClips() { PopAll(); }

  void PushClip(const Path *aPath) {
    mDrawTarget->PushClip(aPath);
    ++mPushCount;
  }

  void PushClipRect(const Rect &aRect) {
    mDrawTarget->PushClipRect(aRect);
    ++mPushCount;
  }

  void PopClip() {
    MOZ_ASSERT(mPushCount > 0);
    mDrawTarget->PopClip();
    --mPushCount;
  }

  void PopAll() {
    while (mPushCount-- > 0) {
      mDrawTarget->PopClip();
    }
  }

 private:
  RefPtr<DrawTarget> mDrawTarget;
  int32_t mPushCount;
};

}  // namespace gfx
}  // namespace mozilla

#endif  // MOZILLA_GFX_2D_HELPERS_H_