tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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Helpers.h (1775B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #ifndef MOZILLA_GFX_2D_HELPERS_H_
      8 #define MOZILLA_GFX_2D_HELPERS_H_
      9 
     10 #include "2D.h"
     11 
     12 namespace mozilla {
     13 namespace gfx {
     14 
     15 class AutoRestoreTransform final {
     16 public:
     17  AutoRestoreTransform() = default;
     18 
     19  explicit AutoRestoreTransform(DrawTarget* aTarget)
     20      : mDrawTarget(aTarget), mOldTransform(aTarget->GetTransform()) {}
     21 
     22  void Init(DrawTarget* aTarget) {
     23    MOZ_ASSERT(!mDrawTarget || aTarget == mDrawTarget);
     24    if (!mDrawTarget) {
     25      mDrawTarget = aTarget;
     26      mOldTransform = aTarget->GetTransform();
     27    }
     28  }
     29 
     30  ~AutoRestoreTransform() {
     31    if (mDrawTarget) {
     32      mDrawTarget->SetTransform(mOldTransform);
     33    }
     34  }
     35 
     36 private:
     37  RefPtr<DrawTarget> mDrawTarget;
     38  Matrix mOldTransform;
     39 };
     40 
     41 class AutoPopClips final {
     42 public:
     43  explicit AutoPopClips(DrawTarget* aTarget)
     44      : mDrawTarget(aTarget), mPushCount(0) {
     45    MOZ_ASSERT(mDrawTarget);
     46  }
     47 
     48  ~AutoPopClips() { PopAll(); }
     49 
     50  void PushClip(const Path* aPath) {
     51    mDrawTarget->PushClip(aPath);
     52    ++mPushCount;
     53  }
     54 
     55  void PushClipRect(const Rect& aRect) {
     56    mDrawTarget->PushClipRect(aRect);
     57    ++mPushCount;
     58  }
     59 
     60  void PopClip() {
     61    MOZ_ASSERT(mPushCount > 0);
     62    mDrawTarget->PopClip();
     63    --mPushCount;
     64  }
     65 
     66  void PopAll() {
     67    while (mPushCount-- > 0) {
     68      mDrawTarget->PopClip();
     69    }
     70  }
     71 
     72 private:
     73  RefPtr<DrawTarget> mDrawTarget;
     74  int32_t mPushCount;
     75 };
     76 
     77 }  // namespace gfx
     78 }  // namespace mozilla
     79 
     80 #endif  // MOZILLA_GFX_2D_HELPERS_H_