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+/* -*- 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 final {
+ public:
+ AutoRestoreTransform() = default;
+
+ 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 final {
+ 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_