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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_