98 lines
1.7 KiB
C++
98 lines
1.7 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef MOZILLA_GFX_2D_HELPERS_H_
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#define MOZILLA_GFX_2D_HELPERS_H_
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#include "2D.h"
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namespace mozilla {
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namespace gfx {
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class AutoRestoreTransform
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{
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public:
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AutoRestoreTransform()
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{
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}
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explicit AutoRestoreTransform(DrawTarget *aTarget)
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: mDrawTarget(aTarget),
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mOldTransform(aTarget->GetTransform())
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{
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}
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void Init(DrawTarget *aTarget)
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{
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MOZ_ASSERT(!mDrawTarget || aTarget == mDrawTarget);
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if (!mDrawTarget) {
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mDrawTarget = aTarget;
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mOldTransform = aTarget->GetTransform();
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}
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}
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~AutoRestoreTransform()
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{
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if (mDrawTarget) {
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mDrawTarget->SetTransform(mOldTransform);
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}
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}
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private:
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RefPtr<DrawTarget> mDrawTarget;
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Matrix mOldTransform;
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};
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class AutoPopClips
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{
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public:
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explicit AutoPopClips(DrawTarget *aTarget)
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: mDrawTarget(aTarget)
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, mPushCount(0)
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{
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MOZ_ASSERT(mDrawTarget);
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}
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~AutoPopClips()
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{
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PopAll();
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}
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void PushClip(const Path *aPath)
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{
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mDrawTarget->PushClip(aPath);
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++mPushCount;
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}
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void PushClipRect(const Rect &aRect)
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{
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mDrawTarget->PushClipRect(aRect);
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++mPushCount;
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}
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void PopClip()
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{
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MOZ_ASSERT(mPushCount > 0);
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mDrawTarget->PopClip();
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--mPushCount;
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}
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void PopAll()
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{
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while (mPushCount-- > 0) {
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mDrawTarget->PopClip();
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}
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}
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private:
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RefPtr<DrawTarget> mDrawTarget;
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int32_t mPushCount;
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};
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} // namespace gfx
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} // namespace mozilla
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#endif // MOZILLA_GFX_2D_HELPERS_H_
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