summaryrefslogtreecommitdiffstats
path: root/gfx/2d/Helpers.h
diff options
context:
space:
mode:
Diffstat (limited to 'gfx/2d/Helpers.h')
-rw-r--r--gfx/2d/Helpers.h97
1 files changed, 97 insertions, 0 deletions
diff --git a/gfx/2d/Helpers.h b/gfx/2d/Helpers.h
new file mode 100644
index 000000000..11c7eec5d
--- /dev/null
+++ b/gfx/2d/Helpers.h
@@ -0,0 +1,97 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * 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_