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37 lines
1.3 KiB
Java
37 lines
1.3 KiB
Java
/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
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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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package org.mozilla.gecko.gfx;
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public class VirtualLayer extends Layer {
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public VirtualLayer(IntSize size) {
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super(size);
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}
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@Override
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public void draw(RenderContext context) {
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// No-op.
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}
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void setPositionAndResolution(int left, int top, int right, int bottom, float newResolution) {
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// This is an optimized version of the following code:
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// beginTransaction();
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// try {
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// setPosition(new Rect(left, top, right, bottom));
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// setResolution(newResolution);
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// performUpdates(null);
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// } finally {
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// endTransaction();
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// }
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// it is safe to drop the transaction lock in this instance (i.e. for the
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// VirtualLayer that is just a shadow of what gecko is painting) because
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// the position and resolution of this layer are always touched on the compositor
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// thread, and therefore do not require synchronization.
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mPosition.set(left, top, right, bottom);
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mResolution = newResolution;
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}
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}
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