7143316af2
This fixes the cycling rendering loop caused by nesting virtual displays by preventing them from recomposing if their contents haven't changed. Bug: 12101046 Change-Id: I600365c0fd5d3ad93e04295d26cf9de177ffc79b
86 lines
3.3 KiB
C++
86 lines
3.3 KiB
C++
/*
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* Copyright 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_SF_DISPLAY_SURFACE_H
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#define ANDROID_SF_DISPLAY_SURFACE_H
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#include <utils/Errors.h>
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#include <utils/RefBase.h>
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#include <utils/StrongPointer.h>
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// ---------------------------------------------------------------------------
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namespace android {
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// ---------------------------------------------------------------------------
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class IGraphicBufferProducer;
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class String8;
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class DisplaySurface : public virtual RefBase {
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public:
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// beginFrame is called at the beginning of the composition loop, before
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// the configuration is known. The DisplaySurface should do anything it
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// needs to do to enable HWComposer to decide how to compose the frame.
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// We pass in mustRecompose so we can keep VirtualDisplaySurface's state
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// machine happy without actually queueing a buffer if nothing has changed.
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virtual status_t beginFrame(bool mustRecompose) = 0;
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// prepareFrame is called after the composition configuration is known but
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// before composition takes place. The DisplaySurface can use the
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// composition type to decide how to manage the flow of buffers between
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// GLES and HWC for this frame.
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enum CompositionType {
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COMPOSITION_UNKNOWN = 0,
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COMPOSITION_GLES = 1,
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COMPOSITION_HWC = 2,
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COMPOSITION_MIXED = COMPOSITION_GLES | COMPOSITION_HWC
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};
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virtual status_t prepareFrame(CompositionType compositionType) = 0;
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// Should be called when composition rendering is complete for a frame (but
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// eglSwapBuffers hasn't necessarily been called). Required by certain
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// older drivers for synchronization.
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// TODO: Remove this when we drop support for HWC 1.0.
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virtual status_t compositionComplete() = 0;
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// Inform the surface that GLES composition is complete for this frame, and
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// the surface should make sure that HWComposer has the correct buffer for
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// this frame. Some implementations may only push a new buffer to
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// HWComposer if GLES composition took place, others need to push a new
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// buffer on every frame.
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//
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// advanceFrame must be followed by a call to onFrameCommitted before
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// advanceFrame may be called again.
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virtual status_t advanceFrame() = 0;
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// onFrameCommitted is called after the frame has been committed to the
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// hardware composer. The surface collects the release fence for this
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// frame's buffer.
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virtual void onFrameCommitted() = 0;
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virtual void dump(String8& result) const = 0;
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protected:
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DisplaySurface() {}
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virtual ~DisplaySurface() {}
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};
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// ---------------------------------------------------------------------------
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} // namespace android
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// ---------------------------------------------------------------------------
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#endif // ANDROID_SF_DISPLAY_SURFACE_H
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