surfaceflinger: add BufferLayerConsumer
Copied from GLConsumer.{cpp,h}. Run sed and clang-format on them.
Minor fixes (incorrect header path, already defined macros) to make
them compile.
Make SurfaceFlingerConsumer inherit from BufferLayerConsumer.
Test: boots
Change-Id: I44ef6b15e77fb84b60ab788457a8ed0a1c784a95
diff --git a/services/surfaceflinger/BufferLayerConsumer.h b/services/surfaceflinger/BufferLayerConsumer.h
new file mode 100644
index 0000000..2b7c2a3
--- /dev/null
+++ b/services/surfaceflinger/BufferLayerConsumer.h
@@ -0,0 +1,508 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_BUFFERLAYERCONSUMER_H
+#define ANDROID_BUFFERLAYERCONSUMER_H
+
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
+
+#include <gui/BufferQueueDefs.h>
+#include <gui/ConsumerBase.h>
+
+#include <ui/FenceTime.h>
+#include <ui/GraphicBuffer.h>
+
+#include <utils/String8.h>
+#include <utils/Vector.h>
+#include <utils/threads.h>
+
+namespace android {
+// ----------------------------------------------------------------------------
+
+class String8;
+
+/*
+ * BufferLayerConsumer consumes buffers of graphics data from a BufferQueue,
+ * and makes them available to OpenGL as a texture.
+ *
+ * A typical usage pattern is to set up the BufferLayerConsumer with the
+ * desired options, and call updateTexImage() when a new frame is desired.
+ * If a new frame is available, the texture will be updated. If not,
+ * the previous contents are retained.
+ *
+ * By default, the texture is attached to the GL_TEXTURE_EXTERNAL_OES
+ * texture target, in the EGL context of the first thread that calls
+ * updateTexImage().
+ *
+ * This class was previously called SurfaceTexture.
+ */
+class BufferLayerConsumer : public ConsumerBase {
+public:
+ enum { TEXTURE_EXTERNAL = 0x8D65 }; // GL_TEXTURE_EXTERNAL_OES
+ typedef ConsumerBase::FrameAvailableListener FrameAvailableListener;
+
+ // BufferLayerConsumer constructs a new BufferLayerConsumer object. If the constructor with
+ // the tex parameter is used, tex indicates the name of the OpenGL ES
+ // texture to which images are to be streamed. texTarget specifies the
+ // OpenGL ES texture target to which the texture will be bound in
+ // updateTexImage. useFenceSync specifies whether fences should be used to
+ // synchronize access to buffers if that behavior is enabled at
+ // compile-time.
+ //
+ // A BufferLayerConsumer may be detached from one OpenGL ES context and then
+ // attached to a different context using the detachFromContext and
+ // attachToContext methods, respectively. The intention of these methods is
+ // purely to allow a BufferLayerConsumer to be transferred from one consumer
+ // context to another. If such a transfer is not needed there is no
+ // requirement that either of these methods be called.
+ //
+ // If the constructor with the tex parameter is used, the BufferLayerConsumer is
+ // created in a state where it is considered attached to an OpenGL ES
+ // context for the purposes of the attachToContext and detachFromContext
+ // methods. However, despite being considered "attached" to a context, the
+ // specific OpenGL ES context doesn't get latched until the first call to
+ // updateTexImage. After that point, all calls to updateTexImage must be
+ // made with the same OpenGL ES context current.
+ //
+ // If the constructor without the tex parameter is used, the BufferLayerConsumer is
+ // created in a detached state, and attachToContext must be called before
+ // calls to updateTexImage.
+ BufferLayerConsumer(const sp<IGraphicBufferConsumer>& bq, uint32_t tex, uint32_t texureTarget,
+ bool useFenceSync, bool isControlledByApp);
+
+ BufferLayerConsumer(const sp<IGraphicBufferConsumer>& bq, uint32_t texureTarget,
+ bool useFenceSync, bool isControlledByApp);
+
+ // updateTexImage acquires the most recently queued buffer, and sets the
+ // image contents of the target texture to it.
+ //
+ // This call may only be made while the OpenGL ES context to which the
+ // target texture belongs is bound to the calling thread.
+ //
+ // This calls doGLFenceWait to ensure proper synchronization.
+ status_t updateTexImage();
+
+ // releaseTexImage releases the texture acquired in updateTexImage().
+ // This is intended to be used in single buffer mode.
+ //
+ // This call may only be made while the OpenGL ES context to which the
+ // target texture belongs is bound to the calling thread.
+ status_t releaseTexImage();
+
+ // setReleaseFence stores a fence that will signal when the current buffer
+ // is no longer being read. This fence will be returned to the producer
+ // when the current buffer is released by updateTexImage(). Multiple
+ // fences can be set for a given buffer; they will be merged into a single
+ // union fence.
+ virtual void setReleaseFence(const sp<Fence>& fence);
+
+ // getTransformMatrix retrieves the 4x4 texture coordinate transform matrix
+ // associated with the texture image set by the most recent call to
+ // updateTexImage.
+ //
+ // This transform matrix maps 2D homogeneous texture coordinates of the form
+ // (s, t, 0, 1) with s and t in the inclusive range [0, 1] to the texture
+ // coordinate that should be used to sample that location from the texture.
+ // Sampling the texture outside of the range of this transform is undefined.
+ //
+ // This transform is necessary to compensate for transforms that the stream
+ // content producer may implicitly apply to the content. By forcing users of
+ // a BufferLayerConsumer to apply this transform we avoid performing an extra
+ // copy of the data that would be needed to hide the transform from the
+ // user.
+ //
+ // The matrix is stored in column-major order so that it may be passed
+ // directly to OpenGL ES via the glLoadMatrixf or glUniformMatrix4fv
+ // functions.
+ void getTransformMatrix(float mtx[16]);
+
+ // Computes the transform matrix documented by getTransformMatrix
+ // from the BufferItem sub parts.
+ static void computeTransformMatrix(float outTransform[16], const sp<GraphicBuffer>& buf,
+ const Rect& cropRect, uint32_t transform, bool filtering);
+
+ // Scale the crop down horizontally or vertically such that it has the
+ // same aspect ratio as the buffer does.
+ static Rect scaleDownCrop(const Rect& crop, uint32_t bufferWidth, uint32_t bufferHeight);
+
+ // getTimestamp retrieves the timestamp associated with the texture image
+ // set by the most recent call to updateTexImage.
+ //
+ // The timestamp is in nanoseconds, and is monotonically increasing. Its
+ // other semantics (zero point, etc) are source-dependent and should be
+ // documented by the source.
+ int64_t getTimestamp();
+
+ // getDataSpace retrieves the DataSpace associated with the texture image
+ // set by the most recent call to updateTexImage.
+ android_dataspace getCurrentDataSpace();
+
+ // getFrameNumber retrieves the frame number associated with the texture
+ // image set by the most recent call to updateTexImage.
+ //
+ // The frame number is an incrementing counter set to 0 at the creation of
+ // the BufferQueue associated with this consumer.
+ uint64_t getFrameNumber();
+
+ // setDefaultBufferSize is used to set the size of buffers returned by
+ // requestBuffers when a with and height of zero is requested.
+ // A call to setDefaultBufferSize() may trigger requestBuffers() to
+ // be called from the client.
+ // The width and height parameters must be no greater than the minimum of
+ // GL_MAX_VIEWPORT_DIMS and GL_MAX_TEXTURE_SIZE (see: glGetIntegerv).
+ // An error due to invalid dimensions might not be reported until
+ // updateTexImage() is called.
+ status_t setDefaultBufferSize(uint32_t width, uint32_t height);
+
+ // setFilteringEnabled sets whether the transform matrix should be computed
+ // for use with bilinear filtering.
+ void setFilteringEnabled(bool enabled);
+
+ // getCurrentBuffer returns the buffer associated with the current image.
+ // When outSlot is not nullptr, the current buffer slot index is also
+ // returned.
+ sp<GraphicBuffer> getCurrentBuffer(int* outSlot = nullptr) const;
+
+ // getCurrentTextureTarget returns the texture target of the current
+ // texture as returned by updateTexImage().
+ uint32_t getCurrentTextureTarget() const;
+
+ // getCurrentCrop returns the cropping rectangle of the current buffer.
+ Rect getCurrentCrop() const;
+
+ // getCurrentTransform returns the transform of the current buffer.
+ uint32_t getCurrentTransform() const;
+
+ // getCurrentScalingMode returns the scaling mode of the current buffer.
+ uint32_t getCurrentScalingMode() const;
+
+ // getCurrentFence returns the fence indicating when the current buffer is
+ // ready to be read from.
+ sp<Fence> getCurrentFence() const;
+
+ // getCurrentFence returns the FenceTime indicating when the current
+ // buffer is ready to be read from.
+ std::shared_ptr<FenceTime> getCurrentFenceTime() const;
+
+ // setConsumerUsageBits overrides the ConsumerBase method to OR
+ // DEFAULT_USAGE_FLAGS to usage.
+ status_t setConsumerUsageBits(uint64_t usage);
+
+ // detachFromContext detaches the BufferLayerConsumer from the calling thread's
+ // current OpenGL ES context. This context must be the same as the context
+ // that was current for previous calls to updateTexImage.
+ //
+ // Detaching a BufferLayerConsumer from an OpenGL ES context will result in the
+ // deletion of the OpenGL ES texture object into which the images were being
+ // streamed. After a BufferLayerConsumer has been detached from the OpenGL ES
+ // context calls to updateTexImage will fail returning INVALID_OPERATION
+ // until the BufferLayerConsumer is attached to a new OpenGL ES context using the
+ // attachToContext method.
+ status_t detachFromContext();
+
+ // attachToContext attaches a BufferLayerConsumer that is currently in the
+ // 'detached' state to the current OpenGL ES context. A BufferLayerConsumer is
+ // in the 'detached' state iff detachFromContext has successfully been
+ // called and no calls to attachToContext have succeeded since the last
+ // detachFromContext call. Calls to attachToContext made on a
+ // BufferLayerConsumer that is not in the 'detached' state will result in an
+ // INVALID_OPERATION error.
+ //
+ // The tex argument specifies the OpenGL ES texture object name in the
+ // new context into which the image contents will be streamed. A successful
+ // call to attachToContext will result in this texture object being bound to
+ // the texture target and populated with the image contents that were
+ // current at the time of the last call to detachFromContext.
+ status_t attachToContext(uint32_t tex);
+
+protected:
+ // abandonLocked overrides the ConsumerBase method to clear
+ // mCurrentTextureImage in addition to the ConsumerBase behavior.
+ virtual void abandonLocked();
+
+ // dumpLocked overrides the ConsumerBase method to dump BufferLayerConsumer-
+ // specific info in addition to the ConsumerBase behavior.
+ virtual void dumpLocked(String8& result, const char* prefix) const;
+
+ // acquireBufferLocked overrides the ConsumerBase method to update the
+ // mEglSlots array in addition to the ConsumerBase behavior.
+ virtual status_t acquireBufferLocked(BufferItem* item, nsecs_t presentWhen,
+ uint64_t maxFrameNumber = 0) override;
+
+ // releaseBufferLocked overrides the ConsumerBase method to update the
+ // mEglSlots array in addition to the ConsumerBase.
+ virtual status_t releaseBufferLocked(int slot, const sp<GraphicBuffer> graphicBuffer,
+ EGLDisplay display, EGLSyncKHR eglFence) override;
+
+ status_t releaseBufferLocked(int slot, const sp<GraphicBuffer> graphicBuffer,
+ EGLSyncKHR eglFence) {
+ return releaseBufferLocked(slot, graphicBuffer, mEglDisplay, eglFence);
+ }
+
+ struct PendingRelease {
+ PendingRelease()
+ : isPending(false),
+ currentTexture(-1),
+ graphicBuffer(),
+ display(nullptr),
+ fence(nullptr) {}
+
+ bool isPending;
+ int currentTexture;
+ sp<GraphicBuffer> graphicBuffer;
+ EGLDisplay display;
+ EGLSyncKHR fence;
+ };
+
+ // This releases the buffer in the slot referenced by mCurrentTexture,
+ // then updates state to refer to the BufferItem, which must be a
+ // newly-acquired buffer. If pendingRelease is not null, the parameters
+ // which would have been passed to releaseBufferLocked upon the successful
+ // completion of the method will instead be returned to the caller, so that
+ // it may call releaseBufferLocked itself later.
+ status_t updateAndReleaseLocked(const BufferItem& item,
+ PendingRelease* pendingRelease = nullptr);
+
+ // Binds mTexName and the current buffer to mTexTarget. Uses
+ // mCurrentTexture if it's set, mCurrentTextureImage if not. If the
+ // bind succeeds, this calls doGLFenceWait.
+ status_t bindTextureImageLocked();
+
+ // Gets the current EGLDisplay and EGLContext values, and compares them
+ // to mEglDisplay and mEglContext. If the fields have been previously
+ // set, the values must match; if not, the fields are set to the current
+ // values.
+ // The contextCheck argument is used to ensure that a GL context is
+ // properly set; when set to false, the check is not performed.
+ status_t checkAndUpdateEglStateLocked(bool contextCheck = false);
+
+private:
+ // EglImage is a utility class for tracking and creating EGLImageKHRs. There
+ // is primarily just one image per slot, but there is also special cases:
+ // - For releaseTexImage, we use a debug image (mReleasedTexImage)
+ // - After freeBuffer, we must still keep the current image/buffer
+ // Reference counting EGLImages lets us handle all these cases easily while
+ // also only creating new EGLImages from buffers when required.
+ class EglImage : public LightRefBase<EglImage> {
+ public:
+ EglImage(sp<GraphicBuffer> graphicBuffer);
+
+ // createIfNeeded creates an EGLImage if required (we haven't created
+ // one yet, or the EGLDisplay or crop-rect has changed).
+ status_t createIfNeeded(EGLDisplay display, const Rect& cropRect, bool forceCreate = false);
+
+ // This calls glEGLImageTargetTexture2DOES to bind the image to the
+ // texture in the specified texture target.
+ void bindToTextureTarget(uint32_t texTarget);
+
+ const sp<GraphicBuffer>& graphicBuffer() { return mGraphicBuffer; }
+ const native_handle* graphicBufferHandle() {
+ return mGraphicBuffer == NULL ? NULL : mGraphicBuffer->handle;
+ }
+
+ private:
+ // Only allow instantiation using ref counting.
+ friend class LightRefBase<EglImage>;
+ virtual ~EglImage();
+
+ // createImage creates a new EGLImage from a GraphicBuffer.
+ EGLImageKHR createImage(EGLDisplay dpy, const sp<GraphicBuffer>& graphicBuffer,
+ const Rect& crop);
+
+ // Disallow copying
+ EglImage(const EglImage& rhs);
+ void operator=(const EglImage& rhs);
+
+ // mGraphicBuffer is the buffer that was used to create this image.
+ sp<GraphicBuffer> mGraphicBuffer;
+
+ // mEglImage is the EGLImage created from mGraphicBuffer.
+ EGLImageKHR mEglImage;
+
+ // mEGLDisplay is the EGLDisplay that was used to create mEglImage.
+ EGLDisplay mEglDisplay;
+
+ // mCropRect is the crop rectangle passed to EGL when mEglImage
+ // was created.
+ Rect mCropRect;
+ };
+
+ // freeBufferLocked frees up the given buffer slot. If the slot has been
+ // initialized this will release the reference to the GraphicBuffer in that
+ // slot and destroy the EGLImage in that slot. Otherwise it has no effect.
+ //
+ // This method must be called with mMutex locked.
+ virtual void freeBufferLocked(int slotIndex);
+
+ // computeCurrentTransformMatrixLocked computes the transform matrix for the
+ // current texture. It uses mCurrentTransform and the current GraphicBuffer
+ // to compute this matrix and stores it in mCurrentTransformMatrix.
+ // mCurrentTextureImage must not be NULL.
+ void computeCurrentTransformMatrixLocked();
+
+ // doGLFenceWaitLocked inserts a wait command into the OpenGL ES command
+ // stream to ensure that it is safe for future OpenGL ES commands to
+ // access the current texture buffer.
+ status_t doGLFenceWaitLocked() const;
+
+ // syncForReleaseLocked performs the synchronization needed to release the
+ // current slot from an OpenGL ES context. If needed it will set the
+ // current slot's fence to guard against a producer accessing the buffer
+ // before the outstanding accesses have completed.
+ status_t syncForReleaseLocked(EGLDisplay dpy);
+
+ // returns a graphic buffer used when the texture image has been released
+ static sp<GraphicBuffer> getDebugTexImageBuffer();
+
+ // The default consumer usage flags that BufferLayerConsumer always sets on its
+ // BufferQueue instance; these will be OR:d with any additional flags passed
+ // from the BufferLayerConsumer user. In particular, BufferLayerConsumer will always
+ // consume buffers as hardware textures.
+ static const uint64_t DEFAULT_USAGE_FLAGS = GraphicBuffer::USAGE_HW_TEXTURE;
+
+ // mCurrentTextureImage is the EglImage/buffer of the current texture. It's
+ // possible that this buffer is not associated with any buffer slot, so we
+ // must track it separately in order to support the getCurrentBuffer method.
+ sp<EglImage> mCurrentTextureImage;
+
+ // mCurrentCrop is the crop rectangle that applies to the current texture.
+ // It gets set each time updateTexImage is called.
+ Rect mCurrentCrop;
+
+ // mCurrentTransform is the transform identifier for the current texture. It
+ // gets set each time updateTexImage is called.
+ uint32_t mCurrentTransform;
+
+ // mCurrentScalingMode is the scaling mode for the current texture. It gets
+ // set each time updateTexImage is called.
+ uint32_t mCurrentScalingMode;
+
+ // mCurrentFence is the fence received from BufferQueue in updateTexImage.
+ sp<Fence> mCurrentFence;
+
+ // The FenceTime wrapper around mCurrentFence.
+ std::shared_ptr<FenceTime> mCurrentFenceTime{FenceTime::NO_FENCE};
+
+ // mCurrentTransformMatrix is the transform matrix for the current texture.
+ // It gets computed by computeTransformMatrix each time updateTexImage is
+ // called.
+ float mCurrentTransformMatrix[16];
+
+ // mCurrentTimestamp is the timestamp for the current texture. It
+ // gets set each time updateTexImage is called.
+ int64_t mCurrentTimestamp;
+
+ // mCurrentDataSpace is the dataspace for the current texture. It
+ // gets set each time updateTexImage is called.
+ android_dataspace mCurrentDataSpace;
+
+ // mCurrentFrameNumber is the frame counter for the current texture.
+ // It gets set each time updateTexImage is called.
+ uint64_t mCurrentFrameNumber;
+
+ uint32_t mDefaultWidth, mDefaultHeight;
+
+ // mFilteringEnabled indicates whether the transform matrix is computed for
+ // use with bilinear filtering. It defaults to true and is changed by
+ // setFilteringEnabled().
+ bool mFilteringEnabled;
+
+ // mTexName is the name of the OpenGL texture to which streamed images will
+ // be bound when updateTexImage is called. It is set at construction time
+ // and can be changed with a call to attachToContext.
+ uint32_t mTexName;
+
+ // mUseFenceSync indicates whether creation of the EGL_KHR_fence_sync
+ // extension should be used to prevent buffers from being dequeued before
+ // it's safe for them to be written. It gets set at construction time and
+ // never changes.
+ const bool mUseFenceSync;
+
+ // mTexTarget is the GL texture target with which the GL texture object is
+ // associated. It is set in the constructor and never changed. It is
+ // almost always GL_TEXTURE_EXTERNAL_OES except for one use case in Android
+ // Browser. In that case it is set to GL_TEXTURE_2D to allow
+ // glCopyTexSubImage to read from the texture. This is a hack to work
+ // around a GL driver limitation on the number of FBO attachments, which the
+ // browser's tile cache exceeds.
+ const uint32_t mTexTarget;
+
+ // EGLSlot contains the information and object references that
+ // BufferLayerConsumer maintains about a BufferQueue buffer slot.
+ struct EglSlot {
+ EglSlot() : mEglFence(EGL_NO_SYNC_KHR) {}
+
+ // mEglImage is the EGLImage created from mGraphicBuffer.
+ sp<EglImage> mEglImage;
+
+ // mFence is the EGL sync object that must signal before the buffer
+ // associated with this buffer slot may be dequeued. It is initialized
+ // to EGL_NO_SYNC_KHR when the buffer is created and (optionally, based
+ // on a compile-time option) set to a new sync object in updateTexImage.
+ EGLSyncKHR mEglFence;
+ };
+
+ // mEglDisplay is the EGLDisplay with which this BufferLayerConsumer is currently
+ // associated. It is intialized to EGL_NO_DISPLAY and gets set to the
+ // current display when updateTexImage is called for the first time and when
+ // attachToContext is called.
+ EGLDisplay mEglDisplay;
+
+ // mEglContext is the OpenGL ES context with which this BufferLayerConsumer is
+ // currently associated. It is initialized to EGL_NO_CONTEXT and gets set
+ // to the current GL context when updateTexImage is called for the first
+ // time and when attachToContext is called.
+ EGLContext mEglContext;
+
+ // mEGLSlots stores the buffers that have been allocated by the BufferQueue
+ // for each buffer slot. It is initialized to null pointers, and gets
+ // filled in with the result of BufferQueue::acquire when the
+ // client dequeues a buffer from a
+ // slot that has not yet been used. The buffer allocated to a slot will also
+ // be replaced if the requested buffer usage or geometry differs from that
+ // of the buffer allocated to a slot.
+ EglSlot mEglSlots[BufferQueueDefs::NUM_BUFFER_SLOTS];
+
+ // mCurrentTexture is the buffer slot index of the buffer that is currently
+ // bound to the OpenGL texture. It is initialized to INVALID_BUFFER_SLOT,
+ // indicating that no buffer slot is currently bound to the texture. Note,
+ // however, that a value of INVALID_BUFFER_SLOT does not necessarily mean
+ // that no buffer is bound to the texture. A call to setBufferCount will
+ // reset mCurrentTexture to INVALID_BUFFER_SLOT.
+ int mCurrentTexture;
+
+ // mAttached indicates whether the ConsumerBase is currently attached to
+ // an OpenGL ES context. For legacy reasons, this is initialized to true,
+ // indicating that the ConsumerBase is considered to be attached to
+ // whatever context is current at the time of the first updateTexImage call.
+ // It is set to false by detachFromContext, and then set to true again by
+ // attachToContext.
+ bool mAttached;
+
+ // protects static initialization
+ static Mutex sStaticInitLock;
+
+ // mReleasedTexImageBuffer is a dummy buffer used when in single buffer
+ // mode and releaseTexImage() has been called
+ static sp<GraphicBuffer> sReleasedTexImageBuffer;
+ sp<EglImage> mReleasedTexImage;
+};
+
+// ----------------------------------------------------------------------------
+}; // namespace android
+
+#endif // ANDROID_BUFFERLAYERCONSUMER_H