313 lines
13 KiB
C++
313 lines
13 KiB
C++
/*
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* Copyright (C) 2010 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_GUI_SURFACETEXTURE_H
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#define ANDROID_GUI_SURFACETEXTURE_H
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#include <EGL/egl.h>
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#include <EGL/eglext.h>
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#include <GLES2/gl2.h>
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#include <gui/ISurfaceTexture.h>
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#include <ui/GraphicBuffer.h>
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#include <utils/threads.h>
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#include <utils/Vector.h>
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#define ANDROID_GRAPHICS_SURFACETEXTURE_JNI_ID "mSurfaceTexture"
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namespace android {
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// ----------------------------------------------------------------------------
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class IGraphicBufferAlloc;
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class SurfaceTexture : public BnSurfaceTexture {
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public:
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enum { MIN_UNDEQUEUED_BUFFERS = 2 };
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enum { MIN_BUFFER_SLOTS = MIN_UNDEQUEUED_BUFFERS + 1 };
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enum { NUM_BUFFER_SLOTS = 32 };
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struct FrameAvailableListener : public virtual RefBase {
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virtual void onFrameAvailable() = 0;
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};
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// tex indicates the name OpenGL texture to which images are to be streamed.
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// This texture name cannot be changed once the SurfaceTexture is created.
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SurfaceTexture(GLuint tex);
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virtual ~SurfaceTexture();
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// setBufferCount updates the number of available buffer slots. After
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// calling this all buffer slots are both unallocated and owned by the
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// SurfaceTexture object (i.e. they are not owned by the client).
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virtual status_t setBufferCount(int bufferCount);
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virtual sp<GraphicBuffer> requestBuffer(int buf);
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// dequeueBuffer gets the next buffer slot index for the client to use. If a
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// buffer slot is available then that slot index is written to the location
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// pointed to by the buf argument and a status of OK is returned. If no
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// slot is available then a status of -EBUSY is returned and buf is
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// unmodified.
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virtual status_t dequeueBuffer(int *buf, uint32_t w, uint32_t h,
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uint32_t format, uint32_t usage);
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// queueBuffer returns a filled buffer to the SurfaceTexture. In addition, a
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// timestamp must be provided for the buffer. The timestamp is in
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// nanoseconds, and must be monotonically increasing. Its other semantics
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// (zero point, etc) are client-dependent and should be documented by the
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// client.
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virtual status_t queueBuffer(int buf, int64_t timestamp);
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virtual void cancelBuffer(int buf);
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virtual status_t setCrop(const Rect& reg);
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virtual status_t setTransform(uint32_t transform);
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virtual int query(int what, int* value);
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// updateTexImage sets the image contents of the target texture to that of
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// the most recently queued buffer.
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//
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// This call may only be made while the OpenGL ES context to which the
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// target texture belongs is bound to the calling thread.
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status_t updateTexImage();
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// getTransformMatrix retrieves the 4x4 texture coordinate transform matrix
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// associated with the texture image set by the most recent call to
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// updateTexImage.
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//
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// This transform matrix maps 2D homogeneous texture coordinates of the form
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// (s, t, 0, 1) with s and t in the inclusive range [0, 1] to the texture
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// coordinate that should be used to sample that location from the texture.
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// Sampling the texture outside of the range of this transform is undefined.
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//
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// This transform is necessary to compensate for transforms that the stream
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// content producer may implicitly apply to the content. By forcing users of
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// a SurfaceTexture to apply this transform we avoid performing an extra
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// copy of the data that would be needed to hide the transform from the
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// user.
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//
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// The matrix is stored in column-major order so that it may be passed
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// directly to OpenGL ES via the glLoadMatrixf or glUniformMatrix4fv
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// functions.
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void getTransformMatrix(float mtx[16]);
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// getTimestamp retrieves the timestamp associated with the texture image
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// set by the most recent call to updateTexImage.
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//
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// The timestamp is in nanoseconds, and is monotonically increasing. Its
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// other semantics (zero point, etc) are source-dependent and should be
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// documented by the source.
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int64_t getTimestamp();
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// setFrameAvailableListener sets the listener object that will be notified
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// when a new frame becomes available.
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void setFrameAvailableListener(const sp<FrameAvailableListener>& l);
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// getAllocator retrieves the binder object that must be referenced as long
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// as the GraphicBuffers dequeued from this SurfaceTexture are referenced.
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// Holding this binder reference prevents SurfaceFlinger from freeing the
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// buffers before the client is done with them.
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sp<IBinder> getAllocator();
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// setDefaultBufferSize is used to set the size of buffers returned by
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// requestBuffers when a with and height of zero is requested.
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// A call to setDefaultBufferSize() may trigger requestBuffers() to
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// be called from the client.
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status_t setDefaultBufferSize(uint32_t w, uint32_t h);
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// getCurrentBuffer returns the buffer associated with the current image.
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sp<GraphicBuffer> getCurrentBuffer() const;
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// getCurrentTextureTarget returns the texture target of the current
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// texture as returned by updateTexImage().
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GLenum getCurrentTextureTarget() const;
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// getCurrentCrop returns the cropping rectangle of the current buffer
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Rect getCurrentCrop() const;
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// getCurrentTransform returns the transform of the current buffer
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uint32_t getCurrentTransform() const;
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// setSynchronousMode set whether dequeueBuffer is synchronous or
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// asynchronous. In synchronous mode, dequeueBuffer blocks until
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// a buffer is available, the currently bound buffer can be dequeued and
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// queued buffers will be retired in order.
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// The default mode is asynchronous.
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status_t setSynchronousMode(bool enabled);
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protected:
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// freeAllBuffers frees the resources (both GraphicBuffer and EGLImage) for
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// all slots.
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void freeAllBuffers();
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static bool isExternalFormat(uint32_t format);
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static GLenum getTextureTarget(uint32_t format);
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private:
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// createImage creates a new EGLImage from a GraphicBuffer.
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EGLImageKHR createImage(EGLDisplay dpy,
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const sp<GraphicBuffer>& graphicBuffer);
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enum { INVALID_BUFFER_SLOT = -1 };
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struct BufferSlot {
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BufferSlot()
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: mEglImage(EGL_NO_IMAGE_KHR),
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mEglDisplay(EGL_NO_DISPLAY),
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mBufferState(BufferSlot::FREE),
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mRequestBufferCalled(false),
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mLastQueuedTransform(0),
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mLastQueuedTimestamp(0) {
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}
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// mGraphicBuffer points to the buffer allocated for this slot or is NULL
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// if no buffer has been allocated.
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sp<GraphicBuffer> mGraphicBuffer;
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// mEglImage is the EGLImage created from mGraphicBuffer.
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EGLImageKHR mEglImage;
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// mEglDisplay is the EGLDisplay used to create mEglImage.
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EGLDisplay mEglDisplay;
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// mBufferState indicates whether the slot is currently accessible to a
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// client and should not be used by the SurfaceTexture object. It gets
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// set to true when dequeueBuffer returns the slot and is reset to false
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// when the client calls either queueBuffer or cancelBuffer on the slot.
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enum { DEQUEUED=-2, FREE=-1, QUEUED=0 };
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int8_t mBufferState;
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// mRequestBufferCalled is used for validating that the client did
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// call requestBuffer() when told to do so. Technically this is not
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// needed but useful for debugging and catching client bugs.
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bool mRequestBufferCalled;
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// mLastQueuedCrop is the crop rectangle for the buffer that was most
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// recently queued. This gets set to mNextCrop each time queueBuffer gets
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// called.
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Rect mLastQueuedCrop;
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// mLastQueuedTransform is the transform identifier for the buffer that was
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// most recently queued. This gets set to mNextTransform each time
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// queueBuffer gets called.
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uint32_t mLastQueuedTransform;
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// mLastQueuedTimestamp is the timestamp for the buffer that was most
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// recently queued. This gets set by queueBuffer.
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int64_t mLastQueuedTimestamp;
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};
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// mSlots is the array of buffer slots that must be mirrored on the client
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// side. This allows buffer ownership to be transferred between the client
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// and server without sending a GraphicBuffer over binder. The entire array
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// is initialized to NULL at construction time, and buffers are allocated
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// for a slot when requestBuffer is called with that slot's index.
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BufferSlot mSlots[NUM_BUFFER_SLOTS];
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// mDefaultWidth holds the default width of allocated buffers. It is used
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// in requestBuffers() if a width and height of zero is specified.
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uint32_t mDefaultWidth;
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// mDefaultHeight holds the default height of allocated buffers. It is used
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// in requestBuffers() if a width and height of zero is specified.
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uint32_t mDefaultHeight;
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// mPixelFormat holds the pixel format of allocated buffers. It is used
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// in requestBuffers() if a format of zero is specified.
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uint32_t mPixelFormat;
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// mBufferCount is the number of buffer slots that the client and server
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// must maintain. It defaults to MIN_BUFFER_SLOTS and can be changed by
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// calling setBufferCount.
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int mBufferCount;
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// mCurrentTexture is the buffer slot index of the buffer that is currently
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// bound to the OpenGL texture. It is initialized to INVALID_BUFFER_SLOT,
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// indicating that no buffer slot is currently bound to the texture. Note,
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// however, that a value of INVALID_BUFFER_SLOT does not necessarily mean
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// that no buffer is bound to the texture. A call to setBufferCount will
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// reset mCurrentTexture to INVALID_BUFFER_SLOT.
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int mCurrentTexture;
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// mCurrentTextureTarget is the GLES texture target to be used with the
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// current texture.
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GLenum mCurrentTextureTarget;
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// mCurrentTextureBuf is the graphic buffer of the current texture. It's
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// possible that this buffer is not associated with any buffer slot, so we
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// must track it separately in order to properly use
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// IGraphicBufferAlloc::freeAllGraphicBuffersExcept.
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sp<GraphicBuffer> mCurrentTextureBuf;
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// mCurrentCrop is the crop rectangle that applies to the current texture.
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// It gets set to mLastQueuedCrop each time updateTexImage is called.
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Rect mCurrentCrop;
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// mCurrentTransform is the transform identifier for the current texture. It
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// gets set to mLastQueuedTransform each time updateTexImage is called.
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uint32_t mCurrentTransform;
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// mCurrentTimestamp is the timestamp for the current texture. It
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// gets set to mLastQueuedTimestamp each time updateTexImage is called.
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int64_t mCurrentTimestamp;
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// mNextCrop is the crop rectangle that will be used for the next buffer
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// that gets queued. It is set by calling setCrop.
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Rect mNextCrop;
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// mNextTransform is the transform identifier that will be used for the next
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// buffer that gets queued. It is set by calling setTransform.
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uint32_t mNextTransform;
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// mTexName is the name of the OpenGL texture to which streamed images will
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// be bound when updateTexImage is called. It is set at construction time
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// changed with a call to setTexName.
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const GLuint mTexName;
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// mGraphicBufferAlloc is the connection to SurfaceFlinger that is used to
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// allocate new GraphicBuffer objects.
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sp<IGraphicBufferAlloc> mGraphicBufferAlloc;
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// mFrameAvailableListener is the listener object that will be called when a
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// new frame becomes available. If it is not NULL it will be called from
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// queueBuffer.
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sp<FrameAvailableListener> mFrameAvailableListener;
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// mSynchronousMode whether we're in synchronous mode or not
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bool mSynchronousMode;
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// mDequeueCondition condition used for dequeueBuffer in synchronous mode
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mutable Condition mDequeueCondition;
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// mQueue is a FIFO of queued buffers used in synchronous mode
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typedef Vector<int> Fifo;
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Fifo mQueue;
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// mMutex is the mutex used to prevent concurrent access to the member
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// variables of SurfaceTexture objects. It must be locked whenever the
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// member variables are accessed.
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mutable Mutex mMutex;
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};
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// ----------------------------------------------------------------------------
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}; // namespace android
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#endif // ANDROID_GUI_SURFACETEXTURE_H
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