424 lines
14 KiB
C++
424 lines
14 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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#define LOG_TAG "SurfaceTexture"
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//#define LOG_NDEBUG 0
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#define GL_GLEXT_PROTOTYPES
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#define EGL_EGLEXT_PROTOTYPES
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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 <GLES2/gl2ext.h>
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#include <gui/SurfaceTexture.h>
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#include <surfaceflinger/ISurfaceComposer.h>
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#include <surfaceflinger/SurfaceComposerClient.h>
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#include <surfaceflinger/IGraphicBufferAlloc.h>
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#include <utils/Log.h>
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namespace android {
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// Transform matrices
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static float mtxIdentity[16] = {
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1, 0, 0, 0,
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0, 1, 0, 0,
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0, 0, 1, 0,
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0, 0, 0, 1,
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};
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static float mtxFlipH[16] = {
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-1, 0, 0, 0,
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0, 1, 0, 0,
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0, 0, 1, 0,
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1, 0, 0, 1,
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};
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static float mtxFlipV[16] = {
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1, 0, 0, 0,
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0, -1, 0, 0,
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0, 0, 1, 0,
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0, 1, 0, 1,
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};
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static float mtxRot90[16] = {
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0, 1, 0, 0,
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-1, 0, 0, 0,
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0, 0, 1, 0,
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1, 0, 0, 1,
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};
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static float mtxRot180[16] = {
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-1, 0, 0, 0,
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0, -1, 0, 0,
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0, 0, 1, 0,
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1, 1, 0, 1,
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};
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static float mtxRot270[16] = {
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0, -1, 0, 0,
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1, 0, 0, 0,
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0, 0, 1, 0,
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0, 1, 0, 1,
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};
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static void mtxMul(float out[16], const float a[16], const float b[16]);
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SurfaceTexture::SurfaceTexture(GLuint tex, bool allowSynchronousMode) :
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mBufferCount(MIN_BUFFER_SLOTS), mCurrentTexture(INVALID_BUFFER_SLOT),
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mCurrentTransform(0), mLastQueued(INVALID_BUFFER_SLOT),
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mLastQueuedTransform(0), mNextTransform(0), mTexName(tex) {
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LOGV("SurfaceTexture::SurfaceTexture");
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for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
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mSlots[i].mEglImage = EGL_NO_IMAGE_KHR;
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mSlots[i].mEglDisplay = EGL_NO_DISPLAY;
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mSlots[i].mOwnedByClient = false;
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}
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sp<ISurfaceComposer> composer(ComposerService::getComposerService());
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mGraphicBufferAlloc = composer->createGraphicBufferAlloc();
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}
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SurfaceTexture::~SurfaceTexture() {
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LOGV("SurfaceTexture::~SurfaceTexture");
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freeAllBuffers();
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}
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status_t SurfaceTexture::setBufferCount(int bufferCount) {
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LOGV("SurfaceTexture::setBufferCount");
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if (bufferCount < MIN_BUFFER_SLOTS) {
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return BAD_VALUE;
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}
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Mutex::Autolock lock(mMutex);
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freeAllBuffers();
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mBufferCount = bufferCount;
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mCurrentTexture = INVALID_BUFFER_SLOT;
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mLastQueued = INVALID_BUFFER_SLOT;
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return OK;
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}
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sp<GraphicBuffer> SurfaceTexture::requestBuffer(int buf,
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uint32_t w, uint32_t h, uint32_t format, uint32_t usage) {
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LOGV("SurfaceTexture::requestBuffer");
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Mutex::Autolock lock(mMutex);
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if (buf < 0 || mBufferCount <= buf) {
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LOGE("requestBuffer: slot index out of range [0, %d]: %d",
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mBufferCount, buf);
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return 0;
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}
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usage |= GraphicBuffer::USAGE_HW_TEXTURE;
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sp<GraphicBuffer> graphicBuffer(
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mGraphicBufferAlloc->createGraphicBuffer(w, h, format, usage));
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if (graphicBuffer == 0) {
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LOGE("requestBuffer: SurfaceComposer::createGraphicBuffer failed");
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} else {
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mSlots[buf].mGraphicBuffer = graphicBuffer;
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if (mSlots[buf].mEglImage != EGL_NO_IMAGE_KHR) {
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eglDestroyImageKHR(mSlots[buf].mEglDisplay, mSlots[buf].mEglImage);
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mSlots[buf].mEglImage = EGL_NO_IMAGE_KHR;
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mSlots[buf].mEglDisplay = EGL_NO_DISPLAY;
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}
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mAllocdBuffers.add(graphicBuffer);
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}
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return graphicBuffer;
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}
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status_t SurfaceTexture::dequeueBuffer(int *buf) {
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LOGV("SurfaceTexture::dequeueBuffer");
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Mutex::Autolock lock(mMutex);
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int found = INVALID_BUFFER_SLOT;
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for (int i = 0; i < mBufferCount; i++) {
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if (!mSlots[i].mOwnedByClient && i != mCurrentTexture && i != mLastQueued) {
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mSlots[i].mOwnedByClient = true;
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found = i;
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break;
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}
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}
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if (found == INVALID_BUFFER_SLOT) {
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return -EBUSY;
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}
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*buf = found;
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return OK;
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}
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status_t SurfaceTexture::queueBuffer(int buf) {
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LOGV("SurfaceTexture::queueBuffer");
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Mutex::Autolock lock(mMutex);
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if (buf < 0 || mBufferCount <= buf) {
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LOGE("queueBuffer: slot index out of range [0, %d]: %d",
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mBufferCount, buf);
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return -EINVAL;
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} else if (!mSlots[buf].mOwnedByClient) {
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LOGE("queueBuffer: slot %d is not owned by the client", buf);
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return -EINVAL;
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} else if (mSlots[buf].mGraphicBuffer == 0) {
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LOGE("queueBuffer: slot %d was enqueued without requesting a buffer",
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buf);
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return -EINVAL;
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}
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mSlots[buf].mOwnedByClient = false;
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mLastQueued = buf;
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mLastQueuedCrop = mNextCrop;
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mLastQueuedTransform = mNextTransform;
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if (mFrameAvailableListener != 0) {
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mFrameAvailableListener->onFrameAvailable();
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}
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return OK;
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}
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void SurfaceTexture::cancelBuffer(int buf) {
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LOGV("SurfaceTexture::cancelBuffer");
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Mutex::Autolock lock(mMutex);
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if (buf < 0 || mBufferCount <= buf) {
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LOGE("cancelBuffer: slot index out of range [0, %d]: %d", mBufferCount,
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buf);
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return;
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} else if (!mSlots[buf].mOwnedByClient) {
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LOGE("cancelBuffer: slot %d is not owned by the client", buf);
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return;
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}
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mSlots[buf].mOwnedByClient = false;
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}
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status_t SurfaceTexture::setCrop(const Rect& crop) {
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LOGV("SurfaceTexture::setCrop");
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Mutex::Autolock lock(mMutex);
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mNextCrop = crop;
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return OK;
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}
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status_t SurfaceTexture::setTransform(uint32_t transform) {
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LOGV("SurfaceTexture::setTransform");
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Mutex::Autolock lock(mMutex);
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mNextTransform = transform;
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return OK;
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}
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status_t SurfaceTexture::updateTexImage() {
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LOGV("SurfaceTexture::updateTexImage");
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Mutex::Autolock lock(mMutex);
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// We always bind the texture even if we don't update its contents.
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glBindTexture(GL_TEXTURE_EXTERNAL_OES, mTexName);
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// Initially both mCurrentTexture and mLastQueued are INVALID_BUFFER_SLOT,
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// so this check will fail until a buffer gets queued.
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if (mCurrentTexture != mLastQueued) {
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// Update the GL texture object.
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EGLImageKHR image = mSlots[mLastQueued].mEglImage;
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if (image == EGL_NO_IMAGE_KHR) {
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EGLDisplay dpy = eglGetCurrentDisplay();
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sp<GraphicBuffer> graphicBuffer = mSlots[mLastQueued].mGraphicBuffer;
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image = createImage(dpy, graphicBuffer);
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mSlots[mLastQueued].mEglImage = image;
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mSlots[mLastQueued].mEglDisplay = dpy;
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}
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GLint error;
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while ((error = glGetError()) != GL_NO_ERROR) {
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LOGE("GL error cleared before updating SurfaceTexture: %#04x", error);
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}
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glEGLImageTargetTexture2DOES(GL_TEXTURE_EXTERNAL_OES, (GLeglImageOES)image);
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bool failed = false;
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while ((error = glGetError()) != GL_NO_ERROR) {
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LOGE("error binding external texture image %p (slot %d): %#04x",
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image, mLastQueued, error);
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failed = true;
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}
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if (failed) {
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return -EINVAL;
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}
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// Update the SurfaceTexture state.
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mCurrentTexture = mLastQueued;
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mCurrentTextureBuf = mSlots[mCurrentTexture].mGraphicBuffer;
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mCurrentCrop = mLastQueuedCrop;
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mCurrentTransform = mLastQueuedTransform;
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}
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return OK;
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}
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void SurfaceTexture::getTransformMatrix(float mtx[16]) {
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LOGV("SurfaceTexture::updateTexImage");
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Mutex::Autolock lock(mMutex);
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float xform[16];
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for (int i = 0; i < 16; i++) {
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xform[i] = mtxIdentity[i];
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}
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if (mCurrentTransform & NATIVE_WINDOW_TRANSFORM_FLIP_H) {
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float result[16];
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mtxMul(result, xform, mtxFlipH);
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for (int i = 0; i < 16; i++) {
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xform[i] = result[i];
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}
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}
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if (mCurrentTransform & NATIVE_WINDOW_TRANSFORM_FLIP_V) {
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float result[16];
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mtxMul(result, xform, mtxFlipV);
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for (int i = 0; i < 16; i++) {
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xform[i] = result[i];
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}
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}
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if (mCurrentTransform & NATIVE_WINDOW_TRANSFORM_ROT_90) {
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float result[16];
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mtxMul(result, xform, mtxRot90);
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for (int i = 0; i < 16; i++) {
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xform[i] = result[i];
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}
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}
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sp<GraphicBuffer>& buf(mSlots[mCurrentTexture].mGraphicBuffer);
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float tx, ty, sx, sy;
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if (!mCurrentCrop.isEmpty()) {
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// In order to prevent bilinear sampling at the of the crop rectangle we
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// may need to shrink it by 2 texels in each direction. Normally this
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// would just need to take 1/2 a texel off each end, but because the
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// chroma channels will likely be subsampled we need to chop off a whole
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// texel. This will cause artifacts if someone does nearest sampling
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// with 1:1 pixel:texel ratio, but it's impossible to simultaneously
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// accomodate the bilinear and nearest sampling uses.
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//
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// If nearest sampling turns out to be a desirable usage of these
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// textures then we could add the ability to switch a SurfaceTexture to
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// nearest-mode. Preferably, however, the image producers (video
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// decoder, camera, etc.) would simply not use a crop rectangle (or at
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// least not tell the framework about it) so that the GPU can do the
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// correct edge behavior.
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int xshrink = 0, yshrink = 0;
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if (mCurrentCrop.left > 0) {
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tx = float(mCurrentCrop.left + 1) / float(buf->getWidth());
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xshrink++;
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} else {
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tx = 0.0f;
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}
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if (mCurrentCrop.right < buf->getWidth()) {
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xshrink++;
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}
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if (mCurrentCrop.bottom < buf->getHeight()) {
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ty = (float(buf->getHeight() - mCurrentCrop.bottom) + 1.0f) /
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float(buf->getHeight());
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yshrink++;
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} else {
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ty = 0.0f;
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}
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if (mCurrentCrop.top > 0) {
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yshrink++;
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}
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sx = float(mCurrentCrop.width() - xshrink) / float(buf->getWidth());
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sy = float(mCurrentCrop.height() - yshrink) / float(buf->getHeight());
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} else {
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tx = 0.0f;
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ty = 0.0f;
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sx = 1.0f;
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sy = 1.0f;
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}
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float crop[16] = {
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sx, 0, 0, 0,
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0, sy, 0, 0,
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0, 0, 1, 0,
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tx, ty, 0, 1,
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};
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float mtxBeforeFlipV[16];
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mtxMul(mtxBeforeFlipV, crop, xform);
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// SurfaceFlinger expects the top of its window textures to be at a Y
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// coordinate of 0, so SurfaceTexture must behave the same way. We don't
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// want to expose this to applications, however, so we must add an
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// additional vertical flip to the transform after all the other transforms.
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mtxMul(mtx, mtxFlipV, mtxBeforeFlipV);
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}
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void SurfaceTexture::setFrameAvailableListener(
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const sp<FrameAvailableListener>& l) {
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LOGV("SurfaceTexture::setFrameAvailableListener");
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Mutex::Autolock lock(mMutex);
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mFrameAvailableListener = l;
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}
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sp<IBinder> SurfaceTexture::getAllocator() {
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LOGV("SurfaceTexture::getAllocator");
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return mGraphicBufferAlloc->asBinder();
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}
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void SurfaceTexture::freeAllBuffers() {
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for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
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mSlots[i].mGraphicBuffer = 0;
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mSlots[i].mOwnedByClient = false;
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if (mSlots[i].mEglImage != EGL_NO_IMAGE_KHR) {
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eglDestroyImageKHR(mSlots[i].mEglDisplay, mSlots[i].mEglImage);
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mSlots[i].mEglImage = EGL_NO_IMAGE_KHR;
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mSlots[i].mEglDisplay = EGL_NO_DISPLAY;
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}
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}
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int exceptBuf = -1;
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for (size_t i = 0; i < mAllocdBuffers.size(); i++) {
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if (mAllocdBuffers[i] == mCurrentTextureBuf) {
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exceptBuf = i;
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break;
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}
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}
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mAllocdBuffers.clear();
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if (exceptBuf >= 0) {
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mAllocdBuffers.add(mCurrentTextureBuf);
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}
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mGraphicBufferAlloc->freeAllGraphicBuffersExcept(exceptBuf);
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}
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EGLImageKHR SurfaceTexture::createImage(EGLDisplay dpy,
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const sp<GraphicBuffer>& graphicBuffer) {
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EGLClientBuffer cbuf = (EGLClientBuffer)graphicBuffer->getNativeBuffer();
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EGLint attrs[] = {
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EGL_IMAGE_PRESERVED_KHR, EGL_TRUE,
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EGL_NONE,
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};
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EGLImageKHR image = eglCreateImageKHR(dpy, EGL_NO_CONTEXT,
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EGL_NATIVE_BUFFER_ANDROID, cbuf, attrs);
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EGLint error = eglGetError();
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if (error != EGL_SUCCESS) {
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LOGE("error creating EGLImage: %#x", error);
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} else if (image == EGL_NO_IMAGE_KHR) {
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LOGE("no error reported, but no image was returned by "
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"eglCreateImageKHR");
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}
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return image;
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}
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static void mtxMul(float out[16], const float a[16], const float b[16]) {
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out[0] = a[0]*b[0] + a[4]*b[1] + a[8]*b[2] + a[12]*b[3];
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out[1] = a[1]*b[0] + a[5]*b[1] + a[9]*b[2] + a[13]*b[3];
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out[2] = a[2]*b[0] + a[6]*b[1] + a[10]*b[2] + a[14]*b[3];
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out[3] = a[3]*b[0] + a[7]*b[1] + a[11]*b[2] + a[15]*b[3];
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out[4] = a[0]*b[4] + a[4]*b[5] + a[8]*b[6] + a[12]*b[7];
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out[5] = a[1]*b[4] + a[5]*b[5] + a[9]*b[6] + a[13]*b[7];
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out[6] = a[2]*b[4] + a[6]*b[5] + a[10]*b[6] + a[14]*b[7];
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out[7] = a[3]*b[4] + a[7]*b[5] + a[11]*b[6] + a[15]*b[7];
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out[8] = a[0]*b[8] + a[4]*b[9] + a[8]*b[10] + a[12]*b[11];
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out[9] = a[1]*b[8] + a[5]*b[9] + a[9]*b[10] + a[13]*b[11];
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out[10] = a[2]*b[8] + a[6]*b[9] + a[10]*b[10] + a[14]*b[11];
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out[11] = a[3]*b[8] + a[7]*b[9] + a[11]*b[10] + a[15]*b[11];
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out[12] = a[0]*b[12] + a[4]*b[13] + a[8]*b[14] + a[12]*b[15];
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out[13] = a[1]*b[12] + a[5]*b[13] + a[9]*b[14] + a[13]*b[15];
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out[14] = a[2]*b[12] + a[6]*b[13] + a[10]*b[14] + a[14]*b[15];
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out[15] = a[3]*b[12] + a[7]*b[13] + a[11]*b[14] + a[15]*b[15];
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}
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}; // namespace android
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