1 /* 2 * Copyright (C) 2018 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #pragma once 18 19 #include <EGL/egl.h> 20 #include <EGL/eglext.h> 21 22 #include <gui/BufferQueueDefs.h> 23 24 #include <SkImage.h> 25 #include <cutils/compiler.h> 26 #include <gui/BufferItem.h> 27 #include <system/graphics.h> 28 29 namespace GrAHardwareBufferUtils { 30 typedef void* DeleteImageCtx; 31 typedef void (*DeleteImageProc)(DeleteImageCtx); 32 } 33 34 namespace android { 35 36 namespace uirenderer { 37 class RenderState; 38 } 39 40 class AutoBackendTextureRelease; 41 class SurfaceTexture; 42 43 /* 44 * ImageConsumer implements the parts of SurfaceTexture that deal with 45 * images consumed by HWUI view system. 46 */ 47 class ImageConsumer { 48 public: 49 sk_sp<SkImage> dequeueImage(bool* queueEmpty, SurfaceTexture& cb, 50 uirenderer::RenderState& renderState); 51 52 /** 53 * onAcquireBufferLocked amends the ConsumerBase method to update the 54 * mImageSlots array in addition to the ConsumerBase behavior. 55 */ 56 void onAcquireBufferLocked(BufferItem* item); 57 58 /** 59 * onReleaseBufferLocked amends the ConsumerBase method to update the 60 * mImageSlots array in addition to the ConsumerBase. 61 */ 62 void onReleaseBufferLocked(int slot); 63 64 /** 65 * onFreeBufferLocked frees up the given buffer slot. If the slot has been 66 * initialized this will release the reference to the GraphicBuffer in that 67 * slot and destroy the SkImage in that slot. Otherwise it has no effect. 68 */ 69 void onFreeBufferLocked(int slotIndex); 70 71 private: 72 /** 73 * ImageSlot contains the information and object references that 74 * ImageConsumer maintains about a BufferQueue buffer slot. 75 */ 76 class ImageSlot { 77 public: ImageSlot()78 ImageSlot() : mDataspace(HAL_DATASPACE_UNKNOWN), mEglFence(EGL_NO_SYNC_KHR) {} 79 ~ImageSlot()80 ~ImageSlot() { clear(); } 81 82 void createIfNeeded(sp<GraphicBuffer> graphicBuffer, android_dataspace dataspace, 83 bool forceCreate, GrContext* context); 84 85 void clear(); 86 eglFence()87 inline EGLSyncKHR& eglFence() { return mEglFence; } 88 89 sk_sp<SkImage> getImage(); 90 91 private: 92 // the dataspace associated with the current image 93 android_dataspace mDataspace; 94 95 /** 96 * mEglFence is the EGL sync object that must signal before the buffer 97 * associated with this buffer slot may be dequeued. 98 */ 99 EGLSyncKHR mEglFence; 100 101 /** 102 * mTextureRelease may outlive ImageConsumer, if the last ref is held by an SkImage. 103 * ImageConsumer holds one ref to mTextureRelease, which is decremented by "clear". 104 */ 105 AutoBackendTextureRelease* mTextureRelease = nullptr; 106 }; 107 108 /** 109 * ImageConsumer stores the SkImages that have been allocated by the BufferQueue 110 * for each buffer slot. It is initialized to null pointers, and gets 111 * filled in with the result of BufferQueue::acquire when the 112 * client dequeues a buffer from a 113 * slot that has not yet been used. The buffer allocated to a slot will also 114 * be replaced if the requested buffer usage or geometry differs from that 115 * of the buffer allocated to a slot. 116 */ 117 ImageSlot mImageSlots[BufferQueueDefs::NUM_BUFFER_SLOTS]; 118 }; 119 120 } /* namespace android */ 121