FramebufferNativeWindow.cpp revision 58a79f47457e9cae2f6880653b581fe3170b0b1f
1/* 2** 3** Copyright 2007 The Android Open Source Project 4** 5** Licensed under the Apache License Version 2.0(the "License"); 6** you may not use this file except in compliance with the License. 7** You may obtain a copy of the License at 8** 9** http://www.apache.org/licenses/LICENSE-2.0 10** 11** Unless required by applicable law or agreed to in writing software 12** distributed under the License is distributed on an "AS IS" BASIS 13** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND either express or implied. 14** See the License for the specific language governing permissions and 15** limitations under the License. 16*/ 17 18#define LOG_TAG "FramebufferNativeWindow" 19 20#include <stdlib.h> 21#include <stdio.h> 22#include <string.h> 23#include <errno.h> 24 25#include <cutils/log.h> 26#include <cutils/atomic.h> 27#include <utils/threads.h> 28 29#include <ui/SurfaceComposerClient.h> 30#include <ui/Rect.h> 31#include <ui/FramebufferNativeWindow.h> 32 33#include <EGL/egl.h> 34 35#include <pixelflinger/format.h> 36#include <pixelflinger/pixelflinger.h> 37 38#include <hardware/hardware.h> 39#include <hardware/gralloc.h> 40 41#include <private/ui/android_natives_priv.h> 42 43// ---------------------------------------------------------------------------- 44namespace android { 45// ---------------------------------------------------------------------------- 46 47class NativeBuffer 48 : public EGLNativeBase< 49 android_native_buffer_t, 50 NativeBuffer, 51 LightRefBase<NativeBuffer> > 52{ 53public: 54 NativeBuffer(int w, int h, int f, int u) : BASE() { 55 android_native_buffer_t::width = w; 56 android_native_buffer_t::height = h; 57 android_native_buffer_t::format = f; 58 android_native_buffer_t::usage = u; 59 } 60private: 61 friend class LightRefBase<NativeBuffer>; 62 ~NativeBuffer() { }; // this class cannot be overloaded 63}; 64 65 66/* 67 * This implements the (main) framebuffer management. This class is used 68 * mostly by SurfaceFlinger, but also by command line GL application. 69 * 70 * In fact this is an implementation of android_native_window_t on top of 71 * the framebuffer. 72 * 73 * Currently it is pretty simple, it manages only two buffers (the front and 74 * back buffer). 75 * 76 */ 77 78FramebufferNativeWindow::FramebufferNativeWindow() 79 : BASE(), fbDev(0), grDev(0) 80{ 81 hw_module_t const* module; 82 if (hw_get_module(GRALLOC_HARDWARE_MODULE_ID, &module) == 0) { 83 int stride; 84 framebuffer_open(module, &fbDev); 85 gralloc_open(module, &grDev); 86 int err; 87 88 89 // initialize the buffer FIFO 90 mNumBuffers = 2; 91 mNumFreeBuffers = 2; 92 mBufferHead = mNumBuffers-1; 93 buffers[0] = new NativeBuffer( 94 fbDev->width, fbDev->height, fbDev->format, GRALLOC_USAGE_HW_FB); 95 buffers[1] = new NativeBuffer( 96 fbDev->width, fbDev->height, fbDev->format, GRALLOC_USAGE_HW_FB); 97 98 err = grDev->alloc(grDev, 99 fbDev->width, fbDev->height, fbDev->format, 100 GRALLOC_USAGE_HW_FB, &buffers[0]->handle, &buffers[0]->stride); 101 102 LOGE_IF(err, "fb buffer 0 allocation failed w=%d, h=%d, err=%s", 103 fbDev->width, fbDev->height, strerror(-err)); 104 105 err = grDev->alloc(grDev, 106 fbDev->width, fbDev->height, fbDev->format, 107 GRALLOC_USAGE_HW_FB, &buffers[1]->handle, &buffers[1]->stride); 108 109 LOGE_IF(err, "fb buffer 1 allocation failed w=%d, h=%d, err=%s", 110 fbDev->width, fbDev->height, strerror(-err)); 111 } 112 113 uint32_t flags = fbDev->flags & SURFACE_FLAG_MAPPED; 114 115 /* 116 * FIXME: SURFACE_FLAG_PRESERVE_CONTENT 117 * how to implement this, there is no concept of preserve content in 118 * the framebuffer, which just "posts" buffer. 119 * 120 * It looks like what we need is a way to know if the posted buffer can 121 * be reused. But if so, why allocating 2 buffers?... 122 * 123 * should the lock/unlock calls take care of the copy-back? 124 * 125 * 126 * In the end, the client wants to know if the backbuffer is preserved 127 * though... it's complicated. 128 * 129 */ 130 131 //flags |= SURFACE_FLAG_PRESERVE_CONTENT; 132 133 134 const_cast<uint32_t&>(android_native_window_t::flags) = flags; 135 const_cast<float&>(android_native_window_t::xdpi) = fbDev->xdpi; 136 const_cast<float&>(android_native_window_t::ydpi) = fbDev->ydpi; 137 const_cast<int&>(android_native_window_t::minSwapInterval) = 138 fbDev->minSwapInterval; 139 const_cast<int&>(android_native_window_t::maxSwapInterval) = 140 fbDev->maxSwapInterval; 141 142 android_native_window_t::setSwapInterval = setSwapInterval; 143 android_native_window_t::dequeueBuffer = dequeueBuffer; 144 android_native_window_t::lockBuffer = lockBuffer; 145 android_native_window_t::queueBuffer = queueBuffer; 146} 147 148FramebufferNativeWindow::~FramebufferNativeWindow() { 149 grDev->free(grDev, buffers[0]->handle); 150 grDev->free(grDev, buffers[1]->handle); 151 gralloc_close(grDev); 152 framebuffer_close(fbDev); 153} 154 155int FramebufferNativeWindow::setSwapInterval( 156 android_native_window_t* window, int interval) 157{ 158 framebuffer_device_t* fb = getSelf(window)->fbDev; 159 return fb->setSwapInterval(fb, interval); 160} 161 162int FramebufferNativeWindow::dequeueBuffer(android_native_window_t* window, 163 android_native_buffer_t** buffer) 164{ 165 FramebufferNativeWindow* self = getSelf(window); 166 Mutex::Autolock _l(self->mutex); 167 framebuffer_device_t* fb = self->fbDev; 168 169 // wait for a free buffer 170 while (!self->mNumFreeBuffers) { 171 self->mCondition.wait(self->mutex); 172 } 173 // get this buffer 174 self->mNumFreeBuffers--; 175 int index = self->mBufferHead++; 176 if (self->mBufferHead >= self->mNumBuffers) 177 self->mBufferHead = 0; 178 179 *buffer = self->buffers[index].get(); 180 181 return 0; 182} 183 184int FramebufferNativeWindow::lockBuffer(android_native_window_t* window, 185 android_native_buffer_t* buffer) 186{ 187 FramebufferNativeWindow* self = getSelf(window); 188 Mutex::Autolock _l(self->mutex); 189 190 // wait that the buffer we're locking is not front anymore 191 while (self->front == buffer) { 192 self->mCondition.wait(self->mutex); 193 } 194 195 return NO_ERROR; 196} 197 198int FramebufferNativeWindow::queueBuffer(android_native_window_t* window, 199 android_native_buffer_t* buffer) 200{ 201 FramebufferNativeWindow* self = getSelf(window); 202 Mutex::Autolock _l(self->mutex); 203 framebuffer_device_t* fb = self->fbDev; 204 buffer_handle_t handle = static_cast<NativeBuffer*>(buffer)->handle; 205 int res = fb->post(fb, handle); 206 self->front = static_cast<NativeBuffer*>(buffer); 207 self->mNumFreeBuffers++; 208 self->mCondition.broadcast(); 209 return res; 210} 211 212// ---------------------------------------------------------------------------- 213}; // namespace android 214// ---------------------------------------------------------------------------- 215 216 217EGLNativeWindowType android_createDisplaySurface(void) 218{ 219 return new android::FramebufferNativeWindow(); 220} 221 222