1/* 2 * Copyright (C) 2010 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#include <errno.h> 18#include <unistd.h> 19#include <stdio.h> 20#include <fcntl.h> 21#include <stdlib.h> 22#include <string.h> 23 24#include <linux/fb.h> 25#include <sys/ioctl.h> 26#include <sys/mman.h> 27 28#include <binder/ProcessState.h> 29 30#include <gui/SurfaceComposerClient.h> 31#include <gui/ISurfaceComposer.h> 32 33#include <ui/DisplayInfo.h> 34#include <ui/PixelFormat.h> 35 36// TODO: Fix Skia. 37#pragma GCC diagnostic push 38#pragma GCC diagnostic ignored "-Wunused-parameter" 39#include <SkImageEncoder.h> 40#include <SkData.h> 41#pragma GCC diagnostic pop 42 43using namespace android; 44 45static uint32_t DEFAULT_DISPLAY_ID = ISurfaceComposer::eDisplayIdMain; 46 47static void usage(const char* pname) 48{ 49 fprintf(stderr, 50 "usage: %s [-hp] [-d display-id] [FILENAME]\n" 51 " -h: this message\n" 52 " -p: save the file as a png.\n" 53 " -d: specify the display id to capture, default %d.\n" 54 "If FILENAME ends with .png it will be saved as a png.\n" 55 "If FILENAME is not given, the results will be printed to stdout.\n", 56 pname, DEFAULT_DISPLAY_ID 57 ); 58} 59 60static SkColorType flinger2skia(PixelFormat f) 61{ 62 switch (f) { 63 case PIXEL_FORMAT_RGB_565: 64 return kRGB_565_SkColorType; 65 default: 66 return kN32_SkColorType; 67 } 68} 69 70static status_t notifyMediaScanner(const char* fileName) { 71 String8 cmd("am broadcast -a android.intent.action.MEDIA_SCANNER_SCAN_FILE -d file://"); 72 String8 fileUrl("\""); 73 fileUrl.append(fileName); 74 fileUrl.append("\""); 75 cmd.append(fileName); 76 cmd.append(" > /dev/null"); 77 int result = system(cmd.string()); 78 if (result < 0) { 79 fprintf(stderr, "Unable to broadcast intent for media scanner.\n"); 80 return UNKNOWN_ERROR; 81 } 82 return NO_ERROR; 83} 84 85int main(int argc, char** argv) 86{ 87 // setThreadPoolMaxThreadCount(0) actually tells the kernel it's 88 // not allowed to spawn any additional threads, but we still spawn 89 // a binder thread from userspace when we call startThreadPool(). 90 // See b/36066697 for rationale 91 ProcessState::self()->setThreadPoolMaxThreadCount(0); 92 ProcessState::self()->startThreadPool(); 93 94 const char* pname = argv[0]; 95 bool png = false; 96 int32_t displayId = DEFAULT_DISPLAY_ID; 97 int c; 98 while ((c = getopt(argc, argv, "phd:")) != -1) { 99 switch (c) { 100 case 'p': 101 png = true; 102 break; 103 case 'd': 104 displayId = atoi(optarg); 105 break; 106 case '?': 107 case 'h': 108 usage(pname); 109 return 1; 110 } 111 } 112 argc -= optind; 113 argv += optind; 114 115 int fd = -1; 116 const char* fn = NULL; 117 if (argc == 0) { 118 fd = dup(STDOUT_FILENO); 119 } else if (argc == 1) { 120 fn = argv[0]; 121 fd = open(fn, O_WRONLY | O_CREAT | O_TRUNC, 0664); 122 if (fd == -1) { 123 fprintf(stderr, "Error opening file: %s (%s)\n", fn, strerror(errno)); 124 return 1; 125 } 126 const int len = strlen(fn); 127 if (len >= 4 && 0 == strcmp(fn+len-4, ".png")) { 128 png = true; 129 } 130 } 131 132 if (fd == -1) { 133 usage(pname); 134 return 1; 135 } 136 137 void const* mapbase = MAP_FAILED; 138 ssize_t mapsize = -1; 139 140 void const* base = NULL; 141 uint32_t w, s, h, f; 142 size_t size = 0; 143 144 // Maps orientations from DisplayInfo to ISurfaceComposer 145 static const uint32_t ORIENTATION_MAP[] = { 146 ISurfaceComposer::eRotateNone, // 0 == DISPLAY_ORIENTATION_0 147 ISurfaceComposer::eRotate270, // 1 == DISPLAY_ORIENTATION_90 148 ISurfaceComposer::eRotate180, // 2 == DISPLAY_ORIENTATION_180 149 ISurfaceComposer::eRotate90, // 3 == DISPLAY_ORIENTATION_270 150 }; 151 152 ScreenshotClient screenshot; 153 sp<IBinder> display = SurfaceComposerClient::getBuiltInDisplay(displayId); 154 if (display == NULL) { 155 fprintf(stderr, "Unable to get handle for display %d\n", displayId); 156 return 1; 157 } 158 159 Vector<DisplayInfo> configs; 160 SurfaceComposerClient::getDisplayConfigs(display, &configs); 161 int activeConfig = SurfaceComposerClient::getActiveConfig(display); 162 if (static_cast<size_t>(activeConfig) >= configs.size()) { 163 fprintf(stderr, "Active config %d not inside configs (size %zu)\n", 164 activeConfig, configs.size()); 165 return 1; 166 } 167 uint8_t displayOrientation = configs[activeConfig].orientation; 168 uint32_t captureOrientation = ORIENTATION_MAP[displayOrientation]; 169 170 status_t result = screenshot.update(display, Rect(), 171 0 /* reqWidth */, 0 /* reqHeight */, 172 INT32_MIN, INT32_MAX, /* all layers */ 173 false, captureOrientation); 174 if (result == NO_ERROR) { 175 base = screenshot.getPixels(); 176 w = screenshot.getWidth(); 177 h = screenshot.getHeight(); 178 s = screenshot.getStride(); 179 f = screenshot.getFormat(); 180 size = screenshot.getSize(); 181 } 182 183 if (base != NULL) { 184 if (png) { 185 const SkImageInfo info = 186 SkImageInfo::Make(w, h, flinger2skia(f), kPremul_SkAlphaType); 187 SkPixmap pixmap(info, base, s * bytesPerPixel(f)); 188 struct FDWStream final : public SkWStream { 189 size_t fBytesWritten = 0; 190 int fFd; 191 FDWStream(int f) : fFd(f) {} 192 size_t bytesWritten() const override { return fBytesWritten; } 193 bool write(const void* buffer, size_t size) override { 194 fBytesWritten += size; 195 return size == 0 || ::write(fFd, buffer, size) > 0; 196 } 197 } fdStream(fd); 198 (void)SkEncodeImage(&fdStream, pixmap, SkEncodedImageFormat::kPNG, 100); 199 if (fn != NULL) { 200 notifyMediaScanner(fn); 201 } 202 } else { 203 write(fd, &w, 4); 204 write(fd, &h, 4); 205 write(fd, &f, 4); 206 size_t Bpp = bytesPerPixel(f); 207 for (size_t y=0 ; y<h ; y++) { 208 write(fd, base, w*Bpp); 209 base = (void *)((char *)base + s*Bpp); 210 } 211 } 212 } 213 close(fd); 214 if (mapbase != MAP_FAILED) { 215 munmap((void *)mapbase, mapsize); 216 } 217 218 // b/36066697: Avoid running static destructors. 219 _exit(0); 220} 221