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 #include <system/graphics.h> 37 38 // TODO: Fix Skia. 39 #pragma GCC diagnostic push 40 #pragma GCC diagnostic ignored "-Wunused-parameter" 41 #include <SkImageEncoder.h> 42 #include <SkData.h> 43 #include <SkColorSpace.h> 44 #pragma GCC diagnostic pop 45 46 using namespace android; 47 48 static uint32_t DEFAULT_DISPLAY_ID = ISurfaceComposer::eDisplayIdMain; 49 50 #define COLORSPACE_UNKNOWN 0 51 #define COLORSPACE_SRGB 1 52 #define COLORSPACE_DISPLAY_P3 2 53 54 static void usage(const char* pname) 55 { 56 fprintf(stderr, 57 "usage: %s [-hp] [-d display-id] [FILENAME]\n" 58 " -h: this message\n" 59 " -p: save the file as a png.\n" 60 " -d: specify the display id to capture, default %d.\n" 61 "If FILENAME ends with .png it will be saved as a png.\n" 62 "If FILENAME is not given, the results will be printed to stdout.\n", 63 pname, DEFAULT_DISPLAY_ID 64 ); 65 } 66 67 static SkColorType flinger2skia(PixelFormat f) 68 { 69 switch (f) { 70 case PIXEL_FORMAT_RGB_565: 71 return kRGB_565_SkColorType; 72 default: 73 return kN32_SkColorType; 74 } 75 } 76 77 static sk_sp<SkColorSpace> dataSpaceToColorSpace(android_dataspace d) 78 { 79 switch (d) { 80 case HAL_DATASPACE_V0_SRGB: 81 return SkColorSpace::MakeSRGB(); 82 case HAL_DATASPACE_DISPLAY_P3: 83 return SkColorSpace::MakeRGB( 84 SkColorSpace::kSRGB_RenderTargetGamma, SkColorSpace::kDCIP3_D65_Gamut); 85 default: 86 return nullptr; 87 } 88 } 89 90 static uint32_t dataSpaceToInt(android_dataspace d) 91 { 92 switch (d) { 93 case HAL_DATASPACE_V0_SRGB: 94 return COLORSPACE_SRGB; 95 case HAL_DATASPACE_DISPLAY_P3: 96 return COLORSPACE_DISPLAY_P3; 97 default: 98 return COLORSPACE_UNKNOWN; 99 } 100 } 101 102 static status_t notifyMediaScanner(const char* fileName) { 103 String8 cmd("am broadcast -a android.intent.action.MEDIA_SCANNER_SCAN_FILE -d file://"); 104 String8 fileUrl("\""); 105 fileUrl.append(fileName); 106 fileUrl.append("\""); 107 cmd.append(fileName); 108 cmd.append(" > /dev/null"); 109 int result = system(cmd.string()); 110 if (result < 0) { 111 fprintf(stderr, "Unable to broadcast intent for media scanner.\n"); 112 return UNKNOWN_ERROR; 113 } 114 return NO_ERROR; 115 } 116 117 int main(int argc, char** argv) 118 { 119 const char* pname = argv[0]; 120 bool png = false; 121 int32_t displayId = DEFAULT_DISPLAY_ID; 122 int c; 123 while ((c = getopt(argc, argv, "phd:")) != -1) { 124 switch (c) { 125 case 'p': 126 png = true; 127 break; 128 case 'd': 129 displayId = atoi(optarg); 130 break; 131 case '?': 132 case 'h': 133 usage(pname); 134 return 1; 135 } 136 } 137 argc -= optind; 138 argv += optind; 139 140 int fd = -1; 141 const char* fn = NULL; 142 if (argc == 0) { 143 fd = dup(STDOUT_FILENO); 144 } else if (argc == 1) { 145 fn = argv[0]; 146 fd = open(fn, O_WRONLY | O_CREAT | O_TRUNC, 0664); 147 if (fd == -1) { 148 fprintf(stderr, "Error opening file: %s (%s)\n", fn, strerror(errno)); 149 return 1; 150 } 151 const int len = strlen(fn); 152 if (len >= 4 && 0 == strcmp(fn+len-4, ".png")) { 153 png = true; 154 } 155 } 156 157 if (fd == -1) { 158 usage(pname); 159 return 1; 160 } 161 162 void const* mapbase = MAP_FAILED; 163 ssize_t mapsize = -1; 164 165 void const* base = NULL; 166 uint32_t w, s, h, f; 167 android_dataspace d; 168 size_t size = 0; 169 170 // Maps orientations from DisplayInfo to ISurfaceComposer 171 static const uint32_t ORIENTATION_MAP[] = { 172 ISurfaceComposer::eRotateNone, // 0 == DISPLAY_ORIENTATION_0 173 ISurfaceComposer::eRotate270, // 1 == DISPLAY_ORIENTATION_90 174 ISurfaceComposer::eRotate180, // 2 == DISPLAY_ORIENTATION_180 175 ISurfaceComposer::eRotate90, // 3 == DISPLAY_ORIENTATION_270 176 }; 177 178 // setThreadPoolMaxThreadCount(0) actually tells the kernel it's 179 // not allowed to spawn any additional threads, but we still spawn 180 // a binder thread from userspace when we call startThreadPool(). 181 // See b/36066697 for rationale 182 ProcessState::self()->setThreadPoolMaxThreadCount(0); 183 ProcessState::self()->startThreadPool(); 184 185 ScreenshotClient screenshot; 186 sp<IBinder> display = SurfaceComposerClient::getBuiltInDisplay(displayId); 187 if (display == NULL) { 188 fprintf(stderr, "Unable to get handle for display %d\n", displayId); 189 // b/36066697: Avoid running static destructors. 190 _exit(1); 191 } 192 193 Vector<DisplayInfo> configs; 194 SurfaceComposerClient::getDisplayConfigs(display, &configs); 195 int activeConfig = SurfaceComposerClient::getActiveConfig(display); 196 if (static_cast<size_t>(activeConfig) >= configs.size()) { 197 fprintf(stderr, "Active config %d not inside configs (size %zu)\n", 198 activeConfig, configs.size()); 199 // b/36066697: Avoid running static destructors. 200 _exit(1); 201 } 202 uint8_t displayOrientation = configs[activeConfig].orientation; 203 uint32_t captureOrientation = ORIENTATION_MAP[displayOrientation]; 204 205 status_t result = screenshot.update(display, Rect(), 206 0 /* reqWidth */, 0 /* reqHeight */, 207 INT32_MIN, INT32_MAX, /* all layers */ 208 false, captureOrientation); 209 if (result == NO_ERROR) { 210 base = screenshot.getPixels(); 211 w = screenshot.getWidth(); 212 h = screenshot.getHeight(); 213 s = screenshot.getStride(); 214 f = screenshot.getFormat(); 215 d = screenshot.getDataSpace(); 216 size = screenshot.getSize(); 217 } 218 219 if (base != NULL) { 220 if (png) { 221 const SkImageInfo info = 222 SkImageInfo::Make(w, h, flinger2skia(f), kPremul_SkAlphaType, 223 dataSpaceToColorSpace(d)); 224 SkPixmap pixmap(info, base, s * bytesPerPixel(f)); 225 struct FDWStream final : public SkWStream { 226 size_t fBytesWritten = 0; 227 int fFd; 228 FDWStream(int f) : fFd(f) {} 229 size_t bytesWritten() const override { return fBytesWritten; } 230 bool write(const void* buffer, size_t size) override { 231 fBytesWritten += size; 232 return size == 0 || ::write(fFd, buffer, size) > 0; 233 } 234 } fdStream(fd); 235 (void)SkEncodeImage(&fdStream, pixmap, SkEncodedImageFormat::kPNG, 100); 236 if (fn != NULL) { 237 notifyMediaScanner(fn); 238 } 239 } else { 240 uint32_t c = dataSpaceToInt(d); 241 write(fd, &w, 4); 242 write(fd, &h, 4); 243 write(fd, &f, 4); 244 write(fd, &c, 4); 245 size_t Bpp = bytesPerPixel(f); 246 for (size_t y=0 ; y<h ; y++) { 247 write(fd, base, w*Bpp); 248 base = (void *)((char *)base + s*Bpp); 249 } 250 } 251 } 252 close(fd); 253 if (mapbase != MAP_FAILED) { 254 munmap((void *)mapbase, mapsize); 255 } 256 257 // b/36066697: Avoid running static destructors. 258 _exit(0); 259 } 260
