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 46using namespace android; 47 48static 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 54static 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 67static 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 77static 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 90static 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 102static status_t notifyMediaScanner(const char* fileName) { 103 String8 cmd("am broadcast -a android.intent.action.MEDIA_SCANNER_SCAN_FILE -d file://"); 104 cmd.append(fileName); 105 cmd.append(" > /dev/null"); 106 int result = system(cmd.string()); 107 if (result < 0) { 108 fprintf(stderr, "Unable to broadcast intent for media scanner.\n"); 109 return UNKNOWN_ERROR; 110 } 111 return NO_ERROR; 112} 113 114int main(int argc, char** argv) 115{ 116 const char* pname = argv[0]; 117 bool png = false; 118 int32_t displayId = DEFAULT_DISPLAY_ID; 119 int c; 120 while ((c = getopt(argc, argv, "phd:")) != -1) { 121 switch (c) { 122 case 'p': 123 png = true; 124 break; 125 case 'd': 126 displayId = atoi(optarg); 127 break; 128 case '?': 129 case 'h': 130 usage(pname); 131 return 1; 132 } 133 } 134 argc -= optind; 135 argv += optind; 136 137 int fd = -1; 138 const char* fn = NULL; 139 if (argc == 0) { 140 fd = dup(STDOUT_FILENO); 141 } else if (argc == 1) { 142 fn = argv[0]; 143 fd = open(fn, O_WRONLY | O_CREAT | O_TRUNC, 0664); 144 if (fd == -1) { 145 fprintf(stderr, "Error opening file: %s (%s)\n", fn, strerror(errno)); 146 return 1; 147 } 148 const int len = strlen(fn); 149 if (len >= 4 && 0 == strcmp(fn+len-4, ".png")) { 150 png = true; 151 } 152 } 153 154 if (fd == -1) { 155 usage(pname); 156 return 1; 157 } 158 159 void const* mapbase = MAP_FAILED; 160 ssize_t mapsize = -1; 161 162 void* base = NULL; 163 uint32_t w, s, h, f; 164 android_dataspace d; 165 size_t size = 0; 166 167 // Maps orientations from DisplayInfo to ISurfaceComposer 168 static const uint32_t ORIENTATION_MAP[] = { 169 ISurfaceComposer::eRotateNone, // 0 == DISPLAY_ORIENTATION_0 170 ISurfaceComposer::eRotate270, // 1 == DISPLAY_ORIENTATION_90 171 ISurfaceComposer::eRotate180, // 2 == DISPLAY_ORIENTATION_180 172 ISurfaceComposer::eRotate90, // 3 == DISPLAY_ORIENTATION_270 173 }; 174 175 // setThreadPoolMaxThreadCount(0) actually tells the kernel it's 176 // not allowed to spawn any additional threads, but we still spawn 177 // a binder thread from userspace when we call startThreadPool(). 178 // See b/36066697 for rationale 179 ProcessState::self()->setThreadPoolMaxThreadCount(0); 180 ProcessState::self()->startThreadPool(); 181 182 sp<IBinder> display = SurfaceComposerClient::getBuiltInDisplay(displayId); 183 if (display == NULL) { 184 fprintf(stderr, "Unable to get handle for display %d\n", displayId); 185 // b/36066697: Avoid running static destructors. 186 _exit(1); 187 } 188 189 Vector<DisplayInfo> configs; 190 SurfaceComposerClient::getDisplayConfigs(display, &configs); 191 int activeConfig = SurfaceComposerClient::getActiveConfig(display); 192 if (static_cast<size_t>(activeConfig) >= configs.size()) { 193 fprintf(stderr, "Active config %d not inside configs (size %zu)\n", 194 activeConfig, configs.size()); 195 // b/36066697: Avoid running static destructors. 196 _exit(1); 197 } 198 uint8_t displayOrientation = configs[activeConfig].orientation; 199 uint32_t captureOrientation = ORIENTATION_MAP[displayOrientation]; 200 201 sp<GraphicBuffer> outBuffer; 202 status_t result = ScreenshotClient::capture(display, Rect(), 0 /* reqWidth */, 203 0 /* reqHeight */, INT32_MIN, INT32_MAX, /* all layers */ false, captureOrientation, 204 &outBuffer); 205 if (result != NO_ERROR) { 206 close(fd); 207 _exit(1); 208 } 209 210 result = outBuffer->lock(GraphicBuffer::USAGE_SW_READ_OFTEN, &base); 211 212 if (base == NULL) { 213 close(fd); 214 _exit(1); 215 } 216 217 w = outBuffer->getWidth(); 218 h = outBuffer->getHeight(); 219 s = outBuffer->getStride(); 220 f = outBuffer->getPixelFormat(); 221 d = HAL_DATASPACE_UNKNOWN; 222 size = s * h * bytesPerPixel(f); 223 224 if (png) { 225 const SkImageInfo info = 226 SkImageInfo::Make(w, h, flinger2skia(f), kPremul_SkAlphaType, dataSpaceToColorSpace(d)); 227 SkPixmap pixmap(info, base, s * bytesPerPixel(f)); 228 struct FDWStream final : public SkWStream { 229 size_t fBytesWritten = 0; 230 int fFd; 231 FDWStream(int f) : fFd(f) {} 232 size_t bytesWritten() const override { return fBytesWritten; } 233 bool write(const void* buffer, size_t size) override { 234 fBytesWritten += size; 235 return size == 0 || ::write(fFd, buffer, size) > 0; 236 } 237 } fdStream(fd); 238 (void)SkEncodeImage(&fdStream, pixmap, SkEncodedImageFormat::kPNG, 100); 239 if (fn != NULL) { 240 notifyMediaScanner(fn); 241 } 242 } else { 243 uint32_t c = dataSpaceToInt(d); 244 write(fd, &w, 4); 245 write(fd, &h, 4); 246 write(fd, &f, 4); 247 write(fd, &c, 4); 248 size_t Bpp = bytesPerPixel(f); 249 for (size_t y=0 ; y<h ; y++) { 250 write(fd, base, w*Bpp); 251 base = (void *)((char *)base + s*Bpp); 252 } 253 } 254 close(fd); 255 if (mapbase != MAP_FAILED) { 256 munmap((void *)mapbase, mapsize); 257 } 258 259 // b/36066697: Avoid running static destructors. 260 _exit(0); 261}