0bda2e3cfb
Remove undocumented fallback to layer stack, since virtual displays can now be specified by their unambiguous IDs. Bug: 182939859 Test: screencap -d <id> Change-Id: I86a8e713d8076abe55aeeb327fd9d746c46e5a40
264 lines
7.8 KiB
C++
264 lines
7.8 KiB
C++
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <errno.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <linux/fb.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <sys/wait.h>
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#include <android/bitmap.h>
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#include <binder/ProcessState.h>
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#include <gui/ISurfaceComposer.h>
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#include <gui/SurfaceComposerClient.h>
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#include <gui/SyncScreenCaptureListener.h>
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#include <ui/GraphicTypes.h>
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#include <ui/PixelFormat.h>
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#include <system/graphics.h>
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using namespace android;
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#define COLORSPACE_UNKNOWN 0
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#define COLORSPACE_SRGB 1
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#define COLORSPACE_DISPLAY_P3 2
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static void usage(const char* pname, DisplayId displayId)
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{
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fprintf(stderr,
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"usage: %s [-hp] [-d display-id] [FILENAME]\n"
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" -h: this message\n"
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" -p: save the file as a png.\n"
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" -d: specify the display ID to capture (default: %s)\n"
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" see \"dumpsys SurfaceFlinger --display-id\" for valid display IDs.\n"
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"If FILENAME ends with .png it will be saved as a png.\n"
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"If FILENAME is not given, the results will be printed to stdout.\n",
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pname, to_string(displayId).c_str());
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}
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static int32_t flinger2bitmapFormat(PixelFormat f)
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{
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switch (f) {
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case PIXEL_FORMAT_RGB_565:
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return ANDROID_BITMAP_FORMAT_RGB_565;
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default:
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return ANDROID_BITMAP_FORMAT_RGBA_8888;
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}
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}
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static uint32_t dataSpaceToInt(ui::Dataspace d)
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{
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switch (d) {
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case ui::Dataspace::V0_SRGB:
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return COLORSPACE_SRGB;
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case ui::Dataspace::DISPLAY_P3:
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return COLORSPACE_DISPLAY_P3;
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default:
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return COLORSPACE_UNKNOWN;
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}
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}
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static status_t notifyMediaScanner(const char* fileName) {
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std::string filePath("file://");
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filePath.append(fileName);
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char *cmd[] = {
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(char*) "am",
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(char*) "broadcast",
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(char*) "-a",
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(char*) "android.intent.action.MEDIA_SCANNER_SCAN_FILE",
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(char*) "-d",
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&filePath[0],
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nullptr
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};
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int status;
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int pid = fork();
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if (pid < 0){
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fprintf(stderr, "Unable to fork in order to send intent for media scanner.\n");
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return UNKNOWN_ERROR;
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}
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if (pid == 0){
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int fd = open("/dev/null", O_WRONLY);
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if (fd < 0){
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fprintf(stderr, "Unable to open /dev/null for media scanner stdout redirection.\n");
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exit(1);
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}
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dup2(fd, 1);
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int result = execvp(cmd[0], cmd);
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close(fd);
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exit(result);
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}
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wait(&status);
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if (status < 0) {
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fprintf(stderr, "Unable to broadcast intent for media scanner.\n");
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return UNKNOWN_ERROR;
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}
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return NO_ERROR;
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}
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int main(int argc, char** argv)
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{
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std::optional<DisplayId> displayId = SurfaceComposerClient::getInternalDisplayId();
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if (!displayId) {
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fprintf(stderr, "Failed to get ID for internal display\n");
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return 1;
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}
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const char* pname = argv[0];
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bool png = false;
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int c;
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while ((c = getopt(argc, argv, "phd:")) != -1) {
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switch (c) {
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case 'p':
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png = true;
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break;
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case 'd':
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displayId = DisplayId::fromValue(atoll(optarg));
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if (!displayId) {
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fprintf(stderr, "Invalid display ID\n");
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return 1;
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}
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break;
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case '?':
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case 'h':
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usage(pname, *displayId);
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return 1;
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}
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}
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argc -= optind;
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argv += optind;
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int fd = -1;
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const char* fn = NULL;
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if (argc == 0) {
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fd = dup(STDOUT_FILENO);
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} else if (argc == 1) {
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fn = argv[0];
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fd = open(fn, O_WRONLY | O_CREAT | O_TRUNC, 0664);
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if (fd == -1) {
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fprintf(stderr, "Error opening file: %s (%s)\n", fn, strerror(errno));
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return 1;
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}
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const int len = strlen(fn);
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if (len >= 4 && 0 == strcmp(fn+len-4, ".png")) {
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png = true;
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}
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}
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if (fd == -1) {
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usage(pname, *displayId);
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return 1;
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}
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void const* mapbase = MAP_FAILED;
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ssize_t mapsize = -1;
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void* base = NULL;
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// setThreadPoolMaxThreadCount(0) actually tells the kernel it's
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// not allowed to spawn any additional threads, but we still spawn
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// a binder thread from userspace when we call startThreadPool().
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// See b/36066697 for rationale
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ProcessState::self()->setThreadPoolMaxThreadCount(0);
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ProcessState::self()->startThreadPool();
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sp<SyncScreenCaptureListener> captureListener = new SyncScreenCaptureListener();
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status_t result = ScreenshotClient::captureDisplay(*displayId, captureListener);
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if (result != NO_ERROR) {
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close(fd);
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return 1;
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}
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ScreenCaptureResults captureResults = captureListener->waitForResults();
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if (captureResults.result != NO_ERROR) {
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close(fd);
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return 1;
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}
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ui::Dataspace dataspace = captureResults.capturedDataspace;
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sp<GraphicBuffer> buffer = captureResults.buffer;
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result = buffer->lock(GraphicBuffer::USAGE_SW_READ_OFTEN, &base);
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if (base == nullptr || result != NO_ERROR) {
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String8 reason;
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if (result != NO_ERROR) {
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reason.appendFormat(" Error Code: %d", result);
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} else {
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reason = "Failed to write to buffer";
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}
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fprintf(stderr, "Failed to take screenshot (%s)\n", reason.c_str());
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close(fd);
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return 1;
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}
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if (png) {
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AndroidBitmapInfo info;
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info.format = flinger2bitmapFormat(buffer->getPixelFormat());
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info.flags = ANDROID_BITMAP_FLAGS_ALPHA_PREMUL;
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info.width = buffer->getWidth();
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info.height = buffer->getHeight();
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info.stride = buffer->getStride() * bytesPerPixel(buffer->getPixelFormat());
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int result = AndroidBitmap_compress(&info, static_cast<int32_t>(dataspace), base,
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ANDROID_BITMAP_COMPRESS_FORMAT_PNG, 100, &fd,
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[](void* fdPtr, const void* data, size_t size) -> bool {
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int bytesWritten = write(*static_cast<int*>(fdPtr),
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data, size);
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return bytesWritten == size;
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});
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if (result != ANDROID_BITMAP_RESULT_SUCCESS) {
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fprintf(stderr, "Failed to compress PNG (error code: %d)\n", result);
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}
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if (fn != NULL) {
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notifyMediaScanner(fn);
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}
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} else {
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uint32_t w = buffer->getWidth();
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uint32_t h = buffer->getHeight();
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uint32_t s = buffer->getStride();
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uint32_t f = buffer->getPixelFormat();
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uint32_t c = dataSpaceToInt(dataspace);
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write(fd, &w, 4);
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write(fd, &h, 4);
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write(fd, &f, 4);
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write(fd, &c, 4);
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size_t Bpp = bytesPerPixel(f);
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for (size_t y=0 ; y<h ; y++) {
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write(fd, base, w*Bpp);
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base = (void *)((char *)base + s*Bpp);
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}
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}
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close(fd);
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if (mapbase != MAP_FAILED) {
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munmap((void *)mapbase, mapsize);
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}
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return 0;
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}
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