blob: d4da5e5545918156142bfb83edd43230e994bb84 [file] [log] [blame]
/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <linux/fb.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/wait.h>
#include <android/bitmap.h>
#include <binder/ProcessState.h>
#include <gui/ISurfaceComposer.h>
#include <gui/SurfaceComposerClient.h>
#include <gui/SyncScreenCaptureListener.h>
#include <ui/GraphicTypes.h>
#include <ui/PixelFormat.h>
#include <system/graphics.h>
using namespace android;
#define COLORSPACE_UNKNOWN 0
#define COLORSPACE_SRGB 1
#define COLORSPACE_DISPLAY_P3 2
static void usage(const char* pname, PhysicalDisplayId displayId)
{
fprintf(stderr,
"usage: %s [-hp] [-d display-id] [FILENAME]\n"
" -h: this message\n"
" -p: save the file as a png.\n"
" -d: specify the physical display ID to capture (default: %s)\n"
" see \"dumpsys SurfaceFlinger --display-id\" for valid display IDs.\n"
"If FILENAME ends with .png it will be saved as a png.\n"
"If FILENAME is not given, the results will be printed to stdout.\n",
pname, to_string(displayId).c_str());
}
static int32_t flinger2bitmapFormat(PixelFormat f)
{
switch (f) {
case PIXEL_FORMAT_RGB_565:
return ANDROID_BITMAP_FORMAT_RGB_565;
default:
return ANDROID_BITMAP_FORMAT_RGBA_8888;
}
}
static uint32_t dataSpaceToInt(ui::Dataspace d)
{
switch (d) {
case ui::Dataspace::V0_SRGB:
return COLORSPACE_SRGB;
case ui::Dataspace::DISPLAY_P3:
return COLORSPACE_DISPLAY_P3;
default:
return COLORSPACE_UNKNOWN;
}
}
static status_t notifyMediaScanner(const char* fileName) {
std::string filePath("file://");
filePath.append(fileName);
char *cmd[] = {
(char*) "am",
(char*) "broadcast",
(char*) "-a",
(char*) "android.intent.action.MEDIA_SCANNER_SCAN_FILE",
(char*) "-d",
&filePath[0],
nullptr
};
int status;
int pid = fork();
if (pid < 0){
fprintf(stderr, "Unable to fork in order to send intent for media scanner.\n");
return UNKNOWN_ERROR;
}
if (pid == 0){
int fd = open("/dev/null", O_WRONLY);
if (fd < 0){
fprintf(stderr, "Unable to open /dev/null for media scanner stdout redirection.\n");
exit(1);
}
dup2(fd, 1);
int result = execvp(cmd[0], cmd);
close(fd);
exit(result);
}
wait(&status);
if (status < 0) {
fprintf(stderr, "Unable to broadcast intent for media scanner.\n");
return UNKNOWN_ERROR;
}
return NO_ERROR;
}
int main(int argc, char** argv)
{
std::optional<PhysicalDisplayId> displayId = SurfaceComposerClient::getInternalDisplayId();
if (!displayId) {
fprintf(stderr, "Failed to get token for internal display\n");
return 1;
}
const char* pname = argv[0];
bool png = false;
int c;
while ((c = getopt(argc, argv, "phd:")) != -1) {
switch (c) {
case 'p':
png = true;
break;
case 'd':
displayId = PhysicalDisplayId(atoll(optarg));
break;
case '?':
case 'h':
usage(pname, *displayId);
return 1;
}
}
argc -= optind;
argv += optind;
int fd = -1;
const char* fn = NULL;
if (argc == 0) {
fd = dup(STDOUT_FILENO);
} else if (argc == 1) {
fn = argv[0];
fd = open(fn, O_WRONLY | O_CREAT | O_TRUNC, 0664);
if (fd == -1) {
fprintf(stderr, "Error opening file: %s (%s)\n", fn, strerror(errno));
return 1;
}
const int len = strlen(fn);
if (len >= 4 && 0 == strcmp(fn+len-4, ".png")) {
png = true;
}
}
if (fd == -1) {
usage(pname, *displayId);
return 1;
}
void const* mapbase = MAP_FAILED;
ssize_t mapsize = -1;
void* base = NULL;
// setThreadPoolMaxThreadCount(0) actually tells the kernel it's
// not allowed to spawn any additional threads, but we still spawn
// a binder thread from userspace when we call startThreadPool().
// See b/36066697 for rationale
ProcessState::self()->setThreadPoolMaxThreadCount(0);
ProcessState::self()->startThreadPool();
sp<SyncScreenCaptureListener> captureListener = new SyncScreenCaptureListener();
status_t result = ScreenshotClient::captureDisplay(displayId->value, captureListener);
if (result != NO_ERROR) {
close(fd);
return 1;
}
ScreenCaptureResults captureResults = captureListener->waitForResults();
if (captureResults.result != NO_ERROR) {
close(fd);
return 1;
}
ui::Dataspace dataspace = captureResults.capturedDataspace;
sp<GraphicBuffer> buffer = captureResults.buffer;
result = buffer->lock(GraphicBuffer::USAGE_SW_READ_OFTEN, &base);
if (base == nullptr || result != NO_ERROR) {
String8 reason;
if (result != NO_ERROR) {
reason.appendFormat(" Error Code: %d", result);
} else {
reason = "Failed to write to buffer";
}
fprintf(stderr, "Failed to take screenshot (%s)\n", reason.c_str());
close(fd);
return 1;
}
if (png) {
AndroidBitmapInfo info;
info.format = flinger2bitmapFormat(buffer->getPixelFormat());
info.flags = ANDROID_BITMAP_FLAGS_ALPHA_PREMUL;
info.width = buffer->getWidth();
info.height = buffer->getHeight();
info.stride = buffer->getStride() * bytesPerPixel(buffer->getPixelFormat());
int result = AndroidBitmap_compress(&info, static_cast<int32_t>(dataspace), base,
ANDROID_BITMAP_COMPRESS_FORMAT_PNG, 100, &fd,
[](void* fdPtr, const void* data, size_t size) -> bool {
int bytesWritten = write(*static_cast<int*>(fdPtr),
data, size);
return bytesWritten == size;
});
if (result != ANDROID_BITMAP_RESULT_SUCCESS) {
fprintf(stderr, "Failed to compress PNG (error code: %d)\n", result);
}
if (fn != NULL) {
notifyMediaScanner(fn);
}
} else {
uint32_t w = buffer->getWidth();
uint32_t h = buffer->getHeight();
uint32_t s = buffer->getStride();
uint32_t f = buffer->getPixelFormat();
uint32_t c = dataSpaceToInt(dataspace);
write(fd, &w, 4);
write(fd, &h, 4);
write(fd, &f, 4);
write(fd, &c, 4);
size_t Bpp = bytesPerPixel(f);
for (size_t y=0 ; y<h ; y++) {
write(fd, base, w*Bpp);
base = (void *)((char *)base + s*Bpp);
}
}
close(fd);
if (mapbase != MAP_FAILED) {
munmap((void *)mapbase, mapsize);
}
return 0;
}