/* * 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 <linux/fb.h> #include <sys/ioctl.h> #include <sys/mman.h> #include <binder/IMemory.h> #include <gui/SurfaceComposerClient.h> #include <gui/ISurfaceComposer.h> #include <SkImageEncoder.h> #include <SkBitmap.h> #include <SkData.h> #include <SkStream.h> using namespace android; static uint32_t DEFAULT_DISPLAY_ID = ISurfaceComposer::eDisplayIdMain; static void usage(const char* pname) { 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 display id to capture, default %d.\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, DEFAULT_DISPLAY_ID ); } static SkBitmap::Config flinger2skia(PixelFormat f) { switch (f) { case PIXEL_FORMAT_A_8: return SkBitmap::kA8_Config; case PIXEL_FORMAT_RGB_565: return SkBitmap::kRGB_565_Config; case PIXEL_FORMAT_RGBA_4444: return SkBitmap::kARGB_4444_Config; default: return SkBitmap::kARGB_8888_Config; } } static status_t vinfoToPixelFormat(const fb_var_screeninfo& vinfo, uint32_t* bytespp, uint32_t* f) { switch (vinfo.bits_per_pixel) { case 16: *f = PIXEL_FORMAT_RGB_565; *bytespp = 2; break; case 24: *f = PIXEL_FORMAT_RGB_888; *bytespp = 3; break; case 32: // TODO: do better decoding of vinfo here *f = PIXEL_FORMAT_RGBX_8888; *bytespp = 4; break; default: return BAD_VALUE; } return NO_ERROR; } int main(int argc, char** argv) { const char* pname = argv[0]; bool png = false; int32_t displayId = DEFAULT_DISPLAY_ID; int c; while ((c = getopt(argc, argv, "phd:")) != -1) { switch (c) { case 'p': png = true; break; case 'd': displayId = atoi(optarg); break; case '?': case 'h': usage(pname); return 1; } } argc -= optind; argv += optind; int fd = -1; if (argc == 0) { fd = dup(STDOUT_FILENO); } else if (argc == 1) { const char* 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); return 1; } void const* mapbase = MAP_FAILED; ssize_t mapsize = -1; void const* base = 0; uint32_t w, h, f; size_t size = 0; ScreenshotClient screenshot; sp<IBinder> display = SurfaceComposerClient::getBuiltInDisplay(displayId); if (display != NULL && screenshot.update(display) == NO_ERROR) { base = screenshot.getPixels(); w = screenshot.getWidth(); h = screenshot.getHeight(); f = screenshot.getFormat(); size = screenshot.getSize(); } else { const char* fbpath = "/dev/graphics/fb0"; int fb = open(fbpath, O_RDONLY); if (fb >= 0) { struct fb_var_screeninfo vinfo; if (ioctl(fb, FBIOGET_VSCREENINFO, &vinfo) == 0) { uint32_t bytespp; if (vinfoToPixelFormat(vinfo, &bytespp, &f) == NO_ERROR) { size_t offset = (vinfo.xoffset + vinfo.yoffset*vinfo.xres) * bytespp; w = vinfo.xres; h = vinfo.yres; size = w*h*bytespp; mapsize = offset + size; mapbase = mmap(0, mapsize, PROT_READ, MAP_PRIVATE, fb, 0); if (mapbase != MAP_FAILED) { base = (void const *)((char const *)mapbase + offset); } } } close(fb); } } if (base) { if (png) { SkBitmap b; b.setConfig(flinger2skia(f), w, h); b.setPixels((void*)base); SkDynamicMemoryWStream stream; SkImageEncoder::EncodeStream(&stream, b, SkImageEncoder::kPNG_Type, SkImageEncoder::kDefaultQuality); SkData* streamData = stream.copyToData(); write(fd, streamData->data(), streamData->size()); streamData->unref(); } else { write(fd, &w, 4); write(fd, &h, 4); write(fd, &f, 4); write(fd, base, size); } } close(fd); if (mapbase != MAP_FAILED) { munmap((void *)mapbase, mapsize); } return 0; }