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      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 
     22 #include <linux/fb.h>
     23 #include <sys/ioctl.h>
     24 #include <sys/mman.h>
     25 
     26 #include <binder/ProcessState.h>
     27 
     28 #include <gui/SurfaceComposerClient.h>
     29 #include <gui/ISurfaceComposer.h>
     30 
     31 #include <ui/PixelFormat.h>
     32 
     33 #include <SkImageEncoder.h>
     34 #include <SkBitmap.h>
     35 #include <SkData.h>
     36 #include <SkStream.h>
     37 
     38 using namespace android;
     39 
     40 static uint32_t DEFAULT_DISPLAY_ID = ISurfaceComposer::eDisplayIdMain;
     41 
     42 static void usage(const char* pname)
     43 {
     44     fprintf(stderr,
     45             "usage: %s [-hp] [-d display-id] [FILENAME]\n"
     46             "   -h: this message\n"
     47             "   -p: save the file as a png.\n"
     48             "   -d: specify the display id to capture, default %d.\n"
     49             "If FILENAME ends with .png it will be saved as a png.\n"
     50             "If FILENAME is not given, the results will be printed to stdout.\n",
     51             pname, DEFAULT_DISPLAY_ID
     52     );
     53 }
     54 
     55 static SkColorType flinger2skia(PixelFormat f)
     56 {
     57     switch (f) {
     58         case PIXEL_FORMAT_RGB_565:
     59             return kRGB_565_SkColorType;
     60         default:
     61             return kN32_SkColorType;
     62     }
     63 }
     64 
     65 static status_t vinfoToPixelFormat(const fb_var_screeninfo& vinfo,
     66         uint32_t* bytespp, uint32_t* f)
     67 {
     68 
     69     switch (vinfo.bits_per_pixel) {
     70         case 16:
     71             *f = PIXEL_FORMAT_RGB_565;
     72             *bytespp = 2;
     73             break;
     74         case 24:
     75             *f = PIXEL_FORMAT_RGB_888;
     76             *bytespp = 3;
     77             break;
     78         case 32:
     79             // TODO: do better decoding of vinfo here
     80             *f = PIXEL_FORMAT_RGBX_8888;
     81             *bytespp = 4;
     82             break;
     83         default:
     84             return BAD_VALUE;
     85     }
     86     return NO_ERROR;
     87 }
     88 
     89 int main(int argc, char** argv)
     90 {
     91     ProcessState::self()->startThreadPool();
     92 
     93     const char* pname = argv[0];
     94     bool png = false;
     95     int32_t displayId = DEFAULT_DISPLAY_ID;
     96     int c;
     97     while ((c = getopt(argc, argv, "phd:")) != -1) {
     98         switch (c) {
     99             case 'p':
    100                 png = true;
    101                 break;
    102             case 'd':
    103                 displayId = atoi(optarg);
    104                 break;
    105             case '?':
    106             case 'h':
    107                 usage(pname);
    108                 return 1;
    109         }
    110     }
    111     argc -= optind;
    112     argv += optind;
    113 
    114     int fd = -1;
    115     if (argc == 0) {
    116         fd = dup(STDOUT_FILENO);
    117     } else if (argc == 1) {
    118         const char* fn = argv[0];
    119         fd = open(fn, O_WRONLY | O_CREAT | O_TRUNC, 0664);
    120         if (fd == -1) {
    121             fprintf(stderr, "Error opening file: %s (%s)\n", fn, strerror(errno));
    122             return 1;
    123         }
    124         const int len = strlen(fn);
    125         if (len >= 4 && 0 == strcmp(fn+len-4, ".png")) {
    126             png = true;
    127         }
    128     }
    129 
    130     if (fd == -1) {
    131         usage(pname);
    132         return 1;
    133     }
    134 
    135     void const* mapbase = MAP_FAILED;
    136     ssize_t mapsize = -1;
    137 
    138     void const* base = 0;
    139     uint32_t w, s, h, f;
    140     size_t size = 0;
    141 
    142     ScreenshotClient screenshot;
    143     sp<IBinder> display = SurfaceComposerClient::getBuiltInDisplay(displayId);
    144     if (display != NULL && screenshot.update(display, Rect(), false) == NO_ERROR) {
    145         base = screenshot.getPixels();
    146         w = screenshot.getWidth();
    147         h = screenshot.getHeight();
    148         s = screenshot.getStride();
    149         f = screenshot.getFormat();
    150         size = screenshot.getSize();
    151     } else {
    152         const char* fbpath = "/dev/graphics/fb0";
    153         int fb = open(fbpath, O_RDONLY);
    154         if (fb >= 0) {
    155             struct fb_var_screeninfo vinfo;
    156             if (ioctl(fb, FBIOGET_VSCREENINFO, &vinfo) == 0) {
    157                 uint32_t bytespp;
    158                 if (vinfoToPixelFormat(vinfo, &bytespp, &f) == NO_ERROR) {
    159                     size_t offset = (vinfo.xoffset + vinfo.yoffset*vinfo.xres) * bytespp;
    160                     w = vinfo.xres;
    161                     h = vinfo.yres;
    162                     s = vinfo.xres;
    163                     size = w*h*bytespp;
    164                     mapsize = offset + size;
    165                     mapbase = mmap(0, mapsize, PROT_READ, MAP_PRIVATE, fb, 0);
    166                     if (mapbase != MAP_FAILED) {
    167                         base = (void const *)((char const *)mapbase + offset);
    168                     }
    169                 }
    170             }
    171             close(fb);
    172         }
    173     }
    174 
    175     if (base) {
    176         if (png) {
    177             const SkImageInfo info = SkImageInfo::Make(w, h, flinger2skia(f),
    178                                                        kPremul_SkAlphaType);
    179             SkBitmap b;
    180             b.installPixels(info, const_cast<void*>(base), s*bytesPerPixel(f));
    181             SkDynamicMemoryWStream stream;
    182             SkImageEncoder::EncodeStream(&stream, b,
    183                     SkImageEncoder::kPNG_Type, SkImageEncoder::kDefaultQuality);
    184             SkData* streamData = stream.copyToData();
    185             write(fd, streamData->data(), streamData->size());
    186             streamData->unref();
    187         } else {
    188             write(fd, &w, 4);
    189             write(fd, &h, 4);
    190             write(fd, &f, 4);
    191             size_t Bpp = bytesPerPixel(f);
    192             for (size_t y=0 ; y<h ; y++) {
    193                 write(fd, base, w*Bpp);
    194                 base = (void *)((char *)base + s*Bpp);
    195             }
    196         }
    197     }
    198     close(fd);
    199     if (mapbase != MAP_FAILED) {
    200         munmap((void *)mapbase, mapsize);
    201     }
    202     return 0;
    203 }
    204