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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/IMemory.h>
     27 #include <gui/SurfaceComposerClient.h>
     28 
     29 #include <SkImageEncoder.h>
     30 #include <SkBitmap.h>
     31 #include <SkData.h>
     32 #include <SkStream.h>
     33 
     34 using namespace android;
     35 
     36 static void usage(const char* pname)
     37 {
     38     fprintf(stderr,
     39             "usage: %s [-hp] [FILENAME]\n"
     40             "   -h: this message\n"
     41             "   -p: save the file as a png.\n"
     42             "If FILENAME ends with .png it will be saved as a png.\n"
     43             "If FILENAME is not given, the results will be printed to stdout.\n",
     44             pname
     45     );
     46 }
     47 
     48 static SkBitmap::Config flinger2skia(PixelFormat f)
     49 {
     50     switch (f) {
     51         case PIXEL_FORMAT_A_8:
     52             return SkBitmap::kA8_Config;
     53         case PIXEL_FORMAT_RGB_565:
     54             return SkBitmap::kRGB_565_Config;
     55         case PIXEL_FORMAT_RGBA_4444:
     56             return SkBitmap::kARGB_4444_Config;
     57         default:
     58             return SkBitmap::kARGB_8888_Config;
     59     }
     60 }
     61 
     62 static status_t vinfoToPixelFormat(const fb_var_screeninfo& vinfo,
     63         uint32_t* bytespp, uint32_t* f)
     64 {
     65 
     66     switch (vinfo.bits_per_pixel) {
     67         case 16:
     68             *f = PIXEL_FORMAT_RGB_565;
     69             *bytespp = 2;
     70             break;
     71         case 24:
     72             *f = PIXEL_FORMAT_RGB_888;
     73             *bytespp = 3;
     74             break;
     75         case 32:
     76             // TODO: do better decoding of vinfo here
     77             *f = PIXEL_FORMAT_RGBX_8888;
     78             *bytespp = 4;
     79             break;
     80         default:
     81             return BAD_VALUE;
     82     }
     83     return NO_ERROR;
     84 }
     85 
     86 int main(int argc, char** argv)
     87 {
     88     const char* pname = argv[0];
     89     bool png = false;
     90     int c;
     91     while ((c = getopt(argc, argv, "ph")) != -1) {
     92         switch (c) {
     93             case 'p':
     94                 png = true;
     95                 break;
     96             case '?':
     97             case 'h':
     98                 usage(pname);
     99                 return 1;
    100         }
    101     }
    102     argc -= optind;
    103     argv += optind;
    104 
    105     int fd = -1;
    106     if (argc == 0) {
    107         fd = dup(STDOUT_FILENO);
    108     } else if (argc == 1) {
    109         const char* fn = argv[0];
    110         fd = open(fn, O_WRONLY | O_CREAT | O_TRUNC, 0664);
    111         if (fd == -1) {
    112             fprintf(stderr, "Error opening file: %s (%s)\n", fn, strerror(errno));
    113             return 1;
    114         }
    115         const int len = strlen(fn);
    116         if (len >= 4 && 0 == strcmp(fn+len-4, ".png")) {
    117             png = true;
    118         }
    119     }
    120 
    121     if (fd == -1) {
    122         usage(pname);
    123         return 1;
    124     }
    125 
    126     void const* mapbase = MAP_FAILED;
    127     ssize_t mapsize = -1;
    128 
    129     void const* base = 0;
    130     uint32_t w, h, f;
    131     size_t size = 0;
    132 
    133     ScreenshotClient screenshot;
    134     if (screenshot.update() == NO_ERROR) {
    135         base = screenshot.getPixels();
    136         w = screenshot.getWidth();
    137         h = screenshot.getHeight();
    138         f = screenshot.getFormat();
    139         size = screenshot.getSize();
    140     } else {
    141         const char* fbpath = "/dev/graphics/fb0";
    142         int fb = open(fbpath, O_RDONLY);
    143         if (fb >= 0) {
    144             struct fb_var_screeninfo vinfo;
    145             if (ioctl(fb, FBIOGET_VSCREENINFO, &vinfo) == 0) {
    146                 uint32_t bytespp;
    147                 if (vinfoToPixelFormat(vinfo, &bytespp, &f) == NO_ERROR) {
    148                     size_t offset = (vinfo.xoffset + vinfo.yoffset*vinfo.xres) * bytespp;
    149                     w = vinfo.xres;
    150                     h = vinfo.yres;
    151                     size = w*h*bytespp;
    152                     mapsize = offset + size;
    153                     mapbase = mmap(0, mapsize, PROT_READ, MAP_PRIVATE, fb, 0);
    154                     if (mapbase != MAP_FAILED) {
    155                         base = (void const *)((char const *)mapbase + offset);
    156                     }
    157                 }
    158             }
    159             close(fb);
    160         }
    161     }
    162 
    163     if (base) {
    164         if (png) {
    165             SkBitmap b;
    166             b.setConfig(flinger2skia(f), w, h);
    167             b.setPixels((void*)base);
    168             SkDynamicMemoryWStream stream;
    169             SkImageEncoder::EncodeStream(&stream, b,
    170                     SkImageEncoder::kPNG_Type, SkImageEncoder::kDefaultQuality);
    171             SkData* streamData = stream.copyToData();
    172             write(fd, streamData->data(), streamData->size());
    173             streamData->unref();
    174         } else {
    175             write(fd, &w, 4);
    176             write(fd, &h, 4);
    177             write(fd, &f, 4);
    178             write(fd, base, size);
    179         }
    180     }
    181     close(fd);
    182     if (mapbase != MAP_FAILED) {
    183         munmap((void *)mapbase, mapsize);
    184     }
    185     return 0;
    186 }
    187