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#include <gui/ISurfaceComposer.h>
29
30#include <SkImageEncoder.h>
31#include <SkBitmap.h>
32#include <SkData.h>
33#include <SkStream.h>
34
35using namespace android;
36
37static uint32_t DEFAULT_DISPLAY_ID = ISurfaceComposer::eDisplayIdMain;
38
39static void usage(const char* pname)
40{
41    fprintf(stderr,
42            "usage: %s [-hp] [-d display-id] [FILENAME]\n"
43            "   -h: this message\n"
44            "   -p: save the file as a png.\n"
45            "   -d: specify the display id to capture, default %d.\n"
46            "If FILENAME ends with .png it will be saved as a png.\n"
47            "If FILENAME is not given, the results will be printed to stdout.\n",
48            pname, DEFAULT_DISPLAY_ID
49    );
50}
51
52static SkBitmap::Config flinger2skia(PixelFormat f)
53{
54    switch (f) {
55        case PIXEL_FORMAT_A_8:
56            return SkBitmap::kA8_Config;
57        case PIXEL_FORMAT_RGB_565:
58            return SkBitmap::kRGB_565_Config;
59        case PIXEL_FORMAT_RGBA_4444:
60            return SkBitmap::kARGB_4444_Config;
61        default:
62            return SkBitmap::kARGB_8888_Config;
63    }
64}
65
66static status_t vinfoToPixelFormat(const fb_var_screeninfo& vinfo,
67        uint32_t* bytespp, uint32_t* f)
68{
69
70    switch (vinfo.bits_per_pixel) {
71        case 16:
72            *f = PIXEL_FORMAT_RGB_565;
73            *bytespp = 2;
74            break;
75        case 24:
76            *f = PIXEL_FORMAT_RGB_888;
77            *bytespp = 3;
78            break;
79        case 32:
80            // TODO: do better decoding of vinfo here
81            *f = PIXEL_FORMAT_RGBX_8888;
82            *bytespp = 4;
83            break;
84        default:
85            return BAD_VALUE;
86    }
87    return NO_ERROR;
88}
89
90int main(int argc, char** argv)
91{
92    const char* pname = argv[0];
93    bool png = false;
94    int32_t displayId = DEFAULT_DISPLAY_ID;
95    int c;
96    while ((c = getopt(argc, argv, "phd:")) != -1) {
97        switch (c) {
98            case 'p':
99                png = true;
100                break;
101            case 'd':
102                displayId = atoi(optarg);
103                break;
104            case '?':
105            case 'h':
106                usage(pname);
107                return 1;
108        }
109    }
110    argc -= optind;
111    argv += optind;
112
113    int fd = -1;
114    if (argc == 0) {
115        fd = dup(STDOUT_FILENO);
116    } else if (argc == 1) {
117        const char* fn = argv[0];
118        fd = open(fn, O_WRONLY | O_CREAT | O_TRUNC, 0664);
119        if (fd == -1) {
120            fprintf(stderr, "Error opening file: %s (%s)\n", fn, strerror(errno));
121            return 1;
122        }
123        const int len = strlen(fn);
124        if (len >= 4 && 0 == strcmp(fn+len-4, ".png")) {
125            png = true;
126        }
127    }
128
129    if (fd == -1) {
130        usage(pname);
131        return 1;
132    }
133
134    void const* mapbase = MAP_FAILED;
135    ssize_t mapsize = -1;
136
137    void const* base = 0;
138    uint32_t w, h, f;
139    size_t size = 0;
140
141    ScreenshotClient screenshot;
142    sp<IBinder> display = SurfaceComposerClient::getBuiltInDisplay(displayId);
143    if (display != NULL && screenshot.update(display) == NO_ERROR) {
144        base = screenshot.getPixels();
145        w = screenshot.getWidth();
146        h = screenshot.getHeight();
147        f = screenshot.getFormat();
148        size = screenshot.getSize();
149    } else {
150        const char* fbpath = "/dev/graphics/fb0";
151        int fb = open(fbpath, O_RDONLY);
152        if (fb >= 0) {
153            struct fb_var_screeninfo vinfo;
154            if (ioctl(fb, FBIOGET_VSCREENINFO, &vinfo) == 0) {
155                uint32_t bytespp;
156                if (vinfoToPixelFormat(vinfo, &bytespp, &f) == NO_ERROR) {
157                    size_t offset = (vinfo.xoffset + vinfo.yoffset*vinfo.xres) * bytespp;
158                    w = vinfo.xres;
159                    h = vinfo.yres;
160                    size = w*h*bytespp;
161                    mapsize = offset + size;
162                    mapbase = mmap(0, mapsize, PROT_READ, MAP_PRIVATE, fb, 0);
163                    if (mapbase != MAP_FAILED) {
164                        base = (void const *)((char const *)mapbase + offset);
165                    }
166                }
167            }
168            close(fb);
169        }
170    }
171
172    if (base) {
173        if (png) {
174            SkBitmap b;
175            b.setConfig(flinger2skia(f), w, h);
176            b.setPixels((void*)base);
177            SkDynamicMemoryWStream stream;
178            SkImageEncoder::EncodeStream(&stream, b,
179                    SkImageEncoder::kPNG_Type, SkImageEncoder::kDefaultQuality);
180            SkData* streamData = stream.copyToData();
181            write(fd, streamData->data(), streamData->size());
182            streamData->unref();
183        } else {
184            write(fd, &w, 4);
185            write(fd, &h, 4);
186            write(fd, &f, 4);
187            write(fd, base, size);
188        }
189    }
190    close(fd);
191    if (mapbase != MAP_FAILED) {
192        munmap((void *)mapbase, mapsize);
193    }
194    return 0;
195}
196