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
usage(const char * pname)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
flinger2skia(PixelFormat f)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
vinfoToPixelFormat(const fb_var_screeninfo & vinfo,uint32_t * bytespp,uint32_t * f)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
main(int argc,char ** argv)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