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 #include <stdlib.h>
22 #include <string.h>
23
24 #include <linux/fb.h>
25 #include <sys/ioctl.h>
26 #include <sys/mman.h>
27
28 #include <binder/ProcessState.h>
29
30 #include <gui/SurfaceComposerClient.h>
31 #include <gui/ISurfaceComposer.h>
32
33 #include <ui/DisplayInfo.h>
34 #include <ui/PixelFormat.h>
35
36 #include <system/graphics.h>
37
38 // TODO: Fix Skia.
39 #pragma GCC diagnostic push
40 #pragma GCC diagnostic ignored "-Wunused-parameter"
41 #include <SkImageEncoder.h>
42 #include <SkData.h>
43 #include <SkColorSpace.h>
44 #pragma GCC diagnostic pop
45
46 using namespace android;
47
48 static uint32_t DEFAULT_DISPLAY_ID = ISurfaceComposer::eDisplayIdMain;
49
50 #define COLORSPACE_UNKNOWN 0
51 #define COLORSPACE_SRGB 1
52 #define COLORSPACE_DISPLAY_P3 2
53
usage(const char * pname)54 static void usage(const char* pname)
55 {
56 fprintf(stderr,
57 "usage: %s [-hp] [-d display-id] [FILENAME]\n"
58 " -h: this message\n"
59 " -p: save the file as a png.\n"
60 " -d: specify the display id to capture, default %d.\n"
61 "If FILENAME ends with .png it will be saved as a png.\n"
62 "If FILENAME is not given, the results will be printed to stdout.\n",
63 pname, DEFAULT_DISPLAY_ID
64 );
65 }
66
flinger2skia(PixelFormat f)67 static SkColorType flinger2skia(PixelFormat f)
68 {
69 switch (f) {
70 case PIXEL_FORMAT_RGB_565:
71 return kRGB_565_SkColorType;
72 default:
73 return kN32_SkColorType;
74 }
75 }
76
dataSpaceToColorSpace(android_dataspace d)77 static sk_sp<SkColorSpace> dataSpaceToColorSpace(android_dataspace d)
78 {
79 switch (d) {
80 case HAL_DATASPACE_V0_SRGB:
81 return SkColorSpace::MakeSRGB();
82 case HAL_DATASPACE_DISPLAY_P3:
83 return SkColorSpace::MakeRGB(
84 SkColorSpace::kSRGB_RenderTargetGamma, SkColorSpace::kDCIP3_D65_Gamut);
85 default:
86 return nullptr;
87 }
88 }
89
dataSpaceToInt(android_dataspace d)90 static uint32_t dataSpaceToInt(android_dataspace d)
91 {
92 switch (d) {
93 case HAL_DATASPACE_V0_SRGB:
94 return COLORSPACE_SRGB;
95 case HAL_DATASPACE_DISPLAY_P3:
96 return COLORSPACE_DISPLAY_P3;
97 default:
98 return COLORSPACE_UNKNOWN;
99 }
100 }
101
notifyMediaScanner(const char * fileName)102 static status_t notifyMediaScanner(const char* fileName) {
103 String8 cmd("am broadcast -a android.intent.action.MEDIA_SCANNER_SCAN_FILE -d file://");
104 cmd.append(fileName);
105 cmd.append(" > /dev/null");
106 int result = system(cmd.string());
107 if (result < 0) {
108 fprintf(stderr, "Unable to broadcast intent for media scanner.\n");
109 return UNKNOWN_ERROR;
110 }
111 return NO_ERROR;
112 }
113
main(int argc,char ** argv)114 int main(int argc, char** argv)
115 {
116 const char* pname = argv[0];
117 bool png = false;
118 int32_t displayId = DEFAULT_DISPLAY_ID;
119 int c;
120 while ((c = getopt(argc, argv, "phd:")) != -1) {
121 switch (c) {
122 case 'p':
123 png = true;
124 break;
125 case 'd':
126 displayId = atoi(optarg);
127 break;
128 case '?':
129 case 'h':
130 usage(pname);
131 return 1;
132 }
133 }
134 argc -= optind;
135 argv += optind;
136
137 int fd = -1;
138 const char* fn = NULL;
139 if (argc == 0) {
140 fd = dup(STDOUT_FILENO);
141 } else if (argc == 1) {
142 fn = argv[0];
143 fd = open(fn, O_WRONLY | O_CREAT | O_TRUNC, 0664);
144 if (fd == -1) {
145 fprintf(stderr, "Error opening file: %s (%s)\n", fn, strerror(errno));
146 return 1;
147 }
148 const int len = strlen(fn);
149 if (len >= 4 && 0 == strcmp(fn+len-4, ".png")) {
150 png = true;
151 }
152 }
153
154 if (fd == -1) {
155 usage(pname);
156 return 1;
157 }
158
159 void const* mapbase = MAP_FAILED;
160 ssize_t mapsize = -1;
161
162 void* base = NULL;
163 uint32_t w, s, h, f;
164 android_dataspace d;
165 size_t size = 0;
166
167 // Maps orientations from DisplayInfo to ISurfaceComposer
168 static const uint32_t ORIENTATION_MAP[] = {
169 ISurfaceComposer::eRotateNone, // 0 == DISPLAY_ORIENTATION_0
170 ISurfaceComposer::eRotate270, // 1 == DISPLAY_ORIENTATION_90
171 ISurfaceComposer::eRotate180, // 2 == DISPLAY_ORIENTATION_180
172 ISurfaceComposer::eRotate90, // 3 == DISPLAY_ORIENTATION_270
173 };
174
175 // setThreadPoolMaxThreadCount(0) actually tells the kernel it's
176 // not allowed to spawn any additional threads, but we still spawn
177 // a binder thread from userspace when we call startThreadPool().
178 // See b/36066697 for rationale
179 ProcessState::self()->setThreadPoolMaxThreadCount(0);
180 ProcessState::self()->startThreadPool();
181
182 sp<IBinder> display = SurfaceComposerClient::getBuiltInDisplay(displayId);
183 if (display == NULL) {
184 fprintf(stderr, "Unable to get handle for display %d\n", displayId);
185 // b/36066697: Avoid running static destructors.
186 _exit(1);
187 }
188
189 Vector<DisplayInfo> configs;
190 SurfaceComposerClient::getDisplayConfigs(display, &configs);
191 int activeConfig = SurfaceComposerClient::getActiveConfig(display);
192 if (static_cast<size_t>(activeConfig) >= configs.size()) {
193 fprintf(stderr, "Active config %d not inside configs (size %zu)\n",
194 activeConfig, configs.size());
195 // b/36066697: Avoid running static destructors.
196 _exit(1);
197 }
198 uint8_t displayOrientation = configs[activeConfig].orientation;
199 uint32_t captureOrientation = ORIENTATION_MAP[displayOrientation];
200
201 sp<GraphicBuffer> outBuffer;
202 status_t result = ScreenshotClient::capture(display, Rect(), 0 /* reqWidth */,
203 0 /* reqHeight */, INT32_MIN, INT32_MAX, /* all layers */ false, captureOrientation,
204 &outBuffer);
205 if (result != NO_ERROR) {
206 close(fd);
207 _exit(1);
208 }
209
210 result = outBuffer->lock(GraphicBuffer::USAGE_SW_READ_OFTEN, &base);
211
212 if (base == NULL) {
213 close(fd);
214 _exit(1);
215 }
216
217 w = outBuffer->getWidth();
218 h = outBuffer->getHeight();
219 s = outBuffer->getStride();
220 f = outBuffer->getPixelFormat();
221 d = HAL_DATASPACE_UNKNOWN;
222 size = s * h * bytesPerPixel(f);
223
224 if (png) {
225 const SkImageInfo info =
226 SkImageInfo::Make(w, h, flinger2skia(f), kPremul_SkAlphaType, dataSpaceToColorSpace(d));
227 SkPixmap pixmap(info, base, s * bytesPerPixel(f));
228 struct FDWStream final : public SkWStream {
229 size_t fBytesWritten = 0;
230 int fFd;
231 FDWStream(int f) : fFd(f) {}
232 size_t bytesWritten() const override { return fBytesWritten; }
233 bool write(const void* buffer, size_t size) override {
234 fBytesWritten += size;
235 return size == 0 || ::write(fFd, buffer, size) > 0;
236 }
237 } fdStream(fd);
238 (void)SkEncodeImage(&fdStream, pixmap, SkEncodedImageFormat::kPNG, 100);
239 if (fn != NULL) {
240 notifyMediaScanner(fn);
241 }
242 } else {
243 uint32_t c = dataSpaceToInt(d);
244 write(fd, &w, 4);
245 write(fd, &h, 4);
246 write(fd, &f, 4);
247 write(fd, &c, 4);
248 size_t Bpp = bytesPerPixel(f);
249 for (size_t y=0 ; y<h ; y++) {
250 write(fd, base, w*Bpp);
251 base = (void *)((char *)base + s*Bpp);
252 }
253 }
254 close(fd);
255 if (mapbase != MAP_FAILED) {
256 munmap((void *)mapbase, mapsize);
257 }
258
259 // b/36066697: Avoid running static destructors.
260 _exit(0);
261 }