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 SkBitmap::Config flinger2skia(PixelFormat f) 56 { 57 switch (f) { 58 case PIXEL_FORMAT_RGB_565: 59 return SkBitmap::kRGB_565_Config; 60 default: 61 return SkBitmap::kARGB_8888_Config; 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) == 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 SkBitmap b; 178 b.setConfig(flinger2skia(f), w, h, s*bytesPerPixel(f)); 179 b.setPixels((void*)base); 180 SkDynamicMemoryWStream stream; 181 SkImageEncoder::EncodeStream(&stream, b, 182 SkImageEncoder::kPNG_Type, SkImageEncoder::kDefaultQuality); 183 SkData* streamData = stream.copyToData(); 184 write(fd, streamData->data(), streamData->size()); 185 streamData->unref(); 186 } else { 187 write(fd, &w, 4); 188 write(fd, &h, 4); 189 write(fd, &f, 4); 190 size_t Bpp = bytesPerPixel(f); 191 for (size_t y=0 ; y<h ; y++) { 192 write(fd, base, w*Bpp); 193 base = (void *)((char *)base + s*Bpp); 194 } 195 } 196 } 197 close(fd); 198 if (mapbase != MAP_FAILED) { 199 munmap((void *)mapbase, mapsize); 200 } 201 return 0; 202 } 203
