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- /*
- * Copyright (C) 2007 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
- #include <stdlib.h>
- #include <stdio.h>
- #include <unistd.h>
- #include <string.h>
- #include <fcntl.h>
- #include <errno.h>
- #include <sys/types.h>
- #include <sys/wait.h>
- #include "fdevent.h"
- #include "adb.h"
- #include <linux/fb.h>
- #include <sys/ioctl.h>
- #include <sys/mman.h>
- /*
- * TEMP_FAILURE_RETRY is defined by some, but not all, versions of
- * <unistd.h>. (Alas, it is not as standard as we'd hoped!) So, if it's
- * not already defined, then define it here.
- */
- #ifndef TEMP_FAILURE_RETRY
- /* Used to retry syscalls that can return EINTR. */
- #define TEMP_FAILURE_RETRY(exp) ({ \
- typeof (exp) _rc; \
- do { \
- _rc = (exp); \
- } while (_rc == -1 && errno == EINTR); \
- _rc; })
- #endif
- /* TODO:
- ** - sync with vsync to avoid tearing
- */
- /* This version number defines the format of the fbinfo struct.
- It must match versioning in ddms where this data is consumed. */
- #define DDMS_RAWIMAGE_VERSION 1
- struct fbinfo {
- unsigned int version;
- unsigned int bpp;
- unsigned int size;
- unsigned int width;
- unsigned int height;
- unsigned int red_offset;
- unsigned int red_length;
- unsigned int blue_offset;
- unsigned int blue_length;
- unsigned int green_offset;
- unsigned int green_length;
- unsigned int alpha_offset;
- unsigned int alpha_length;
- } __attribute__((packed));
- void framebuffer_service(int fd, void *cookie)
- {
- struct fbinfo fbinfo;
- unsigned int i;
- char buf[1024];
- int fd_screencap;
- int w, h, f;
- int fds[2];
- if (pipe(fds) < 0) goto done;
- pid_t pid = fork();
- if (pid < 0) goto done;
- if (pid == 0) {
- dup2(fds[1], STDOUT_FILENO);
- close(fds[0]);
- close(fds[1]);
- const char* command = "screencap";
- const char *args[2] = {command, NULL};
- execvp(command, (char**)args);
- exit(1);
- }
- fd_screencap = fds[0];
- /* read w, h & format */
- if(readx(fd_screencap, &w, 4)) goto done;
- if(readx(fd_screencap, &h, 4)) goto done;
- if(readx(fd_screencap, &f, 4)) goto done;
- fbinfo.version = DDMS_RAWIMAGE_VERSION;
- /* see hardware/hardware.h */
- switch (f) {
- case 1: /* RGBA_8888 */
- fbinfo.bpp = 32;
- fbinfo.size = w * h * 4;
- fbinfo.width = w;
- fbinfo.height = h;
- fbinfo.red_offset = 0;
- fbinfo.red_length = 8;
- fbinfo.green_offset = 8;
- fbinfo.green_length = 8;
- fbinfo.blue_offset = 16;
- fbinfo.blue_length = 8;
- fbinfo.alpha_offset = 24;
- fbinfo.alpha_length = 8;
- break;
- case 2: /* RGBX_8888 */
- fbinfo.bpp = 32;
- fbinfo.size = w * h * 4;
- fbinfo.width = w;
- fbinfo.height = h;
- fbinfo.red_offset = 0;
- fbinfo.red_length = 8;
- fbinfo.green_offset = 8;
- fbinfo.green_length = 8;
- fbinfo.blue_offset = 16;
- fbinfo.blue_length = 8;
- fbinfo.alpha_offset = 24;
- fbinfo.alpha_length = 0;
- break;
- case 3: /* RGB_888 */
- fbinfo.bpp = 24;
- fbinfo.size = w * h * 3;
- fbinfo.width = w;
- fbinfo.height = h;
- fbinfo.red_offset = 0;
- fbinfo.red_length = 8;
- fbinfo.green_offset = 8;
- fbinfo.green_length = 8;
- fbinfo.blue_offset = 16;
- fbinfo.blue_length = 8;
- fbinfo.alpha_offset = 24;
- fbinfo.alpha_length = 0;
- break;
- case 4: /* RGB_565 */
- fbinfo.bpp = 16;
- fbinfo.size = w * h * 2;
- fbinfo.width = w;
- fbinfo.height = h;
- fbinfo.red_offset = 11;
- fbinfo.red_length = 5;
- fbinfo.green_offset = 5;
- fbinfo.green_length = 6;
- fbinfo.blue_offset = 0;
- fbinfo.blue_length = 5;
- fbinfo.alpha_offset = 0;
- fbinfo.alpha_length = 0;
- break;
- case 5: /* BGRA_8888 */
- fbinfo.bpp = 32;
- fbinfo.size = w * h * 4;
- fbinfo.width = w;
- fbinfo.height = h;
- fbinfo.red_offset = 16;
- fbinfo.red_length = 8;
- fbinfo.green_offset = 8;
- fbinfo.green_length = 8;
- fbinfo.blue_offset = 0;
- fbinfo.blue_length = 8;
- fbinfo.alpha_offset = 24;
- fbinfo.alpha_length = 8;
- break;
- default:
- goto done;
- }
- /* write header */
- if(writex(fd, &fbinfo, sizeof(fbinfo))) goto done;
- /* write data */
- for(i = 0; i < fbinfo.size; i += sizeof(buf)) {
- if(readx(fd_screencap, buf, sizeof(buf))) goto done;
- if(writex(fd, buf, sizeof(buf))) goto done;
- }
- if(readx(fd_screencap, buf, fbinfo.size % sizeof(buf))) goto done;
- if(writex(fd, buf, fbinfo.size % sizeof(buf))) goto done;
- done:
- TEMP_FAILURE_RETRY(waitpid(pid, NULL, 0));
- close(fds[0]);
- close(fds[1]);
- close(fd);
- }
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