diff options
Diffstat (limited to 'src/scrotty.c')
| -rw-r--r-- | src/scrotty.c | 81 |
1 files changed, 57 insertions, 24 deletions
diff --git a/src/scrotty.c b/src/scrotty.c index 850e448..d62abb1 100644 --- a/src/scrotty.c +++ b/src/scrotty.c @@ -66,33 +66,22 @@ static const char* inttable[] = * * @param fbname The framebuffer device * @param fbno The number of the framebuffer + * @param width The width of the image + * @param height The height of the image * @param fd The file descriptor connected to `convert`'s stdin * @return Zero on success, -1 on error */ -static int save_pnm(const char* fbpath, int fbno, int fd) +static int save_pnm(const char* fbpath, int fbno, long width, long height, int fd) { char buf[PATH_MAX]; FILE* file; - int saved_errno, sizefd, fbfd, r, g, b; + int saved_errno, fbfd, r, g, b; ssize_t got, off; - /* Open the file with the framebuffer's dimensions. */ - sprintf(buf, SYSDIR "/class/graphics/fb%i/virtual_size", fbno); - if (sizefd = open(buf, O_RDONLY), sizefd < 0) - return -1; - - /* Get the dimensions of the framebuffer. */ - if (got = read(sizefd, buf, sizeof(buf) / sizeof(char) - 1), got < 0) - return saved_errno = errno, close(sizefd), errno = saved_errno, -1; - close(sizefd); - /* The read content is formated as `%{1},%{2}\n`, we want it do be `%{1} %{2}\n\0`. */ - buf[got] = '\0'; - *strchr(buf, ',') = ' '; - /* Open the framebuffer device for reading. */ if (fbfd = open(fbpath, O_RDONLY), fbfd < 0) return -1; - + /* Create a FILE*, for writing, for the image file. */ file = fdopen(fd, "w"); if (file == NULL) @@ -100,7 +89,7 @@ static int save_pnm(const char* fbpath, int fbno, int fd) /* The PNM image should begin with `P3\n%{width} %{height}\n%{colour max=255}\n`. ('\n' and ' ' can be exchanged at will.) */ - fprintf(file, "P3\n%s255\n", buf); + fprintf(file, "P3\n%l %l255\n", width, height); /* Convert raw framebuffer data into an PNM image. */ for (off = 0;;) @@ -149,10 +138,12 @@ static int save_pnm(const char* fbpath, int fbno, int fd) * @param fbname The framebuffer device * @param imgname The pathname of the output image * @param fbno The number of the framebuffer + * @param width The width of the image + * @param height The height of the image * @param execname `argv[0]` from `main` * @return Zero on success, -1 on error */ -static int save(const char* fbpath, const char* imgpath, int fbno, const char* execname) +static int save(const char* fbpath, const char* imgpath, int fbno, long width, long height, const char* execname) { int pipe_rw[2]; pid_t pid, reaped; @@ -161,11 +152,11 @@ static int save(const char* fbpath, const char* imgpath, int fbno, const char* e /* Create a pipe that for sending data into the `convert` program. */ if (pipe(pipe_rw) < 0) return -1; - + /* Fork the process, the child will exec. `convert`. */ if (pid = fork(), pid == -1) return saved_errno = errno, close(pipe_rw[0]), close(pipe_rw[1]), errno = saved_errno, -1; - + /* Child process: */ if (pid == 0) { @@ -190,23 +181,60 @@ static int save(const char* fbpath, const char* imgpath, int fbno, const char* e close(pipe_rw[0]); /* Create a PNM-image of the framebuffer. */ - if (save_pnm(fbpath, fbno, pipe_rw[1]) < 0) + if (save_pnm(fbpath, fbno, width, height, pipe_rw[1]) < 0) return saved_errno = errno, close(pipe_rw[1]), errno = saved_errno, -1; /* Close the write-end of the pipe. */ close(pipe_rw[1]); - + /* Wait for `convert` to exit. */ for (reaped = 0; reaped != pid;) if (reaped = waitpid(pid, &status, 0), reaped < 0) return -1; - + /* Return successfully if and only if `convert` did. */ return status == 0 ? 0 : -1; } /** + * Get the dimensions of the framebuffer + * + * @param fbno The number of the framebuffer + * @param width Output parameter for the width of the image + * @param height Output parameter for the height of the image + * @return Zero on success, -1 on error + */ +static int measure(int fbno, long* width, long* height) +{ + char buf[PATH_MAX]; + char* delim; + int sizefd, saved_errno; + ssize_t got; + + /* Open the file with the framebuffer's dimensions. */ + sprintf(buf, SYSDIR "/class/graphics/fb%i/virtual_size", fbno); + if (sizefd = open(buf, O_RDONLY), sizefd < 0) + return -1; + + /* Get the dimensions of the framebuffer. */ + if (got = read(sizefd, buf, sizeof(buf) / sizeof(char) - 1), got < 0) + return saved_errno = errno, close(sizefd), errno = saved_errno, -1; + close(sizefd); + + /* The read content is formated as `%{width},%{height}\n`, + convert it to `%{width}\0%{height}\0` and parse it. */ + buf[got] = '\0'; + delim = strchr(buf, ','); + *delim++ = '\0'; + *width = atol(buf); + *height = atol(delim); + + return 0; +} + + +/** * Take a screenshow of all framebuffers * * @param argc The number of elements in `argv` @@ -218,6 +246,7 @@ int main(int argc, char* argv[]) char fbpath[PATH_MAX]; char imgpath[PATH_MAX]; int i, fbno; + long width, height; (void) argc; @@ -229,6 +258,10 @@ int main(int argc, char* argv[]) if (access(fbpath, F_OK)) break; + /* Get the size of the framebuffer. */ + if (measure(fbno, &width, &height) < 0) + return perror(*argv), 1; + /* Get output pathname. */ sprintf(imgpath, "fb%i.png", fbno); if (access(imgpath, F_OK) == 0) @@ -240,7 +273,7 @@ int main(int argc, char* argv[]) } /* Take a screenshot of the current framebuffer. */ - if (save(fbpath, imgpath, fbno, *argv) < 0) + if (save(fbpath, imgpath, fbno, width, height, *argv) < 0) return perror(*argv), 1; fprintf(stderr, "Saved framebuffer %i to %s\n", fbno, imgpath); } |