diff options
Diffstat (limited to 'src/vmon.c')
| -rw-r--r-- | src/vmon.c | 122 |
1 files changed, 122 insertions, 0 deletions
@@ -19,11 +19,14 @@ #include <X11/Xlib.h> #include <assert.h> #include <limits.h> +#include <png.h> #include <poll.h> #include <signal.h> +#include <stdio.h> #include <stdlib.h> #include <sys/prctl.h> #include <time.h> +#include <sys/stat.h> #include <sys/types.h> #include <sys/wait.h> #include <unistd.h> @@ -47,7 +50,9 @@ typedef struct vmon_t { int done; int linger; time_t start_time; + int snapshot; char *output_dir; + unsigned n_snapshots; } vmon_t; @@ -186,6 +191,7 @@ static void print_help(void) " -y --height Window height\n" " -z --hertz Sample rate in hertz\n" " -o --output-dir Directory to store saved output to (\".\" if unspecified)\n" + " -s --snapshot Save a PNG snapshot upon receiving SIGCHLD\n" "-----------------------------------------------------------------------------" ); } @@ -248,6 +254,9 @@ static int vmon_handle_argv(vmon_t *vmon, int argc, char * const argv[]) return 0; last = ++argv; + } else if (is_flag(*argv, "-s", "--snapshot")) { + vmon->snapshot = 1; + last = argv; } else if (is_flag(*argv, "-f", "--fullscreen")) { if (!set_fullscreen(vmon)) { VWM_ERROR("unable to set fullscreen dimensions"); @@ -425,6 +434,116 @@ static void vmon_resize(vmon_t *vmon, int width, int height) } +static int vmon_snapshot_as_png(vmon_t *vmon, FILE *output) +{ + XImage *chart_as_ximage; + png_bytepp row_pointers; + png_infop info_ctx; + png_structp png_ctx; + + assert(vmon); + assert(output); + + vwm_chart_render_as_ximage(vmon->charts, vmon->chart, NULL, &chart_as_ximage); + + row_pointers = malloc(sizeof(void *) * chart_as_ximage->height); + if (!row_pointers) { + XDestroyImage(chart_as_ximage); + + return -ENOMEM; + } + + for (unsigned i = 0; i < chart_as_ximage->height; i++) + row_pointers[i] = &((png_byte *)chart_as_ximage->data)[i * chart_as_ximage->bytes_per_line]; + + png_ctx = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); + if (!png_ctx) { + free(row_pointers); + XDestroyImage(chart_as_ximage); + + return -ENOMEM; + } + + info_ctx = png_create_info_struct(png_ctx); + if (!info_ctx) { + png_destroy_write_struct(&png_ctx, NULL); + XDestroyImage(chart_as_ximage); + free(row_pointers); + + return -ENOMEM; + } + + png_init_io(png_ctx, output); + + if (setjmp(png_jmpbuf(png_ctx)) != 0) { + png_destroy_write_struct(&png_ctx, &info_ctx); + XDestroyImage(chart_as_ximage); + free(row_pointers); + + return -ENOMEM; + } + + /* XXX: I'm sure this is making flawed assumptions about the color format + * and type etc, but this makes it work for me and that's Good Enough for now. + * One can easily turn runtime mapping of X color formats, endianness, and packing + * details to whatever a file format like PNG can express into a tar-filled rabbithole + * of fruitless wankery. + */ + png_set_bgr(png_ctx); + png_set_IHDR(png_ctx, info_ctx, + chart_as_ximage->width, + chart_as_ximage->height, + 8, + PNG_COLOR_TYPE_RGBA, + PNG_INTERLACE_NONE, + PNG_COMPRESSION_TYPE_BASE, + PNG_FILTER_TYPE_BASE); + + png_write_info(png_ctx, info_ctx); + png_write_image(png_ctx, row_pointers); + png_write_end(png_ctx, NULL); + + XDestroyImage(chart_as_ximage); + free(row_pointers); + + return 0; +} + + +static int vmon_snapshot(vmon_t *vmon) +{ + struct tm *start_time; + char start_str[32]; + char path[4096]; + FILE *output; + int r; + + assert(vmon); + + if (mkdir(vmon->output_dir, 0755) == -1 && errno != EEXIST) + return -errno; + + start_time = localtime(&vmon->start_time); + strftime(start_str, sizeof(start_str), "%m.%d.%y-%T", start_time); + snprintf(path, sizeof(path), "%s/%s-%u.png", vmon->output_dir, start_str, vmon->n_snapshots++); + + output = fopen(path, "w+"); + if (!output) + return -errno; + + r = vmon_snapshot_as_png(vmon, output); + if (r < 0) { + fclose(output); + return r; + } + + fsync(fileno(output)); + fclose(output); + + return 0; +} + + /* handle the next X event, may block */ static void vmon_process_event(vmon_t *vmon) { @@ -489,6 +608,9 @@ int main(int argc, char * const argv[]) if (got_sigchld) { int status; + if (vmon_snapshot(vmon) < 0) + VWM_ERROR("error saving snapshot"); + got_sigchld = 0; wait(&status); |