Add app that can read log fileslog-drawing

1 files changed, 184 insertions, 0 deletions

diff --git a/log_reader.c b/log_reader.c
new file mode 100644
index 0000000..d9188dc
--- /dev/null
+++ b/log_reader.c
@@ -0,0 +1,184 @@
+/* Build with:
+   gcc `pkg-config --libs --cflags gtk+-2.0 pixman-1` log_reader.c -o log_reader -Wall -O2
+*/
+
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <pixman.h>
+#include <gdk/gdkkeysyms.h>
+
+#include <gtk/gtk.h>
+
+struct __attribute__ ((__packed__)) DrawLogEntry {
+    uint32_t text_length;
+    uint32_t surface_id;
+    uint32_t width;
+    uint32_t height;
+    uint32_t stride;
+    uint32_t format;
+    uint32_t box_x;
+    uint32_t box_y;
+    uint32_t box_w;
+    uint32_t box_h;
+    /* text */
+    /* canvas data */
+};
+
+int fd;
+GtkWidget *label, *image;
+off_t frame_pos[1024];
+int frame = 0;
+struct DrawLogEntry current_entry;
+int after = TRUE;
+char *current_text = NULL;
+GdkPixbuf *pixbuf1 = NULL, *pixbuf2 = NULL;
+
+static GdkPixbuf * get_pixbuf(struct DrawLogEntry *entry, const char *data)
+{
+  pixman_image_t *src, *dest;
+  GdkPixbuf *pixbuf;
+
+  src = pixman_image_create_bits (entry->format,
+				  entry->width,
+				  entry->height,
+				  (guint32 *)data,
+				  entry->stride);
+
+  pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, entry->width, entry->height);
+  dest = pixman_image_create_bits (PIXMAN_b8g8r8,
+				   entry->width,
+				   entry->height,
+				   (guint32 *)gdk_pixbuf_get_pixels (pixbuf),
+				   gdk_pixbuf_get_rowstride (pixbuf));
+
+  pixman_image_composite32 (PIXMAN_OP_SRC, src, NULL, dest,
+			    0, 0, 0,0, 0,0, entry->width, entry->height);
+
+  pixman_image_unref (src);
+  pixman_image_unref (dest);
+
+  return pixbuf;
+}
+
+static void update_text(void)
+{
+  char *l;
+  l = g_strdup_printf("%d %s: %d - %s", frame-1, after?"after":"before", current_entry.surface_id, current_text);
+  gtk_label_set_text (GTK_LABEL (label), l);
+  g_free(l);
+}
+
+static void update_image(void)
+{
+  if (after)
+    gtk_image_set_from_pixbuf (GTK_IMAGE (image), pixbuf2);
+  else
+    gtk_image_set_from_pixbuf (GTK_IMAGE (image), pixbuf1);
+}
+
+void read_next(void)
+{
+  char *data;
+  ssize_t n;
+
+  frame_pos[frame] = lseek(fd, 0, SEEK_CUR);
+
+  n = read(fd, &current_entry, sizeof(current_entry));
+  if (n == 0) {
+    return;
+  }
+  frame ++;
+
+  if (pixbuf1)
+    g_object_unref(pixbuf1);
+  if (pixbuf2)
+    g_object_unref(pixbuf2);
+
+  g_free(current_text);
+  current_text = g_malloc(current_entry.text_length + 1);
+  read(fd, current_text, current_entry.text_length);
+  current_text[current_entry.text_length] = 0;
+
+  data = g_malloc(current_entry.stride * current_entry.height);
+  read(fd, data, current_entry.stride * current_entry.height);
+
+  pixbuf1 = get_pixbuf(&current_entry, data);
+
+  data = g_malloc(current_entry.stride * current_entry.height);
+  read(fd, data, current_entry.stride * current_entry.height);
+
+  pixbuf2 = get_pixbuf(&current_entry, data);
+
+  update_text();
+  update_image();
+}
+
+void read_prev(void)
+{
+  if (frame < 2)
+    return; /* no earlier */
+
+  frame -= 2;
+  lseek(fd, frame_pos[frame], SEEK_SET);
+  read_next();
+}
+
+gboolean key_pressed (GtkWidget	     *widget,
+		      GdkEventKey    *event)
+{
+  if (event->keyval == GDK_Right) {
+    read_next();
+  } else if (event->keyval == GDK_Left) {
+    read_prev();
+  } else if (event->keyval == GDK_Up) {
+    after = TRUE;
+    update_text();
+    update_image();
+  } else if (event->keyval == GDK_Down) {
+    after = FALSE;
+    update_text();
+    update_image();
+  }
+  return TRUE;
+}
+
+int
+main(int argc, char *argv[])
+{
+  GtkWidget *window, *vbox;
+
+  gtk_init(&argc, &argv);
+
+  fd = open(argv[1], O_RDONLY);
+
+  if (fd == -1) {
+    printf ("Can't open %s\n", argv[1]);
+  }
+
+  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+
+  g_signal_connect (window, "key_press_event", G_CALLBACK (key_pressed), NULL);
+
+  vbox = gtk_vbox_new (FALSE, 4);
+  gtk_container_add (GTK_CONTAINER(window), vbox);
+  label = gtk_label_new ("Log entry");
+  gtk_label_set_justify (GTK_LABEL(label), GTK_JUSTIFY_LEFT);
+  gtk_misc_set_alignment (GTK_MISC(label), 0.0, 0.0);
+
+  gtk_box_pack_start (GTK_BOX (vbox),
+		      label, FALSE, FALSE, 0);
+  image = gtk_image_new ();
+  gtk_box_pack_start (GTK_BOX (vbox),
+		      image, FALSE, FALSE, 0);
+
+  gtk_widget_show_all (window);
+
+  read_next();
+
+  gtk_main();
+
+  return 0;
+}