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-rw-r--r--util/cairo-fdr/fdr.c304
1 files changed, 304 insertions, 0 deletions
diff --git a/util/cairo-fdr/fdr.c b/util/cairo-fdr/fdr.c
new file mode 100644
index 0000000..9890024
--- /dev/null
+++ b/util/cairo-fdr/fdr.c
@@ -0,0 +1,304 @@
+/* cairo-fdr - a 'flight data recorder', a black box, for cairo
+ *
+ * Copyright © 2009 Chris Wilson
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#define _GNU_SOURCE
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <cairo.h>
+#include <cairo-script.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <signal.h>
+
+#include <dlfcn.h>
+
+static void *_dlhandle = RTLD_NEXT;
+#define DLCALL(name, args...) ({ \
+ static typeof (&name) name##_real; \
+ if (name##_real == NULL) { \
+ name##_real = dlsym (_dlhandle, #name); \
+ if (name##_real == NULL && _dlhandle == RTLD_NEXT) { \
+ _dlhandle = dlopen ("libcairo.so", RTLD_LAZY); \
+ name##_real = dlsym (_dlhandle, #name); \
+ assert (name##_real != NULL); \
+ } \
+ } \
+ (*name##_real) (args); \
+})
+
+#define RINGBUFFER_SIZE 16
+static cairo_surface_t *fdr_ringbuffer[RINGBUFFER_SIZE];
+static int fdr_position;
+static int fdr_dump;
+
+static const cairo_user_data_key_t fdr_key;
+
+static void
+fdr_replay_to_script (cairo_surface_t *meta, cairo_script_context_t *ctx)
+{
+ if (meta != NULL) {
+ DLCALL (cairo_script_context_write_comment, ctx, "--- fdr ---", -1);
+ DLCALL (cairo_script_from_meta_surface, ctx, meta);
+ }
+}
+
+static void
+fdr_dump_ringbuffer (void)
+{
+ cairo_script_context_t *ctx;
+ int n;
+
+ ctx = DLCALL (cairo_script_context_create, "/tmp/fdr.trace");
+
+ for (n = fdr_position; n < RINGBUFFER_SIZE; n++)
+ fdr_replay_to_script (fdr_ringbuffer[n], ctx);
+
+ for (n = 0; n < fdr_position; n++)
+ fdr_replay_to_script (fdr_ringbuffer[n], ctx);
+
+ DLCALL (cairo_script_context_destroy, ctx);
+}
+
+static void
+fdr_sighandler (int sig)
+{
+ fdr_dump = 1;
+}
+
+static void
+fdr_atexit (void)
+{
+ if (fdr_dump)
+ fdr_dump_ringbuffer ();
+}
+
+static void
+fdr_pending_signals (void)
+{
+ static int initialized;
+
+ if (! initialized) {
+ initialized = 1;
+
+ signal (SIGUSR1, fdr_sighandler);
+ atexit (fdr_atexit);
+ }
+
+ if (fdr_dump) {
+ fdr_dump_ringbuffer ();
+ fdr_dump = 0;
+ }
+}
+
+static void
+fdr_get_extents (cairo_surface_t *surface,
+ cairo_rectangle_t *extents)
+{
+ cairo_t *cr;
+
+ cr = DLCALL (cairo_create, surface);
+ DLCALL (cairo_clip_extents, cr,
+ &extents->x, &extents->y, &extents->width, &extents->height);
+ DLCALL (cairo_destroy, cr);
+
+ extents->width -= extents->x;
+ extents->height -= extents->y;
+}
+
+static void
+fdr_surface_destroy (void *surface)
+{
+ DLCALL (cairo_surface_destroy, surface);
+}
+
+static void
+fdr_surface_reference (void *surface)
+{
+ DLCALL (cairo_surface_reference, surface);
+}
+
+static cairo_surface_t *
+fdr_surface_get_tee (cairo_surface_t *surface)
+{
+ return DLCALL (cairo_surface_get_user_data, surface, &fdr_key);
+}
+
+static cairo_surface_t *
+fdr_tee_surface_index (cairo_surface_t *surface, int index)
+{
+ return DLCALL (cairo_tee_surface_index, surface, index);
+}
+
+cairo_t *
+cairo_create (cairo_surface_t *surface)
+{
+ cairo_surface_t *record, *tee;
+
+ fdr_pending_signals ();
+
+ tee = fdr_surface_get_tee (surface);
+ if (tee == NULL) {
+ cairo_rectangle_t extents;
+ cairo_content_t content;
+
+ fdr_get_extents (surface, &extents);
+ content = DLCALL (cairo_surface_get_content, surface);
+
+ tee = DLCALL (cairo_tee_surface_create, surface);
+ record = DLCALL (cairo_meta_surface_create, content, &extents);
+ DLCALL (cairo_tee_surface_add, tee, record);
+
+ DLCALL (cairo_surface_set_user_data, surface,
+ &fdr_key, tee, fdr_surface_destroy);
+ } else {
+ int n;
+
+ record = fdr_tee_surface_index (tee, 1);
+
+ /* update the position of the recording surface in the ringbuffer */
+ for (n = 0; n < RINGBUFFER_SIZE; n++) {
+ if (record == fdr_ringbuffer[n]) {
+ fdr_ringbuffer[n] = NULL;
+ break;
+ }
+ }
+ }
+
+ fdr_surface_destroy (fdr_ringbuffer[fdr_position]);
+ fdr_ringbuffer[fdr_position] = record;
+ fdr_position = (fdr_position + 1) % RINGBUFFER_SIZE;
+
+ return DLCALL (cairo_create, tee);
+}
+
+static void
+fdr_remove_tee (cairo_surface_t *surface)
+{
+ fdr_surface_reference (surface);
+ DLCALL (cairo_surface_set_user_data, surface, &fdr_key, NULL, NULL);
+ fdr_surface_destroy (surface);
+}
+
+void
+cairo_destroy (cairo_t *cr)
+{
+ cairo_surface_t *tee;
+
+ tee = DLCALL (cairo_get_target, cr);
+ DLCALL (cairo_destroy, cr);
+
+ if (DLCALL (cairo_surface_get_reference_count, tee) == 1)
+ fdr_remove_tee (fdr_tee_surface_index (tee, 0));
+}
+
+void
+cairo_pattern_destroy (cairo_pattern_t *pattern)
+{
+ if (DLCALL (cairo_pattern_get_type, pattern) == CAIRO_PATTERN_TYPE_SURFACE) {
+ cairo_surface_t *surface;
+
+ if (DLCALL (cairo_pattern_get_surface, pattern, &surface) == CAIRO_STATUS_SUCCESS &&
+ DLCALL (cairo_surface_get_type, surface) == CAIRO_SURFACE_TYPE_TEE &&
+ DLCALL (cairo_surface_get_reference_count, surface) == 2)
+ {
+ fdr_remove_tee (fdr_tee_surface_index (surface, 0));
+ }
+ }
+
+ DLCALL (cairo_pattern_destroy, pattern);
+}
+
+cairo_surface_t *
+cairo_get_target (cairo_t *cr)
+{
+ cairo_surface_t *tee;
+
+ tee = DLCALL (cairo_get_target, cr);
+ return fdr_tee_surface_index (tee, 0);
+}
+
+cairo_surface_t *
+cairo_get_group_target (cairo_t *cr)
+{
+ cairo_surface_t *tee;
+
+ tee = DLCALL (cairo_get_group_target, cr);
+ return fdr_tee_surface_index (tee, 0);
+}
+
+cairo_pattern_t *
+cairo_pattern_create_for_surface (cairo_surface_t *surface)
+{
+ cairo_surface_t *tee;
+
+ tee = fdr_surface_get_tee (surface);
+ if (tee != NULL)
+ surface = tee;
+
+ return DLCALL (cairo_pattern_create_for_surface, surface);
+}
+
+cairo_status_t
+cairo_pattern_get_surface (cairo_pattern_t *pattern,
+ cairo_surface_t **surface)
+{
+ cairo_status_t status;
+ cairo_surface_t *tee;
+
+ status = DLCALL (cairo_pattern_get_surface, pattern, surface);
+ if (status != CAIRO_STATUS_SUCCESS)
+ return status;
+
+ tee = fdr_surface_get_tee (*surface);
+ if (tee != NULL)
+ *surface = tee;
+
+ return CAIRO_STATUS_SUCCESS;
+}
+
+void
+cairo_set_source_surface (cairo_t *cr,
+ cairo_surface_t *surface,
+ double x, double y)
+{
+ cairo_surface_t *tee;
+
+ tee = fdr_surface_get_tee (surface);
+ if (tee != NULL)
+ surface = tee;
+
+ DLCALL (cairo_set_source_surface, cr, surface, x, y);
+}
+
+cairo_surface_t *
+cairo_surface_create_similar (cairo_surface_t *surface,
+ cairo_content_t content,
+ int width, int height)
+{
+ cairo_surface_t *tee;
+
+ tee = fdr_surface_get_tee (surface);
+ if (tee != NULL)
+ surface = tee;
+
+ return DLCALL (cairo_surface_create_similar,
+ surface, content, width, height);
+}
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