mirror of
https://gitlab.freedesktop.org/cairo/cairo.git
synced 2026-05-05 15:48:00 +02:00
trace: Fix operand emission
Recent updates (in the past couple of years) to firefox have exposed numerous bugs in the way we emit the operands. A few off-by-ones, missing surfaces and outright bugs all of which are intermixed into producing a corrupt stack. Reported-by: Siarhei Siamashka <siarhei.siamashka@gmail.com> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson
parent
0c2faf6621
commit
c1ac8db7e6
1 changed files with 181 additions and 49 deletions
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@ -60,6 +60,8 @@
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#define CAIRO_TRACE_OUTDIR "."
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#endif
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#define DEBUG_STACK 0
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#if HAVE_BYTESWAP_H
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# include <byteswap.h>
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#endif
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@ -424,6 +426,7 @@ _object_create (Type *type, const void *ptr)
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int bucket = BUCKET (type->objects, ptr);
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obj = malloc (sizeof (Object));
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obj->unknown = TRUE;
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obj->defined = FALSE;
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obj->foreign = FALSE;
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obj->operand = -1;
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@ -919,11 +922,31 @@ _get_object (enum operand_type op_type, const void *ptr)
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static Object *current_object[2048]; /* XXX limit operand stack */
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static int current_stack_depth;
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static void
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dump_stack(const char *func)
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{
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#if DEBUG_STACK
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int n;
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_trace_printf ("%% %s: stack[%d] = [", func, current_stack_depth);
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fflush (logfile);
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for (n = 0; n < current_stack_depth; n++) {
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Object *obj = current_object[n];
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assert(obj && obj->type);
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_trace_printf (" %s%s%ld",
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obj->defined ? "" : "*",
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obj->type->op_code, obj->token);
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fflush (logfile);
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}
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_trace_printf (" ]\n");
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fflush (logfile);
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#endif
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}
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static void
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ensure_operands (int num_operands)
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{
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if (current_stack_depth < num_operands)
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{
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if (current_stack_depth < num_operands) {
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int n;
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fprintf (stderr, "Operand stack underflow!\n");
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@ -971,26 +994,36 @@ _exch_operands (void)
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static cairo_bool_t
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_pop_operands_to_depth (int depth)
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{
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while (current_stack_depth > depth) {
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if (depth < 0)
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return FALSE;
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assert(current_stack_depth >= depth);
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if (current_stack_depth == depth)
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return TRUE;
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while (current_stack_depth > depth + 1) {
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Object *c_obj;
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ensure_operands (1);
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c_obj = current_object[--current_stack_depth];
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c_obj->operand = -1;
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if (! c_obj->defined) {
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if (c_obj->unknown)
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return FALSE;
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_trace_printf ("/%s%ld exch def\n",
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c_obj->type->op_code,
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c_obj->token);
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c_obj->defined = TRUE;
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} else {
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_trace_printf ("pop %% %s%ld\n",
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c_obj->type->op_code, c_obj->token);
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assert(c_obj);
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assert(c_obj->type);
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if (! c_obj->defined) {
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current_stack_depth++;
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return FALSE;
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}
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_trace_printf ("pop %% %s%ld\n",
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c_obj->type->op_code, c_obj->token);
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c_obj->operand = -1;
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}
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_exch_operands ();
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_trace_printf ("exch\n");
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dump_stack(__func__);
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return TRUE;
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}
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@ -1012,7 +1045,7 @@ _pop_operands_to_object (Object *obj)
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return TRUE;
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}
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return _pop_operands_to_depth (obj->operand + 2);
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return _pop_operands_to_depth (obj->operand + 1);
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}
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static cairo_bool_t
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@ -1038,9 +1071,9 @@ _is_current (enum operand_type type, const void *ptr, int depth)
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static void
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_push_object(Object *obj)
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{
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assert(obj->operand == -1);
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if (current_stack_depth == ARRAY_LENGTH (current_object))
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{
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if (current_stack_depth == ARRAY_LENGTH (current_object)) {
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int n;
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fprintf (stderr, "Operand stack overflow!\n");
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@ -1088,7 +1121,10 @@ _object_remove (Object *obj)
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current_object[n]->operand = n;
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}
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}
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obj->operand = -1;
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current_stack_depth--;
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dump_stack(__func__);
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}
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}
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@ -1218,7 +1254,7 @@ _emit_pattern_id (cairo_pattern_t *pattern)
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_trace_printf ("p%ld ", obj->token);
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} else {
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_trace_printf ("%d index ",
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current_stack_depth - obj->operand - 1);
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current_stack_depth - obj->operand - 1);
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}
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}
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}
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@ -1894,22 +1930,26 @@ static void
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_emit_current (Object *obj)
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{
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if (obj != NULL && ! _pop_operands_to_object (obj)) {
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if (obj->defined) {
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_trace_printf ("%s%ld\n", obj->type->op_code, obj->token);
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} else {
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if (obj->operand != -1) {
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int n;
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_trace_printf ("%d -1 roll %% %s%ld\n",
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current_stack_depth - obj->operand + 1,
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current_stack_depth - obj->operand,
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obj->type->op_code, obj->token);
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for (n = obj->operand; n < current_stack_depth - 1; n++) {
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current_object[n] = current_object[n+1];
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current_object[n]->operand = n;
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}
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obj->operand = -1;
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current_stack_depth--;
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} else {
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assert(obj->defined);
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_trace_printf ("%s%ld\n", obj->type->op_code, obj->token);
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}
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_push_object (obj);
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dump_stack(__func__);
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}
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}
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@ -1974,6 +2014,7 @@ cairo_create (cairo_surface_t *target)
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}
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_trace_printf ("context %% c%ld\n", context_id);
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_push_operand (CONTEXT, ret);
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dump_stack(__func__);
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}
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_write_unlock ();
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}
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@ -2045,6 +2086,7 @@ cairo_pop_group (cairo_t *cr)
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_emit_line_info ();
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_emit_cairo_op (cr, "pop-group %% p%ld\n", _create_pattern_id (ret));
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_push_operand (PATTERN, ret);
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dump_stack(__func__);
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_exit_trace ();
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return ret;
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@ -2270,7 +2312,7 @@ cairo_set_source (cairo_t *cr, cairo_pattern_t *source)
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_emit_pattern_id (source);
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}
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_trace_printf ("set-source\n");
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_trace_printf ("set-source %% p%ld\n", obj->token);
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_write_unlock ();
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}
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@ -2924,6 +2966,7 @@ cairo_get_font_face (cairo_t *cr)
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_emit_cairo_op (cr, "/font-face get %% f%ld\n", font_face_id);
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_push_operand (FONT_FACE, ret);
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dump_stack(__func__);
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_exit_trace ();
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return ret;
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@ -3136,6 +3179,7 @@ cairo_set_scaled_font (cairo_t *cr, const cairo_scaled_font_t *scaled_font)
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}
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_trace_printf ("set-scaled-font\n");
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_write_unlock ();
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}
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DLCALL (cairo_set_scaled_font, cr, scaled_font);
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@ -3179,6 +3223,12 @@ cairo_scaled_font_create (cairo_font_face_t *font_face,
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options != NULL
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&& _write_lock ())
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{
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Object *obj;
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obj = _type_object_create (SCALED_FONT, ret);
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DLCALL (cairo_scaled_font_set_user_data,
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ret, &destroy_key, obj, _object_undef);
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if (_pop_operands_to (FONT_FACE, font_face))
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_consume_operand (false);
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else
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@ -3192,10 +3242,9 @@ cairo_scaled_font_create (cairo_font_face_t *font_face,
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_emit_font_options (options);
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_trace_printf (" scaled-font dup /sf%ld exch def\n",
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_create_scaled_font_id (ret));
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_push_operand (SCALED_FONT, ret);
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_get_object (SCALED_FONT, ret)->defined = TRUE;
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_trace_printf (" scaled-font /sf%ld exch def\n",
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obj->token);
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obj->defined = TRUE;
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_write_unlock ();
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}
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@ -3493,6 +3542,7 @@ cairo_image_surface_create (cairo_format_t format, int width, int height)
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obj->height = height;
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obj->defined = TRUE;
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_push_object (obj);
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dump_stack(__func__);
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_write_unlock ();
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}
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@ -3543,6 +3593,7 @@ cairo_image_surface_create_for_data (unsigned char *data, cairo_format_t format,
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obj->height = height;
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obj->defined = TRUE;
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_push_object (obj);
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dump_stack(__func__);
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_write_unlock ();
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}
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@ -3607,6 +3658,8 @@ cairo_pattern_create_raster_source (void *data, cairo_content_t content, int wid
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pattern_id);
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_push_operand (PATTERN, ret);
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_get_object (PATTERN, ret)->defined = TRUE;
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dump_stack(__func__);
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_write_unlock ();
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}
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@ -3630,19 +3683,28 @@ cairo_surface_create_similar (cairo_surface_t *other,
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Object *other_obj = _get_object(SURFACE, other);
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Object *new_obj = _create_surface (ret);
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if (other_obj->defined)
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if (other_obj->operand != -1) {
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if (current_stack_depth == other_obj->operand + 1)
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_trace_printf ("dup ");
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else
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_trace_printf ("%d index ",
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current_stack_depth - other_obj->operand - 1);
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} else {
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assert(other_obj->defined);
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_trace_printf ("s%ld ", other_obj->token);
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else if (current_stack_depth == other_obj->operand + 1)
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_trace_printf ("dup ");
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else
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_trace_printf ("%d index ",
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current_stack_depth - other_obj->operand - 1);
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_trace_printf ("%d %d //%s similar %% s%ld\n",
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}
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_trace_printf ("%d %d //%s similar dup /s%ld exch def\n",
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width, height,
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_content_to_string (content),
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new_obj->token);
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new_obj->width = width;
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new_obj->height = height;
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new_obj->defined = TRUE;
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_push_object (new_obj);
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dump_stack(__func__);
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_write_unlock ();
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}
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@ -3679,8 +3741,11 @@ cairo_surface_create_similar_image (cairo_surface_t *other,
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_format_to_string (format),
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width, height,
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new_obj->token);
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new_obj->width = width;
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new_obj->height = height;
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_push_object (new_obj);
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dump_stack(__func__);
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_write_unlock ();
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}
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@ -3714,8 +3779,8 @@ cairo_surface_map_to_image (cairo_surface_t *surface,
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_trace_printf ("[ ] map-to-image %% s%ld\n", obj->token);
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}
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obj->unknown = TRUE;
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_push_object (obj);
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dump_stack(__func__);
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_write_unlock ();
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}
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@ -3777,6 +3842,7 @@ cairo_surface_create_for_rectangle (cairo_surface_t *target,
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child_obj->token);
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_push_object (child_obj);
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dump_stack(__func__);
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_write_unlock ();
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}
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@ -4093,6 +4159,7 @@ cairo_pattern_create_for_surface (cairo_surface_t *surface)
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_trace_printf ("pattern %% p%ld\n", pattern_id);
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_push_operand (PATTERN, ret);
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dump_stack(__func__);
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_write_unlock ();
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}
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@ -4116,6 +4183,7 @@ cairo_pattern_create_linear (double x0, double y0, double x1, double y1)
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_trace_printf ("%g %g %g %g linear %% p%ld\n",
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x0, y0, x1, y1, pattern_id);
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_push_operand (PATTERN, ret);
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dump_stack(__func__);
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_write_unlock ();
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}
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@ -4142,6 +4210,7 @@ cairo_pattern_create_radial (double cx0, double cy0, double radius0, double cx1,
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cx0, cy0, radius0, cx1, cy1, radius1,
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pattern_id);
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_push_operand (PATTERN, ret);
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dump_stack(__func__);
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_write_unlock ();
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}
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@ -4257,24 +4326,26 @@ cairo_ft_font_face_create_for_pattern (FcPattern *pattern)
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_emit_line_info ();
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if (pattern != NULL && _write_lock ()) {
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Object *obj;
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FcChar8 *parsed;
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obj = _get_object (FONT_FACE, ret);
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if (obj->operand != -1)
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_object_remove (obj);
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if (obj->unknown) {
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FcChar8 *parsed;
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parsed = DLCALL (FcNameUnparse, pattern);
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_trace_printf ("dict\n"
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" /type 42 set\n"
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" /pattern ");
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_emit_string_literal ((char *) parsed, -1);
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_trace_printf (" set\n"
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" font %% f%ld\n",
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font_face_id);
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_push_operand (FONT_FACE, ret);
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parsed = DLCALL (FcNameUnparse, pattern);
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_trace_printf ("dict\n"
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" /type 42 set\n"
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" /pattern ");
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_emit_string_literal ((char *) parsed, -1);
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_trace_printf (" set\n"
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" font %% f%ld\n",
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font_face_id);
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obj->unknown = FALSE;
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_push_operand (FONT_FACE, ret);
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dump_stack(__func__);
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free (parsed);
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}
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_write_unlock ();
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free (parsed);
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}
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_exit_trace ();
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@ -4332,6 +4403,7 @@ cairo_ft_font_face_create_for_ft_face (FT_Face face, int load_flags)
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_trace_printf (" /index %lu /flags %d >> font %% f%ld\n",
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data->index, load_flags, font_face_id);
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_push_operand (FONT_FACE, ret);
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dump_stack(__func__);
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_write_unlock ();
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}
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@ -4524,6 +4596,7 @@ cairo_ps_surface_create (const char *filename, double width_in_points, double he
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obj->width = width_in_points;
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obj->height = height_in_points;
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_push_object (obj);
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dump_stack(__func__);
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_write_unlock ();
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}
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@ -4555,6 +4628,7 @@ cairo_ps_surface_create_for_stream (cairo_write_func_t write_func, void *closure
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obj->width = width_in_points;
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obj->height = height_in_points;
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_push_object (obj);
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dump_stack(__func__);
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_write_unlock ();
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}
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@ -4603,6 +4677,7 @@ cairo_pdf_surface_create (const char *filename, double width_in_points, double h
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obj->width = width_in_points;
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obj->height = height_in_points;
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_push_object (obj);
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dump_stack(__func__);
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_write_unlock ();
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}
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@ -4634,6 +4709,7 @@ cairo_pdf_surface_create_for_stream (cairo_write_func_t write_func, void *closur
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obj->width = width_in_points;
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obj->height = height_in_points;
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_push_object (obj);
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dump_stack(__func__);
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_write_unlock ();
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}
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_exit_trace ();
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@ -4680,6 +4756,7 @@ cairo_svg_surface_create (const char *filename, double width, double height)
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obj->width = width;
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obj->height = height;
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_push_object (obj);
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dump_stack(__func__);
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_write_unlock ();
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}
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@ -4711,6 +4788,7 @@ cairo_svg_surface_create_for_stream (cairo_write_func_t write_func, void *closur
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obj->width = width;
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obj->height = height;
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_push_object (obj);
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dump_stack(__func__);
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_write_unlock ();
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}
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|
|
@ -4742,6 +4820,7 @@ cairo_image_surface_create_from_png (const char *filename)
|
|||
_surface_object_set_size_from_surface (ret);
|
||||
obj->defined = TRUE;
|
||||
_push_object (obj);
|
||||
dump_stack(__func__);
|
||||
_write_unlock ();
|
||||
}
|
||||
|
||||
|
|
@ -4769,6 +4848,7 @@ cairo_image_surface_create_from_png_stream (cairo_read_func_t read_func, void *c
|
|||
_surface_object_set_size_from_surface (ret);
|
||||
obj->defined = TRUE;
|
||||
_push_object (obj);
|
||||
dump_stack(__func__);
|
||||
_write_unlock ();
|
||||
}
|
||||
|
||||
|
|
@ -4783,6 +4863,40 @@ _content_from_surface (cairo_surface_t *surface)
|
|||
return _content_to_string (DLCALL (cairo_surface_get_content, surface));
|
||||
}
|
||||
|
||||
#if CAIRO_HAS_TEE_SURFACE
|
||||
#include <cairo-tee.h>
|
||||
|
||||
cairo_surface_t *
|
||||
cairo_tee_surface_create (cairo_surface_t *master)
|
||||
{
|
||||
cairo_surface_t *ret;
|
||||
|
||||
_enter_trace ();
|
||||
|
||||
ret = DLCALL (cairo_tee_surface_create, master);
|
||||
|
||||
_emit_line_info ();
|
||||
if (_write_lock ()) {
|
||||
Object *obj = _create_surface (ret);
|
||||
|
||||
_trace_printf ("dict\n"
|
||||
" /type /tee set\n"
|
||||
" /master s%ld set\n"
|
||||
" surface dup /s%ld exch def\n",
|
||||
_get_object (SURFACE, master)->token,
|
||||
obj->token);
|
||||
obj->defined = TRUE;
|
||||
_push_object (obj);
|
||||
dump_stack(__func__);
|
||||
_write_unlock ();
|
||||
}
|
||||
|
||||
_exit_trace ();
|
||||
return ret;
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
#if CAIRO_HAS_XLIB_SURFACE
|
||||
#include <cairo-xlib.h>
|
||||
|
||||
|
|
@ -4819,6 +4933,7 @@ cairo_xlib_surface_create (Display *dpy,
|
|||
obj->height = height;
|
||||
obj->foreign = TRUE;
|
||||
_push_object (obj);
|
||||
dump_stack(__func__);
|
||||
_write_unlock ();
|
||||
}
|
||||
|
||||
|
|
@ -4860,6 +4975,7 @@ cairo_xlib_surface_create_for_bitmap (Display *dpy,
|
|||
obj->height = height;
|
||||
obj->foreign = TRUE;
|
||||
_push_object (obj);
|
||||
dump_stack(__func__);
|
||||
_write_unlock ();
|
||||
}
|
||||
|
||||
|
|
@ -4905,6 +5021,7 @@ cairo_xlib_surface_create_with_xrender_format (Display *dpy,
|
|||
obj->height = height;
|
||||
obj->foreign = TRUE;
|
||||
_push_object (obj);
|
||||
dump_stack(__func__);
|
||||
_write_unlock ();
|
||||
}
|
||||
|
||||
|
|
@ -4945,6 +5062,7 @@ cairo_script_surface_create (cairo_device_t *device,
|
|||
obj->height = height;
|
||||
obj->defined = TRUE;
|
||||
_push_object (obj);
|
||||
dump_stack(__func__);
|
||||
_write_unlock ();
|
||||
}
|
||||
|
||||
|
|
@ -4972,6 +5090,7 @@ cairo_script_surface_create_for_target (cairo_device_t *device,
|
|||
obj->token);
|
||||
obj->defined = TRUE;
|
||||
_push_object (obj);
|
||||
dump_stack(__func__);
|
||||
_write_unlock ();
|
||||
}
|
||||
|
||||
|
|
@ -5003,6 +5122,7 @@ _cairo_test_paginated_surface_create (cairo_surface_t *surface)
|
|||
_get_surface_id (surface),
|
||||
obj->token);
|
||||
_push_object (obj);
|
||||
dump_stack(__func__);
|
||||
_write_unlock ();
|
||||
}
|
||||
|
||||
|
|
@ -5036,6 +5156,7 @@ _cairo_test_fallback_compositor_surface_create (cairo_content_t content, int wid
|
|||
obj->token);
|
||||
obj->defined = TRUE;
|
||||
_push_object (obj);
|
||||
dump_stack(__func__);
|
||||
_write_unlock ();
|
||||
}
|
||||
|
||||
|
|
@ -5067,6 +5188,7 @@ _cairo_test_mask_compositor_surface_create (cairo_content_t content, int width,
|
|||
obj->token);
|
||||
obj->defined = TRUE;
|
||||
_push_object (obj);
|
||||
dump_stack(__func__);
|
||||
_write_unlock ();
|
||||
}
|
||||
|
||||
|
|
@ -5098,6 +5220,7 @@ _cairo_test_spans_compositor_surface_create (cairo_content_t content, int width,
|
|||
obj->token);
|
||||
obj->defined = TRUE;
|
||||
_push_object (obj);
|
||||
dump_stack(__func__);
|
||||
_write_unlock ();
|
||||
}
|
||||
|
||||
|
|
@ -5129,6 +5252,7 @@ _cairo_test_traps_compositor_surface_create (cairo_content_t content, int width,
|
|||
obj->token);
|
||||
obj->defined = TRUE;
|
||||
_push_object (obj);
|
||||
dump_stack(__func__);
|
||||
_write_unlock ();
|
||||
}
|
||||
|
||||
|
|
@ -5167,6 +5291,7 @@ cairo_recording_surface_create (cairo_content_t content,
|
|||
}
|
||||
obj->defined = TRUE;
|
||||
_push_object (obj);
|
||||
dump_stack(__func__);
|
||||
_write_unlock ();
|
||||
}
|
||||
|
||||
|
|
@ -5204,6 +5329,7 @@ cairo_vg_surface_create (cairo_vg_context_t *context,
|
|||
obj->height = height;
|
||||
obj->defined = TRUE;
|
||||
_push_object (obj);
|
||||
dump_stack(__func__);
|
||||
_write_unlock ();
|
||||
}
|
||||
|
||||
|
|
@ -5243,6 +5369,7 @@ cairo_vg_surface_create_for_image (cairo_vg_context_t *context,
|
|||
obj->height = height;
|
||||
obj->defined = TRUE;
|
||||
_push_object (obj);
|
||||
dump_stack(__func__);
|
||||
_write_unlock ();
|
||||
}
|
||||
|
||||
|
|
@ -5282,6 +5409,7 @@ cairo_gl_surface_create (cairo_device_t *abstract_device,
|
|||
obj->height = height;
|
||||
obj->defined = TRUE;
|
||||
_push_object (obj);
|
||||
dump_stack(__func__);
|
||||
_write_unlock ();
|
||||
}
|
||||
|
||||
|
|
@ -5319,6 +5447,7 @@ cairo_gl_surface_create_for_texture (cairo_device_t *abstract_device,
|
|||
obj->height = height;
|
||||
obj->defined = TRUE;
|
||||
_push_object (obj);
|
||||
dump_stack(__func__);
|
||||
_write_unlock ();
|
||||
}
|
||||
|
||||
|
|
@ -5353,6 +5482,7 @@ cairo_gl_surface_create_for_window (cairo_device_t *device,
|
|||
obj->height = height;
|
||||
obj->defined = TRUE;
|
||||
_push_object (obj);
|
||||
dump_stack(__func__);
|
||||
_write_unlock ();
|
||||
}
|
||||
|
||||
|
|
@ -5389,6 +5519,7 @@ cairo_gl_surface_create_for_dc (cairo_device_t *device,
|
|||
obj->height = height;
|
||||
obj->defined = TRUE;
|
||||
_push_object (obj);
|
||||
dump_stack(__func__);
|
||||
_write_unlock ();
|
||||
}
|
||||
|
||||
|
|
@ -5425,6 +5556,7 @@ cairo_gl_surface_create_for_egl (cairo_device_t *device,
|
|||
obj->height = height;
|
||||
obj->defined = TRUE;
|
||||
_push_object (obj);
|
||||
dump_stack(__func__);
|
||||
_write_unlock ();
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue