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pdf: Don't emit /PageLabel dict when no labels defined

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This commit is contained in:
Adrian Johnson 2017-08-21 21:23:45 +09:30
parent e3857c133f
commit 4c12e2aec3
1 changed files with 59 additions and 47 deletions
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106
src/cairo-pdf-interchange.c
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@ -654,58 +654,70 @@ cairo_pdf_interchange_write_page_labels (cairo_pdf_surface_t *surface)
char *prev_prefix;
int num, prev_num;
cairo_int_status_t status;
cairo_bool_t has_labels;
/* Check if any labels defined */
num_elems = _cairo_array_num_elements (&surface->page_labels);
if (num_elems > 0) {
surface->page_labels_res = _cairo_pdf_surface_new_object (surface);
_cairo_output_stream_printf (surface->output,
"%d 0 obj\n"
"<< /Nums [\n",
surface->page_labels_res.id);
prefix = NULL;
prev_prefix = NULL;
num = 0;
prev_num = 0;
for (i = 0; i < num_elems; i++) {
_cairo_array_copy_element (&surface->page_labels, i, &label);
if (label) {
prefix = split_label (label, &num);
} else {
prefix = NULL;
num = i + 1;
}
if (!strcmp_null (prefix, prev_prefix) || num != prev_num + 1) {
_cairo_output_stream_printf (surface->output, " %d << ", i);
if (num)
_cairo_output_stream_printf (surface->output, "/S /D /St %d ", num);
if (prefix) {
char *s;
status = _cairo_utf8_to_pdf_string (prefix, &s);
if (unlikely (status))
return status;
_cairo_output_stream_printf (surface->output, "/P %s ", s);
free (s);
}
_cairo_output_stream_printf (surface->output, ">>\n");
}
free (prev_prefix);
prev_prefix = prefix;
prefix = NULL;
prev_num = num;
has_labels = FALSE;
for (i = 0; i < num_elems; i++) {
_cairo_array_copy_element (&surface->page_labels, i, &label);
if (label) {
has_labels = TRUE;
break;
}
free (prefix);
free (prev_prefix);
_cairo_output_stream_printf (surface->output,
" ]\n"
">>\n"
"endobj\n");
}
if (!has_labels)
return CAIRO_STATUS_SUCCESS;
surface->page_labels_res = _cairo_pdf_surface_new_object (surface);
_cairo_output_stream_printf (surface->output,
"%d 0 obj\n"
"<< /Nums [\n",
surface->page_labels_res.id);
prefix = NULL;
prev_prefix = NULL;
num = 0;
prev_num = 0;
for (i = 0; i < num_elems; i++) {
_cairo_array_copy_element (&surface->page_labels, i, &label);
if (label) {
prefix = split_label (label, &num);
} else {
prefix = NULL;
num = i + 1;
}
if (!strcmp_null (prefix, prev_prefix) || num != prev_num + 1) {
_cairo_output_stream_printf (surface->output, " %d << ", i);
if (num)
_cairo_output_stream_printf (surface->output, "/S /D /St %d ", num);
if (prefix) {
char *s;
status = _cairo_utf8_to_pdf_string (prefix, &s);
if (unlikely (status))
return status;
_cairo_output_stream_printf (surface->output, "/P %s ", s);
free (s);
}
_cairo_output_stream_printf (surface->output, ">>\n");
}
free (prev_prefix);
prev_prefix = prefix;
prefix = NULL;
prev_num = num;
}
free (prefix);
free (prev_prefix);
_cairo_output_stream_printf (surface->output,
" ]\n"
">>\n"
"endobj\n");
return CAIRO_STATUS_SUCCESS;
}