Re: Printing with gtk+, cairo and pango - need to iterate glyphsand problems with pango attributes

[Behdad Esfahbod <behdad behdad org>]

I get the attached output which looks fine.
Which versions of pango and cairo are you using on Linux?

behdad

On 07/15/2009 11:05 AM, joel weedlight ch wrote:
> I tried the code below on debian GNU/Linux unstable as well on win32. The output
> was a bit different but didn't work on both operating systems.
>
>
> #include<gtk/gtk.h>
>
> void
> begin_print(GtkPrintOperation *operation, GtkPrintContext *context)
> {
>    gtk_print_operation_set_n_pages(operation, 1);
>    gtk_print_operation_set_use_full_page(operation, FALSE);
> }
>
> void
> draw_page(GtkPrintOperation *operation, GtkPrintContext *context, gint page_nr)
> {
>    PangoLayout *layout, *test_attribute, *test_iterateing;
>    PangoFontDescription *desc;
>    PangoAttrList *attr_list;
>    PangoAttribute *attribute;
>    PangoLayoutRun *run;
>    cairo_t *cr;
>    GSList *list0, *list1;
>    PangoRectangle logical_rect;
>    double x_off, y_off;
>    int width, height;
>    guint i;
>
>    cr = gtk_print_context_get_cairo_context(context);
>    layout = gtk_print_context_create_pango_layout(context);
>
>    desc = pango_font_description_from_string("Sans 12\0");
>
>    /* test attribute */
>    test_attribute = pango_layout_copy(layout);
>    pango_layout_set_text(test_attribute, "Title\nsecondary text\0", -1);
>    pango_layout_set_font_description(test_attribute, desc);
>
>    attr_list = pango_attr_list_new();
>
>    attribute = pango_attr_size_new(14);
>    attribute->start_index = 0;
>    attribute->end_index = 6;
>    pango_attr_list_insert(attr_list, attribute);
>
>    attribute = pango_attr_size_new(7);
>    attribute->start_index = 6;
>    attribute->end_index = 15;
>    pango_attr_list_insert(attr_list, attribute);
>
>    pango_layout_set_attributes(test_attribute, attr_list);
>
>    cairo_set_source_rgb(cr, 0.0, 0.0, 0.0);
>    cairo_move_to(cr, 0.0, 0.0);
>    pango_cairo_show_layout(cr, test_attribute);
>
>
>    /* test iterateing */
>    test_iterateing = pango_layout_copy(layout);
>    pango_layout_set_text(test_attribute, "0123456789\0", -1);
>    pango_layout_set_font_description(test_iterateing, desc);
>
>    list0 = pango_layout_get_lines(layout);
>
>    pango_layout_get_size(test_attribute,&width,&height);
>    height *= PANGO_SCALE;
>    y_off = (double) height;
>
>    while(list0 != NULL){
>      list1 = ((PangoLayoutLine *) (list0->data))->runs;
>      x_off = 0.0;
>
>      while(list1 != NULL){
>        run = (PangoLayoutRun *) list1->data;
>
>        pango_glyph_string_extents(run->glyphs, run->item->analysis.font,
> 				 NULL,&logical_rect);
>
>        cairo_move_to(cr, x_off, y_off);
>        pango_cairo_show_glyph_string(cr, run->item->analysis.font, run->glyphs);
>
>        x_off += (double)(logical_rect.width * PANGO_SCALE);
>        list1 = list1->next;
>      }
>
>      y_off += height;
>      list0 = list0->next;
>    }
>
>    g_object_unref(layout);
>    g_object_unref(test_attribute);
>    g_object_unref(test_iterateing);
>
>    pango_font_description_free(desc);
> }
>
> void
> end_print(GtkPrintOperation *operation, GtkPrintContext *context)
> {
> }
>
> gboolean
> delete_event(GtkWindow *window, gpointer data)
> {
>    gtk_main_quit();
>
>    return(FALSE);
> }
>
> void
> button_clicked(GtkButton *button, gpointer data)
> {
>    GtkWindow *window;
>    GtkPrintOperation *operation;
>    GError *error;
>
>    window = (GtkWindow *) gtk_widget_get_toplevel((GtkWidget *) button);
>
>    operation = gtk_print_operation_new();
>    error = NULL;
>
>    g_signal_connect((GObject *) operation, "begin-print\0",
> 		   G_CALLBACK (begin_print), window);
>    g_signal_connect((GObject *) operation, "draw-page\0",
> 		   G_CALLBACK (draw_page), window);
>    g_signal_connect((GObject *) operation, "end-print\0",
> 		   G_CALLBACK (end_print), window);
>
>    gtk_print_operation_run(operation,
> 			  GTK_PRINT_OPERATION_ACTION_PRINT_DIALOG,
> 			  window,
> 			&error);
>
>    if(error != NULL){
>      GtkWidget *dialog;
>
>      dialog = gtk_message_dialog_new ((GtkWindow *) window, 0,
> 				     GTK_MESSAGE_ERROR,
> 				     GTK_BUTTONS_OK,
> 				     "An error occured while trying to print:\0");
>      gtk_message_dialog_format_secondary_text(GTK_MESSAGE_DIALOG(dialog),
> error->message);
>
>      gtk_dialog_run(GTK_DIALOG (dialog));
>      gtk_widget_destroy(dialog);
>
>      g_error_free(error);
>    }
>
>    g_object_unref(operation);
> }
>
>
> int
> main(int argc, char **argv)
> {
>    GtkWindow *window;
>    GtkButton *button;
>
>    gtk_init(&argc,&argv);
>
>    window = (GtkWindow *) gtk_window_new(GTK_WINDOW_TOPLEVEL);
>    g_signal_connect((GObject *) window, "delete-event\0",
> 		   G_CALLBACK(delete_event), NULL);
>
>    button = (GtkButton *) gtk_button_new_with_label("print\0");
>    gtk_container_add((GtkContainer *) window, (GtkWidget *) button);
>    g_signal_connect((GObject *) button, "clicked\0",
> 		   G_CALLBACK(button_clicked), NULL);
>
>    gtk_widget_show_all((GtkWidget *) window);
>
>    gtk_main();
>
>    return(0);
> }
>
>
>
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