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

[Behdad Esfahbod <behdad behdad org>]

Uh, looks like may be a bug with our win32 backends.  Can you try on Linux?

behdad

On 07/09/2009 08:07 AM, joel weedlight ch wrote:
> Hi
> I'm trying to print a form which I developed with gtk+. I developed it on m$
> Vista with mingw and glade libraries from sourceforge.net. I didn't write it on
> GNU/Linux because it should run on win32. That's why I installed ghostscript and
> FreePDF to print to PDF to save toner and paper.
> I don't understand why the following codes don't work and I have a need for both
> for simple usage and iterating glyphs!
>
> First I tried this whereby every letter seems to be painted at same position:
>
> void
> ar_print_draw_page(ArPrint *print, GtkPrintOperation *operation, GtkPrintContext
> *context, gint page_nr)
> {
>    cairo_t *cr;
>    PangoLayout *layout;
>    PangoFontDescription *desc;
>    PangoAttrList *attribute_list;
>    PangoAttribute *attribute;
>    PangoLayoutRun *run;
>    PangoRectangle logical_rect;
>    GList *list_line, *list_run;
>    guint x_offset, y_offset;
>    void ar_print_draw_page_header(){
>      gdouble info_width;
>      gdouble font_size, offset;
>
>      info_width = (print->content_width) * (5.35 / 18.5);
>      offset = 0.0;
>
>      cairo_set_source_rgb(cr, 0.0, 0.0, 1.0);
>
>      cairo_rectangle(cr, print->padding_left + info_width, print->padding_top,
> print->content_width - info_width, print->header_height);
>      cairo_fill(cr);
>
>      cairo_rectangle(cr, print->padding_left, print->padding_top, info_width,
> print->header_height);
>      cairo_stroke(cr);
>
>      layout = gtk_print_context_create_pango_layout(context);
>      //    layout = pango_layout_new(pango_cairo_create_context(cr));
>      pango_layout_set_text(layout, "Title\nsecondary text\0", -1);
>
>      desc = pango_font_description_from_string("Arial 10\0");
>      pango_layout_set_font_description(layout, desc);
>      //    pango_font_description_free(desc);
>
>      attribute_list = pango_attr_list_new();
>
>      attribute = pango_attr_size_new(9);
>      attribute->start_index = 0;
>      attribute->end_index = 6;
>      pango_attr_list_insert(attribute_list, attribute);
>
>      attribute = pango_attr_size_new(7);
>      attribute->start_index = 6;
>      attribute->end_index = 15;
>      pango_attr_list_insert(attribute_list, attribute);
>
>      pango_layout_set_attributes(layout, attribute_list);
>      pango_layout_set_alignment(layout, PANGO_ALIGN_LEFT);
>
>      pango_layout_context_changed(layout);
>
>      cairo_set_source_rgb(cr, 0.0, 0.0, 0.0);
>      cairo_move_to(cr, print->padding_left, print->padding_top);
>      pango_cairo_show_layout(cr, layout);
>
>      g_object_unref(layout);
>
>    }
>    void ar_print_draw_page_body(){
>    }
>    void ar_print_draw_page_footer(){
>    }
>
>    cr = gtk_print_context_get_cairo_context(context);
>
>    ar_print_draw_page_header();
>    ar_print_draw_page_body();
>    ar_print_draw_page_footer();
> }
>
> furthermore I tried something like following and got the same result as above:
>
> void
> ar_print_draw_page(ArPrint *print, GtkPrintOperation *operation, GtkPrintContext
> *context, gint page_nr)
> {
>   ...
>
>   list0 = pango_layout_get_lines(layout);
>
>   y_off = 0;
>
>   for(i = 0; i<  rows&&  list0 != NULL; i++){
>     list1 = ((PangoLayoutLine *) (list0->data))->runs;
>     x_off = 0;
>
>     while(list1 != NULL){
>       run = (PangoLayoutRun *) list1->data;
>
>       pango_glyph_string_extents(run->glyphs, run->item->analysis.font,
>                                  NULL,&logical_rect);
>
>       pango_cairo_show_glyph_string(cr, run->item->analysis.font, run->glyphs);
>
>       x_off += logical_rect.width;
>       list1 = list1->next;
>     }
>
>     y_off += height;
>     list0 = list0->next;
>   }
>
>    ...
> }
>
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