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import cffi
import cairocffi
ffi = cffi.FFI()
ffi.cdef('''
/* GLib */
typedef void cairo_t;
typedef void* gpointer;
void g_object_unref (gpointer object);
/* Pango and PangoCairo */
typedef ... PangoLayout;
typedef enum {
PANGO_ALIGN_LEFT,
PANGO_ALIGN_CENTER,
PANGO_ALIGN_RIGHT
} PangoAlignment;
int pango_units_from_double (double d);
PangoLayout * pango_cairo_create_layout (cairo_t *cr);
void pango_cairo_show_layout (cairo_t *cr, PangoLayout *layout);
void pango_layout_set_width (PangoLayout *layout, int width);
void pango_layout_set_alignment (
PangoLayout *layout, PangoAlignment alignment);
void pango_layout_set_markup (
PangoLayout *layout, const char *text, int length);
''')
gobject = ffi.dlopen('gobject-2.0')
pango = ffi.dlopen('pango-1.0')
pangocairo = ffi.dlopen('pangocairo-1.0')
def gobject_ref(pointer):
return ffi.gc(pointer, gobject.g_object_unref)
units_from_double = pango.pango_units_from_double
def write_example_pdf(target):
pt_per_mm = 72 / 25.4
width, height = 210 * pt_per_mm, 297 * pt_per_mm # A4 portrait
surface = cairocffi.PDFSurface(target, width, height)
context = cairocffi.Context(surface)
context.translate(0, 300)
context.rotate(-0.2)
layout = gobject_ref(
pangocairo.pango_cairo_create_layout(context._pointer))
pango.pango_layout_set_width(layout, units_from_double(width))
pango.pango_layout_set_alignment(layout, pango.PANGO_ALIGN_CENTER)
markup = '<span font="italic 30">Hi from Παν語!</span>'
markup = ffi.new('char[]', markup.encode('utf8'))
pango.pango_layout_set_markup(layout, markup, -1)
pangocairo.pango_cairo_show_layout(context._pointer, layout)
if __name__ == '__main__':
write_example_pdf(target='pango_example.pdf')
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