def create_context(self) -> Context:
"""
Creates a Pango ``Context`` connected to ``fontmap``. This is
equivalent to ``pango.Context()`` followed by
``context.set_font_map()``.
:return:
the newly allocated Pango ``Context``.
"""
context_pointer = pango.pango_font_map_create_context(
self.get_pointer())
return Context.from_pointer(context_pointer, gc=True)
def get_pango_context() -> Context:
ffi = FFI()
ffi.include(ffi_builder)
ffi.cdef('''
/* Cairo */
typedef void cairo_t;
typedef struct _cairo_surface cairo_surface_t;
typedef enum _cairo_status {
CAIRO_STATUS_SUCCESS = 0,
CAIRO_STATUS_NO_MEMORY,
CAIRO_STATUS_INVALID_RESTORE,
CAIRO_STATUS_INVALID_POP_GROUP,
CAIRO_STATUS_NO_CURRENT_POINT,
CAIRO_STATUS_INVALID_MATRIX,
CAIRO_STATUS_INVALID_STATUS,
CAIRO_STATUS_NULL_POINTER,
CAIRO_STATUS_INVALID_STRING,
CAIRO_STATUS_INVALID_PATH_DATA,
CAIRO_STATUS_READ_ERROR,
CAIRO_STATUS_WRITE_ERROR,
CAIRO_STATUS_SURFACE_FINISHED,
CAIRO_STATUS_SURFACE_TYPE_MISMATCH,
CAIRO_STATUS_PATTERN_TYPE_MISMATCH,
CAIRO_STATUS_INVALID_CONTENT,
CAIRO_STATUS_INVALID_FORMAT,
CAIRO_STATUS_INVALID_VISUAL,
CAIRO_STATUS_FILE_NOT_FOUND,
CAIRO_STATUS_INVALID_DASH,
CAIRO_STATUS_INVALID_DSC_COMMENT,
CAIRO_STATUS_INVALID_INDEX,
CAIRO_STATUS_CLIP_NOT_REPRESENTABLE,
CAIRO_STATUS_TEMP_FILE_ERROR,
CAIRO_STATUS_INVALID_STRIDE,
CAIRO_STATUS_FONT_TYPE_MISMATCH,
CAIRO_STATUS_USER_FONT_IMMUTABLE,
CAIRO_STATUS_USER_FONT_ERROR,
CAIRO_STATUS_NEGATIVE_COUNT,
CAIRO_STATUS_INVALID_CLUSTERS,
CAIRO_STATUS_INVALID_SLANT,
CAIRO_STATUS_INVALID_WEIGHT,
CAIRO_STATUS_INVALID_SIZE,
CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED,
CAIRO_STATUS_DEVICE_TYPE_MISMATCH,
CAIRO_STATUS_DEVICE_ERROR,
CAIRO_STATUS_INVALID_MESH_CONSTRUCTION,
CAIRO_STATUS_DEVICE_FINISHED,
CAIRO_STATUS_JBIG2_GLOBAL_MISSING,
CAIRO_STATUS_PNG_ERROR,
CAIRO_STATUS_FREETYPE_ERROR,
CAIRO_STATUS_WIN32_GDI_ERROR,
CAIRO_STATUS_TAG_ERROR,
CAIRO_STATUS_LAST_STATUS
} cairo_status_t;
typedef cairo_status_t (*cairo_write_func_t) (
void * closure,
const unsigned char *data,
unsigned int length
);
cairo_surface_t * cairo_pdf_surface_create_for_stream (
cairo_write_func_t write_func,
void *closure,
double width_in_points,
double height_in_points
);
void cairo_surface_destroy (cairo_surface_t *surface);
cairo_t * cairo_create (cairo_surface_t *target);
void cairo_destroy (cairo_t *cr);
PangoContext * pango_cairo_create_context (cairo_t *cr);
''')
ffi.set_source('pangocffi._generated.ffi', None)
cairo = ffi.dlopen('cairo')
pangocairo = ffi.dlopen('pangocairo-1.0')
cairo_surface_t = cairo.cairo_pdf_surface_create_for_stream(
ffi.NULL, ffi.NULL, 10, 10)
cairo_t = cairo.cairo_create(cairo_surface_t)
pango_pointer = pangocairo.pango_cairo_create_context(cairo_t)
pango_pointer = pangocffi.ffi.cast('PangoContext *', pango_pointer)
pango_pointer = pangocffi.ffi.gc(pango_pointer,
pangocffi.gobject.g_object_unref)
ContextCreator.cairo = cairo
ContextCreator.cairo_surface_t = cairo_surface_t
ContextCreator.cairo_t = cairo_t
ContextCreator.pango_context = Context.from_pointer(pango_pointer)
return ContextCreator.pango_context
def test_context_returns_null_from_null_pointer(self):
with self.assertRaises(ValueError):
Context.from_pointer(ffi.NULL)
def test_context_init_identical_context(self):
context = Context()
identical_context = Context.from_pointer(context.get_pointer())
assert identical_context == context
def get_pango_context_as_class(self) -> Context:
return Context.from_pointer(self.pango_context, gc=True)