[Poppler-bugs] [Bug 77790] get_text_layout introspection mismatch

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77790

--- Comment #1 from Anselm Kruis <a.kruis at science-computing.de> ---
I have exactly the same issue with python. I was able to work around problem
using the ctypes foreign function interface of Python.
The code is for Python 2.7. It should be possible create a gi.overrides.Poppler
module based on this code. This would fix the issue for Python.

from gi.repository import Poppler, GLib
import ctypes
lib_poppler = ctypes.cdll.LoadLibrary("libpoppler-glib-8")

ctypes.pythonapi.PyCapsule_GetPointer.restype = ctypes.c_void_p
ctypes.pythonapi.PyCapsule_GetPointer.argtypes = [ctypes.py_object,
ctypes.c_char_p]
PyCapsule_GetPointer = ctypes.pythonapi.PyCapsule_GetPointer

class Poppler_Rectangle(ctypes.Structure):
    _fields_ = [ ("x1", ctypes.c_double), ("y1", ctypes.c_double), ("x2",
ctypes.c_double), ("y2", ctypes.c_double) ]
LP_Poppler_Rectangle = ctypes.POINTER(Poppler_Rectangle)
poppler_page_get_text_layout = ctypes.CFUNCTYPE(ctypes.c_int, 
                                                ctypes.c_void_p, 
                                               
ctypes.POINTER(LP_Poppler_Rectangle), 
                                                ctypes.POINTER(ctypes.c_uint)
                                               
)(lib_poppler.poppler_page_get_text_layout)

def get_page_layout(page):
    assert isinstance(page, Poppler.Page)
    capsule = page.__gpointer__
    page_addr = PyCapsule_GetPointer(capsule, None)
    rectangles = LP_Poppler_Rectangle()
    n_rectangles = ctypes.c_uint(0)
    has_text = poppler_page_get_text_layout(page_addr,
ctypes.byref(rectangles), ctypes.byref(n_rectangles))
    try:
        result = []
        if has_text:
            assert n_rectangles.value > 0, "n_rectangles.value > 0:
{}".format(n_rectangles.value)
            assert rectangles, "rectangles: {}".format(rectangles)
            for i in range(n_rectangles.value):
                r = rectangles[i]
                result.append((r.x1, r.y1, r.x2, r.y2))
        return result
    finally:
        if rectangles:
            GLib.free(ctypes.addressof(rectangles.contents))

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