Does anyone know how to do the equivalent of this using ctypes?
image_data = malloc(width * height * components);
row_pointers = png_get_rows(png_ptr, info_ptr);
for (y = 0; y < height; y++)
memcpy(&image_data[width * components * y],
row_pointers[height-y-1],
width * components);
That is, I need to get the address of a location *within* an allocated
array. This is what I've got:
image_data = create_string_buffer(width * height * components)
address = addressof(image_data)
row_pointers = libpng.png_get_rows(png_ptr, info_ptr)
for y in xrange(height):
row = string_at(address + width * components * y)
memmove(row, row_pointers[height-y-1], width * components)
but that's not correct. Either the addressof() or string_at() are not
working according to my understanding from the docs, because that code
segfaults. FWIW, I also tried:
row = image_data + width * components * y
but you can't add an int to a c_char_Array_2415600.
Sadly the docs don't seem to be finished :(
http://docs.python.org/dev/lib/ctypes-arrays-pointers.html
--
http://mail.python.org/mailman/listinfo/python-list
