1. pygame
  2. pygame
  3. pygame


Issue #144 resolved

unable to render text

Anonymous created an issue


I'm not too sure if this is the right place to enter this issue. Just trying my hands on some pygame tutorials and I have the following problem when trying to render text.

File "<stdin>", line 1, in <module> File "/Library/Python/2.7/site-packages/pygame/font.py", line 68, in render s, r = super(Font, self).render(text, color, background) SystemError: error return without exception set

Does anyone knows what's wrong?

Comments (10)

  1. donLorenzo

    The Error message indicates that the CPython C-API is being used wrong. To track down the Problem it would be helpful if you could post a minimal example reproducing the exception or at least a link to the tutorial you were following with a comment where the problem occurs.

  2. Lenard Lindstrom

    The error message given by the original poster can only come from the font.py wrapper for the freetype module. I looked at the latest available Pygame installer for Python 2.7-uploaded on 2012-02-17 as of writing this post-and it uses the SDL_ttf based font extension module, written in C. So my guess is a more recent Pygame version was installed on top of another version. So far I have found no ready solution to get the Pygame windows installer to completely replace an earlier Pygame version. I may look into it again.

  3. Lenard Lindstrom

    Okay, this is an x86_64 problem, an overlooked detail that would have simplified debugging. I have duplicated the problem on an Intel iMac, and possibly fixed it—the freetype module specific unit tests pass. Will commit the patch and close this issue once I verify the fix has not broken something else.

  4. Lenard Lindstrom

    Along with changeset 9cac2ec83346, this fixes issue #144

    Changeset 9cac2ec83346 addressed the first bug uncovered by issued #144. This changeset addresses the other problem, with exporting of the Pygame C api.

    This changeset makes the PyGAME_C_API array a C global for each extension module, with the main declaration in the C file that imports a Pygame api, by including pygame.h, and extern in any other C source files which include _pygame.h instead.

    Explanation of the originally reported bug:

    The _freetype extension module is defined over several C source files. The Python level interface is defined in _freetype.c, which imports other Pygame extension modules for their C apis. The other freetype source files are defined in the src/freetype subdirectory. They also access the Pygame C api. Unfortunately, the Pygame C api pointer array PyGAME_C_API was declared as static, giving each C file its own copy of the array. Only the array local to _freetype.c was initialized; the other instances had undefined pointers. In the _PGFT_Render_NewSurface of file ft_render.c, SDL_CreateRGBSurface returned an SDL exception, because the surface width and height values were too large (due to the bug fixed in changeset 9cac2ec83346). A NULL pointer in the PyGAME_C_API entry for PyExc_SDLError meant the PyErr_SetString call failed to set a Python exception. So _PGFT_Render_NewSurface, and subsequently the freetype.Font.render method, returned a NULL object without an exception. Python raised a SystemError as a result.

    → <<cset e5f2ccbf7965>>

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