[cairo] Crash in 1.8.6 win32 with PDF surface

[Gerdus van Zyl]

Try reversing the lines:
    cairo_surface_destroy(surface);
    cairo_destroy(cr);

destroying the surface before the context looks suspect. and when
working with PDF you might want a cairo_surface_finish before
destroying.


On Fri, Apr 24, 2009 at 4:17 PM, Darren Gallagher <dazzag at gmail.com> wrote:
> Using 1.8.6 on windows (with pixman 0.15.2).  Built using instructions here:
> http://www.williamcyap.com/software/cairo-lib/compiling-cairo-for-windows.xhtml
>
> produces a crash witin cairo_destroy() somewhere.
>
> The code is as follows:
>
> #include <cairo.h>
> #include <cairo-pdf.h>
>
> int main (int argc, char *argv[])
> {
>     cairo_surface_t *surface;
>     cairo_t *cr;
>
>     surface = cairo_pdf_surface_create ("hellocairo.pdf" , 504, 648);
>     cr = cairo_create (surface);
>     cairo_set_source_rgb(cr, 0, 0, 0);
>     cairo_select_font_face (cr, "serif", CAIRO_FONT_SLANT_NORMAL,
> CAIRO_FONT_WEIGHT_NORMAL);
>     cairo_set_font_size (cr, 40.0);
>     cairo_move_to(cr, 10.0, 50.0);
>     cairo_show_text(cr, "Hello, Cairo!");
>     cairo_show_page(cr);
>     cairo_surface_destroy(surface);
>     cairo_destroy(cr);
>
>     return 0;
> }
>
> the stack is as follows:
>
>      ntdll.dll!7c90120e()
>      [Frames below may be incorrect and/or missing, no symbols loaded for
> ntdll.dll]
>      ntdll.dll!7c96c201()
>      ntdll.dll!7c96c63e()
>      ntdll.dll!7c9603b0()
>      kernel32.dll!7c85f8d7()
>      msvcr80d.dll!_CrtIsValidHeapPointer(const void * pUserData=0x00955c50)
> Line 2072    C++
>      msvcr80d.dll!_free_dbg_nolock(void * pUserData=0x00955c50, int
> nBlockUse=1)  Line 1279 + 0x9 bytes    C++
>      msvcr80d.dll!_free_dbg(void * pUserData=0x00955c50, int nBlockUse=1)
> Line 1220 + 0xd bytes    C++
>      msvcr80d.dll!free(void * pUserData=0x00955c50)  Line 1178 + 0xb
> bytes    C++
>      libcairod.dll!_cairo_truetype_subset_fini(_cairo_truetype_subset *
> subset=0x0012f22c)  Line 1171 + 0xe bytes    C
>
> libcairod.dll!_cairo_pdf_surface_emit_truetype_font_subset(_cairo_pdf_surface
> * surface=0x00436fe0, _cairo_scaled_font_subset * font_subset=0x0012f4c8)
> Line 3451 + 0xc bytes    C
>
> libcairod.dll!_cairo_pdf_surface_emit_unscaled_font_subset(_cairo_scaled_font_subset
> * font_subset=0x0012f4c8, void * closure=0x00436fe0)  Line 3722 + 0xd
> bytes    C
>      libcairod.dll!_cairo_sub_font_collect(void * entry=0x0043af78, void *
> closure=0x0012f614)  Line 578 + 0x15 bytes    C
>
> libcairod.dll!_cairo_scaled_font_subsets_foreach_internal(_cairo_scaled_font_subsets
> * font_subsets=0x004386b8, _cairo_status (_cairo_scaled_font_subset *, void
> *)* font_subset_callback=0x100b67a0, void * closure=0x00436fe0,
> cairo_subsets_foreach_type_t type=CAIRO_SUBSETS_FOREACH_UNSCALED)  Line 889
> + 0xd bytes    C
>
> libcairod.dll!_cairo_scaled_font_subsets_foreach_unscaled(_cairo_scaled_font_subsets
> * font_subsets=0x004386b8, _cairo_status (_cairo_scaled_font_subset *, void
> *)* font_subset_callback=0x100b67a0, void * closure=0x00436fe0)  Line 918 +
> 0x13 bytes    C
>      libcairod.dll!_cairo_pdf_surface_emit_font_subsets(_cairo_pdf_surface *
> surface=0x00436fe0)  Line 3774 + 0x18 bytes    C
>      libcairod.dll!_cairo_pdf_surface_finish(void *
> abstract_surface=0x00436fe0)  Line 1195 + 0x9 bytes    C
>      libcairod.dll!cairo_surface_finish(_cairo_surface *
> surface=0x00436fe0)  Line 530 + 0x10 bytes    C
>      libcairod.dll!_cairo_paginated_surface_finish(void *
> abstract_surface=0x00433998)  Line 172 + 0xf bytes    C
>      libcairod.dll!cairo_surface_finish(_cairo_surface *
> surface=0x00433998)  Line 530 + 0x10 bytes    C
>      libcairod.dll!cairo_surface_destroy(_cairo_surface *
> surface=0x00433998)  Line 435 + 0x9 bytes    C
>      libcairod.dll!_cairo_gstate_fini(_cairo_gstate * gstate=0x00438a30)
> Line 205 + 0xf bytes    C
>      libcairod.dll!cairo_destroy(_cairo * cr=0x00438a10)  Line 228 + 0xc
> bytes    C
>>    hellocairo.exe!main(int argc=2, char * * argv=0x00436f58)  Line 49 +
>> 0xc bytes    C
>      hellocairo.exe!__tmainCRTStartup()  Line 597 + 0x19 bytes    C
>      hellocairo.exe!mainCRTStartup()  Line 414    C
>      kernel32.dll!7c817067()
>
> Any help appreciated.
>
> Thanks
>
> Daz
>
>
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