[cairo] Crash in 1.8.6 win32 with PDF surface

[Behdad Esfahbod]

On 04/24/2009 11:59 AM, Gerdus van Zyl wrote:
> 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.

The context has a reference to the surface.  And _finish should be called 
automatically *if* the last reference to the surface is dropped.  So, calling 
it would be a good test to see if that's the problem.

behdad

> 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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