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[smooth] Avoid memory like in case of failure. 

* src/smooth/ftsmooth.c (ft_smooth_render_generic): Use flags to
indicate what to clean up after finishing the function, with and
without errors.
This commit is contained in:
Werner Lemberg 2012-07-11 12:05:58 +02:00
parent fff6dcf1fe
commit e7454a47e2
2 changed files with 52 additions and 13 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2012-07-11 Werner Lemberg <wl@gnu.org>
[smooth] Avoid memory like in case of failure.
* src/smooth/ftsmooth.c (ft_smooth_render_generic): Use flags to
indicate what to clean up after finishing the function, with and
without errors.
2012-07-09 Werner Lemberg <wl@gnu.org>
Fix compilation with MSVC 5.0.

57
src/smooth/ftsmooth.c
View File

@ -117,6 +117,10 @@
FT_Raster_Params params;
FT_Bool have_translated_origin = FALSE;
FT_Bool have_outline_shifted = FALSE;
FT_Bool have_buffer = FALSE;
/* check glyph image format */
if ( slot->format != render->glyph_format )
@ -127,13 +131,19 @@
/* check mode */
if ( mode != required_mode )
return Smooth_Err_Cannot_Render_Glyph;
{
error = Smooth_Err_Cannot_Render_Glyph;
goto Exit;
}
outline = &slot->outline;
/* translate the outline to the new origin if needed */
if ( origin )
{
FT_Outline_Translate( outline, origin->x, origin->y );
have_translated_origin = TRUE;
}
/* compute the control box, and grid fit it */
FT_Outline_Get_CBox( outline, &cbox );
@ -148,17 +158,19 @@
FT_ERROR(( "ft_smooth_render_generic: glyph too large:"
" xMin = %d, xMax = %d\n",
cbox.xMin >> 6, cbox.xMax >> 6 ));
return Smooth_Err_Raster_Overflow;
error = Smooth_Err_Raster_Overflow;
goto Exit;
}
else
width = ( cbox.xMax - cbox.xMin ) >> 6;
width = ( cbox.xMax - cbox.xMin ) >> 6;
if ( cbox.yMin < 0 && cbox.yMax > FT_INT_MAX + cbox.yMin )
{
FT_ERROR(( "ft_smooth_render_generic: glyph too large:"
" yMin = %d, yMax = %d\n",
cbox.yMin >> 6, cbox.yMax >> 6 ));
return Smooth_Err_Raster_Overflow;
error = Smooth_Err_Raster_Overflow;
goto Exit;
}
else
height = ( cbox.yMax - cbox.yMin ) >> 6;
@ -221,13 +233,14 @@
#if FT_UINT_MAX > 0xFFFFU
/* Required check is ( pitch * height < FT_ULONG_MAX ), */
/* but we care realistic cases only. Always pitch <= width. */
/* Required check is (pitch * height < FT_ULONG_MAX), */
/* but we care realistic cases only. Always pitch <= width. */
if ( width > 0x7FFF || height > 0x7FFF )
{
FT_ERROR(( "ft_smooth_render_generic: glyph too large: %u x %u\n",
width, height ));
return Smooth_Err_Raster_Overflow;
error = Smooth_Err_Raster_Overflow;
goto Exit;
}
#endif
@ -240,9 +253,12 @@
/* translate outline to render it into the bitmap */
FT_Outline_Translate( outline, -x_shift, -y_shift );
have_outline_shifted = TRUE;
if ( FT_ALLOC( bitmap->buffer, (FT_ULong)pitch * height ) )
goto Exit;
else
have_buffer = TRUE;
slot->internal->flags |= FT_GLYPH_OWN_BITMAP;
@ -288,6 +304,9 @@
vec->y /= 3;
}
if ( error )
goto Exit;
if ( slot->library->lcd_filter_func )
slot->library->lcd_filter_func( bitmap, mode, slot->library );
@ -295,6 +314,8 @@
/* render outline into bitmap */
error = render->raster_render( render->raster, &params );
if ( error )
goto Exit;
/* expand it horizontally */
if ( hmul )
@ -346,25 +367,35 @@
#endif /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
FT_Outline_Translate( outline, x_shift, y_shift );
/*
* XXX: on 16bit system, we return an error for huge bitmap
* to prevent an overflow.
*/
if ( x_left > FT_INT_MAX || y_top > FT_INT_MAX )
return Smooth_Err_Invalid_Pixel_Size;
if ( error )
{
error = Smooth_Err_Invalid_Pixel_Size;
goto Exit;
}
slot->format = FT_GLYPH_FORMAT_BITMAP;
slot->bitmap_left = (FT_Int)x_left;
slot->bitmap_top = (FT_Int)y_top;
/* everything is fine; don't deallocate buffer */
have_buffer = FALSE;
error = Smooth_Err_Ok;
Exit:
if ( outline && origin )
if ( have_outline_shifted )
FT_Outline_Translate( outline, x_shift, y_shift );
if ( have_translated_origin )
FT_Outline_Translate( outline, -origin->x, -origin->y );
if ( have_buffer )
{
FT_FREE( bitmap->buffer );
slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP;
}
return error;
}