> On Mon, Jan 28, 2019 at 07:33:54PM +0000, Frediano Ziglio wrote:
> > Zlib structure take up more than 1MB and it is rarely used nowadays
> > as it is not much effective.
> > Initialise it only when necessary saving some memory in the normal
> > case.
> >
> > Signed-off-by: Frediano Ziglio <fziglio@xxxxxxxxxx>
> > ---
> > server/image-encoders.c | 19 +++++++++++--------
> > 1 file changed, 11 insertions(+), 8 deletions(-)
> >
> > Changes since v1:
> > - log a warning if zlib encoding cannot be initialized
> >
> > diff --git a/server/image-encoders.c b/server/image-encoders.c
> > index 88073a3e..f35621ff 100644
> > --- a/server/image-encoders.c
> > +++ b/server/image-encoders.c
> > @@ -451,12 +451,6 @@ static void image_encoders_init_zlib(ImageEncoders
> > *enc)
> > {
> > enc->zlib_data.usr.more_space = zlib_usr_more_space;
> > enc->zlib_data.usr.more_input = zlib_usr_more_input;
> > -
> > - enc->zlib = zlib_encoder_create(&enc->zlib_data.usr,
> > ZLIB_DEFAULT_COMPRESSION_LEVEL);
> > -
> > - if (!enc->zlib) {
> > - spice_critical("create zlib encoder failed");
> > - }
> > }
> >
> > void image_encoders_init(ImageEncoders *enc, ImageEncoderSharedData
> > *shared_data)
> > @@ -494,8 +488,10 @@ void image_encoders_free(ImageEncoders *enc)
> > lz4_encoder_destroy(enc->lz4);
> > enc->lz4 = NULL;
> > #endif
> > - zlib_encoder_destroy(enc->zlib);
> > - enc->zlib = NULL;
> > + if (enc->zlib) {
>
> if (enc->zlib != NULL)
>
> > + zlib_encoder_destroy(enc->zlib);
> > + enc->zlib = NULL;
> > + }
> > pthread_mutex_destroy(&enc->glz_drawables_inst_to_free_lock);
> > }
> >
> > @@ -1261,6 +1257,13 @@ bool image_encoders_compress_glz(ImageEncoders *enc,
> > if (!enable_zlib_glz_wrap || (glz_size < MIN_GLZ_SIZE_FOR_ZLIB)) {
> > goto glz;
> > }
> > + if (!enc->zlib) {
>
> This is a pointer, not a boolean, so I'd prefer if (enc->zlib == NULL)
>
In C99 is perfectly fine to check pointer like this, is just
a question of style, we just use C89 here instead of C99.
> > + enc->zlib = zlib_encoder_create(&enc->zlib_data.usr,
> > ZLIB_DEFAULT_COMPRESSION_LEVEL);
> > + if (!enc->zlib) {
>
> Ditto
>
> > + g_warning("create zlib encoder failed");
>
> I believe any of "zlib_encoder_create failed" or "zlib encoder creation
> failed" or
> "creating zlib encoder failed" would be more grammatically correct.
>
I think was just copied, updated.
> > + goto glz;
> > + }
> > + }
>
>
> Acked-by: Christophe Fergeau <cfergeau@xxxxxxxxxx>
>
Frediano
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