Re: Compressed SVG? (and a couple of announcements)

If you are using gzip and not simple flate - then yes.  But you need to make that VERY clear since most folks will assume that you are not doing that...

Leonard

From: Behdad Esfahbod <behdad@google.com<mailto:behdad@google.com>>
Date: Friday, October 10, 2014 at 2:30 AM
To: Robert O'Callahan <robert@ocallahan.org<mailto:robert@ocallahan.org>>
Cc: Sairus Patel <sppatel@adobe.com<mailto:sppatel@adobe.com>>, "public-svgopentype@w3.org<mailto:public-svgopentype@w3.org>" <public-svgopentype@w3.org<mailto:public-svgopentype@w3.org>>
Subject: Re: Compressed SVG? (and a couple of announcements)
Resent-From: "public-svgopentype@w3.org<mailto:public-svgopentype@w3.org>" <public-svgopentype@w3.org<mailto:public-svgopentype@w3.org>>
Resent-Date: Friday, October 10, 2014 at 2:31 AM

On Wed, Oct 8, 2014 at 1:02 PM, Robert O'Callahan <robert@ocallahan.org<mailto:robert@ocallahan.org>> wrote:
On Tue, Oct 7, 2014 at 11:10 PM, Behdad Esfahbod <behdad@google.com<mailto:behdad@google.com>> wrote:
On Tue, Oct 7, 2014 at 10:37 PM, Robert O'Callahan <robert@ocallahan.org<mailto:robert@ocallahan.org>> wrote:
On Tue, Oct 7, 2014 at 1:36 AM, Behdad Esfahbod <behdad@google.com<mailto:behdad@google.com>> wrote:
Robert, Jonathan, are you willing to support this in Firefox?

I'm not sure what exactly your proposal is. As I understand it, you're proposing to allow each SVG document to be optionally, independently compressed via zlib.

I was thinking gzip instead of zlib, since gzip-compressed svg is in common use as sgvz.

How does the UA distinguish compressed documents from not-compressed documents?

If the data stream starts with 0x1f 0x8b (gzip signature), then process as svgz, otherwise process as svg.

That sounds reasonable.

The gzip header contains the uncompressed data size.

Great point.  Thanks Rob.  The *last* four bytes of the gzip-compressed data is the uncompressed size.


Doesn't that mean concerns about knowing the uncompressed size are already addressed?

I hope so.  Sairus, Leonard, does that address your concerns?

Rob