Hi,
> Maintaining N rows is an implementation detail of the scaler. I mean by
> having a simple one-scanline-in, zero-or-more-scanlines-out interface, like
> this:
>
> scaler.setSourceSize(10, 10);
> scaler.setDestSize(100, 100);
> while (decoder.hasMoreScanines()) {
> scaler.supplyScanLine(deco
2012/8/13 Ilyes Gouta
> Hi,
>
> >>> If such a callback API for row-based resizing comes to fruition, then
> >>> let's (also) not rule out whole-picture h/w accelerated resizing -
> >>> such as by making that new API a mandatory stage in the decoding
>
> that's actually: such as by *not* making th
Hi,
>>> If such a callback API for row-based resizing comes to fruition, then
>>> let's (also) not rule out whole-picture h/w accelerated resizing -
>>> such as by making that new API a mandatory stage in the decoding
that's actually: such as by *not* making that new API a mandatory
stage in the
I agree we should have a separate row-based downscaling phase.
JPEGImageDecoder.cpp already supports downscaling with a given width and
height, but it's using point sampling which has poor quality. It would be
nice to have a callback based downscaling API that we can implement better
algorithms.
Hi,
On Mon, Aug 13, 2012 at 3:46 PM, Anton Obzhirov wrote:
> Libjpeg has some internal support for downscaling already (2x, 4x). Not sure
> about
>
> Libpng and other libraries. In general probably it can be implemented by
> downscaling decoded row of the pixels on the fly using callback API
>
-
From: Ilyes Gouta [mailto:ilyes.go...@gmail.com]
Sent: 13 August 2012 15:37
To: Anton Obzhirov
Cc: webkit-dev@lists.webkit.org
Subject: Re: [webkit-dev] image downscaling during decoding
Hi,
> At the moment such images are full decoded to a full size buffer and get
downscaled during render
Libjpeg has some internal support for downscaling already (2x, 4x). Not sure
about
Libpng and other libraries. In general probably it can be implemented by
downscaling decoded row of the pixels on the fly using callback API
provided.
From: tomhud...@google.com [mailto:tomhud...@google.com] O
On Monday 13 August 2012, Anton Obzhirov wrote:
> Hi,
>
> We are looking for ways to improve page loading speed and reduce memory
> usage for WebKit in general and for GTK port of WebKit in particular. One
> of the ideas is to implement downscaling of the images during decoding for
> image element
Hi,
> At the moment such images are full decoded to a full size buffer and get
> downscaled during rendering.
WebKit has already a hard coded
ImageSource::s_maxPixelsPerDecodedImage value, in
WebCode/platform/graphics/ImageSource.cpp which defaults to 1024 *
1024 when WebKit's option ENABLE(IMAG
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