Thanks for reply. Yes, frames should actually be renamed to something more generic (array element? page? resourceCount? - i couldn’t find the right name yet). Actually, DDS doesn’t support animation, but it supports texture arrays which should be implemented using "frames".
I didn’t think about reading pdf files as an image, but why not… Thumbnails seems pretty close to mipmaps. Can there be multiple thumbnails of the different size for a page? Иван Комиссаров 19 мая 2015 г., в 21:12, Rutledge Shawn <[email protected]> написал(а): > I think the new API should have multi-page support. It would be useful for > pdf, djvu, multi-page tiff, and for looking at individual frames of animated > gif, png, etc., to the extent that we write plugins for those. > > I wrote a QQuickImageProvider for PDF (using poppler), but requestImage takes > only an “id” string to identify the image. So I had to make up a composite > id containing both the filename and the page number. (much like a URL format > would be, if you had to request multiple pages from a web server) So that’s > the next API that needs to have some support for paging. > > Can “frame” be considered the same as “page”? But I see that you also have a > subimage concept in mind. > > Sometimes (as in icon files, or in any kind of file that also includes a > smaller preview image) the sub images would be the same thing at different > resolution, right? That is orthogonal to the idea of paging: a PDF file can > have multiple pages, and also embedded thumbnails for each page. In order > for an image format plugin to be enough to write a PDF reader application, it > would need to support paging, and also getting the thumbnails for the pages. > > In QQuickImageProvider::requestImage, requestedSize can also be given. So > that’s one way to specify a thumbnail: if the available thumbnail is near > enough to requestedSize, return that instead. The API anyway does not > guarantee that you get exactly the size that you ask for. > > Eventually we could get to the point that a plain Image in QML could be used > as a PDF viewer, all by itself. It would also need a paging API. > > _______________________________________________ Development mailing list [email protected] http://lists.qt-project.org/mailman/listinfo/development
