On Wed, 23 Jul 2008 07:33:32 -0700 Colin D Bennett <[EMAIL PROTECTED]> wrote:
> On Wed, 23 Jul 2008 10:05:36 +0800 > Bean <[EMAIL PROTECTED]> wrote: > > > On Wed, Jul 23, 2008 at 3:06 AM, Colin D Bennett <[EMAIL PROTECTED]> > > wrote: > > > On Tue, 22 Jul 2008 14:48:31 -0400 > > > Pavel Roskin <[EMAIL PROTECTED]> wrote: > > > > > >> On Tue, 2008-07-22 at 08:43 -0700, Colin D Bennett wrote: > > >> > This patch speeds up loading a TGA image on my test system from > > >> > 29 seconds to approximately 1 second. > > >> > > > >> > I noticed that on my 1 GHz test system running from an IDE > > >> > CompactFlash drive, loading a certain TGA image in GRUB takes > > >> > about 29 seconds. > > >> > > >> I'm sorry for straying from your point, but maybe we should drop > > >> TGA support. It was the first image format for GRUB to support, > > >> but now PNG is supported, and it should be better in all aspects. > > > > > > I agree that TGA is not, in general, a great choice for an image > > > format (unless it is faster to load a large background image -- a > > > 1024x768 RGB PNG file may take more time to decompress than a TGA > > > image would take to load -- although perhaps an uncompressed PNG > > > file would be comparable in speed to load). However, I have not > > > been able to load any PNG images that I have tried to use. > > > Something about the chunk type not being supported. > > > > > > > Hi, > > > > Please upload the png file that cause problem. > > > > Also note that png use DEFLATE compression. I write a decoder in > > png, which may be a little slow. Perhaps I can import the decoder > > from zlib, if copyright allows. > > Ok, after some more testing, I have found that if I create PNG images > with ImageMagick or The GIMP, they work. However, I have an image > that I was trying to use as a GRUB background which is from a MythTV > theme called Titivillus. The PNG file from the MythTV theme doesn't > load in GRUB. I get the message "error: png: block type fixed not > supported". Oops! After more testing, I have found PNG images that I saved in The GIMP which also refuse to load due to the "block type fixed not supported" error. One ZIP file [1] contains images that all fail to load in GRUB with that error, and the other [2] contains similar images that load just fine. [1] gibibit.com/upload/grub-png-bad.zip [2] gibibit.com/upload/grub-png-good.zip Regards, Colin
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