Re: Help: with create a surface from my own RGBA data
Cool! Thats great. Can't wait to see the results. Be sure to do an update() based on the rect given. On Apr 5, 2012 4:04 PM, "agraham" wrote: > On 04/05/2012 06:02 PM, Tobias Leich wrote: > >> Hi, do you know the pixel format of the data you have? >> >> Do you get scanlines that you wanna pass to an SDL::Surface? Or do you >> get just the whole image? >> >> May I invite you to irc? Would be much easier than mails... #sdl at >> irc.perl.org. >> >> Cheers, FROGGS >> >> > Hi FROGGS, > > I was on IRC and got a lot of help, thank you. > > The data is RAW BGR/RGB or RGBA data from the network i.e. VNC rectangle > packets. > > The problem I had was it was not obvious how to put this "raw" data into a > surface so that it could be blitted. > > The solution (thanks to Scott Walters) was to get the get_pixels_ptr and > fill the area of the surface directly as follows: > >$pixels_ptr=$surface->get_**pixels_ptr(); >substr $$pixels_ptr, 0, length($data), $data; > > # $data=raw RGB data. > > I hope this information helps others. > > Albert > > > > >
Re: Help: with create a surface from my own RGBA data
On 04/05/2012 06:02 PM, Tobias Leich wrote: Hi, do you know the pixel format of the data you have? Do you get scanlines that you wanna pass to an SDL::Surface? Or do you get just the whole image? May I invite you to irc? Would be much easier than mails... #sdl at irc.perl.org. Cheers, FROGGS Hi FROGGS, I was on IRC and got a lot of help, thank you. The data is RAW BGR/RGB or RGBA data from the network i.e. VNC rectangle packets. The problem I had was it was not obvious how to put this "raw" data into a surface so that it could be blitted. The solution (thanks to Scott Walters) was to get the get_pixels_ptr and fill the area of the surface directly as follows: $pixels_ptr=$surface->get_pixels_ptr(); substr $$pixels_ptr, 0, length($data), $data; # $data=raw RGB data. I hope this information helps others. Albert
Re: Help: with create a surface from my own RGBA data
Hi, do you know the pixel format of the data you have? Do you get scanlines that you wanna pass to an SDL::Surface? Or do you get just the whole image? May I invite you to irc? Would be much easier than mails... #sdl at irc.perl.org. Cheers, FROGGS Am 03.04.2012 22:12, schrieb agraham: > Hi Guys, > > I am a complete Perl-SDL "newbie" and have spent a few days reading > the docs on CPAN perl-SDL. I'm using version 2.536. > > I would like to create a surface from my own RGBA data and there seems > to be no way to do that unless you do it a pixel at a time :( > > I am trying to hack Net::VNC so that it uses SDL:: instead of > Image::Imlib2, so for example: > > The "raw encoding" from Net::VNC does this: > > $socket->read( my $data, $w * $h * 4 ); > my $raw = Image::Imlib2->new_using_data( $w, $h, $data ); > $raw->has_alpha(0); > $image->blend( $raw, 0, 0, 0, $w, $h, $x, $y, $w, $h ); > > I need to replicate the above in perl-SDL > > There is an map_RGBA function which maps 1 pixel, but not a bunch of > them, so you can do: > > $dpixel=SDL::Video::map_RGBA( $display->format, 0, 0, 255); > > but not this: > > $dpixel=SDL::Video::map_RGBA( $display->format, $data); > SDL::Video::fill_rect( $surface, $srect, $dpixel ); > > I tried using SDL::RWOps as follows: > > $rw = SDL::RWOps->new_const_mem( $data); > > but I don't know how to get $rw into the surface! > > and > $surface = SDL::Image::load( $rw ); > does not work. > > Any help would be much appreciated. > > Albert
Help: with create a surface from my own RGBA data
Hi Guys, I am a complete Perl-SDL "newbie" and have spent a few days reading the docs on CPAN perl-SDL. I'm using version 2.536. I would like to create a surface from my own RGBA data and there seems to be no way to do that unless you do it a pixel at a time :( I am trying to hack Net::VNC so that it uses SDL:: instead of Image::Imlib2, so for example: The "raw encoding" from Net::VNC does this: $socket->read( my $data, $w * $h * 4 ); my $raw = Image::Imlib2->new_using_data( $w, $h, $data ); $raw->has_alpha(0); $image->blend( $raw, 0, 0, 0, $w, $h, $x, $y, $w, $h ); I need to replicate the above in perl-SDL There is an map_RGBA function which maps 1 pixel, but not a bunch of them, so you can do: $dpixel=SDL::Video::map_RGBA( $display->format, 0, 0, 255); but not this: $dpixel=SDL::Video::map_RGBA( $display->format, $data); SDL::Video::fill_rect( $surface, $srect, $dpixel ); I tried using SDL::RWOps as follows: $rw = SDL::RWOps->new_const_mem( $data); but I don't know how to get $rw into the surface! and $surface = SDL::Image::load( $rw ); does not work. Any help would be much appreciated. Albert
