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v0.20 Bugs

 
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romero126



Joined: 24 Dec 2005
Posts: 200
PostPosted: Thu Jun 08, 2006 7:54 am    Post subject: v0.20 Bugs Reply with quote
Printing screen to an image

Code:
-- Pre Image
screen:clear(Color.new(0, 0, 0))
screen:print(0, 264, "I have text here", Color.new(255,255,255))
screen.waitVblankStart()
screen.flip()


-- Copy Preimage offset by 8 and place back down.
img = Image.createEmpty(480, 272)      -- Create image
img:clear(Color.new(0, 0, 0))         -- Clean image
img:blit(0, 0, screen, 0, 8, 480, 272, true)   -- Copy screen
screen:clear(Color.new(0, 0, 0))      -- Clear screen
screen:blit(0, 0, img, 0, 0, 480, 272, true)   -- Blit image
screen.waitVblankStart()
screen.flip()               -- Display


The error is the img is being cleared when I clear the screen.
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LuMo



Joined: 21 Aug 2005
Posts: 410
Location: Austria
PostPosted: Thu Jun 08, 2006 7:04 pm    Post subject: Reply with quote
sorry to nag... why would someone do this?

o) you can create a copy of your backbuffer (which is what should be on screen...)
o) if you mean png file with ... image then just do a screenshot...
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Shine



Joined: 03 Dec 2004
Posts: 728
Location: Germany
PostPosted: Thu Jun 08, 2006 11:58 pm    Post subject: Re: v0.20 Bugs Reply with quote
I didn't tried it, but looks like you are copying the wrong screen. There are 2 screens: the visible screen and the backbuffer. Copying from screen to image uses the backbuffer. Let me know, if you have still the error when copying the backbuffer, then I'll check it on my PSP.
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romero126



Joined: 24 Dec 2005
Posts: 200
PostPosted: Fri Jun 09, 2006 4:51 am    Post subject: Reply with quote
Actually i tried the other screen as well by using screen.flip() before the copying even starts and it still doesnt copy.
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Shine



Joined: 03 Dec 2004
Posts: 728
Location: Germany
PostPosted: Fri Jun 09, 2006 5:11 am    Post subject: Reply with quote
Do you have some non-working example? I've removed your screen.flip and this works with Lua Player 0.20:

Code:

screen:clear(Color.new(0, 0, 0))
screen:print(0, 264, "I have text here", Color.new(255,255,255))
img = Image.createEmpty(480, 272)
img:clear(Color.new(0, 0, 0))
img:blit(0, 0, screen, 0, 8, 480, 272, true)
screen:clear(Color.new(0, 0, 0))
screen:blit(0, 0, img, 0, 0, 480, 272, true)
screen.waitVblankStart()
screen.flip()

while true do
   screen.waitVblankStart()
   if Controls.read():start() then break end
end


But it may be better to use an offscreen image, because then you don't have to think about what to copy from and to screen and which problems with flip can occur, if you don't manage on-screen and off-screen the right way.
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