v0.20 Bugs

[romero126]

Printing screen to an image

Code: Select all

-- 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.

[LuMo]

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...

[Shine]

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.

[romero126]

Actually i tried the other screen as well by using screen.flip() before the copying even starts and it still doesnt copy.

[Shine]

Do you have some non-working example? I've removed your screen.flip and this works with Lua Player 0.20:

Code: Select all

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.