Re: [pygame] Pygame surface

[Weeble <clockworksaint@xxxxxxxxx>]

If you save to a file-like object, it will be in TGA format. Your
filename hint when loading (iname) needs to end in ".tga". TGA format
isn't compressed, so there's not a lot of value doing this compared to
doing fromstring/tostring. If you want use JPEG format your options
are to use a temporary file on disk, or to use a library like PIL. I
don't think pygame gives you any other way.

On 10 September 2014 08:14, diliup gabadamudalige <diliupg@xxxxxxxxx> wrote:
> Thank you for the response Peter. Pygame image to string code below
>
> def displayscreen():
>     ## image_filename = str(va.page) + ".jpeg"  # va.page is the current
> page no
>     filename = "zxs" + str(va.page) + ".ada"
>     ## images are saved in runs.py and to use it storeno = 2
>     image2blit = getfrompy.main(filename, storeno = 2)
>     if image2blit == None:
>         ## no image saved in file so draw the screen with make_screen_text
>         make_screen_text()
>         ## now grab the screen
>         screen = SCREEN.subsurface(0, 0, SCREENW, SCREENH)
>         ## convert to string
>         screenstr = pygame.image.tostring(screen, "RGBA", Falsey)
>         ## nowencode and write to dict in runs.py
>         strA = XOR(screenstr, coder)
>         str1 = base64.b64encode(strA)
>         scrnstore [filename] = str1
>         image2blit = pygame.image.frombuffer(screenstr, ( SCREENW, SCREENH
> ), 'RGBA')
>     va.getscr = True
>     return image2blit
>
> this code took too long to convert back and fourth. around 6 seconds.
>
>             screen = SCREEN.subsurface(0, 0, SCREENW, SCREENH)
>             image2blit = pygame.Surface.convert_alpha(screen)
>             memsave = StringIO()
>             pygame.image.save(image2blit, memsave)
>             memsave.seek(0)
>             pygame.image.load(memsave, iname)  <- code crashes here
>             strA = XOR(iname, coder)
>             str1 = base64.b64encode(strA)
>             scrnstore [filename] = str1
>
> the above code crashes at the point marked with the message pygame.error:
> unsupported image format. What I want to do is to grab the screen surface,
> convert it to a string format and save to a dictionary.
> The dictionary will be pickled and saved to a file.
> I want all my images in this file and NOT AS IMAGE FILES ON DISK.
> Please help to resolve this.
>
>
>
>
>
> On Wed, Sep 10, 2014 at 10:05 AM, Peter Shinners <pete@xxxxxxxxxxxx> wrote:
>>
>> On 09/09/2014 04:57 AM, diliup gabadamudalige wrote:
>>>
>>>
>>> How can a Pygame surface be converted to an image file say a jpeg or a
>>> png WITHOUT writing the file to disk? Say after a screen grab?
>>>
>>
>>
>> It is not highly documented, but you can pass a file-like object to
>> pygame.image.save. So instead of a filename you could create a StringIO
>> buffer and write into that. Or you could use something crazy like an html
>> post request and upload directly to a website.
>>
>> If you are trying to load the image into a different library, it will be
>> easier to use the "tobuffer" or "tostring" methods on the Surface. Then hope
>> the other library you are using has a fromstring, frombuffer, or fromdata
>> style function.
>>
>>
>
>
>
> --
> Diliup Gabadamudalige
>
> http://www.diliupg.com
> http://soft.diliupg.com/
>
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