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Ian_lett Newbie Joined: 21/08/2020 Location: United KingdomPosts: 6
Posted: 10:22am 07 Oct 2020
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Ian_lett Newbie Joined: 21/08/2020 Location: United KingdomPosts: 6
Posted: 10:33am 07 Oct 2020
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Hi
i have a png file that’s 750x750, and about 503k, contain my sprites i create a frame buffer of the same size or larger, and try to load the png file into it and i am getting the error message not enough heap memory.
i have also tried to load it directly to a mode 9 (1024x768) screen and got the same error and if i cut the sheet into 2 i can load the first half and create all my sprites from it, but get the error message when i attempt to load the second half of the sprites set.
is there a physical file size limit or a way to increase the heap?
regards ian
matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10582
Posted: 10:49am 07 Oct 2020
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Unfortunately decoding PNG files is very inefficient when it comes to memory. Nothing can be done about this. Suggest you load it in smaller bits.
MauroXavier Guru Joined: 06/03/2016 Location: BrazilPosts: 303
Posted: 10:50am 07 Oct 2020
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The PNG file is a compressed file format and consumes RAM to be decoded on the framebuffer.
I had the same problem trying to fill a large framebuffer, and it solved using a single BMP file in RGB888 format (it will not work if use other formats).
The file size is bigger than PNG and will load a little slower, but will fix the problem. Edited 2020-10-07 20:53 by MauroXavier
Ian_lett Newbie Joined: 21/08/2020 Location: United KingdomPosts: 6
Posted: 03:45pm 07 Oct 2020
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Many thanks,
its working now, but i have lost the trasparency and all my sprites now have black borders, how do i set the black area to transparent, as i cant see how to do this.
MauroXavier Guru Joined: 06/03/2016 Location: BrazilPosts: 303
Posted: 03:59pm 07 Oct 2020
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Have you tried using full black RGB (0,0,0) as a transparent color?
matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10582
Posted: 04:04pm 07 Oct 2020
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PNG should also work if you load smaller images at a time
elk1984 Senior Member Joined: 11/07/2020 Location: United KingdomPosts: 229
Posted: 04:18pm 07 Oct 2020
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I'm sure I've missed this somewhere, but does sprite always assume RGB(0,0,0) as transparent? I've had a few cases where I don't want transparency but when using sprite read / write black is changed to transparent.
Ian_lett Newbie Joined: 21/08/2020 Location: United KingdomPosts: 6
Posted: 10:17am 10 Oct 2020
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thanks for the help so far.
the bmp background is RGB(0,0,0), so how do i set this as transparent from basic ?
Notice. New forum software under development. It's going to miss a few functions and look a bit ugly for a while, but I'm working on it full time now as the old forum was too unstable. Couple days, all good. If you notice any issues, please contact me.
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