Re: [ERRATUM] Memory issues to load a png image - any ideas?

384kg = 384kb

I also forgot to put the SRAM base address: 0x600A0000

Thanks.

Ulisses

Em qua, 3 de jul de 2019 às 09:36, Ulisses <[email protected]>
escreveu:

> Good day,
>
> I've been working on displaying a png image in a 480w x 272h display. The
> project I'm working on have 8Mbit external SRAM, being 512k for
> LCD_LAYER0_FRAME_BUFFER (which is the unique layer being used) and 128k for
> audio buffer.
>
> I have then 384kg left to work with png images, but I'm having "not enough
> memory" errors though. The image I'm trying to display have 1440 RowBytes
> and 272 Height (as stated before). A total of 391680 (image only) bytes, if
> the math is correct.
>
> I mapped the memory allocations, and got this:
>
> ------------------------------------------
> Bytes - Memory Addr - Description
> ------------------------------------------
> 600   - 0x600A034C  - png_ptr
> 2048  - 0x600A05B0  - png_ptr->zbuf
> 9520  - 0x600A0E60  - z_streamp strm
> 116   - 0x600A339C  - info_ptr
> 1508  - 0x600A341C  - png_ptr->big_row_buf
> 1441  - 0x600A3A0C  - png_ptr->prev_row
> -------------------------------------------
> Total allocated so far:
> 15233  bytes
>
> ----- NOT ALLOCATED DUE TO OVERFLOW:  -----
>
> Memory to store the image:
> 391680 bytes (overflow)
>
> Memory to allocate the array of row-pointers:
> 272    bytes
>
> Total allocation needed:
> 407185 bytes
>
> Total memory available:
> 393216 bytes
> -------------------------------------------
>
> As shown, the memory overflows when the allocation function tries to
> allocate the 391680 (image) bytes.
>
> Once it's the first time I'm working with compressed images, I'm a little
> lost:
>
>  - Is there a way to display this image, even if I have no enough memory
> to allocate it "at once"? (I mean, any buffering tricks or something like
> that to work around this?)
>
>  - If there is, could anyone shed some light on me and show me some
> implementation example for me to follow?
>
> Thank you.
>
> []'s
>

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