how to convert PNG image to C array

[patricegamakuoh]

How can I get PNG image converted into the C array to use with the lovyanGFX library as shown in this example?
[https://github.com/lovyan03/LovyanGFX/tree/master/examples/Sprite/PartyParrot]
https://github.com/lovyan03/LovyanGFX/tree/master/examples/Sprite/PartyParrot

is there a special converter or any suggestions regarding how to get my image into this format? as I'm not using an SD card,
thanks in advance!

[ciniml]

You can use xxd command if you are using Linux or WSL on Windows.

$ xxd -i foo.png foo.h

The file foo.h contains C style array which represents the contents of foo.png

[patricegamakuoh]

thanks for the quick feedback @ciniml I have done the convertion with linux to get the resulting .h file then replaced the hex string with one of the parrot array in this code: https://github.com/lovyan03/LovyanGFX/tree/master/examples/Sprite/PartyParrot but nothing shows in the screen,,,

The size of my image is 319.7kb , the final .h array legnth is 319722,
the display screen is 480x320

Am i missing something?

[tobozo]

@patricegamakuoh it's hard to say without seeing the actual code and the original image (please create a gist)

some questions come to mind though:

• party parrot code uses bmp format but you mention png, did you adapt the functions?
• sprite size is capped by memory, have you tried with smaller images, different formats?
• screen rotation may affect rendering, have you tried different orientations?

[patricegamakuoh]

Thanks @tobozo you are right , i have converted to .bmp and it works well with @ciniml mentioned convertion method.

Another probblem now is the color performance , it does not seems to show the right image as expected .

how can i get the right image color output or what am i missing?
thanks !

Original image

Final output image

[tobozo]

oh geez :)

it's still hard to say without seeing the actual code, but looking at RGB/BGR situation I'd try to use tft.setSwapBytes( bool ) and/or sprite[x].setSwapBytes( bool )

[patricegamakuoh]

thanks @tobozo the prolblem was related to color inverter , and i just need to set the inverter paramater to true in the source code .