ESP8266 with 240x240 sprites

[error105]

Hi, i want make gauges on my IPS GC9A01 with ESP8266 but propably the problem is with my ram. I want crate Sprites 240x240, how can i reduce my ColorDepth to show sprites with my 240x240 ?

`void createBackground() {
gaugeBack.createSprite(190, 190);
gaugeBack.setPivot(120, 120);
tft.setPivot(160, 120);
gaugeBack.fillSprite(TFT_TRANSPARENT);
gaugeBack.pushImage(0, 0, 240, 240, SpeedoWHT);

if (millis() >+ 5000){
gaugeBack.setTextColor(COLORS);
gaugeBack.setTextDatum(MC_DATUM);
gaugeBack.setTextSize(3);
gaugeBack.drawNumber(obroty, 120, 150, 1);
}`

[Bodmer]

An ESP8266 can only spare about 40kbytes for sprties. If you are using the WiFi and buffering data the spare RAM will be smaller.

A 1 bit per pixel sprite would require 240240/8 = 7200 bytes
A 4 bit per pixel sprite would require 240240/2 = 28,800 bytes
A 8 bit per pixel sprite would require 249x240 = 57,600 bytes

This means at best you can use a 4 bit sprite. This means you then have to use a colour palette.

See examples for setting bit depth and managing the palette. This example would be a good place to start, line 53 sets the colour depth.

[error105]

So, if im use Inkscape how i can export file in 4bit ?
And how convert png/jpg to 4 bit C in https://javl.github.io/image2cpp/ ?

Because when im change png to 4bit, and im set 4bit in program i dont see graphic :(

[Bodmer]

I am not familiar with inkscape so cannot help.

Kate Morris added the 4 bt sprite code and also created a python script that converts a BMP file to a 4 bit array. I have not used it so am unable to help but the python script is here:

https://github.com/Bodmer/TFT_eSPI/tree/master/Tools/bmp2array4bit

[error105]

After that i have just errorr when compiling :(
:
no matching function for call to 'TFT_eSprite::pushImage(int, int, int, int, const uint8_t [28800])'