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Support ESP+u8g2 with optional bitswap

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Somewhere (SPI Interface?) there is a MSB/LSB swap when using the converter with ESP32 and the U8g2 library 
which distorts the output.
I checked with 1bit per pixel output but added an optional bitswap checkbox, a function to do optinal swap and 
added it to all output functions.
The lvgl online converter has got the same problem. Maybe there is is something wrong with the u8g...
Since endian is a traditional an generic issue I thought it's probably a nice feature inside the converter 
which at least works fine for me.
This commit is contained in:
plewka
2021-11-24 11:10:21 +01:00
committed by GitHub
parent 02d487f6c4
commit a30a5c4c6b
1 changed files with 21 additions and 5 deletions
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index.html
+21 -5
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@@ -342,6 +342,13 @@
<label for="flipVertically">vertically</label>
</div>
</div>
<div class="table-row">
<div class="table-cell"><label for="bitswap">Swap Bits in Byte</label></div>
<div class="table-cell">
<input id="bitswap" type="checkbox" onchange="updateBoolean('bitswap')">
</div>
</div>
</div>
<div class="note">
<i>Note: centering the image only works when using a canvas larger than the original image.</i>
@@ -474,7 +481,7 @@
// When we have the complete 8 bits, combine them into a hex value
if(byteIndex < 0){
var byteSet = number.toString(16);
var byteSet = bitswap(number).toString(16);
if(byteSet.length == 1){ byteSet = "0"+byteSet; }
var b = "0x"+byteSet;
output_string += b + ", ";
@@ -509,7 +516,7 @@
}
byteIndex--;
}
var byteSet = number.toString(16);
var byteSet = bitswap(number).toString(16);
if (byteSet.length == 1){ byteSet = "0"+byteSet; }
var b = "0x"+byteSet.toString(16);
output_string += b + ", ";
@@ -540,7 +547,7 @@
var firstByte = (rgb >> 8) & 0xff;
var secondByte = rgb & 0xff;
var byteSet = rgb.toString(16);
var byteSet = bitswap(rgb).toString(16);
while(byteSet.length < 4){ byteSet = "0" + byteSet; }
output_string += "0x" + byteSet + ", ";
@@ -570,7 +577,7 @@
var firstByte = (rgb >> 8) & 0xff;
var secondByte = rgb & 0xff;
var byteSet = rgb.toString(16);
var byteSet = bitswap(rgb).toString(16);
while(byteSet.length < 8){ byteSet = "0" + byteSet; }
output_string += "0x" + byteSet + ", ";
@@ -608,7 +615,7 @@
// When we have the complete 8 bits, combine them into a hex value
if(byteIndex < 0){
var byteSet = number.toString(16);
var byteSet = bitswap(number).toString(16);
if(byteSet.length == 1){ byteSet = "0"+byteSet; }
var b = "0x"+byteSet;
output_string += b + ", ";
@@ -1380,6 +1387,15 @@
return "unsigned char";
}
}
function bitswap(b) {
if(settings["bitswap"])
{
b = (b & 0xF0) >> 4 | (b & 0x0F) << 4;
b = (b & 0xCC) >> 2 | (b & 0x33) << 2;
b = (b & 0xAA) >> 1 | (b & 0x55) << 1;
}
return b;
}
// --
document.getElementById("outputFormat").value = "arduino";