From 4b23b151bf51f27711941a472d9893d9c2e72e7f Mon Sep 17 00:00:00 2001
From: Clemens <41959005+Martinius79@users.noreply.github.com>
Date: Thu, 19 Sep 2024 10:31:55 +0200
Subject: [PATCH] Bugfix - Fix pallete size calculation (#87)

* Create cmake-multi-platform.yml

tryout1

* Update cmake-multi-platform.yml

* Update cmake-multi-platform.yml

* Update cmake-multi-platform.yml

* Update cmake-multi-platform.yml

* Update cmake-multi-platform.yml

* edited and renamed github action workflow file

* updated build definition

* fixing build definition

* Fixed calculation of palette size for most palletized bitmaps. 2^bitDepth instead of bitDepth*bitDepth. Calculation is needed because paletteSize in the DIB header is not filled correctly by the most image libs/tools, so 0 is read and calculation was wrong.
---
 EleksTubeHAX_pio/src/TFTs.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/EleksTubeHAX_pio/src/TFTs.cpp b/EleksTubeHAX_pio/src/TFTs.cpp
index 05dcf83..a990d91 100644
--- a/EleksTubeHAX_pio/src/TFTs.cpp
+++ b/EleksTubeHAX_pio/src/TFTs.cpp
@@ -270,7 +270,7 @@ bool TFTs::LoadImageIntoBuffer(uint8_t file_index) {
   {
     read32(bmpFS); read32(bmpFS); read32(bmpFS); // size, w resolution, h resolution
     paletteSize = read32(bmpFS);
-    if (paletteSize == 0) paletteSize = bitDepth * bitDepth; // if 0, size is 2^bitDepth
+    if (paletteSize == 0) paletteSize = pow(2, bitDepth); // if 0, size is 2^bitDepth
     bmpFS.seek(14 + headerSize); // start of color palette
     for (uint16_t i = 0; i < paletteSize; i++) {
       palette[i] = read32(bmpFS);