1 files changed, 33 insertions, 0 deletions
diff --git a/src/components/rle/RleDecoder.h b/src/components/rle/RleDecoder.h
new file mode 100644
index 00000000..0f607fb8
--- /dev/null
+++ b/src/components/rle/RleDecoder.h
@@ -0,0 +1,33 @@
+#pragma once
+
+#include <cstdint>
+#include <cstddef>
+
+namespace Pinetime {
+  namespace Tools {
+    /* 1-bit RLE decoder. Provide the encoded buffer to the constructor and then call DecodeNext() by
+     * specifying the output (decoded) buffer and the maximum number of bytes this buffer can handle.
+     *
+     * Code from https://github.com/daniel-thompson/wasp-bootloader by Daniel Thompson released under the MIT license.
+     */
+    class RleDecoder {
+    public:
+      RleDecoder(const uint8_t* buffer, size_t size);
+      RleDecoder(const uint8_t* buffer, size_t size, uint16_t foregroundColor, uint16_t backgroundColor);
+
+      void DecodeNext(uint8_t* output, size_t maxBytes);
+
+    private:
+      const uint8_t* buffer;
+      size_t size;
+
+      int encodedBufferIndex = 0;
+      int y = 0;
+      uint16_t bp = 0;
+      uint16_t foregroundColor = 0xffff;
+      uint16_t backgroundColor = 0;
+      uint16_t color = backgroundColor;
+      int processedCount = 0;
+    };
+  }
+}