1 files changed, 39 insertions, 0 deletions
diff --git a/src/components/rle/RleDecoder.cpp b/src/components/rle/RleDecoder.cpp
new file mode 100644
index 00000000..19a90fda
--- /dev/null
+++ b/src/components/rle/RleDecoder.cpp
@@ -0,0 +1,39 @@
+#include "RleDecoder.h"
+
+using namespace Pinetime::Tools;
+
+RleDecoder::RleDecoder(const uint8_t *buffer, size_t size) : buffer{buffer}, size{size} {
+
+}
+
+RleDecoder::RleDecoder(const uint8_t *buffer, size_t size, uint16_t foregroundColor, uint16_t backgroundColor) : RleDecoder{buffer, size} {
+  this->foregroundColor = foregroundColor;
+  this->backgroundColor = backgroundColor;
+}
+
+
+void RleDecoder::DecodeNext(uint8_t *output, size_t maxBytes) {
+  for (;encodedBufferIndex<size; encodedBufferIndex++) {
+    uint8_t rl = buffer[encodedBufferIndex] - processedCount;
+    while (rl) {
+      output[bp] = color >> 8;
+      output[bp + 1] = color & 0xff;
+      bp += 2;
+      rl -= 1;
+      processedCount++;
+
+      if (bp >= maxBytes) {
+        bp = 0;
+        y += 1;
+        return;
+      }
+    }
+    processedCount = 0;
+
+    if (color == backgroundColor)
+      color = foregroundColor;
+    else
+      color = backgroundColor;
+  }
+}
+