Do not include ZLIB header or checksum bytes in compressed glyphs

lib/EpdFont/scripts/fontconvert.py

@@ -241,7 +241,8 @@ for i_start, i_end in intervals:
 
         # Build output data
         packed = bytes(pixels)
-        compressed = zlib.compress(packed)
+        # DEFLATE compressed data without zlib header/footer
+        compressed = zlib.compress(packed, wbits=-15)
         is_compressed = len(compressed) < len(packed) * 0.9
         # Use compressed data only if it's at least 10% smaller
         if is_compressed:

lib/GfxRenderer/GfxRenderer.cpp

@@ -17,7 +17,7 @@ bool inflateOneShot(const uint8_t* inputBuf, const size_t deflatedSize, uint8_t*
   size_t inBytes = deflatedSize;
   size_t outBytes = inflatedSize;
   const tinfl_status status = tinfl_decompress(inflator, inputBuf, &inBytes, nullptr, outputBuf, &outBytes,
-                                               TINFL_FLAG_PARSE_ZLIB_HEADER | TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF);
+                                               TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF);
   free(inflator);
 
   if (status != TINFL_STATUS_DONE) {