Expose zstd and zlib compression levels as global config.

core/global_config.cpp

@@ -39,6 +39,8 @@
 #include "os/os.h"
 #include "variant_parser.h"
 
+#include <zlib.h>
+
 #define FORMAT_VERSION 3
 
 GlobalConfig *GlobalConfig::singleton = NULL;
@@ -967,6 +969,12 @@ GlobalConfig::GlobalConfig() {
 	custom_prop_info["physics/2d/thread_model"] = PropertyInfo(Variant::INT, "physics/2d/thread_model", PROPERTY_HINT_ENUM, "Single-Unsafe,Single-Safe,Multi-Threaded");
 
 	GLOBAL_DEF("debug/profiler/max_functions", 16384);
+
+	GLOBAL_DEF("compression/zstd_compression_level", 3);
+	custom_prop_info["compression/zstd_compression_level"] = PropertyInfo(Variant::INT, "compression/zstd_compression_level", PROPERTY_HINT_RANGE, "1,22,1");
+	GLOBAL_DEF("compression/zlib_compression_level", Z_DEFAULT_COMPRESSION);
+	custom_prop_info["compression/zlib_compression_level"] = PropertyInfo(Variant::INT, "compression/zlib_compression_level", PROPERTY_HINT_RANGE, "-1,9,1");
+
 	using_datapack = false;
 }
 

core/io/compression.cpp

@@ -28,7 +28,7 @@
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
 /*************************************************************************/
 #include "compression.h"
-
+#include "global_config.h"
 #include "os/copymem.h"
 #include "zip_io.h"
 
@@ -37,8 +37,6 @@
 
 #include <zlib.h>
 
-#define ZSTD_DEFAULT_COMPRESSION 3
-
 int Compression::compress(uint8_t *p_dst, const uint8_t *p_src, int p_src_size, Mode p_mode) {
 
 	switch (p_mode) {
@@ -60,7 +58,8 @@ int Compression::compress(uint8_t *p_dst, const uint8_t *p_src, int p_src_size,
 			strm.zalloc = zipio_alloc;
 			strm.zfree = zipio_free;
 			strm.opaque = Z_NULL;
-			int err = deflateInit(&strm, Z_DEFAULT_COMPRESSION);
+			int level = GLOBAL_GET("compression/zlib_compression_level");
+			int err = deflateInit(&strm, level);
 			if (err != Z_OK)
 				return -1;
 
@@ -82,7 +81,8 @@ int Compression::compress(uint8_t *p_dst, const uint8_t *p_src, int p_src_size,
 		case MODE_ZSTD: {
 
 			int max_dst_size = get_max_compressed_buffer_size(p_src_size, MODE_ZSTD);
-			return ZSTD_compress(p_dst, max_dst_size, p_src, p_src_size, ZSTD_DEFAULT_COMPRESSION);
+			int level = GLOBAL_GET("compression/zstd_compression_level");
+			return ZSTD_compress(p_dst, max_dst_size, p_src, p_src_size, level);
 		} break;
 	}