Minor ICN decode speed-up (#7395)

ihhub · Jul 8, 2023 · 8096359 · 8096359
1 parent a4fb51e
commit 8096359
Showing 1 changed file with 6 additions and 2 deletions.
diff --git a/src/engine/image_tool.cpp b/src/engine/image_tool.cpp
@@ -357,6 +357,7 @@ namespace fheroes2
 
                 memcpy( imageData + posX, data, pixelCount );
                 memset( imageTransform + posX, static_cast<uint8_t>( 0 ), pixelCount );
+
                 data += pixelCount;
                 posX += pixelCount;
             }
@@ -371,9 +372,10 @@ namespace fheroes2
                 ++data;
 
                 const uint8_t transformValue = *data;
-                const uint8_t transformType = static_cast<uint8_t>( ( ( transformValue & 0x3C ) << 6 ) / 256 + 2 ); // 1 is for skipping
+                const uint8_t transformType = static_cast<uint8_t>( ( ( transformValue & 0x3C ) >> 2 ) + 2 ); // 1 is for skipping
 
-                const uint32_t pixelCount = *data % 4 ? *data % 4 : *( ++data );
+                const uint32_t countValue = transformValue & 0x03;
+                const uint32_t pixelCount = ( countValue != 0 ) ? countValue : *( ++data );
 
                 if ( ( transformValue & 0x40 ) && ( transformType <= 15 ) ) {
                     memset( imageTransform + posX, transformType, pixelCount );
@@ -390,6 +392,7 @@ namespace fheroes2
 
                 memset( imageData + posX, *data, pixelCount );
                 memset( imageTransform + posX, static_cast<uint8_t>( 0 ), pixelCount );
+
                 posX += pixelCount;
 
                 ++data;
@@ -400,6 +403,7 @@ namespace fheroes2
 
                 memset( imageData + posX, *data, pixelCount );
                 memset( imageTransform + posX, static_cast<uint8_t>( 0 ), pixelCount );
+
                 posX += pixelCount;
 
                 ++data;