Replace for loop by memset

Author: Brianum

png2xyz/src/png2xyz.cpp

@@ -204,6 +204,7 @@ int main(int argc, char* argv[]) {
 		png_get_PLTE(png_ptr, info_ptr, &palette, &num_palette);
 
 		xyz_data = new unsigned char[768 + width * height];
+		memset(xyz_data, 0, 768);
 
 		// Create XYZ palette
 		for (size_t i = 0; i < num_palette; i++) {
@@ -212,13 +213,6 @@ int main(int argc, char* argv[]) {
 			xyz_data[i * 3 + 2] = palette[i].blue;
 		}
 
-		// Create dummy palette entries, if PNG palette has less than 256 colors
-		for (size_t i = num_palette; i < 256; i++) {
-			xyz_data[i * 3] = 0;
-			xyz_data[i * 3 + 1] = 0;
-			xyz_data[i * 3 + 2] = 0;
-		}
-
 		// Get image rows
 		row_pointers = png_get_rows(png_ptr, info_ptr);