Add LICENSE

LICENSE

@@ -0,0 +1,24 @@
+allegro_qoi
+Copyright © 2025 Canithesis Interactive
+
+Uses code from qoi.h
+Copyright (c) 2022 Dominic Szablewski
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the "Software"),
+to deal in the Software without restriction, including without limitation
+the rights to use, copy, modify, merge, publish, distribute, sublicense,
+and/or sell copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice (including the next
+paragraph) shall be included in all copies or substantial portions of the
+Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.

allegro_qoi.c

@@ -36,7 +36,7 @@ ALLEGRO_BITMAP* _al_load_qoi_f(ALLEGRO_FILE* file, int flags) {
 	ALLEGRO_BITMAP* bmp = al_create_bitmap(meta.width, meta.height);
 	ALLEGRO_LOCKED_REGION* lock = al_lock_bitmap(
 		bmp, fmt,
-		ALLEGRO_LOCK_READWRITE
+		ALLEGRO_LOCK_WRITEONLY
 	);
 	al_set_new_bitmap_flags(oldflags);
 	if (!lock) return NULL;

sample.c

@@ -1,6 +1,6 @@
 // This program simply loads a QOI file into Allegro
 // as a texture and then dumps the texture data as a PNG.
-// Take notice of lines 26 and 27. You only need to initialize
+// Take notice of lines 32 and 33. You only need to initialize
 // the QOI plugin (this registers the function hooks that Allegro
 // will use whenever you want to I/O on a filename ending in .qoi)
 // 
@@ -21,10 +21,17 @@ int main(int argc, char **argv) {
 		printf("Usage: sample <filename>\n");
 		return 0;
 	}
+
 	al_init();
 	al_init_image_addon();
 	al_init_qoi();
+
+	// We don't want to multiply color by alpha because
+	// we're writing back to another image here, in a
+	// game you would leave this flag unset.
+	al_set_new_bitmap_flags(ALLEGRO_NO_PREMULTIPLIED_ALPHA);
 	ALLEGRO_BITMAP* bmp = al_load_bitmap(argv[1]);
+
 	al_save_bitmap("out.png", bmp);
 	return 0;
 }