Add integerscale option

src/sdl_core.h

@@ -44,6 +44,7 @@ extern void sdl_getWindowInfo(DispInfo *info);
 extern void sdl_setFullscreen(boolean on);
 extern boolean sdl_isFullscreen(void);
 extern agsurface_t *sdl_getDIB(void);
+extern void sdl_setIntegerScaling(boolean bool);
 
 /* 画面更新 */
 extern void sdl_updateArea(MyRectangle *src, MyPoint *dst);

src/sdl_video.c

@@ -41,6 +41,7 @@ static void makeDIB(int width, int height, int depth);
 
 struct sdl_private_data *sdl_videodev;
 static int joy_device_index = -1;
+static boolean integer_scaling = FALSE;
 
 #ifdef HAVE_SDLJOY
 static SDL_Joystick *js;
@@ -158,6 +159,7 @@ static void window_init(void) {
 								  SYS35_DEFAULT_WIDTH, SYS35_DEFAULT_HEIGHT,
 								  flags);
 	sdl_renderer = SDL_CreateRenderer(sdl_window, -1, 0);
+	SDL_RenderSetIntegerScale(sdl_renderer, integer_scaling);
 }
 
 static void makeDIB(int width, int height, int depth) {
@@ -275,6 +277,10 @@ void sdl_setJoyDeviceIndex(int index) {
 	joy_device_index = index;
 }
 
+void sdl_setIntegerScaling(boolean bool) {
+	integer_scaling = bool;
+}
+
 #ifdef __EMSCRIPTEN__
 
 void* EMSCRIPTEN_KEEPALIVE sdl_getDisplaySurface() {

src/xsystem35.c

@@ -147,6 +147,7 @@ static void sys35_usage(boolean verbose) {
 #endif  
 	puts(" -noantialias   : never use antialiased string");
 	puts(" -fullscreen    : start with fullscreen");
+	puts(" -integerscale  : use integer scaling when resizing");
 	puts(" -noimagecursor : disable image cursor");
 	puts(" -version       : show version");
 	puts(" -h             : show this message");
@@ -332,6 +333,8 @@ static void sys35_ParseOption(int *argc, char **argv) {
 		} else if (0 == strcmp(argv[i], "-version")) {
 			puts(VERSION);
 			exit(0);
+		}  else if (0 == strcmp(argv[i], "-integerscale")) {
+			sdl_setIntegerScaling(TRUE);
 		}
 	}
 }
@@ -403,6 +406,13 @@ static void check_profile() {
 			nact->noimagecursor = TRUE;
 		}
 	}
+	/* enable integer scaling */
+	param = get_profile("integerscale");
+	if (param) {
+		if (0 == strcmp(param, "Yes")) {
+			sdl_setIntegerScaling(TRUE);
+		}
+	}
 }
 
 #ifdef HAVE_SIGACTION