shithub: npe

Info  •  Files  •  Log

sdl2: scale mouse movements according to zoom

--- a/libnpe_sdl2/_sdl.h

+++ b/libnpe_sdl2/_sdl.h

@@ -17,6 +17,7 @@

 	int mredraw;

 	int fullredraw;

 	int textinput;

+	float scale;

 };

 enum {

--- a/libnpe_sdl2/events.c

+++ b/libnpe_sdl2/events.c

@@ -107,8 +107,8 @@

 	case Cmouse:

 		memset(e, 0, sizeof(*e));

-		e->motion.x = npe_sdl.m.xy.x - screen->r.min.x;

-		e->motion.y = npe_sdl.m.xy.y - screen->r.min.y;

+		e->motion.x = (npe_sdl.m.xy.x - screen->r.min.x) * npe_sdl.scale;

+		e->motion.y = (npe_sdl.m.xy.y - screen->r.min.y) * npe_sdl.scale;

 		if(!eqpt(npe_sdl.m.xy, npe_sdl.om.xy)){

 			npe_sdl.mredraw = 1;

 			if(npe_sdl.m.buttons == npe_sdl.om.buttons){

--- a/libnpe_sdl2/sdl2.c

+++ b/libnpe_sdl2/sdl2.c

@@ -70,6 +70,7 @@

 		goto err;

 	if(npe_sdl_init_input() != 0)

 		goto err;

+	npe_sdl.scale = 1;

 	return 0;

 err:

@@ -629,6 +630,8 @@

 		logiw = physw;

 		logih = physh;

 	}

+

+	npe_sdl.scale = (float)logiw / (float)physw;

 	if(!npe_sdl.fullredraw && (npe_sdl.fullredraw = memcmp(backcopy, byteaddr(back, ZP), logiw*logih*4)) == 0 && !npe_sdl.mredraw)

 		return;