osd, lua: remove weird OSD scaling

Do not scale OSD mouse input to the ASS OSD script resolution. The
original idea of this mechanism was that the user doesn't have to care
about the actual resolution of anything, and can just use the OSD
resolution consistently. But this made things worse.

Remove the implicit scaling, and always use the screen resolution.
(Except with --vo=xv, where additional scaling is forced upon
everything.)

Drop get_osd_resolution(). There is no replacement. Rename
get_screen_size() and get_screen_margins() to use "osd" instead of
"screen". For anything but --vo=xv these are equivalent, but with
--vo=xv the OSD resolution has additional implicit scaling.

Add code to osc.lua which emulates the old behavior.

Note that none of the changed functions were public API, so implicit
breakage of scripts which used it is just going to happen.

2 files changed, 40 insertions, 35 deletions

diff --git a/player/lua.c b/player/lua.c
index 9fe1d0deca..04c7dbb977 100644
--- a/player/lua.c
+++ b/player/lua.c
@@ -974,17 +974,7 @@ static int script_set_osd_ass(lua_State *L)
     return 0;
 }
 
-static int script_get_osd_resolution(lua_State *L)
-{
-    struct MPContext *mpctx = get_mpctx(L);
-    int w, h;
-    osd_object_get_resolution(mpctx->osd, OSDTYPE_EXTERNAL, &w, &h);
-    lua_pushnumber(L, w);
-    lua_pushnumber(L, h);
-    return 2;
-}
-
-static int script_get_screen_size(lua_State *L)
+static int script_get_osd_size(lua_State *L)
 {
     struct MPContext *mpctx = get_mpctx(L);
     struct mp_osd_res vo_res = osd_get_vo_res(mpctx->osd, OSDTYPE_EXTERNAL);
@@ -996,7 +986,7 @@ static int script_get_screen_size(lua_State *L)
     return 3;
 }
 
-static int script_get_screen_margins(lua_State *L)
+static int script_get_osd_margins(lua_State *L)
 {
     struct MPContext *mpctx = get_mpctx(L);
     struct mp_osd_res vo_res = osd_get_vo_res(mpctx->osd, OSDTYPE_EXTERNAL);
@@ -1012,10 +1002,8 @@ static int script_get_mouse_pos(lua_State *L)
     struct MPContext *mpctx = get_mpctx(L);
     int px, py;
     mp_input_get_mouse_pos(mpctx->input, &px, &py);
-    double sw, sh;
-    osd_object_get_scale_factor(mpctx->osd, OSDTYPE_EXTERNAL, &sw, &sh);
-    lua_pushnumber(L, px * sw);
-    lua_pushnumber(L, py * sh);
+    lua_pushnumber(L, px);
+    lua_pushnumber(L, py);
     return 2;
 }
 
@@ -1030,14 +1018,11 @@ static int script_input_set_section_mouse_area(lua_State *L)
 {
     struct MPContext *mpctx = get_mpctx(L);
 
-    double sw, sh;
-    osd_object_get_scale_factor(mpctx->osd, OSDTYPE_EXTERNAL, &sw, &sh);
-
     char *section = (char *)luaL_checkstring(L, 1);
-    int x0 = sw ? luaL_checkinteger(L, 2) / sw : 0;
-    int y0 = sh ? luaL_checkinteger(L, 3) / sh : 0;
-    int x1 = sw ? luaL_checkinteger(L, 4) / sw : 0;
-    int y1 = sh ? luaL_checkinteger(L, 5) / sh : 0;
+    int x0 = luaL_checkinteger(L, 2);
+    int y0 = luaL_checkinteger(L, 3);
+    int x1 = luaL_checkinteger(L, 4);
+    int y1 = luaL_checkinteger(L, 5);
     mp_input_set_section_mouse_area(mpctx->input, section, x0, y0, x1, y1);
     return 0;
 }
@@ -1266,9 +1251,8 @@ static const struct fn_entry main_fns[] = {
     FN_ENTRY(raw_observe_property),
     FN_ENTRY(raw_unobserve_property),
     FN_ENTRY(set_osd_ass),
-    FN_ENTRY(get_osd_resolution),
-    FN_ENTRY(get_screen_size),
-    FN_ENTRY(get_screen_margins),
+    FN_ENTRY(get_osd_size),
+    FN_ENTRY(get_osd_margins),
     FN_ENTRY(get_mouse_pos),
     FN_ENTRY(get_time),
     FN_ENTRY(input_set_section_mouse_area),
diff --git a/player/lua/osc.lua b/player/lua/osc.lua
index 24afeef970..f3beee85dd 100644
--- a/player/lua/osc.lua
+++ b/player/lua/osc.lua
@@ -99,6 +99,27 @@ local state = {
 -- Helperfunctions
 --
 
+-- scale factor for translating between real and virtual ASS coordinates
+function get_virt_scale_factor()
+    local w, h = mp.get_osd_size()
+    if w <= 0 or h <= 0 then
+        return 0, 0
+    end
+    return osc_param.playresx / w, osc_param.playresy / h
+end
+
+-- return mouse position in virtual ASS coordinates (playresx/y)
+function get_virt_mouse_pos()
+    local sx, sy = get_virt_scale_factor()
+    local x, y = mp.get_mouse_pos()
+    return x * sx, y * sy
+end
+
+function set_virt_mouse_area(x0, y0, x1, y1, name)
+    local sx, sy = get_virt_scale_factor()
+    mp.set_mouse_area(x0 * sx, y0 * sy, x1 * sx, y1 * sy)
+end
+
 function scale_value(x0, x1, y0, y1, val)
     local m = (y1 - y0) / (x1 - x0)
     local b = y0 - (m * x0)
@@ -141,7 +162,7 @@ function mouse_hit(element)
 end
 
 function mouse_hit_coords(bX1, bY1, bX2, bY2)
-    local mX, mY = mp.get_mouse_pos()
+    local mX, mY = get_virt_mouse_pos()
     return (mX >= bX1 and mX <= bX2 and mY >= bY1 and mY <= bY2)
 end
 
@@ -182,7 +203,7 @@ end
 
 -- get value at current mouse position
 function get_slider_value(element)
-    return get_slider_value_at(element, mp.get_mouse_pos())
+    return get_slider_value_at(element, get_virt_mouse_pos())
 end
 
 function countone(val)
@@ -589,7 +610,7 @@ function render_elements(master_ass)
                     end
 
                     elem_ass:new_event()
-                    elem_ass:pos(mp.get_mouse_pos(), ty)
+                    elem_ass:pos(get_virt_mouse_pos(), ty)
                     elem_ass:an(an)
                     elem_ass:append(slider_lo.tooltip_style)
                     elem_ass:append(tooltiplabel)
@@ -1298,7 +1319,7 @@ function osc_init()
 
     -- set canvas resolution according to display aspect and scaling setting
     local baseResY = 720
-    local display_w, display_h, display_aspect = mp.get_screen_size()
+    local display_w, display_h, display_aspect = mp.get_osd_size()
     local scale = 1
 
     if (mp.get_property("video") == "no") then -- dummy/forced window
@@ -1718,8 +1739,8 @@ end
 
 function render()
     msg.debug("rendering")
-    local current_screen_sizeX, current_screen_sizeY, aspect = mp.get_screen_size()
-    local mouseX, mouseY = mp.get_mouse_pos()
+    local current_screen_sizeX, current_screen_sizeY, aspect = mp.get_osd_size()
+    local mouseX, mouseY = get_virt_mouse_pos()
     local now = mp.get_time()
 
     -- check if display changed, if so request reinit
@@ -1782,7 +1803,7 @@ function render()
 
     --mouse show/hide area
     for k,cords in pairs(osc_param.areas["showhide"]) do
-        mp.set_mouse_area(cords.x1, cords.y1, cords.x2, cords.y2, "showhide")
+        set_virt_mouse_area(cords.x1, cords.y1, cords.x2, cords.y2, "showhide")
     end
     do_enable_keybindings()
 
@@ -1791,7 +1812,7 @@ function render()
 
     for _,cords in ipairs(osc_param.areas["input"]) do
         if state.osc_visible then -- activate only when OSC is actually visible
-            mp.set_mouse_area(cords.x1, cords.y1, cords.x2, cords.y2, "input")
+            set_virt_mouse_area(cords.x1, cords.y1, cords.x2, cords.y2, "input")
         end
         if state.osc_visible ~= state.input_enabled then
             if state.osc_visible then
@@ -1887,7 +1908,7 @@ function process_event(source, what)
         state.mouse_down_counter = 0
 
     elseif source == "mouse_move" then
-        local mouseX, mouseY = mp.get_mouse_pos()
+        local mouseX, mouseY = get_virt_mouse_pos()
         if (user_opts.minmousemove == 0) or
             (not ((state.last_mouseX == nil) or (state.last_mouseY == nil)) and
                 ((math.abs(mouseX - state.last_mouseX) >= user_opts.minmousemove)