tr2/viewport: fix screenshots at wrong resolution

Resolves #2845.

docs/tr2/CHANGELOG.md

@@ -1,6 +1,7 @@
 ## [Unreleased](https://github.com/LostArtefacts/TRX/compare/tr2-1.0.1...develop) - ××××-××-××
 - fixed guns carried by enemies not being converted to ammo if Lara has picked up the same gun elsewhere in the same level (#2856)
 - fixed guns carried by enemies not being converted to ammo if Lara starts the level with the gun and the game has later been reloaded (#2850, regression from 1.0)
+- fixed 1920x1080 screenshots in 16:9 aspect mode being saved as 1919x1080 (#2845, regression from 0.8)
 
 ## [1.0.1](https://github.com/LostArtefacts/TRX/compare/tr2-1.0...tr2-1.0.1) - 2025-04-24
 - added an option to wraparound when scrolling UI dialogs, such as save/load (#2834)

src/tr2/game/viewport.c

@@ -125,20 +125,23 @@ void Viewport_Reset(void)
     VIEWPORT *const vp = &m_Viewport;
     switch (g_Config.rendering.aspect_mode) {
     case AM_4_3:
-        vp->render_ar = 4.0 / 3.0;
+        vp->render_ar.w = 4;
+        vp->render_ar.h = 3;
         break;
     case AM_16_9:
-        vp->render_ar = 16.0 / 9.0;
+        vp->render_ar.w = 16;
+        vp->render_ar.h = 9;
         break;
     case AM_ANY:
-        vp->render_ar = size.w / (double)size.h;
+        vp->render_ar.w = size.w;
+        vp->render_ar.h = size.h;
         break;
     }
 
     vp->width = size.w / g_Config.rendering.scaler;
     vp->height = size.h / g_Config.rendering.scaler;
     if (g_Config.rendering.aspect_mode != AM_ANY) {
-        vp->width = vp->height * vp->render_ar;
+        vp->width = vp->height * vp->render_ar.w / vp->render_ar.h;
     }
 
     vp->near_z = Output_GetNearZ() >> W2V_SHIFT;

src/tr2/game/viewport.h

@@ -8,7 +8,10 @@ typedef struct {
     int32_t near_z;
     int32_t far_z;
     int16_t view_angle;
-    double render_ar;
+    struct {
+        int32_t w;
+        int32_t h;
+    } render_ar;
 
     // TODO: remove most of these variables if possible
     struct {