From 655c993c5b681fbd28db27a3bf96aec6044ab89f Mon Sep 17 00:00:00 2001
From: Geoffrey McRae <geoff@hostfission.com>
Date: Mon, 9 May 2022 14:05:04 +1000
Subject: [PATCH] [client] main: add new option for integer only upscaling

The new option `win:intUpscale` will limit upscaling to integer sizes
only if enabled.
---
 client/src/config.c |  8 ++++++++
 client/src/core.c   | 14 ++++++++++++++
 client/src/main.h   |  1 +
 3 files changed, 23 insertions(+)

diff --git a/client/src/config.c b/client/src/config.c
index cd5871dd..296a2504 100644
--- a/client/src/config.c
+++ b/client/src/config.c
@@ -163,6 +163,13 @@ static struct Option options[] =
     .type           = OPTION_TYPE_BOOL,
     .value.x_bool   = false,
   },
+  {
+    .module         = "win",
+    .name           = "intUpscale",
+    .description    = "Allow only integer upscaling",
+    .type           = OPTION_TYPE_BOOL,
+    .value.x_bool   = false,
+  },
   {
     .module         = "win",
     .name           = "shrinkOnUpscale",
@@ -603,6 +610,7 @@ bool config_load(int argc, char * argv[])
   g_params.keepAspect      = option_get_bool  ("win", "keepAspect"     );
   g_params.forceAspect     = option_get_bool  ("win", "forceAspect"    );
   g_params.dontUpscale     = option_get_bool  ("win", "dontUpscale"    );
+  g_params.intUpscale      = option_get_bool  ("win", "intUpscale"     );
   g_params.shrinkOnUpscale = option_get_bool  ("win", "shrinkOnUpscale");
   g_params.borderless      = option_get_bool  ("win", "borderless"     );
   g_params.fullscreen      = option_get_bool  ("win", "fullScreen"     );
diff --git a/client/src/core.c b/client/src/core.c
index eaf3fd7a..8a6ccdd7 100644
--- a/client/src/core.c
+++ b/client/src/core.c
@@ -223,6 +223,20 @@ void core_updatePositionInfo(void)
       g_state.dstRect.y = g_state.windowCY - srcH / 2;
     }
     else
+    if (g_params.intUpscale &&
+        srcW <= g_state.windowW &&
+        srcH <= g_state.windowH)
+    {
+      force = false;
+      const int scale = min(
+          floor(g_state.windowW / srcW),
+          floor(g_state.windowH / srcH));
+      g_state.dstRect.w = srcW * scale;
+      g_state.dstRect.h = srcH * scale;
+      g_state.dstRect.x = g_state.windowCX - g_state.dstRect.w / 2;
+      g_state.dstRect.y = g_state.windowCY - g_state.dstRect.h / 2;
+    }
+    else
     if ((int)(wndAspect * 1000) == (int)(srcAspect * 1000))
     {
       force           = false;
diff --git a/client/src/main.h b/client/src/main.h
index b2ba967a..ae05fc63 100644
--- a/client/src/main.h
+++ b/client/src/main.h
@@ -148,6 +148,7 @@ struct AppParams
   bool              keepAspect;
   bool              forceAspect;
   bool              dontUpscale;
+  bool              intUpscale;
   bool              shrinkOnUpscale;
   bool              borderless;
   bool              fullscreen;