From 67bb631bd9d3b32e83fabe254a7a413034a13a96 Mon Sep 17 00:00:00 2001
From: ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
Date: Mon, 30 Nov 2020 18:50:11 +0100
Subject: Scaling for Windows and X11: support rectangular loops.

---
 src/Fl_Graphics_Driver.cxx | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

(limited to 'src/Fl_Graphics_Driver.cxx')

diff --git a/src/Fl_Graphics_Driver.cxx b/src/Fl_Graphics_Driver.cxx
index d0b9bf370..e156ae2c4 100644
--- a/src/Fl_Graphics_Driver.cxx
+++ b/src/Fl_Graphics_Driver.cxx
@@ -713,7 +713,23 @@ void Fl_Scalable_Graphics_Driver::loop(int x0, int y0, int x1, int y1, int x2, i
 }
 
 void Fl_Scalable_Graphics_Driver::loop(int x0, int y0, int x1, int y1, int x2, int y2, int x3, int y3) {
-    loop_unscaled(x0*scale(), y0*scale(), x1*scale(), y1*scale(), x2*scale(), y2*scale(), x3*scale(), y3*scale());
+  int X, Y, W, H;
+  if (x0 == x3 && x1 == x2 && y0 == y1 && y3 == y2) { // rectangular loop
+    X = x0 > x1 ? x1 : x0;
+    Y = y0 > y3 ? y3 : y0;
+    W = abs(x0 - x1);
+    H = abs(y0 - y3);
+    rect(X, Y, W + 1, H + 1);
+  } else if (x0 == x1 && y1 == y2 && x2 == x3 && y3 == y0) { // rectangular loop also
+    X = x0 > x3 ? x3 : x0;
+    Y = y0 > y1 ? y1 : y0;
+    W = abs(x0 - x3);
+    H = abs(y0 - y1);
+    rect(X, Y, W + 1, H + 1);
+  } else {
+    float s = scale();
+    loop_unscaled(x0*s, y0*s, x1*s, y1*s, x2*s, y2*s, x3*s, y3*s);
+  }
 }
 
 void Fl_Scalable_Graphics_Driver::polygon(int x0, int y0, int x1, int y1, int x2, int y2) {
-- 
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