From c409b8bebaeb72f8c95514ed3c01fd173fb0d98b Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor.andersson@artifex.com>
Date: Tue, 13 Nov 2018 18:45:02 +0100
Subject: gl: Calculate accurate initial window size when scaling to fit
 screen.

---
 platform/gl/gl-main.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/platform/gl/gl-main.c b/platform/gl/gl-main.c
index 1910f1b3..7a2ac0a4 100644
--- a/platform/gl/gl-main.c
+++ b/platform/gl/gl-main.c
@@ -1587,9 +1587,17 @@ int main(int argc, char **argv)
 				sx = sy;
 			if (sx < 1)
 			{
+				fz_irect area;
+
 				currentzoom *= sx;
-				page_tex.w *= sx;
-				page_tex.h *= sx;
+
+				/* compute bounds here for initial window size */
+				page_bounds = fz_bound_page(ctx, fzpage);
+				transform_page();
+
+				area = fz_irect_from_rect(draw_page_bounds);
+				page_tex.w = area.x1 - area.x0;
+				page_tex.h = area.y1 - area.y0;
 			}
 
 			ui_init(page_tex.w, page_tex.h, "MuPDF: Loading...");
-- 
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