SDL_image: showimage: Add a -quit option

SDL Commits
1 
From dec2e6e30c53341a0d0db615e5ed8c26217977b9 Mon Sep 17 00:00:00 2001
From: Simon McVittie <[EMAIL REDACTED]>
Date: Mon, 23 Sep 2019 15:37:05 +0100
Subject: [PATCH] showimage: Add a -quit option

This allows showimage to be used as a non-interactive smoke-test to
check that the SDL2_image library can be linked against successfully,
for example as used in the Steam Runtime:

    xvfb-run ./showimage -quit -save debian-logo.bmp /usr/share/pixmaps/debian-logo.png

Signed-off-by: Simon McVittie <smcv@collabora.com>
---
 showimage.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/showimage.c b/showimage.c
index 6b668ea..109a3d2 100644
--- a/showimage.c
+++ b/showimage.c
@@ -54,7 +54,8 @@ int main(int argc, char *argv[])
     SDL_Renderer *renderer;
     SDL_Texture *texture;
     Uint32 flags;
-    int i, w, h, done;
+    int i, w, h;
+    int done = 0;
     SDL_Event event;
     const char *saveFile = NULL;
 
@@ -87,6 +88,11 @@ int main(int argc, char *argv[])
             continue;
         }
 
+        if ( SDL_strcmp(argv[i], "-quit") == 0 ) {
+            done = 1;
+            continue;
+        }
+
         if ( SDL_strcmp(argv[i], "-save") == 0 && argv[i+1] ) {
             ++i;
             saveFile = argv[i];
@@ -127,7 +133,6 @@ int main(int argc, char *argv[])
         SDL_SetWindowSize(window, w, h);
         SDL_ShowWindow(window);
 
-        done = 0;
         while ( ! done ) {
             while ( SDL_PollEvent(&event) ) {
                 switch (event.type) {