Added build options for X11

Build option to use software rendering if running under X11, and another
option to set the position of a window only after the window has been
shown. The latter is a workaround for an SDL bug regarding window
borders affecting the initial position.

3 files changed, 21 insertions, 1 deletions

diff --git a/src/app.c b/src/app.c
index 285036cb..84e57ce2 100644
--- a/src/app.c
+++ b/src/app.c
@@ -547,7 +547,15 @@ iBool forceLineWrap_App(void) {
 }
 
 iBool forceSoftwareRender_App(void) {
-    return app_.forceSoftwareRender;
+    if (app_.forceSoftwareRender) {
+        return iTrue;
+    }
+#if defined (LAGRANGE_ENABLE_X11_SWRENDER)
+    if (getenv("DISPLAY")) {
+        return iTrue;
+    }
+#endif
+    return iFalse;
 }
 
 enum iColorTheme colorTheme_App(void) {
diff --git a/src/ui/window.c b/src/ui/window.c
index b43e8421..8ebb67a8 100644
--- a/src/ui/window.c
+++ b/src/ui/window.c
@@ -506,6 +506,7 @@ iBool create_Window_(iWindow *d, iRect rect, uint32_t flags) {
 void init_Window(iWindow *d, iRect rect) {
     theWindow_ = d;
     iZap(d->cursors);
+    d->initialPos = rect.pos;
     d->pendingCursor = NULL;
     d->isDrawFrozen = iTrue;
     uint32_t flags = 0;
@@ -597,6 +598,16 @@ SDL_Renderer *renderer_Window(const iWindow *d) {
 
 static iBool handleWindowEvent_Window_(iWindow *d, const SDL_WindowEvent *ev) {
     switch (ev->event) {
+#if defined (LAGRANGE_ENABLE_WINDOWPOS_FIX)
+        case SDL_WINDOWEVENT_EXPOSED:
+            if (d->initialPos.x >= 0) {
+                int bx, by;
+                SDL_GetWindowBordersSize(d->win, &by, &bx, NULL, NULL);
+                SDL_SetWindowPosition(d->win, d->initialPos.x + bx, d->initialPos.y + by);
+                d->initialPos = init1_I2(-1);
+            }
+            return iFalse;
+#endif
         case SDL_WINDOWEVENT_MOVED:
             /* No need to do anything. */
             return iTrue;
diff --git a/src/ui/window.h b/src/ui/window.h
index 4aec2fa7..b067d30e 100644
--- a/src/ui/window.h
+++ b/src/ui/window.h
@@ -34,6 +34,7 @@ iDeclareTypeConstructionArgs(Window, iRect rect)
 
 struct Impl_Window {
     SDL_Window *  win;
+    iInt2         initialPos;
     iBool         isDrawFrozen; /* avoids premature draws while restoring window state */
     SDL_Renderer *render;
     iWidget *     root;