# HG changeset patch
# User bsmith@81767d24-ef19-dc11-ae90-00e081727c95
# Date 1615580508 0
# Node ID 4367da529f5aef05d6bc4dbb468ea250a3c201a2
# Parent  7d54728064a36da12639c5fcf4b6c7638619fdaf
GTK4: Fix direct drawing onto render widgets. Can't cache the cairo_t.
If we never destroy the cairo_t drawing fails, so create it for each
drawing function.

diff -r 7d54728064a3 -r 4367da529f5a gtk4/dw.c
--- a/gtk4/dw.c	Fri Mar 12 15:19:40 2021 +0000
+++ b/gtk4/dw.c	Fri Mar 12 20:21:48 2021 +0000
@@ -843,17 +843,13 @@
    if(height == -1)
       height = gtk_widget_get_height(widget);
    
-   if(!wincr || GPOINTER_TO_INT(g_object_get_data(G_OBJECT(widget), "_dw_width")) != width ||
+   if(!surface || GPOINTER_TO_INT(g_object_get_data(G_OBJECT(widget), "_dw_width")) != width ||
       GPOINTER_TO_INT(g_object_get_data(G_OBJECT(widget), "_dw_height")) != height)
    {
-      if(wincr)
-         cairo_destroy(wincr);
       if(surface)
          cairo_surface_destroy(surface);
       surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
-      wincr = cairo_create(surface);
       /* Save the cairo context for use in the drawing functions */
-      g_object_set_data(G_OBJECT(widget), "_dw_cr", (gpointer)wincr);
       g_object_set_data(G_OBJECT(widget), "_dw_cr_surface", (gpointer)surface);
       g_object_set_data(G_OBJECT(widget), "_dw_width", GINT_TO_POINTER(width));
       g_object_set_data(G_OBJECT(widget), "_dw_height", GINT_TO_POINTER(height));
@@ -875,8 +871,14 @@
       exp.x = exp.y = 0;
       exp.width = width;
       exp.height = height;
+#ifdef DW_USE_CACHED_CR
+      g_object_set_data(G_OBJECT(widget), "_dw_cr", (gpointer)cr);
+#endif
       retval = exposefunc((HWND)widget, &exp, data);
-      /* Copy the cached image to the outbut surface */
+#ifdef DW_USE_CACHED_CR
+      g_object_set_data(G_OBJECT(widget), "_dw_cr", NULL);
+#endif
+      /* Copy the cached image to the output surface */
       cairo_set_source_surface(cr, g_object_get_data(G_OBJECT(widget), "_dw_cr_surface"), 0, 0);
       cairo_rectangle(cr, 0, 0, width, height);
       cairo_fill(cr);
@@ -6360,6 +6362,11 @@
 /* Make sure the widget is out of the dirty list if it is destroyed */
 static void _dw_render_destroy(GtkWidget *widget, gpointer data)
 {
+   cairo_surface_t *surface = (cairo_surface_t *)g_object_get_data(G_OBJECT(widget), "_dw_cr_surface");
+
+   if(surface)
+      cairo_surface_destroy(surface);
+
    _dw_dirty_list = g_list_remove(_dw_dirty_list, widget);
 }
 
@@ -6508,8 +6515,12 @@
 
    if(handle)
    {
+      cairo_surface_t *surface;
+
       if((cr = _dw_cairo_update(handle, -1, -1)))
          cached = TRUE;
+      else if((surface = g_object_get_data(G_OBJECT(handle), "_dw_cr_surface")))
+         cr = cairo_create(surface);
    }
    else if(pixmap)
       cr = cairo_create(pixmap->image);
@@ -6549,8 +6560,12 @@
 
    if(handle)
    {
+      cairo_surface_t *surface;
+
       if((cr = _dw_cairo_update(handle, -1, -1)))
          cached = TRUE;
+      else if((surface = g_object_get_data(G_OBJECT(handle), "_dw_cr_surface")))
+         cr = cairo_create(surface);
    }
    else if(pixmap)
       cr = cairo_create(pixmap->image);
@@ -6592,8 +6607,12 @@
 
    if(handle)
    {
+      cairo_surface_t *surface;
+
       if((cr = _dw_cairo_update(handle, -1, -1)))
          cached = TRUE;
+      else if((surface = g_object_get_data(G_OBJECT(handle), "_dw_cr_surface")))
+         cr = cairo_create(surface);
    }
    else if(pixmap)
       cr = cairo_create(pixmap->image);
@@ -6643,8 +6662,12 @@
 
    if(handle)
    {
+      cairo_surface_t *surface;
+
       if((cr = _dw_cairo_update(handle, -1, -1)))
          cached = TRUE;
+      else if((surface = g_object_get_data(G_OBJECT(handle), "_dw_cr_surface")))
+         cr = cairo_create(surface);
    }
    else if(pixmap)
       cr = cairo_create(pixmap->image);
@@ -6696,8 +6719,12 @@
 
    if(handle)
    {
+      cairo_surface_t *surface;
+
       if((cr = _dw_cairo_update(handle, -1, -1)))
          cached = TRUE;
+      else if((surface = g_object_get_data(G_OBJECT(handle), "_dw_cr_surface")))
+         cr = cairo_create(surface);
    }
    else if(pixmap)
       cr = cairo_create(pixmap->image);
@@ -6760,8 +6787,12 @@
 
       if(handle)
       {
+         cairo_surface_t *surface;
+
          if((cr = _dw_cairo_update(handle, -1, -1)))
             cached = TRUE;
+         else if((surface = g_object_get_data(G_OBJECT(handle), "_dw_cr_surface")))
+            cr = cairo_create(surface);
          if((tmpname = (char *)g_object_get_data(G_OBJECT(handle), "_dw_fontname")))
             fontname = tmpname;
       }
@@ -7186,8 +7217,12 @@
 
    if(dest)
    {
+      cairo_surface_t *surface;
+
       if((cr = _dw_cairo_update(dest, -1, -1)))
          cached = TRUE;
+      else if((surface = g_object_get_data(G_OBJECT(dest), "_dw_cr_surface")))
+         cr = cairo_create(surface);
    }
    else if(destp)
       cr = cairo_create(destp->image);
@@ -7207,10 +7242,10 @@
       {
          cairo_surface_t *surface = g_object_get_data(G_OBJECT(src), "_dw_cr_surface");
          if(surface)
-            cairo_set_source_surface (cr, surface, (xdest + xsrc) / xscale, (ydest + ysrc) / yscale);
+            cairo_set_source_surface(cr, surface, (xdest + xsrc) / xscale, (ydest + ysrc) / yscale);
       }        
       else if(srcp)
-         cairo_set_source_surface (cr, srcp->image, (xdest + xsrc) / xscale, (ydest + ysrc) / yscale);
+         cairo_set_source_surface(cr, srcp->image, (xdest + xsrc) / xscale, (ydest + ysrc) / yscale);
 
       cairo_rectangle(cr, xdest / xscale, ydest / yscale, width, height);
       cairo_fill(cr);