Issue #65. Create window for image backend and display the output from image surface.

1 files changed, 53 insertions, 0 deletions

diff --git a/src/image.cpp b/src/image.cpp
index b17b612..4462ecc 100644
--- a/src/image.cpp
+++ b/src/image.cpp
@@ -9,6 +9,7 @@
 #include <err.h>
 #include <stdlib.h>
 
+#include "device_config.h"
 #include "image.h"
 
 void
@@ -18,6 +19,58 @@ cleanup_state_image (void *data)
     free(state);
 }
 
+bool
+createImageWindow(image_state_t *state, const device_config_t& device_config)
+{
+    state->dpy = XOpenDisplay (NULL);
+    if (!state->dpy) {
+        warnx ("fail to open display: %s\n", XDisplayName (0));
+        return false;
+    }
+
+    int screen = DefaultScreen (state->dpy);
+
+    XVisualInfo vi;
+    XSetWindowAttributes attrs;
+
+    XMatchVisualInfo (state->dpy, screen, 32, TrueColor, &vi);
+    attrs.border_pixel = 0;
+    attrs.event_mask = StructureNotifyMask;
+    attrs.colormap = XCreateColormap (state->dpy, DefaultRootWindow (state->dpy),
+                                      vi.visual, AllocNone);
+    state->window = XCreateWindow (state->dpy, DefaultRootWindow (state->dpy),
+                                   0, 0,
+                                   device_config.width, device_config.height,
+                                   0,
+                                   vi.depth,
+                                   InputOutput, vi.visual,
+                                   CWBorderPixel | CWColormap | CWEventMask,
+                                   &attrs);
+    state->width = device_config.width;
+    state->height = device_config.height;
+    XMapWindow (state->dpy, state->window);
+
+    state->gc = XCreateGC (state->dpy, state->window, 0, NULL);
+    return true;
+}
+
+void
+updateImageWindow(image_state_t* state)
+{
+    XPutImage (state->dpy, state->window, state->gc, &state->image,
+               0, 0,
+               0, 0,
+               state->width, state->height);
+    XSync (state->dpy, False);
+}
+void
+destroyImageWindow(image_state_t* state)
+{
+    XFreeGC (state->dpy, state->gc);
+    XDestroyWindow (state->dpy, state->window);
+    XCloseDisplay (state->dpy);
+}
+
 /*
   Local Variables:
   mode:c++