Split out glx surface creation to its own file

1 files changed, 81 insertions, 0 deletions

diff --git a/src/surface-glx.cpp b/src/surface-glx.cpp
new file mode 100644
index 0000000..8285f5c
--- /dev/null
+++ b/src/surface-glx.cpp
@@ -0,0 +1,81 @@
+#include <stdlib.h>
+#include <cairo.h>
+#include <cairo-gl.h>
+
+struct closure {
+  Display *dpy;
+  GLXContext ctx;
+};
+
+static void
+cleanup (void *data)
+{
+  struct closure *arg = (closure*)data;
+
+  glXDestroyContext (arg->dpy, arg->ctx);
+  XCloseDisplay (arg->dpy);
+
+  free (arg);
+}
+
+cairo_surface_t *
+create_source_surface_glx (int width, int height)
+{
+  int rgba_attribs[] = {
+    GLX_RGBA,
+    GLX_RED_SIZE, 1,
+    GLX_GREEN_SIZE, 1,
+    GLX_BLUE_SIZE, 1,
+    GLX_ALPHA_SIZE, 1,
+    GLX_DOUBLEBUFFER,
+    None
+  };
+  XVisualInfo *visinfo;
+  GLXContext ctx;
+  struct closure *arg;
+  cairo_device_t *device;
+  cairo_surface_t *surface;
+  Display *dpy;
+
+  dpy = XOpenDisplay (NULL);
+  if (dpy == NULL)
+    return NULL;
+
+  visinfo = glXChooseVisual (dpy, DefaultScreen (dpy), rgba_attribs);
+  if (visinfo == NULL) {
+    XCloseDisplay (dpy);
+    return NULL;
+  }
+
+  ctx = glXCreateContext (dpy, visinfo, NULL, True);
+  XFree (visinfo);
+
+  if (ctx == NULL) {
+    XCloseDisplay (dpy);
+    return NULL;
+  }
+
+  arg = (closure*) malloc (sizeof (struct closure));
+  if (!arg) {
+    XCloseDisplay (dpy);
+    return NULL;
+  }
+  arg->dpy = dpy;
+  arg->ctx = ctx;
+  device = cairo_glx_device_create (dpy, ctx);
+  if (cairo_device_set_user_data (device,
+				  (cairo_user_data_key_t *) cleanup,
+				  arg,
+				  cleanup))
+    {
+      cleanup (arg);
+      return NULL;
+    }
+
+  surface = cairo_gl_surface_create (device,
+				     CAIRO_CONTENT_COLOR_ALPHA,
+				     width, height);
+  cairo_device_destroy (device);
+
+  return surface;
+}