Add XCB supportHEADmaster

This adds an XCB backend and hooks it up for cairo (not skia... yet).
This is for doing performance comparisons of the GL backend against
"standard Cairo".

1 files changed, 82 insertions, 0 deletions

diff --git a/src/cairo-xcb.cpp b/src/cairo-xcb.cpp
new file mode 100644
index 0000000..7a67a54
--- /dev/null
+++ b/src/cairo-xcb.cpp
@@ -0,0 +1,82 @@
+/*
+ * Copyright 2017 © Samsung Research America, Silicon Valley
+ *
+ * Use of this source code is governed by the 3-Clause BSD license
+ * specified in the COPYING file included with this source code.
+ */
+#include <config.h>
+
+#include <err.h>
+#include <stdlib.h>
+#include <assert.h>
+
+#include <cairo.h>
+#include <cairo-xcb.h>
+
+#include "xcb.h"
+#include "device_config.h"
+
+static xcb_state_t *state;
+static cairo_surface_t *cairo_surface;
+
+cairo_surface_t *
+create_cairo_surface_xcb (const device_config_t& config)
+{
+    // TODO: This needs initted to 0
+    state = (xcb_state_t*) malloc (sizeof (xcb_state_t));
+    if (!state) {
+        warnx ("Out of memory\n");
+        return NULL;
+    }
+
+    if (!createXCBContextAndWindow(state, config.width, config.height)) {
+        cleanup_state_xcb(state);
+        errx (-1, "Could not create XCB context and window\n");
+    }
+
+    assert(state->xcb_window >= 0);
+    assert(state->xcb_connection);
+    assert(state->xcb_visual_type);
+
+    // TODO: Do XCB-specific setup and surface creation
+    cairo_surface = cairo_xcb_surface_create(
+        state->xcb_connection,     // XCB connection
+        state->xcb_window,      // XCB drawable window
+        state->xcb_visual_type, // Visual to use for drawing to window
+        config.width,           // Window width
+        config.height);         // Window height
+
+    // TODO: Set background, clear colors, etc.
+
+    return cairo_surface;
+}
+
+void
+destroy_cairo_xcb(void)
+{
+    cleanup_state_xcb((void*)state);
+
+    cairo_surface_finish(cairo_surface);
+
+    // TODO: Do I need to destroy the surface here, or higher up?  If here, then do I need to track
+    // cairo_surface in state?  Uncommented, this causes a ref count fault, so it appears to
+    // already have been destroyed (maybe by _finish?)
+    //cairo_surface_destroy(cairo_surface);
+}
+
+void
+update_cairo_xcb(void)
+{
+    // TODO
+}
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :