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-rw-r--r--widget/nsShmImage.h75
1 files changed, 75 insertions, 0 deletions
diff --git a/widget/nsShmImage.h b/widget/nsShmImage.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef __mozilla_widget_nsShmImage_h__
+#define __mozilla_widget_nsShmImage_h__
+
+#if defined(MOZ_X11)
+# define MOZ_HAVE_SHMIMAGE
+#endif
+
+#ifdef MOZ_HAVE_SHMIMAGE
+
+#include "mozilla/gfx/2D.h"
+#include "nsIWidget.h"
+#include "Units.h"
+
+#include <X11/Xlib-xcb.h>
+#include <xcb/shm.h>
+
+class nsShmImage {
+ // bug 1168843, compositor thread may create shared memory instances that are destroyed by main thread on shutdown, so this must use thread-safe RC to avoid hitting assertion
+ NS_INLINE_DECL_THREADSAFE_REFCOUNTING(nsShmImage)
+
+public:
+ static bool UseShm();
+
+ already_AddRefed<mozilla::gfx::DrawTarget>
+ CreateDrawTarget(const mozilla::LayoutDeviceIntRegion& aRegion);
+
+ void Put(const mozilla::LayoutDeviceIntRegion& aRegion);
+
+ nsShmImage(Display* aDisplay,
+ Drawable aWindow,
+ Visual* aVisual,
+ unsigned int aDepth);
+
+private:
+ ~nsShmImage();
+
+ bool InitExtension();
+
+ bool CreateShmSegment();
+ void DestroyShmSegment();
+
+ bool CreateImage(const mozilla::gfx::IntSize& aSize);
+ void DestroyImage();
+
+ void WaitIfPendingReply();
+
+ Display* mDisplay;
+ xcb_connection_t* mConnection;
+ Window mWindow;
+ Visual* mVisual;
+ unsigned int mDepth;
+
+ mozilla::gfx::SurfaceFormat mFormat;
+ mozilla::gfx::IntSize mSize;
+ int mStride;
+
+ xcb_pixmap_t mPixmap;
+ xcb_gcontext_t mGC;
+ xcb_get_input_focus_cookie_t mSyncRequest;
+ bool mRequestPending;
+
+ xcb_shm_seg_t mShmSeg;
+ int mShmId;
+ uint8_t* mShmAddr;
+};
+
+#endif // MOZ_HAVE_SHMIMAGE
+
+#endif