sync code with last improvements from OpenBSD

driver/xf86-video-vmware/vmwgfx/vmwgfx_rr_inlines.h

@@ -0,0 +1,92 @@
+/**************************************************************************
+ * Copyright © 2016 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+/*
+ * This file contains calls into the RandR1.2 code and modification of core
+ * RandR data structures that probably were never intended from drivers.
+ */
+
+#ifndef _VMWGFX_RR_INLINES_H_
+#define _VMWGFX_RR_INLINES_H_
+
+#include <xf86Crtc.h>
+#include <xf86RandR12.h>
+
+#define VMW_DPI 96.
+#define VMW_INCH_TO_MM 25.4
+
+/**
+ * vmwgfx_notify_rr - Notify RandR that our configuration has changed.
+ *
+ * @pScreen: Pointer to the affected screen.
+ *
+ * Normally screen configurations are typically only changed using RandR,
+ * so when we do it in an udev handler, we need to notify RandR that we've
+ * made a change, so that it can be propagated to all RandR clients.
+ */
+static inline void
+vmwgfx_notify_rr(ScreenPtr pScreen)
+{
+    rrScrPriv(pScreen);
+
+
+    /*
+     * We need to update the time-stamps, otherwise X clients that haven't
+     * yet read this config might just overwrite it.
+     * This effectively stops the desktop manager from trying to
+     * outsmart us, since RandR simply doesn't accept requests from
+     * clients that haven't read this config and tag their request with
+     * an earlier timestamp.
+     */
+    pScrPriv->lastSetTime = currentTime;
+    pScrPriv->lastConfigTime = currentTime;
+#ifdef RANDR_12_INTERFACE
+    xf86RandR12TellChanged(pScreen);
+#else
+    RRTellChanged(pScreen);
+#endif
+}
+
+/**
+ * vmwgfx_rr_screen_set_size - Use RandR to change the root pixmap dimensions.
+ *
+ * @pScreen: Pointer to the affected screen.
+ *
+ * Returns: TRUE if successful. False otherwise.
+ */
+static inline Bool
+vmwgfx_rr_screen_set_size(ScreenPtr pScreen, int width, int height)
+{
+    rrScrPriv(pScreen);
+    float mm_width, mm_height;
+
+    mm_width = ((float) width) * VMW_INCH_TO_MM / VMW_DPI + .5;
+    mm_height = ((float) height) * VMW_INCH_TO_MM / VMW_DPI + .5;
+
+    return pScrPriv->rrScreenSetSize(pScreen, width, height,
+				     (int) mm_width, (int) mm_height);
+}
+
+#endif