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-rw-r--r--widget/gtk/nsScreenGtk.cpp207
1 files changed, 207 insertions, 0 deletions
diff --git a/widget/gtk/nsScreenGtk.cpp b/widget/gtk/nsScreenGtk.cpp
new file mode 100644
index 000000000..61e6605b7
--- /dev/null
+++ b/widget/gtk/nsScreenGtk.cpp
@@ -0,0 +1,207 @@
+/* -*- Mode: C++; tab-width: 2; 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/. */
+
+#include "nsScreenGtk.h"
+
+#include "nsIWidget.h"
+
+#include <gdk/gdk.h>
+#ifdef MOZ_X11
+#include <gdk/gdkx.h>
+#include <X11/Xatom.h>
+#endif
+#include <gtk/gtk.h>
+#include <dlfcn.h>
+#include "gfxPlatformGtk.h"
+
+static uint32_t sScreenId = 0;
+
+
+nsScreenGtk :: nsScreenGtk ( )
+ : mScreenNum(0),
+ mRect(0, 0, 0, 0),
+ mAvailRect(0, 0, 0, 0),
+ mId(++sScreenId)
+{
+}
+
+
+nsScreenGtk :: ~nsScreenGtk()
+{
+}
+
+
+NS_IMETHODIMP
+nsScreenGtk :: GetId(uint32_t *aId)
+{
+ *aId = mId;
+ return NS_OK;
+} // GetId
+
+
+NS_IMETHODIMP
+nsScreenGtk :: GetRect(int32_t *outLeft, int32_t *outTop, int32_t *outWidth, int32_t *outHeight)
+{
+ *outLeft = mRect.x;
+ *outTop = mRect.y;
+ *outWidth = mRect.width;
+ *outHeight = mRect.height;
+
+ return NS_OK;
+
+} // GetRect
+
+
+NS_IMETHODIMP
+nsScreenGtk :: GetAvailRect(int32_t *outLeft, int32_t *outTop, int32_t *outWidth, int32_t *outHeight)
+{
+ *outLeft = mAvailRect.x;
+ *outTop = mAvailRect.y;
+ *outWidth = mAvailRect.width;
+ *outHeight = mAvailRect.height;
+
+ return NS_OK;
+
+} // GetAvailRect
+
+gint
+nsScreenGtk :: GetGtkMonitorScaleFactor()
+{
+#if (MOZ_WIDGET_GTK >= 3)
+ // Since GDK 3.10
+ static auto sGdkScreenGetMonitorScaleFactorPtr = (gint (*)(GdkScreen*, gint))
+ dlsym(RTLD_DEFAULT, "gdk_screen_get_monitor_scale_factor");
+ if (sGdkScreenGetMonitorScaleFactorPtr) {
+ // FIXME: In the future, we'll want to fix this for GTK on Wayland which
+ // supports a variable scale factor per display.
+ GdkScreen *screen = gdk_screen_get_default();
+ return sGdkScreenGetMonitorScaleFactorPtr(screen, 0);
+ }
+#endif
+ return 1;
+}
+
+double
+nsScreenGtk :: GetDPIScale()
+{
+ double dpiScale = nsIWidget::DefaultScaleOverride();
+ if (dpiScale <= 0.0) {
+ dpiScale = GetGtkMonitorScaleFactor() * gfxPlatformGtk::GetDPIScale();
+ }
+ return dpiScale;
+}
+
+NS_IMETHODIMP
+nsScreenGtk :: GetPixelDepth(int32_t *aPixelDepth)
+{
+ GdkVisual * visual = gdk_screen_get_system_visual(gdk_screen_get_default());
+ *aPixelDepth = gdk_visual_get_depth(visual);
+
+ return NS_OK;
+
+} // GetPixelDepth
+
+NS_IMETHODIMP
+nsScreenGtk :: GetColorDepth(int32_t *aColorDepth)
+{
+ return GetPixelDepth ( aColorDepth );
+
+} // GetColorDepth
+
+NS_IMETHODIMP
+nsScreenGtk::GetDefaultCSSScaleFactor(double* aScaleFactor)
+{
+ *aScaleFactor = GetDPIScale();
+ return NS_OK;
+}
+
+void
+nsScreenGtk :: Init (GdkWindow *aRootWindow)
+{
+ gint scale = nsScreenGtk::GetGtkMonitorScaleFactor();
+ gint width = gdk_screen_width()*scale;
+ gint height = gdk_screen_height()*scale;
+
+ // We listen for configure events on the root window to pick up
+ // changes to this rect. We could listen for "size_changed" signals
+ // on the default screen to do this, except that doesn't work with
+ // versions of GDK predating the GdkScreen object. See bug 256646.
+ mAvailRect = mRect = nsIntRect(0, 0, width, height);
+
+#ifdef MOZ_X11
+ // We need to account for the taskbar, etc in the available rect.
+ // See http://freedesktop.org/Standards/wm-spec/index.html#id2767771
+
+ // XXX do we care about _NET_WM_STRUT_PARTIAL? That will
+ // add much more complexity to the code here (our screen
+ // could have a non-rectangular shape), but should
+ // lead to greater accuracy.
+
+ long *workareas;
+ GdkAtom type_returned;
+ int format_returned;
+ int length_returned;
+
+ GdkAtom cardinal_atom = gdk_x11_xatom_to_atom(XA_CARDINAL);
+
+ gdk_error_trap_push();
+
+ // gdk_property_get uses (length + 3) / 4, hence G_MAXLONG - 3 here.
+ if (!gdk_property_get(aRootWindow,
+ gdk_atom_intern ("_NET_WORKAREA", FALSE),
+ cardinal_atom,
+ 0, G_MAXLONG - 3, FALSE,
+ &type_returned,
+ &format_returned,
+ &length_returned,
+ (guchar **) &workareas)) {
+ // This window manager doesn't support the freedesktop standard.
+ // Nothing we can do about it, so assume full screen size.
+ return;
+ }
+
+ // Flush the X queue to catch errors now.
+ gdk_flush();
+
+ if (!gdk_error_trap_pop() &&
+ type_returned == cardinal_atom &&
+ length_returned && (length_returned % 4) == 0 &&
+ format_returned == 32) {
+ int num_items = length_returned / sizeof(long);
+
+ for (int i = 0; i < num_items; i += 4) {
+ nsIntRect workarea(workareas[i], workareas[i + 1],
+ workareas[i + 2], workareas[i + 3]);
+ if (!mRect.Contains(workarea)) {
+ // Note that we hit this when processing screen size changes,
+ // since we'll get the configure event before the toolbars have
+ // been moved. We'll end up cleaning this up when we get the
+ // change notification to the _NET_WORKAREA property. However,
+ // we still want to listen to both, so we'll handle changes
+ // properly for desktop environments that don't set the
+ // _NET_WORKAREA property.
+ NS_WARNING("Invalid bounds");
+ continue;
+ }
+
+ mAvailRect.IntersectRect(mAvailRect, workarea);
+ }
+ }
+ g_free (workareas);
+#endif
+}
+
+#ifdef MOZ_X11
+void
+nsScreenGtk :: Init (XineramaScreenInfo *aScreenInfo)
+{
+ nsIntRect xineRect(aScreenInfo->x_org, aScreenInfo->y_org,
+ aScreenInfo->width, aScreenInfo->height);
+
+ mScreenNum = aScreenInfo->screen_number;
+
+ mAvailRect = mRect = xineRect;
+}
+#endif