gtk/gdk/win32/gdkscreen-win32.c

/* GDK - The GIMP Drawing Kit
 * Copyright (C) 2002 Hans Breuer
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library. If not, see <http://www.gnu.org/licenses/>.
 */

#include "config.h"
#include "gdk.h"
#include "gdkprivate-win32.h"
#include "gdkscreenprivate.h"
#include "gdkwin32screen.h"
#include "gdkdisplayprivate.h"
#include "gdkvisualprivate.h"

#include <dwmapi.h>

typedef struct
{
  gchar *name;
  gint width_mm, height_mm;
  GdkRectangle rect;
} GdkWin32Monitor;

struct _GdkWin32Screen
{
  GdkScreen parent_instance;

  gint num_monitors;
  GdkWin32Monitor *monitors;

  GdkWindow *root_window;

  gint always_composited : 1;
};

struct _GdkWin32ScreenClass
{
  GdkScreenClass parent_class;
};

G_DEFINE_TYPE (GdkWin32Screen, gdk_win32_screen, GDK_TYPE_SCREEN)

static void
gdk_win32_screen_init (GdkWin32Screen *win32_screen)
{
  GdkScreen *screen = GDK_SCREEN (win32_screen);
  HDC screen_dc;
  int logpixelsx = -1;
  const gchar *font_resolution;

  screen_dc = GetDC (NULL);

  if (screen_dc)
    {
      logpixelsx = GetDeviceCaps(screen_dc, LOGPIXELSX);
      ReleaseDC (NULL, screen_dc);
    }

  font_resolution = g_getenv ("GDK_WIN32_FONT_RESOLUTION");
  if (font_resolution)
    {
      int env_logpixelsx = atol (font_resolution);
      if (env_logpixelsx > 0)
        logpixelsx = env_logpixelsx;
    }

  if (logpixelsx > 0)
    _gdk_screen_set_resolution (screen, logpixelsx);

  /* On Windows 8 and later, DWM (composition) is always enabled */
  win32_screen->always_composited = g_win32_check_windows_version (6, 2, 0, G_WIN32_OS_ANY);
}

void
_gdk_screen_init_root_window_size (GdkWin32Screen *screen)
{
  GdkRectangle rect;
  int i;

  rect = screen->monitors[0].rect;
  for (i = 1; i < screen->num_monitors; i++)
    gdk_rectangle_union (&rect, &screen->monitors[i].rect, &rect);

  screen->root_window->width = rect.width;
  screen->root_window->height = rect.height;
}

void
_gdk_screen_init_root_window (GdkWin32Screen *screen_win32)
{
  GdkScreen *screen;
  GdkWindow *window;
  GdkWindowImplWin32 *impl_win32;

  screen = GDK_SCREEN (screen_win32);

  g_assert (screen_win32->root_window == NULL);

  window = _gdk_display_create_window (_gdk_display);
  window->impl = g_object_new (GDK_TYPE_WINDOW_IMPL_WIN32, NULL);
  impl_win32 = GDK_WINDOW_IMPL_WIN32 (window->impl);
  impl_win32->wrapper = window;

  window->impl_window = window;
  window->visual = gdk_screen_get_system_visual (screen);

  window->window_type = GDK_WINDOW_ROOT;
  window->depth = window->visual->depth;

  screen_win32->root_window = window;

  _gdk_screen_init_root_window_size (screen_win32);

  window->x = 0;
  window->y = 0;
  window->abs_x = 0;
  window->abs_y = 0;
  /* width and height already initialised in _gdk_screen_init_root_window_size() */
  window->viewable = TRUE;

  gdk_win32_handle_table_insert ((HANDLE *) &impl_win32->handle, window);

  GDK_NOTE (MISC, g_print ("screen->root_window=%p\n", window));
}

static BOOL CALLBACK
count_monitor (HMONITOR hmonitor,
               HDC      hdc,
               LPRECT   rect,
               LPARAM   data)
{
  gint *n = (gint *) data;

  (*n)++;

  return TRUE;
}

typedef struct {
    GdkWin32Screen *screen;
    gint index;
} EnumMonitorData;

static BOOL CALLBACK
enum_monitor (HMONITOR hmonitor,
              HDC      hdc,
              LPRECT   rect,
              LPARAM   param)
{
  /* The struct MONITORINFOEX definition is for some reason different
   * in the winuser.h bundled with mingw64 from that in MSDN and the
   * official 32-bit mingw (the MONITORINFO part is in a separate "mi"
   * member). So to keep this easily compileable with either, repeat
   * the MSDN definition it here.
   */
  typedef struct tagMONITORINFOEXA2 {
    DWORD cbSize;
    RECT  rcMonitor;
    RECT  rcWork;
    DWORD dwFlags;
    CHAR szDevice[CCHDEVICENAME];
  } MONITORINFOEXA2;

  EnumMonitorData *data = (EnumMonitorData *) param;
  GdkWin32Monitor *monitor;
  MONITORINFOEXA2 monitor_info;
  HDC hDC;

  g_assert (data->index < data->screen->num_monitors);

  monitor = data->screen->monitors + data->index;

  monitor_info.cbSize = sizeof (MONITORINFOEXA2);
  GetMonitorInfoA (hmonitor, (MONITORINFO *) &monitor_info);

#ifndef MONITORINFOF_PRIMARY
#define MONITORINFOF_PRIMARY 1
#endif

  monitor->name = g_strdup (monitor_info.szDevice);
  hDC = CreateDCA ("DISPLAY", monitor_info.szDevice, NULL, NULL);
  monitor->width_mm = GetDeviceCaps (hDC, HORZSIZE);
  monitor->height_mm = GetDeviceCaps (hDC, VERTSIZE);
  DeleteDC (hDC);
  monitor->rect.x = monitor_info.rcMonitor.left;
  monitor->rect.y = monitor_info.rcMonitor.top;
  monitor->rect.width = monitor_info.rcMonitor.right - monitor_info.rcMonitor.left;
  monitor->rect.height = monitor_info.rcMonitor.bottom - monitor_info.rcMonitor.top;

  if (monitor_info.dwFlags & MONITORINFOF_PRIMARY && data->index != 0)
    {
      /* Put primary monitor at index 0, just in case somebody needs
       * to know which one is the primary.
       */
      GdkWin32Monitor temp = *monitor;
      *monitor = data->screen->monitors[0];
      data->screen->monitors[0] = temp;
    }

  data->index++;

  return TRUE;
}

void
_gdk_monitor_init (GdkWin32Screen *screen)
{
  gint count;
  EnumMonitorData data;
  gint i;

  count = 0;
  EnumDisplayMonitors (NULL, NULL, count_monitor, (LPARAM) &count);
  screen->num_monitors = count;

  screen->monitors = g_renew (GdkWin32Monitor, screen->monitors, screen->num_monitors);

  data.screen = screen;
  data.index = 0;
  EnumDisplayMonitors (NULL, NULL, enum_monitor, (LPARAM) &data);

  _gdk_offset_x = G_MININT;
  _gdk_offset_y = G_MININT;

  /* Calculate offset */
  for (i = 0; i < screen->num_monitors; i++)
    {
      GdkRectangle *rect = &screen->monitors[i].rect;
      _gdk_offset_x = MAX (_gdk_offset_x, -rect->x);
      _gdk_offset_y = MAX (_gdk_offset_y, -rect->y);
    }
  GDK_NOTE (MISC, g_print ("Multi-monitor offset: (%d,%d)\n",
                           _gdk_offset_x, _gdk_offset_y));

  /* Translate monitor coords into GDK coordinate space */
  for (i = 0; i < screen->num_monitors; i++)
    {
      GdkRectangle *rect = &screen->monitors[i].rect;
      rect->x += _gdk_offset_x;
      rect->y += _gdk_offset_y;
      GDK_NOTE (MISC, g_print ("Monitor %d: %dx%d@%+d%+d\n", i,
                               rect->width, rect->height, rect->x, rect->y));
    }
}

static GdkDisplay *
gdk_win32_screen_get_display (GdkScreen *screen)
{
  return _gdk_display;
}

static gint
gdk_win32_screen_get_width (GdkScreen *screen)
{
  return GDK_WIN32_SCREEN (screen)->root_window->width;
}

static gint
gdk_win32_screen_get_height (GdkScreen *screen)
{
  return GDK_WIN32_SCREEN (screen)->root_window->height;
}

static gint
gdk_win32_screen_get_width_mm (GdkScreen *screen)
{
  return (double) gdk_screen_get_width (screen) / GetDeviceCaps (_gdk_display_hdc, LOGPIXELSX) * 25.4;
}

static gint
gdk_win32_screen_get_height_mm (GdkScreen *screen)
{
  return (double) gdk_screen_get_height (screen) / GetDeviceCaps (_gdk_display_hdc, LOGPIXELSY) * 25.4;
}

static GdkWindow *
gdk_win32_screen_get_root_window (GdkScreen *screen)
{
  return GDK_WIN32_SCREEN (screen)->root_window;
}

static gint
gdk_win32_screen_get_n_monitors (GdkScreen *screen)
{
  g_return_val_if_fail (screen == gdk_display_get_default_screen (gdk_display_get_default ()), 0);

  return GDK_WIN32_SCREEN (screen)->num_monitors;
}

static gint
gdk_win32_screen_get_primary_monitor (GdkScreen *screen)
{
  g_return_val_if_fail (screen == gdk_display_get_default_screen (gdk_display_get_default ()), 0);

  return 0;
}

static gint
gdk_win32_screen_get_monitor_width_mm (GdkScreen *screen,
                                       gint       num_monitor)
{
  GdkWin32Screen *win32_screen = GDK_WIN32_SCREEN (screen);

  g_return_val_if_fail (screen == gdk_display_get_default_screen (gdk_display_get_default ()), 0);
  g_return_val_if_fail (num_monitor < win32_screen->num_monitors, 0);

  return win32_screen->monitors[num_monitor].width_mm;
}

static gint
gdk_win32_screen_get_monitor_height_mm (GdkScreen *screen,
                                        gint       num_monitor)
{
  GdkWin32Screen *win32_screen = GDK_WIN32_SCREEN (screen);

  g_return_val_if_fail (screen == gdk_display_get_default_screen (gdk_display_get_default ()), 0);
  g_return_val_if_fail (num_monitor < win32_screen->num_monitors, 0);

  return win32_screen->monitors[num_monitor].height_mm;
}

static gchar *
gdk_win32_screen_get_monitor_plug_name (GdkScreen *screen,
                                        gint       num_monitor)
{
  GdkWin32Screen *win32_screen = GDK_WIN32_SCREEN (screen);

  g_return_val_if_fail (screen == gdk_display_get_default_screen (gdk_display_get_default ()), NULL);
  g_return_val_if_fail (num_monitor < win32_screen->num_monitors, NULL);

  return g_strdup (win32_screen->monitors[num_monitor].name);
}

static void
gdk_win32_screen_get_monitor_geometry (GdkScreen    *screen,
                                       gint          num_monitor,
                                       GdkRectangle *dest)
{
  GdkWin32Screen *win32_screen = GDK_WIN32_SCREEN (screen);

  g_return_if_fail (screen == gdk_display_get_default_screen (gdk_display_get_default ()));
  g_return_if_fail (num_monitor < win32_screen->num_monitors);

  *dest = win32_screen->monitors[num_monitor].rect;
}

static gint
gdk_win32_screen_get_number (GdkScreen *screen)
{
  g_return_val_if_fail (screen == gdk_display_get_default_screen (gdk_display_get_default ()), 0);

  return 0;
}

static gchar *
gdk_win32_screen_make_display_name (GdkScreen *screen)
{
  return g_strdup (gdk_display_get_name (_gdk_display));
}

static GdkWindow *
gdk_win32_screen_get_active_window (GdkScreen *screen)
{
  g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL);

  return NULL;
}

static GList *
gdk_win32_screen_get_window_stack (GdkScreen *screen)
{
  g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL);

  return NULL;
}

static gboolean
gdk_win32_screen_is_composited (GdkScreen *screen)
{
  if (GDK_WIN32_SCREEN (screen)->always_composited)
    return TRUE;
  else
    {
      gboolean is_composited;

      if (DwmIsCompositionEnabled (&is_composited) != S_OK)
        return FALSE;
      return is_composited;
    }
}

static void
gdk_win32_screen_finalize (GObject *object)
{
  GdkWin32Screen *screen = GDK_WIN32_SCREEN (object);
  gint i;

  for (i = 0; i < screen->num_monitors; i++)
    g_free (screen->monitors[i].name);
  g_free (screen->monitors);

  G_OBJECT_CLASS (gdk_win32_screen_parent_class)->finalize (object);
}

static void
gdk_win32_screen_class_init (GdkWin32ScreenClass *klass)
{
  GObjectClass *object_class = G_OBJECT_CLASS (klass);
  GdkScreenClass *screen_class = GDK_SCREEN_CLASS (klass);

  object_class->finalize = gdk_win32_screen_finalize;

  screen_class->get_display = gdk_win32_screen_get_display;
  screen_class->get_width = gdk_win32_screen_get_width;
  screen_class->get_height = gdk_win32_screen_get_height;
  screen_class->get_width_mm = gdk_win32_screen_get_width_mm;
  screen_class->get_height_mm = gdk_win32_screen_get_height_mm;
  screen_class->get_number = gdk_win32_screen_get_number;
  screen_class->get_root_window = gdk_win32_screen_get_root_window;
  screen_class->get_n_monitors = gdk_win32_screen_get_n_monitors;
  screen_class->get_primary_monitor = gdk_win32_screen_get_primary_monitor;
  screen_class->get_monitor_width_mm = gdk_win32_screen_get_monitor_width_mm;
  screen_class->get_monitor_height_mm = gdk_win32_screen_get_monitor_height_mm;
  screen_class->get_monitor_plug_name = gdk_win32_screen_get_monitor_plug_name;
  screen_class->get_monitor_geometry = gdk_win32_screen_get_monitor_geometry;
  screen_class->get_monitor_workarea = gdk_win32_screen_get_monitor_geometry;
  screen_class->get_system_visual = _gdk_win32_screen_get_system_visual;
  screen_class->get_rgba_visual = _gdk_win32_screen_get_rgba_visual;
  screen_class->is_composited = gdk_win32_screen_is_composited;
  screen_class->make_display_name = gdk_win32_screen_make_display_name;
  screen_class->get_active_window = gdk_win32_screen_get_active_window;
  screen_class->get_window_stack = gdk_win32_screen_get_window_stack;
  screen_class->get_setting = _gdk_win32_screen_get_setting;
  screen_class->visual_get_best_depth = _gdk_win32_screen_visual_get_best_depth;
  screen_class->visual_get_best_type = _gdk_win32_screen_visual_get_best_type;
  screen_class->visual_get_best = _gdk_win32_screen_visual_get_best;
  screen_class->visual_get_best_with_depth = _gdk_win32_screen_visual_get_best_with_depth;
  screen_class->visual_get_best_with_type = _gdk_win32_screen_visual_get_best_with_type;
  screen_class->visual_get_best_with_both = _gdk_win32_screen_visual_get_best_with_both;
  screen_class->query_depths = _gdk_win32_screen_query_depths;
  screen_class->query_visual_types = _gdk_win32_screen_query_visual_types;
  screen_class->list_visuals = _gdk_win32_screen_list_visuals;
}