SDL2/sdl_monitor.cpp

 
#include <freerdp/config.h>
 
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <algorithm>
 
#include <SDL.h>
 
#include <winpr/assert.h>
#include <winpr/crt.h>
 
#include <freerdp/log.h>
 
#define TAG CLIENT_TAG("sdl")
 
#include "sdl_monitor.hpp"
#include "sdl_freerdp.hpp"
 
using MONITOR_INFO = struct
{
  RECTANGLE_16 area;
  RECTANGLE_16 workarea;
  BOOL primary;
};
 
using VIRTUAL_SCREEN = struct
{
  int nmonitors;
  RECTANGLE_16 area;
  RECTANGLE_16 workarea;
  MONITOR_INFO* monitors;
};
 
/* See MSDN Section on Multiple Display Monitors: http://msdn.microsoft.com/en-us/library/dd145071
 */
 
int sdl_list_monitors([[maybe_unused]] SdlContext* sdl)
{
  SDL_Init(SDL_INIT_VIDEO);
  const int nmonitors = SDL_GetNumVideoDisplays();
 
  printf("listing %d monitors:\n", nmonitors);
  for (int i = 0; i < nmonitors; i++)
  {
    SDL_Rect rect = {};
    const int brc = SDL_GetDisplayBounds(i, &rect);
    const char* name = SDL_GetDisplayName(i);
 
    if (brc != 0)
      continue;
    printf("     %s [%d] [%s] %dx%d\t+%d+%d\n", (i == 0) ? "*" : " ", i, name, rect.w, rect.h,
           rect.x, rect.y);
  }
 
  SDL_Quit();
  return 0;
}
 
static BOOL sdl_apply_max_size(SdlContext* sdl, UINT32* pMaxWidth, UINT32* pMaxHeight)
{
  WINPR_ASSERT(sdl);
  WINPR_ASSERT(pMaxWidth);
  WINPR_ASSERT(pMaxHeight);
 
  auto settings = sdl->context()->settings;
  WINPR_ASSERT(settings);
 
  *pMaxWidth = 0;
  *pMaxHeight = 0;
 
  for (size_t x = 0; x < freerdp_settings_get_uint32(settings, FreeRDP_MonitorCount); x++)
  {
    auto monitor = static_cast<const rdpMonitor*>(
        freerdp_settings_get_pointer_array(settings, FreeRDP_MonitorDefArray, x));
 
    if (freerdp_settings_get_bool(settings, FreeRDP_Fullscreen))
    {
      *pMaxWidth = WINPR_ASSERTING_INT_CAST(uint32_t, monitor->width);
      *pMaxHeight = WINPR_ASSERTING_INT_CAST(uint32_t, monitor->height);
    }
    else if (freerdp_settings_get_bool(settings, FreeRDP_Workarea))
    {
      SDL_Rect rect = {};
      SDL_GetDisplayUsableBounds(WINPR_ASSERTING_INT_CAST(int, monitor->orig_screen), &rect);
      *pMaxWidth = WINPR_ASSERTING_INT_CAST(uint32_t, rect.w);
      *pMaxHeight = WINPR_ASSERTING_INT_CAST(uint32_t, rect.h);
    }
    else if (freerdp_settings_get_uint32(settings, FreeRDP_PercentScreen) > 0)
    {
      SDL_Rect rect = {};
      SDL_GetDisplayUsableBounds(WINPR_ASSERTING_INT_CAST(int, monitor->orig_screen), &rect);
 
      *pMaxWidth = WINPR_ASSERTING_INT_CAST(uint32_t, rect.w);
      *pMaxHeight = WINPR_ASSERTING_INT_CAST(uint32_t, rect.h);
 
      if (freerdp_settings_get_bool(settings, FreeRDP_PercentScreenUseWidth))
        *pMaxWidth = (WINPR_ASSERTING_INT_CAST(uint32_t, rect.w) *
                      freerdp_settings_get_uint32(settings, FreeRDP_PercentScreen)) /
                     100;
 
      if (freerdp_settings_get_bool(settings, FreeRDP_PercentScreenUseHeight))
        *pMaxHeight = (WINPR_ASSERTING_INT_CAST(uint32_t, rect.h) *
                       freerdp_settings_get_uint32(settings, FreeRDP_PercentScreen)) /
                      100;
    }
    else if (freerdp_settings_get_uint32(settings, FreeRDP_DesktopWidth) &&
             freerdp_settings_get_uint32(settings, FreeRDP_DesktopHeight))
    {
      *pMaxWidth = freerdp_settings_get_uint32(settings, FreeRDP_DesktopWidth);
      *pMaxHeight = freerdp_settings_get_uint32(settings, FreeRDP_DesktopHeight);
    }
  }
  return TRUE;
}
 
#if SDL_VERSION_ATLEAST(2, 0, 10)
static UINT32 sdl_orientaion_to_rdp(SDL_DisplayOrientation orientation)
{
  switch (orientation)
  {
    case SDL_ORIENTATION_LANDSCAPE:
      return ORIENTATION_LANDSCAPE;
    case SDL_ORIENTATION_LANDSCAPE_FLIPPED:
      return ORIENTATION_LANDSCAPE_FLIPPED;
    case SDL_ORIENTATION_PORTRAIT_FLIPPED:
      return ORIENTATION_PORTRAIT_FLIPPED;
    case SDL_ORIENTATION_PORTRAIT:
    default:
      return ORIENTATION_PORTRAIT;
  }
}
#endif
 
/* a length in pixels at the given dots per inch, in millimetres (the unit of the physical size) */
static Uint32 to_mm(Uint32 pixels, float dpi)
{
  const auto inches = static_cast<float>(pixels) / dpi;
  return static_cast<Uint32>(std::lround(inches * 25.4f));
}
 
static BOOL sdl_apply_display_properties(SdlContext* sdl)
{
  WINPR_ASSERT(sdl);
 
  rdpSettings* settings = sdl->context()->settings;
  WINPR_ASSERT(settings);
 
  if (!freerdp_settings_get_bool(settings, FreeRDP_Fullscreen) &&
      !freerdp_settings_get_bool(settings, FreeRDP_UseMultimon))
    return TRUE;
 
  const UINT32 numIds = freerdp_settings_get_uint32(settings, FreeRDP_NumMonitorIds);
  std::vector<rdpMonitor> monitors;
 
  for (UINT32 x = 0; x < numIds; x++)
  {
    auto id = static_cast<const int*>(
        freerdp_settings_get_pointer_array(settings, FreeRDP_MonitorIds, x));
    WINPR_ASSERT(id);
 
    float ddpi = 1.0f;
    float hdpi = 1.0f;
    float vdpi = 1.0f;
    SDL_Rect rect = {};
 
    if (SDL_GetDisplayBounds(*id, &rect) < 0)
      return FALSE;
 
    if (SDL_GetDisplayDPI(*id, &ddpi, &hdpi, &vdpi) < 0)
      return FALSE;
 
    WINPR_ASSERT(rect.w > 0);
    WINPR_ASSERT(rect.h > 0);
    WINPR_ASSERT(ddpi > 0);
    WINPR_ASSERT(hdpi > 0);
    WINPR_ASSERT(vdpi > 0);
 
    bool highDpi = hdpi > 100;
 
    if (highDpi)
    {
      // HighDPI is problematic with SDL: We can only get native resolution by creating a
      // window. Work around this by checking the supported resolutions (and keep maximum)
      // Also scale the DPI
      const SDL_Rect scaleRect = rect;
      for (int i = 0; i < SDL_GetNumDisplayModes(*id); i++)
      {
        SDL_DisplayMode mode = {};
        SDL_GetDisplayMode(WINPR_ASSERTING_INT_CAST(int, x), i, &mode);
 
        if (mode.w > rect.w)
        {
          rect.w = mode.w;
          rect.h = mode.h;
        }
        else if (mode.w == rect.w)
        {
          if (mode.h > rect.h)
          {
            rect.w = mode.w;
            rect.h = mode.h;
          }
        }
      }
 
      const float dw = 1.0f * static_cast<float>(rect.w) / static_cast<float>(scaleRect.w);
      const float dh = 1.0f * static_cast<float>(rect.h) / static_cast<float>(scaleRect.h);
      hdpi /= dw;
      vdpi /= dh;
    }
 
#if SDL_VERSION_ATLEAST(2, 0, 10)
    const SDL_DisplayOrientation orientation = SDL_GetDisplayOrientation(*id);
    const UINT32 rdp_orientation = sdl_orientaion_to_rdp(orientation);
#else
    const UINT32 rdp_orientation = ORIENTATION_LANDSCAPE;
#endif
 
    rdpMonitor monitor = {};
 
    /* windows uses 96 dpi as 'default' and the scale factors are in percent. */
    const auto factor = ddpi / 96.0f * 100.0f;
    monitor.orig_screen = x;
    monitor.x = rect.x;
    monitor.y = rect.y;
    monitor.width = rect.w;
    monitor.height = rect.h;
    monitor.is_primary = x == 0;
    monitor.attributes.desktopScaleFactor = static_cast<UINT32>(factor);
    monitor.attributes.deviceScaleFactor = 100;
    monitor.attributes.orientation = rdp_orientation;
    monitor.attributes.physicalWidth = to_mm(WINPR_ASSERTING_INT_CAST(uint32_t, rect.w), hdpi);
    monitor.attributes.physicalHeight = to_mm(WINPR_ASSERTING_INT_CAST(uint32_t, rect.h), vdpi);
    monitors.emplace_back(monitor);
  }
  return freerdp_settings_set_monitor_def_array_sorted(settings, monitors.data(),
                                                       monitors.size());
}
 
static BOOL sdl_detect_single_window(SdlContext* sdl, UINT32* pMaxWidth, UINT32* pMaxHeight)
{
  WINPR_ASSERT(sdl);
  WINPR_ASSERT(pMaxWidth);
  WINPR_ASSERT(pMaxHeight);
 
  rdpSettings* settings = sdl->context()->settings;
  WINPR_ASSERT(settings);
 
  if ((!freerdp_settings_get_bool(settings, FreeRDP_UseMultimon) &&
       !freerdp_settings_get_bool(settings, FreeRDP_SpanMonitors)) ||
      (freerdp_settings_get_bool(settings, FreeRDP_Workarea) &&
       !freerdp_settings_get_bool(settings, FreeRDP_RemoteApplicationMode)))
  {
    /* If no monitors were specified on the command-line then set the current monitor as active
     */
    if (freerdp_settings_get_uint32(settings, FreeRDP_NumMonitorIds) == 0)
    {
      const size_t id = (!sdl->windows.empty())
                            ? WINPR_ASSERTING_INT_CAST(
                                  uint32_t, sdl->windows.begin()->second.displayIndex())
                            : 0;
      if (!freerdp_settings_set_pointer_len(settings, FreeRDP_MonitorIds, &id, 1))
        return FALSE;
    }
    else
    {
 
      /* Always sets number of monitors from command-line to just 1.
       * If the monitor is invalid then we will default back to current monitor
       * later as a fallback. So, there is no need to validate command-line entry here.
       */
      if (!freerdp_settings_set_uint32(settings, FreeRDP_NumMonitorIds, 1))
        return FALSE;
    }
 
    // TODO: Fill monitor struct
    if (!sdl_apply_display_properties(sdl))
      return FALSE;
    return sdl_apply_max_size(sdl, pMaxWidth, pMaxHeight);
  }
  return TRUE;
}
 
BOOL sdl_detect_monitors(SdlContext* sdl, UINT32* pMaxWidth, UINT32* pMaxHeight)
{
  WINPR_ASSERT(sdl);
  WINPR_ASSERT(pMaxWidth);
  WINPR_ASSERT(pMaxHeight);
 
  rdpSettings* settings = sdl->context()->settings;
  WINPR_ASSERT(settings);
 
  const int numDisplays = SDL_GetNumVideoDisplays();
  auto nr = freerdp_settings_get_uint32(settings, FreeRDP_NumMonitorIds);
  if (numDisplays < 0)
    return FALSE;
 
  if (nr == 0)
  {
    if (!freerdp_settings_set_pointer_len(settings, FreeRDP_MonitorIds, nullptr,
                                          static_cast<size_t>(numDisplays)))
      return FALSE;
    for (size_t x = 0; x < static_cast<size_t>(numDisplays); x++)
    {
      if (!freerdp_settings_set_pointer_array(settings, FreeRDP_MonitorIds, x, &x))
        return FALSE;
    }
  }
  else
  {
 
    /* There were more IDs supplied than there are monitors */
    if (nr > static_cast<UINT32>(numDisplays))
    {
      WLog_ERR(TAG, "Found %" PRIu32 " monitor IDs, but only have %d monitors connected", nr,
               numDisplays);
      return FALSE;
    }
 
    std::vector<UINT32> used;
    for (size_t x = 0; x < nr; x++)
    {
      auto cur = static_cast<const UINT32*>(
          freerdp_settings_get_pointer_array(settings, FreeRDP_MonitorIds, x));
      WINPR_ASSERT(cur);
 
      auto id = *cur;
 
      /* the ID is no valid monitor index */
      if (id >= nr)
      {
        WLog_ERR(TAG,
                 "Supplied monitor ID[%" PRIuz "]=%" PRIu32 " is invalid, only [0-%" PRIu32
                 "] are allowed",
                 x, id, nr - 1);
        return FALSE;
      }
 
      /* The ID is already taken */
      if (std::find(used.begin(), used.end(), id) != used.end())
      {
        WLog_ERR(TAG, "Duplicate monitor ID[%" PRIuz "]=%" PRIu32 " detected", x, id);
        return FALSE;
      }
      used.push_back(*cur);
    }
  }
 
  if (!sdl_apply_display_properties(sdl))
    return FALSE;
 
  return sdl_detect_single_window(sdl, pMaxWidth, pMaxHeight);
}
 
INT64 sdl_monitor_id_for_index(SdlContext* sdl, UINT32 index)
{
  WINPR_ASSERT(sdl);
  auto settings = sdl->context()->settings;
 
  auto nr = freerdp_settings_get_uint32(settings, FreeRDP_NumMonitorIds);
  if (nr == 0)
    return index;
 
  if (nr <= index)
    return -1;
 
  auto cur = static_cast<const UINT32*>(
      freerdp_settings_get_pointer_array(settings, FreeRDP_MonitorIds, index));
  WINPR_ASSERT(cur);
  return *cur;
}