SDL3/sdl_monitor.cpp

 
#include <freerdp/config.h>
 
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <algorithm>
 
#include <SDL3/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_context.hpp"
 
typedef struct
{
  RECTANGLE_16 area;
  RECTANGLE_16 workarea;
  BOOL primary;
} MONITOR_INFO;
 
typedef struct
{
  int nmonitors;
  RECTANGLE_16 area;
  RECTANGLE_16 workarea;
  MONITOR_INFO* monitors;
} VIRTUAL_SCREEN;
 
/* 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);
 
  int nmonitors = 0;
  auto ids = SDL_GetDisplays(&nmonitors);
 
  printf("listing %d monitors:\n", nmonitors);
  for (int i = 0; i < nmonitors; i++)
  {
    SDL_Rect rect = {};
    auto id = ids[i];
    const auto brc = SDL_GetDisplayBounds(id, &rect);
    const char* name = SDL_GetDisplayName(id);
 
    if (!brc)
      continue;
    printf("     %s [%u] [%s] %dx%d\t+%d+%d\n", (i == 0) ? "*" : " ", id, name, rect.w, rect.h,
           rect.x, rect.y);
  }
  SDL_free(ids);
  SDL_Quit();
  return 0;
}
 
[[nodiscard]] static BOOL sdl_apply_mon_max_size(SdlContext* sdl, UINT32* pMaxWidth,
                                                 UINT32* pMaxHeight)
{
  int32_t left = 0;
  int32_t right = 0;
  int32_t top = 0;
  int32_t bottom = 0;
 
  WINPR_ASSERT(pMaxWidth);
  WINPR_ASSERT(pMaxHeight);
 
  auto settings = sdl->context()->settings;
  WINPR_ASSERT(settings);
 
  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));
 
    left = std::min(monitor->x, left);
    top = std::min(monitor->y, top);
    right = std::max(monitor->x + monitor->width, right);
    bottom = std::max(monitor->y + monitor->height, bottom);
  }
 
  const int32_t w = right - left;
  const int32_t h = bottom - top;
 
  *pMaxWidth = WINPR_ASSERTING_INT_CAST(uint32_t, w);
  *pMaxHeight = WINPR_ASSERTING_INT_CAST(uint32_t, h);
  return TRUE;
}
 
[[nodiscard]] 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_RemoteApplicationMode))
    {
      /* RAIL requires full display coverage for 1:1 coordinates. Work area insets
       * are reported via SPI_SET_WORK_AREA instead of clipping session size. */
      SDL_Rect rect = {};
      if (SDL_GetDisplayBounds(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_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(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(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;
}
 
[[nodiscard]] static BOOL sdl_apply_display_properties(SdlContext* sdl)
{
  WINPR_ASSERT(sdl);
 
  rdpSettings* settings = sdl->context()->settings;
  WINPR_ASSERT(settings);
 
  std::vector<rdpMonitor> monitors;
  if (!freerdp_settings_get_bool(settings, FreeRDP_Fullscreen) &&
      !freerdp_settings_get_bool(settings, FreeRDP_UseMultimon))
  {
    if (freerdp_settings_get_bool(settings, FreeRDP_Workarea))
    {
      if (sdl->monitorIds().empty())
        return FALSE;
      const auto id = sdl->monitorIds().front();
      auto monitor = sdl->getDisplay(id);
      monitor.is_primary = true;
      monitor.x = 0;
      monitor.y = 0;
      monitors.emplace_back(monitor);
      return freerdp_settings_set_monitor_def_array_sorted(settings, monitors.data(),
                                                           monitors.size());
    }
    return TRUE;
  }
  for (const auto& id : sdl->monitorIds())
  {
    const auto monitor = sdl->getDisplay(id);
    monitors.emplace_back(monitor);
  }
  // With an explicit /monitors: list the first entry is the primary (like xfreerdp),
  // not whatever the local desktop considers primary.
  if (!monitors.empty() && (freerdp_settings_get_uint32(settings, FreeRDP_NumMonitorIds) > 0))
  {
    for (auto& monitor : monitors)
      monitor.is_primary = FALSE;
    monitors.at(0).is_primary = TRUE;
  }
  // /monitors: may select a subset that excludes the SDL primary. The
  // library rejects arrays without a primary, so promote the first entry
  // when none is marked.
  if (!monitors.empty() && std::none_of(monitors.cbegin(), monitors.cend(),
                                        [](const rdpMonitor& m) { return m.is_primary; }))
    monitors.at(0).is_primary = true;
  return freerdp_settings_set_monitor_def_array_sorted(settings, monitors.data(),
                                                       monitors.size());
}
 
[[nodiscard]] 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)
    {
      SDL_DisplayID id = 0;
      const auto& ids = sdl->monitorIds();
      if (!ids.empty())
      {
        id = ids.front();
      }
      sdl->setMonitorIds({ id });
    }
 
    if (!sdl_apply_display_properties(sdl))
      return FALSE;
    return sdl_apply_max_size(sdl, pMaxWidth, pMaxHeight);
  }
  return sdl_apply_mon_max_size(sdl, pMaxWidth, pMaxHeight);
}
 
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 auto& ids = sdl->getDisplayIds();
  auto nr = freerdp_settings_get_uint32(settings, FreeRDP_NumMonitorIds);
  /* Announce all monitors in RemoteApp mode so windows can maximize on secondary displays. */
  if ((nr == 0) && freerdp_settings_get_bool(settings, FreeRDP_RemoteApplicationMode) &&
      !freerdp_settings_get_bool(settings, FreeRDP_UseMultimon))
  {
    if (!freerdp_settings_set_bool(settings, FreeRDP_UseMultimon, TRUE))
      return FALSE;
  }
  if (nr == 0)
  {
    if (freerdp_settings_get_bool(settings, FreeRDP_UseMultimon))
      sdl->setMonitorIds(ids);
    else
    {
      sdl->setMonitorIds({ ids.front() });
    }
  }
  else
  {
    /* There were more IDs supplied than there are monitors */
    if (nr > ids.size())
    {
      WLog_ERR(TAG,
               "Found %" PRIu32 " monitor IDs, but only have %" PRIuz " monitors connected",
               nr, ids.size());
      return FALSE;
    }
 
    std::vector<SDL_DisplayID> 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);
 
      SDL_DisplayID id = *cur;
 
      /* the ID is no valid monitor index */
      if (std::find(ids.begin(), ids.end(), id) == ids.end())
      {
        WLog_ERR(TAG, "Supplied monitor ID[%" PRIuz "]=%" PRIu32 " is invalid", x, id);
        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(id);
    }
    sdl->setMonitorIds(used);
  }
 
  if (!sdl_apply_display_properties(sdl))
    return FALSE;
 
  auto size = static_cast<uint32_t>(sdl->monitorIds().size());
  if (!freerdp_settings_set_uint32(settings, FreeRDP_NumMonitorIds, size))
    return FALSE;
 
  return sdl_detect_single_window(sdl, pMaxWidth, pMaxHeight);
}