SDL3/sdl_touch.cpp

 
#include <freerdp/config.h>
 
#include "sdl_touch.hpp"
#include "sdl_context.hpp"
#include "sdl_prefs.hpp"
 
#include <winpr/wtypes.h>
#include <winpr/assert.h>
 
#include <freerdp/freerdp.h>
#include <freerdp/gdi/gdi.h>
 
#include <SDL3/SDL.h>
 
[[nodiscard]] static bool send_mouse_wheel(SdlContext* sdl, UINT16 flags, INT32 avalue)
{
  WINPR_ASSERT(sdl);
  if (avalue < 0)
  {
    flags |= PTR_FLAGS_WHEEL_NEGATIVE;
    avalue = -avalue;
  }
 
  while (avalue > 0)
  {
    const UINT16 cval = (avalue > 0xFF) ? 0xFF : static_cast<UINT16>(avalue);
    UINT16 cflags = flags | cval;
    /* Convert negative values to 9bit twos complement */
    if (flags & PTR_FLAGS_WHEEL_NEGATIVE)
      cflags = (flags & 0xFF00) | (0x100 - cval);
    if (!freerdp_client_send_wheel_event(sdl->common(), cflags))
      return FALSE;
 
    avalue -= cval;
  }
  return TRUE;
}
 
[[nodiscard]] static UINT32 sdl_scale_pressure(const float pressure)
{
  const float val = pressure * 0x400; /* [MS-RDPEI] 2.2.3.3.1.1 RDPINPUT_TOUCH_CONTACT */
  if (val < 0.0f)
    return 0;
  if (val > 0x400)
    return 0x400;
  return static_cast<UINT32>(val);
}
 
bool SdlTouch::touchUp(SdlContext* sdl, const SDL_TouchFingerEvent& ev)
{
  WINPR_ASSERT(sdl);
 
  return freerdp_client_handle_touch(sdl->common(), FREERDP_TOUCH_UP | FREERDP_TOUCH_HAS_PRESSURE,
                                     static_cast<INT32>(ev.fingerID),
                                     sdl_scale_pressure(ev.pressure), static_cast<Sint32>(ev.x),
                                     static_cast<Sint32>(ev.y));
}
 
bool SdlTouch::touchCancel(SdlContext* sdl, const SDL_TouchFingerEvent& ev)
{
  WINPR_ASSERT(sdl);
 
  return freerdp_client_handle_touch(
      sdl->common(), FREERDP_TOUCH_CANCEL | FREERDP_TOUCH_HAS_PRESSURE,
      static_cast<INT32>(ev.fingerID), sdl_scale_pressure(ev.pressure), static_cast<Sint32>(ev.x),
      static_cast<Sint32>(ev.y));
}
 
bool SdlTouch::touchDown(SdlContext* sdl, const SDL_TouchFingerEvent& ev)
{
  WINPR_ASSERT(sdl);
 
  return freerdp_client_handle_touch(
      sdl->common(), FREERDP_TOUCH_DOWN | FREERDP_TOUCH_HAS_PRESSURE,
      static_cast<INT32>(ev.fingerID), sdl_scale_pressure(ev.pressure), static_cast<Sint32>(ev.x),
      static_cast<Sint32>(ev.y));
}
 
bool SdlTouch::touchMotion(SdlContext* sdl, const SDL_TouchFingerEvent& ev)
{
  WINPR_ASSERT(sdl);
 
  return freerdp_client_handle_touch(
      sdl->common(), FREERDP_TOUCH_MOTION | FREERDP_TOUCH_HAS_PRESSURE,
      static_cast<INT32>(ev.fingerID), sdl_scale_pressure(ev.pressure), static_cast<Sint32>(ev.x),
      static_cast<Sint32>(ev.y));
}
 
bool SdlTouch::handleEvent(SdlContext* sdl, const SDL_MouseMotionEvent& ev)
{
  WINPR_ASSERT(sdl);
 
  if (!sdl->getInputChannelContext().mouse_focus(ev.windowID))
    return FALSE;
 
  const BOOL relative =
      freerdp_client_use_relative_mouse_events(sdl->common()) && !sdl->hasCursor();
  auto x = static_cast<INT32>(relative ? ev.xrel : ev.x);
  auto y = static_cast<INT32>(relative ? ev.yrel : ev.y);
  return freerdp_client_send_button_event(sdl->common(), relative, PTR_FLAGS_MOVE, x, y);
}
 
bool SdlTouch::handleEvent(SdlContext* sdl, const SDL_MouseWheelEvent& ev)
{
  WINPR_ASSERT(sdl);
 
  const bool flipped = (ev.direction == SDL_MOUSEWHEEL_FLIPPED) &&
                       !SdlPref::instance()->get_bool("UseLocalMouseScrollDirection");
  const auto x = static_cast<INT32>(ev.x * (flipped ? -1.0f : 1.0f) * 120.0f);
  const auto y = static_cast<INT32>(ev.y * (flipped ? -1.0f : 1.0f) * 120.0f);
 
  /* [MS-RDPBCGR] 2.2.8.1.1.3.1.1.3 Pointer Event: a wheel rotation event carries no flags
   * besides PTR_FLAGS_WHEEL_NEGATIVE and the rotation itself, so the two axes cannot share
   * one event. Keep the flags apart, the horizontal rotation would otherwise be applied to
   * the vertical axis. */
  if (y != 0)
  {
    if (!send_mouse_wheel(sdl, PTR_FLAGS_WHEEL, y))
      return false;
  }
 
  if (x != 0)
  {
    if (!send_mouse_wheel(sdl, PTR_FLAGS_HWHEEL, x))
      return false;
  }
  return TRUE;
}
 
bool SdlTouch::handleEvent(SdlContext* sdl, const SDL_MouseButtonEvent& ev)
{
  UINT16 flags = 0;
  UINT16 xflags = 0;
 
  WINPR_ASSERT(sdl);
 
  if (ev.type == SDL_EVENT_MOUSE_BUTTON_DOWN)
  {
    flags |= PTR_FLAGS_DOWN;
    xflags |= PTR_XFLAGS_DOWN;
  }
 
  switch (ev.button)
  {
    case 1:
      flags |= PTR_FLAGS_BUTTON1;
      break;
    case 2:
      flags |= PTR_FLAGS_BUTTON3;
      break;
    case 3:
      flags |= PTR_FLAGS_BUTTON2;
      break;
    case 4:
      xflags |= PTR_XFLAGS_BUTTON1;
      break;
    case 5:
      xflags |= PTR_XFLAGS_BUTTON2;
      break;
    default:
      break;
  }
 
  const BOOL relative =
      freerdp_client_use_relative_mouse_events(sdl->common()) && !sdl->hasCursor();
  auto x = static_cast<INT32>(relative ? 0 : ev.x);
  auto y = static_cast<INT32>(relative ? 0 : ev.y);
 
  if ((flags & (~PTR_FLAGS_DOWN)) != 0)
    return freerdp_client_send_button_event(sdl->common(), relative, flags, x, y);
  else if ((xflags & (~PTR_XFLAGS_DOWN)) != 0)
    return freerdp_client_send_extended_button_event(sdl->common(), relative, xflags, x, y);
  else
    return TRUE;
}
 
bool SdlTouch::handleEvent(SdlContext* sdl, const SDL_TouchFingerEvent& ev)
{
  switch (ev.type)
  {
    case SDL_EVENT_FINGER_CANCELED:
      return SdlTouch::touchCancel(sdl, ev);
    case SDL_EVENT_FINGER_UP:
      return SdlTouch::touchUp(sdl, ev);
    case SDL_EVENT_FINGER_DOWN:
      return SdlTouch::touchDown(sdl, ev);
    case SDL_EVENT_FINGER_MOTION:
      return SdlTouch::touchMotion(sdl, ev);
    default:
      return false;
  }
}