kc3-lang/SDL/src/video/wayland/SDL_waylandkeyboard.h

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• Hash : 81479d87
  Author :
  Date : 2022-11-18T21:08:36
  

  wayland: keyboard: Cache text input parameters.
  
  Some applications (and embarrassingly, testime is one of them) call
  SDL_StartTextInput() or SDL_SetTextInputRect() every frame. On KDE/KWin
  with fcitx5, this causes there to be several preedit events every frame
  (particularly given some of the workarounds in Wayland_StartTextInput),
  which slows testime down to an unusable crawl.
  
  Instead, make SDL_StartTextInput() a no-op if text input is already
  enabled, and cache the input rect, only changing it when the new rect is
  actually different.
  
  With these changes, we only get preedit events (and hence
  SDL_TEXTEDITING events) when the preedit string actually changes. This
  matches the behaviour under XWayland, and works very smoothly.
  

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• src/video/wayland/SDL_waylandkeyboard.h

• /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
  
    This software is provided 'as-is', without any express or implied
    warranty.  In no event will the authors be held liable for any damages
    arising from the use of this software.
  
    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it
    freely, subject to the following restrictions:
  
    1. The origin of this software must not be misrepresented; you must not
       claim that you wrote the original software. If you use this software
       in a product, an acknowledgment in the product documentation would be
       appreciated but is not required.
    2. Altered source versions must be plainly marked as such, and must not be
       misrepresented as being the original software.
    3. This notice may not be removed or altered from any source distribution.
  */
  #include "../../SDL_internal.h"
  
  #ifndef SDL_waylandkeyboard_h_
  #define SDL_waylandkeyboard_h_
  
  typedef struct SDL_WaylandTextInput
  {
      struct zwp_text_input_v3 *text_input;
      SDL_Rect cursor_rect;
      SDL_bool has_preedit;
      SDL_bool is_enabled;
  } SDL_WaylandTextInput;
  
  extern int Wayland_InitKeyboard(_THIS);
  extern void Wayland_QuitKeyboard(_THIS);
  extern void Wayland_StartTextInput(_THIS);
  extern void Wayland_StopTextInput(_THIS);
  extern void Wayland_SetTextInputRect(_THIS, const SDL_Rect *rect);
  extern SDL_bool Wayland_HasScreenKeyboardSupport(_THIS);
  
  #endif /* SDL_waylandkeyboard_h_ */
  
  /* vi: set ts=4 sw=4 expandtab: */
  

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