kc3-lang/SDL/src/video/offscreen/SDL_offscreenframebuffer.c

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• Hash : 9130f7c3
  Author :
  Date : 2021-01-02T10:25:38
  

  Updated copyright for 2021

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• src/video/offscreen/SDL_offscreenframebuffer.c

• /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2021 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"
  
  #if SDL_VIDEO_DRIVER_OFFSCREEN
  
  #include "../SDL_sysvideo.h"
  #include "SDL_offscreenframebuffer_c.h"
  
  
  #define OFFSCREEN_SURFACE   "_SDL_DummySurface"
  
  int SDL_OFFSCREEN_CreateWindowFramebuffer(_THIS, SDL_Window * window, Uint32 * format, void ** pixels, int *pitch)
  {
      SDL_Surface *surface;
      const Uint32 surface_format = SDL_PIXELFORMAT_RGB888;
      int w, h;
      int bpp;
      Uint32 Rmask, Gmask, Bmask, Amask;
  
      /* Free the old framebuffer surface */
      surface = (SDL_Surface *) SDL_GetWindowData(window, OFFSCREEN_SURFACE);
      SDL_FreeSurface(surface);
  
      /* Create a new one */
      SDL_PixelFormatEnumToMasks(surface_format, &bpp, &Rmask, &Gmask, &Bmask, &Amask);
      SDL_GetWindowSize(window, &w, &h);
      surface = SDL_CreateRGBSurface(0, w, h, bpp, Rmask, Gmask, Bmask, Amask);
      if (!surface) {
          return -1;
      }
  
      /* Save the info and return! */
      SDL_SetWindowData(window, OFFSCREEN_SURFACE, surface);
      *format = surface_format;
      *pixels = surface->pixels;
      *pitch = surface->pitch;
      return 0;
  }
  
  int SDL_OFFSCREEN_UpdateWindowFramebuffer(_THIS, SDL_Window * window, const SDL_Rect * rects, int numrects)
  {
      static int frame_number;
      SDL_Surface *surface;
  
      surface = (SDL_Surface *) SDL_GetWindowData(window, OFFSCREEN_SURFACE);
      if (!surface) {
          return SDL_SetError("Couldn't find offscreen surface for window");
      }
  
      /* Send the data to the display */
      if (SDL_getenv("SDL_VIDEO_OFFSCREEN_SAVE_FRAMES")) {
          char file[128];
          SDL_snprintf(file, sizeof(file), "SDL_window%d-%8.8d.bmp",
                       SDL_GetWindowID(window), ++frame_number);
          SDL_SaveBMP(surface, file);
      }
      return 0;
  }
  
  void SDL_OFFSCREEN_DestroyWindowFramebuffer(_THIS, SDL_Window * window)
  {
      SDL_Surface *surface;
  
      surface = (SDL_Surface *) SDL_SetWindowData(window, OFFSCREEN_SURFACE, NULL);
      SDL_FreeSurface(surface);
  }
  
  #endif /* SDL_VIDEO_DRIVER_OFFSCREEN */
  
  /* vi: set ts=4 sw=4 expandtab: */
  

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