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

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• Hash : 76392f4f
  Author :
  Date : 2023-01-11T19:45:01
  

  Handle DPI scaling in SDL_GetWindowSurface
  
  Fixes DPI awareness of testdrawchessboard (previously, the surface was
  being created in points instead of pixels, resulting in the demo app
  only drawing in a corner of the screen on High-DPI displays)
  
  *_CreateWindowFramebuffer()/*_UpdateWindowFramebuffer(): are updated
  to use SDL_GetWindowSizeInPixels instead of SDL_GetWindowSize() or
  window->w/window->h.
  
  Most of the _CreateWindowFramebuffer backends are untested except
  for Windows.
  
  Fixes #7047
  
  (cherry picked from commit 67c91353e01f6f2c0cc80c17eeddbad6def7cb01)
  

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• src/video/offscreen/SDL_offscreenframebuffer.c

• /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2023 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;
  
      /* Free the old framebuffer surface */
      SDL_OFFSCREEN_DestroyWindowFramebuffer(_this, window);
  
      /* Create a new one */
      SDL_GetWindowSizeInPixels(window, &w, &h);
      surface = SDL_CreateRGBSurfaceWithFormat(0, w, h, 0, surface_format);
      if (surface == NULL) {
          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 == NULL) {
          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];
          (void)SDL_snprintf(file, sizeof(file), "SDL_window%" SDL_PRIu32 "-%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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