kc3-lang/SDL/src/video/n3ds/SDL_n3dsframebuffer.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/n3ds/SDL_n3dsframebuffer.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"
  
  #ifdef SDL_VIDEO_DRIVER_N3DS
  
  #include "../SDL_sysvideo.h"
  #include "SDL_n3dsframebuffer_c.h"
  #include "SDL_n3dsvideo.h"
  
  #define N3DS_SURFACE "_SDL_N3DSSurface"
  
  typedef struct
  {
      int width, height;
  } Dimensions;
  
  SDL_FORCE_INLINE void FreePreviousWindowFramebuffer(SDL_Window *window);
  SDL_FORCE_INLINE SDL_Surface *CreateNewWindowFramebuffer(SDL_Window *window);
  SDL_FORCE_INLINE void CopyFramebuffertoN3DS(u32 *dest, const Dimensions dest_dim, const u32 *source, const Dimensions source_dim);
  SDL_FORCE_INLINE int GetDestOffset(int x, int y, int dest_width);
  SDL_FORCE_INLINE int GetSourceOffset(int x, int y, int source_width);
  SDL_FORCE_INLINE void FlushN3DSBuffer(const void *buffer, u32 bufsize, gfxScreen_t screen);
  
  int SDL_N3DS_CreateWindowFramebuffer(_THIS, SDL_Window *window, Uint32 *format, void **pixels, int *pitch)
  {
      SDL_Surface *framebuffer;
  
      FreePreviousWindowFramebuffer(window);
      framebuffer = CreateNewWindowFramebuffer(window);
  
      if (framebuffer == NULL) {
          return SDL_OutOfMemory();
      }
  
      SDL_SetWindowData(window, N3DS_SURFACE, framebuffer);
      *format = FRAMEBUFFER_FORMAT;
      *pixels = framebuffer->pixels;
      *pitch = framebuffer->pitch;
      return 0;
  }
  
  SDL_FORCE_INLINE void
  FreePreviousWindowFramebuffer(SDL_Window *window)
  {
      SDL_Surface *surface = (SDL_Surface *)SDL_GetWindowData(window, N3DS_SURFACE);
      SDL_FreeSurface(surface);
  }
  
  SDL_FORCE_INLINE SDL_Surface *
  CreateNewWindowFramebuffer(SDL_Window *window)
  {
      int w, h, bpp;
      Uint32 Rmask, Gmask, Bmask, Amask;
      SDL_PixelFormatEnumToMasks(FRAMEBUFFER_FORMAT, &bpp, &Rmask, &Gmask, &Bmask, &Amask);
      SDL_GetWindowSizeInPixels(window, &w, &h);
      return SDL_CreateRGBSurface(0, w, h, bpp, Rmask, Gmask, Bmask, Amask);
  }
  
  int SDL_N3DS_UpdateWindowFramebuffer(_THIS, SDL_Window *window, const SDL_Rect *rects, int numrects)
  {
      SDL_WindowData *drv_data = (SDL_WindowData *)window->driverdata;
      SDL_Surface *surface;
      u16 width, height;
      u32 *framebuffer;
      u32 bufsize;
  
      surface = (SDL_Surface *)SDL_GetWindowData(window, N3DS_SURFACE);
      if (surface == NULL) {
          return SDL_SetError("%s: Unable to get the window surface.", __func__);
      }
  
      /* Get the N3DS internal framebuffer and its size */
      framebuffer = (u32 *)gfxGetFramebuffer(drv_data->screen, GFX_LEFT, &width, &height);
      bufsize = width * height * 4;
  
      CopyFramebuffertoN3DS(framebuffer, (Dimensions){ width, height },
                            surface->pixels, (Dimensions){ surface->w, surface->h });
      FlushN3DSBuffer(framebuffer, bufsize, drv_data->screen);
  
      return 0;
  }
  
  SDL_FORCE_INLINE void
  CopyFramebuffertoN3DS(u32 *dest, const Dimensions dest_dim, const u32 *source, const Dimensions source_dim)
  {
      int rows = SDL_min(dest_dim.width, source_dim.height);
      int cols = SDL_min(dest_dim.height, source_dim.width);
      for (int y = 0; y < rows; ++y) {
          for (int x = 0; x < cols; ++x) {
              SDL_memcpy(
                  dest + GetDestOffset(x, y, dest_dim.width),
                  source + GetSourceOffset(x, y, source_dim.width),
                  4);
          }
      }
  }
  
  SDL_FORCE_INLINE int
  GetDestOffset(int x, int y, int dest_width)
  {
      return dest_width - y - 1 + dest_width * x;
  }
  
  SDL_FORCE_INLINE int
  GetSourceOffset(int x, int y, int source_width)
  {
      return x + y * source_width;
  }
  
  SDL_FORCE_INLINE void
  FlushN3DSBuffer(const void *buffer, u32 bufsize, gfxScreen_t screen)
  {
      GSPGPU_FlushDataCache(buffer, bufsize);
      gfxScreenSwapBuffers(screen, false);
  }
  
  void SDL_N3DS_DestroyWindowFramebuffer(_THIS, SDL_Window *window)
  {
      SDL_Surface *surface;
      surface = (SDL_Surface *)SDL_SetWindowData(window, N3DS_SURFACE, NULL);
      SDL_FreeSurface(surface);
  }
  
  #endif /* SDL_VIDEO_DRIVER_N3DS */
  
  /* vi: set sts=4 ts=4 sw=4 expandtab: */
  

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