kc3-lang/SDL/src/render/software/SDL_drawpoint.c

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• Hash : b88ca1b4
  Author :
  Date : 2015-02-10T16:28:56
  

  the last parameter of XChangeProperty is the number of elements.. and when the element format is 32.. the element is "long" so we have 5 long elements here.
  
  Yes this seems confusing as on mac+linux Long is either 32 or 64bits depending on the architecture, but this is how the X11 protocol is defined. Thus 5 is the correct value for the nelts here.  Not 5 or 10 depending on the architecture.
  
  More info on the confusion https://bugs.freedesktop.org/show_bug.cgi?id=16802
  

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• src/render/software/SDL_drawpoint.c

• /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2014 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_RENDER_DISABLED
  
  #include "SDL_draw.h"
  #include "SDL_drawpoint.h"
  
  
  int
  SDL_DrawPoint(SDL_Surface * dst, int x, int y, Uint32 color)
  {
      if (!dst) {
          return SDL_SetError("Passed NULL destination surface");
      }
  
      /* This function doesn't work on surfaces < 8 bpp */
      if (dst->format->BitsPerPixel < 8) {
          return SDL_SetError("SDL_DrawPoint(): Unsupported surface format");
      }
  
      /* Perform clipping */
      if (x < dst->clip_rect.x || y < dst->clip_rect.y ||
          x >= (dst->clip_rect.x + dst->clip_rect.w) ||
          y >= (dst->clip_rect.y + dst->clip_rect.h)) {
          return 0;
      }
  
      switch (dst->format->BytesPerPixel) {
      case 1:
          DRAW_FASTSETPIXELXY1(x, y);
          break;
      case 2:
          DRAW_FASTSETPIXELXY2(x, y);
          break;
      case 3:
          return SDL_Unsupported();
      case 4:
          DRAW_FASTSETPIXELXY4(x, y);
          break;
      }
      return 0;
  }
  
  int
  SDL_DrawPoints(SDL_Surface * dst, const SDL_Point * points, int count,
                 Uint32 color)
  {
      int minx, miny;
      int maxx, maxy;
      int i;
      int x, y;
  
      if (!dst) {
          return SDL_SetError("Passed NULL destination surface");
      }
  
      /* This function doesn't work on surfaces < 8 bpp */
      if (dst->format->BitsPerPixel < 8) {
          return SDL_SetError("SDL_DrawPoints(): Unsupported surface format");
      }
  
      minx = dst->clip_rect.x;
      maxx = dst->clip_rect.x + dst->clip_rect.w - 1;
      miny = dst->clip_rect.y;
      maxy = dst->clip_rect.y + dst->clip_rect.h - 1;
  
      for (i = 0; i < count; ++i) {
          x = points[i].x;
          y = points[i].y;
  
          if (x < minx || x > maxx || y < miny || y > maxy) {
              continue;
          }
  
          switch (dst->format->BytesPerPixel) {
          case 1:
              DRAW_FASTSETPIXELXY1(x, y);
              break;
          case 2:
              DRAW_FASTSETPIXELXY2(x, y);
              break;
          case 3:
              return SDL_Unsupported();
          case 4:
              DRAW_FASTSETPIXELXY4(x, y);
              break;
          }
      }
      return 0;
  }
  
  #endif /* !SDL_RENDER_DISABLED */
  
  /* vi: set ts=4 sw=4 expandtab: */
  

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