kc3-lang/SDL/src/video/SDL_fillrect.c

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• Hash : 3bf7994f
  Author :
  Date : 2021-09-27T14:38:12
  

  Add and use `SDL_FALLTHROUGH` for fallthroughs Case fallthrough warnings can be suppressed using the __fallthrough__ compiler attribute. Unfortunately, not all compilers have this attribute, or even have __has_attribute to check if they have the __fallthrough__ attribute. [[fallthrough]] is also available in C++17 and the next C2x, but not everyone uses C++17 or C2x. So define the SDL_FALLTHROUGH macro to deal with those problems - if we are using C++17 or C2x, it expands to [[fallthrough]]; else if the compiler has __has_attribute and has the __fallthrough__ attribute, then it expands to __attribute__((__fallthrough__)); else it expands to an empty statement, with a /* fallthrough */ comment (it's a do {} while (0) statement, because users of this macro need to use a semicolon, because [[fallthrough]] and __attribute__((__fallthrough__)) require a semicolon). Clang before Clang 10 and GCC before GCC 7 have problems with using __attribute__ as a sole statement and warn about a "declaration not declaring anything", so fall back to using the /* fallthrough */ comment if we are using those older compiler versions. Applications using SDL are also free to use this macro (because it is defined in begin_code.h). All existing /* fallthrough */ comments have been replaced with this macro. Some of them were unnecessary because they were the last case in a switch; using SDL_FALLTHROUGH in those cases would result in a compile error on compilers that support __fallthrough__, for having a __attribute__((__fallthrough__)) statement that didn't immediately precede a case label.

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• src/video/SDL_fillrect.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"
  
  #include "SDL_video.h"
  #include "SDL_blit.h"
  #include "SDL_cpuinfo.h"
  
  
  #ifdef __SSE__
  /* *INDENT-OFF* */
  
  #if defined(_MSC_VER) && !defined(__clang__)
  #define SSE_BEGIN \
      __m128 c128; \
      c128.m128_u32[0] = color; \
      c128.m128_u32[1] = color; \
      c128.m128_u32[2] = color; \
      c128.m128_u32[3] = color;
  #else
  #define SSE_BEGIN \
      __m128 c128; \
      DECLARE_ALIGNED(Uint32, cccc[4], 16); \
      cccc[0] = color; \
      cccc[1] = color; \
      cccc[2] = color; \
      cccc[3] = color; \
      c128 = *(__m128 *)cccc;
  #endif
  
  #define SSE_WORK \
      for (i = n / 64; i--;) { \
          _mm_stream_ps((float *)(p+0), c128); \
          _mm_stream_ps((float *)(p+16), c128); \
          _mm_stream_ps((float *)(p+32), c128); \
          _mm_stream_ps((float *)(p+48), c128); \
          p += 64; \
      }
  
  #define SSE_END
  
  #define DEFINE_SSE_FILLRECT(bpp, type) \
  static void \
  SDL_FillRect##bpp##SSE(Uint8 *pixels, int pitch, Uint32 color, int w, int h) \
  { \
      int i, n; \
      Uint8 *p = NULL; \
   \
      SSE_BEGIN; \
   \
      while (h--) { \
          n = w * bpp; \
          p = pixels; \
   \
          if (n > 63) { \
              int adjust = 16 - ((uintptr_t)p & 15); \
              if (adjust < 16) { \
                  n -= adjust; \
                  adjust /= bpp; \
                  while (adjust--) { \
                      *((type *)p) = (type)color; \
                      p += bpp; \
                  } \
              } \
              SSE_WORK; \
          } \
          if (n & 63) { \
              int remainder = (n & 63); \
              remainder /= bpp; \
              while (remainder--) { \
                  *((type *)p) = (type)color; \
                  p += bpp; \
              } \
          } \
          pixels += pitch; \
      } \
   \
      SSE_END; \
  }
  
  static void
  SDL_FillRect1SSE(Uint8 *pixels, int pitch, Uint32 color, int w, int h)
  {
      int i, n;
  
      SSE_BEGIN;
      while (h--) {
          Uint8 *p = pixels;
          n = w;
  
          if (n > 63) {
              int adjust = 16 - ((uintptr_t)p & 15);
              if (adjust) {
                  n -= adjust;
                  SDL_memset(p, color, adjust);
                  p += adjust;
              }
              SSE_WORK;
          }
          if (n & 63) {
              int remainder = (n & 63);
              SDL_memset(p, color, remainder);
          }
          pixels += pitch;
      }
  
      SSE_END;
  }
  /* DEFINE_SSE_FILLRECT(1, Uint8) */
  DEFINE_SSE_FILLRECT(2, Uint16)
  DEFINE_SSE_FILLRECT(4, Uint32)
  
  /* *INDENT-ON* */
  #endif /* __SSE__ */
  
  static void
  SDL_FillRect1(Uint8 * pixels, int pitch, Uint32 color, int w, int h)
  {
      int n;
      Uint8 *p = NULL;
      
      while (h--) {
          n = w;
          p = pixels;
  
          if (n > 3) {
              switch ((uintptr_t) p & 3) {
              case 1:
                  *p++ = (Uint8) color;
                  --n;                    SDL_FALLTHROUGH;
              case 2:
                  *p++ = (Uint8) color;
                  --n;                    SDL_FALLTHROUGH;
              case 3:
                  *p++ = (Uint8) color;
                  --n;
              }
              SDL_memset4(p, color, (n >> 2));
          }
          if (n & 3) {
              p += (n & ~3);
              switch (n & 3) {
              case 3:
                  *p++ = (Uint8) color;   SDL_FALLTHROUGH;
              case 2:
                  *p++ = (Uint8) color;   SDL_FALLTHROUGH;
              case 1:
                  *p++ = (Uint8) color;
              }
          }
          pixels += pitch;
      }
  }
  
  static void
  SDL_FillRect2(Uint8 * pixels, int pitch, Uint32 color, int w, int h)
  {
      int n;
      Uint16 *p = NULL;
      
      while (h--) {
          n = w;
          p = (Uint16 *) pixels;
  
          if (n > 1) {
              if ((uintptr_t) p & 2) {
                  *p++ = (Uint16) color;
                  --n;
              }
              SDL_memset4(p, color, (n >> 1));
          }
          if (n & 1) {
              p[n - 1] = (Uint16) color;
          }
          pixels += pitch;
      }
  }
  
  static void
  SDL_FillRect3(Uint8 * pixels, int pitch, Uint32 color, int w, int h)
  {
  #if SDL_BYTEORDER == SDL_LIL_ENDIAN
      Uint8 b1 = (Uint8) (color & 0xFF);
      Uint8 b2 = (Uint8) ((color >> 8) & 0xFF);
      Uint8 b3 = (Uint8) ((color >> 16) & 0xFF);
  #elif SDL_BYTEORDER == SDL_BIG_ENDIAN
      Uint8 b1 = (Uint8) ((color >> 16) & 0xFF);
      Uint8 b2 = (Uint8) ((color >> 8) & 0xFF);
      Uint8 b3 = (Uint8) (color & 0xFF);
  #endif
      int n;
      Uint8 *p = NULL;
  
      while (h--) {
          n = w;
          p = pixels;
  
          while (n--) {
              *p++ = b1;
              *p++ = b2;
              *p++ = b3;
          }
          pixels += pitch;
      }
  }
  
  static void
  SDL_FillRect4(Uint8 * pixels, int pitch, Uint32 color, int w, int h)
  {
      while (h--) {
          SDL_memset4(pixels, color, w);
          pixels += pitch;
      }
  }
  
  /* 
   * This function performs a fast fill of the given rectangle with 'color'
   */
  int
  SDL_FillRect(SDL_Surface * dst, const SDL_Rect * rect, Uint32 color)
  {
      if (!dst) {
          return SDL_SetError("Passed NULL destination surface");
      }
  
      /* If 'rect' == NULL, then fill the whole surface */
      if (!rect) {
          rect = &dst->clip_rect;
          /* Don't attempt to fill if the surface's clip_rect is empty */
          if (SDL_RectEmpty(rect)) {
              return 0;
          }
      }
  
      return SDL_FillRects(dst, rect, 1, color);
  }
  
  #if SDL_ARM_NEON_BLITTERS
  void FillRect8ARMNEONAsm(int32_t w, int32_t h, uint8_t *dst, int32_t dst_stride, uint8_t src);
  void FillRect16ARMNEONAsm(int32_t w, int32_t h, uint16_t *dst, int32_t dst_stride, uint16_t src);
  void FillRect32ARMNEONAsm(int32_t w, int32_t h, uint32_t *dst, int32_t dst_stride, uint32_t src);
  
  static void fill_8_neon(Uint8 * pixels, int pitch, Uint32 color, int w, int h) {
      FillRect8ARMNEONAsm(w, h, (uint8_t *) pixels, pitch >> 0, color);
      return;
  }
  
  static void fill_16_neon(Uint8 * pixels, int pitch, Uint32 color, int w, int h) {
      FillRect16ARMNEONAsm(w, h, (uint16_t *) pixels, pitch >> 1, color);
      return;
  }
  
  static void fill_32_neon(Uint8 * pixels, int pitch, Uint32 color, int w, int h) {
      FillRect32ARMNEONAsm(w, h, (uint32_t *) pixels, pitch >> 2, color);
      return;
  }
  #endif
  
  #if SDL_ARM_SIMD_BLITTERS
  void FillRect8ARMSIMDAsm(int32_t w, int32_t h, uint8_t *dst, int32_t dst_stride, uint8_t src);
  void FillRect16ARMSIMDAsm(int32_t w, int32_t h, uint16_t *dst, int32_t dst_stride, uint16_t src);
  void FillRect32ARMSIMDAsm(int32_t w, int32_t h, uint32_t *dst, int32_t dst_stride, uint32_t src);
  
  static void fill_8_simd(Uint8 * pixels, int pitch, Uint32 color, int w, int h) {
      FillRect8ARMSIMDAsm(w, h, (uint8_t *) pixels, pitch >> 0, color);
      return;
  }
  
  static void fill_16_simd(Uint8 * pixels, int pitch, Uint32 color, int w, int h) {
      FillRect16ARMSIMDAsm(w, h, (uint16_t *) pixels, pitch >> 1, color);
      return;
  }
  
  static void fill_32_simd(Uint8 * pixels, int pitch, Uint32 color, int w, int h) {
      FillRect32ARMSIMDAsm(w, h, (uint32_t *) pixels, pitch >> 2, color);
      return;
  }
  #endif
  
  int
  SDL_FillRects(SDL_Surface * dst, const SDL_Rect * rects, int count,
                Uint32 color)
  {
      SDL_Rect clipped;
      Uint8 *pixels;
      const SDL_Rect* rect;
      void (*fill_function)(Uint8 * pixels, int pitch, Uint32 color, int w, int h) = NULL;
      int i;
  
      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_FillRect(): Unsupported surface format");
      }
  
      /* Nothing to do */
      if (dst->w == 0 || dst->h == 0) {
          return 0;
      }
  
      /* Perform software fill */
      if (!dst->pixels) {
          return SDL_SetError("SDL_FillRect(): You must lock the surface");
      }
  
      if (!rects) {
          return SDL_SetError("SDL_FillRects() passed NULL rects");
      }
  
  #if SDL_ARM_NEON_BLITTERS
      if (SDL_HasNEON() && dst->format->BytesPerPixel != 3 && fill_function == NULL) {
          switch (dst->format->BytesPerPixel) {
          case 1:
              fill_function = fill_8_neon;
              break;
          case 2:
              fill_function = fill_16_neon;
              break;
          case 4:
              fill_function = fill_32_neon;
              break;
          }
      }
  #endif
  #if SDL_ARM_SIMD_BLITTERS
      if (SDL_HasARMSIMD() && dst->format->BytesPerPixel != 3 && fill_function == NULL) {
          switch (dst->format->BytesPerPixel) {
          case 1:
              fill_function = fill_8_simd;
              break;
          case 2:
              fill_function = fill_16_simd;
              break;
          case 4:
              fill_function = fill_32_simd;
              break;
          }
      }
  #endif
  
      if (fill_function == NULL) {
          switch (dst->format->BytesPerPixel) {
          case 1:
              {
                  color |= (color << 8);
                  color |= (color << 16);
  #ifdef __SSE__
                  if (SDL_HasSSE()) {
                      fill_function = SDL_FillRect1SSE;
                      break;
                  }
  #endif
                  fill_function = SDL_FillRect1;
                  break;
              }
  
          case 2:
              {
                  color |= (color << 16);
  #ifdef __SSE__
                  if (SDL_HasSSE()) {
                      fill_function = SDL_FillRect2SSE;
                      break;
                  }
  #endif
                  fill_function = SDL_FillRect2;
                  break;
              }
  
          case 3:
              /* 24-bit RGB is a slow path, at least for now. */
              {
                  fill_function = SDL_FillRect3;
                  break;
              }
  
          case 4:
              {
  #ifdef __SSE__
                  if (SDL_HasSSE()) {
                      fill_function = SDL_FillRect4SSE;
                      break;
                  }
  #endif
                  fill_function = SDL_FillRect4;
                  break;
              }
  
          default:
              return SDL_SetError("Unsupported pixel format");
          }
      }
  
      for (i = 0; i < count; ++i) {
          rect = &rects[i];
          /* Perform clipping */
          if (!SDL_IntersectRect(rect, &dst->clip_rect, &clipped)) {
              continue;
          }
          rect = &clipped;
  
          pixels = (Uint8 *) dst->pixels + rect->y * dst->pitch +
                                           rect->x * dst->format->BytesPerPixel;
  
          fill_function(pixels, dst->pitch, color, rect->w, rect->h);
      }
  
      /* We're done! */
      return 0;
  }
  
  /* vi: set ts=4 sw=4 expandtab: */
  

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