From 5a079a2d114f96d4847d1ee305d5b7c16eeec50e Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Sat, 27 Dec 2025 12:03:39 -0800
Subject: Initial commit

---
 contrib/SDL-3.2.8/src/video/SDL_blit_copy.c | 110 ++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 contrib/SDL-3.2.8/src/video/SDL_blit_copy.c

(limited to 'contrib/SDL-3.2.8/src/video/SDL_blit_copy.c')

diff --git a/contrib/SDL-3.2.8/src/video/SDL_blit_copy.c b/contrib/SDL-3.2.8/src/video/SDL_blit_copy.c
new file mode 100644
index 0000000..05ce0a4
--- /dev/null
+++ b/contrib/SDL-3.2.8/src/video/SDL_blit_copy.c
@@ -0,0 +1,110 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2025 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_surface_c.h"
+#include "SDL_blit_copy.h"
+
+#ifdef SDL_SSE_INTRINSICS
+// This assumes 16-byte aligned src and dst
+static SDL_INLINE void SDL_TARGETING("sse") SDL_memcpySSE(Uint8 *dst, const Uint8 *src, int len)
+{
+    int i;
+
+    __m128 values[4];
+    for (i = len / 64; i--;) {
+        _mm_prefetch((const char *)src, _MM_HINT_NTA);
+        values[0] = *(__m128 *)(src + 0);
+        values[1] = *(__m128 *)(src + 16);
+        values[2] = *(__m128 *)(src + 32);
+        values[3] = *(__m128 *)(src + 48);
+        _mm_stream_ps((float *)(dst + 0), values[0]);
+        _mm_stream_ps((float *)(dst + 16), values[1]);
+        _mm_stream_ps((float *)(dst + 32), values[2]);
+        _mm_stream_ps((float *)(dst + 48), values[3]);
+        src += 64;
+        dst += 64;
+    }
+
+    if (len & 63) {
+        SDL_memcpy(dst, src, len & 63);
+    }
+}
+#endif // SDL_SSE_INTRINSICS
+
+void SDL_BlitCopy(SDL_BlitInfo *info)
+{
+    bool overlap;
+    Uint8 *src, *dst;
+    int w, h;
+    int srcskip, dstskip;
+
+    w = info->dst_w * info->dst_fmt->bytes_per_pixel;
+    h = info->dst_h;
+    src = info->src;
+    dst = info->dst;
+    srcskip = info->src_pitch;
+    dstskip = info->dst_pitch;
+
+    // Properly handle overlapping blits
+    if (src < dst) {
+        overlap = (dst < (src + h * srcskip));
+    } else {
+        overlap = (src < (dst + h * dstskip));
+    }
+    if (overlap) {
+        if (dst < src) {
+            while (h--) {
+                SDL_memmove(dst, src, w);
+                src += srcskip;
+                dst += dstskip;
+            }
+        } else {
+            src += ((h - 1) * srcskip);
+            dst += ((h - 1) * dstskip);
+            while (h--) {
+                SDL_memmove(dst, src, w);
+                src -= srcskip;
+                dst -= dstskip;
+            }
+        }
+        return;
+    }
+
+#ifdef SDL_SSE_INTRINSICS
+    if (SDL_HasSSE() &&
+        !((uintptr_t)src & 15) && !(srcskip & 15) &&
+        !((uintptr_t)dst & 15) && !(dstskip & 15)) {
+        while (h--) {
+            SDL_memcpySSE(dst, src, w);
+            src += srcskip;
+            dst += dstskip;
+        }
+        return;
+    }
+#endif
+
+    while (h--) {
+        SDL_memcpy(dst, src, w);
+        src += srcskip;
+        dst += dstskip;
+    }
+}
-- 
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