Merge pull request #2473 from Starbuck5/smoothscale-intrinsics

Add SSE2 intrinsics smoothscale backend

Author: Starbuck5

src_c/simd_transform.h

@@ -9,6 +9,21 @@
 
 // SSE2 functions
 #if defined(__SSE2__) || defined(PG_ENABLE_ARM_NEON)
+
+// smoothscale filters
+void
+filter_shrink_X_SSE2(Uint8 *srcpix, Uint8 *dstpix, int height, int srcpitch,
+                     int dstpitch, int srcwidth, int dstwidth);
+void
+filter_shrink_Y_SSE2(Uint8 *srcpix, Uint8 *dstpix, int width, int srcpitch,
+                     int dstpitch, int srcheight, int dstheight);
+void
+filter_expand_X_SSE2(Uint8 *srcpix, Uint8 *dstpix, int height, int srcpitch,
+                     int dstpitch, int srcwidth, int dstwidth);
+void
+filter_expand_Y_SSE2(Uint8 *srcpix, Uint8 *dstpix, int width, int srcpitch,
+                     int dstpitch, int srcheight, int dstheight);
+
 #endif /* (defined(__SSE2__) || defined(PG_ENABLE_ARM_NEON)) */
 
 // AVX2 functions