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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimp-gegl-loops-sse2.c
+ * Copyright (C) 2012 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <string.h>
+
+#include <cairo.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <gegl.h>
+
+#include "gimp-gegl-types.h"
+
+#include "gimp-gegl-loops-sse2.h"
+
+
+#if COMPILE_SSE2_INTRINISICS
+
+#include <emmintrin.h>
+
+
+/* helper function of gimp_gegl_smudge_with_paint_process_sse2()
+ * src and dest can be the same address
+ */
+static inline void
+gimp_gegl_smudge_with_paint_blend_sse2 (const gfloat *src1,
+ gfloat src1_rate,
+ const gfloat *src2,
+ gfloat src2_rate,
+ gfloat *dest,
+ gboolean no_erasing_src2)
+{
+ /* 2017/4/13 shark0r : According to my test, SSE decreases about 25%
+ * execution time
+ */
+
+ __m128 v_src1 = _mm_loadu_ps (src1);
+ __m128 v_src2 = _mm_loadu_ps (src2);
+ __m128 *v_dest = (__v4sf *) dest;
+
+ gfloat orginal_src2_alpha;
+ gfloat src1_alpha;
+ gfloat src2_alpha;
+ gfloat result_alpha;
+
+ orginal_src2_alpha = v_src2[3];
+ src1_alpha = src1_rate * v_src1[3];
+ src2_alpha = src2_rate * orginal_src2_alpha;
+ result_alpha = src1_alpha + src2_alpha;
+
+ if (result_alpha == 0)
+ {
+ *v_dest = _mm_set1_ps (0);
+ return;
+ }
+
+ *v_dest = (v_src1 * _mm_set1_ps (src1_alpha) +
+ v_src2 * _mm_set1_ps (src2_alpha)) /
+ _mm_set1_ps (result_alpha);
+
+ if (no_erasing_src2)
+ {
+ result_alpha = MAX (result_alpha, orginal_src2_alpha);
+ }
+
+ dest[3] = result_alpha;
+}
+
+/* helper function of gimp_gegl_smudge_with_paint()
+ *
+ * note that it's the caller's responsibility to verify that the buffers are
+ * properly aligned
+ */
+void
+gimp_gegl_smudge_with_paint_process_sse2 (gfloat *accum,
+ const gfloat *canvas,
+ gfloat *paint,
+ gint count,
+ const gfloat *brush_color,
+ gfloat brush_a,
+ gboolean no_erasing,
+ gfloat flow,
+ gfloat rate)
+{
+ while (count--)
+ {
+ /* blend accum_buffer and canvas_buffer to accum_buffer */
+ gimp_gegl_smudge_with_paint_blend_sse2 (accum, rate, canvas, 1 - rate,
+ accum, no_erasing);
+
+ /* blend accum_buffer and brush color/pixmap to paint_buffer */
+ if (brush_a == 0) /* pure smudge */
+ {
+ memcpy (paint, accum, sizeof (gfloat) * 4);
+ }
+ else
+ {
+ const gfloat *src1 = brush_color ? brush_color : paint;
+
+ gimp_gegl_smudge_with_paint_blend_sse2 (src1, flow, accum, 1 - flow,
+ paint, no_erasing);
+ }
+
+ accum += 4;
+ canvas += 4;
+ paint += 4;
+ }
+}
+
+#endif /* COMPILE_SSE2_INTRINISICS */