avfilter/vf_gblur: Move ff_gblur_init into a header

This removes a dependency of checkasm on lavfi/vf_gblur.o
and also allows to inline ff_gblur_init() irrespectively of
interposing.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

1 files changed, 122 insertions, 0 deletions

diff --git a/libavfilter/vf_gblur_init.h b/libavfilter/vf_gblur_init.h
new file mode 100644
index 0000000000..0fee64bc98
--- /dev/null
+++ b/libavfilter/vf_gblur_init.h
@@ -0,0 +1,122 @@
+/*
+ * Copyright (c) 2011 Pascal Getreuer
+ * Copyright (c) 2016 Paul B Mahol
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above
+ *    copyright notice, this list of conditions and the following
+ *    disclaimer in the documentation and/or other materials provided
+ *    with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef AVFILTER_GBLUR_INIT_H
+#define AVFILTER_GBLUR_INIT_H
+
+#include "config.h"
+#include "libavutil/attributes.h"
+#include "libavutil/common.h"
+#include "gblur.h"
+
+static void postscale_c(float *buffer, int length,
+                        float postscale, float min, float max)
+{
+    for (int i = 0; i < length; i++) {
+        buffer[i] *= postscale;
+        buffer[i] = av_clipf(buffer[i], min, max);
+    }
+}
+
+static void horiz_slice_c(float *buffer, int width, int height, int steps,
+                          float nu, float bscale, float *localbuf)
+{
+    int x;
+    for (int y = 0; y < height; y++) {
+        for (int step = 0; step < steps; step++) {
+            float *ptr = buffer + width * y;
+            ptr[0] *= bscale;
+
+            /* Filter rightwards */
+            for (x = 1; x < width; x++)
+                ptr[x] += nu * ptr[x - 1];
+            ptr[x = width - 1] *= bscale;
+
+            /* Filter leftwards */
+            for (; x > 0; x--)
+                ptr[x - 1] += nu * ptr[x];
+        }
+    }
+}
+
+static void do_vertical_columns(float *buffer, int width, int height,
+                                int column_begin, int column_end, int steps,
+                                float nu, float boundaryscale, int column_step)
+{
+    const int numpixels = width * height;
+    int i;
+    for (int x = column_begin; x < column_end;) {
+        for (int step = 0; step < steps; step++) {
+            float *ptr = buffer + x;
+            for (int k = 0; k < column_step; k++) {
+                ptr[k] *= boundaryscale;
+            }
+            /* Filter downwards */
+            for (i = width; i < numpixels; i += width) {
+                for (int k = 0; k < column_step; k++) {
+                    ptr[i + k] += nu * ptr[i - width + k];
+                }
+            }
+            i = numpixels - width;
+
+            for (int k = 0; k < column_step; k++)
+                ptr[i + k] *= boundaryscale;
+
+            /* Filter upwards */
+            for (; i > 0; i -= width) {
+                for (int k = 0; k < column_step; k++)
+                    ptr[i - width + k] += nu * ptr[i + k];
+            }
+        }
+        x += column_step;
+    }
+}
+
+static void verti_slice_c(float *buffer, int width, int height,
+                          int slice_start, int slice_end, int steps,
+                          float nu, float boundaryscale)
+{
+    int aligned_end = slice_start + (((slice_end - slice_start) >> 3) << 3);
+    /* Filter vertically along columns (process 8 columns in each step) */
+    do_vertical_columns(buffer, width, height, slice_start, aligned_end,
+                        steps, nu, boundaryscale, 8);
+    /* Filter un-aligned columns one by one */
+    do_vertical_columns(buffer, width, height, aligned_end, slice_end,
+                        steps, nu, boundaryscale, 1);
+}
+
+static av_unused void ff_gblur_init(GBlurContext *s)
+{
+    s->localbuf = NULL;
+    s->horiz_slice = horiz_slice_c;
+    s->verti_slice = verti_slice_c;
+    s->postscale_slice = postscale_c;
+    if (ARCH_X86)
+        ff_gblur_init_x86(s);
+}
+
+#endif /* AVFILTER_GBLUR_INIT_H */