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-rw-r--r--media/libvpx/vp8/common/extend.c188
1 files changed, 188 insertions, 0 deletions
diff --git a/media/libvpx/vp8/common/extend.c b/media/libvpx/vp8/common/extend.c
new file mode 100644
index 000000000..2d938ad78
--- /dev/null
+++ b/media/libvpx/vp8/common/extend.c
@@ -0,0 +1,188 @@
+/*
+ * Copyright (c) 2010 The WebM project authors. All Rights Reserved.
+ *
+ * Use of this source code is governed by a BSD-style license
+ * that can be found in the LICENSE file in the root of the source
+ * tree. An additional intellectual property rights grant can be found
+ * in the file PATENTS. All contributing project authors may
+ * be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+#include "extend.h"
+#include "vpx_mem/vpx_mem.h"
+
+
+static void copy_and_extend_plane
+(
+ unsigned char *s, /* source */
+ int sp, /* source pitch */
+ unsigned char *d, /* destination */
+ int dp, /* destination pitch */
+ int h, /* height */
+ int w, /* width */
+ int et, /* extend top border */
+ int el, /* extend left border */
+ int eb, /* extend bottom border */
+ int er /* extend right border */
+)
+{
+ int i;
+ unsigned char *src_ptr1, *src_ptr2;
+ unsigned char *dest_ptr1, *dest_ptr2;
+ int linesize;
+
+ /* copy the left and right most columns out */
+ src_ptr1 = s;
+ src_ptr2 = s + w - 1;
+ dest_ptr1 = d - el;
+ dest_ptr2 = d + w;
+
+ for (i = 0; i < h; i++)
+ {
+ memset(dest_ptr1, src_ptr1[0], el);
+ memcpy(dest_ptr1 + el, src_ptr1, w);
+ memset(dest_ptr2, src_ptr2[0], er);
+ src_ptr1 += sp;
+ src_ptr2 += sp;
+ dest_ptr1 += dp;
+ dest_ptr2 += dp;
+ }
+
+ /* Now copy the top and bottom lines into each line of the respective
+ * borders
+ */
+ src_ptr1 = d - el;
+ src_ptr2 = d + dp * (h - 1) - el;
+ dest_ptr1 = d + dp * (-et) - el;
+ dest_ptr2 = d + dp * (h) - el;
+ linesize = el + er + w;
+
+ for (i = 0; i < et; i++)
+ {
+ memcpy(dest_ptr1, src_ptr1, linesize);
+ dest_ptr1 += dp;
+ }
+
+ for (i = 0; i < eb; i++)
+ {
+ memcpy(dest_ptr2, src_ptr2, linesize);
+ dest_ptr2 += dp;
+ }
+}
+
+
+void vp8_copy_and_extend_frame(YV12_BUFFER_CONFIG *src,
+ YV12_BUFFER_CONFIG *dst)
+{
+ int et = dst->border;
+ int el = dst->border;
+ int eb = dst->border + dst->y_height - src->y_height;
+ int er = dst->border + dst->y_width - src->y_width;
+
+ copy_and_extend_plane(src->y_buffer, src->y_stride,
+ dst->y_buffer, dst->y_stride,
+ src->y_height, src->y_width,
+ et, el, eb, er);
+
+ et = dst->border >> 1;
+ el = dst->border >> 1;
+ eb = (dst->border >> 1) + dst->uv_height - src->uv_height;
+ er = (dst->border >> 1) + dst->uv_width - src->uv_width;
+
+ copy_and_extend_plane(src->u_buffer, src->uv_stride,
+ dst->u_buffer, dst->uv_stride,
+ src->uv_height, src->uv_width,
+ et, el, eb, er);
+
+ copy_and_extend_plane(src->v_buffer, src->uv_stride,
+ dst->v_buffer, dst->uv_stride,
+ src->uv_height, src->uv_width,
+ et, el, eb, er);
+}
+
+
+void vp8_copy_and_extend_frame_with_rect(YV12_BUFFER_CONFIG *src,
+ YV12_BUFFER_CONFIG *dst,
+ int srcy, int srcx,
+ int srch, int srcw)
+{
+ int et = dst->border;
+ int el = dst->border;
+ int eb = dst->border + dst->y_height - src->y_height;
+ int er = dst->border + dst->y_width - src->y_width;
+ int src_y_offset = srcy * src->y_stride + srcx;
+ int dst_y_offset = srcy * dst->y_stride + srcx;
+ int src_uv_offset = ((srcy * src->uv_stride) >> 1) + (srcx >> 1);
+ int dst_uv_offset = ((srcy * dst->uv_stride) >> 1) + (srcx >> 1);
+
+ /* If the side is not touching the bounder then don't extend. */
+ if (srcy)
+ et = 0;
+ if (srcx)
+ el = 0;
+ if (srcy + srch != src->y_height)
+ eb = 0;
+ if (srcx + srcw != src->y_width)
+ er = 0;
+
+ copy_and_extend_plane(src->y_buffer + src_y_offset,
+ src->y_stride,
+ dst->y_buffer + dst_y_offset,
+ dst->y_stride,
+ srch, srcw,
+ et, el, eb, er);
+
+ et = (et + 1) >> 1;
+ el = (el + 1) >> 1;
+ eb = (eb + 1) >> 1;
+ er = (er + 1) >> 1;
+ srch = (srch + 1) >> 1;
+ srcw = (srcw + 1) >> 1;
+
+ copy_and_extend_plane(src->u_buffer + src_uv_offset,
+ src->uv_stride,
+ dst->u_buffer + dst_uv_offset,
+ dst->uv_stride,
+ srch, srcw,
+ et, el, eb, er);
+
+ copy_and_extend_plane(src->v_buffer + src_uv_offset,
+ src->uv_stride,
+ dst->v_buffer + dst_uv_offset,
+ dst->uv_stride,
+ srch, srcw,
+ et, el, eb, er);
+}
+
+
+/* note the extension is only for the last row, for intra prediction purpose */
+void vp8_extend_mb_row(YV12_BUFFER_CONFIG *ybf,
+ unsigned char *YPtr,
+ unsigned char *UPtr,
+ unsigned char *VPtr)
+{
+ int i;
+
+ YPtr += ybf->y_stride * 14;
+ UPtr += ybf->uv_stride * 6;
+ VPtr += ybf->uv_stride * 6;
+
+ for (i = 0; i < 4; i++)
+ {
+ YPtr[i] = YPtr[-1];
+ UPtr[i] = UPtr[-1];
+ VPtr[i] = VPtr[-1];
+ }
+
+ YPtr += ybf->y_stride;
+ UPtr += ybf->uv_stride;
+ VPtr += ybf->uv_stride;
+
+ for (i = 0; i < 4; i++)
+ {
+ YPtr[i] = YPtr[-1];
+ UPtr[i] = UPtr[-1];
+ VPtr[i] = VPtr[-1];
+ }
+}