Increase chrow row alignment to 16 bytes.

This is done by expanding luma row to 32-byte alignment, since
 there is currently a bunch of code that assumes that
 uv_stride == y_stride/2 (see, for example, vp8/common/postproc.c,
 common/reconinter.c, common/arm/neon/recon16x16mb_neon.asm,
 encoder/temporal_filter.c, and possibly others; I haven't done a
 full audit).
It also uses replaces the hardcoded border of 16 in a number of
 encoder buffers with VP8BORDERINPIXELS (currently 32), as the
 chroma rows start at an offset of border/2.
Together, these two changes have the nice advantage that simply
 dumping the frame memory as a contiguous blob produces a valid,
 if padded, image.

Change-Id: Iaf5ea722ae5c82d5daa50f6e2dade9de753f1003

1 files changed, 31 insertions, 14 deletions

diff --git a/vp8/vp8_dx_iface.c b/vp8/vp8_dx_iface.c
index 58dc486de..13a072bff 100644
--- a/vp8/vp8_dx_iface.c
+++ b/vp8/vp8_dx_iface.c
@@ -301,6 +301,36 @@ update_error_state(vpx_codec_alg_priv_t                 *ctx,
     return res;
 }
 
+static void yuvconfig2image(vpx_image_t               *img,
+                            const YV12_BUFFER_CONFIG  *yv12,
+                            void                      *user_priv)
+{
+    /** vpx_img_wrap() doesn't allow specifying independent strides for
+      * the Y, U, and V planes, nor other alignment adjustments that
+      * might be representable by a YV12_BUFFER_CONFIG, so we just
+      * initialize all the fields.*/
+    img->fmt = yv12->clrtype == REG_YUV ?
+        VPX_IMG_FMT_I420 : VPX_IMG_FMT_VPXI420;
+    img->w = yv12->y_stride;
+    img->h = (yv12->y_height + 2 * VP8BORDERINPIXELS + 15) & ~15;
+    img->d_w = yv12->y_width;
+    img->d_h = yv12->y_height;
+    img->x_chroma_shift = 1;
+    img->y_chroma_shift = 1;
+    img->planes[VPX_PLANE_Y] = yv12->y_buffer;
+    img->planes[VPX_PLANE_U] = yv12->u_buffer;
+    img->planes[VPX_PLANE_V] = yv12->v_buffer;
+    img->planes[VPX_PLANE_ALPHA] = NULL;
+    img->stride[VPX_PLANE_Y] = yv12->y_stride;
+    img->stride[VPX_PLANE_U] = yv12->uv_stride;
+    img->stride[VPX_PLANE_V] = yv12->uv_stride;
+    img->stride[VPX_PLANE_ALPHA] = yv12->y_stride;
+    img->bps = 12;
+    img->user_priv = user_priv;
+    img->img_data = yv12->buffer_alloc;
+    img->img_data_owner = 0;
+    img->self_allocd = 0;
+}
 
 static vpx_codec_err_t vp8_decode(vpx_codec_alg_priv_t  *ctx,
                                   const uint8_t         *data,
@@ -429,21 +459,8 @@ static vpx_codec_err_t vp8_decode(vpx_codec_alg_priv_t  *ctx,
 
         if (!res && 0 == vp8dx_get_raw_frame(ctx->pbi, &sd, &time_stamp, &time_end_stamp, &flags))
         {
-            /* Align width/height */
-            unsigned int a_w = (sd.y_width + 15) & ~15;
-            unsigned int a_h = (sd.y_height + 15) & ~15;
-
-            vpx_img_wrap(&ctx->img, VPX_IMG_FMT_I420,
-                         a_w + 2 * VP8BORDERINPIXELS,
-                         a_h + 2 * VP8BORDERINPIXELS,
-                         1,
-                         sd.buffer_alloc);
-            vpx_img_set_rect(&ctx->img,
-                             VP8BORDERINPIXELS, VP8BORDERINPIXELS,
-                             sd.y_width, sd.y_height);
-            ctx->img.user_priv = user_priv;
+            yuvconfig2image(&ctx->img, &sd, user_priv);
             ctx->img_avail = 1;
-
         }
     }