video: remove slice based filtering and video output

Slices allowed filtering or drawing video in horizontal bands or
blocks. This allowed working on the video in smaller units. In theory,
this could bring a performance win by lowering cache pressure, as you
didn't have to keep the whole video frame in cache while filtering,
only the slice.

In practice, the slice code path was barely used for the following
reasons:
- Multithreaded decoding with ffmpeg didn't use slices. The ffmpeg
  slice callback was disabled, because it can be called from another
  thread, and the mplayer video chain is not thread-safe.
- There was nothing that would turn "full" images into appropriate
  slices, so slices were rarely used.
- Most filters didn't actually support slices.

On the other hand, supporting slices lead to code duplication and more
complex code in general. I made some experiments and didn't find any
actual measurable performance improvements when using slices. Even
ffmpeg removed slices based filtering from libavfilter in favor of
simpler code.

The most broken thing about the slices code path is that slices can't
be queued, like it is done for images in vo.c.

33 files changed, 23 insertions, 499 deletions

diff --git a/DOCS/man/en/options.rst b/DOCS/man/en/options.rst
index 271978786d..5265968269 100644
--- a/DOCS/man/en/options.rst
+++ b/DOCS/man/en/options.rst
@@ -937,7 +937,7 @@
         :8:      macroblock (MB) type
         :16:     per-block quantization parameter (QP)
         :32:     motion vector
-        :0x0040: motion vector visualization (use ``--no-slices``)
+        :0x0040: motion vector visualization
         :0x0080: macroblock (MB) skip
         :0x0100: startcode
         :0x0200: PTS
@@ -1759,12 +1759,6 @@
 
     This affects smplayer, smplayer2, mplayerosx, and others.
 
---slices, --no-slices
-    Drawing video by 16-pixel height slices/bands, instead draws the
-    whole frame in a single run. May be faster or slower, depending on video
-    card and available cache. It has effect only with libavcodec codecs.
-    Enabled by default if applicable; usually disabled when threading is used.
-
 --softsleep
     Time frames by repeatedly checking the current time instead of asking
     the kernel to wake up mpv at the correct time. Useful if your kernel
diff --git a/core/cfg-mplayer.h b/core/cfg-mplayer.h
index cbe705ebc4..a13eae243f 100644
--- a/core/cfg-mplayer.h
+++ b/core/cfg-mplayer.h
@@ -482,8 +482,6 @@ const m_option_t common_opts[] = {
 
     OPT_FLAG_CONSTANTS("flip", flip, 0, -1, 1),
 
-    // draw by slices or whole frame (useful with libmpeg2/libavcodec)
-    OPT_MAKE_FLAGS("slices", vd_use_slices, 0),
     // use (probably completely broken) decoder direct rendering
     OPT_MAKE_FLAGS("dr1", vd_use_dr1, 0),
     {"field-dominance", &field_dominance, CONF_TYPE_CHOICE, 0,
diff --git a/core/options.h b/core/options.h
index fbeb94c042..d6bac625df 100644
--- a/core/options.h
+++ b/core/options.h
@@ -108,7 +108,6 @@ typedef struct MPOpts {
     float movie_aspect;
     float screen_size_xy;
     int flip;
-    int vd_use_slices;
     int vd_use_dr1;
     char **sub_name;
     char **sub_paths;
diff --git a/video/decode/vd.c b/video/decode/vd.c
index 6112c48d33..89783da189 100644
--- a/video/decode/vd.c
+++ b/video/decode/vd.c
@@ -261,12 +261,3 @@ mp_image_t *mpcodecs_get_image(sh_video_t *sh, int mp_imgtype, int mp_imgflag,
 {
     return vf_get_image(sh->vfilter, sh->outfmt, mp_imgtype, mp_imgflag, w, h);
 }
-
-void mpcodecs_draw_slice(sh_video_t *sh, unsigned char **src, int *stride,
-                         int w, int h, int x, int y)
-{
-    struct vf_instance *vf = sh->vfilter;
-
-    if (vf->draw_slice)
-        vf->draw_slice(vf, src, stride, w, h, x, y);
-}
diff --git a/video/decode/vd.h b/video/decode/vd.h
index 2495a22dc3..838e5ad123 100644
--- a/video/decode/vd.h
+++ b/video/decode/vd.h
@@ -54,7 +54,5 @@ int mpcodecs_config_vo(sh_video_t *sh, int w, int h,
 
 mp_image_t *mpcodecs_get_image(sh_video_t *sh, int mp_imgtype, int mp_imgflag,
                                int w, int h);
-void mpcodecs_draw_slice(sh_video_t *sh, unsigned char **src, int *stride,
-                         int w, int h, int x, int y);
 
 #endif /* MPLAYER_VD_H */
diff --git a/video/decode/vd_lavc.c b/video/decode/vd_lavc.c
index 4d548c0fa0..2f661dfdd1 100644
--- a/video/decode/vd_lavc.c
+++ b/video/decode/vd_lavc.c
@@ -66,7 +66,6 @@ typedef struct {
     AVCodecContext *avctx;
     AVFrame *pic;
     enum PixelFormat pix_fmt;
-    int do_slices;
     int do_dr1;
     int vo_initialized;
     int best_csp;
@@ -83,8 +82,6 @@ typedef struct {
 
 static int get_buffer(AVCodecContext *avctx, AVFrame *pic);
 static void release_buffer(AVCodecContext *avctx, AVFrame *pic);
-static void draw_slice(struct AVCodecContext *s, const AVFrame *src,
-                       int offset[4], int y, int type, int height);
 static void draw_slice_hwdec(struct AVCodecContext *s, const AVFrame *src,
                              int offset[4], int y, int type, int height);
 
@@ -169,11 +166,6 @@ static int init(sh_video_t *sh)
     if (!sh->codecname)
         sh->codecname = lavc_codec->name;
 
-    if (sh->opts->vd_use_slices
-            && (lavc_codec->capabilities & CODEC_CAP_DRAW_HORIZ_BAND)
-            && !do_vis_debug)
-        ctx->do_slices = 1;
-
     if (lavc_codec->capabilities & CODEC_CAP_DR1 && !do_vis_debug
             && lavc_codec->id != CODEC_ID_H264
             && lavc_codec->id != CODEC_ID_INTERPLAY_VIDEO
@@ -192,7 +184,6 @@ static int init(sh_video_t *sh)
     if (lavc_codec->capabilities & CODEC_CAP_HWACCEL   // XvMC
         || lavc_codec->capabilities & CODEC_CAP_HWACCEL_VDPAU) {
         ctx->do_dr1    = true;
-        ctx->do_slices = true;
         lavc_param->threads    = 1;
         avctx->get_format      = get_format;
         avctx->get_buffer      = get_buffer;
@@ -219,7 +210,6 @@ static int init(sh_video_t *sh)
      * from other threads. */
     if (lavc_param->threads > 1) {
         ctx->do_dr1 = false;
-        ctx->do_slices = false;
         mp_tmsg(MSGT_DECVIDEO, MSGL_V, "Asking decoder to use "
                 "%d threads if supported.\n", lavc_param->threads);
     }
@@ -384,34 +374,6 @@ static void draw_slice_hwdec(struct AVCodecContext *s,
     vf->control(vf, VFCTRL_HWDEC_DECODER_RENDER, state_ptr);
 }
 
-static void draw_slice(struct AVCodecContext *s,
-                       const AVFrame *src, int offset[4],
-                       int y, int type, int height)
-{
-    sh_video_t *sh = s->opaque;
-    uint8_t *source[MP_MAX_PLANES] = {
-        src->data[0] + offset[0], src->data[1] + offset[1],
-        src->data[2] + offset[2]
-    };
-    int strides[MP_MAX_PLANES] = {
-        src->linesize[0], src->linesize[1], src->linesize[2]
-    };
-    if (height < 0) {
-        int i;
-        height = -height;
-        y -= height;
-        for (i = 0; i < MP_MAX_PLANES; i++) {
-            strides[i] = -strides[i];
-            source[i] -= strides[i];
-        }
-    }
-    if (y < sh->disp_h) {
-        height = FFMIN(height, sh->disp_h - y);
-        mpcodecs_draw_slice(sh, source, strides, sh->disp_w, height, 0, y);
-    }
-}
-
-
 static int init_vo(sh_video_t *sh, enum PixelFormat pix_fmt)
 {
     vd_ffmpeg_ctx *ctx = sh->context;
@@ -498,17 +460,14 @@ static int get_buffer(AVCodecContext *avctx, AVFrame *pic)
             type = MP_IMGTYPE_STATIC;
             flags |= MP_IMGFLAG_PRESERVE;
         }
-        flags |= ctx->do_slices ? MP_IMGFLAG_DRAW_CALLBACK : 0;
         mp_msg(MSGT_DECVIDEO, MSGL_DBG2,
                type == MP_IMGTYPE_STATIC ? "using STATIC\n" : "using TEMP\n");
     } else {
         if (!pic->reference) {
             ctx->b_count++;
-            flags |= ctx->do_slices ? MP_IMGFLAG_DRAW_CALLBACK : 0;
         } else {
             ctx->ip_count++;
-            flags |= MP_IMGFLAG_PRESERVE | MP_IMGFLAG_READABLE
-                     | (ctx->do_slices ? MP_IMGFLAG_DRAW_CALLBACK : 0);
+            flags |= MP_IMGFLAG_PRESERVE | MP_IMGFLAG_READABLE;
         }
     }
 
@@ -549,16 +508,6 @@ static int get_buffer(AVCodecContext *avctx, AVFrame *pic)
     if (!mpi)
         return -1;
 
-    // ok, let's see what did we get:
-    if (mpi->flags & MP_IMGFLAG_DRAW_CALLBACK &&
-        !(mpi->flags & MP_IMGFLAG_DIRECT)) {
-        // nice, filter/vo likes draw_callback :)
-        avctx->draw_horiz_band = draw_slice;
-    } else
-        avctx->draw_horiz_band = NULL;
-    if (IMGFMT_IS_HWACCEL(mpi->imgfmt))
-        avctx->draw_horiz_band = draw_slice_hwdec;
-
     pic->data[0] = mpi->planes[0];
     pic->data[1] = mpi->planes[1];
     pic->data[2] = mpi->planes[2];
diff --git a/video/filter/vf.c b/video/filter/vf.c
index ce842868ef..417d5be1a3 100644
--- a/video/filter/vf.c
+++ b/video/filter/vf.c
@@ -260,11 +260,9 @@ mp_image_t *vf_get_image(vf_instance_t *vf, unsigned int outfmt,
         // keep buffer allocation status & color flags only:
         mpi->flags &= MP_IMGFLAG_ALLOCATED | MP_IMGFLAG_TYPE_DISPLAYED |
                       MP_IMGFLAGMASK_COLORS;
-        // accept restrictions, draw_slice and palette flags only:
+        // accept restrictions, palette flags only:
         mpi->flags |= mp_imgflag & (MP_IMGFLAGMASK_RESTRICTIONS |
-                          MP_IMGFLAG_DRAW_CALLBACK | MP_IMGFLAG_RGB_PALETTE);
-        if (!vf->draw_slice)
-            mpi->flags &= ~MP_IMGFLAG_DRAW_CALLBACK;
+                                    MP_IMGFLAG_RGB_PALETTE);
         if (mpi->width != w2 || mpi->height != h || missing_palette) {
             if (mpi->flags & MP_IMGFLAG_ALLOCATED) {
                 if (mpi->width < w2 || mpi->height < h || missing_palette) {
@@ -331,17 +329,13 @@ mp_image_t *vf_get_image(vf_instance_t *vf, unsigned int outfmt,
                 vf_mpi_clear(mpi, 0, 0, mpi->width, mpi->height);
             }
         }
-        if (mpi->flags & MP_IMGFLAG_DRAW_CALLBACK)
-            if (vf->start_slice)
-                vf->start_slice(vf, mpi);
         if (!(mpi->flags & MP_IMGFLAG_TYPE_DISPLAYED)) {
             mp_msg(MSGT_DECVIDEO, MSGL_V,
-                   "*** [%s] %s%s mp_image_t, %dx%dx%dbpp %s %s, %d bytes\n",
+                   "*** [%s] %s mp_image_t, %dx%dx%dbpp %s %s, %d bytes\n",
                    vf->info->name,
                    (mpi->type == MP_IMGTYPE_EXPORT) ? "Exporting" :
                    ((mpi->flags & MP_IMGFLAG_DIRECT) ?
                             "Direct Rendering" : "Allocating"),
-                   (mpi->flags & MP_IMGFLAG_DRAW_CALLBACK) ? " (slices)" : "",
                    mpi->width, mpi->height, mpi->bpp,
                    (mpi->flags & MP_IMGFLAG_YUV) ? "YUV" :
                            ((mpi->flags & MP_IMGFLAG_SWAPPED) ? "BGR" : "RGB"),
@@ -664,39 +658,6 @@ int vf_next_put_image(struct vf_instance *vf, mp_image_t *mpi, double pts)
     return vf->next->put_image(vf->next, mpi, pts);
 }
 
-void vf_next_draw_slice(struct vf_instance *vf, unsigned char **src,
-                        int *stride, int w, int h, int x, int y)
-{
-    if (vf->next->draw_slice) {
-        vf->next->draw_slice(vf->next, src, stride, w, h, x, y);
-        return;
-    }
-    if (!vf->dmpi) {
-        mp_msg(MSGT_VFILTER, MSGL_ERR,
-               "draw_slice: dmpi not stored by vf_%s\n", vf->info->name);
-        return;
-    }
-    if (!(vf->dmpi->flags & MP_IMGFLAG_PLANAR)) {
-        memcpy_pic(vf->dmpi->planes[0] + y * vf->dmpi->stride[0] +
-                       vf->dmpi->bpp / 8 * x,
-                   src[0], vf->dmpi->bpp / 8 * w, h, vf->dmpi->stride[0],
-                   stride[0]);
-        return;
-    }
-    memcpy_pic(vf->dmpi->planes[0] + y * vf->dmpi->stride[0] + x, src[0],
-               w, h, vf->dmpi->stride[0], stride[0]);
-    memcpy_pic(vf->dmpi->planes[1]
-                   + (y >> vf->dmpi->chroma_y_shift) * vf->dmpi->stride[1]
-                   + (x >> vf->dmpi->chroma_x_shift),
-               src[1], w >> vf->dmpi->chroma_x_shift,
-               h >> vf->dmpi->chroma_y_shift, vf->dmpi->stride[1], stride[1]);
-    memcpy_pic(vf->dmpi->planes[2]
-                   + (y >> vf->dmpi->chroma_y_shift) * vf->dmpi->stride[2]
-                   + (x >> vf->dmpi->chroma_x_shift),
-               src[2], w >> vf->dmpi->chroma_x_shift,
-               h >> vf->dmpi->chroma_y_shift, vf->dmpi->stride[2], stride[2]);
-}
-
 //============================================================================
 
 vf_instance_t *append_filters(vf_instance_t *last,
diff --git a/video/filter/vf.h b/video/filter/vf.h
index f470bdc3b9..29727259ba 100644
--- a/video/filter/vf.h
+++ b/video/filter/vf.h
@@ -66,9 +66,6 @@ typedef struct vf_instance {
     int (*query_format)(struct vf_instance *vf, unsigned int fmt);
     void (*get_image)(struct vf_instance *vf, mp_image_t *mpi);
     int (*put_image)(struct vf_instance *vf, mp_image_t *mpi, double pts);
-    void (*start_slice)(struct vf_instance *vf, mp_image_t *mpi);
-    void (*draw_slice)(struct vf_instance *vf, unsigned char **src,
-                       int *stride, int w, int h, int x, int y);
     void (*uninit)(struct vf_instance *vf);
 
     int (*continue_buffered_image)(struct vf_instance *vf);
@@ -141,8 +138,6 @@ int vf_next_config(struct vf_instance *vf,
 int vf_next_control(struct vf_instance *vf, int request, void *data);
 int vf_next_query_format(struct vf_instance *vf, unsigned int fmt);
 int vf_next_put_image(struct vf_instance *vf, mp_image_t *mpi, double pts);
-void vf_next_draw_slice(struct vf_instance *vf, unsigned char **src,
-                        int *stride, int w, int h, int x, int y);
 
 struct m_obj_settings;
 vf_instance_t *append_filters(vf_instance_t *last,
diff --git a/video/filter/vf_crop.c b/video/filter/vf_crop.c
index 86eb1d2140..ed3457da70 100644
--- a/video/filter/vf_crop.c
+++ b/video/filter/vf_crop.c
@@ -86,8 +86,6 @@ static int config(struct vf_instance *vf,
 
 static int put_image(struct vf_instance *vf, mp_image_t *mpi, double pts){
     mp_image_t *dmpi;
-    if (mpi->flags&MP_IMGFLAG_DRAW_CALLBACK)
-	return vf_next_put_image(vf,vf->dmpi, pts);
     dmpi=vf_get_image(vf->next,mpi->imgfmt,
 	MP_IMGTYPE_EXPORT, 0,
 	vf->priv->crop_w, vf->priv->crop_h);
@@ -111,54 +109,11 @@ static int put_image(struct vf_instance *vf, mp_image_t *mpi, double pts){
     return vf_next_put_image(vf,dmpi, pts);
 }
 
-static void start_slice(struct vf_instance *vf, mp_image_t *mpi){
-    vf->dmpi = vf_get_image(vf->next, mpi->imgfmt, mpi->type, mpi->flags,
-	vf->priv->crop_w, vf->priv->crop_h);
-}
-
-static void draw_slice(struct vf_instance *vf,
-        unsigned char** src, int* stride, int w,int h, int x, int y){
-    unsigned char *src2[3];
-    src2[0] = src[0];
-    if (vf->dmpi->flags & MP_IMGFLAG_PLANAR) {
-	    src2[1] = src[1];
-	    src2[2] = src[2];
-    }
-    //mp_msg(MSGT_VFILTER, MSGL_V, "crop slice %d %d %d %d ->", w,h,x,y);
-    if ((x -= vf->priv->crop_x) < 0) {
-	x = -x;
-	src2[0] += x;
-	if (vf->dmpi->flags & MP_IMGFLAG_PLANAR) {
-		src2[1] += x>>vf->dmpi->chroma_x_shift;
-		src2[2] += x>>vf->dmpi->chroma_x_shift;
-	}
-	w -= x;
-	x = 0;
-    }
-    if ((y -= vf->priv->crop_y) < 0) {
-	y = -y;
-	src2[0] += y*stride[0];
-	if (vf->dmpi->flags & MP_IMGFLAG_PLANAR) {
-		src2[1] += (y>>vf->dmpi->chroma_y_shift)*stride[1];
-		src2[2] += (y>>vf->dmpi->chroma_y_shift)*stride[2];
-	}
-	h -= y;
-	y = 0;
-    }
-    if (x+w > vf->priv->crop_w) w = vf->priv->crop_w-x;
-    if (y+h > vf->priv->crop_h) h = vf->priv->crop_h-y;
-    //mp_msg(MSGT_VFILTER, MSGL_V, "%d %d %d %d\n", w,h,x,y);
-    if (w <= 0 || h <= 0) return;
-    vf_next_draw_slice(vf,src2,stride,w,h,x,y);
-}
-
 //===========================================================================//
 
 static int vf_open(vf_instance_t *vf, char *args){
     vf->config=config;
     vf->put_image=put_image;
-    vf->start_slice=start_slice;
-    vf->draw_slice=draw_slice;
     vf->default_reqs=VFCAP_ACCEPT_STRIDE;
     mp_msg(MSGT_VFILTER, MSGL_INFO, "Crop: %d x %d, %d ; %d\n",
     vf->priv->crop_w,
diff --git a/video/filter/vf_dsize.c b/video/filter/vf_dsize.c
index e1c246135b..7df9feb127 100644
--- a/video/filter/vf_dsize.c
+++ b/video/filter/vf_dsize.c
@@ -84,7 +84,6 @@ static void uninit(vf_instance_t *vf) {
 static int vf_open(vf_instance_t *vf, char *args)
 {
     vf->config = config;
-    vf->draw_slice = vf_next_draw_slice;
     vf->uninit = uninit;
     //vf->default_caps = 0;
     vf->priv = calloc(sizeof(struct vf_priv_s), 1);
diff --git a/video/filter/vf_expand.c b/video/filter/vf_expand.c
index 7c9feb4375..3d1e3467f4 100644
--- a/video/filter/vf_expand.c
+++ b/video/filter/vf_expand.c
@@ -48,7 +48,6 @@ static struct vf_priv_s {
     int exp_x,exp_y;
     double aspect;
     int round;
-    int first_slice;
 } const vf_priv_dflt = {
   -1,-1,
   -1,-1,
@@ -56,7 +55,6 @@ static struct vf_priv_s {
   -1,-1,
   0.,
   1,
-  0
 };
 
 //===========================================================================//
@@ -141,11 +139,6 @@ static void get_image(struct vf_instance *vf, mp_image_t *mpi){
 	    mpi->type, mpi->flags,
             FFMAX(vf->priv->exp_w, mpi->width +vf->priv->exp_x),
             FFMAX(vf->priv->exp_h, mpi->height+vf->priv->exp_y));
-	if((vf->dmpi->flags & MP_IMGFLAG_DRAW_CALLBACK) &&
-	  !(vf->dmpi->flags & MP_IMGFLAG_DIRECT)){
-	    mp_tmsg(MSGT_VFILTER, MSGL_INFO, "Full DR not possible, trying SLICES instead!\n");
-	    return;
-	}
 	// set up mpi as a cropped-down image of dmpi:
 	if(mpi->flags&MP_IMGFLAG_PLANAR){
 	    mpi->planes[0]=vf->dmpi->planes[0]+
@@ -164,73 +157,7 @@ static void get_image(struct vf_instance *vf, mp_image_t *mpi){
 	mpi->stride[0]=vf->dmpi->stride[0];
 	mpi->width=vf->dmpi->width;
 	mpi->flags|=MP_IMGFLAG_DIRECT;
-	mpi->flags&=~MP_IMGFLAG_DRAW_CALLBACK;
-//	vf->dmpi->flags&=~MP_IMGFLAG_DRAW_CALLBACK;
-    }
-}
-
-static void start_slice(struct vf_instance *vf, mp_image_t *mpi){
-//    printf("start_slice called! flag=%d\n",mpi->flags&MP_IMGFLAG_DRAW_CALLBACK);
-    // they want slices!!! allocate the buffer.
-    if(!mpi->priv)
-	mpi->priv=vf->dmpi=vf_get_image(vf->next,mpi->imgfmt,
-//	MP_IMGTYPE_TEMP, MP_IMGFLAG_ACCEPT_STRIDE | MP_IMGFLAG_PREFER_ALIGNED_STRIDE,
-	    MP_IMGTYPE_TEMP, mpi->flags,
-            FFMAX(vf->priv->exp_w, mpi->width +vf->priv->exp_x),
-            FFMAX(vf->priv->exp_h, mpi->height+vf->priv->exp_y));
-    vf->priv->first_slice = 1;
-}
-
-static void draw_top_blackbar_slice(struct vf_instance *vf,
-				    unsigned char** src, int* stride, int w,int h, int x, int y){
-    if(vf->priv->exp_y>0 && y == 0) {
-	vf_next_draw_slice(vf, vf->dmpi->planes, vf->dmpi->stride,
-			   vf->dmpi->w,vf->priv->exp_y,0,0);
-    }
-
-}
-
-static void draw_bottom_blackbar_slice(struct vf_instance *vf,
-				    unsigned char** src, int* stride, int w,int h, int x, int y){
-    if(vf->priv->exp_y+vf->h<vf->dmpi->h && y+h == vf->h) {
-	unsigned char *src2[MP_MAX_PLANES];
-	src2[0] = vf->dmpi->planes[0]
-		+ (vf->priv->exp_y+vf->h)*vf->dmpi->stride[0];
-	if(vf->dmpi->flags&MP_IMGFLAG_PLANAR){
-	    src2[1] = vf->dmpi->planes[1]
-		+ ((vf->priv->exp_y+vf->h)>>vf->dmpi->chroma_y_shift)*vf->dmpi->stride[1];
-	    src2[2] = vf->dmpi->planes[2]
-		+ ((vf->priv->exp_y+vf->h)>>vf->dmpi->chroma_y_shift)*vf->dmpi->stride[2];
-	} else {
-	    src2[1] = vf->dmpi->planes[1]; // passthrough rgb8 palette
-	}
-	vf_next_draw_slice(vf, src2, vf->dmpi->stride,
-			   vf->dmpi->w,vf->dmpi->h-(vf->priv->exp_y+vf->h),
-			   0,vf->priv->exp_y+vf->h);
-    }
-}
-
-static void draw_slice(struct vf_instance *vf,
-        unsigned char** src, int* stride, int w,int h, int x, int y){
-//    printf("draw_slice() called %d at %d\n",h,y);
-
-    if (y == 0 && y+h == vf->h) {
-	// special case - only one slice
-	draw_top_blackbar_slice(vf, src, stride, w, h, x, y);
-	vf_next_draw_slice(vf,src,stride,w,h,x+vf->priv->exp_x,y+vf->priv->exp_y);
-	draw_bottom_blackbar_slice(vf, src, stride, w, h, x, y);
-	return;
-    }
-    if (vf->priv->first_slice) {
-	draw_top_blackbar_slice(vf, src, stride, w, h, x, y);
-	draw_bottom_blackbar_slice(vf, src, stride, w, h, x, y);
-    }
-    vf_next_draw_slice(vf,src,stride,w,h,x+vf->priv->exp_x,y+vf->priv->exp_y);
-    if (!vf->priv->first_slice) {
-	draw_top_blackbar_slice(vf, src, stride, w, h, x, y);
-	draw_bottom_blackbar_slice(vf, src, stride, w, h, x, y);
     }
-    vf->priv->first_slice = 0;
 }
 
 // w, h = width and height of the actual video frame (located at exp_x/exp_y)
@@ -249,7 +176,7 @@ static void clear_borders(struct vf_instance *vf, int w, int h)
 }
 
 static int put_image(struct vf_instance *vf, mp_image_t *mpi, double pts){
-    if(mpi->flags&MP_IMGFLAG_DIRECT || mpi->flags&MP_IMGFLAG_DRAW_CALLBACK){
+    if(mpi->flags&MP_IMGFLAG_DIRECT){
 	vf->dmpi=mpi->priv;
 	if(!vf->dmpi) { mp_tmsg(MSGT_VFILTER, MSGL_WARN, "Why do we get NULL??\n"); return 0; }
 	mpi->priv=NULL;
@@ -304,8 +231,6 @@ static int vf_open(vf_instance_t *vf, char *args){
     vf->config=config;
     vf->control=control;
     vf->query_format=query_format;
-    vf->start_slice=start_slice;
-    vf->draw_slice=draw_slice;
     vf->get_image=get_image;
     vf->put_image=put_image;
     mp_msg(MSGT_VFILTER, MSGL_INFO, "Expand: %d x %d, %d ; %d, aspect: %f, round: %d\n",
diff --git a/video/filter/vf_format.c b/video/filter/vf_format.c
index ca71bb0548..7e0ab634c4 100644
--- a/video/filter/vf_format.c
+++ b/video/filter/vf_format.c
@@ -58,7 +58,6 @@ static int config(struct vf_instance *vf, int width, int height,
 
 static int vf_open(vf_instance_t *vf, char *args){
     vf->query_format=query_format;
-    vf->draw_slice=vf_next_draw_slice;
     vf->default_caps=0;
     if (vf->priv->outfmt)
         vf->config=config;
diff --git a/video/filter/vf_noformat.c b/video/filter/vf_noformat.c
index 0da691fec2..032d11fd57 100644
--- a/video/filter/vf_noformat.c
+++ b/video/filter/vf_noformat.c
@@ -47,7 +47,6 @@ static int query_format(struct vf_instance *vf, unsigned int fmt){
 
 static int vf_open(vf_instance_t *vf, char *args){
     vf->query_format=query_format;
-    vf->draw_slice=vf_next_draw_slice;
     vf->default_caps=0;
     return 1;
 }
diff --git a/video/filter/vf_pullup.c b/video/filter/vf_pullup.c
index c03d60341f..acac407429 100644
--- a/video/filter/vf_pullup.c
+++ b/video/filter/vf_pullup.c
@@ -99,7 +99,6 @@ static void get_image(struct vf_instance *vf, mp_image_t *mpi)
 	mpi->stride[2] = c->stride[2];
 
 	mpi->flags |= MP_IMGFLAG_DIRECT;
-	mpi->flags &= ~MP_IMGFLAG_DRAW_CALLBACK;
 }
 #endif
 
diff --git a/video/filter/vf_rotate.c b/video/filter/vf_rotate.c
index a59ddbc310..8994cf4588 100644
--- a/video/filter/vf_rotate.c
+++ b/video/filter/vf_rotate.c
@@ -76,7 +76,6 @@ static int config(struct vf_instance *vf,
     }
     if (vf->priv->direction & 4){
 	vf->put_image=vf_next_put_image; // passthru mode!
-	if (vf->next->draw_slice) vf->draw_slice=vf_next_draw_slice;
 /* FIXME: this should be in an other procedure in vf.c; that should always check
      whether the filter after the passthrough one still (not)supports slices */
 	return vf_next_config(vf,width,height,d_width,d_height,flags,outfmt);
diff --git a/video/filter/vf_scale.c b/video/filter/vf_scale.c
index 76423dbda9..5749aa0baf 100644
--- a/video/filter/vf_scale.c
+++ b/video/filter/vf_scale.c
@@ -47,7 +47,6 @@ static struct vf_priv_s {
     double param[2];
     unsigned int fmt;
     struct SwsContext *ctx;
-    struct SwsContext *ctx2; //for interlaced slices only
     unsigned char* palette;
     int interlaced;
     int noup;
@@ -60,7 +59,6 @@ static struct vf_priv_s {
   {SWS_PARAM_DEFAULT, SWS_PARAM_DEFAULT},
   0,
   NULL,
-  NULL,
   NULL
 };
 
@@ -301,7 +299,6 @@ static int config(struct vf_instance *vf,
 
     // free old ctx:
     if(vf->priv->ctx) sws_freeContext(vf->priv->ctx);
-    if(vf->priv->ctx2)sws_freeContext(vf->priv->ctx2);
 
     // new swscaler:
     sws_getFlagsAndFilterFromCmdLine(&int_sws_flags, &srcFilter, &dstFilter);
@@ -312,13 +309,6 @@ static int config(struct vf_instance *vf,
 		  vf->priv->w, vf->priv->h >> vf->priv->interlaced,
 	    dfmt,
 	    int_sws_flags, srcFilter, dstFilter, vf->priv->param);
-    if(vf->priv->interlaced){
-        vf->priv->ctx2=sws_getContext(width, height >> 1,
-	    sfmt,
-		  vf->priv->w, vf->priv->h >> 1,
-	    dfmt,
-	    int_sws_flags, srcFilter, dstFilter, vf->priv->param);
-    }
     if(!vf->priv->ctx){
 	// error...
 	mp_msg(MSGT_VFILTER,MSGL_WARN,"Couldn't init SwScaler for this setup\n");
@@ -388,16 +378,6 @@ static int config(struct vf_instance *vf,
     return vf_next_config(vf,vf->priv->w,vf->priv->h,d_width,d_height,flags,best);
 }
 
-static void start_slice(struct vf_instance *vf, mp_image_t *mpi){
-//    printf("start_slice called! flag=%d\n",mpi->flags&MP_IMGFLAG_DRAW_CALLBACK);
-    if(!(mpi->flags&MP_IMGFLAG_DRAW_CALLBACK)) return; // shouldn't happen
-    // they want slices!!! allocate the buffer.
-    mpi->priv=vf->dmpi=vf_get_image(vf->next,vf->priv->fmt,
-//	mpi->type, mpi->flags & (~MP_IMGFLAG_DRAW_CALLBACK),
-	MP_IMGTYPE_TEMP, MP_IMGFLAG_ACCEPT_STRIDE | MP_IMGFLAG_PREFER_ALIGNED_STRIDE,
-	vf->priv->w, vf->priv->h);
-}
-
 static void scale(struct SwsContext *sws1, struct SwsContext *sws2, uint8_t *src[MP_MAX_PLANES], int src_stride[MP_MAX_PLANES],
                   int y, int h,  uint8_t *dst[MP_MAX_PLANES], int dst_stride[MP_MAX_PLANES], int interlaced){
     const uint8_t *src2[MP_MAX_PLANES]={src[0], src[1], src[2], src[3]};
@@ -428,24 +408,13 @@ static void scale(struct SwsContext *sws1, struct SwsContext *sws2, uint8_t *src
     }
 }
 
-static void draw_slice(struct vf_instance *vf,
-        unsigned char** src, int* stride, int w,int h, int x, int y){
-    mp_image_t *dmpi=vf->dmpi;
-    if(!dmpi){
-	mp_msg(MSGT_VFILTER,MSGL_FATAL,"vf_scale: draw_slice() called with dmpi=NULL (no get_image?)\n");
-	return;
-    }
-//    printf("vf_scale::draw_slice() y=%d h=%d\n",y,h);
-    scale(vf->priv->ctx, vf->priv->ctx2, src, stride, y, h, dmpi->planes, dmpi->stride, vf->priv->interlaced);
-}
-
 static int put_image(struct vf_instance *vf, mp_image_t *mpi, double pts){
     mp_image_t *dmpi=mpi->priv;
 
 //    printf("vf_scale::put_image(): processing whole frame! dmpi=%p flag=%d\n",
 //	dmpi, (mpi->flags&MP_IMGFLAG_DRAW_CALLBACK));
 
-  if(!(mpi->flags&MP_IMGFLAG_DRAW_CALLBACK && dmpi)){
+  if(!dmpi){
 
     // hope we'll get DR buffer:
     dmpi=vf_get_image(vf->next,vf->priv->fmt,
@@ -512,17 +481,11 @@ static int control(struct vf_instance *vf, int request, void* data){
 
 	r= sws_setColorspaceDetails(vf->priv->ctx, inv_table, srcRange, table, dstRange, brightness, contrast, saturation);
 	if(r<0) break;
-	if(vf->priv->ctx2){
-            r= sws_setColorspaceDetails(vf->priv->ctx2, inv_table, srcRange, table, dstRange, brightness, contrast, saturation);
-            if(r<0) break;
-        }
 
 	return CONTROL_TRUE;
     case VFCTRL_SET_YUV_COLORSPACE: {
         struct mp_csp_details colorspace = *(struct mp_csp_details *)data;
         if (mp_sws_set_colorspace(vf->priv->ctx, &colorspace) >= 0) {
-            if (vf->priv->ctx2)
-