* modules/video_filter/blend.c: YUVP -> YUY2 alpha-blending.

modules/video_filter/blend.c

@@ -51,7 +51,9 @@ static void BlendR24( filter_t *, picture_t *, picture_t *, picture_t *,
                       int, int );
 static void BlendYUY2( filter_t *, picture_t *, picture_t *, picture_t *,
                        int, int );
-static void BlendPalette( filter_t *, picture_t *, picture_t *, picture_t *,
+static void BlendPalI420( filter_t *, picture_t *, picture_t *, picture_t *,
+                          int, int );
+static void BlendPalYUY2( filter_t *, picture_t *, picture_t *, picture_t *,
                           int, int );
 
 /*****************************************************************************
@@ -147,7 +149,14 @@ static void Blend( filter_t *p_filter, picture_t *p_dst,
         ( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('I','4','2','0') ||
           p_filter->fmt_out.video.i_chroma == VLC_FOURCC('Y','V','1','2') ) )
     {
-        BlendPalette( p_filter, p_dst, p_dst_orig, p_src,
+        BlendPalI420( p_filter, p_dst, p_dst_orig, p_src,
+                      i_x_offset, i_y_offset );
+        return;
+    }
+    if( p_filter->fmt_in.video.i_chroma == VLC_FOURCC('Y','U','V','P') &&
+        p_filter->fmt_out.video.i_chroma == VLC_FOURCC('Y','U','Y','2') )
+    {
+        BlendPalYUY2( p_filter, p_dst, p_dst_orig, p_src,
                       i_x_offset, i_y_offset );
         return;
     }
@@ -544,18 +553,16 @@ static void BlendYUY2( filter_t *p_filter, picture_t *p_dst_pic,
             if( !p_trans[i_x] )
             {
                 /* Completely transparent. Don't change pixel */
-                continue;
             }
             else if( p_trans[i_x] == MAX_TRANS )
             {
                 /* Completely opaque. Completely overwrite underlying pixel */
                 p_dst[i_x * 2]     = p_src2_y[i_x];
                 p_dst[i_x * 2 + 1] = p_src2_u[i_x];
-                p_dst[i_x * 2 + 2] = p_src2_y[i_x + 1];
-                p_dst[i_x * 2 + 3] = p_src2_v[i_x + 1];
-                continue;
+                p_dst[i_x * 2 + 3] = p_src2_v[i_x];
             }
-
+            else
+            {
                 /* Blending */
                 p_dst[i_x * 2]     = ( (uint16_t)p_src2_y[i_x] * p_trans[i_x] +
                     (uint16_t)p_src1[i_x * 2] *
@@ -563,14 +570,29 @@ static void BlendYUY2( filter_t *p_filter, picture_t *p_dst_pic,
                 p_dst[i_x * 2 + 1] = ( (uint16_t)p_src2_u[i_x] * p_trans[i_x] +
                     (uint16_t)p_src1[i_x * 2 + 1] *
                     (MAX_TRANS - p_trans[i_x]) ) >> TRANS_BITS;
-            p_dst[i_x * 2 + 2] = ( (uint16_t)p_src2_y[i_x+1] * p_trans[i_x+1] +
-                (uint16_t)p_src1[i_x * 2 + 2] *
-                (MAX_TRANS - p_trans[i_x+1]) ) >> TRANS_BITS;
-            p_dst[i_x * 2 + 3] = ( (uint16_t)p_src2_v[i_x+1] * p_trans[i_x+1] +
+                p_dst[i_x * 2 + 3] = ( (uint16_t)p_src2_v[i_x] * p_trans[i_x] +
                     (uint16_t)p_src1[i_x * 2 + 3] *
+                    (MAX_TRANS - p_trans[i_x]) ) >> TRANS_BITS;
+            }
+
+            if( !p_trans[i_x+1] )
+            {
+                /* Completely transparent. Don't change pixel */
+            }
+            else if( p_trans[i_x+1] == MAX_TRANS )
+            {
+                /* Completely opaque. Completely overwrite underlying pixel */
+                p_dst[i_x * 2 + 2] = p_src2_y[i_x + 1];
+            }
+            else
+            {
+                /* Blending */
+                p_dst[i_x * 2 + 2] = ( (uint16_t)p_src2_y[i_x+1] *
+                    p_trans[i_x+1] + (uint16_t)p_src1[i_x * 2 + 2] *
                     (MAX_TRANS - p_trans[i_x+1]) ) >> TRANS_BITS;
             }
         }
+    }
 
 #undef MAX_TRANS
 #undef TRANS_BITS
@@ -578,7 +600,7 @@ static void BlendYUY2( filter_t *p_filter, picture_t *p_dst_pic,
     return;
 }
 
-static void BlendPalette( filter_t *p_filter, picture_t *p_dst,
+static void BlendPalI420( filter_t *p_filter, picture_t *p_dst,
                           picture_t *p_dst_orig, picture_t *p_src,
                           int i_x_offset, int i_y_offset )
 {
@@ -690,6 +712,100 @@ static void BlendPalette( filter_t *p_filter, picture_t *p_dst,
     return;
 }
 
+static void BlendPalYUY2( filter_t *p_filter, picture_t *p_dst_pic,
+                          picture_t *p_dst_orig, picture_t *p_src,
+                          int i_x_offset, int i_y_offset )
+{
+    filter_sys_t *p_sys = p_filter->p_sys;
+    int i_src1_pitch, i_src2_pitch, i_dst_pitch;
+    uint8_t *p_src1, *p_src2, *p_dst;
+    int i_width, i_height, i_x, i_y, i_pix_pitch;
+
+    i_pix_pitch = 2;
+    i_dst_pitch = p_dst_pic->p->i_pitch;
+    p_dst = p_dst_pic->p->p_pixels + i_pix_pitch * (i_x_offset +
+            p_filter->fmt_out.video.i_x_offset) + p_dst_pic->p->i_pitch *
+            ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
+
+    i_src1_pitch = p_dst_orig->p->i_pitch;
+    p_src1 = p_dst_orig->p->p_pixels + i_pix_pitch * (i_x_offset +
+             p_filter->fmt_out.video.i_x_offset) + p_dst_orig->p->i_pitch *
+             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
+
+    i_src2_pitch = p_src->p->i_pitch;
+    p_src2 = p_src->p->p_pixels + p_filter->fmt_in.video.i_x_offset +
+             i_src2_pitch * p_filter->fmt_in.video.i_y_offset;
+
+    i_width = __MIN( p_filter->fmt_out.video.i_visible_width - i_x_offset,
+                     p_filter->fmt_in.video.i_visible_width );
+
+    i_height = __MIN( p_filter->fmt_out.video.i_visible_height - i_y_offset,
+                      p_filter->fmt_in.video.i_visible_height );
+
+#define MAX_TRANS 255
+#define TRANS_BITS  8
+#define p_trans p_src2
+#define p_pal p_filter->fmt_in.video.p_palette->palette
+
+    /* Draw until we reach the bottom of the subtitle */
+    for( i_y = 0; i_y < i_height; i_y++,
+         p_dst += i_dst_pitch, p_src1 += i_src1_pitch, p_src2 += i_src2_pitch )
+    {
+        /* Draw until we reach the end of the line */
+        for( i_x = 0; i_x < i_width; i_x += 2 )
+        {
+            if( !p_pal[p_trans[i_x]][3] )
+            {
+                /* Completely transparent. Don't change pixel */
+            }
+            else if( p_pal[p_trans[i_x]][3] == MAX_TRANS )
+            {
+                /* Completely opaque. Completely overwrite underlying pixel */
+                p_dst[i_x * 2]     = p_pal[p_src2[i_x]][0];
+                p_dst[i_x * 2 + 1] = p_pal[p_src2[i_x]][1];
+                p_dst[i_x * 2 + 3] = p_pal[p_src2[i_x]][2];
+            }
+            else
+            {
+                /* Blending */
+                p_dst[i_x * 2]     = ( (uint16_t)p_pal[p_src2[i_x]][0] *
+                    p_pal[p_trans[i_x]][3] + (uint16_t)p_src1[i_x * 2] *
+                    (MAX_TRANS - p_pal[p_trans[i_x]][3]) ) >> TRANS_BITS;
+                p_dst[i_x * 2 + 1] = ( (uint16_t)p_pal[p_src2[i_x]][1] *
+                    p_pal[p_trans[i_x]][3] + (uint16_t)p_src1[i_x * 2 + 1] *
+                    (MAX_TRANS - p_pal[p_trans[i_x]][3]) ) >> TRANS_BITS;
+                p_dst[i_x * 2 + 3] = ( (uint16_t)p_pal[p_src2[i_x]][2] *
+                    p_pal[p_trans[i_x]][3] + (uint16_t)p_src1[i_x * 2 + 3] *
+                    (MAX_TRANS - p_pal[p_trans[i_x]][3]) ) >> TRANS_BITS;
+            }
+
+            if( !p_pal[p_trans[i_x+1]][3] )
+            {
+                /* Completely transparent. Don't change pixel */
+            }
+            else if( p_pal[p_trans[i_x+1]][3] == MAX_TRANS )
+            {
+                /* Completely opaque. Completely overwrite underlying pixel */
+                p_dst[i_x * 2 + 2] = p_pal[p_src2[i_x + 1]][0];
+            }
+            else
+            {
+                /* Blending */
+                p_dst[i_x * 2 + 2] = ( (uint16_t)p_pal[p_src2[i_x+1]][0] *
+                    p_pal[p_trans[i_x+1]][3] + (uint16_t)p_src1[i_x * 2 + 2] *
+                    (MAX_TRANS - p_pal[p_trans[i_x+1]][3]) ) >> TRANS_BITS;
+            }
+        }
+    }
+
+#undef MAX_TRANS
+#undef TRANS_BITS
+#undef p_trans
+#undef p_pal
+
+    return;
+}
+
 /*****************************************************************************
  * CloseFilter: clean up the filter
  *****************************************************************************/