Commit e7e63a2d authored by gbazin's avatar gbazin
Browse files

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

parent 1909f528
......@@ -49,6 +49,8 @@ static void BlendR16( filter_t *, picture_t *, picture_t *, picture_t *,
int, int );
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 *,
int, int );
......@@ -74,6 +76,7 @@ static int OpenFilter( vlc_object_t *p_this )
if( ( p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','U','V','A') &&
p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','U','V','P') ) ||
( p_filter->fmt_out.video.i_chroma != VLC_FOURCC('I','4','2','0') &&
p_filter->fmt_out.video.i_chroma != VLC_FOURCC('Y','U','Y','2') &&
p_filter->fmt_out.video.i_chroma != VLC_FOURCC('Y','V','1','2') &&
p_filter->fmt_out.video.i_chroma != VLC_FOURCC('R','V','1','6') &&
p_filter->fmt_out.video.i_chroma != VLC_FOURCC('R','V','2','4') &&
......@@ -118,6 +121,13 @@ static void Blend( filter_t *p_filter, picture_t *p_dst,
i_x_offset, i_y_offset );
return;
}
if( p_filter->fmt_in.video.i_chroma == VLC_FOURCC('Y','U','V','A') &&
p_filter->fmt_out.video.i_chroma == VLC_FOURCC('Y','U','Y','2') )
{
BlendYUY2( 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','A') &&
p_filter->fmt_out.video.i_chroma == VLC_FOURCC('R','V','1','6') )
{
......@@ -474,6 +484,100 @@ static void BlendR24( filter_t *p_filter, picture_t *p_dst_pic,
return;
}
static void BlendYUY2( 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_dst, *p_src1, *p_src2_y;
uint8_t *p_src2_u, *p_src2_v;
uint8_t *p_trans;
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_x_offset * i_pix_pitch +
p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
p_dst_pic->p->i_pitch *
( i_y_offset + p_filter->fmt_out.video.i_y_offset );
i_src1_pitch = p_dst_orig->p[Y_PLANE].i_pitch;
p_src1 = p_dst_orig->p->p_pixels + i_x_offset * i_pix_pitch +
p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
p_dst_orig->p->i_pitch *
( i_y_offset + p_filter->fmt_out.video.i_y_offset );
i_src2_pitch = p_src->p[Y_PLANE].i_pitch;
p_src2_y = p_src->p[Y_PLANE].p_pixels +
p_filter->fmt_in.video.i_x_offset +
p_src->p[Y_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
p_src2_u = p_src->p[U_PLANE].p_pixels +
p_filter->fmt_in.video.i_x_offset/2 +
p_src->p[U_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
p_src2_v = p_src->p[V_PLANE].p_pixels +
p_filter->fmt_in.video.i_x_offset/2 +
p_src->p[V_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
p_trans = p_src->p[A_PLANE].p_pixels +
p_filter->fmt_in.video.i_x_offset +
p_src->p[A_PLANE].i_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
/* Draw until we reach the bottom of the subtitle */
for( i_y = 0; i_y < i_height; i_y++, p_trans += i_src2_pitch,
p_dst += i_dst_pitch, p_src1 += i_src1_pitch,
p_src2_y += i_src2_pitch, p_src2_u += i_src2_pitch,
p_src2_v += 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_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;
}
/* Blending */
p_dst[i_x * 2] = ( (uint16_t)p_src2_y[i_x] * p_trans[i_x] +
(uint16_t)p_src1[i_x * 2] *
(MAX_TRANS - p_trans[i_x]) ) >> TRANS_BITS;
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] +
(uint16_t)p_src1[i_x * 2 + 3] *
(MAX_TRANS - p_trans[i_x+1]) ) >> TRANS_BITS;
}
}
#undef MAX_TRANS
#undef TRANS_BITS
return;
}
static void BlendPalette( 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 )
......
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