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/*
* Copyright (C) 2006 Mindfruit Bv.
* Author: Sjoerd Simons <sjoerd@luon.net>
* Author: Alex Ugarte <alexugarte@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <gst/gst.h>
#include <string.h>
#include "videomixer.h"
#define BLEND_NORMAL(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
Y = ((Y1*(255-alpha))+(Y2*alpha))>>8; \
U = ((U1*(255-alpha))+(U2*alpha))>>8; \
V = ((V1*(255-alpha))+(V2*alpha))>>8;
#define BLEND_ADD(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
Y = Y1+((Y2*alpha)>>8); \
U = U1+(((127*(255-alpha)+(U2*alpha)))>>8)-127; \
V = V1+(((127*(255-alpha)+(V2*alpha)))>>8)-127; \
if (Y>255) { \
gint mult = MAX (0, 288-Y); \
U = ((U*mult) + (127*(32-mult)))>>5; \
V = ((V*mult) + (127*(32-mult)))>>5; \
Y = 255; \
} \
U = MIN (U,255); \
V = MIN (V,255);
#define BLEND_SUBTRACT(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
Y = Y1-((Y2*alpha)>>8); \
U = U1+(((127*(255-alpha)+(U2*alpha)))>>8)-127; \
V = V1+(((127*(255-alpha)+(V2*alpha)))>>8)-127; \
if (Y<0) { \
gint mult = MIN (32, -Y); \
U = ((U*(32-mult)) + (127*mult))>>5; \
V = ((V*(32-mult)) + (127*mult))>>5; \
Y = 0; \
}
#define BLEND_DARKEN(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
if (Y1 < Y2) { \
Y = Y1; U = U1; V = V1; \
} \
else { \
Y = ((Y1*(255-alpha))+(Y2*alpha))>>8; \
U = ((U1*(255-alpha))+(U2*alpha))>>8; \
V = ((V1*(255-alpha))+(V2*alpha))>>8; \
}
#define BLEND_LIGHTEN(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
if (Y1 > Y2) { \
Y = Y1; U = U1; V = V1; \
} \
else { \
Y = ((Y1*(255-alpha))+(Y2*alpha))>>8; \
U = ((U1*(255-alpha))+(U2*alpha))>>8; \
V = ((V1*(255-alpha))+(V2*alpha))>>8; \
}
#define BLEND_MULTIPLY(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
Y = (Y1*(256*(255-alpha) +(Y2*alpha)))>>16; \
U = ((U1*(255-alpha)*256)+(alpha*(U1*Y2+128*(256-Y2))))>>16; \
V = ((V1*(255-alpha)*256)+(alpha*(V1*Y2+128*(256-Y2))))>>16;
#define BLEND_DIFFERENCE(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
Y = ABS((gint)Y1-(gint)Y2)+127; \
U = ABS((gint)U1-(gint)U2)+127; \
V = ABS((gint)V1-(gint)V2)+127; \
Y = ((Y*alpha)+(Y1*(255-alpha)))>>8; \
U = ((U*alpha)+(U1*(255-alpha)))>>8; \
V = ((V*alpha)+(V1*(255-alpha)))>>8; \
if (Y>255) { \
gint mult = MAX (0, 288-Y); \
U = ((U*mult) + (127*(32-mult)))>>5; \
V = ((V*mult) + (127*(32-mult)))>>5; \
Y = 255; \
} else if (Y<0) { \
gint mult = MIN (32, -Y); \
U = ((U*(32-mult)) + (127*mult))>>5; \
V = ((V*(32-mult)) + (127*mult))>>5; \
Y = 0; \
} \
U = CLAMP(U, 0, 255); \
V = CLAMP(V, 0, 255);
#define BLEND_EXCLUSION(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
Y = ((gint)(Y1^0xff)*Y2+(gint)(Y2^0xff)*Y1)>>8; \
U = ((gint)(U1^0xff)*Y2+(gint)(Y2^0xff)*U1)>>8; \
V = ((gint)(V1^0xff)*Y2+(gint)(Y2^0xff)*V1)>>8; \
Y = ((Y*alpha)+(Y1*(255-alpha)))>>8; \
U = ((U*alpha)+(U1*(255-alpha)))>>8; \
V = ((V*alpha)+(V1*(255-alpha)))>>8; \
if (Y>255) { \
gint mult = MAX (0, 288-Y); \
U = ((U*mult) + (127*(32-mult)))>>5; \
V = ((V*mult) + (127*(32-mult)))>>5; \
Y = 255; \
} else if (Y<0) { \
gint mult = MIN (32, -Y); \
U = ((U*(32-mult)) + (127*mult))>>5; \
V = ((V*(32-mult)) + (127*mult))>>5; \
Y = 0; \
} \
U = CLAMP(U, 0, 255); \
V = CLAMP(V, 0, 255);
#define BLEND_SOFTLIGHT(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
Y = (gint)Y1+(gint)Y2 - 127; \
U = (gint)U1+(gint)U2 - 127; \
V = (gint)V1+(gint)V2 - 127; \
Y = ((Y*alpha)+(Y1*(255-alpha)))>>8; \
U = ((U*alpha)+(U1*(255-alpha)))>>8; \
V = ((V*alpha)+(V1*(255-alpha)))>>8; \
if (Y>255) { \
gint mult = MAX (0, 288-Y); \
U = ((U*mult) + (127*(32-mult)))>>5; \
V = ((V*mult) + (127*(32-mult)))>>5; \
Y = 255; \
} else if (Y<0) { \
gint mult = MIN (32, -Y); \
U = ((U*(32-mult)) + (127*mult))>>5; \
V = ((V*(32-mult)) + (127*mult))>>5; \
Y = 0; \
} \
#define BLEND_HARDLIGHT(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
Y = (gint)Y1+(gint)Y2*2 - 255; \
U = (gint)U1+(gint)U2 - 127; \
V = (gint)V1+(gint)V2 - 127; \
Y = ((Y*alpha)+(Y1*(255-alpha)))>>8; \
U = ((U*alpha)+(U1*(255-alpha)))>>8; \
V = ((V*alpha)+(V1*(255-alpha)))>>8; \
if (Y>255) { \
gint mult = MAX (0, 288-Y); \
U = ((U*mult) + (127*(32-mult)))>>5; \
V = ((V*mult) + (127*(32-mult)))>>5; \
Y = 255; \
} else if (Y<0) { \
gint mult = MIN (32, -Y); \
U = ((U*(32-mult)) + (127*mult))>>5; \
V = ((V*(32-mult)) + (127*mult))>>5; \
Y = 0; \
} \
#define BLEND_MODE BLEND_NORMAL
#if 0
#define BLEND_MODE BLEND_NORMAL
#define BLEND_MODE BLEND_ADD
#define BLEND_MODE BLEND_SUBTRACT
#define BLEND_MODE BLEND_LIGHTEN
#define BLEND_MODE BLEND_DARKEN
#define BLEND_MODE BLEND_MULTIPLY
#define BLEND_MODE BLEND_DIFFERENCE
#define BLEND_MODE BLEND_EXCLUSION
#define BLEND_MODE BLEND_SOFTLIGHT
#define BLEND_MODE BLEND_HARDLIGHT
#endif
/* I420 */
/* Copied from jpegenc */
#define VIDEO_Y_ROWSTRIDE(width) (GST_ROUND_UP_4(width))
#define VIDEO_U_ROWSTRIDE(width) (GST_ROUND_UP_8(width)/2)
#define VIDEO_V_ROWSTRIDE(width) ((GST_ROUND_UP_8(VIDEO_Y_ROWSTRIDE(width)))/2)
#define VIDEO_Y_OFFSET(w,h) (0)
#define VIDEO_U_OFFSET(w,h) (VIDEO_Y_OFFSET(w,h)+(VIDEO_Y_ROWSTRIDE(w)*GST_ROUND_UP_2(h)))
#define VIDEO_V_OFFSET(w,h) (VIDEO_U_OFFSET(w,h)+(VIDEO_U_ROWSTRIDE(w)*GST_ROUND_UP_2(h)/2))
#define VIDEO_SIZE(w,h) (VIDEO_V_OFFSET(w,h)+(VIDEO_V_ROWSTRIDE(w)*GST_ROUND_UP_2(h)/2))
inline static void
gst_i420_do_blend (guint8 * src, guint8 * dest,
gint src_stride, gint dest_stride, gint src_width, gint src_height,
gint dest_width, gdouble src_alpha)
{
int i, j;
gint b_alpha;
/* If it's completely transparent... we just return */
if (G_UNLIKELY (src_alpha == 0.0)) {
GST_INFO ("Fast copy (alpha == 0.0)");
return;
}
/* If it's completely opaque, we do a fast copy */
if (G_UNLIKELY (src_alpha == 1.0)) {
GST_INFO ("Fast copy (alpha == 1.0)");
for (i = 0; i < src_height; i++) {
memcpy (dest, src, src_width);
src += src_stride;
dest += dest_stride;
}
return;
}
b_alpha = (gint) (src_alpha * 255);
for (i = 0; i < src_height; i++) {
for (j = 0; j < src_width; j++) {
*dest = (b_alpha * (*src) + (255 - b_alpha) * (*dest)) >> 8;
dest++;
src++;
}
src += src_stride - src_width;
dest += dest_stride - dest_width;
}
}
/* note that this function does packing conversion and blending at the
* same time */
void
gst_videomixer_blend_i420_i420 (guint8 * src, gint xpos, gint ypos,
gint src_width, gint src_height, gdouble src_alpha,
guint8 * dest, gint dest_width, gint dest_height)
{
guint8 *b_src;
guint8 *b_dest;
gint b_src_width = src_width;
gint b_src_height = src_height;
gint xoffset = 0;
gint yoffset = 0;
xpos = GST_ROUND_UP_2 (xpos);
ypos = GST_ROUND_UP_2 (ypos);
/* adjust src pointers for negative sizes */
if (xpos < 0) {
xoffset = -xpos;
b_src_width -= -xpos;
xpos = 0;
}
if (ypos < 0) {
yoffset += -ypos;
b_src_height -= -ypos;
ypos = 0;
}
/* If x or y offset are larger then the source it's outside of the picture */
if (xoffset > src_width || yoffset > src_width) {
return;
}
/* adjust width/height if the src is bigger than dest */
if (xpos + src_width > dest_width) {
b_src_width = dest_width - xpos;
}
if (ypos + src_height > dest_height) {
b_src_height = dest_height - ypos;
}
if (b_src_width < 0 || b_src_height < 0) {
return;
}
/* First mix Y, then U, then V */
b_src = src + VIDEO_Y_OFFSET (src_width, src_height);
b_dest = dest + VIDEO_Y_OFFSET (dest_width, dest_height);
gst_i420_do_blend (b_src + xoffset + yoffset * VIDEO_Y_ROWSTRIDE (src_width),
b_dest + xpos + ypos * VIDEO_Y_ROWSTRIDE (dest_width),
VIDEO_Y_ROWSTRIDE (src_width),
VIDEO_Y_ROWSTRIDE (dest_width), b_src_width, b_src_height,
dest_width, src_alpha);
b_src = src + VIDEO_U_OFFSET (src_width, src_height);
b_dest = dest + VIDEO_U_OFFSET (dest_width, dest_height);
gst_i420_do_blend (b_src + xoffset / 2 +
yoffset / 2 * VIDEO_U_ROWSTRIDE (src_width),
b_dest + xpos / 2 + ypos / 2 * VIDEO_U_ROWSTRIDE (dest_width),
VIDEO_U_ROWSTRIDE (src_width), VIDEO_U_ROWSTRIDE (dest_width),
b_src_width / 2, GST_ROUND_UP_2 (b_src_height) / 2, dest_width / 2,
src_alpha);
b_src = src + VIDEO_V_OFFSET (src_width, src_height);
b_dest = dest + VIDEO_V_OFFSET (dest_width, dest_height);
gst_i420_do_blend (b_src + xoffset / 2 +
yoffset / 2 * VIDEO_V_ROWSTRIDE (src_width),
b_dest + xpos / 2 + ypos / 2 * VIDEO_V_ROWSTRIDE (dest_width),
VIDEO_V_ROWSTRIDE (src_width), VIDEO_V_ROWSTRIDE (dest_width),
b_src_width / 2, GST_ROUND_UP_2 (b_src_height) / 2, dest_width / 2,
src_alpha);
}
#undef BLEND_MODE
/* fill a buffer with a checkerboard pattern */
void
gst_videomixer_fill_i420_checker (guint8 * dest, gint width, gint height)
{
int size;
gint i, j;
static const int tab[] = { 80, 160, 80, 160 };
guint8 *p = dest;
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
*p++ = tab[((i & 0x8) >> 3) + ((j & 0x8) >> 3)];
}
p += VIDEO_Y_ROWSTRIDE (width) - width;
}
size = (VIDEO_U_ROWSTRIDE (width) * height) / 2;
memset (dest + VIDEO_U_OFFSET (width, height), 0x80, size);
size = (VIDEO_V_ROWSTRIDE (width) * height) / 2;
memset (dest + VIDEO_V_OFFSET (width, height), 0x80, size);
}
void
gst_videomixer_fill_i420_color (guint8 * dest, gint width, gint height,
gint colY, gint colU, gint colV)
{
int size;
size = VIDEO_Y_ROWSTRIDE (width) * height;
memset (dest, colY, size);
size = (VIDEO_U_ROWSTRIDE (width) * height) / 2;
memset (dest + VIDEO_U_OFFSET (width, height), colU, size);
size = (VIDEO_V_ROWSTRIDE (width) * height) / 2;
memset (dest + VIDEO_V_OFFSET (width, height), colV, size);
}
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