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337 lines
14 KiB
C
337 lines
14 KiB
C
/*
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* Copyright (C) 2006 Mindfruit Bv.
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* Author: Sjoerd Simons <sjoerd@luon.net>
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* Author: Alex Ugarte <alexugarte@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <gst/gst.h>
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#include <string.h>
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#include "videomixer.h"
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#define BLEND_NORMAL(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
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Y = ((Y1*(255-alpha))+(Y2*alpha))>>8; \
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U = ((U1*(255-alpha))+(U2*alpha))>>8; \
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V = ((V1*(255-alpha))+(V2*alpha))>>8;
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#define BLEND_ADD(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
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Y = Y1+((Y2*alpha)>>8); \
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U = U1+(((127*(255-alpha)+(U2*alpha)))>>8)-127; \
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V = V1+(((127*(255-alpha)+(V2*alpha)))>>8)-127; \
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if (Y>255) { \
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gint mult = MAX (0, 288-Y); \
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U = ((U*mult) + (127*(32-mult)))>>5; \
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V = ((V*mult) + (127*(32-mult)))>>5; \
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Y = 255; \
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} \
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U = MIN (U,255); \
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V = MIN (V,255);
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#define BLEND_SUBTRACT(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
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Y = Y1-((Y2*alpha)>>8); \
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U = U1+(((127*(255-alpha)+(U2*alpha)))>>8)-127; \
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V = V1+(((127*(255-alpha)+(V2*alpha)))>>8)-127; \
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if (Y<0) { \
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gint mult = MIN (32, -Y); \
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U = ((U*(32-mult)) + (127*mult))>>5; \
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V = ((V*(32-mult)) + (127*mult))>>5; \
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Y = 0; \
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}
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#define BLEND_DARKEN(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
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if (Y1 < Y2) { \
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Y = Y1; U = U1; V = V1; \
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} \
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else { \
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Y = ((Y1*(255-alpha))+(Y2*alpha))>>8; \
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U = ((U1*(255-alpha))+(U2*alpha))>>8; \
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V = ((V1*(255-alpha))+(V2*alpha))>>8; \
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}
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#define BLEND_LIGHTEN(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
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if (Y1 > Y2) { \
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Y = Y1; U = U1; V = V1; \
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} \
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else { \
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Y = ((Y1*(255-alpha))+(Y2*alpha))>>8; \
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U = ((U1*(255-alpha))+(U2*alpha))>>8; \
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V = ((V1*(255-alpha))+(V2*alpha))>>8; \
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}
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#define BLEND_MULTIPLY(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
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Y = (Y1*(256*(255-alpha) +(Y2*alpha)))>>16; \
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U = ((U1*(255-alpha)*256)+(alpha*(U1*Y2+128*(256-Y2))))>>16; \
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V = ((V1*(255-alpha)*256)+(alpha*(V1*Y2+128*(256-Y2))))>>16;
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#define BLEND_DIFFERENCE(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
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Y = ABS((gint)Y1-(gint)Y2)+127; \
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U = ABS((gint)U1-(gint)U2)+127; \
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V = ABS((gint)V1-(gint)V2)+127; \
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Y = ((Y*alpha)+(Y1*(255-alpha)))>>8; \
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U = ((U*alpha)+(U1*(255-alpha)))>>8; \
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V = ((V*alpha)+(V1*(255-alpha)))>>8; \
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if (Y>255) { \
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gint mult = MAX (0, 288-Y); \
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U = ((U*mult) + (127*(32-mult)))>>5; \
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V = ((V*mult) + (127*(32-mult)))>>5; \
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Y = 255; \
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} else if (Y<0) { \
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gint mult = MIN (32, -Y); \
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U = ((U*(32-mult)) + (127*mult))>>5; \
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V = ((V*(32-mult)) + (127*mult))>>5; \
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Y = 0; \
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} \
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U = CLAMP(U, 0, 255); \
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V = CLAMP(V, 0, 255);
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#define BLEND_EXCLUSION(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
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Y = ((gint)(Y1^0xff)*Y2+(gint)(Y2^0xff)*Y1)>>8; \
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U = ((gint)(U1^0xff)*Y2+(gint)(Y2^0xff)*U1)>>8; \
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V = ((gint)(V1^0xff)*Y2+(gint)(Y2^0xff)*V1)>>8; \
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Y = ((Y*alpha)+(Y1*(255-alpha)))>>8; \
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U = ((U*alpha)+(U1*(255-alpha)))>>8; \
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V = ((V*alpha)+(V1*(255-alpha)))>>8; \
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if (Y>255) { \
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gint mult = MAX (0, 288-Y); \
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U = ((U*mult) + (127*(32-mult)))>>5; \
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V = ((V*mult) + (127*(32-mult)))>>5; \
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Y = 255; \
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} else if (Y<0) { \
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gint mult = MIN (32, -Y); \
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U = ((U*(32-mult)) + (127*mult))>>5; \
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V = ((V*(32-mult)) + (127*mult))>>5; \
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Y = 0; \
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} \
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U = CLAMP(U, 0, 255); \
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V = CLAMP(V, 0, 255);
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#define BLEND_SOFTLIGHT(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
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Y = (gint)Y1+(gint)Y2 - 127; \
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U = (gint)U1+(gint)U2 - 127; \
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V = (gint)V1+(gint)V2 - 127; \
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Y = ((Y*alpha)+(Y1*(255-alpha)))>>8; \
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U = ((U*alpha)+(U1*(255-alpha)))>>8; \
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V = ((V*alpha)+(V1*(255-alpha)))>>8; \
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if (Y>255) { \
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gint mult = MAX (0, 288-Y); \
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U = ((U*mult) + (127*(32-mult)))>>5; \
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V = ((V*mult) + (127*(32-mult)))>>5; \
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Y = 255; \
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} else if (Y<0) { \
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gint mult = MIN (32, -Y); \
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U = ((U*(32-mult)) + (127*mult))>>5; \
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V = ((V*(32-mult)) + (127*mult))>>5; \
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Y = 0; \
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} \
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#define BLEND_HARDLIGHT(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
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Y = (gint)Y1+(gint)Y2*2 - 255; \
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U = (gint)U1+(gint)U2 - 127; \
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V = (gint)V1+(gint)V2 - 127; \
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Y = ((Y*alpha)+(Y1*(255-alpha)))>>8; \
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U = ((U*alpha)+(U1*(255-alpha)))>>8; \
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V = ((V*alpha)+(V1*(255-alpha)))>>8; \
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if (Y>255) { \
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gint mult = MAX (0, 288-Y); \
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U = ((U*mult) + (127*(32-mult)))>>5; \
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V = ((V*mult) + (127*(32-mult)))>>5; \
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Y = 255; \
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} else if (Y<0) { \
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gint mult = MIN (32, -Y); \
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U = ((U*(32-mult)) + (127*mult))>>5; \
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V = ((V*(32-mult)) + (127*mult))>>5; \
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Y = 0; \
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} \
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#define BLEND_MODE BLEND_NORMAL
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#if 0
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#define BLEND_MODE BLEND_NORMAL
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#define BLEND_MODE BLEND_ADD
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#define BLEND_MODE BLEND_SUBTRACT
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#define BLEND_MODE BLEND_LIGHTEN
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#define BLEND_MODE BLEND_DARKEN
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#define BLEND_MODE BLEND_MULTIPLY
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#define BLEND_MODE BLEND_DIFFERENCE
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#define BLEND_MODE BLEND_EXCLUSION
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#define BLEND_MODE BLEND_SOFTLIGHT
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#define BLEND_MODE BLEND_HARDLIGHT
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#endif
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/* I420 */
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/* Copied from jpegenc */
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#define VIDEO_Y_ROWSTRIDE(width) (GST_ROUND_UP_4(width))
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#define VIDEO_U_ROWSTRIDE(width) (GST_ROUND_UP_8(width)/2)
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#define VIDEO_V_ROWSTRIDE(width) ((GST_ROUND_UP_8(VIDEO_Y_ROWSTRIDE(width)))/2)
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#define VIDEO_Y_OFFSET(w,h) (0)
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#define VIDEO_U_OFFSET(w,h) (VIDEO_Y_OFFSET(w,h)+(VIDEO_Y_ROWSTRIDE(w)*GST_ROUND_UP_2(h)))
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#define VIDEO_V_OFFSET(w,h) (VIDEO_U_OFFSET(w,h)+(VIDEO_U_ROWSTRIDE(w)*GST_ROUND_UP_2(h)/2))
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#define VIDEO_SIZE(w,h) (VIDEO_V_OFFSET(w,h)+(VIDEO_V_ROWSTRIDE(w)*GST_ROUND_UP_2(h)/2))
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inline static void
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gst_i420_do_blend (guint8 * src, guint8 * dest,
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gint src_stride, gint dest_stride, gint src_width, gint src_height,
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gint dest_width, gdouble src_alpha)
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{
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int i, j;
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/* If it's completely transparent... we just return */
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if (G_UNLIKELY (src_alpha == 0.0)) {
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GST_INFO ("Fast copy (alpha == 0.0)");
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return;
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}
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/* If it's completely opaque, we do a fast copy */
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if (G_UNLIKELY (src_alpha == 1.0)) {
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GST_INFO ("Fast copy (alpha == 1.0)");
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for (i = 0; i < src_height; i++) {
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memcpy (dest, src, src_width);
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src += src_stride;
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dest += dest_stride;
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}
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return;
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}
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for (i = 0; i < src_height; i++) {
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for (j = 0; j < src_width; j++) {
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*dest = src_alpha * (*src) + (1. - src_alpha) * (*dest);
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dest++;
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src++;
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}
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src += src_stride - src_width;
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dest += dest_stride - dest_width;
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}
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}
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/* note that this function does packing conversion and blending at the
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* same time */
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void
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gst_videomixer_blend_i420_i420 (guint8 * src, gint xpos, gint ypos,
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gint src_width, gint src_height, gdouble src_alpha,
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guint8 * dest, gint dest_width, gint dest_height)
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{
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guint8 *b_src;
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guint8 *b_dest;
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gint b_src_width = src_width;
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gint b_src_height = src_height;
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gint xoffset = 0;
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gint yoffset = 0;
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xpos = GST_ROUND_UP_2 (xpos);
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ypos = GST_ROUND_UP_2 (ypos);
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/* adjust src pointers for negative sizes */
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if (xpos < 0) {
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xoffset = -xpos;
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b_src_width -= -xpos;
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xpos = 0;
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}
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if (ypos < 0) {
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yoffset += -ypos;
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b_src_height -= -ypos;
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ypos = 0;
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}
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/* If x or y offset are larger then the source it's outside of the picture */
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if (xoffset > src_width || yoffset > src_width) {
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return;
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}
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/* adjust width/height if the src is bigger than dest */
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if (xpos + src_width > dest_width) {
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b_src_width = dest_width - xpos;
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}
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if (ypos + src_height > dest_height) {
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b_src_height = dest_height - ypos;
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}
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if (b_src_width < 0 || b_src_height < 0) {
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return;
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}
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/* First mix Y, then U, then V */
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b_src = src + VIDEO_Y_OFFSET (src_width, src_height);
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b_dest = dest + VIDEO_Y_OFFSET (dest_width, dest_height);
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gst_i420_do_blend (b_src + xoffset + yoffset * VIDEO_Y_ROWSTRIDE (src_width),
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b_dest + xpos + ypos * VIDEO_Y_ROWSTRIDE (dest_width),
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VIDEO_Y_ROWSTRIDE (src_width),
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VIDEO_Y_ROWSTRIDE (dest_width), b_src_width, b_src_height,
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dest_width, src_alpha);
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b_src = src + VIDEO_U_OFFSET (src_width, src_height);
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b_dest = dest + VIDEO_U_OFFSET (dest_width, dest_height);
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gst_i420_do_blend (b_src + xoffset / 2 +
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yoffset / 2 * VIDEO_U_ROWSTRIDE (src_width),
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b_dest + xpos / 2 + ypos / 2 * VIDEO_U_ROWSTRIDE (dest_width),
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VIDEO_U_ROWSTRIDE (src_width), VIDEO_U_ROWSTRIDE (dest_width),
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b_src_width / 2, GST_ROUND_UP_2 (b_src_height) / 2, dest_width / 2,
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src_alpha);
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b_src = src + VIDEO_V_OFFSET (src_width, src_height);
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b_dest = dest + VIDEO_V_OFFSET (dest_width, dest_height);
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gst_i420_do_blend (b_src + xoffset / 2 +
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yoffset / 2 * VIDEO_V_ROWSTRIDE (src_width),
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b_dest + xpos / 2 + ypos / 2 * VIDEO_V_ROWSTRIDE (dest_width),
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VIDEO_V_ROWSTRIDE (src_width), VIDEO_V_ROWSTRIDE (dest_width),
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b_src_width / 2, GST_ROUND_UP_2 (b_src_height) / 2, dest_width / 2,
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src_alpha);
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}
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#undef BLEND_MODE
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/* fill a buffer with a checkerboard pattern */
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void
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gst_videomixer_fill_i420_checker (guint8 * dest, gint width, gint height)
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{
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int size;
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gint i, j;
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static const int tab[] = { 80, 160, 80, 160 };
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guint8 *p = dest;
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for (i = 0; i < height; i++) {
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for (j = 0; j < width; j++) {
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*p++ = tab[((i & 0x8) >> 3) + ((j & 0x8) >> 3)];
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}
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p += VIDEO_Y_ROWSTRIDE (width) - width;
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}
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size = (VIDEO_U_ROWSTRIDE (width) * height) / 2;
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memset (dest + VIDEO_U_OFFSET (width, height), 0x80, size);
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size = (VIDEO_V_ROWSTRIDE (width) * height) / 2;
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memset (dest + VIDEO_V_OFFSET (width, height), 0x80, size);
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}
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void
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gst_videomixer_fill_i420_color (guint8 * dest, gint width, gint height,
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gint colY, gint colU, gint colV)
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{
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int size;
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size = VIDEO_Y_ROWSTRIDE (width) * height;
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memset (dest, colY, size);
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size = (VIDEO_U_ROWSTRIDE (width) * height) / 2;
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memset (dest + VIDEO_U_OFFSET (width, height), colU, size);
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size = (VIDEO_V_ROWSTRIDE (width) * height) / 2;
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memset (dest + VIDEO_V_OFFSET (width, height), colV, size);
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}
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