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267 lines
11 KiB
C
267 lines
11 KiB
C
/*
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* Copyright (C) 2004 Wim Taymans <wim@fluendo.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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#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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/* 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_ayuv_ayuv (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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gint alpha, b_alpha;
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gint i, j;
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gint src_stride, dest_stride;
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gint src_add, dest_add;
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gint Y, U, V;
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src_stride = src_width * 4;
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dest_stride = dest_width * 4;
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b_alpha = (gint) (src_alpha * 255);
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/* adjust src pointers for negative sizes */
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if (xpos < 0) {
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src += -xpos * 4;
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src_width -= -xpos;
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xpos = 0;
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}
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if (ypos < 0) {
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src += -ypos * src_stride;
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src_height -= -ypos;
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ypos = 0;
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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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src_width = dest_width - xpos;
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}
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if (ypos + src_height > dest_height) {
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src_height = dest_height - ypos;
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}
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src_add = src_stride - (4 * src_width);
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dest_add = dest_stride - (4 * src_width);
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dest = dest + 4 * xpos + (ypos * dest_stride);
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/* we convert a square of 2x2 samples to generate 4 Luma and 2 chroma samples */
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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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alpha = (src[0] * b_alpha) >> 8;
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BLEND_MODE (dest[1], dest[2], dest[3], src[1], src[2], src[3],
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alpha, Y, U, V);
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dest[0] = 0xff;
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dest[1] = Y;
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dest[2] = U;
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dest[3] = V;
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src += 4;
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dest += 4;
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}
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src += src_add;
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dest += dest_add;
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}
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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_ayuv_checker (guint8 * dest, gint width, gint height)
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{
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gint i, j;
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static const int tab[] = { 80, 160, 80, 160 };
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for (i = 0; i < height; i++) {
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for (j = 0; j < width; j++) {
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*dest++ = 0xff;
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*dest++ = tab[((i & 0x8) >> 3) + ((j & 0x8) >> 3)];
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*dest++ = 128;
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*dest++ = 128;
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}
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}
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}
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void
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gst_videomixer_fill_ayuv_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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gint i, j;
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for (i = 0; i < height; i++) {
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for (j = 0; j < width; j++) {
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*dest++ = 0xff;
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*dest++ = colY;
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*dest++ = colU;
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*dest++ = colV;
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}
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}
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}
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