mirror of
https://github.com/game-stop/veejay.git
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58 lines
1.9 KiB
C
58 lines
1.9 KiB
C
/*
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* Linux VeeJay
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*
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* Copyright(C)2015 Niels Elburg <nelburg@gmail.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License , or (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307 , USA.
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*/
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#include "common.h"
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#include <veejaycore/vjmem.h>
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#include "alphablend.h"
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vj_effect *alphablend_init(int w, int h)
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{
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vj_effect *ve = (vj_effect *) vj_calloc(sizeof(vj_effect));
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ve->num_params = 0;
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ve->description = "Alpha: Blend";
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ve->sub_format = 1;
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ve->extra_frame = 1;
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ve->parallel = 1;
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ve->has_user = 0;
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ve->alpha = FLAG_ALPHA_SRC_A | FLAG_ALPHA_SRC_B;
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return ve;
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}
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static inline int blend_plane( uint8_t *dst, uint8_t *A, uint8_t *B, uint8_t *aA, size_t size )
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{
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size_t i;
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for( i = 0; i < size; i ++ )
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{
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unsigned int op0 = aA[i];
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unsigned int op1 = 0xff - op0;
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dst[i] = (op0 * A[i] + op1 * B[i] ) >> 8;
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}
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return 0;
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}
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void alphablend_apply( void *ptr, VJFrame *frame, VJFrame *frame2, int *args)
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{
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const int len = frame->len;
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const int uv_len = (frame->ssm ? len : frame->uv_len );
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blend_plane( frame->data[0], frame->data[0], frame2->data[0], frame->data[3], len );
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blend_plane( frame->data[1], frame->data[1], frame2->data[1], frame->data[3], uv_len );
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blend_plane( frame->data[2], frame->data[2], frame2->data[2], frame->data[3], uv_len );
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}
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