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/*
* Copyright (c) 2020 Yaroslav Pogrebnyak <yyyaroslav@gmail.com>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
extern "C" {
__global__ void Overlay_Cuda(
int x_position, int y_position,
unsigned char* main, int main_linesize,
unsigned char* overlay, int overlay_linesize,
int overlay_w, int overlay_h,
unsigned char* overlay_alpha, int alpha_linesize,
int alpha_adj_x, int alpha_adj_y)
{
int x = blockIdx.x * blockDim.x + threadIdx.x;
int y = blockIdx.y * blockDim.y + threadIdx.y;
if (x >= overlay_w + x_position ||
y >= overlay_h + y_position ||
x < x_position ||
y < y_position ) {
return;
}
int overlay_x = x - x_position;
int overlay_y = y - y_position;
float alpha = 1.0;
if (alpha_linesize) {
alpha = overlay_alpha[alpha_adj_x * overlay_x + alpha_adj_y * overlay_y * alpha_linesize] / 255.0f;
}
main[x + y*main_linesize] = alpha * overlay[overlay_x + overlay_y * overlay_linesize] + (1.0f - alpha) * main[x + y*main_linesize];
}
}
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