/* * 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]; } }