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