noahbackus
9d30169a8d
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77 lines
3.6 KiB
C++
77 lines
3.6 KiB
C++
/**************************************************************************/
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/* rgb2yuv.h */
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/**************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/**************************************************************************/
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/**************************************************************************/
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#pragma once
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#include "core/typedefs.h"
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// For reference, see:
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// - https://stackoverflow.com/a/9467305
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// - https://en.wikipedia.org/wiki/YCbCr#Approximate_8-bit_matrices_for_BT.601
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static void _rgb2yuv420(uint8_t *y, uint8_t *u, uint8_t *v, uint8_t *rgb, size_t width, size_t height, size_t pixel_size) {
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size_t uvpos = 0;
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size_t i = 0;
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for (size_t line = 0; line < height; line += 2) {
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for (size_t x = 0; x < width; x += 2) {
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uint8_t r = rgb[pixel_size * i];
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uint8_t g = rgb[pixel_size * i + 1];
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uint8_t b = rgb[pixel_size * i + 2];
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y[i++] = ((66 * r + 129 * g + 25 * b) >> 8) + 16;
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u[uvpos] = ((-38 * r + -74 * g + 112 * b) >> 8) + 128;
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v[uvpos] = ((112 * r + -94 * g + -18 * b) >> 8) + 128;
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uvpos++;
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r = rgb[pixel_size * i];
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g = rgb[pixel_size * i + 1];
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b = rgb[pixel_size * i + 2];
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y[i++] = ((66 * r + 129 * g + 25 * b) >> 8) + 16;
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}
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for (size_t x = 0; x < width; x += 1) {
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uint8_t r = rgb[pixel_size * i];
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uint8_t g = rgb[pixel_size * i + 1];
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uint8_t b = rgb[pixel_size * i + 2];
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y[i++] = ((66 * r + 129 * g + 25 * b) >> 8) + 16;
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}
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}
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}
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static void rgb2yuv420(uint8_t *y, uint8_t *u, uint8_t *v, uint8_t *rgb, size_t width, size_t height) {
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_rgb2yuv420(y, u, v, rgb, width, height, 3);
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}
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static void rgba2yuv420(uint8_t *y, uint8_t *u, uint8_t *v, uint8_t *rgba, size_t width, size_t height) {
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_rgb2yuv420(y, u, v, rgba, width, height, 4);
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}
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