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/*
* Copyright (c) 2022, Tobias Christiansen <tobyase@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "BitmapMixer.h"
namespace Gfx {
void BitmapMixer::mix_with(Bitmap& other_bitmap, MixingMethod mixing_method)
{
VERIFY(m_bitmap.size() == other_bitmap.size());
int height = m_bitmap.height();
int width = m_bitmap.width();
for (int y = 0; y < height; ++y) {
for (int x = 0; x < width; ++x) {
auto original_color = m_bitmap.get_pixel(x, y);
auto other_color = other_bitmap.get_pixel(x, y);
Color output_color = { 0, 0, 0, original_color.alpha() };
switch (mixing_method) {
case MixingMethod::Add:
output_color.set_red(original_color.red() + other_color.red());
output_color.set_green(original_color.green() + other_color.green());
output_color.set_blue(original_color.blue() + other_color.blue());
break;
case MixingMethod::Lightest:
auto original_lightness = original_color.red() + original_color.green() + original_color.blue();
auto other_lightness = other_color.red() + other_color.green() + other_color.blue();
if (original_lightness > other_lightness) {
output_color = original_color;
} else {
output_color.set_red(other_color.red());
output_color.set_green(other_color.green());
output_color.set_blue(other_color.blue());
}
break;
}
if (original_color != output_color)
m_bitmap.set_pixel(x, y, output_color);
}
}
}
}
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