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