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With this BitmapMixer one can draw one Bitmap onto another with different modes. For now the only supported mixing methods implemented are Add and Lightest (which is very naive).
49 lines
1.7 KiB
C++
49 lines
1.7 KiB
C++
/*
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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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