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37 lines
1.5 KiB
C++
37 lines
1.5 KiB
C++
/*
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This Source Code Form is subject to the
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terms of the Mozilla Public License, v.
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2.0. If a copy of the MPL was not
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distributed with this file, You can
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obtain one at
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http://mozilla.org/MPL/2.0/.
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*/
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#pragma once
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#include <cstdint>
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#include <span>
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// image filters the wasm screens call through the host (eu07.led_post, eu07.resize_lanczos), run natively rather than
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// in the interpreter. they give the very pixels of the Python screens: led_util.render_post() and Pillow's
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// resize(..., Image.LANCZOS). the images are RGBA, 4 bytes a pixel, row by row; alpha is ignored and written as 255
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namespace wasm_screens
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{
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// the size in bytes of an RGBA image
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constexpr std::size_t image_size(int const Width, int const Height)
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{
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return static_cast<std::size_t>(Width) * static_cast<std::size_t>(Height) * 4;
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}
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// led_util's render_post: every diode becomes 2x2 pixels with a darker grid between them, glowing into its neighbours
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// (Bloom), in a 1 pixel black frame. Target takes (2 Width + 2) x (2 Height + 2) pixels. returns false for sizes that
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// don't fit the spans
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bool led_post(std::span<std::uint8_t const> Source, int Width, int Height, std::span<std::uint8_t> Target, bool Bloom);
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// Pillow's resize with the Lanczos filter, horizontally then vertically, each pass rounded to 8 bits. returns false
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// for sizes that don't fit the spans
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bool resize_lanczos(std::span<std::uint8_t const> Source, int Width, int Height, std::span<std::uint8_t> Target, int TargetWidth, int TargetHeight);
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} // namespace wasm_screens
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