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/**
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* @file common_impl.h
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*
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* Common code for implementing various renderers.
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*/
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#pragma once
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#include <cstdint>
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#include <cstddef>
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#include "engine.h"
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#include "lighting.h"
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namespace devilution {
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inline std::uint8_t *GetLightTable(char light)
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{
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int idx = 4096;
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if (light == 2)
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idx += 256; // gray colors
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if (light >= 4)
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idx += (light - 1) << 8;
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return &LightTables[idx];
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}
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struct ClipX {
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std::int_fast16_t left;
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std::int_fast16_t right;
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std::int_fast16_t width;
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};
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inline ClipX CalculateClipX(std::int_fast16_t x, std::size_t w, const Surface &out)
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{
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ClipX clip;
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clip.left = static_cast<std::int_fast16_t>(x < 0 ? -x : 0);
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clip.right = static_cast<std::int_fast16_t>(static_cast<std::int_fast16_t>(x + w) > out.w() ? x + w - out.w() : 0);
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clip.width = static_cast<std::int_fast16_t>(w - clip.left - clip.right);
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return clip;
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}
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} // namespace devilution
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