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58 lines
1.7 KiB
58 lines
1.7 KiB
#pragma once |
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#include <cstdint> |
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#include "appfat.h" |
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#include "utils/attributes.h" |
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namespace devilution { |
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[[nodiscard]] constexpr bool IsClxOpaque(uint8_t control) |
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{ |
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constexpr uint8_t ClxOpaqueMin = 0x80; |
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return control >= ClxOpaqueMin; |
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} |
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[[nodiscard]] constexpr uint8_t GetClxOpaquePixelsWidth(uint8_t control) |
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{ |
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return -static_cast<int8_t>(control); |
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} |
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[[nodiscard]] constexpr bool IsClxOpaqueFill(uint8_t control) |
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{ |
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constexpr uint8_t ClxFillMax = 0xBE; |
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return control <= ClxFillMax; |
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} |
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[[nodiscard]] constexpr uint8_t GetClxOpaqueFillWidth(uint8_t control) |
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{ |
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constexpr uint8_t ClxFillEnd = 0xBF; |
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return ClxFillEnd - control; |
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} |
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struct SkipSize { |
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int_fast16_t wholeLines; |
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int_fast16_t xOffset; |
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}; |
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// Returns the number of lines and the x-offset by which the rendering has overrun |
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// the current line (when a CLX command overruns the current line). |
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// |
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// Requires: remainingWidth <= 0. |
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DVL_ALWAYS_INLINE SkipSize GetSkipSize(int_fast16_t remainingWidth, int_fast16_t srcWidth) |
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{ |
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// If `remainingWidth` is negative, `-remainingWidth` is the overrun. |
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// Otherwise, `remainingWidth` is always 0. |
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// Remaining width of 0 (= no overrun) is a common case. |
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// The calculation below would result in the same result. |
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// However, checking for 0 and skipping it entirely turns out to be faster. |
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if (remainingWidth == 0) return { 1, 0 }; |
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const auto overrun = static_cast<uint_fast16_t>(-remainingWidth); |
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const uint_fast16_t overrunLines = overrun / srcWidth + 1; |
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const uint_fast16_t xOffset = overrun % srcWidth; |
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return { static_cast<int_fast16_t>(overrunLines), static_cast<int_fast16_t>(xOffset) }; |
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} |
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} // namespace devilution
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