DistanceMapping.h

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#pragma once
 
#include <vector>
 
#include <sourcepp/Macros.h>
#include <vtfpp/ImageConversion.h>
 
namespace vtfpp::DistanceMapping {
 
enum class Dither {
    NONE = 0, 
    GRADIENT_TANGENT, 
    // anything generic that doesn't depend on the geometry of the distance field (floyd-steinberg etc) would belong somewhere more general.
};
 
enum class Flags : uint32_t {
    NONE           = 0,
    DISTANCEAA     = 1 << 0, 
    EUCLIDEAN      = 1 << 1, 
    SAMPLECENTERED = 1 << 2, 
};
SOURCEPP_BITFLAGS_ENUM(Flags)
 

[[nodiscard]] std::vector<std::byte> alphaToDistance(
    std::span<const std::byte> imageData,
    ImageFormat inFormat, 
    ImageFormat outFormat, 
    uint16_t width,
    uint16_t height,
    uint16_t reduceX, 
    uint16_t reduceY, 
    bool srgb, 
    float distanceSpread = 1.f, 
    float alphaThreshold = 0.04f, 
    Flags flags = Flags::NONE, 
    Dither dither = Dither::NONE, 
    ImageConversion::ResizeFilter filter = ImageConversion::ResizeFilter::NICE, 
    ImageConversion::ResizeEdge edge = ImageConversion::ResizeEdge::CLAMP, 
    bool* valveQuirks = nullptr 
);
 
} // namespace vtfpp::DistanceMapping