ImageQuantize.cpp

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#include <vtfpp/ImageQuantize.h>
 
#include <vtfpp/ImagePixel.h>
 
using namespace vtfpp;
 
std::vector<std::byte> ImageQuantize::convertP8ImageDataToBGRA8888(std::span<const std::byte> paletteData, std::span<const std::byte> imageData) {
    if (paletteData.size() != 256 * sizeof(ImagePixel::BGRA8888)) {
        return {};
    }
 
    const std::span palettePixelData{reinterpret_cast<const ImagePixel::BGRA8888*>(paletteData.data()), 256};
 
    std::vector<std::byte> out;
    out.resize(imageData.size() * sizeof(ImagePixel::BGRA8888));
    BufferStream stream{out};
    for (const auto index : imageData) {
        stream << palettePixelData[static_cast<uint8_t>(index)];
    }
    return out;
}