Function cursorFromBitMap

src/openrct2-ui/CursorData.cpp:22–71

    constexpr char kRawBlack = 'X';

    constexpr static CursorData cursorFromBitMap(int x, int y, std::string_view bitmap)
    {
        assert(bitmap.length() == kRawCursorSize);

        CursorData newCursor{};
        newCursor.HotSpot.X = x;
        newCursor.HotSpot.Y = y;

        uint8_t curBit{};
        uint16_t curPixel{};
        uint8_t dataByte{}, maskByte{};
        for (char rawPixel : bitmap)
        {
            uint8_t dataBit{}, maskBit{};
            switch (rawPixel)
            {
                case kRawBlack:
                    dataBit = 1;
                    maskBit = 1;
                    break;
                case kRawWhite:
                    dataBit = 0;
                    maskBit = 1;
                    break;
                case kRawTransparent:
                    dataBit = 0;
                    maskBit = 0;
                    break;
                default:
                    assert("Invalid character in cursor bitmap!");
            }

            dataByte |= (dataBit << (7 - curBit));
            maskByte |= (maskBit << (7 - curBit));

            // Save dataBit once 8 chars have been processed.
            curBit = (curBit + 1) % 8;
            if (curBit == 0)
            {
                newCursor.Data[curPixel] = dataByte;
                newCursor.Mask[curPixel] = maskByte;

                dataByte = 0;
                maskByte = 0;
                curPixel++;
            }
        }

        return newCursor;
    }

    static constexpr CursorData kBlankCursorData = { { 0, 0 }, { 0 }, { 0 } };