qdrawhelper.cpp

奇趣公司比较新的qt/emd版本

static void QT_FASTCALL comp_func_SourceIn(uint *dest, const uint *src, int length, uint const_alpha)
{
    if (const_alpha == 255) {
        for (int i = 0; i < length; ++i)
            dest[i] = BYTE_MUL(src[i], qAlpha(dest[i]));
    } else {
        uint cia = 255 - const_alpha;
        for (int i = 0; i < length; ++i) {
            uint d = dest[i];
            uint s = BYTE_MUL(src[i], const_alpha);
            dest[i] = INTERPOLATE_PIXEL_255(s, qAlpha(d), d, cia);
        }
    }
}

/*
  result = d * sa
  dest = d * sa * ca + d * cia
       = d * (sa * ca + cia)
*/
static void QT_FASTCALL comp_func_solid_DestinationIn(uint *dest, int length, uint color, uint const_alpha)
{
    uint a = qAlpha(color);
    if (const_alpha != 255) {
        a = BYTE_MUL(a, const_alpha) + 255 - const_alpha;
    }
    for (int i = 0; i < length; ++i) {
        dest[i] = BYTE_MUL(dest[i], a);
    }
}

static void QT_FASTCALL comp_func_DestinationIn(uint *dest, const uint *src, int length, uint const_alpha)
{
    if (const_alpha == 255) {
        for (int i = 0; i < length; ++i)
            dest[i] = BYTE_MUL(dest[i], qAlpha(src[i]));
    } else {
        int cia = 255 - const_alpha;
        for (int i = 0; i < length; ++i) {
            uint a = BYTE_MUL(qAlpha(src[i]), const_alpha) + cia;
            dest[i] = BYTE_MUL(dest[i], a);
        }
    }
}

/*
  result = s * dia
  dest = s * dia * ca + d * cia
*/

static void QT_FASTCALL comp_func_solid_SourceOut(uint *dest, int length, uint color, uint const_alpha)
{
    if (const_alpha == 255) {
        for (int i = 0; i < length; ++i)
            dest[i] = BYTE_MUL(color, qAlpha(~dest[i]));
    } else {
        color = BYTE_MUL(color, const_alpha);
        int cia = 255 - const_alpha;
        for (int i = 0; i < length; ++i) {
            uint d = dest[i];
            dest[i] = INTERPOLATE_PIXEL_255(color, qAlpha(~d), d, cia);
        }
    }
}

static void QT_FASTCALL comp_func_SourceOut(uint *dest, const uint *src, int length, uint const_alpha)
{
    if (const_alpha == 255) {
        for (int i = 0; i < length; ++i)
            dest[i] = BYTE_MUL(src[i], qAlpha(~dest[i]));
    } else {
        int cia = 255 - const_alpha;
        for (int i = 0; i < length; ++i) {
            uint s = BYTE_MUL(src[i], const_alpha);
            uint d = dest[i];
            dest[i] = INTERPOLATE_PIXEL_255(s, qAlpha(~d), d, cia);
        }
    }
}

/*
  result = d * sia
  dest = d * sia * ca + d * cia
       = d * (sia * ca + cia)
*/
static void QT_FASTCALL comp_func_solid_DestinationOut(uint *dest, int length, uint color, uint const_alpha)
{
    uint a = qAlpha(~color);
    if (const_alpha != 255)
        a = BYTE_MUL(a, const_alpha) + 255 - const_alpha;
    for (int i = 0; i < length; ++i)
        dest[i] = BYTE_MUL(dest[i], a);
}

static void QT_FASTCALL comp_func_DestinationOut(uint *dest, const uint *src, int length, uint const_alpha)
{
    if (const_alpha == 255) {
        for (int i = 0; i < length; ++i)
            dest[i] = BYTE_MUL(dest[i], qAlpha(~src[i]));
    } else {
        int cia = 255 - const_alpha;
        for (int i = 0; i < length; ++i) {
            uint sia = BYTE_MUL(qAlpha(~src[i]), const_alpha) + cia;
            dest[i] = BYTE_MUL(dest[i], sia);
        }
    }
}

/*
  result = s*da + d*sia
  dest = s*da*ca + d*sia*ca + d *cia
       = s*ca * da + d * (sia*ca + cia)
       = s*ca * da + d * (1 - sa*ca)
*/
static void QT_FASTCALL comp_func_solid_SourceAtop(uint *dest, int length, uint color, uint const_alpha)
{
    if (const_alpha != 255) {
        color = BYTE_MUL(color, const_alpha);
    }
    uint sia = qAlpha(~color);
    for (int i = 0; i < length; ++i)
        dest[i] = INTERPOLATE_PIXEL_255(color, qAlpha(dest[i]), dest[i], sia);
}

static void QT_FASTCALL comp_func_SourceAtop(uint *dest, const uint *src, int length, uint const_alpha)
{
    if (const_alpha == 255) {
        for (int i = 0; i < length; ++i) {
            uint s = src[i];
            uint d = dest[i];
            dest[i] = INTERPOLATE_PIXEL_255(s, qAlpha(d), d, qAlpha(~s));
        }
    } else {
        for (int i = 0; i < length; ++i) {
            uint s = BYTE_MUL(src[i], const_alpha);
            uint d = dest[i];
            dest[i] = INTERPOLATE_PIXEL_255(s, qAlpha(d), d, qAlpha(~s));
        }
    }
}

/*
  result = d*sa + s*dia
  dest = d*sa*ca + s*dia*ca + d *cia
       = s*ca * dia + d * (sa*ca + cia)
*/
static void QT_FASTCALL comp_func_solid_DestinationAtop(uint *dest, int length, uint color, uint const_alpha)
{
    uint a = qAlpha(color);
    if (const_alpha != 255) {
        color = BYTE_MUL(color, const_alpha);
        a = qAlpha(color) + 255 - const_alpha;
    }
    for (int i = 0; i < length; ++i) {
        uint d = dest[i];
        dest[i] = INTERPOLATE_PIXEL_255(d, a, color, qAlpha(~d));
    }
}

static void QT_FASTCALL comp_func_DestinationAtop(uint *dest, const uint *src, int length, uint const_alpha)
{
    if (const_alpha == 255) {
        for (int i = 0; i < length; ++i) {
            uint s = src[i];
            uint d = dest[i];
            dest[i] = INTERPOLATE_PIXEL_255(d, qAlpha(s), s, qAlpha(~d));
        }
    } else {
        int cia = 255 - const_alpha;
        for (int i = 0; i < length; ++i) {
            uint s = BYTE_MUL(src[i], const_alpha);
            uint d = dest[i];
            uint a = qAlpha(s) + cia;
            dest[i] = INTERPOLATE_PIXEL_255(d, a, s, qAlpha(~d));
        }
    }
}

/*
  result = d*sia + s*dia
  dest = d*sia*ca + s*dia*ca + d *cia
       = s*ca * dia + d * (sia*ca + cia)
       = s*ca * dia + d * (1 - sa*ca)
*/
static void QT_FASTCALL comp_func_solid_XOR(uint *dest, int length, uint color, uint const_alpha)
{
    if (const_alpha != 255)
        color = BYTE_MUL(color, const_alpha);
    uint sia = qAlpha(~color);

    for (int i = 0; i < length; ++i) {
        uint d = dest[i];
        dest[i] = INTERPOLATE_PIXEL_255(color, qAlpha(~d), d, sia);
    }
}

static void QT_FASTCALL comp_func_XOR(uint *dest, const uint *src, int length, uint const_alpha)
{
    if (const_alpha == 255) {
        for (int i = 0; i < length; ++i) {
            uint d = dest[i];
            uint s = src[i];
            dest[i] = INTERPOLATE_PIXEL_255(s, qAlpha(~d), d, qAlpha(~s));
        }
    } else {
        for (int i = 0; i < length; ++i) {
            uint d = dest[i];
            uint s = BYTE_MUL(src[i], const_alpha);
            dest[i] = INTERPOLATE_PIXEL_255(s, qAlpha(~d), d, qAlpha(~s));
        }
    }
}

static const uint AMASK = 0xff000000;
static const uint RMASK = 0x00ff0000;
static const uint GMASK = 0x0000ff00;
static const uint BMASK = 0x000000ff;

struct FullCoverage {
    inline void store(uint *dest, const uint src) const
    {
        *dest = src;
    }
};

struct PartialCoverage {
    inline PartialCoverage(uint const_alpha)
        : ca(const_alpha)
        , ica(255 - const_alpha)
    {
    }

    inline void store(uint *dest, const uint src) const
    {
        *dest = INTERPOLATE_PIXEL_255(src, ca, *dest, ica);
    }

private:
    const uint ca;
    const uint ica;
};

static inline int mix_alpha(int da, int sa)
{
    return 255 - ((255 - sa) * (255 - da) >> 8);
}

/*
    Dca' = Sca.Da + Dca.Sa + Sca.(1 - Da) + Dca.(1 - Sa)
         = Sca + Dca
*/
template <typename T>
static inline void comp_func_solid_Plus_impl(uint *dest, int length, uint color, const T &coverage)
{
    uint s = color;

    for (int i = 0; i < length; ++i) {
        uint d = dest[i];
#define MIX(mask) (qMin(((qint64(s)&mask) + (qint64(d)&mask)), qint64(mask)))
        d = (MIX(AMASK) | MIX(RMASK) | MIX(GMASK) | MIX(BMASK));
#undef MIX
        coverage.store(&dest[i], d);
    }
}

void QT_FASTCALL comp_func_solid_Plus(uint *dest, int length, uint color, uint const_alpha)
{
    if (const_alpha == 255)
        comp_func_solid_Plus_impl(dest, length, color, FullCoverage());
    else
        comp_func_solid_Plus_impl(dest, length, color, PartialCoverage(const_alpha));
}

template <typename T>
static inline void comp_func_Plus_impl(uint *dest, const uint *src, int length, const T &coverage)
{
    for (int i = 0; i < length; ++i) {
        uint d = dest[i];
        uint s = src[i];

#define MIX(mask) (qMin(((qint64(s)&mask) + (qint64(d)&mask)), qint64(mask)))
        d = (MIX(AMASK) | MIX(RMASK) | MIX(GMASK) | MIX(BMASK));
#undef MIX

        coverage.store(&dest[i], d);
    }
}

void QT_FASTCALL comp_func_Plus(uint *dest, const uint *src, int length, uint const_alpha)
{
    if (const_alpha == 255)
        comp_func_Plus_impl(dest, src, length, FullCoverage());
    else
        comp_func_Plus_impl(dest, src, length, PartialCoverage(const_alpha));
}

/*
    Dca' = Sca.Dca + Sca.(1 - Da) + Dca.(1 - Sa)
*/
static inline int multiply_op(int dst, int src, int da, int sa)
{
    return (src * dst + src * (255 - da) + dst * (255 - sa)) >> 8;
}

template <typename T>
static inline void comp_func_solid_Multiply_impl(uint *dest, int length, uint color, const T &coverage)
{
    int sa = qAlpha(color);
    int sr = qRed(color);
    int sg = qGreen(color);
    int sb = qBlue(color);

    for (int i = 0; i < length; ++i) {
        uint d = dest[i];
        int da = qAlpha(d);

#define OP(a, b) multiply_op(a, b, da, sa)
        int r = OP(  qRed(d), sr);
        int b = OP( qBlue(d), sb);
        int g = OP(qGreen(d), sg);
        int a = mix_alpha(da, sa);
#undef OP

        coverage.store(&dest[i], qRgba(r, g, b, a));
    }
}

void QT_FASTCALL comp_func_solid_Multiply(uint *dest, int length, uint color, uint const_alpha)
{
    if (const_alpha == 255)
        comp_func_solid_Multiply_impl(dest, length, color, FullCoverage());
    else
        comp_func_solid_Multiply_impl(dest, length, color, PartialCoverage(const_alpha));
}

template <typename T>
static inline void comp_func_Multiply_impl(uint *dest, const uint *src, int length, const T &coverage)
{
    for (int i = 0; i < length; ++i) {
        uint d = dest[i];
        uint s = src[i];

        int da = qAlpha(d);
        int sa = qAlpha(s);

#define OP(a, b) multiply_op(a, b, da, sa)
        int r = OP(  qRed(d),   qRed(s));
        int b = OP( qBlue(d),  qBlue(s));
        int g = OP(qGreen(d), qGreen(s));
        int a = mix_alpha(da, sa);
#undef OP

        coverage.store(&dest[i], qRgba(r, g, b, a));
    }
}

void QT_FASTCALL comp_func_Multiply(uint *dest, const uint *src, int length, uint const_alpha)
{
    if (const_alpha == 255)
        comp_func_Multiply_impl(dest, src, length, FullCoverage());
    else
        comp_func_Multiply_impl(dest, src, length, PartialCoverage(const_alpha));
}

/*
    Dca' = (Sca.Da + Dca.Sa - Sca.Dca) + Sca.(1 - Da) + Dca.(1 - Sa)
         = Sca + Dca - Sca.Dca
*/
template <typename T>
static inline void comp_func_solid_Screen_impl(uint *dest, int length, uint color, const T &coverage)
{
    int sa = qAlpha(color);
    int sr = qRed(color);
    int sg = qGreen(color);
    int sb = qBlue(color);

    for (int i = 0; i < length; ++i) {
        uint d = dest[i];
        int da = qAlpha(d);

#define OP(a, b) 255 - (((255-a) * (255-b)) >> 8)
        int r = OP(  qRed(d), sr);
        int b = OP( qBlue(d), sb);
        int g = OP(qGreen(d), sg);
        int a = mix_alpha(da, sa);
#undef OP

        coverage.store(&dest[i], qRgba(r, g, b, a));
    }
}

void QT_FASTCALL comp_func_solid_Screen(uint *dest, int length, uint color, uint const_alpha)
{
    if (const_alpha == 255)
        comp_func_solid_Screen_impl(dest, length, color, FullCoverage());
    else
        comp_func_solid_Screen_impl(dest, length, color, PartialCoverage(const_alpha));
}

template <typename T>
static inline void comp_func_Screen_impl(uint *dest, const uint *src, int length, const T &coverage)
{
    for (int i = 0; i < length; ++i) {
        uint d = dest[i];
        uint s = src[i];

        int da = qAlpha(d);
        int sa = qAlpha(s);

#define OP(a, b) 255 - (((255-a) * (255-b)) >> 8)
        int r = OP(  qRed(d),   qRed(s));
        int b = OP( qBlue(d),  qBlue(s));
        int g = OP(qGreen(d), qGreen(s));
        int a = mix_alpha(da, sa);
#undef OP

        coverage.store(&dest[i], qRgba(r, g, b, a));
    }
}

void QT_FASTCALL comp_func_Screen(uint *dest, const uint *src, int length, uint const_alpha)
{
    if (const_alpha == 255)