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#include "private/qmemrotate_p.h"

QT_BEGIN_NAMESPACE

#if QT_ROTATION_ALGORITHM == QT_ROTATION_TILED

static const int tileSize = 32;

#endif

#if Q_BYTE_ORDER == Q_BIG_ENDIAN

#if QT_ROTATION_ALGORITHM == QT_ROTATION_PACKED || QT_ROTATION_ALGORITHM == QT_ROTATION_TILED

#error Big endian version not implemented for the transformed driver!

#endif

#endif

template <class DST, class SRC>

Q_STATIC_TEMPLATE_FUNCTION inline void qt_memrotate90_cachedRead(const SRC *src, int w, int h,

                                             int sstride,

                                             DST *dest, int dstride)

{

    const char *s = reinterpret_cast<const char*>(src);

    char *d = reinterpret_cast<char*>(dest);

    for (int y = 0; y < h; ++y) {

        for (int x = w - 1; x >= 0; --x) {

            DST *destline = reinterpret_cast<DST*>(d + (w - x - 1) * dstride);

            destline[y] = qt_colorConvert<DST,SRC>(src[x], 0);

        }

        s += sstride;

        src = reinterpret_cast<const SRC*>(s);

    }

}

template <class DST, class SRC>

Q_STATIC_TEMPLATE_FUNCTION inline void qt_memrotate270_cachedRead(const SRC *src, int w, int h,

                                              int sstride,

                                              DST *dest, int dstride)

{

    const char *s = reinterpret_cast<const char*>(src);

    char *d = reinterpret_cast<char*>(dest);

    s += (h - 1) * sstride;

    for (int y = h - 1; y >= 0; --y) {

        src = reinterpret_cast<const SRC*>(s);

        for (int x = 0; x < w; ++x) {

            DST *destline = reinterpret_cast<DST*>(d + x * dstride);

            destline[h - y - 1] = qt_colorConvert<DST,SRC>(src[x], 0);

        }

        s -= sstride;

    }

}

#if QT_ROTATION_ALGORITHM == QT_ROTATION_CACHEDWRITE

template <class DST, class SRC>

Q_STATIC_TEMPLATE_FUNCTION inline void qt_memrotate90_cachedWrite(const SRC *src, int w, int h,

                                              int sstride,

                                              DST *dest, int dstride)

{

    for (int x = w - 1; x >= 0; --x) {

        DST *d = dest + (w - x - 1) * dstride;

        for (int y = 0; y < h; ++y) {

            *d++ = qt_colorConvert<DST,SRC>(src[y * sstride + x], 0);

        }

    }

}

template <class DST, class SRC>

Q_STATIC_TEMPLATE_FUNCTION inline void qt_memrotate270_cachedWrite(const SRC *src, int w, int h,

                                               int sstride,

                                               DST *dest, int dstride)

{

    for (int x = 0; x < w; ++x) {

        DST *d = dest + x * dstride;

        for (int y = h - 1; y >= 0; --y) {

            *d++ = qt_colorConvert<DST,SRC>(src[y * sstride + x], 0);

        }

    }

}

#endif // QT_ROTATION_CACHEDWRITE

#if QT_ROTATION_ALGORITHM == QT_ROTATION_PACKING

// TODO: packing algorithms should probably be modified on 64-bit architectures

template <class DST, class SRC>

Q_STATIC_TEMPLATE_FUNCTION inline void qt_memrotate90_packing(const SRC *src, int w, int h,

                                          int sstride,

                                          DST *dest, int dstride)

{

    sstride /= sizeof(SRC);

    dstride /= sizeof(DST);

    const int pack = sizeof(quint32) / sizeof(DST);

    const int unaligned = int((long(dest) & (sizeof(quint32)-1))) / sizeof(DST);

    for (int x = w - 1; x >= 0; --x) {

        int y = 0;

        for (int i = 0; i < unaligned; ++i) {

            dest[(w - x - 1) * dstride + y]

                = qt_colorConvert<DST,SRC>(src[y * sstride + x], 0);

            ++y;

        }

        quint32 *d = reinterpret_cast<quint32*>(dest + (w - x - 1) * dstride

                                                + unaligned);

        const int rest = (h - unaligned) % pack;

        while (y < h - rest) {

            quint32 c = qt_colorConvert<DST,SRC>(src[y * sstride + x], 0);

            for (int i = 1; i < pack; ++i) {

                c |= qt_colorConvert<DST,SRC>(src[(y + i) * sstride + x], 0)

                     << (sizeof(int) * 8 / pack * i);

            }

            *d++ = c;

            y += pack;

        }

        while (y < h) {

            dest[(w - x - 1) * dstride + y]

                = qt_colorConvert<DST,SRC>(src[y * sstride + x], 0);

            ++y;

        }

    }

}

template <class DST, class SRC>

Q_STATIC_TEMPLATE_FUNCTION inline void qt_memrotate270_packing(const SRC *src, int w, int h,

                                           int sstride,

                                           DST *dest, int dstride)

{

    sstride /= sizeof(SRC);

    dstride /= sizeof(DST);

    const int pack = sizeof(quint32) / sizeof(DST);

    const int unaligned = int((long(dest) & (sizeof(quint32)-1))) / sizeof(DST);

    for (int x = 0; x < w; ++x) {

        int y = h - 1;

        for (int i = 0; i < unaligned; ++i) {

            dest[x * dstride + h - y - 1]

                = qt_colorConvert<DST,SRC>(src[y * sstride + x], 0);

            --y;

        }

        quint32 *d = reinterpret_cast<quint32*>(dest + x * dstride

                                                + unaligned);

        const int rest = (h - unaligned) % pack;

        while (y > rest) {

            quint32 c = qt_colorConvert<DST,SRC>(src[y * sstride + x], 0);

            for (int i = 1; i < pack; ++i) {

                c |= qt_colorConvert<DST,SRC>(src[(y - i) * sstride + x], 0)

                     << (sizeof(int) * 8 / pack * i);

            }

            *d++ = c;

            y -= pack;

        }

        while (y >= 0) {

            dest[x * dstride + h - y - 1]

                = qt_colorConvert<DST,SRC>(src[y * sstride + x], 0);

            --y;

        }

    }

}

#endif // QT_ROTATION_PACKING

#if QT_ROTATION_ALGORITHM == QT_ROTATION_TILED

template <class DST, class SRC>

Q_STATIC_TEMPLATE_FUNCTION inline void qt_memrotate90_tiled(const SRC *src, int w, int h,

                                        int sstride,

                                        DST *dest, int dstride)

{

    sstride /= sizeof(SRC);

    dstride /= sizeof(DST);

    const int pack = sizeof(quint32) / sizeof(DST);

    const int unaligned =

        qMin(uint((quintptr(dest) & (sizeof(quint32)-1)) / sizeof(DST)), uint(h));

    const int restX = w % tileSize;

    const int restY = (h - unaligned) % tileSize;

    const int unoptimizedY = restY % pack;

    const int numTilesX = w / tileSize + (restX > 0);

    const int numTilesY = (h - unaligned) / tileSize + (restY >= pack);

    for (int tx = 0; tx < numTilesX; ++tx) {

        const int startx = w - tx * tileSize - 1;

        const int stopx = qMax(startx - tileSize, 0);

        if (unaligned) {

            for (int x = startx; x >= stopx; --x) {

                DST *d = dest + (w - x - 1) * dstride;

                for (int y = 0; y < unaligned; ++y) {

                    *d++ = qt_colorConvert<DST,SRC>(src[y * sstride + x], 0);

                }

            }

        }

        for (int ty = 0; ty < numTilesY; ++ty) {

            const int starty = ty * tileSize + unaligned;

            const int stopy = qMin(starty + tileSize, h - unoptimizedY);

            for (int x = startx; x >= stopx; --x) {

                quint32 *d = reinterpret_cast<quint32*>(dest + (w - x - 1) * dstride + starty);

                for (int y = starty; y < stopy; y += pack) {

                    quint32 c = qt_colorConvert<DST,SRC>(src[y * sstride + x], 0);

                    for (int i = 1; i < pack; ++i) {

                        const int shift = (sizeof(int) * 8 / pack * i);

                        const DST color = qt_colorConvert<DST,SRC>(src[(y + i) * sstride + x], 0);

                        c |= color << shift;

                    }

                    *d++ = c;

                }

            }

        }

        if (unoptimizedY) {

            const int starty = h - unoptimizedY;

            for (int x = startx; x >= stopx; --x) {

                DST *d = dest + (w - x - 1) * dstride + starty;

                for (int y = starty; y < h; ++y) {

                    *d++ = qt_colorConvert<DST,SRC>(src[y * sstride + x], 0);

                }

            }

        }

    }

}

template <class DST, class SRC>

Q_STATIC_TEMPLATE_FUNCTION inline void qt_memrotate90_tiled_unpacked(const SRC *src, int w, int h,

                                                 int sstride,

                                                 DST *dest, int dstride)

{

    const int numTilesX = (w + tileSize - 1) / tileSize;

    const int numTilesY = (h + tileSize - 1) / tileSize;

    for (int tx = 0; tx < numTilesX; ++tx) {

        const int startx = w - tx * tileSize - 1;

        const int stopx = qMax(startx - tileSize, 0);

        for (int ty = 0; ty < numTilesY; ++ty) {

            const int starty = ty * tileSize;

            const int stopy = qMin(starty + tileSize, h);

            for (int x = startx; x >= stopx; --x) {

                DST *d = (DST*)((char*)dest + (w - x - 1) * dstride) + starty;

                const char *s = (const char*)(src + x) + starty * sstride;

                for (int y = starty; y < stopy; ++y) {

                    *d++ = qt_colorConvert<DST,SRC>(*(const SRC*)(s), 0);

                    s += sstride;

                }

            }

        }

    }

}

template <class DST, class SRC>

Q_STATIC_TEMPLATE_FUNCTION inline void qt_memrotate270_tiled(const SRC *src, int w, int h,

                                         int sstride,

                                         DST *dest, int dstride)

{

    sstride /= sizeof(SRC);

    dstride /= sizeof(DST);

    const int pack = sizeof(quint32) / sizeof(DST);

    const int unaligned =

        qMin(uint((long(dest) & (sizeof(quint32)-1)) / sizeof(DST)), uint(h));

    const int restX = w % tileSize;

    const int restY = (h - unaligned) % tileSize;

    const int unoptimizedY = restY % pack;

    const int numTilesX = w / tileSize + (restX > 0);

    const int numTilesY = (h - unaligned) / tileSize + (restY >= pack);

    for (int tx = 0; tx < numTilesX; ++tx) {

        const int startx = tx * tileSize;

        const int stopx = qMin(startx + tileSize, w);

        if (unaligned) {

            for (int x = startx; x < stopx; ++x) {

                DST *d = dest + x * dstride;

                for (int y = h - 1; y >= h - unaligned; --y) {

                    *d++ = qt_colorConvert<DST,SRC>(src[y * sstride + x], 0);

                }

            }

        }

        for (int ty = 0; ty < numTilesY; ++ty) {

            const int starty = h - 1 - unaligned - ty * tileSize;

            const int stopy = qMax(starty - tileSize, unoptimizedY);

            for (int x = startx; x < stopx; ++x) {

                quint32 *d = reinterpret_cast<quint32*>(dest + x * dstride

                                                        + h - 1 - starty);

                for (int y = starty; y > stopy; y -= pack) {

                    quint32 c = qt_colorConvert<DST,SRC>(src[y * sstride + x], 0);

                    for (int i = 1; i < pack; ++i) {

                        const int shift = (sizeof(int) * 8 / pack * i);

                        const DST color = qt_colorConvert<DST,SRC>(src[(y - i) * sstride + x], 0);

                        c |= color << shift;

                    }

                    *d++ = c;

                }

            }

        }

        if (unoptimizedY) {

            const int starty = unoptimizedY - 1;

            for (int x = startx; x < stopx; ++x) {

                DST *d = dest + x * dstride + h - 1 - starty;

                for (int y = starty; y >= 0; --y) {

                    *d++ = qt_colorConvert<DST,SRC>(src[y * sstride + x], 0);

                }

            }

        }

    }

}

template <class DST, class SRC>

Q_STATIC_TEMPLATE_FUNCTION inline void qt_memrotate270_tiled_unpacked(const SRC *src, int w, int h,

                                                  int sstride,

                                                  DST *dest, int dstride)

{

    const int numTilesX = (w + tileSize - 1) / tileSize;

    const int numTilesY = (h + tileSize - 1) / tileSize;

    for (int tx = 0; tx < numTilesX; ++tx) {

        const int startx = tx * tileSize;

        const int stopx = qMin(startx + tileSize, w);

        for (int ty = 0; ty < numTilesY; ++ty) {

            const int starty = h - 1 - ty * tileSize;

            const int stopy = qMax(starty - tileSize, 0);

            for (int x = startx; x < stopx; ++x) {

                DST *d = (DST*)((char*)dest + x * dstride) + h - 1 - starty;

                const char *s = (const char*)(src + x) + starty * sstride;

                for (int y = starty; y >= stopy; --y) {

                    *d++ = qt_colorConvert<DST,SRC>(*(const SRC*)s, 0);

                    s -= sstride;

                }

            }

        }

    }

}

#endif // QT_ROTATION_ALGORITHM

template <class DST, class SRC>

Q_STATIC_TEMPLATE_FUNCTION inline void qt_memrotate90_template(const SRC *src,

                                           int srcWidth, int srcHeight, int srcStride,

                                           DST *dest, int dstStride)

{

#if QT_ROTATION_ALGORITHM == QT_ROTATION_CACHEDREAD

    qt_memrotate90_cachedRead<DST,SRC>(src, srcWidth, srcHeight, srcStride,

                                       dest, dstStride);

#elif QT_ROTATION_ALGORITHM == QT_ROTATION_CACHEDWRITE

    qt_memrotate90_cachedWrite<DST,SRC>(src, srcWidth, srcHeight, srcStride,

                                        dest, dstStride);

#elif QT_ROTATION_ALGORITHM == QT_ROTATION_PACKING

    qt_memrotate90_packing<DST,SRC>(src, srcWidth, srcHeight, srcStride,

                                    dest, dstStride);

#elif QT_ROTATION_ALGORITHM == QT_ROTATION_TILED

    qt_memrotate90_tiled<DST,SRC>(src, srcWidth, srcHeight, srcStride,

                                  dest, dstStride);

#endif

}

template <class DST, class SRC>

Q_STATIC_TEMPLATE_FUNCTION inline void qt_memrotate180_template(const SRC *src,

                                            int w, int h, int sstride,

                                            DST *dest, int dstride)

{

    const char *s = (const char*)(src) + (h - 1) * sstride;

    for (int y = h - 1; y >= 0; --y) {

        DST *d = reinterpret_cast<DST*>((char *)(dest) + (h - y - 1) * dstride);

        src = reinterpret_cast<const SRC*>(s);

        for (int x = w - 1; x >= 0; --x) {

            d[w - x - 1] = qt_colorConvert<DST,SRC>(src[x], 0);

        }

        s -= sstride;

    }

}

template <class DST, class SRC>

Q_STATIC_TEMPLATE_FUNCTION inline void qt_memrotate270_template(const SRC *src,

                                            int srcWidth, int srcHeight, int srcStride,

                                            DST *dest, int dstStride)

{

#if QT_ROTATION_ALGORITHM == QT_ROTATION_CACHEDREAD

    qt_memrotate270_cachedRead<DST,SRC>(src, srcWidth, srcHeight, srcStride,

                                        dest, dstStride);

#elif QT_ROTATION_ALGORITHM == QT_ROTATION_CACHEDWRITE

    qt_memrotate270_cachedWrite<DST,SRC>(src, srcWidth, srcHeight, srcStride,

                                         dest, dstStride);

#elif QT_ROTATION_ALGORITHM == QT_ROTATION_PACKING

    qt_memrotate270_packing<DST,SRC>(src, srcWidth, srcHeight, srcStride,

                                     dest, dstStride);

#elif QT_ROTATION_ALGORITHM == QT_ROTATION_TILED

    qt_memrotate270_tiled_unpacked<DST,SRC>(src, srcWidth, srcHeight,

                                            srcStride,

                                            dest, dstStride);

#endif

}

template <>

Q_STATIC_TEMPLATE_SPECIALIZATION

inline void qt_memrotate90_template<quint24, quint24>(const quint24 *src,

                                                             int srcWidth, int srcHeight, int srcStride,

                                                             quint24 *dest, int dstStride)

{

#if QT_ROTATION_ALGORITHM == QT_ROTATION_CACHEDREAD

    qt_memrotate90_cachedRead<quint24,quint24>(src, srcWidth, srcHeight,

                                               srcStride, dest, dstStride);

#elif QT_ROTATION_ALGORITHM == QT_ROTATION_CACHEDWRITE

    qt_memrotate90_cachedWrite<quint24,quint24>(src, srcWidth, srcHeight,

                                                srcStride, dest, dstStride);

#elif QT_ROTATION_ALGORITHM == QT_ROTATION_PACKING

    // packed algorithm not implemented

    qt_memrotate90_cachedRead<quint24,quint24>(src, srcWidth, srcHeight,

                                               srcStride, dest, dstStride);

#elif QT_ROTATION_ALGORITHM == QT_ROTATION_TILED

    // packed algorithm not implemented

    qt_memrotate90_tiled_unpacked<quint24,quint24>(src, srcWidth, srcHeight,

                                                   srcStride, dest, dstStride);

#endif

}

template <>

Q_STATIC_TEMPLATE_SPECIALIZATION

inline void qt_memrotate90_template<quint24, quint32>(const quint32 *src,

                                                             int srcWidth, int srcHeight, int srcStride,

                                                             quint24 *dest, int dstStride)

{

#if QT_ROTATION_ALGORITHM == QT_ROTATION_CACHEDREAD

    qt_memrotate90_cachedRead<quint24,quint32>(src, srcWidth, srcHeight,

                                               srcStride, dest, dstStride);

#elif QT_ROTATION_ALGORITHM == QT_ROTATION_CACHEDWRITE

    qt_memrotate90_cachedWrite<quint24,quint32>(src, srcWidth, srcHeight,

                                                srcStride, dest, dstStride);

#elif QT_ROTATION_ALGORITHM == QT_ROTATION_PACKING

    // packed algorithm not implemented

    qt_memrotate90_cachedRead<quint24,quint32>(src, srcWidth, srcHeight,

                                               srcStride, dest, dstStride);

#elif QT_ROTATION_ALGORITHM == QT_ROTATION_TILED

    // packed algorithm not implemented

    qt_memrotate90_tiled_unpacked<quint24,quint32>(src, srcWidth, srcHeight,

                                                   srcStride, dest, dstStride);

#endif

}

template <>

Q_STATIC_TEMPLATE_SPECIALIZATION

inline void qt_memrotate90_template<quint18, quint32>(const quint32 *src,

                                                             int srcWidth, int srcHeight, int srcStride,

                                                             quint18 *dest, int dstStride)

{

#if QT_ROTATION_ALGORITHM == QT_ROTATION_CACHEDREAD

    qt_memrotate90_cachedRead<quint18,quint32>(src, srcWidth, srcHeight,

                                               srcStride, dest, dstStride);

#elif QT_ROTATION_ALGORITHM == QT_ROTATION_CACHEDWRITE

    qt_memrotate90_cachedWrite<quint18,quint32>(src, srcWidth, srcHeight,

                                                srcStride, dest, dstStride);

#elif QT_ROTATION_ALGORITHM == QT_ROTATION_PACKING

    // packed algorithm not implemented

    qt_memrotate90_cachedRead<quint18,quint32>(src, srcWidth, srcHeight,

                                               srcStride, dest, dstStride);

#elif QT_ROTATION_ALGORITHM == QT_ROTATION_TILED

    // packed algorithm not implemented

    qt_memrotate90_tiled_unpacked<quint18,quint32>(src, srcWidth, srcHeight,

                                                   srcStride, dest, dstStride);

#endif

}

#define QT_IMPL_MEMROTATE(srctype, desttype)                        \

void qt_memrotate90(const srctype *src, int w, int h, int sstride,  \

                    desttype *dest, int dstride)                    \

{                                                                   \

    qt_memrotate90_template(src, w, h, sstride, dest, dstride);     \

}                                                                   \

void qt_memrotate180(const srctype *src, int w, int h, int sstride, \

                     desttype *dest, int dstride)                   \

{                                                                   \

    qt_memrotate180_template(src, w, h, sstride, dest, dstride);    \

}                                                                   \

void qt_memrotate270(const srctype *src, int w, int h, int sstride, \

                     desttype *dest, int dstride)                   \

{                                                                   \

    qt_memrotate270_template(src, w, h, sstride, dest, dstride);    \

}