katie/src/gui/painting/qmemrotate.cpp

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#include "qmemrotate_p.h"

QT_BEGIN_NAMESPACE

#if QT_ROTATION_ALGORITHM == QT_ROTATION_CACHEDREAD
template <class DST, class SRC>
static 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] = src[x];
        }
        s += sstride;
        src = reinterpret_cast<const SRC*>(s);
    }
}

template <class DST, class SRC>
static 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] = src[x];
        }
        s -= sstride;
    }
}
#elif QT_ROTATION_ALGORITHM == QT_ROTATION_CACHEDWRITE
template <class DST, class SRC>
static 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++ = src[y * sstride + x];
        }
    }

}

template <class DST, class SRC>
static 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++ = src[y * sstride + x];
        }
    }
}
#endif // QT_ROTATION_ALGORITHM

template <class DST, class SRC>
static 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);
#endif
}

template <class DST, class SRC>
static 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] = src[x];
        }
        s -= sstride;
    }
}

template <class DST, class SRC>
static 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);
#endif
}

template <>
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);
#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);    \
}

QT_IMPL_MEMROTATE(quint8, quint8)
QT_IMPL_MEMROTATE(quint16, quint16)
QT_IMPL_MEMROTATE(quint24, quint24)
QT_IMPL_MEMROTATE(quint32, quint32)

#undef QT_IMPL_MEMROTATE

QT_END_NAMESPACE