diff options
| -rw-r--r-- | src/gui/image/qimage.cpp | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/src/gui/image/qimage.cpp b/src/gui/image/qimage.cpp index e1da0ffffc..8bbcfa612d 100644 --- a/src/gui/image/qimage.cpp +++ b/src/gui/image/qimage.cpp @@ -3014,6 +3014,37 @@ template<class T> inline void do_mirror_data(QImageData *dst, QImageData *src, } } +inline void do_flip(QImageData *dst, QImageData *src, int w, int h, int depth) +{ + const int data_bytes_per_line = w * (depth / 8); + if (dst == src) { + uint *srcPtr = reinterpret_cast<uint *>(src->data); + uint *dstPtr = reinterpret_cast<uint *>(dst->data + (h - 1) * dst->bytes_per_line); + h = h / 2; + const int uint_per_line = (data_bytes_per_line + 3) >> 2; // bytes per line must be a multiple of 4 + for (int y = 0; y < h; ++y) { + // This is auto-vectorized, no need for SSE2 or NEON versions: + for (int x = 0; x < uint_per_line; x++) { + const uint d = dstPtr[x]; + const uint s = srcPtr[x]; + dstPtr[x] = s; + srcPtr[x] = d; + } + srcPtr += src->bytes_per_line >> 2; + dstPtr -= dst->bytes_per_line >> 2; + } + + } else { + const uchar *srcPtr = src->data; + uchar *dstPtr = dst->data + (h - 1) * dst->bytes_per_line; + for (int y = 0; y < h; ++y) { + memcpy(dstPtr, srcPtr, data_bytes_per_line); + srcPtr += src->bytes_per_line; + dstPtr -= dst->bytes_per_line; + } + } +} + inline void do_mirror(QImageData *dst, QImageData *src, bool horizontal, bool vertical) { Q_ASSERT(src->width == dst->width && src->height == dst->height && src->depth == dst->depth); @@ -3026,6 +3057,12 @@ inline void do_mirror(QImageData *dst, QImageData *src, bool horizontal, bool ve depth = 8; } + if (vertical && !horizontal) { + // This one is simple and common, so do it a little more optimized + do_flip(dst, src, w, h, depth); + return; + } + int dstX0 = 0, dstXIncr = 1; int dstY0 = 0, dstYIncr = 1; if (horizontal) { |