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Save memcpy when converting to 32bit formats

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If the destination format is 32bit, we can convert directly in the
destination instead of in a buffer.

Change-Id: I2b4407da77b863deec7869c341e1a8d464b46600
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>
This commit is contained in:
Allan Sandfeld Jensen 2016-03-20 15:35:23 +01:00 committed by Allan Sandfeld Jensen
parent b69ac5a0af
commit 31c251765d
1 changed files with 9 additions and 3 deletions
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12
src/gui/image/qimage_conversions.cpp
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@ -134,7 +134,8 @@ void convert_generic(QImageData *dest, const QImageData *src, Qt::ImageConversio
Q_ASSERT(dest->format > QImage::Format_Indexed8);
Q_ASSERT(src->format > QImage::Format_Indexed8);
const int buffer_size = 2048;
uint buffer[buffer_size];
uint buf[buffer_size];
uint *buffer = buf;
const QPixelLayout *srcLayout = &qPixelLayouts[src->format];
const QPixelLayout *destLayout = &qPixelLayouts[dest->format];
const uchar *srcData = src->data;
@ -169,11 +170,16 @@ void convert_generic(QImageData *dest, const QImageData *src, Qt::ImageConversio
int x = 0;
while (x < src->width) {
dither.x = x;
int l = qMin(src->width - x, buffer_size);
int l = src->width - x;
if (destLayout->bpp == QPixelLayout::BPP32)
buffer = reinterpret_cast<uint *>(destData) + x;
else
l = qMin(l, buffer_size);
const uint *ptr = fetch(buffer, srcData, x, l);
ptr = convertToARGB32PM(buffer, ptr, l, 0, ditherPtr);
ptr = convertFromARGB32PM(buffer, ptr, l, 0, ditherPtr);
store(destData, ptr, x, l);
if (ptr != reinterpret_cast<uint *>(destData))
store(destData, ptr, x, l);
x += l;
}
srcData += src->bytes_per_line;