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Small speedup for cover browser

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This commit is contained in:
Kovid Goyal 2016-05-12 23:54:40 +05:30
parent dc0942b6f8
commit 058a58b179
1 changed files with 21 additions and 14 deletions
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35
src/calibre/gui2/pictureflow/pictureflow.cpp
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@ -603,10 +603,18 @@ void PictureFlowPrivate::resetSlides()
}
}
static QImage prepareSurface(QImage srcimg, int w, int h, bool doReflections, bool preserveAspectRatio)
static inline quint16 qConvertRgb32To16(uint c)
{
return (((c) >> 3) & 0x001f)
| (((c) >> 5) & 0x07e0)
| (((c) >> 8) & 0xf800);
}
static QImage prepareSurface(QImage srcimg, const int w, const int h, bool doReflections, bool preserveAspectRatio)
{
// slightly larger, to accommodate for the reflection
int hs = int(h * REFLECTION_FACTOR), left = 0, top = 0, a = 0, r = 0, g = 0, b = 0, ht, x, y, bpp;
int hs = int(h * REFLECTION_FACTOR), left = 0, top = 0, ht, x, y, bpp;
double alpha = 0;
QImage img = (preserveAspectRatio) ? QImage(w, h, srcimg.format()) : srcimg.scaled(w, h, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
QRgb color;
@ -634,23 +642,22 @@ static QImage prepareSurface(QImage srcimg, int w, int h, bool doReflections, bo
// transpose the image, this is to speed-up the rendering
// because we process one column at a time
// (and much better and faster to work row-wise, i.e in one scanline)
for(x = 0; x < w; x++)
for(y = 0; y < h; y++)
result.setPixel(y, x, img.pixel(x, y));
for(x = 0; x < w; x++) {
quint16* line = reinterpret_cast<quint16*>(result.scanLine(x));
for(y = 0; y < h; y++) {
line[y] = qConvertRgb32To16(img.pixel(x, y));
}
}
if (doReflections) {
// create the reflection
ht = hs - h;
for(x = 0; x < w; x++) {
for(y = 0; y < ht; y++)
{
color = img.pixel(x, img.height()-y-1);
//QRgb565 color = img.scanLine(img.height()-y-1) + x*sizeof(QRgb565); //img.pixel(x, img.height()-y-1);
a = qAlpha(color);
r = qRed(color) * a / 256 * (ht - y) / ht * 3/5;
g = qGreen(color) * a / 256 * (ht - y) / ht * 3/5;
b = qBlue(color) * a / 256 * (ht - y) / ht * 3/5;
result.setPixel(h+y, x, qRgb(r, g, b));
quint16* line = reinterpret_cast<quint16*>(result.scanLine(x));
for(y = 0; y < ht; y++) {
color = img.pixel(x, h-y-1);
alpha = (qAlpha(color) / 256.0) * ((ht - y) / (double)ht * 3/5.0);
line[h+y] = qConvertRgb32To16(qRgb(qRed(color)*alpha, qGreen(color)*alpha, qBlue(color)*alpha));
}
}
}