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Optimize the drawning of blur text.

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Drawing the blur text takes 65% of the time while changing desktop on my desktop
(40 opened windows)

QImage::width() and QImage::height() are not inline, do not call them on a tight
loop or they consume 10% of the time.

Reviewed by Alexis



svn path=/trunk/KDE/kdelibs/; revision=1020918
This commit is contained in:
Olivier Goffart 2009-09-07 15:27:36 +00:00
parent 4fdea87216
commit 705b930ca3
1 changed files with 11 additions and 6 deletions
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17
private/effects/blur.cpp
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@ -60,11 +60,13 @@ void expblur(QImage &img, int radius)
*/
int alpha = (int)((1 << aprec) * (1.0f - std::exp(-2.3f / (radius + 1.f))));
for (int row=0; row<img.height(); row++) {
int height = img.height();
int width = img.width();
for (int row=0; row<height; row++) {
blurrow<aprec,zprec>(img, row, alpha);
}
for (int col=0; col<img.width(); col++) {
for (int col=0; col<width; col++) {
blurcol<aprec,zprec>(img, col, alpha);
}
return;
@ -96,16 +98,17 @@ static inline void blurrow(QImage &im, int line, int alpha)
int zR, zG, zB, zA;
QRgb *ptr = (QRgb *)im.scanLine(line);
int width = im.width();
zR = *((unsigned char *)ptr ) << zprec;
zG = *((unsigned char *)ptr + 1) << zprec;
zB = *((unsigned char *)ptr + 2) << zprec;
zA = *((unsigned char *)ptr + 3) << zprec;
for (int index=1; index<im.width(); index++) {
for (int index=1; index<width; index++) {
blurinner<aprec,zprec>((unsigned char *)&ptr[index],zR,zG,zB,zA,alpha);
}
for (int index=im.width()-2; index>=0; index--) {
for (int index=width-2; index>=0; index--) {
blurinner<aprec,zprec>((unsigned char *)&ptr[index],zR,zG,zB,zA,alpha);
}
}
@ -117,17 +120,19 @@ static inline void blurcol(QImage &im, int col, int alpha)
QRgb *ptr = (QRgb *)im.bits();
ptr += col;
int height = im.height();
int width = im.width();
zR = *((unsigned char *)ptr ) << zprec;
zG = *((unsigned char *)ptr + 1) << zprec;
zB = *((unsigned char *)ptr + 2) << zprec;
zA = *((unsigned char *)ptr + 3) << zprec;
for (int index=im.width(); index<(im.height()-1)*im.width(); index+=im.width()) {
for (int index=width; index<(height-1)*width; index+=width) {
blurinner<aprec,zprec>((unsigned char *)&ptr[index], zR, zG, zB, zA, alpha);
}
for (int index=(im.height()-2)*im.width(); index>=0; index-=im.width()) {
for (int index=(height-2)*width; index>=0; index-=width) {
blurinner<aprec,zprec>((unsigned char *)&ptr[index], zR, zG, zB, zA, alpha);
}
}