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Scale background image before applying (CPU expensive) opacity filter on it, if the scaled image will be smaller than the original one

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This commit is contained in:
Arnaud Bienner 2012-03-08 22:25:29 +01:00
parent c2a4ca2cf8
commit b00bdcf04e
1 changed files with 25 additions and 5 deletions
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30
src/playlist/playlistview.cpp
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@ -807,10 +807,24 @@ void PlaylistView::paintEvent(QPaintEvent* event) {
if (background_image_type_ == Custom || background_image_type_ == AlbumCover) {
if (!background_image_.isNull()) {
QPainter background_painter(viewport());
// Check if we should recompute the background image
if (height() != last_height_ || width() != last_width_
|| force_background_redraw_) {
QImage background_image(background_image_);
bool background_image_has_been_scaled = false;
// If the background image is bigger than playlistview, scale it first,
// before applying opacity filter, to reduce CPU usage
if (background_image.height() > height()) {
background_image = background_image.scaled(
width(), height(),
Qt::KeepAspectRatioByExpanding,
Qt::SmoothTransformation);
background_image_has_been_scaled = true;
}
// Apply opacity filter
uchar* bits = background_image.bits();
for (int i = 0; i < background_image.height() * background_image.bytesPerLine(); ++i) {
bits[i] = qBound(
@ -818,17 +832,23 @@ void PlaylistView::paintEvent(QPaintEvent* event) {
static_cast<int>(bits[i] + kBackgroundOpacity * 255),
255);
}
// Scale image if this wasn't done before
if (!background_image_has_been_scaled) {
background_image = background_image.scaled(
width(), height(),
Qt::KeepAspectRatioByExpanding,
Qt::SmoothTransformation);
}
cached_scaled_background_image_ = QPixmap::fromImage(
background_image.scaled(
width(), height(),
Qt::KeepAspectRatioByExpanding,
Qt::SmoothTransformation));
cached_scaled_background_image_ = QPixmap::fromImage(background_image);
last_height_ = height();
last_width_ = width();
force_background_redraw_ = false;
}
// Actually draw the background image
background_painter.drawPixmap((width() - cached_scaled_background_image_.width()) / 2,
(height() - cached_scaled_background_image_.height()) / 2,
cached_scaled_background_image_);