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Merge pull request #62405 from qgis/backport-62390-to-release-3_44

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[Backport release-3_44] Optimise QgsHueSaturationFilter
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Alexander Bruy 2025-06-25 05:52:08 +01:00 committed by GitHub
commit 33ee1d76c1
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GPG Key ID: B5690EEEBB952194
1 changed files with 78 additions and 65 deletions
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143
src/core/raster/qgshuesaturationfilter.cpp
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@ -113,10 +113,9 @@ QgsRasterBlock *QgsHueSaturationFilter::block( int bandNo, QgsRectangle const &
Q_UNUSED( bandNo )
QgsDebugMsgLevel( QStringLiteral( "width = %1 height = %2 extent = %3" ).arg( width ).arg( height ).arg( extent.toString() ), 4 );
auto outputBlock = std::make_unique<QgsRasterBlock>();
if ( !mInput )
{
return outputBlock.release();
return nullptr;
}
// At this moment we know that we read rendered image
@ -125,7 +124,7 @@ QgsRasterBlock *QgsHueSaturationFilter::block( int bandNo, QgsRectangle const &
if ( !inputBlock || inputBlock->isEmpty() )
{
QgsDebugError( QStringLiteral( "No raster data!" ) );
return outputBlock.release();
return nullptr;
}
if ( !mInvertColors && mSaturation == 0 && mGrayscaleMode == GrayscaleOff && !mColorizeOn )
@ -134,87 +133,101 @@ QgsRasterBlock *QgsHueSaturationFilter::block( int bandNo, QgsRectangle const &
return inputBlock.release();
}
auto outputBlock = std::make_unique<QgsRasterBlock>();
if ( !outputBlock->reset( Qgis::DataType::ARGB32_Premultiplied, width, height ) )
{
return outputBlock.release();
return nullptr;
}
// adjust image
QRgb myNoDataColor = qRgba( 0, 0, 0, 0 );
QRgb myRgb;
QColor myColor;
const QRgb myNoDataColor = qRgba( 0, 0, 0, 0 );
int h, s, l;
int r, g, b, alpha;
int r, g, b;
double alphaFactor = 1.0;
for ( qgssize i = 0; i < ( qgssize )width * height; i++ )
const QRgb *inputColorData = inputBlock->colorData();
const int imageHeight = inputBlock->image().height();
const int imageWidth = inputBlock->image().width();
QRgb *outputColorData = outputBlock->colorData();
for ( int row = 0; row < height; ++row )
{
if ( inputBlock->color( i ) == myNoDataColor )
if ( feedback->isCanceled() )
return nullptr;
for ( int col = 0; col < width; ++col )
{
outputBlock->setColor( i, myNoDataColor );
continue;
}
const qgssize i = static_cast< qgssize >( row ) * width + static_cast< qgssize >( col );
myRgb = inputBlock->color( i );
myColor = QColor( myRgb );
if ( !inputColorData || row >= imageHeight || col >= imageWidth || inputColorData[i] == myNoDataColor )
{
outputColorData[i] = myNoDataColor;
continue;
}
// Alpha must be taken from QRgb, since conversion from QRgb->QColor loses alpha
alpha = qAlpha( myRgb );
const QRgb inputColor = inputColorData[i];
QColor myColor = QColor( inputColor );
if ( alpha == 0 )
{
// totally transparent, no changes required
outputBlock->setColor( i, myRgb );
continue;
}
// Alpha must be taken from QRgb, since conversion from QRgb->QColor loses alpha
const int alpha = qAlpha( inputColor );
// Get rgb for color
myColor.getRgb( &r, &g, &b );
if ( alpha == 0 )
{
// totally transparent, no changes required
outputColorData[i] = inputColor;
continue;
}
if ( mInvertColors || alpha != 255 )
{
// Get rgb for color
myColor.getRgb( &r, &g, &b );
if ( mInvertColors || alpha != 255 )
{
if ( alpha != 255 )
{
// Semi-transparent pixel. We need to adjust the colors since we are using Qgis::DataType::ARGB32_Premultiplied
// and color values have been premultiplied by alpha
alphaFactor = alpha / 255.;
r /= alphaFactor;
g /= alphaFactor;
b /= alphaFactor;
}
if ( mInvertColors )
{
r = 255 - r;
g = 255 - g;
b = 255 - b;
}
myColor = QColor::fromRgb( r, g, b );
}
myColor.getHsl( &h, &s, &l );
// Changing saturation?
if ( ( mGrayscaleMode != GrayscaleOff ) || ( mSaturationScale != 1 ) )
{
processSaturation( r, g, b, h, s, l );
}
// Colorizing?
if ( mColorizeOn )
{
processColorization( r, g, b, h, s, l );
}
// Convert back to rgb
if ( alpha != 255 )
{
// Semi-transparent pixel. We need to adjust the colors since we are using Qgis::DataType::ARGB32_Premultiplied
// and color values have been premultiplied by alpha
alphaFactor = alpha / 255.;
r /= alphaFactor;
g /= alphaFactor;
b /= alphaFactor;
// Transparent pixel, need to premultiply color components
r *= alphaFactor;
g *= alphaFactor;
b *= alphaFactor;
}
if ( mInvertColors )
{
r = 255 - r;
g = 255 - g;
b = 255 - b;
}
myColor = QColor::fromRgb( r, g, b );
outputColorData[i] = qRgba( r, g, b, alpha );
}
myColor.getHsl( &h, &s, &l );
// Changing saturation?
if ( ( mGrayscaleMode != GrayscaleOff ) || ( mSaturationScale != 1 ) )
{
processSaturation( r, g, b, h, s, l );
}
// Colorizing?
if ( mColorizeOn )
{
processColorization( r, g, b, h, s, l );
}
// Convert back to rgb
if ( alpha != 255 )
{
// Transparent pixel, need to premultiply color components
r *= alphaFactor;
g *= alphaFactor;
b *= alphaFactor;
}
outputBlock->setColor( i, qRgba( r, g, b, alpha ) );
}
return outputBlock.release();