void DisplayImageConverter::convertImages(const QImage & a, const QImage & b)
{
//allocate image if it isn't
if (m_previewImage.isNull() || m_previewImage.size() != a.size())
{
m_previewImage = QImage(a.size(), a.format());
}
//composite images
QPainter painter(&m_previewImage);
painter.setCompositionMode(QPainter::CompositionMode_Source);
painter.fillRect(m_previewImage.rect(), Qt::black);
qreal alphaB = crossFadeValue.normalizedValue();
qreal alphaA = 1.0 - alphaB;
if (alphaA <= alphaB)
{
painter.drawImage(0, 0, a);
painter.setCompositionMode(QPainter::CompositionMode_SourceOver);
painter.setOpacity(alphaB);
painter.drawImage(0, 0, b);
}
else
{
painter.drawImage(0, 0, b);
painter.setCompositionMode(QPainter::CompositionMode_SourceOver);
painter.setOpacity(alphaA);
painter.drawImage(0, 0, a);
}
//scale image down to real size
m_displayImage = m_previewImage.scaled(displayWidth, displayHeight, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
//do image correction
float brightness = displayBrightness / 50.0f;
float contrast = (displayContrast + 50.0f) / 100.0f * 2.0f;
float gamma = displayGamma / 220.0f;
m_displayImage = changeImage(m_displayImage, brightness, contrast, gamma);
//send results
displayImageChanged(m_displayImage);
previewImageChanged(m_previewImage);
}
void PosteRazorCore::createPreviewImage(const QSize &size) const
{
const QImage previewImage = m_imageLoader->imageAsRGB(inputImagePreviewSize(size).toSize());
emit previewImageChanged(previewImage);
}
