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ScanlineConverter: fix indexed conversion and support for source depth less than 24 bits

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This commit is contained in:
Mirco Miranda 2024-01-06 09:04:06 +01:00
parent f065104b72
commit 9f7b1b8dee
3 changed files with 8 additions and 6 deletions
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14
src/imageformats/scanlineconverter.cpp
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@ -60,20 +60,25 @@ const uchar *ScanLineConverter::convertedScanLine(const QImage &image, qint32 y)
}
if (image.width() != _tmpBuffer.width() || image.format() != _tmpBuffer.format()) {
_tmpBuffer = QImage(image.width(), 1, image.format());
_tmpBuffer.setColorTable(image.colorTable());
}
if (_tmpBuffer.isNull()) {
return nullptr;
}
std::memcpy(_tmpBuffer.bits(), image.constScanLine(y), std::min(_tmpBuffer.bytesPerLine(), image.bytesPerLine()));
auto tmp = _tmpBuffer;
if (colorSpaceConversion) {
auto cs = image.colorSpace();
if (!cs.isValid()) {
cs = _defaultColorSpace;
}
_tmpBuffer.setColorSpace(cs);
_tmpBuffer.convertToColorSpace(_colorSpace);
if (tmp.depth() < 24) {
tmp = tmp.convertToFormat(tmp.hasAlphaChannel() ? QImage::Format_ARGB32 : QImage::Format_RGB32);
}
_convBuffer = _tmpBuffer.convertToFormat(_targetFormat);
tmp.setColorSpace(cs);
tmp.convertToColorSpace(_colorSpace);
}
_convBuffer = tmp.convertToFormat(_targetFormat);
if (_convBuffer.isNull()) {
return nullptr;
}
@ -90,9 +95,6 @@ qsizetype ScanLineConverter::bytesPerLine() const
bool ScanLineConverter::isColorSpaceConversionNeeded(const QImage &image, const QColorSpace &targetColorSpace, const QColorSpace &defaultColorSpace)
{
if (image.depth() < 24) { // RGB 8 bit or grater only
return false;
}
auto sourceColorSpace = image.colorSpace();
if (!sourceColorSpace.isValid()) {
sourceColorSpace = defaultColorSpace;