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Add support for RLE-compressed, 16 bits per channel PSD files.

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This commit is contained in:
Chris Xiong
2020-11-06 15:02:29 +08:00
parent b742cb7cc7
commit 5825c83235
2 changed files with 58 additions and 8 deletions
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31
src/imageformats/psd.cpp
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@ -165,6 +165,14 @@ static bool LoadPSD(QDataStream &stream, const PSDHeader &header, QImage &img)
// Ignore the other channels.
channel_num = 4;
}
if (compression == 1 && header.depth == 16) {
fmt = QImage::Format_RGBX64;
if (channel_num >= 4) {
fmt = QImage::Format_RGBA64;
}
}
img = QImage(header.width, header.height, fmt);
if (img.isNull()) {
qWarning() << "Failed to allocate image, invalid dimensions?" << QSize(header.width, header.height);
@ -193,11 +201,15 @@ static bool LoadPSD(QDataStream &stream, const PSDHeader &header, QImage &img)
updateAlpha
};
typedef QRgba64(*channelUpdater16)(QRgba64, quint16);
static const channelUpdater16 updaters64[4] = {
[](QRgba64 oldPixel, quint16 redPixel) {return qRgba64((oldPixel & ~(0xFFFFull << 0)) | (quint64( redPixel) << 0));},
[](QRgba64 oldPixel, quint16 greenPixel){return qRgba64((oldPixel & ~(0xFFFFull << 16)) | (quint64(greenPixel) << 16));},
[](QRgba64 oldPixel, quint16 bluePixel) {return qRgba64((oldPixel & ~(0xFFFFull << 32)) | (quint64( bluePixel) << 32));},
[](QRgba64 oldPixel, quint16 alphaPixel){return qRgba64((oldPixel & ~(0xFFFFull << 48)) | (quint64(alphaPixel) << 48));}
};
if (compression) {
if (header.depth != 8) {
qWarning() << "RLE compressed PSD image with depth != 8 is not supported.";
return false;
}
// Skip row lengths.
int skip_count = header.height * header.channel_count * sizeof(quint16);
if (stream.skipRawData(skip_count) != skip_count) {
@ -205,9 +217,18 @@ static bool LoadPSD(QDataStream &stream, const PSDHeader &header, QImage &img)
}
for (unsigned short channel = 0; channel < channel_num; channel++) {
bool success = decodeRLEData(RLEVariant::PackBits, stream,
bool success = false;
if (header.depth == 8) {
success = decodeRLEData(RLEVariant::PackBits, stream,
image_data, pixel_count,
&readPixel_u8, updaters[channel]);
} else if (header.depth == 16) {
QRgba64 *image_data = reinterpret_cast<QRgba64*>(img.bits());
success = decodeRLEData(RLEVariant::PackBits16, stream,
image_data, pixel_count * 2,
&readPixel_u8, updaters64[channel]);
}
if (!success) {
qDebug() << "decodeRLEData on channel" << channel << "failed";
return false;