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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
View File

@ -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;

35
src/imageformats/rle_p.h
View File

@ -24,6 +24,11 @@ enum class RLEVariant {
* of size 2, 130 of size 3, up to 255 of size 128.
*/
PackBits,
/**
* Same as PackBits, but treat unpacked data as
* 16-bit integers.
*/
PackBits16,
/**
* PIC-style RLE
*
@ -67,6 +72,8 @@ static inline bool decodeRLEData(RLEVariant variant,
Func2 updateItem)
{
unsigned offset = 0; // in dest
bool is_msb = true; // only used for 16-bit PackBits, data is big-endian
quint16 temp_data = 0;
while (offset < length) {
unsigned remaining = length - offset;
quint8 count1;
@ -85,7 +92,7 @@ static inline bool decodeRLEData(RLEVariant variant,
// 2 to 128 repetitions
length = count1 - 127u;
}
} else if (variant == RLEVariant::PackBits) {
} else if (variant == RLEVariant::PackBits || variant == RLEVariant::PackBits16) {
if (count1 == 128u) {
// Ignore value 128
continue;
@ -102,7 +109,18 @@ static inline bool decodeRLEData(RLEVariant variant,
}
auto datum = readData(stream);
for (unsigned i = offset; i < offset + length; ++i) {
dest[i] = updateItem(dest[i], datum);
if (variant == RLEVariant::PackBits16) {
if (is_msb) {
temp_data = datum << 8;
is_msb = false;
} else {
temp_data |= datum;
dest[i >> 1] = updateItem(dest[i >> 1], temp_data);
is_msb = true;
}
} else {
dest[i] = updateItem(dest[i], datum);
}
}
offset += length;
} else {
@ -114,7 +132,18 @@ static inline bool decodeRLEData(RLEVariant variant,
}
for (unsigned i = offset; i < offset + length; ++i) {
auto datum = readData(stream);
dest[i] = updateItem(dest[i], datum);
if (variant == RLEVariant::PackBits16) {
if (is_msb) {
temp_data = datum << 8;
is_msb = false;
} else {
temp_data |= datum;
dest[i >> 1] = updateItem(dest[i >> 1], temp_data);
is_msb = true;
}
} else {
dest[i] = updateItem(dest[i], datum);
}
}
offset += length;
}