#include <psd_header.h>

Public Member Functions
	PSDHeader ()

bool	read (QIODevice &device)

bool	valid ()

bool	write (QIODevice &device)

Public Attributes
psd_byte_order	byteOrder

quint16	channelDepth

psd_color_mode	colormode

QString	error

quint32	height

quint16	nChannels

QString	signature

bool	tiffStyleLayerBlock

quint16	version

quint32	width

Detailed Description

Definition at line 18 of file psd_header.h.

Constructor & Destructor Documentation

◆ PSDHeader()

PSDHeader::PSDHeader ( )

Definition at line 24 of file psd_header.cpp.

    : version(0)
    , nChannels(0)
    , height(0)
    , width(0)
    , channelDepth(0)
    , colormode(COLORMODE_UNKNOWN)
    , byteOrder(psd_byte_order::psdBigEndian)
    , tiffStyleLayerBlock(false)
{
}

Member Function Documentation

◆ read()

bool PSDHeader::read ( QIODevice & device )

Reads a psd header from the given device.

Returns: false if: reading failed if the 8BPS signature is not found if the version is not 1 or 2

Definition at line 36 of file psd_header.cpp.

{
    Header header;
    quint64 bytesRead = device.read((char *)&header, sizeof(Header));
    if (bytesRead != sizeof(Header)) {
        error = "Could not read header: not enough bytes";
        return false;
    }
 
    signature = QString(header.signature);
    memcpy(&version, header.version, 2);
    version = qFromBigEndian(version);
    memcpy(&nChannels, header.nChannels, 2);
    nChannels = qFromBigEndian(nChannels);
    memcpy(&height, header.height, 4);
    height = qFromBigEndian(height);
    memcpy(&width, header.width, 4);
    width = qFromBigEndian(width);
    memcpy(&channelDepth, header.channelDepth, 2);
    channelDepth = qFromBigEndian(channelDepth);
    memcpy(&colormode, header.colormode, 2);
    colormode = (psd_color_mode)qFromBigEndian((quint16)colormode);
 
    return valid();
}

References Header::channelDepth, channelDepth, Header::colormode, colormode, error, Header::height, height, Header::nChannels, nChannels, Header::signature, signature, valid(), Header::version, version, Header::width, and width.

◆ valid()

bool PSDHeader::valid ( )

Definition at line 85 of file psd_header.cpp.

{
    if (signature != "8BPS") {
        error = "Not a PhotoShop document. Signature is: " + signature;
        return false;
    }
    if (version < 1 || version > 2) {
        error = QString("Wrong version: %1").arg(version);
        return false;
    }
    if (nChannels < 1 || nChannels > 56) {
        error = QString("Channel count out of range: %1").arg(nChannels);
        return false;
    }
    if (version == 1) {
        if (height < 1 || height > 30000) {
            error = QString("Height out of range: %1").arg(height);
            return false;
        }
        if (width < 1 || width > 30000) {
            error = QString("Width out of range: %1").arg(width);
            return false;
        }
    } else /* if (version == 2) */ {
        if (height < 1 || height > 300000) {
            error = QString("Height out of range: %1").arg(height);
            return false;
        }
        if (width < 1 || width > 300000) {
            error = QString("Width out of range: %1").arg(width);
            return false;
        }
    }
    if (channelDepth != 1 && channelDepth != 8 && channelDepth != 16) {
        error = QString("Channel depth incorrect: %1").arg(channelDepth);
        return false;
    }
    if (colormode < 0 || colormode > 9) {
        error = QString("Colormode is out of range: %1").arg(colormode);
        return false;
    }
 
    return true;
}

References channelDepth, colormode, error, height, nChannels, signature, version, and width.

◆ write()

bool PSDHeader::write ( QIODevice & device )

write the header data to the given device

Returns: false if writing failed or if this is not a valid header

Definition at line 62 of file psd_header.cpp.

{
    if (!valid())
        return false;
    if (!psdwrite(device, signature))
        return false;
    if (!psdwrite(device, version))
        return false;
    if (!psdpad(device, 6))
        return false;
    if (!psdwrite(device, nChannels))
        return false;
    if (!psdwrite(device, height))
        return false;
    if (!psdwrite(device, width))
        return false;
    if (!psdwrite(device, channelDepth))
        return false;
    if (!psdwrite(device, (quint16)colormode))
        return false;
    return true;
}

References channelDepth, colormode, height, nChannels, psdpad(), psdwrite(), signature, valid(), version, and width.

Member Data Documentation

◆ byteOrder

psd_byte_order PSDHeader::byteOrder

Definition at line 49 of file psd_header.h.

◆ channelDepth

quint16 PSDHeader::channelDepth

Definition at line 47 of file psd_header.h.

◆ colormode

psd_color_mode PSDHeader::colormode

Definition at line 48 of file psd_header.h.

◆ error

QString PSDHeader::error

Definition at line 52 of file psd_header.h.

◆ height

quint32 PSDHeader::height

Definition at line 45 of file psd_header.h.

◆ nChannels

quint16 PSDHeader::nChannels

Definition at line 44 of file psd_header.h.

◆ signature

QString PSDHeader::signature

Definition at line 42 of file psd_header.h.

◆ tiffStyleLayerBlock

bool PSDHeader::tiffStyleLayerBlock

Definition at line 50 of file psd_header.h.

◆ version

quint16 PSDHeader::version

Definition at line 43 of file psd_header.h.

◆ width

quint32 PSDHeader::width

Definition at line 46 of file psd_header.h.

The documentation for this class was generated from the following files:

libs/psd/psd_header.h
libs/psd/psd_header.cpp

Public Member Functions

Public Attributes