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// Copyright (C) 2016 The Qt Company Ltd.
// Copyright (C) 2016 Alex Char.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QICNSHANDLER_P_H
#define QICNSHANDLER_P_H
#include <QtGui/qimageiohandler.h>
#include <QtCore/qlist.h>
#ifndef QT_NO_DATASTREAM
#define MAKEOSTYPE(c0,c1,c2,c3) (((quint8)c0 << 24) | ((quint8)c1 << 16) | ((quint8)c2 << 8) | (quint8)c3)
QT_BEGIN_NAMESPACE
struct ICNSBlockHeader
{
enum OS {
TypeIcns = MAKEOSTYPE('i', 'c', 'n', 's'), // Icns container magic
TypeToc = MAKEOSTYPE('T', 'O', 'C', ' '), // Table of contents
TypeIcnv = MAKEOSTYPE('i', 'c', 'n', 'V'), // Icon Composer version
// Legacy:
TypeClut = MAKEOSTYPE('c', 'l', 'u', 't'), // Color look-up table (pre-OS X resources)
TypeTile = MAKEOSTYPE('t', 'i', 'l', 'e'), // Container (icon variants)
TypeOver = MAKEOSTYPE('o', 'v', 'e', 'r'), // Container (icon variants)
TypeOpen = MAKEOSTYPE('o', 'p', 'e', 'n'), // Container (icon variants)
TypeDrop = MAKEOSTYPE('d', 'r', 'o', 'p'), // Container (icon variants)
TypeOdrp = MAKEOSTYPE('o', 'd', 'r', 'p'), // Container (icon variants)
};
quint32 ostype;
quint32 length;
};
struct ICNSEntry
{
enum Group {
GroupUnknown = 0, // Default for invalid ones
GroupMini = 'm', // "mini" (16x12)
GroupSmall = 's', // "small" (16x16)
GroupLarge = 'l', // "large" (32x32)
GroupHuge = 'h', // "huge" (48x48)
GroupThumbnail = 't', // "thumbnail" (128x128)
GroupPortable = 'p', // "portable"? (Speculation, used for png/jp2)
GroupCompressed = 'c', // "compressed"? (Speculation, used for png/jp2)
// Legacy icons:
GroupICON = 'N', // "ICON" (32x32)
};
enum Depth {
DepthUnknown = 0, // Default for invalid or compressed ones
DepthMono = 1,
Depth4bit = 4,
Depth8bit = 8,
Depth32bit = 32
};
enum Flags {
Unknown = 0x0, // Default for invalid ones
IsIcon = 0x1, // Contains a raw icon without alpha or compressed icon
IsMask = 0x2, // Contains alpha mask
IconPlusMask = IsIcon | IsMask // Contains raw icon and mask combined in one entry (double size)
};
enum Format {
FormatUnknown = 0, // Default for invalid or undetermined ones
RawIcon, // Raw legacy icon, uncompressed
RLE24, // Raw 32bit icon, data is compressed
PNG, // Compressed icon in PNG format
JP2 // Compressed icon in JPEG2000 format
};
quint32 ostype; // Real OSType
quint32 variant; // Virtual OSType: a parent container, zero if parent is icns root
Group group; // ASCII character number
quint32 width; // For uncompressed icons only, zero for compressed ones for now
quint32 height; // For uncompressed icons only, zero for compressed ones fow now
Depth depth; // Color depth
Flags flags; // Flags to determine the type of entry
Format dataFormat; // Format of the image data
quint32 dataLength; // Length of the image data in bytes
qint64 dataOffset; // Offset from the initial position of the file/device
ICNSEntry() :
ostype(0), variant(0), group(GroupUnknown), width(0), height(0), depth(DepthUnknown),
flags(Unknown), dataFormat(FormatUnknown), dataLength(0), dataOffset(0)
{
}
};
Q_DECLARE_TYPEINFO(ICNSEntry, Q_RELOCATABLE_TYPE);
class QICNSHandler : public QImageIOHandler
{
public:
QICNSHandler();
bool canRead() const override;
bool read(QImage *image) override;
bool write(const QImage &image) override;
bool supportsOption(ImageOption option) const override;
QVariant option(ImageOption option) const override;
int imageCount() const override;
bool jumpToImage(int imageNumber) override;
bool jumpToNextImage() override;
static bool canRead(QIODevice *device);
private:
bool ensureScanned() const;
bool scanDevice();
bool addEntry(const ICNSBlockHeader &header, qint64 imgDataOffset, quint32 variant = 0);
const ICNSEntry &getIconMask(const ICNSEntry &icon) const;
private:
enum ScanState {
ScanError = -1,
ScanNotScanned = 0,
ScanSuccess = 1,
};
int m_currentIconIndex;
QList<ICNSEntry> m_icons;
QList<ICNSEntry> m_masks;
ScanState m_state;
};
QT_END_NAMESPACE
#endif // QT_NO_DATASTREAM
#endif /* QICNSHANDLER_P_H */
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