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Bring Windows XP themes to your KDE Plasma environment!
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120// SPDX-License-Identifier: GPL-3.0-or-later#include "icons.h"
#include <limits> // before QtEndian: Qt 5.15.2's qfloat16.h uses it unincluded (GCC 11+)
#include <QtEndian>
namespace xpl {
namespace {quint16 u16(const QByteArray &b, int at){ return qFromLittleEndian<quint16>(b.constData() + at);}quint32 u32(const QByteArray &b, int at){ return qFromLittleEndian<quint32>(b.constData() + at);}} // namespace
QImage decodeIconImage(const QByteArray &data){ return decodeMaskedImage(data, false);}
QImage decodeMaskedImage(const QByteArray &data, bool cursor){ if (data.startsWith("\x89PNG")) return QImage::fromData(data, "PNG").convertToFormat(QImage::Format_ARGB32); if (data.size() < 40) return QImage(); const quint32 header = u32(data, 0); const int width = qint32(u32(data, 4)); const int height = qint32(u32(data, 8)) / 2; // colours and mask const int bpp = u16(data, 14); const quint32 compression = u32(data, 16); quint32 colours = u32(data, 32); if (header < 40 || width <= 0 || height <= 0 || width > 1024 || height > 1024 || compression != 0 || !(bpp == 1 || bpp == 4 || bpp == 8 || bpp == 24 || bpp == 32)) return QImage(); if (bpp <= 8 && colours == 0) colours = 1u << bpp; if (bpp > 8) colours = 0; const qint64 palette = header, pixels = palette + qint64(colours) * 4; const qint64 stride = ((qint64(width) * bpp + 31) / 32) * 4, maskStride = ((width + 31) / 32) * 4; const qint64 mask = pixels + stride * height; if (mask + maskStride * height > data.size()) return QImage(); const auto *p = reinterpret_cast<const uchar *>(data.constData()); QImage img(width, height, QImage::Format_ARGB32); bool alpha = false; for (int y = 0; y < height; ++y) { const uchar *row = p + pixels + stride * (height - 1 - y); // bottom-up auto *out = reinterpret_cast<QRgb *>(img.scanLine(y)); for (int x = 0; x < width; ++x) { QRgb c = 0; if (bpp == 32) { c = qRgba(row[x * 4 + 2], row[x * 4 + 1], row[x * 4], row[x * 4 + 3]); alpha |= row[x * 4 + 3] != 0; } else if (bpp == 24) { c = qRgb(row[x * 3 + 2], row[x * 3 + 1], row[x * 3]); } else { const int bit = x * bpp; const int index = (row[bit / 8] >> (8 - bpp - bit % 8)) & ((1 << bpp) - 1); const uchar *e = p + palette + (quint32(index) < colours ? index : 0) * 4; c = qRgb(e[2], e[1], e[0]); } out[x] = c; } } // Without an alpha channel, the AND mask's set bits are transparent -- // unless the colour isn't black: that pixel inverts the screen, which a // cursor (only) does, and which comes out black here (its shape). if (!alpha) for (int y = 0; y < height; ++y) { const uchar *row = p + mask + maskStride * (height - 1 - y); auto *out = reinterpret_cast<QRgb *>(img.scanLine(y)); for (int x = 0; x < width; ++x) { const bool masked = (row[x / 8] >> (7 - x % 8)) & 1; if (!masked) out[x] |= 0xff000000u; else out[x] = cursor && (out[x] & 0xffffffu) ? 0xff000000u : 0u; } } return img;}
QMap<int, IconImage> iconGroup(const PeResources &pe, QStringView group, QString *error){ QMap<int, IconImage> out; const Resource *dir = pe.find(u"14", group); if (!dir || dir->data.size() < 6 || u16(dir->data, 0) != 0 || u16(dir->data, 2) != 1) { if (error) *error = QStringLiteral("no icon group %1").arg(group.toString()); return out; } const int count = u16(dir->data, 4); for (int i = 0; i < count && 6 + (i + 1) * 14 <= dir->data.size(); ++i) { const int at = 6 + i * 14; const int id = u16(dir->data, at + 12); const Resource *icon = pe.find(u"3", QString::number(id)); if (!icon) continue; const QImage img = decodeIconImage(icon->data); if (img.isNull() || img.width() != img.height()) continue; const int bits = icon->data.startsWith("\x89PNG") ? 32 : u16(icon->data, 14); auto it = out.find(img.width()); if (it == out.end() || it->bitDepth < bits) out.insert(img.width(), {img, bits}); } if (out.isEmpty() && error) *error = QStringLiteral("icon group %1 has no usable images").arg(group.toString()); return out;}
} // namespace xpl