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Bring Windows XP themes to your KDE Plasma environment!
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889// SPDX-License-Identifier: GPL-3.0-or-later#include "app/gdifont.h"
#include <QRawFont>#include <QtEndian>
#include <cmath>
namespace xpl {
namespace {quint16 u16(const QByteArray &table, int at){ return at + 2 <= table.size() ? qFromBigEndian<quint16>(table.constData() + at) : 0;}} // namespace
GdiMetrics gdiMetrics(const QFont &font){ const QRawFont raw = QRawFont::fromFont(font); const QByteArray head = raw.fontTable("head"), os2 = raw.fontTable("OS/2"); const int upem = u16(head, 18); const int px = font.pixelSize() > 0 ? font.pixelSize() : int(std::lround(raw.pixelSize())); GdiMetrics m; if (upem > 0 && os2.size() >= 78) { m.ascent = int(std::lround(double(u16(os2, 74)) * px / upem)); m.descent = int(std::lround(double(u16(os2, 76)) * px / upem)); } else { m.ascent = int(std::lround(raw.ascent())); m.descent = int(std::lround(raw.descent())); } return m;}
int gdiTextWidth(const QFont &font, const QString &text){ const QRawFont raw = QRawFont::fromFont(font); const QList<quint32> glyphs = raw.glyphIndexesForString(text); const int px = font.pixelSize() > 0 ? font.pixelSize() : int(std::lround(raw.pixelSize())); // hdmx: version, numRecords, sizeDeviceRecord; then per size // {pixelSize, maxWidth, widths[numGlyphs]}. const QByteArray hdmx = raw.fontTable("hdmx"); if (hdmx.size() >= 8) { const int records = qint16(u16(hdmx, 2)); const int recordSize = int(qFromBigEndian<qint32>(hdmx.constData() + 4)); for (int i = 0; i < records && recordSize > 2; ++i) { const int at = 8 + i * recordSize; if (at + recordSize > hdmx.size() || quint8(hdmx[at]) != px) continue; int width = 0; for (const quint32 g : glyphs) width += int(g) + 2 < recordSize ? quint8(hdmx[at + 2 + int(g)]) : 0; return width; } } const QByteArray head = raw.fontTable("head"), hhea = raw.fontTable("hhea"), hmtx = raw.fontTable("hmtx"); const int upem = u16(head, 18), metrics = u16(hhea, 34); int width = 0; for (const quint32 g : glyphs) { const int index = int(g) < metrics ? int(g) : metrics - 1; width += upem > 0 ? int(std::lround(double(u16(hmtx, index * 4)) * px / upem)) : 0; } return width;}
bool gdiSmooths(const QFont &font){ const QRawFont raw = QRawFont::fromFont(font); const QByteArray gasp = raw.fontTable("gasp"); const int px = font.pixelSize() > 0 ? font.pixelSize() : int(std::lround(raw.pixelSize())); // gasp: version, numRanges, then {rangeMaxPPEM, rangeGaspBehavior}; // GASP_DOGRAY is 0x0002. const int ranges = u16(gasp, 2); for (int i = 0; i < ranges && 4 + (i + 1) * 4 <= gasp.size(); ++i) if (px <= u16(gasp, 4 + i * 4)) return u16(gasp, 6 + i * 4) & 0x0002; return gasp.isEmpty(); // (no table: smoothed)}
QFont gdiFont(QFont font){ font.setHintingPreference(QFont::PreferFullHinting); if (!gdiSmooths(font)) font.setStyleStrategy(QFont::NoAntialias); return font;}
} // namespace xpl