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Bring Windows XP themes to your KDE Plasma environment!
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265// SPDX-License-Identifier: GPL-3.0-or-later#include "app/startbutton.h"
#include "app/gdifont.h"#include "app/panel.h"#include "core/schema.h"
#include <QFontMetrics>#include <QPainter>
#include <cmath>
namespace xpl {
namespace {
bool fail(QString *error, const QString &message){ if (error) *error = message; return false;}
// "Franklin Gothic Medium, 14, italic" at 96 dpi, as GDI sizes it// (MulDiv(points, 96, 72) pixels).QFont fontFrom(const QString &spec, const QFont &fallback){ const QStringList parts = spec.split(QLatin1Char(',')); if (parts.size() < 2) return fallback; QFont font(parts.at(0).trimmed()); font.setPixelSize(int(std::lround(parts.at(1).trimmed().toInt() * 96.0 / 72.0))); for (int i = 2; i < parts.size(); ++i) { const QString flag = parts.at(i).trimmed().toLower(); if (flag == QLatin1String("bold")) font.setBold(true); else if (flag == QLatin1String("italic")) font.setItalic(true); } return gdiFont(font);}
// A box blur of an alpha mask, `radius` wide, twice: uxtheme's "continuous"// text shadow is the text's shape softened, not an outline.QImage blurred(const QImage &mask, int radius){ QImage out = mask; for (int pass = 0; pass < 2; ++pass) for (const bool horizontal : {true, false}) { const QImage in = out; for (int y = 0; y < in.height(); ++y) for (int x = 0; x < in.width(); ++x) { int sum = 0, n = 0; for (int d = -radius; d <= radius; ++d) { const int sx = horizontal ? x + d : x, sy = horizontal ? y : y + d; if (sx < 0 || sy < 0 || sx >= in.width() || sy >= in.height()) continue; sum += qAlpha(in.pixel(sx, sy)); ++n; } out.setPixel(x, y, qRgba(0, 0, 0, n ? sum / n : 0)); } } return out;}
// DrawText(DT_CENTER | DT_VCENTER | DT_SINGLELINE) by GDI's measures.void drawLabel(QPainter &p, const QRect &rect, const QString &label, const QFont &font, const QColor &colour, const QString &shadowType, const QColor &shadowColour, QPoint shadowOffset){ p.setFont(font); const GdiMetrics gm = gdiMetrics(font); const QPoint origin(rect.left() + (rect.width() - gdiTextWidth(font, label)) / 2, rect.top() + (rect.height() - gm.height()) / 2 + gm.ascent); if (shadowType.compare(QLatin1String("single"), Qt::CaseInsensitive) == 0) { p.setPen(shadowColour); p.drawText(origin + shadowOffset, label); } else if (shadowType.compare(QLatin1String("continuous"), Qt::CaseInsensitive) == 0) { QImage mask(p.device()->width(), p.device()->height(), QImage::Format_ARGB32_Premultiplied); mask.fill(Qt::transparent); { QPainter m(&mask); m.setFont(font); m.setPen(Qt::black); m.drawText(origin + shadowOffset, label); } QImage shadow = blurred(mask, 1); QPainter s(&shadow); s.setCompositionMode(QPainter::CompositionMode_SourceIn); s.fillRect(shadow.rect(), shadowColour); s.end(); p.drawImage(0, 0, shadow); } p.setPen(colour); p.drawText(origin, label);}
// Characters as a logo, `height` tall: drawn large and scaled down, in// `colour` -- the label's -- or their own colours where the font has them// (an emoji).QImage characters(const QString &text, int height, const QColor &colour){ QFont font; font.setPixelSize(height * 4); const QFontMetrics fm(font); QImage big(fm.horizontalAdvance(text) + height * 2, fm.height() + height, QImage::Format_ARGB32_Premultiplied); big.fill(Qt::transparent); { QPainter p(&big); p.setRenderHints(QPainter::Antialiasing | QPainter::TextAntialiasing); p.setFont(font); p.setPen(colour); p.drawText(QPoint(height, height / 2 + fm.ascent()), text); } QRect box; for (int y = 0; y < big.height(); ++y) for (int x = 0; x < big.width(); ++x) if (qAlpha(big.pixel(x, y))) box |= QRect(x, y, 1, 1); if (box.isEmpty()) return QImage(); return big.copy(box).scaledToHeight(height, Qt::SmoothTransformation);}
// A picture as a logo: `height` tall (no wider than three times that).QImage picture(const QString &file, int height){ const QImage image(file); if (image.isNull()) return QImage(); const QImage scaled = image.scaledToHeight(height, Qt::SmoothTransformation); return (scaled.width() > 3 * height ? image.scaled(3 * height, height, Qt::KeepAspectRatio, Qt::SmoothTransformation) : scaled) .convertToFormat(QImage::Format_ARGB32_Premultiplied);}
std::optional<StartButtonArt> styleButton(const Look &look, QImage flag, const QString &label, const QString &logoText, QString *error){ const Renderer &r = *look.renderer; const PartRef normal{QStringLiteral("button"), schema::partId(u"button", u"pushbutton"), 1, QStringLiteral("start")}; if (!r.hasPart(normal)) { fail(error, QStringLiteral("%1 has no Start button").arg(look.name)); return std::nullopt; } const QFont font = fontFrom(r.property(normal, u"font").value_or(QString()), QFont(QStringLiteral("Franklin Gothic Medium"))); QRgb text = qRgb(255, 255, 255), shadow = qRgb(0, 0, 0); parseColour(r.property(normal, u"textcolor").value_or(QString()), &text); parseColour(r.property(normal, u"textshadowcolor").value_or(QString()), &shadow); const QStringList off = r.property(normal, u"textshadowoffset").value_or(QStringLiteral("1, 1")).split(QLatin1Char(',')); const QPoint shadowOffset(off.value(0).trimmed().toInt(), off.value(1, off.value(0)).trimmed().toInt()); const QString shadowType = r.property(normal, u"textshadowtype").value_or(QString()); if (const QImage logo = characters(logoText, flag.height(), QColor(text)); !logoText.isEmpty() && !logo.isNull()) flag = logo;
// Measured (Luna, 800 x 600): the button is its content margins round // the flag and the label with a pixel either side of it, 2px taller than // the bar (the rest is off the screen's bottom); the flag at the // content's left, centred. const QMargins cm = r.contentMargins(normal); const int textWidth = gdiTextWidth(font, label) + 2; const QSize size(cm.left() + flag.width() + textWidth + cm.right(), kTaskbarHeight + 2); const QRect content = QRect(QPoint(), size).marginsRemoved(cm);
StartButtonArt art; QImage *out[] = {&art.normal, &art.hover, &art.pressed}; for (int state = 1; state <= 3; ++state) { QImage img = r.background({normal.cls, normal.part, state, normal.sub}, size); { QPainter p(&img); p.setRenderHint(QPainter::TextAntialiasing); p.drawImage(content.left(), content.top() + (content.height() - flag.height()) / 2, flag); const QRect labelRect(content.left() + flag.width(), content.top(), textWidth, content.height()); drawLabel(p, labelRect, label, font, QColor(text), shadowType, QColor(shadow), shadowOffset); } *out[state - 1] = img.copy(0, 0, size.width(), kTaskbarHeight); } return art;}
// Windows Classic (measured, Windows Standard, 800 x 600): a push button// 22px tall, 2px in and 4px down the 30px bar; the small flag (bitmap 176)// 2px into it, centred; a pixel after it "Start" in bold Tahoma, centred in// a slot 2px wider than the text; 2px after that. Pushed, the contents move 1px down and right.std::optional<StartButtonArt> classicButton(const Look &look, QImage flag, const QString &label, const QString &logoText){ const ClassicScheme &s = look.system; const QPalette pal = s.palette(); if (const QImage logo = characters(logoText, flag.height(), s.colour(u"ButtonText")); !logoText.isEmpty() && !logo.isNull()) flag = logo; QFont font(s.metrics.messageFont.face); font.setPixelSize(-s.metrics.messageFont.height); font.setBold(true); font = gdiFont(font); const int textWidth = gdiTextWidth(font, label) + 2; const QRect button(2, 4, 2 + flag.width() + 1 + textWidth + 2, 22); StartButtonArt art; QImage *out[] = {&art.normal, &art.hover, &art.pressed}; for (int state = 0; state < 3; ++state) { QImage img(button.right() + 1, kTaskbarHeight, QImage::Format_ARGB32_Premultiplied); img.fill(Qt::transparent); QPainter p(&img); const bool down = state == 2; classic::pushEdge(&p, button, pal, down); const QPoint shift = down ? QPoint(1, 1) : QPoint(); p.drawImage(button.topLeft() + QPoint(2, (button.height() - flag.height()) / 2) + shift, flag); p.setRenderHint(QPainter::TextAntialiasing); drawLabel(p, QRect(button.left() + 2 + flag.width() + 1, button.top(), textWidth, button.height()).translated(shift), label, font, s.colour(u"ButtonText"), QString(), QColor(), QPoint()); p.end(); *out[state] = img; } return art;}
} // namespace
std::optional<StartButtonArt> startButton(const Look &look, const QImage &flag, const QString &label, QString *error){ if (flag.isNull()) { fail(error, QStringLiteral("no Start flag: XPlasma needs the Windows XP media for it")); return std::nullopt; } const QImage premultiplied = flag.convertToFormat(QImage::Format_ARGB32_Premultiplied); return look.classic() ? classicButton(look, premultiplied, label, QString()) : styleButton(look, premultiplied, label, QString(), error);}
std::optional<StartButtonArt> startButton(const Look &look, const QImage &flag, const StartButtonExtras &extras, QString *error){ if (flag.isNull()) { fail(error, QStringLiteral("no Start flag: XPlasma needs the Windows XP media for it")); return std::nullopt; } QImage logo = flag.convertToFormat(QImage::Format_ARGB32_Premultiplied); QString logoText = extras.logoText; if (!extras.logoFile.isEmpty()) { // (A picture that's gone or unreadable: XP's flag, not no button.) if (const QImage pic = picture(extras.logoFile, flag.height()); !pic.isNull()) logo = pic; logoText.clear(); } const QString label = !extras.label.isEmpty() ? extras.label : look.classic() ? QStringLiteral("Start") : QStringLiteral("start"); return look.classic() ? classicButton(look, logo, label, logoText) : styleButton(look, logo, label, logoText, error);}
StartButtonExtras StartButtonExtras::fromJson(const QJsonObject &o){ return {o.value(QStringLiteral("label")).toString(), o.value(QStringLiteral("logoText")).toString(), o.value(QStringLiteral("logoFile")).toString()};}
QJsonObject StartButtonExtras::toJson() const{ QJsonObject o; if (!label.isEmpty()) o.insert(QStringLiteral("label"), label); if (!logoText.isEmpty()) o.insert(QStringLiteral("logoText"), logoText); if (!logoFile.isEmpty()) o.insert(QStringLiteral("logoFile"), logoFile); return o;}
} // namespace xpl