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#include <QtCore>
#include <QtGui>
const int inSize = 1024;
const int outSize = 32;
const int charRange = 0x8A;
static void usage()
{
qWarning("Usage: distfieldgen [options] <font_filename>");
qWarning(" ");
qWarning(" options:");
qWarning(" -d <directory>................................ output directory");
qWarning(" ");
exit(1);
}
void printProgress(int p)
{
printf("\r[");
for (int i = 0; i < 50; ++i)
printf(i < p / 2 ? "=" : " ");
printf("]");
printf(" %d%%", p);
fflush(stdout);
}
float mindist(const QImage &in, int w, int h, int x, int y, int r, float maxdist)
{
int i, j, startx, starty, stopx, stopy, hit;
float d, dx, dy;
float mind = maxdist;
int p;
bool outside = (0 == qAlpha(in.pixel(x, y)));
startx = qMax(0, x - r);
starty = qMax(0, y - r);
stopx = qMin(w, x + r);
stopy = qMin(h, y + r);
for (i = starty; i < stopy; i++) {
for (j = startx; j < stopx; j++) {
p = qAlpha(in.pixel(j, i));
dx = j - x;
dy = i - y;
d = dx * dx + dy * dy;
hit = (p != 0) == outside;
if (hit && (d < mind)) {
mind = d;
}
}
}
if (outside)
return sqrtf(mind);
else
return -sqrtf(mind);
}
QImage renderDistanceField(const QImage &in)
{
int outWidth = outSize * (float(in.width()) / in.height());
int outHeight = outSize;
QImage df(outWidth, outHeight, QImage::Format_ARGB32_Premultiplied);
int x, y, ix, iy;
float d;
float sx = in.width() / float(outWidth);
float sy = in.height() / float(outHeight);
int r = 90;
float maxsq = 2 * r * r;
float max = qSqrt(maxsq);
for(y = 0; y < outHeight; y++){
for(x = 0; x < outWidth; x++){
ix = (x * sx) + (sx / 2);
iy = (y * sy) + (sy / 2);
d = mindist(in, in.width(), in.height(), ix, iy, r, maxsq);
float a = 127.5f + 127.5f * (-d / max);
df.setPixel(x, y, qRgba(0, 0, 0, qRound(a)));
}
}
return df;
}
class DistFieldGenTask : public QRunnable
{
public:
DistFieldGenTask(int c, int nbGlyph, const QImage &glyph, QMap<int, QImage> *outList)
: QRunnable()
, m_char(c)
, m_nbGlyph(nbGlyph)
, m_glyph(glyph)
, m_outList(outList)
{ }
void run()
{
QImage df = renderDistanceField(m_glyph);
QMutexLocker lock(&m_mutex);
m_outList->insert(m_char, df);
printProgress(float(m_outList->count()) / m_nbGlyph * 100);
}
static QMutex m_mutex;
int m_char;
int m_nbGlyph;
QImage m_glyph;
QMap<int, QImage> *m_outList;
};
QMutex DistFieldGenTask::m_mutex;
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QStringList args = QApplication::arguments();
if (argc < 2 ||
args.contains("--help") || args.contains("-help") || args.contains("--h") || args.contains("-h"))
usage();
QString fontFile;
QString destDir;
for (int i = 0; i < args.count(); ++i) {
QString a = args.at(i);
if (!a.startsWith('-') && QFileInfo(a).exists())
fontFile = a;
if (a == QLatin1String("-d"))
destDir = args.at(++i);
}
// Load the font
int fontID = QFontDatabase::addApplicationFont(fontFile);
if (fontID == -1) {
qWarning("Error: Invalid font file.");
qWarning(" ");
exit(1);
}
QFileInfo fi(fontFile);
if (destDir.isEmpty()) {
destDir = fi.canonicalPath();
} else {
QFileInfo dfi(destDir);
if (!dfi.isDir()) {
qWarning("Error: '%s' is not a directory.", destDir.toLatin1().constData());
qWarning(" ");
exit(1);
}
destDir = dfi.canonicalFilePath();
}
QStringList families = QFontDatabase::applicationFontFamilies(fontID);
QFont f(families.at(0));
f.setPixelSize(inSize);
QFontMetricsF fm(f);
printf("Rendering glyphs for font '%s'\n", f.family().toLatin1().constData());
printProgress(0);
QList<QImage> glyphs;
QMap<int, QImage> distfields;
// Render glyphs
for (int i = 0; i < charRange; ++i) {
QChar c(i);
QImage glyph(fm.width(c), fm.height(), QImage::Format_ARGB32_Premultiplied);
glyph.fill(Qt::transparent);
QPainter p(&glyph);
p.setFont(f);
p.drawText(glyph.rect(), Qt::AlignHCenter | Qt::AlignVCenter, c);
p.end();
glyphs.append(glyph);
printProgress(float(i) / charRange * 100);
}
printProgress(100);
printf("\nGenerating distance field\n");
printProgress(0);
// Generate distance field for each glyph
int i = 0;
foreach (const QImage &g, glyphs) {
QRunnable *run = new DistFieldGenTask(i, glyphs.count(), g, &distfields);
QThreadPool::globalInstance()->start(run);
++i;
}
QThreadPool::globalInstance()->waitForDone();
printProgress(100);
printf("\nFinishing\n");
printProgress(0);
// Combine dist fields in one image
int totalWidth = 0;
foreach (const QImage &df, distfields.values())
totalWidth += df.width() > 0 ? df.width() : outSize;
QImage output(1024, (totalWidth / 1024 + 1) * outSize, QImage::Format_ARGB32_Premultiplied);
output.fill(Qt::transparent);
int combinedWidth = 0;
i = 0;
QPainter p(&output);
foreach (const QImage &df, distfields.values()) {
if (combinedWidth % 1024 + df.width() > 1024)
combinedWidth = (combinedWidth / 1024 + 1) * 1024;
p.drawImage(combinedWidth % 1024, (combinedWidth / 1024) * outSize, df);
combinedWidth += df.width() > 0 ? df.width() : outSize;
printProgress(float(i) / distfields.count() * 100);
++i;
}
p.end();
printProgress(100);
printf("\n");
// Save output
output.save(QString("%1/%2.png").arg(destDir).arg(fi.baseName()));
return 0;
}
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