QImage TextureFile::palette() const
{
if (depth() >= 16) {
return QImage();
}
QImage image(paletteSize(), QImage::Format_ARGB32);
int x, y;
const int maxWidth = image.width() - 1,
maxHeight = image.height() - 1;
image.fill(Qt::black);
x = y = 0;
foreach (const QVector<QRgb> &colorTable, exportColorTables()) {
foreach (const QRgb &color, colorTable) {
if (y > maxHeight) {
qWarning() << "More color tables than palette height";
return image;
}
image.setPixel(x, y, color);
if (x >= maxWidth) {
x = 0;
++y;
} else {
++x;
}
}
}
GLuint QOpenGL2GradientCache::addCacheElement(quint64 hash_val, const QGradient &gradient, qreal opacity)
{
QOpenGLFunctions *funcs = QOpenGLContext::currentContext()->functions();
if (cache.size() == maxCacheSize()) {
int elem_to_remove = qrand() % maxCacheSize();
quint64 key = cache.keys()[elem_to_remove];
// need to call glDeleteTextures on each removed cache entry:
QOpenGLGradientColorTableHash::const_iterator it = cache.constFind(key);
do {
funcs->glDeleteTextures(1, &it.value().texId);
} while (++it != cache.constEnd() && it.key() == key);
cache.remove(key); // may remove more than 1, but OK
}
CacheInfo cache_entry(gradient.stops(), opacity, gradient.interpolationMode());
uint buffer[1024];
generateGradientColorTable(gradient, buffer, paletteSize(), opacity);
funcs->glGenTextures(1, &cache_entry.texId);
funcs->glBindTexture(GL_TEXTURE_2D, cache_entry.texId);
funcs->glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, paletteSize(), 1,
0, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
return cache.insert(hash_val, cache_entry).value().texId;
}
