void TextRendererPrivate::clearBitmapCache()
{
#ifdef NATRON_TEXT_RENDERER_USE_CACHE
for (BitmapCache::iterator it = _bitmapsCache.begin(); it!= _bitmapsCache.end(); ++it) {
delete it.value();
}
_bitmapsCache.clear();
#endif
}
CharBitmap *
TextRendererPrivate::createCharacter(QChar c)
{
#ifdef NATRON_TEXT_RENDERER_USE_CACHE
ushort unic = c.unicode();
//c is already in the cache
BitmapCache::iterator it = _bitmapsCache.find(unic);
if ( it != _bitmapsCache.end() ) {
return it.value();
}
#endif
if ( _usedTextures.empty() ) {
newTransparentTexture();
}
GLuint texture = _usedTextures.back();
GLsizei width = _fontMetrics.width(c);
GLsizei height = _fontMetrics.height();
//render into a new transparant pixmap using QPainter
QImage image(width, height, QImage::Format_ARGB32_Premultiplied);
image.fill(Qt::transparent);
QPainter painter;
painter.begin(&image);
painter.setRenderHints(QPainter::HighQualityAntialiasing
| QPainter::TextAntialiasing);
painter.setFont(_font);
painter.setPen(Qt::white);
painter.drawText(0, _fontMetrics.ascent(), c);
painter.end();
//fill the texture with the QImage
image = QGLWidget::convertToGLFormat(image);
glCheckError();
GLuint savedTexture;
glGetIntegerv(GL_TEXTURE_BINDING_2D, (GLint*)&savedTexture);
glBindTexture(GL_TEXTURE_2D, texture);
assert( glIsTexture(texture) );
glTexSubImage2D( GL_TEXTURE_2D, 0, _xOffset, _yOffset, width, height, GL_RGBA,
GL_UNSIGNED_BYTE, image.bits() );
glCheckError();
glBindTexture(GL_TEXTURE_2D, savedTexture);
CharBitmap *character = new CharBitmap;
character->texID = texture;
character->w = width;
character->h = height;
character->xTexCoords[0] = (GLfloat)_xOffset / TEXTURE_SIZE;
character->xTexCoords[1] = (GLfloat)(_xOffset + width) / TEXTURE_SIZE;
character->yTexCoords[0] = (GLfloat)_yOffset / TEXTURE_SIZE;
character->yTexCoords[1] = (GLfloat)(_yOffset + height) / TEXTURE_SIZE;
#ifdef NATRON_TEXT_RENDERER_USE_CACHE
BitmapCache::iterator retIt = _bitmapsCache.insert(unic, character); // insert a new charactr
assert( retIt != _bitmapsCache.end() );
#endif
_xOffset += width;
if (_xOffset + width >= TEXTURE_SIZE) {
_xOffset = 1;
_yOffset += height;
}
if (_yOffset + height >= TEXTURE_SIZE) {
newTransparentTexture();
_yOffset = 1;
}
#ifdef NATRON_TEXT_RENDERER_USE_CACHE
return retIt.value();
#else
return character;
#endif
} // createCharacter