void TileDownloader::downloadPicture(unsigned int index)
{
const PictureInfo& info = mPictures[index];
//Downloading all tiles in parallel
{
boost::threadpool::pool tp(info.tiles.size());
for (unsigned int i=0; i<info.tiles.size(); ++i)
tp.schedule(boost::bind(&TileDownloader::downloadPictureTile, this, index, i));
}
//compose all tiles on the canvas
unsigned int width = info.width;
unsigned int height = info.height;
Ogre::Canvas::Context* ctx = new Ogre::Canvas::Context(width, height, false);
for (unsigned int i=0; i<info.tiles.size(); ++i)
{
const TileInfo& tileInfo = info.tiles[i];
Ogre::Image img;
std::stringstream filename;
filename << tileInfo.j << "_" << tileInfo.i << ".jpg";
img.load(filename.str(), Ogre::ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME);
float x = (tileInfo.i == 0) ? 0 : 509.0f + (tileInfo.i-1)*510.0f;
float y = (tileInfo.j == 0) ? 0 : 509.0f + (tileInfo.j-1)*510.0f;
ctx->drawImage(img, x, y);
}
//save canvas to jpeg
ctx->saveToFile(info.filePath);
delete ctx;
}
