annotate data/model/PowerOfTwoZoomConstraint.cpp @ 211:e2bbb58e6df6

Several changes related to referring to remote URLs for sessions and files: * Pull file dialog wrapper functions out from MainWindow into FileFinder * If a file referred to in a session is not found at its expected location, try a few other alternatives (same location as the session file or same location as the last audio file) before asking the user to locate it * Allow user to give a URL when locating an audio file, not just locate on the filesystem * Make wave file models remember the "original" location (e.g. URL) of the audio file, not just the actual location from which the data was loaded (e.g. local copy of that URL) -- when saving a session, use the original location so as not to refer to a temporary file * Clean up incompletely-downloaded local copies of files
author Chris Cannam
date Thu, 11 Jan 2007 13:29:58 +0000
parents 3a13b0d4934e
children 59e7fe1b1003
rev   line source
Chris@147 1 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
Chris@147 2
Chris@147 3 /*
Chris@147 4 Sonic Visualiser
Chris@147 5 An audio file viewer and annotation editor.
Chris@147 6 Centre for Digital Music, Queen Mary, University of London.
Chris@147 7 This file copyright 2006 Chris Cannam.
Chris@147 8
Chris@147 9 This program is free software; you can redistribute it and/or
Chris@147 10 modify it under the terms of the GNU General Public License as
Chris@147 11 published by the Free Software Foundation; either version 2 of the
Chris@147 12 License, or (at your option) any later version. See the file
Chris@147 13 COPYING included with this distribution for more information.
Chris@147 14 */
Chris@147 15
Chris@147 16 #include "PowerOfTwoZoomConstraint.h"
Chris@147 17
Chris@147 18 size_t
Chris@147 19 PowerOfTwoZoomConstraint::getNearestBlockSize(size_t req,
Chris@147 20 RoundingDirection dir) const
Chris@147 21 {
Chris@147 22 size_t result = 0;
Chris@147 23
Chris@147 24 for (size_t bs = 1; ; bs *= 2) {
Chris@147 25 if (bs >= req) {
Chris@147 26 if (dir == RoundNearest) {
Chris@147 27 if (bs - req < req - bs/2) {
Chris@147 28 result = bs;
Chris@147 29 break;
Chris@147 30 } else {
Chris@147 31 result = bs/2;
Chris@147 32 break;
Chris@147 33 }
Chris@147 34 } else if (dir == RoundDown) {
Chris@147 35 result = bs/2;
Chris@147 36 break;
Chris@147 37 } else {
Chris@147 38 result = bs;
Chris@147 39 break;
Chris@147 40 }
Chris@147 41 }
Chris@147 42 }
Chris@147 43
Chris@147 44 if (result > getMaxZoomLevel()) result = getMaxZoomLevel();
Chris@147 45 return result;
Chris@147 46 }
Chris@147 47