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Fix drawing MIDI channels with IDs greater than 16

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PRL mentioned a while ago that it was possible to get channels greater
than 16 via allegro files.  This makes those channels correctly work with
the CHANNEL_BIT macro (which was supposed to handle them this way before).
This commit is contained in:
Pokechu22 2017-05-30 08:21:28 -07:00 committed by Paul Licameli
parent 62ebb2f95d
commit 896d5d682b
1 changed files with 4 additions and 2 deletions
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6
src/NoteTrack.h
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@ -199,8 +199,10 @@ class AUDACITY_DLL_API NoteTrack final
// map all channel numbers mod 16. This will have no effect // map all channel numbers mod 16. This will have no effect
// on MIDI files, but it will allow users to at least select // on MIDI files, but it will allow users to at least select
// all channels on non-MIDI event sequence data. // all channels on non-MIDI event sequence data.
#define ALL_CHANNELS 0xFFFF #define NUM_CHANNELS 16
#define CHANNEL_BIT(c) (1 << (c & ALL_CHANNELS)) // Bitmask with all NUM_CHANNELS bits set
#define ALL_CHANNELS (1 << NUM_CHANNELS) - 1
#define CHANNEL_BIT(c) (1 << (c % NUM_CHANNELS))
bool IsVisibleChan(int c) const { bool IsVisibleChan(int c) const {
return (mVisibleChannels & CHANNEL_BIT(c)) != 0; return (mVisibleChannels & CHANNEL_BIT(c)) != 0;
} }