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audacity/src/effects/Compressor.cpp
Leland Lucius c2d8aa9421 Missing include when building for wx3.
2015-05-16 00:29:53 -05:00

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/**********************************************************************
Audacity: A Digital Audio Editor
Compressor.cpp
Dominic Mazzoni
Martyn Shaw
Steve Jolly
*******************************************************************//**
\class EffectCompressor
\brief An Effect derived from EffectTwoPassSimpleMono
- Martyn Shaw made it inherit from EffectTwoPassSimpleMono 10/2005.
- Steve Jolly made it inherit from EffectSimpleMono.
- GUI added and implementation improved by Dominic Mazzoni, 5/11/2003.
*//****************************************************************//**
\class CompressorPanel
\brief Panel used within the EffectCompressor for EffectCompressor.
*//*******************************************************************/
#include "../Audacity.h"
#include <math.h>
#include <wx/brush.h>
#include <wx/dcclient.h>
#include <wx/dcmemory.h>
#include <wx/intl.h>
#include <wx/msgdlg.h>
#include "../AColor.h"
#include "../Prefs.h"
#include "../float_cast.h"
#include "../widgets/Ruler.h"
#include "Compressor.h"
enum
{
ID_Threshold = 10000,
ID_NoiseFloor,
ID_Ratio,
ID_Attack,
ID_Decay
};
// Define keys, defaults, minimums, and maximums for the effect parameters
//
// Name Type Key Def Min Max Scale
Param( Threshold, double, XO("Threshold"), -12.0, -60.0, -1.0, 1 );
Param( NoiseFloor, double, XO("NoiseFloor"), -40.0, -80.0, -20.0, 5 );
Param( Ratio, double, XO("Ratio"), 2.0, 1.5, 10.0, 2 );
Param( AttackTime, double, XO("AttackTime"), 0.2, 0.1, 5.0, 100 );
Param( ReleaseTime, double, XO("ReleaseTime"), 1.0, 1.0, 30.0, 10 );
Param( Normalize, bool, XO("Normalize"), true, false, true, 1 );
Param( UsePeak, bool, XO("UsePeak"), false, false, true, 1 );
//----------------------------------------------------------------------------
// EffectCompressor
//----------------------------------------------------------------------------
BEGIN_EVENT_TABLE(EffectCompressor, wxEvtHandler)
EVT_SLIDER(wxID_ANY, EffectCompressor::OnSlider)
END_EVENT_TABLE()
EffectCompressor::EffectCompressor()
{
mThresholdDB = DEF_Threshold;
mNoiseFloorDB = DEF_NoiseFloor;
mAttackTime = DEF_AttackTime; // seconds
mDecayTime = DEF_ReleaseTime; // seconds
mRatio = DEF_Ratio; // positive number > 1.0
mNormalize = DEF_Normalize;
mUsePeak = DEF_UsePeak;
mThreshold = 0.25;
mNoiseFloor = 0.01;
mCompression = 0.5;
mCircle = NULL;
mFollow1 = NULL;
mFollow2 = NULL;
mFollowLen = 0;
SetLinearEffectFlag(false);
}
EffectCompressor::~EffectCompressor()
{
if (mCircle) {
delete[] mCircle;
mCircle = NULL;
}
if(mFollow1!=NULL) {
delete[] mFollow1;
mFollow1 = NULL;
}
if(mFollow2!=NULL) {
delete[] mFollow2;
mFollow2 = NULL;
}
}
// IdentInterface implementation
wxString EffectCompressor::GetSymbol()
{
return COMPRESSOR_PLUGIN_SYMBOL;
}
wxString EffectCompressor::GetDescription()
{
return XO("Compresses the dynamic range of audio");
}
// EffectIdentInterface implementation
EffectType EffectCompressor::GetType()
{
return EffectTypeProcess;
}
// EffectClientInterface implementation
bool EffectCompressor::GetAutomationParameters(EffectAutomationParameters & parms)
{
parms.Write(KEY_Threshold, mThresholdDB);
parms.Write(KEY_NoiseFloor, mNoiseFloorDB);
parms.Write(KEY_Ratio, mRatio);
parms.Write(KEY_AttackTime, mAttackTime);
parms.Write(KEY_ReleaseTime, mDecayTime);
parms.Write(KEY_Normalize, mNormalize);
parms.Write(KEY_UsePeak, mUsePeak);
return true;
}
bool EffectCompressor::SetAutomationParameters(EffectAutomationParameters & parms)
{
ReadAndVerifyDouble(Threshold);
ReadAndVerifyDouble(NoiseFloor);
ReadAndVerifyDouble(Ratio);
ReadAndVerifyDouble(AttackTime);
ReadAndVerifyDouble(ReleaseTime);
ReadAndVerifyBool(Normalize);
ReadAndVerifyBool(UsePeak);
mThresholdDB = Threshold;
mNoiseFloorDB = NoiseFloor;
mRatio = Ratio;
mAttackTime = AttackTime;
mDecayTime = ReleaseTime;
mNormalize = Normalize;
mUsePeak = UsePeak;
return true;
}
// Effect Implemenration
bool EffectCompressor::Startup()
{
wxString base = wxT("/Effects/Compressor/");
// Migrate settings from 2.1.0 or before
// Already migrated, so bail
if (gPrefs->Exists(base + wxT("Migrated")))
{
return true;
}
// Load the old "current" settings
if (gPrefs->Exists(base))
{
gPrefs->Read(base + wxT("ThresholdDB"), &mThresholdDB, -12.0f );
gPrefs->Read(base + wxT("NoiseFloorDB"), &mNoiseFloorDB, -40.0f );
gPrefs->Read(base + wxT("Ratio"), &mRatio, 2.0f );
gPrefs->Read(base + wxT("AttackTime"), &mAttackTime, 0.2f );
gPrefs->Read(base + wxT("DecayTime"), &mDecayTime, 1.0f );
gPrefs->Read(base + wxT("Normalize"), &mNormalize, true );
gPrefs->Read(base + wxT("UsePeak"), &mUsePeak, false );
SaveUserPreset(GetCurrentSettingsGroup());
// Do not migrate again
gPrefs->Write(base + wxT("Migrated"), true);
gPrefs->Flush();
}
return true;
}
void EffectCompressor::PopulateOrExchange(ShuttleGui & S)
{
S.SetBorder(5);
S.StartHorizontalLay(wxEXPAND, true);
{
S.SetBorder(10);
mPanel = new EffectCompressorPanel(S.GetParent(),
mThresholdDB,
mNoiseFloorDB,
mRatio);
mPanel->SetMinSize(wxSize(400, 200));
S.Prop(true).AddWindow(mPanel, wxEXPAND | wxALL);
S.SetBorder(5);
}
S.EndHorizontalLay();
S.StartStatic(wxT(""));
{
S.StartMultiColumn(3, wxEXPAND | wxALIGN_CENTER_VERTICAL);
{
S.SetStretchyCol(1);
mThresholdLabel = S.AddVariableText(_("Threshold:"), true,
wxALIGN_RIGHT | wxALIGN_CENTER_VERTICAL);
S.SetStyle(wxSL_HORIZONTAL);
mThresholdSlider = S.Id(ID_Threshold).AddSlider(wxT(""),
DEF_Threshold * SCL_Threshold,
MAX_Threshold * SCL_Threshold,
MIN_Threshold * SCL_Threshold);
mThresholdSlider->SetName(_("Threshold"));
mThresholdText = S.AddVariableText(wxT("XXX dB"), true,
wxALIGN_LEFT | wxALIGN_CENTER_VERTICAL);
mNoiseFloorLabel = S.AddVariableText(_("Noise Floor:"), true,
wxALIGN_RIGHT | wxALIGN_CENTER_VERTICAL);
S.SetStyle(wxSL_HORIZONTAL);
mNoiseFloorSlider = S.Id(ID_NoiseFloor).AddSlider(wxT(""),
DEF_NoiseFloor / SCL_NoiseFloor,
MAX_NoiseFloor / SCL_NoiseFloor,
MIN_NoiseFloor / SCL_NoiseFloor);
mNoiseFloorSlider->SetName(_("Noise Floor"));
mNoiseFloorText = S.AddVariableText(wxT("XXX dB"), true,
wxALIGN_LEFT | wxALIGN_CENTER_VERTICAL);
mRatioLabel = S.AddVariableText(_("Ratio:"), true,
wxALIGN_RIGHT | wxALIGN_CENTER_VERTICAL);
S.SetStyle(wxSL_HORIZONTAL);
mRatioSlider = S.Id(ID_Ratio).AddSlider(wxT(""),
DEF_Ratio * SCL_Ratio,
MAX_Ratio * SCL_Ratio,
MIN_Ratio * SCL_Ratio);
mRatioSlider->SetName(_("Ratio"));
mRatioText = S.AddVariableText(wxT("XXXX:1"), true,
wxALIGN_LEFT | wxALIGN_CENTER_VERTICAL);
/* i18n-hint: Particularly in percussion, sounds can be regarded as having
* an 'attack' phase where the sound builds up and a 'decay' where the
* sound dies away. So this means 'onset duration'. */
mAttackLabel = S.AddVariableText(_("Attack Time:"), true,
wxALIGN_RIGHT | wxALIGN_CENTER_VERTICAL);
S.SetStyle(wxSL_HORIZONTAL);
mAttackSlider = S.Id(ID_Attack).AddSlider(wxT(""),
DEF_AttackTime * SCL_AttackTime,
MAX_AttackTime * SCL_AttackTime,
MIN_AttackTime * SCL_AttackTime);
mAttackSlider->SetName(_("Attack Time"));
mAttackText = S.AddVariableText(wxT("XXXX secs"), true,
wxALIGN_LEFT | wxALIGN_CENTER_VERTICAL);
mDecayLabel = S.AddVariableText(_("Release Time:"), true,
wxALIGN_RIGHT | wxALIGN_CENTER_VERTICAL);
S.SetStyle(wxSL_HORIZONTAL);
mDecaySlider = S.Id(ID_Decay).AddSlider(wxT(""),
DEF_ReleaseTime * SCL_ReleaseTime,
MAX_ReleaseTime * SCL_ReleaseTime,
MIN_ReleaseTime * SCL_ReleaseTime);
mDecaySlider->SetName(_("Release Time"));
mDecayText = S.AddVariableText(wxT("XXXX secs"), true,
wxALIGN_LEFT | wxALIGN_CENTER_VERTICAL);
}
S.EndMultiColumn();
}
S.EndStatic();
S.StartHorizontalLay(wxCENTER, false);
{
/* i18n-hint: Make-up, i.e. correct for any reduction, rather than fabricate it.*/
mGainCheckBox = S.AddCheckBox(_("Make-up gain for 0 dB after compressing"),
DEF_Normalize ? wxT("true") : wxT("false"));
mPeakCheckBox = S.AddCheckBox(_("Compress based on Peaks"),
DEF_UsePeak ? wxT("true") : wxT("false"));
}
S.EndHorizontalLay();
}
bool EffectCompressor::TransferDataToWindow()
{
mThresholdSlider->SetValue(lrint(mThresholdDB));
mNoiseFloorSlider->SetValue(lrint(mNoiseFloorDB / SCL_NoiseFloor));
mRatioSlider->SetValue(lrint(mRatio * SCL_Ratio));
mAttackSlider->SetValue(lrint(mAttackTime * SCL_AttackTime));
mDecaySlider->SetValue(lrint(mDecayTime * SCL_ReleaseTime));
mGainCheckBox->SetValue(mNormalize);
mPeakCheckBox->SetValue(mUsePeak);
UpdateUI();
return true;
}
bool EffectCompressor::TransferDataFromWindow()
{
if (!mUIParent->Validate())
{
return false;
}
mThresholdDB = (double) mThresholdSlider->GetValue();
mNoiseFloorDB = (double) mNoiseFloorSlider->GetValue() * SCL_NoiseFloor;
mRatio = (double) mRatioSlider->GetValue() / SCL_Ratio;
mAttackTime = (double) mAttackSlider->GetValue() / 100.0; //SCL_AttackTime;
mDecayTime = (double) mDecaySlider->GetValue() / SCL_ReleaseTime;
mNormalize = mGainCheckBox->GetValue();
mUsePeak = mPeakCheckBox->GetValue();
return true;
}
// EffectTwoPassSimpleMono implementation
bool EffectCompressor::NewTrackPass1()
{
mThreshold = pow(10.0, mThresholdDB/20); // factor of 20 because it's power
mNoiseFloor = pow(10.0, mNoiseFloorDB/20);
mNoiseCounter = 100;
mAttackInverseFactor = exp(log(mThreshold) / (mCurRate * mAttackTime + 0.5));
mAttackFactor = 1.0 / mAttackInverseFactor;
mDecayFactor = exp(log(mThreshold) / (mCurRate * mDecayTime + 0.5));
if(mRatio > 1)
mCompression = 1.0-1.0/mRatio;
else
mCompression = 0.0;
mLastLevel = mThreshold;
if (mCircle)
delete[] mCircle;
mCircleSize = 100;
mCircle = new double[mCircleSize];
for(int j=0; j<mCircleSize; j++) {
mCircle[j] = 0.0;
}
mCirclePos = 0;
mRMSSum = 0.0;
return true;
}
bool EffectCompressor::InitPass1()
{
mMax=0.0;
if (!mNormalize)
DisableSecondPass();
// Find the maximum block length required for any track
sampleCount maxlen=0;
SelectedTrackListOfKindIterator iter(Track::Wave, mTracks);
WaveTrack *track = (WaveTrack *) iter.First();
while (track) {
sampleCount len=track->GetMaxBlockSize();
if(len > maxlen)
maxlen = len;
//Iterate to the next track
track = (WaveTrack *) iter.Next();
}
if(mFollow1!=NULL) {
delete[] mFollow1;
mFollow1 = NULL;
}
if(mFollow2!=NULL) {
delete[] mFollow2;
mFollow2 = NULL;
}
// Allocate buffers for the envelope
if(maxlen > 0) {
mFollow1 = new float[maxlen];
mFollow2 = new float[maxlen];
}
mFollowLen = maxlen;
return true;
}
bool EffectCompressor::InitPass2()
{
// Actually, this should not even be called, because we call
// DisableSecondPass() before, if mNormalize is false.
return mNormalize;
}
// Process the input with 2 buffers available at a time
// buffer1 will be written upon return
// buffer2 will be passed as buffer1 on the next call
bool EffectCompressor::TwoBufferProcessPass1(float *buffer1, sampleCount len1, float *buffer2, sampleCount len2)
{
int i;
// If buffers are bigger than allocated, then abort
// (this should never happen, but if it does, we don't want to crash)
if((len1 > mFollowLen) || (len2 > mFollowLen))
return false;
// This makes sure that the initial value is well-chosen
// buffer1 == NULL on the first and only the first call
if (buffer1 == NULL) {
// Initialize the mLastLevel to the peak level in the first buffer
// This avoids problems with large spike events near the beginning of the track
mLastLevel = mThreshold;
for(i=0; i<len2; i++) {
if(mLastLevel < fabs(buffer2[i]))
mLastLevel = fabs(buffer2[i]);
}
}
// buffer2 is NULL on the last and only the last call
if(buffer2 != NULL) {
Follow(buffer2, mFollow2, len2, mFollow1, len1);
}
if(buffer1 != NULL) {
for (i = 0; i < len1; i++) {
buffer1[i] = DoCompression(buffer1[i], mFollow1[i]);
}
}
#if 0
// Copy the envelope over the track data (for debug purposes)
memcpy(buffer1, mFollow1, len1*sizeof(float));
#endif
// Rotate the buffer pointers
float *tmpfloat = mFollow1;
mFollow1 = mFollow2;
mFollow2 = tmpfloat;
return true;
}
bool EffectCompressor::ProcessPass2(float *buffer, sampleCount len)
{
if (mMax != 0)
{
for (int i = 0; i < len; i++)
buffer[i] /= mMax;
}
return true;
}
void EffectCompressor::FreshenCircle()
{
// Recompute the RMS sum periodically to prevent accumulation of rounding errors
// during long waveforms
mRMSSum = 0;
for(int i=0; i<mCircleSize; i++)
mRMSSum += mCircle[i];
}
float EffectCompressor::AvgCircle(float value)
{
float level;
// Calculate current level from root-mean-squared of
// circular buffer ("RMS")
mRMSSum -= mCircle[mCirclePos];
mCircle[mCirclePos] = value*value;
mRMSSum += mCircle[mCirclePos];
level = sqrt(mRMSSum/mCircleSize);
mCirclePos = (mCirclePos+1)%mCircleSize;
return level;
}
void EffectCompressor::Follow(float *buffer, float *env, int len, float *previous, int previous_len)
{
/*
"Follow"ing algorithm by Roger B. Dannenberg, taken from
Nyquist. His description follows. -DMM
Description: this is a sophisticated envelope follower.
The input is an envelope, e.g. something produced with
the AVG function. The purpose of this function is to
generate a smooth envelope that is generally not less
than the input signal. In other words, we want to "ride"
the peaks of the signal with a smooth function. The
algorithm is as follows: keep a current output value
(called the "value"). The value is allowed to increase
by at most rise_factor and decrease by at most fall_factor.
Therefore, the next value should be between
value * rise_factor and value * fall_factor. If the input
is in this range, then the next value is simply the input.
If the input is less than value * fall_factor, then the
next value is just value * fall_factor, which will be greater
than the input signal. If the input is greater than value *
rise_factor, then we compute a rising envelope that meets
the input value by working bacwards in time, changing the
previous values to input / rise_factor, input / rise_factor^2,
input / rise_factor^3, etc. until this new envelope intersects
the previously computed values. There is only a limited buffer
in which we can work backwards, so if the new envelope does not
intersect the old one, then make yet another pass, this time
from the oldest buffered value forward, increasing on each
sample by rise_factor to produce a maximal envelope. This will
still be less than the input.
The value has a lower limit of floor to make sure value has a
reasonable positive value from which to begin an attack.
*/
int i;
double level,last;
if(!mUsePeak) {
// Update RMS sum directly from the circle buffer
// to avoid accumulation of rounding errors
FreshenCircle();
}
// First apply a peak detect with the requested decay rate
last = mLastLevel;
for(i=0; i<len; i++) {
if(mUsePeak)
level = fabs(buffer[i]);
else // use RMS
level = AvgCircle(buffer[i]);
// Don't increase gain when signal is continuously below the noise floor
if(level < mNoiseFloor) {
mNoiseCounter++;
} else {
mNoiseCounter = 0;
}
if(mNoiseCounter < 100) {
last *= mDecayFactor;
if(last < mThreshold)
last = mThreshold;
if(level > last)
last = level;
}
env[i] = last;
}
mLastLevel = last;
// Next do the same process in reverse direction to get the requested attack rate
last = mLastLevel;
for(i=len-1; i>=0; i--) {
last *= mAttackInverseFactor;
if(last < mThreshold)
last = mThreshold;
if(env[i] < last)
env[i] = last;
else
last = env[i];
}
if((previous != NULL) && (previous_len > 0)) {
// If the previous envelope was passed, propagate the rise back until we intersect
for(i=previous_len-1; i>0; i--) {
last *= mAttackInverseFactor;
if(last < mThreshold)
last = mThreshold;
if(previous[i] < last)
previous[i] = last;
else // Intersected the previous envelope buffer, so we are finished
return;
}
// If we can't back up far enough, project the starting level forward
// until we intersect the desired envelope
last = previous[0];
for(i=1; i<previous_len; i++) {
last *= mAttackFactor;
if(previous[i] > last)
previous[i] = last;
else // Intersected the desired envelope, so we are finished
return;
}
// If we still didn't intersect, then continue ramp up into current buffer
for(i=0; i<len; i++) {
last *= mAttackFactor;
if(buffer[i] > last)
buffer[i] = last;
else // Finally got an intersect
return;
}
// If we still didn't intersect, then reset mLastLevel
mLastLevel = last;
}
}
float EffectCompressor::DoCompression(float value, double env)
{
float out;
if(mUsePeak) {
// Peak values map 1.0 to 1.0 - 'upward' compression
out = value * pow(1.0/env, mCompression);
} else {
// With RMS-based compression don't change values below mThreshold - 'downward' compression
out = value * pow(mThreshold/env, mCompression);
}
// Retain the maximum value for use in the normalization pass
if(mMax < fabs(out))
mMax = fabs(out);
return out;
}
void EffectCompressor::OnSlider(wxCommandEvent & WXUNUSED(evt))
{
TransferDataFromWindow();
UpdateUI();
}
void EffectCompressor::UpdateUI()
{
mThresholdLabel->SetName(wxString::Format(_("Threshold %d dB"), (int) mThresholdDB));
/* i18n-hint: usually leave this as is as dB doesn't get translated*/
mThresholdText->SetLabel(wxString::Format(_("%3d dB"), (int) mThresholdDB));
mThresholdText->SetName(mThresholdText->GetLabel()); // fix for bug 577 (NVDA/Narrator screen readers do not read static text in dialogs)
mNoiseFloorLabel->SetName(wxString::Format(_("Noise Floor %d dB"), (int) mNoiseFloorDB));
mNoiseFloorText->SetLabel(wxString::Format(_("%3d dB"), (int) mNoiseFloorDB));
mNoiseFloorText->SetName(mNoiseFloorText->GetLabel()); // fix for bug 577 (NVDA/Narrator screen readers do not read static text in dialogs)
if (mRatioSlider->GetValue() % 2 == 0) {
mRatioLabel->SetName(wxString::Format(_("Ratio %.0f to 1"), mRatio));
/* i18n-hint: Unless your language has a different convention for ratios,
* like 8:1, leave as is.*/
mRatioText->SetLabel(wxString::Format(_("%.0f:1"), mRatio));
}
else {
mRatioLabel->SetName(wxString::Format(_("Ratio %.1f to 1"), mRatio));
/* i18n-hint: Unless your language has a different convention for ratios,
* like 8:1, leave as is.*/
mRatioText->SetLabel(wxString::Format(_("%.1f:1"), mRatio));
}
mRatioText->SetName(mRatioText->GetLabel()); // fix for bug 577 (NVDA/Narrator screen readers do not read static text in dialogs)
mAttackLabel->SetName(wxString::Format(_("Attack Time %.2f secs"), mAttackTime));
mAttackText->SetLabel(wxString::Format(_("%.2f secs"), mAttackTime));
mAttackText->SetName(mAttackText->GetLabel()); // fix for bug 577 (NVDA/Narrator screen readers do not read static text in dialogs)
mDecayLabel->SetName(wxString::Format(_("Release Time %.1f secs"), mDecayTime));
mDecayText->SetLabel(wxString::Format(_("%.1f secs"), mDecayTime));
mDecayText->SetName(mDecayText->GetLabel()); // fix for bug 577 (NVDA/Narrator screen readers do not read static text in dialogs)
mPanel->Refresh(false);
return;
}
//----------------------------------------------------------------------------
// EffectCompressorPanel
//----------------------------------------------------------------------------
BEGIN_EVENT_TABLE(EffectCompressorPanel, wxPanel)
EVT_PAINT(EffectCompressorPanel::OnPaint)
EVT_SIZE(EffectCompressorPanel::OnSize)
END_EVENT_TABLE()
EffectCompressorPanel::EffectCompressorPanel(wxWindow *parent,
double & threshold,
double & noiseFloor,
double & ratio)
: wxPanel(parent),
threshold(threshold),
noiseFloor(noiseFloor),
ratio(ratio)
{
mBitmap = NULL;
mWidth = 0;
mHeight = 0;
}
void EffectCompressorPanel::OnPaint(wxPaintEvent & WXUNUSED(evt))
{
wxPaintDC dc(this);
int width, height;
GetSize(&width, &height);
if (!mBitmap || mWidth!=width || mHeight!=height) {
if (mBitmap)
delete mBitmap;
mWidth = width;
mHeight = height;
mBitmap = new wxBitmap(mWidth, mHeight);
}
double rangeDB = 60;
// Ruler
int w = 0;
int h = 0;
Ruler vRuler;
vRuler.SetBounds(0, 0, mWidth, mHeight);
vRuler.SetOrientation(wxVERTICAL);
vRuler.SetRange(0, -rangeDB);
vRuler.SetFormat(Ruler::LinearDBFormat);
vRuler.SetUnits(_("dB"));
vRuler.GetMaxSize(&w, NULL);
Ruler hRuler;
hRuler.SetBounds(0, 0, mWidth, mHeight);
hRuler.SetOrientation(wxHORIZONTAL);
hRuler.SetRange(-rangeDB, 0);
hRuler.SetFormat(Ruler::LinearDBFormat);
hRuler.SetUnits(_("dB"));
hRuler.SetFlip(true);
hRuler.GetMaxSize(NULL, &h);
vRuler.SetBounds(0, 0, w, mHeight - h);
hRuler.SetBounds(w, mHeight - h, mWidth, mHeight);
wxColour bkgnd = GetBackgroundColour();
wxBrush bkgndBrush(bkgnd, wxSOLID);
wxMemoryDC memDC;
memDC.SelectObject(*mBitmap);
wxRect bkgndRect;
bkgndRect.x = 0;
bkgndRect.y = 0;
bkgndRect.width = w;
bkgndRect.height = mHeight;
memDC.SetBrush(bkgndBrush);
memDC.SetPen(*wxTRANSPARENT_PEN);
memDC.DrawRectangle(bkgndRect);
bkgndRect.y = mHeight - h;
bkgndRect.width = mWidth;
bkgndRect.height = h;
memDC.DrawRectangle(bkgndRect);
wxRect border;
border.x = w;
border.y = 0;
border.width = mWidth - w;
border.height = mHeight - h + 1;
memDC.SetBrush(*wxWHITE_BRUSH);
memDC.SetPen(*wxBLACK_PEN);
memDC.DrawRectangle(border);
mEnvRect = border;
mEnvRect.Deflate( 2, 2 );
int kneeX = lrint((rangeDB+threshold)*mEnvRect.width/rangeDB);
int kneeY = lrint((rangeDB+threshold/ratio)*mEnvRect.height/rangeDB);
int finalY = mEnvRect.height;
int startY = lrint((threshold*(1.0/ratio-1.0))*mEnvRect.height/rangeDB);
// Yellow line for threshold
/* memDC.SetPen(wxPen(wxColour(220, 220, 0), 1, wxSOLID));
AColor::Line(memDC,
mEnvRect.x,
mEnvRect.y + mEnvRect.height - kneeY,
mEnvRect.x + mEnvRect.width - 1,
mEnvRect.y + mEnvRect.height - kneeY);*/
// Was: Nice dark red line for the compression diagram
// memDC.SetPen(wxPen(wxColour(180, 40, 40), 3, wxSOLID));
// Nice blue line for compressor, same color as used in the waveform envelope.
memDC.SetPen( AColor::WideEnvelopePen) ;
AColor::Line(memDC,
mEnvRect.x,
mEnvRect.y + mEnvRect.height - startY,
mEnvRect.x + kneeX - 1,
mEnvRect.y + mEnvRect.height - kneeY);
AColor::Line(memDC,
mEnvRect.x + kneeX,
mEnvRect.y + mEnvRect.height - kneeY,
mEnvRect.x + mEnvRect.width - 1,
mEnvRect.y + mEnvRect.height - finalY);
// Paint border again
memDC.SetBrush(*wxTRANSPARENT_BRUSH);
memDC.SetPen(*wxBLACK_PEN);
memDC.DrawRectangle(border);
vRuler.Draw(memDC);
hRuler.Draw(memDC);
dc.Blit(0, 0, mWidth, mHeight,
&memDC, 0, 0, wxCOPY, FALSE);
}
void EffectCompressorPanel::OnSize(wxSizeEvent & WXUNUSED(evt))
{
Refresh(false);
}
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