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WaveFftView.cpp
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// Copyright Alexander Grigoriev, 1997-2002, All Rights Reserved
// WaveFftView.cpp : implementation file
//
#include "stdafx.h"
#include "WaveSoapFront.h"
#include "WaveSoapFrontView.h"
#include "WaveFftView.h"
#include "fft.h"
#include "MainFrm.h"
#include "GdiObjectSave.h"
#include "resource.h" // main symbols
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
static const unsigned char palette[128 * 3] =
{
255, 254, 248,
251, 254, 244,
247, 254, 240,
243, 254, 236,
244, 254, 236,
245, 254, 236,
244, 254, 230,
242, 254, 224,
241, 254, 215,
241, 254, 213,
240, 254, 208,
241, 254, 203,
241, 254, 197,
242, 254, 192,
243, 254, 186,
245, 254, 181,
247, 254, 176,
249, 254, 171,
252, 254, 165,
254, 253, 160,
254, 249, 155,
254, 245, 150,
254, 241, 145,
254, 236, 140,
254, 232, 135,
254, 226, 130,
254, 221, 125,
254, 215, 120,
253, 208, 115,
253, 202, 110,
253, 195, 105,
253, 187, 100,
253, 180, 95,
253, 172, 91,
253, 164, 86,
253, 155, 81,
253, 146, 77,
253, 137, 72,
253, 128, 67,
253, 118, 63,
252, 108, 58,
252, 98, 54,
252, 87, 49,
252, 76, 45,
252, 65, 40,
252, 54, 36,
252, 42, 31,
252, 30, 27,
252, 23, 28,
251, 19, 32,
251, 14, 36,
251, 10, 41,
251, 6, 46,
250, 3, 52,
245, 3, 59,
241, 3, 66,
237, 3, 74,
233, 3, 80,
229, 3, 87,
225, 3, 93,
221, 3, 99,
217, 3, 105,
213, 3, 110,
209, 3, 115,
205, 3, 120,
201, 3, 125,
197, 3, 129,
193, 3, 133,
190, 3, 137,
186, 3, 141,
182, 3, 144,
178, 3, 147,
175, 3, 150,
171, 3, 153,
168, 3, 156,
164, 3, 158,
161, 3, 160,
152, 3, 157,
144, 3, 154,
135, 3, 150,
127, 3, 147,
119, 3, 144,
112, 3, 140,
105, 3, 137,
98, 2, 134,
91, 2, 131,
84, 2, 128,
78, 2, 125,
72, 2, 121,
66, 2, 118,
61, 2, 115,
55, 2, 113,
50, 2, 110,
45, 2, 107,
40, 2, 104,
45, 2, 107,
36, 2, 101,
31, 2, 98,
27, 2, 96,
23, 2, 93,
20, 2, 90,
16, 2, 88,
13, 2, 85,
10, 2, 83,
7, 2, 80,
4, 2, 78,
2, 2, 76,
2, 5, 73,
1, 9, 69,
0, 11, 67,
0, 13, 64,
0, 15, 62,
0, 16, 60,
0, 18, 58,
0, 19, 56,
0, 20, 54,
0, 21, 53,
0, 22, 51,
0, 23, 49,
0, 24, 47,
0, 25, 46,
0, 26, 41,
0, 27, 40,
0, 28, 36,
0, 27, 25,
0, 27, 15,
0, 27, 5,
0, 0, 0,
};
struct RgnData
{
ATL::CHeapPtr<RGNDATAHEADER> hdr;
RgnData(int InitialNumberOfRects = 16);
void AddRect(int left, int top, int right, int bottom);
bool Allocate(int NumberOfRects);
operator RGNDATA*() { return CONTAINING_RECORD(PRGNDATAHEADER(hdr), RGNDATA, rdh); }
BOOL GetRegionData(CRgn const * rgn);
int AllocatedNumberOfRects;
RECT* begin()
{
return (RECT*)((operator RGNDATA*())->Buffer);
}
RECT* end()
{
return begin()+hdr->nCount;
}
RECT & operator[](int n)
{
ASSERT(n < AllocatedNumberOfRects);
ASSERT(n <= (int)hdr->nCount);
return begin()[n];
}
};
RgnData::RgnData(int InitialNumberOfRects)
:AllocatedNumberOfRects(-1)
{
Allocate(InitialNumberOfRects);
hdr->dwSize = sizeof *hdr;
hdr->iType = RDH_RECTANGLES;
hdr->nCount = 0;
hdr->nRgnSize = sizeof *hdr;
hdr->rcBound.top = 0;
hdr->rcBound.bottom = 0;
hdr->rcBound.left = 0;
hdr->rcBound.right = 0;
}
void RgnData::AddRect(int left, int top, int right, int bottom)
{
if ((int)hdr->nCount < AllocatedNumberOfRects)
{
RECT * rect = begin() + hdr->nCount;
rect->left = left;
rect->top = top;
rect->right = right;
rect->bottom = bottom;
if (hdr->nCount == 0)
{
hdr->rcBound = rect[0];
}
else
{
if (hdr->rcBound.left > left)
{
hdr->rcBound.left = left;
}
if (hdr->rcBound.right < right)
{
hdr->rcBound.right = right;
}
if (hdr->rcBound.top > top)
{
hdr->rcBound.top = top;
}
if (hdr->rcBound.bottom < bottom)
{
hdr->rcBound.bottom = bottom;
}
}
hdr->nCount++;
hdr->nRgnSize += sizeof (RECT);
}
}
bool RgnData::Allocate(int NumberOfRects)
{
if (AllocatedNumberOfRects >= NumberOfRects)
{
return true;
}
if (!hdr.ReallocateBytes(sizeof (RGNDATAHEADER) + sizeof (RECT) * NumberOfRects))
{
return false;
}
AllocatedNumberOfRects = NumberOfRects;
return true;
}
BOOL RgnData::GetRegionData(CRgn const * rgn)
{
int RequiredBytes = rgn->GetRegionData(NULL, 0);
if (!hdr.ReallocateBytes(RequiredBytes))
{
return FALSE;
}
AllocatedNumberOfRects = (RequiredBytes - sizeof(RGNDATAHEADER)) / sizeof(RECT);
return rgn->GetRegionData(*this, RequiredBytes) != 0;
}
namespace
{
// It's assumed the rectangles are normalized (right <= left)
static bool rect_less(RECT const& r1, RECT const& r2)
{
if (r1.left < r2.left)
{
return true;
}
if (r1.left > r2.left)
{
return false;
}
if (r1.right < r2.right)
{
return true;
}
if (r1.right > r2.right)
{
return false;
}
if (r1.top < r2.top)
{
return true;
}
if (r1.top > r2.top)
{
return false;
}
if (r1.bottom < r2.bottom)
{
return true;
}
//if (r1.bottom > r2.bottom)
{
}
return false;
}
static bool rect_left_less(RECT const& r1, RECT const& r2)
{
return r1.left < r2.left;
}
}
/////////////////////////////////////////////////////////////////////////////
// CWaveFftView
IMPLEMENT_DYNCREATE(CWaveFftView, CView);
CWaveFftView::CWaveFftView()
: m_pFftResultArray(NULL),
m_FftResultArrayWidth(0),
m_FftResultArrayHeight(0),
m_VisibleBottom(0),
m_FftWindowType(GetApp()->m_FftWindowType),
m_IndexOfFftBegin(0),
m_PrevSelectionEnd(0),
m_PrevSelectionStart(0),
m_PrevSelectedChannel(0),
m_VerticalScale(1.)
, m_FftArrayBusyMask(0)
, m_AllocatedFftBufSize(0)
, m_FftWindowValid(false)
#ifdef _DEBUG
, m_DrawingBeginTime(0)
#endif
{
m_FftOrder = 1 << GetApp()->m_FftBandsOrder;
m_FftSpacing = m_FftOrder;
#if 0 && defined(_DEBUG)
// verify FFT functions
typedef float data;
int const num_bands = 8;
data real_src[num_bands*2];
std::complex<data> complex_src[num_bands];
std::complex<data> complex_dst[num_bands + 1];
for (int f = 0; f < num_bands; f++)
{
for (int i = 0; i < countof(real_src); i++)
{
real_src[i] = cos(M_PI * 2 * f * i / countof(real_src));
}
FastFourierTransform(real_src, complex_dst, countof(real_src));
for (int i = 0; i < countof(real_src); i++)
{
real_src[i] = sin(M_PI * 2 * (f + 1) * i / countof(real_src));
}
FastFourierTransform(real_src, complex_dst, countof(real_src));
}
#endif
}
CWaveFftView::~CWaveFftView()
{
delete[] m_pFftResultArray;
m_pFftResultArray = NULL;
}
BEGIN_MESSAGE_MAP(CWaveFftView, BaseClass)
//{{AFX_MSG_MAP(CWaveFftView)
ON_COMMAND(ID_VIEW_ZOOMVERT_NORMAL, OnViewZoomvertNormal)
ON_COMMAND(ID_VIEW_ZOOMINVERT, OnViewZoomInVert)
ON_COMMAND(ID_VIEW_ZOOMOUTVERT, OnViewZoomOutVert)
ON_WM_PAINT()
ON_WM_ERASEBKGND()
ON_COMMAND_RANGE(ID_FFT_BANDS_32, ID_FFT_BANDS_16384, OnFftBands)
ON_UPDATE_COMMAND_UI_RANGE(ID_FFT_BANDS_64, ID_FFT_BANDS_16384, OnUpdateFftBands)
ON_COMMAND(ID_FFT_WINDOW_SQUARED_SINE, OnFftWindowSquaredSine)
ON_UPDATE_COMMAND_UI(ID_FFT_WINDOW_SQUARED_SINE, OnUpdateFftWindowSquaredSine)
ON_COMMAND(ID_FFT_WINDOW_SINE, OnFftWindowSine)
ON_UPDATE_COMMAND_UI(ID_FFT_WINDOW_SINE, OnUpdateFftWindowSine)
ON_COMMAND(ID_FFT_WINDOW_HAMMING, OnFftWindowHamming)
ON_UPDATE_COMMAND_UI(ID_FFT_WINDOW_HAMMING, OnUpdateFftWindowHamming)
ON_COMMAND(ID_FFT_WINDOW_NUTTALL, OnFftWindowNuttall)
ON_UPDATE_COMMAND_UI(ID_FFT_WINDOW_NUTTALL, OnUpdateFftWindowNuttall)
ON_COMMAND(ID_VIEW_DECREASE_FFT_BANDS, OnViewDecreaseFftBands)
ON_COMMAND(ID_VIEW_INCREASE_FFT_BANDS, OnViewIncreaseFftBands)
//}}AFX_MSG_MAP
ON_COMMAND(ID_VIEW_SS_ZOOMINVERT, OnViewZoomInVert)
ON_UPDATE_COMMAND_UI(ID_VIEW_SS_ZOOMINVERT, OnUpdateViewZoomInVert)
ON_COMMAND(ID_VIEW_SS_ZOOMOUTVERT, OnViewZoomOutVert)
ON_UPDATE_COMMAND_UI(ID_VIEW_SS_ZOOMOUTVERT, OnUpdateViewZoomOutVert)
ON_COMMAND(ID_VIEW_SS_ZOOMVERT_NORMAL, OnViewZoomvertNormal)
ON_UPDATE_COMMAND_UI(ID_VIEW_SS_ZOOMVERT_NORMAL, OnUpdateViewZoomvertNormal)
ON_MESSAGE(UWM_NOTIFY_VIEWS, &CWaveFftView::OnUwmNotifyViews)
ON_WM_CONTEXTMENU()
END_MESSAGE_MAP()
static int fround(double d)
{
if (d >= 0.)
{
return int(d + 0.5);
}
else
{
return int(d - 0.5);
}
}
SAMPLE_INDEX CWaveFftView::SampleToFftBaseSample(SAMPLE_INDEX sample) const
{
sample += m_FftOrder;
return sample & -m_FftSpacing;
}
// the base sample corresponds to the FFT center
SAMPLE_INDEX CWaveFftView::DisplaySampleToFftBaseSample(SAMPLE_INDEX sample) const
{
sample += m_FftSpacing >> 1;
return sample & -m_FftSpacing;
}
// display sample to FftColumn
inline long CWaveFftView::DisplaySampleToFftColumn(SAMPLE_INDEX sample) const
{
return sample / m_FftSpacing;
}
// to calculate the first column to be invalidated. The sample belongs to this column and possibly next
long CWaveFftView::SampleToFftColumnLowerBound(SAMPLE_INDEX sample) const
{
long column = (sample - m_FftOrder - m_FftSpacing / 2) / m_FftSpacing;
if (column < 0)
{
return 0;
}
return column;
}
// to calculate the last column to be invalidated. The sample belongs to this column and possibly before it
long CWaveFftView::SampleToFftColumnUpperBound(SAMPLE_INDEX sample) const
{
if (sample >= LONG_MAX - m_FftOrder)
{
return LONG_MAX / m_FftSpacing - 1;
}
return (sample + m_FftOrder - m_FftSpacing / 2) / m_FftSpacing;
}
// the display columns divided at m_FftSpacing/2
// this returns the left boundary of the band
SAMPLE_INDEX CWaveFftView::FftColumnToDisplaySample(long Column) const
{
if (Column == 0)
{
return 0;
}
return Column * m_FftSpacing - m_FftSpacing / 2;
}
void CWaveFftView::InvalidateFftColumnRange(long first_column, long last_column) // including last
{
if (NULL == m_pFftResultArray)
{
return;
}
if (first_column < m_FirstFftColumn)
{
first_column = m_FirstFftColumn;
}
if (last_column >= m_FirstFftColumn + m_FftResultArrayWidth)
{
last_column = m_FirstFftColumn + m_FftResultArrayWidth - 1;
}
for (long i = first_column; i <= last_column; i++)
{
m_pFftResultArray[((m_IndexOfFftBegin + i + m_FftResultArrayWidth - m_FirstFftColumn) % m_FftResultArrayWidth) * m_FftResultArrayHeight] = 0;
}
}
bool CWaveFftView::IsFftResultCalculated(long FftColumn) const
{
// see if it's within the array
ASSERT(FftColumn >= m_FirstFftColumn && FftColumn < m_FirstFftColumn + m_FftResultArrayWidth);
float const * pFftColumn = m_pFftResultArray +
m_FftResultArrayHeight * ((m_IndexOfFftBegin + FftColumn - m_FirstFftColumn) % m_FftResultArrayWidth);
return pFftColumn[0] == 1;
}
float const * CWaveFftView::GetFftResult(long FftColumn, unsigned channel)
{
ThisDoc * pDoc = GetDocument();
// see if it's within the array
ASSERT(FftColumn >= m_FirstFftColumn && FftColumn < m_FirstFftColumn + m_FftResultArrayWidth);
float * pFftColumn = m_pFftResultArray +
m_FftResultArrayHeight * ((m_IndexOfFftBegin + FftColumn - m_FirstFftColumn) % m_FftResultArrayWidth);
if (pFftColumn[0] == 1)
{
return pFftColumn + 1 + channel * m_FftOrder;
}
if (pFftColumn[0] == 127)
{
return NULL;
}
NUMBER_OF_CHANNELS nChannels = GetDocument()->WaveChannels();
SAMPLE_INDEX FirstSampleRequired = FftColumn * m_FftSpacing + m_FftSpacing / 2 - m_FftOrder;
if (FirstSampleRequired < 0)
{
FirstSampleRequired = 0;
}
// calculate the FFT for this column
if (FirstSampleRequired + m_FftOrder * 2 > GetDocument()->WaveFileSamples()
|| FirstSampleRequired < 0)
{
if (0) TRACE("The required samples from %d to %d are out of the file\n",
FirstSampleRequired, FirstSampleRequired + m_FftOrder);
pFftColumn[0] = 0; // mark as invalid
// make all black
return NULL;
}
float * pFftBuf = NULL;
unsigned FFtBufIdx;
ULONG_PTR FFtBufMask;
for (FFtBufIdx = 0; ; FFtBufIdx = (FFtBufIdx + 1) % (sizeof(ULONG_PTR)*8))
{
ASSERT(~m_FftArrayBusyMask != 0);
FFtBufMask = (ULONG_PTR)1 << FFtBufIdx;
if (0 == (FFtBufMask & m_FftArrayBusyMask.Exchange_Or(FFtBufMask)))
{
break;
}
}
if (!m_FftBuf[FFtBufIdx])
{
m_FftBuf[FFtBufIdx].Allocate(m_FftOrder * 2 + 2);
}
pFftBuf = m_FftBuf[FFtBufIdx];
if (!pFftBuf)
{
return NULL;
}
#ifdef _DEBUG
m_NumberOfFftCalculated++;
#endif
float * pRes = pFftColumn + 1;
long const NeedSamples = m_FftOrder * 2;
for (int ch = 0; ch < nChannels; ch++, pRes += m_FftOrder)
{
if (NeedSamples != pDoc->m_WavFile.ReadSamples(1 << ch, pDoc->m_WavFile.SampleToPosition(FirstSampleRequired),
NeedSamples, pFftBuf, SampleTypeFloat32))
{
pFftColumn[0] = 0;
m_FftArrayBusyMask &= ~FFtBufMask;
return NULL;
}
for (int k = 0; k < NeedSamples; k++)
{
pFftBuf[k] *= m_pFftWindow[k];
}
FastFourierTransform(pFftBuf, reinterpret_cast<std::complex<float> *>(pFftBuf),
m_FftOrder * 2);
for (int i = 0, k = 0; i < m_FftOrder; i++, k += 2)
{
pRes[i] = float(pFftBuf[k] * pFftBuf[k] + pFftBuf[k + 1] * pFftBuf[k + 1]);
}
}
m_FftArrayBusyMask &= ~FFtBufMask;
pFftColumn[0] = 1; // mark as valid
return pFftColumn + 1 + channel * m_FftOrder;
}
void CWaveFftView::FillLogPalette(LOGPALETTE * pal, int nEntries)
{
pal->palVersion = 0x300;
int i;
for (i = 0; i < 10; i++)
{
pal->palPalEntry[i].peFlags = PC_EXPLICIT;
pal->palPalEntry[i].peRed = (BYTE)i;
pal->palPalEntry[i].peGreen = 0;
pal->palPalEntry[i].peBlue = 0;
}
for (unsigned j = 0; j < sizeof palette && i < nEntries; j += 3, i++)
{
pal->palPalEntry[i].peFlags = PC_NOCOLLAPSE;
pal->palPalEntry[i].peRed = palette[j];
pal->palPalEntry[i].peGreen = palette[j + 1];
pal->palPalEntry[i].peBlue = palette[j + 2];
}
pal->palNumEntries = (WORD)i;
}
/////////////////////////////////////////////////////////////////////////////
// CWaveFftView drawing
namespace
{
struct FftGraphBand
{
int y; // bottom of band
int NumDisplayRows;
int FftBand;
int NumBandsToSum;
};
}
struct DrawFftWorkItem : WorkerThreadPoolItem
{
CWaveFftView * pView;
float const**FftResultVector;
union
{
struct
{
long FirstFftColumn;
long FftColumns[16];
int NumFftColumns;
} Fft;
struct
{
int x_left;
int x_right;
unsigned char* pColBmp;
int stride;
int FirstFftColumnWidth; // first column to draw may have partial width
int FftColumnWidth; // width of all other columns
FftGraphBand const * pId;
RGBQUAD const * pColor; // palette
double PowerLogToPalIndex;
int update_top;
int update_bottom;
} Bmp;
};
};
bool CWaveFftView::CalculateFftColumnWorkitem(WorkerThreadPoolItem * pItem)
{
DrawFftWorkItem * pDrawItem = static_cast<DrawFftWorkItem *>(pItem);
for (int i = 0; i < pDrawItem->Fft.NumFftColumns; i++)
{
pDrawItem->FftResultVector[pDrawItem->Fft.FftColumns[i] - pDrawItem->Fft.FirstFftColumn]
= pDrawItem->pView->GetFftResult(pDrawItem->Fft.FftColumns[i], 0);
}
pDrawItem->Fft.NumFftColumns = 0;
return true;
}
bool CWaveFftView::FillChannelFftColumnWorkitem(WorkerThreadPoolItem * pItem)
{
DrawFftWorkItem * pDrawItem = static_cast<DrawFftWorkItem *>(pItem);
pDrawItem->pView->FillChannelFftColumn(pDrawItem);
return true;
}
void CWaveFftView::FillChannelFftColumn(DrawFftWorkItem * pDrawItem)
{
int stride = pDrawItem->Bmp.stride;
double PowerLogToPalIndex = pDrawItem->Bmp.PowerLogToPalIndex;
int update_top = pDrawItem->Bmp.update_top;
int update_bottom = pDrawItem->Bmp.update_bottom;
FftGraphBand const * pId = pDrawItem->Bmp.pId;
for (int ff = 0; ff < m_FftOrder; ff++, pId++)
{
if (pId->NumBandsToSum == 0)
{
break;
}
// the graph band array is filled from bottom to top
// valid_top to valid_bottom is exclided from update
if (pId->y + pId->NumDisplayRows <= update_top)
{
// this band is in the area not to update
break;
}
if (pId->y >= update_bottom)
{
// this band is in the area not to update
continue;
}
int NumPixelsAcross = pDrawItem->Bmp.FirstFftColumnWidth;
for (int x = pDrawItem->Bmp.x_left, i = 0; x < pDrawItem->Bmp.x_right; x += NumPixelsAcross, i++, NumPixelsAcross = pDrawItem->Bmp.FftColumnWidth)
{
BYTE * pRgb = pDrawItem->Bmp.pColBmp + pId->y * stride + x * 3;
if (x + NumPixelsAcross > pDrawItem->Bmp.x_right)
{
NumPixelsAcross = pDrawItem->Bmp.x_right - x;
}
unsigned char red = 0;
unsigned char g = 0;
unsigned char b = 0;
float const * pData = pDrawItem->FftResultVector[i];
if (pData != NULL)
{
float sum = 0.;
for (int f = pId->FftBand; f < pId->FftBand + pId->NumBandsToSum; f++)
{
sum += pData[f];
}
sum /= pId->NumBandsToSum;
int PaletteIndex = 255;
if (sum != 0.)
{
// max power= (32768 * m_FftOrder * 2) ^ 2
PaletteIndex = int(PowerLogToPalIndex * -log(sum));
if (PaletteIndex < 0)
{
PaletteIndex = 0;
}
else if (PaletteIndex > 255)
{
PaletteIndex = 255;
}
}
RGBQUAD const * pColor = &pDrawItem->Bmp.pColor[PaletteIndex];
// set the color to pId->nNumOfRows rows
red = pColor->rgbRed;
g = pColor->rgbGreen;
b = pColor->rgbBlue;
}
#ifdef _DEBUG
m_NumberOfPixelsSet += pId->NumDisplayRows * NumPixelsAcross;
#endif
for (int y = 0; y < pId->NumDisplayRows; y++, pRgb += stride)
{
// set the color to nColumns pixels across
BYTE * pRowRgb = pRgb;
for (int xx = 0; xx < NumPixelsAcross; xx++, pRowRgb += 3)
{
pRowRgb[0] = b; // B
pRowRgb[1] = g; // G
pRowRgb[2] = red; // R
}
}
}
}
}
bool CWaveFftView::FillFftColumnPaletteWorkitem(WorkerThreadPoolItem * pItem)
{
DrawFftWorkItem * pDrawItem = static_cast<DrawFftWorkItem *>(pItem);
pDrawItem->pView->FillFftColumnPalette(pDrawItem);
return true;
}
void CWaveFftView::FillFftColumnPalette(DrawFftWorkItem * pDrawItem)
{
int stride = pDrawItem->Bmp.stride;
double PowerLogToPalIndex = pDrawItem->Bmp.PowerLogToPalIndex;
int update_top = pDrawItem->Bmp.update_top;
int update_bottom = pDrawItem->Bmp.update_bottom;
FftGraphBand const * pId = pDrawItem->Bmp.pId;
for (int ff = 0; ff < m_FftOrder; ff++, pId++)
{
if (pId->NumBandsToSum == 0)
{
break;
}
// the graph band array is filled from bottom to top
// valid_top to valid_bottom is exclided from update
if (pId->y + pId->NumDisplayRows <= update_top)
{
// this band is in the area not to update
break;
}
if (pId->y >= update_bottom)
{
// this band is in the area not to update
continue;
}
int NumPixelsAcross = pDrawItem->Bmp.FirstFftColumnWidth;
for (int x = pDrawItem->Bmp.x_left, i = 0; x < pDrawItem->Bmp.x_right; x += NumPixelsAcross, i++, NumPixelsAcross = pDrawItem->Bmp.FftColumnWidth)
{
BYTE * pPal = pDrawItem->Bmp.pColBmp + pId->y * stride + x;
if (x + NumPixelsAcross > pDrawItem->Bmp.x_right)
{
NumPixelsAcross = pDrawItem->Bmp.x_right - x;
}
unsigned char ColorIndex = 0;
float const * pData = pDrawItem->FftResultVector[i];
if (pData != NULL)
{
float sum = 0.;
for (int f = pId->FftBand; f < pId->FftBand + pId->NumBandsToSum; f++)
{
sum += pData[f];
}
sum /= pId->NumBandsToSum;
int PaletteIndex = 127;
if (sum != 0.)
{
PaletteIndex = int(PowerLogToPalIndex * -log(sum));
if (PaletteIndex < 0)
{
PaletteIndex = 0;
}
else if (PaletteIndex > 127)
{
PaletteIndex = 127;
}
}
PaletteIndex += 10;
}
#ifdef _DEBUG
m_NumberOfPixelsSet += pId->NumDisplayRows * NumPixelsAcross;
#endif
// set the color to pId->nNumOfRows rows
for (int y = 0; y < pId->NumDisplayRows; y++, pPal += stride)
{
// set the color to nColumns pixels across
for (int xx = 0; xx < NumPixelsAcross; xx++)
{
pPal[xx] = ColorIndex;
}
}
}
}
}
void CWaveFftView::OnDraw(CPaintDC* pDC, CRgn * UpdateRgn)
{
CWaveSoapFrontDoc* pDoc = GetDocument();
if (! pDoc->m_WavFile.IsOpen())
{
return;
}
CRect r(pDC->m_ps.rcPaint); // paint rectangle
CRect cr; // client rectangle
GetClientRect( & cr);
// limit right to the file area
int FileEnd = SampleToXceil(pDoc->WaveFileSamples());
if (r.right > FileEnd)
{
r.right = FileEnd;
}
double left = WindowXtoSample(r.left); // (fractional) sample corresponding to r.left
//double right = WindowXtoSample(r.right); // (fractional) sample corresponding to r.right
if (left < 0) left = 0;
if (r.left >= r.right)
{
return;
}
#ifdef _DEBUG
m_NumberOfColumnsSet += r.right - r.left;
#endif
int NewFftSpacing = m_FftOrder / 4;
if (NewFftSpacing < m_HorizontalScale)
{
NewFftSpacing = (int)m_HorizontalScale;
}
AllocateFftArray((SAMPLE_INDEX)WindowXtoSample(cr.left) / NewFftSpacing,
((SAMPLE_INDEX)WindowXtoSample(cr.right) + NewFftSpacing - 1) / NewFftSpacing, NewFftSpacing); // full width of the client area at least
if (!m_FftWindowValid)
{
if (!m_pFftWindow)
{
m_pFftWindow.Allocate(m_FftOrder * 2);
}
for (int w = 0; w < m_FftOrder * 2; w++)
{
// X changes from 0 to 2pi
double X = (w + 0.5) * M_PI / m_FftOrder;
switch (m_FftWindowType)
{
default:
case WindowTypeSquaredSine:
// squared sine
m_pFftWindow[w] = float((0.5 - 0.5 * cos(X))
/ (m_FftOrder * 0.46518375880479441036888825236993));
break;
case WindowTypeHalfSine:
// half sine
m_pFftWindow[w] = float((0.707107 * sin (0.5 * X))
/ (m_FftOrder * 0.34132424511039137114306807472343));
break;
case WindowTypeHamming:
// Hamming window (sucks!!!)
m_pFftWindow[w] = float((0.9 * (0.54 - 0.46 * cos (X)))
/ (m_FftOrder * 0.44467411795859108283066893223012));
break;
case WindowTypeNuttall:
// Nuttall window:
// w(n) = 0.355768 – 0.487396*cos(2pn/N) + 0.144232*cos(4pn/N) – 0.012604*cos(6pn/N)
m_pFftWindow[w] = float((0.355768 - 0.487396*cos(X) + 0.144232*cos(2 * X) - 0.012604*cos(3 * X))
/ (m_FftOrder * 0.34132424511039137114306807472343));
break;
}
}
m_FftWindowValid = true;
}
void * pBits;
bool bUsePalette;
unsigned width = r.right - r.left;
long height = cr.bottom - cr.top;
unsigned stride = (width * 3 + 3) & ~3;
unsigned BmpSize = stride * height;
int BytesPerPixel = 3;
double DbRange = 130. + 10. * log10(m_FftOrder / 512.);
if (pDoc->m_WavFile.GetSampleType() == SampleType16bit)
{
DbRange -= 10.;
}
double PowerLogToPalIndex;
struct BM
{
BITMAPINFO bmi;
RGBQUAD MorebmiColors[256];
} bmi = {sizeof (BITMAPINFOHEADER) };
bmi.bmi.bmiHeader.biSize = sizeof (BITMAPINFOHEADER);
bmi.bmi.bmiHeader.biWidth = width;
bmi.bmi.bmiHeader.biHeight = -height; // this will be top-down bitmap, with origin in top left
bmi.bmi.bmiHeader.biPlanes = 1;
bmi.bmi.bmiHeader.biCompression = BI_RGB;
bmi.bmi.bmiHeader.biSizeImage = 0;
bmi.bmi.bmiHeader.biXPelsPerMeter = 0;
bmi.bmi.bmiHeader.biYPelsPerMeter = 0;
bmi.bmi.bmiHeader.biClrUsed = 0;
bmi.bmi.bmiHeader.biClrImportant = 0;
CPushDcPalette OldPalette(pDC, NULL);
if ((pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE)
&& 8 == pDC->GetDeviceCaps(BITSPIXEL))
{
BytesPerPixel = 1;
bUsePalette = true;
bmi.bmi.bmiHeader.biBitCount = 8;
int i;
PALETTEENTRY SysPalette[256];
GetSystemPaletteEntries(*pDC, 0, 256, SysPalette);
for (i = 0; i < 10; i++)
{
bmi.bmi.bmiColors[i].rgbReserved = 0;
bmi.bmi.bmiColors[i].rgbRed = SysPalette[i].peRed;
bmi.bmi.bmiColors[i].rgbGreen = SysPalette[i].peGreen;
bmi.bmi.bmiColors[i].rgbBlue = SysPalette[i].peBlue;
}
for (int j = 0; j < sizeof palette && i < 255; j += 3, i++)
{
bmi.bmi.bmiColors[i].rgbReserved = 0;
bmi.bmi.bmiColors[i].rgbRed = palette[j];
bmi.bmi.bmiColors[i].rgbGreen = palette[j + 1];
bmi.bmi.bmiColors[i].rgbBlue = palette[j + 2];
}
for ( ; i < 256; i++)
{
bmi.bmi.bmiColors[i].rgbReserved = 0;
bmi.bmi.bmiColors[i].rgbRed = SysPalette[i].peRed;
bmi.bmi.bmiColors[i].rgbGreen = SysPalette[i].peGreen;
bmi.bmi.bmiColors[i].rgbBlue = SysPalette[i].peBlue;
}
bmi.bmi.bmiHeader.biClrUsed = i;
stride = (width + 3) & ~3;
BmpSize = stride * height;
OldPalette.PushPalette(GetApp()->GetPalette(), FALSE);
PowerLogToPalIndex = 127 / (DbRange / 10. * log(10.));
}
else