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Add zoom functionality

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This commit is contained in:
Mike Walters
2015-06-21 23:42:00 +01:00
parent 8b64973c47
commit d740c0d8fb
2 changed files with 33 additions and 3 deletions
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28
inputsource.cpp
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@@ -30,6 +30,9 @@ InputSource::InputSource(const char *filename, int fft_size) {
for (int i = 0; i < m_fft_size; i++) {
m_window[i] = 0.5f * (1.0f - cos(M_TAU * i / (m_fft_size - 1)));
}
m_zoom = 0;
m_max_zoom = floor(log2(m_fft_size));
}
InputSource::~InputSource() {
@@ -44,7 +47,7 @@ InputSource::~InputSource() {
}
void InputSource::GetViewport(float *dest, int x, int y, int width, int height, int zoom) {
fftwf_complex *sample_ptr = &m_data[y * m_fft_size];
fftwf_complex *sample_ptr = &m_data[y * GetOverlap()];
for (int i = 0; i < height; i++) {
memcpy(m_fftw_in, sample_ptr, m_fft_size * sizeof(fftw_complex));
@@ -66,14 +69,33 @@ void InputSource::GetViewport(float *dest, int x, int y, int width, int height,
*dest = magdb;
dest++;
}
sample_ptr += m_fft_size;
sample_ptr += GetOverlap();
}
}
int InputSource::GetHeight() {
return m_file_size / sizeof(fftwf_complex) / m_fft_size;
int lines = m_file_size / sizeof(fftwf_complex) / GetOverlap();
// Force height to be a multiple of overlap size
return (lines / GetOverlap()) * GetOverlap();
}
int InputSource::GetWidth() {
return m_fft_size;
}
void InputSource::ZoomIn() {
m_zoom++;
if (m_max_zoom > m_max_zoom)
m_zoom = m_max_zoom;
}
void InputSource::ZoomOut() {
m_zoom--;
if (m_zoom < 0)
m_zoom = 0;
}
int InputSource::GetOverlap() {
int increment = m_fft_size / pow(2, m_zoom);
}