Flesh out Qt port a bit more

spectrogram.cpp

@@ -0,0 +1,45 @@
+#include "spectrogram.h"
+
+#include <QPainter>
+#include <QPaintEvent>
+#include <QRect>
+
+Spectrogram::Spectrogram()
+{
+	inputSource = new InputSource("/home/mike/Downloads/hubsan-chopped.cfile", 1024);
+	resize(inputSource->GetWidth(), inputSource->GetHeight());
+}
+
+Spectrogram::~Spectrogram()
+{
+	delete inputSource;
+}
+
+void Spectrogram::paintEvent(QPaintEvent *event)
+{
+	QRect rect = event->rect();
+	QPainter painter(this);
+	painter.fillRect(rect, Qt::black);
+
+	if (inputSource != nullptr) {
+		int width = inputSource->GetWidth();
+		int height = rect.height();
+
+		float *data = (float*)malloc(width * height * sizeof(float));
+
+		inputSource->GetViewport(data, 0, rect.y(), width, height, 0);
+
+		QImage image(width, height, QImage::Format_RGB32);
+		for (int y = 0; y < height; y++) {
+			for (int x = 0; x < width; x++) {
+				uint8_t pixel = data[y*width + x] * -3;
+				image.setPixel(x, y, qRgb(0, 0, pixel));
+			}
+		}
+
+		QPixmap pixmap = QPixmap::fromImage(image);
+		painter.drawPixmap(QRect(0, rect.y(), width, height), pixmap);
+
+		free(data);
+	}
+}