first commit

project/fm_viewer/core/rm_math.cpp

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+#include "rm_math.h"
+#include <qmath.h>
+
+float QAspectScaleFit(QSize sourceSize, QRect destRect)
+{
+    QSize destSize = destRect.size();
+    float scaleW = (float)destSize.width() / (float)sourceSize.width();
+    float scaleH = (float)destSize.height() / (float)sourceSize.height();
+    return qMin(scaleW, scaleH);
+}
+QRect QRectFRound(QRectF r)
+{
+    double xmin = floor(r.left());
+    double ymin = floor(r.top());
+
+    double width = ceil(r.width() + (r.left()-xmin));
+    double height = ceil(r.height() + (r.top()-ymin));
+    return QRect(xmin,ymin,width,height);
+}
+
+// Fit
+QRect QRectAspectFitRect(QSize sourceSize, QRect destRect)
+{
+    QSize destSize = destRect.size();
+    float destScale = QAspectScaleFit(sourceSize, destRect);
+
+    float newWidth = (float)sourceSize.width() * destScale;
+    float newHeight = (float)sourceSize.height() * destScale;
+
+    float dWidth = (((float)destSize.width() - newWidth) / 2.0f);
+    float dHeight = (((float)destSize.height() - newHeight) / 2.0f);
+
+    QRect rect = QRect(dWidth + destRect.left(), dHeight + destRect.top(), newWidth, newHeight);
+    return rect;
+}
+QRect QRectCenter(QSize sourceSize, QRect destRect)
+{
+    int xo = (destRect.width() - sourceSize.width()) / 2;
+    int yo = (destRect.height() - sourceSize.height()) / 2;
+    return QRect(destRect.left()+xo,destRect.top()+yo,sourceSize.width(),sourceSize.height());
+}
+
+QRect QRectAspectFillRect(QSize sourceSize, QRect destRect)
+{
+    QSize destSize = destRect.size();
+    float destScale = QAspectScaleFill(sourceSize, destRect);
+
+    float newWidth = (float)sourceSize.width() * destScale;
+    float newHeight = (float)sourceSize.height() * destScale;
+
+    float dWidth = (((float)destSize.width() - newWidth) / 2.0f);
+    float dHeight = (((float)destSize.height() - newHeight) / 2.0f);
+
+    // l,t,r,b
+    QRect rect = QRect(dWidth + destRect.left(), dHeight + destRect.top(), newWidth, newHeight);
+    return rect;
+}
+float QAspectScaleFill(QSize sourceSize, QRect destRect)
+{
+    QSize destSize = destRect.size();
+    float scaleW = (float)destSize.width() / (float)sourceSize.width();
+    float scaleH = (float)destSize.height() / (float)sourceSize.height();
+    return qMax(scaleW, scaleH);
+}