CGHelpers.hxx

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#ifndef INCLUDED_VCL_INC_QUARTZ_CGHELPER_HXX
#define INCLUDED_VCL_INC_QUARTZ_CGHELPER_HXX
 
#include <premac.h>
#include <CoreGraphics/CoreGraphics.h>
#include <postmac.h>
 
#include <quartz/utils.h>
 
class CGLayerHolder
{
private:
    CGLayerRef mpLayer;
 
    // Layer's scaling factor
    float mfScale;
 
public:
    CGLayerHolder()
        : mpLayer(nullptr)
        , mfScale(1.0)
    {
    }
 
    CGLayerHolder(CGLayerRef pLayer, float fScale = 1.0)
        : mpLayer(pLayer)
        , mfScale(fScale)
    {
    }
 
    // Just the size of the layer in pixels
    CGSize getSizePixels() const
    {
        CGSize aSize;
        if (mpLayer)
        {
            aSize = CGLayerGetSize(mpLayer);
        }
        return aSize;
    }
 
    // Size in points is size in pixels divided by the scaling factor
    CGSize getSizePoints() const
    {
        CGSize aSize;
        if (mpLayer)
        {
            const CGSize aLayerSize = getSizePixels();
            aSize.width = aLayerSize.width / mfScale;
            aSize.height = aLayerSize.height / mfScale;
        }
        return aSize;
    }
 
    CGLayerRef get() const { return mpLayer; }
 
    bool isSet() const { return mpLayer != nullptr; }
 
    void set(CGLayerRef const& pLayer) { mpLayer = pLayer; }
 
    float getScale() const { return mfScale; }
 
    void setScale(float fScale) { mfScale = fScale; }
};
 
class CGContextHolder
{
private:
    CGContextRef mpContext;
 
public:
    CGContextHolder()
        : mpContext(nullptr)
    {
    }
 
    CGContextHolder(CGContextRef pContext)
        : mpContext(pContext)
    {
    }
 
    CGContextRef get() const { return mpContext; }
 
    bool isSet() const { return mpContext != nullptr; }
 
    void set(CGContextRef const& pContext) { mpContext = pContext; }
 
    void saveState() { CGContextSaveGState(mpContext); }
 
    void restoreState() { CGContextRestoreGState(mpContext); }
};
 
#endif // INCLUDED_VCL_INC_QUARTZ_CGHELPER_HXX
 
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