Quelle  QtSvpSurface.cxx

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#include <utility>

#include <QtSvpSurface.hxx>

#include <QtSvpGraphics.hxx>

#include <vcl/sysdata.hxx>
#include <vcl/virdev.hxx>

namespace
{
Size get_surface_size(cairo_surface_t* surface)
{
    cairo_t* cr = cairo_create(surface);
    double x1, x2, y1, y2;
    cairo_clip_extents(cr, &x1, &y1, &x2, &y2);
    cairo_destroy(cr);
    return Size(x2 - x1, y2 - y1);
}
}

namespace cairo
{
QtSvpSurface::QtSvpSurface(CairoSurfaceSharedPtr pSurface)
    : m_pGraphics(nullptr)
    , m_pCairoContext(nullptr)
    , m_pSurface(std::move(pSurface))
{
}

QtSvpSurface::QtSvpSurface(const QtSvpGraphics* pGraphics, int x, int y, int width, int height)
    : m_pGraphics(pGraphics)
    , m_pCairoContext(pGraphics->getCairoContext())
{
    cairo_surface_t* surface = cairo_get_target(m_pCairoContext);
    m_pSurface.reset(cairo_surface_create_for_rectangle(surface, x, y, width, height),
                     &cairo_surface_destroy);
}

QtSvpSurface::~QtSvpSurface()
{
    if (m_pCairoContext)
        cairo_destroy(m_pCairoContext);
}

CairoSharedPtr QtSvpSurface::getCairo() const
{
    return CairoSharedPtr(cairo_create(m_pSurface.get()), &cairo_destroy);
}

SurfaceSharedPtr QtSvpSurface::getSimilar(int cairo_content_type, int width, int height) const
{
    return std::make_shared<QtSvpSurface>(CairoSurfaceSharedPtr(
        cairo_surface_create_similar(
            m_pSurface.get(), static_cast<cairo_content_t>(cairo_content_type), width, height),
        &cairo_surface_destroy));
}

void QtSvpSurface::flush() const
{
    cairo_surface_flush(m_pSurface.get());
    if (m_pGraphics)
        m_pGraphics->updateQWidget();
}

VclPtr<VirtualDevice> QtSvpSurface::createVirtualDevice() const
{
    SystemGraphicsData aSystemGraphicsData;

    aSystemGraphicsData.nSize = sizeof(SystemGraphicsData);
    aSystemGraphicsData.pSurface = m_pSurface.get();

    return VclPtr<VirtualDevice>::Create(aSystemGraphicsData, get_surface_size(m_pSurface.get()),
                                         DeviceFormat::WITHOUT_ALPHA);
}

} // namespace cairo

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