DoubledFrame.cc

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#include "DoubledFrame.hh"

namespace openmsx {

DoubledFrame::DoubledFrame(const SDL_PixelFormat& format)
        : FrameSource(format)
{
}

void DoubledFrame::init(FrameSource* field_, unsigned skip_)
{
        FrameSource::init(FIELD_NONINTERLACED);
        field = field_;
        skip = skip_;
        setHeight(2 * field->getHeight());
}

unsigned DoubledFrame::getLineWidth(unsigned line) const
{
        int t = line - skip;
        return (t >= 0) ? field->getLineWidth(t / 2) : 1;
}

const void* DoubledFrame::getLineInfo(unsigned line, unsigned& width) const
{
        static const unsigned blackPixel = 0; // both 16bppp and 32bpp
        int t = line - skip;
        if (t >= 0) {
                return field->getLineInfo(t / 2, width);
        } else {
                width = 1;
                return &blackPixel;
        }
}

} // namespace openmsx