#include "RawFrame.hh"

namespace openmsx {

[[nodiscard]] static unsigned calcMaxWidth(unsigned maxWidth)

{

	unsigned bytes = maxWidth * sizeof(RawFrame::Pixel);

	bytes = (bytes + 63) & ~63; // round up to cache-line size

	return bytes / sizeof(RawFrame::Pixel);

}

RawFrame::RawFrame(unsigned maxWidth_, unsigned height_)

	: lineWidths(height_)

	, maxWidth(calcMaxWidth(maxWidth_))

{

	setHeight(height_);

	// Allocate memory, make sure each line starts at a 64 byte boundary:

	// - SSE instructions need 16 byte aligned data

	// - cache line size on many CPUs is 64 bytes

	data.resize(size_t(maxWidth) * height_);

	// Start with a black frame.

	init(FieldType::NONINTERLACED);

	for (auto line : xrange(height_)) {

		setBlank(line, Pixel(0));

	}

}

unsigned RawFrame::getLineWidth(unsigned line) const

{

	assert(line < getHeight());

	return lineWidths[line];

}

std::span<const RawFrame::Pixel> RawFrame::getUnscaledLine(

	unsigned line, std::span<Pixel> /*helpBuf*/) const

{

	return getLineDirect(line).first(lineWidths[line]);

}

bool RawFrame::hasContiguousStorage() const

{

	return true;

}

} // namespace openmsx