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◆ main openmsx / src / video / FrameSource.cc
4.8 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
e8555c89 Andy McCall 1 
#include "FrameSource.hh"
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#include "LineScalers.hh"
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#include "aligned.hh"
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#include "inplace_buffer.hh"
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#include "ranges.hh"
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#include "unreachable.hh"
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#include <algorithm>
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#include <array>
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#include <span>
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namespace openmsx {
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using Pixel = FrameSource::Pixel;
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std::span<const Pixel, 320> FrameSource::getLinePtr320_240(unsigned line, std::span<Pixel, 320> buf0) const
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{
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	if (getHeight() == 240) {
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		auto r = getLine(line, std::span<Pixel>{buf0});
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		assert(r.size() == 320);
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		return std::span<const Pixel, 320>(r);
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	} else {
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		assert(getHeight() == 480);
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		ALIGNAS_SSE std::array<Pixel, 320> buf1;
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		auto line0 = getLine(2 * line + 0, std::span<Pixel>(buf0));
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		auto line1 = getLine(2 * line + 1, std::span<Pixel>(buf1));
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		blendLines(line0, line1, buf0); // possibly line0 == buf0
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		return buf0;
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	}
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}
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std::span<const Pixel, 640> FrameSource::getLinePtr640_480(unsigned line, std::span<Pixel, 640> buf) const
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{
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	if (getHeight() == 480) {
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		auto r = getLine(line, std::span<Pixel>(buf));
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		assert(r.size() == 640);
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		return std::span<const Pixel, 640>(r);
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	} else {
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		assert(getHeight() == 240);
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		auto r = getLine(line / 2, std::span<Pixel>(buf));
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		assert(r.size() == 640);
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		return std::span<const Pixel, 640>(r);
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	}
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}
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std::span<const Pixel, 960> FrameSource::getLinePtr960_720(unsigned line, std::span<Pixel, 960> buf0) const
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{
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	if (getHeight() == 480) {
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		unsigned l2 = (2 * line) / 3;
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		auto line0 = getLine(l2 + 0, std::span<Pixel>(buf0));
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		if ((line % 3) != 1) {
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			assert(line0.size() == 960);
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			return std::span<const Pixel, 960>(line0);
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		}
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		ALIGNAS_SSE std::array<Pixel, 960> buf1;
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		auto line1 = getLine(l2 + 1, std::span<Pixel>(buf1));
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		blendLines(line0, line1, buf0); // possibly line0 == buf0
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		return buf0;
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	} else {
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		assert(getHeight() == 240);
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		auto r = getLine(line / 3, std::span<Pixel>(buf0));
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		assert(r.size() == 960);
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		return std::span<const Pixel, 960>(r);
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	}
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}
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void FrameSource::scaleLine(
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	std::span<const Pixel> in, std::span<Pixel> out) const
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{
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	inplace_buffer<Pixel, 1280> tmpBuf(uninitialized_tag{}, in.size());
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	if (in.data() == out.data()) [[unlikely]] {
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		// Only happens in case getLineInfo() already used buf.
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		// E.g. when a line of a SuperImposedFrame also needs to be
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		// scaled.
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		// TODO If the LineScaler routines can work in-place then this
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		//      copy can be avoided.
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		copy_to_range(in, tmpBuf);
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		in = tmpBuf;
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	}
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	// TODO is there a better way to implement this?
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	switch (in.size()) {
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	case 1:  // blank
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		std::ranges::fill(out, in[0]);
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		break;
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	case 213:
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		switch (out.size()) {
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		case    1: out[0] = in[0]; break;
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		case  213: UNREACHABLE; break;
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		case  320: scale_2on3(in, out); break;
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		case  426: scale_1on2(in, out); break;
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		case  640: scale_1on3(in, out); break;
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		case  853: scale_1on4(in, out); break;
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		case  960: scale_2on9(in, out); break;
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		case 1280: scale_1on6(in, out); break;
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		default: UNREACHABLE;
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		}
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		break;
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	case 320:
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		switch (out.size()) {
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		case    1: out[0] = in[0]; break;
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		case  213: scale_3on2(in, out); break;
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		case  320: UNREACHABLE; break;
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		case  426: scale_3on4(in, out); break;
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		case  640: scale_1on2(in, out); break;
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		case  853: scale_3on8(in, out); break;
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		case  960: scale_1on3(in, out); break;
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		case 1280: scale_1on4(in, out); break;
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		default: UNREACHABLE;
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		}
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		break;
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	case 426:
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		switch (out.size()) {
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		case    1: out[0] = in[0]; break;
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		case  213: scale_2on1(in, out); break;
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		case  320: scale_4on3(in, out); break;
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		case  426: UNREACHABLE; break;
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		case  640: scale_2on3(in, out); break;
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		case  853: scale_1on2(in, out); break;
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		case  960: scale_4on9(in, out); break;
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		case 1280: scale_1on3(in, out); break;
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		default: UNREACHABLE;
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		}
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		break;
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	case 640:
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		switch (out.size()) {
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		case    1: out[0] = in[0]; break;
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		case  213: scale_3on1(in, out); break;
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		case  320: scale_2on1(in, out); break;
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		case  426: scale_3on2(in, out); break;
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		case  640: UNREACHABLE; break;
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		case  853: scale_3on4(in, out); break;
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		case  960: scale_2on3(in, out); break;
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		case 1280: scale_1on2(in, out); break;
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		default: UNREACHABLE;
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		}
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		break;
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	case 853:
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		switch (out.size()) {
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		case    1: out[0] = in[0]; break;
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		case  213: scale_4on1(in, out); break;
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		case  320: scale_8on3(in, out); break;
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		case  426: scale_2on1(in, out); break;
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		case  640: scale_4on3(in, out); break;
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		case  853: UNREACHABLE; break;
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		case  960: scale_8on9(in, out); break;
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		case 1280: scale_2on3(in, out); break;
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		default: UNREACHABLE;
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		}
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		break;
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	case 1280:
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		switch (out.size()) {
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		case    1: out[0] = in[0]; break;
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		case  213: scale_6on1(in, out); break;
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		case  320: scale_4on1(in, out); break;
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		case  426: scale_3on1(in, out); break;
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		case  640: scale_2on1(in, out); break;
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		case  853: scale_3on2(in, out); break;
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		case  960: scale_4on3(in, out); break;
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		case 1280: UNREACHABLE; break;
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		default: UNREACHABLE;
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		}
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		break;
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	default:
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		UNREACHABLE;
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	}
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}
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} // namespace openmsx