RawFrame.cc

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#include "RawFrame.hh"
#include <cstdint>
#include <SDL.h>

namespace openmsx {

RawFrame::RawFrame(
                const SDL_PixelFormat& format, unsigned maxWidth_, unsigned height_)
        : FrameSource(format)
        , lineWidths(height_)
        , maxWidth(maxWidth_)
{
        setHeight(height_);
        unsigned bytesPerPixel = format.BytesPerPixel;

        // 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
        pitch = ((bytesPerPixel * maxWidth) + 63) & ~63;
        data.resize(pitch * height_);

        maxWidth = pitch / bytesPerPixel; // adjust maxWidth

        // Start with a black frame.
        init(FIELD_NONINTERLACED);
        for (unsigned line = 0; line < height_; line++) {
                if (bytesPerPixel == 2) {
                        setBlank(line, static_cast<uint16_t>(0));
                } else {
                        setBlank(line, static_cast<uint32_t>(0));
                }
        }
}

unsigned RawFrame::getLineWidth(unsigned line) const
{
        assert(line < getHeight());
        return lineWidths[line];
}

const void* RawFrame::getLineInfo(
        unsigned line, unsigned& width,
        void* /*buf*/, unsigned /*bufWidth*/) const
{
        assert(line < getHeight());
        width = lineWidths[line];
        return data.data() + line * pitch;
}

unsigned RawFrame::getRowLength() const
{
        return maxWidth; // in pixels (not in bytes)
}

bool RawFrame::hasContiguousStorage() const
{
        return true;
}

} // namespace openmsx