AVMetadataCoverImageType MP4MediaFormat::GetCoverImageType()
{
if (GetCoverImage(nullptr) == 0)
return MetadataImageType_Unknown;
return MetadataImageType_JPG;
}
void CExtension::CreateIcon (int cxWidth, int cyHeight, CG32bitImage **retpIcon) const
// CreateIcon
//
// Creates a cover icon for the adventure. The caller is responsible for
// freeing the result.
{
// Load the image
CG32bitImage *pBackground = GetCoverImage();
if (pBackground == NULL || pBackground->GetWidth() == 0 || pBackground->GetHeight() == 0)
{
int cxSize = Min(cxWidth, cyHeight);
*retpIcon = new CG32bitImage;
(*retpIcon)->Create(cxSize, cxSize);
return;
}
// Figure out the dimensions of the icon based on the image size and the
// desired output.
//
// If the background is larger than the icon size then we need to scale it.
CG32bitImage *pIcon;
if (pBackground->GetWidth() > cxWidth || pBackground->GetHeight() > cyHeight)
{
int xSrc, ySrc, cxSrc, cySrc;
Metric rScale;
// If we have a widescreen cover image and we want a portrait or
// square icon, then we zoom in on the key part of the cover.
if (pBackground->GetWidth() > 2 * pBackground->GetHeight())
{
rScale = (Metric)cyHeight / pBackground->GetHeight();
cxSrc = (int)(cxWidth / rScale);
xSrc = Min(pBackground->GetWidth() - cxSrc, pBackground->GetWidth() - (RIGHT_COVER_OFFSET + (cxSrc / 2)));
ySrc = 0;
cySrc = pBackground->GetHeight();
}
else
{
rScale = (Metric)cxWidth / pBackground->GetWidth();
if (rScale * pBackground->GetHeight() > (Metric)cyHeight)
rScale = (Metric)cyHeight / pBackground->GetHeight();
xSrc = 0;
ySrc = 0;
cxSrc = pBackground->GetWidth();
cySrc = pBackground->GetHeight();
}
// Create the icon
pIcon = new CG32bitImage;
pIcon->CreateFromImageTransformed(*pBackground,
xSrc,
ySrc,
cxSrc,
cySrc,
rScale,
rScale,
0.0);
}
// Otherwise we center the image on the icon
else
{
// Create the icon
pIcon = new CG32bitImage;
pIcon->Create(cxWidth, cyHeight);
// Blt
pIcon->Blt(0,
0,
pBackground->GetWidth(),
pBackground->GetHeight(),
*pBackground,
(cxWidth - pBackground->GetWidth()) / 2,
(cyHeight - pBackground->GetHeight()) / 2);
}
// Done
*retpIcon = pIcon;
}
