function img_adaption(img) {
if (!$(img).hasClass('img_adapted')) {
$(img).css({'display': 'none'});
var originalWidth = $(img).width();
var originalHeight = $(img).height();
var parentWidth = $(img).parent().width();
var parentHeight = $(img).parent().height();
var originalScale = originalWidth / originalHeight;
var parentScal = parentWidth / parentHeight;
var scaleNum, newImgWidth;
var newImgHeight = 0;
var changeNum = 0;
if ($(img).parent().css('position') == 'static') {
$(img).parent().css({
'position': 'relative',
'overflow': 'hidden'
})
}
if (originalScale > parentScal) {
scaleNum = originalHeight / parentHeight;
newImgWidth = originalWidth / scaleNum;
changeNum = (newImgWidth - parentWidth) / 2;
$(img).css({
'width': 'auto',
'height': parentHeight,
'margin-left': -changeNum,
'display': 'block',
'border-radius': '0'
});
$(img).fadeIn();
} else if (originalScale < parentScal) {
scaleNum = originalWidth / parentWidth;
newImgHeight = originalHeight / scaleNum;
changeNum = (newImgHeight - parentHeight) / 2;
$(img).css({
'width': parentWidth,
'height': 'auto',
'margin-top': -changeNum,
'display': 'block',
'border-radius': '0'
});
$(img).fadeIn();
} else {
$(img).css({
'width': '100%',
'height': '100%',
'display': 'block'
});
$(img).fadeIn();
}
$(img).addClass('img_adapted');
} else {
$(img).css({'display': 'block'})
}
}
