public static GafImageInfo TrimImageInfo(GafImageInfo imageInfo, Rect rect)
{
var newData = new byte[rect.Width * rect.Height];
for (var y = 0; y < rect.Height; ++y)
{
for (var x = 0; x < rect.Width; ++x)
{
var sourceY = rect.Y + y;
var sourceX = rect.X + x;
newData[(y * rect.Width) + x] = imageInfo.Data[(sourceY * imageInfo.Width) + sourceX];
}
}
return(new GafImageInfo
{
Data = newData,
Width = rect.Width,
Height = rect.Height,
TransparencyIndex = imageInfo.TransparencyIndex
});
}
public static Rect ComputeMinBoundingRect(GafImageInfo imageInfo)
{
// FIXME: this will blow up if the image is entirely blank
var top = Enumerable.Range(0, imageInfo.Height)
.First(y => Enumerable.Range(0, imageInfo.Width)
.Any(x => imageInfo.Data[(y * imageInfo.Width) + x] != imageInfo.TransparencyIndex));
var left = Enumerable.Range(0, imageInfo.Width)
.First(x => Enumerable.Range(0, imageInfo.Height)
.Any(y => imageInfo.Data[(y * imageInfo.Width) + x] != imageInfo.TransparencyIndex));
var bottom = BackwardsRange(0, imageInfo.Height)
.First(y => Enumerable.Range(0, imageInfo.Width)
.Any(x => imageInfo.Data[(y * imageInfo.Width) + x] != imageInfo.TransparencyIndex));
var right = BackwardsRange(0, imageInfo.Width)
.First(x => Enumerable.Range(0, imageInfo.Height)
.Any(y => imageInfo.Data[(y * imageInfo.Width) + x] != imageInfo.TransparencyIndex));
return(new Rect(left, top, right - left + 1, bottom - top + 1));
}