internal static Size AdjustImageSizeForNewBaseSize(bool allowEnlargement, IResizeDecoratorSettings s, Size newBaseSize, RotateFlipType rotation, ImageDecoratorContext context)
{
Size rotatedBaseSize = ImageUtils.IsRotated90(rotation)
? new Size(newBaseSize.Height, newBaseSize.Width)
: newBaseSize;
if (s.ImageSizeName != ImageSizeName.Custom)
{
// If a standard image size is being used, fit to that
Size sizeBounds = ImageSizeHelper.GetSizeConstraints(s.ImageSizeName);
if (!allowEnlargement)
{
sizeBounds.Width = Math.Min(rotatedBaseSize.Width, sizeBounds.Width);
sizeBounds.Height = Math.Min(rotatedBaseSize.Height, sizeBounds.Height);
}
return ImageUtils.GetScaledImageSize(sizeBounds.Width, sizeBounds.Height, rotatedBaseSize);
}
else
{
// If custom size, but we know the base size, preserve
// the aspect ratio "skew" (difference in x and y DPI)
// and pixel area
Size imageSize = s.ImageSize;
// Need to get the image size to the non-rotated angle,
// because s.BaseSize dimensions are always pre-rotation.
// Although ImageSize has not been fully updated for this
// decorator yet (that's what we're trying to do here),
// the width/height gets flipped immediately when a
// rotation is applied, so rotation is already taken
// into account.
if (ImageUtils.IsRotated90(rotation))
imageSize = new Size(imageSize.Height, imageSize.Width);
// If the base size has not been set yet, we have to guess.
// This basically means the image was inserted using an older
// build of Writer that did not have the crop feature. Ideally
// we would use the original image size, but this is expensive
// to get from here. It just so happens that newBaseSize works
// for now because the crop dialog defaults to the same aspect
// ratio as the original image, but if that ever changes this
// will break.
#if DEBUG
if (s.BaseSize == null)
{
using (Bitmap bitmap = (Bitmap)Bitmap.FromFile(context.SourceImageUri.LocalPath))
{
Size size = new Size(Math.Max(1, bitmap.Width / 2),
Math.Max(1, bitmap.Height / 2));
Debug.Assert(size.Equals(newBaseSize) || bitmap.Size.Equals(newBaseSize), "Check base size assumptions. Can't use 's.BaseSize ?? newBaseSize', instead must calculate original image size (context.SourceImageUri.LocalPath).");
}
}
#endif
Size baseSize = s.BaseSize ?? newBaseSize;
double xFactor = imageSize.Width / (double)baseSize.Width;
double yFactor = imageSize.Height / (double)baseSize.Height;
newBaseSize = new Size(
(int)Math.Round(xFactor * newBaseSize.Width),
(int)Math.Round(yFactor * newBaseSize.Height)
);
// Need to re-apply the rotation if necessary.
if (ImageUtils.IsRotated90(rotation))
newBaseSize = new Size(newBaseSize.Height, newBaseSize.Width);
// At this point, newBaseSize has the right aspect ratio; we now
// need to scale it so it uses about the same number of pixels
// as it did before.
double factor = (imageSize.Width * imageSize.Height) / (double)(newBaseSize.Width * newBaseSize.Height);
factor = Math.Sqrt(factor);
newBaseSize.Width = (int)Math.Round(newBaseSize.Width * factor);
newBaseSize.Height = (int)Math.Round(newBaseSize.Height * factor);
if (!allowEnlargement)
{
if (newBaseSize.Width > rotatedBaseSize.Width || newBaseSize.Height > rotatedBaseSize.Height)
newBaseSize = ImageUtils.GetScaledImageSize(rotatedBaseSize.Width, rotatedBaseSize.Height, newBaseSize);
}
return newBaseSize;
}
}
internal static Size AdjustImageSizeForNewBaseSize(bool allowEnlargement, IResizeDecoratorSettings s, Size newBaseSize, RotateFlipType rotation, ImageDecoratorContext context)
{
Size rotatedBaseSize = ImageUtils.IsRotated90(rotation)
? new Size(newBaseSize.Height, newBaseSize.Width)
: newBaseSize;
if (s.ImageSizeName != ImageSizeName.Custom)
{
// If a standard image size is being used, fit to that
Size sizeBounds = ImageSizeHelper.GetSizeConstraints(s.ImageSizeName);
if (!allowEnlargement)
{
sizeBounds.Width = Math.Min(rotatedBaseSize.Width, sizeBounds.Width);
sizeBounds.Height = Math.Min(rotatedBaseSize.Height, sizeBounds.Height);
}
return(ImageUtils.GetScaledImageSize(sizeBounds.Width, sizeBounds.Height, rotatedBaseSize));
}
else
{
// If custom size, but we know the base size, preserve
// the aspect ratio "skew" (difference in x and y DPI)
// and pixel area
Size imageSize = s.ImageSize;
// Need to get the image size to the non-rotated angle,
// because s.BaseSize dimensions are always pre-rotation.
// Although ImageSize has not been fully updated for this
// decorator yet (that's what we're trying to do here),
// the width/height gets flipped immediately when a
// rotation is applied, so rotation is already taken
// into account.
if (ImageUtils.IsRotated90(rotation))
{
imageSize = new Size(imageSize.Height, imageSize.Width);
}
// If the base size has not been set yet, we have to guess.
// This basically means the image was inserted using an older
// build of Writer that did not have the crop feature. Ideally
// we would use the original image size, but this is expensive
// to get from here. It just so happens that newBaseSize works
// for now because the crop dialog defaults to the same aspect
// ratio as the original image, but if that ever changes this
// will break.
#if DEBUG
if (s.BaseSize == null)
{
using (Bitmap bitmap = (Bitmap)Bitmap.FromFile(context.SourceImageUri.LocalPath))
{
Size size = new Size(Math.Max(1, bitmap.Width / 2),
Math.Max(1, bitmap.Height / 2));
Debug.Assert(size.Equals(newBaseSize) || bitmap.Size.Equals(newBaseSize), "Check base size assumptions. Can't use 's.BaseSize ?? newBaseSize', instead must calculate original image size (context.SourceImageUri.LocalPath).");
}
}
#endif
Size baseSize = s.BaseSize ?? newBaseSize;
double xFactor = imageSize.Width / (double)baseSize.Width;
double yFactor = imageSize.Height / (double)baseSize.Height;
newBaseSize = new Size(
(int)Math.Round(xFactor * newBaseSize.Width),
(int)Math.Round(yFactor * newBaseSize.Height)
);
// Need to re-apply the rotation if necessary.
if (ImageUtils.IsRotated90(rotation))
{
newBaseSize = new Size(newBaseSize.Height, newBaseSize.Width);
}
// At this point, newBaseSize has the right aspect ratio; we now
// need to scale it so it uses about the same number of pixels
// as it did before.
double factor = (imageSize.Width * imageSize.Height) / (double)(newBaseSize.Width * newBaseSize.Height);
factor = Math.Sqrt(factor);
newBaseSize.Width = (int)Math.Round(newBaseSize.Width * factor);
newBaseSize.Height = (int)Math.Round(newBaseSize.Height * factor);
if (!allowEnlargement)
{
if (newBaseSize.Width > rotatedBaseSize.Width || newBaseSize.Height > rotatedBaseSize.Height)
{
newBaseSize = ImageUtils.GetScaledImageSize(rotatedBaseSize.Width, rotatedBaseSize.Height, newBaseSize);
}
}
return(newBaseSize);
}
}
