// This makes a preview for the given image and updates the image settings
private void MakeImagePreview(ImageData img)
{
lock (img)
{
// Load image if needed
if (!img.IsImageLoaded)
{
img.LoadImage();
}
int imagewidth, imageheight;
Bitmap image = img.GetBitmap(); //mxd
Bitmap preview;
lock (image)
{
if (!img.LoadFailed)
{
imagewidth = img.Width;
imageheight = img.Height;
}
else
{
Size size = image.Size; //mxd
imagewidth = size.Width;
imageheight = size.Height;
}
// Determine preview size
float scalex = (img.Width > MAX_PREVIEW_SIZE) ? (MAX_PREVIEW_SIZE / (float)imagewidth) : 1.0f;
float scaley = (img.Height > MAX_PREVIEW_SIZE) ? (MAX_PREVIEW_SIZE / (float)imageheight) : 1.0f;
float scale = Math.Min(scalex, scaley);
int previewwidth = (int)(imagewidth * scale);
int previewheight = (int)(imageheight * scale);
if (previewwidth < 1)
{
previewwidth = 1;
}
if (previewheight < 1)
{
previewheight = 1;
}
//mxd. Expected and actual image sizes and format match?
if (previewwidth == imagewidth && previewheight == imageheight && image.PixelFormat == IMAGE_FORMAT)
{
preview = new Bitmap(image);
}
else
{
// Make new image
preview = new Bitmap(previewwidth, previewheight, IMAGE_FORMAT);
Graphics g = Graphics.FromImage(preview);
g.PageUnit = GraphicsUnit.Pixel;
//g.CompositingQuality = CompositingQuality.HighQuality; //mxd
g.InterpolationMode = InterpolationMode.NearestNeighbor;
//g.SmoothingMode = SmoothingMode.HighQuality; //mxd
g.PixelOffsetMode = PixelOffsetMode.None;
//g.Clear(Color.Transparent); //mxd
// Draw image onto atlas
Rectangle atlasrect = new Rectangle(0, 0, previewwidth, previewheight);
RectangleF imgrect = General.MakeZoomedRect(new Size(imagewidth, imageheight), atlasrect);
if (imgrect.Width < 1.0f)
{
imgrect.X -= 0.5f - imgrect.Width * 0.5f;
imgrect.Width = 1.0f;
}
if (imgrect.Height < 1.0f)
{
imgrect.Y -= 0.5f - imgrect.Height * 0.5f;
imgrect.Height = 1.0f;
}
g.DrawImage(image, imgrect);
g.Dispose();
}
}
// Unload image if no longer needed
if (!img.IsReferenced)
{
img.UnloadImage();
}
lock (images)
{
// Set numbers
img.PreviewIndex = images.Count;
img.PreviewState = ImageLoadState.Ready;
// Add to previews list
images.Add(preview);
}
}
}
// This makes a preview for the given image and updates the image settings
private void MakeImagePreview(ImageData img)
{
int previewwidth, previewheight;
int imagewidth, imageheight;
Bitmap preview;
Graphics g;
lock (img)
{
// Load image if needed
if (!img.IsImageLoaded)
{
img.LoadImage();
}
if (!img.LoadFailed)
{
imagewidth = img.Width;
imageheight = img.Height;
}
else
{
imagewidth = img.GetBitmap().Size.Width;
imageheight = img.GetBitmap().Size.Height;
}
// Determine preview size
float scalex = (img.Width > maxpreviewwidth) ? ((float)maxpreviewwidth / (float)imagewidth) : 1.0f;
float scaley = (img.Height > maxpreviewheight) ? ((float)maxpreviewheight / (float)imageheight) : 1.0f;
float scale = Math.Min(scalex, scaley);
previewwidth = (int)((float)imagewidth * scale);
previewheight = (int)((float)imageheight * scale);
if (previewwidth < 1)
{
previewwidth = 1;
}
if (previewheight < 1)
{
previewheight = 1;
}
// Make new image
preview = new Bitmap(previewwidth, previewheight, IMAGE_FORMAT);
g = Graphics.FromImage(preview);
g.PageUnit = GraphicsUnit.Pixel;
g.CompositingQuality = CompositingQuality.HighQuality;
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.SmoothingMode = SmoothingMode.HighQuality;
g.PixelOffsetMode = PixelOffsetMode.None;
g.Clear(Color.Transparent);
// Draw image onto atlas
Rectangle atlasrect = new Rectangle(0, 0, previewwidth, previewheight);
RectangleF imgrect = General.MakeZoomedRect(new Size(imagewidth, imageheight), atlasrect);
if (imgrect.Width < 1.0f)
{
imgrect.X -= 0.5f - imgrect.Width * 0.5f;
imgrect.Width = 1.0f;
}
if (imgrect.Height < 1.0f)
{
imgrect.Y -= 0.5f - imgrect.Height * 0.5f;
imgrect.Height = 1.0f;
}
g.DrawImage(img.GetBitmap(), imgrect);
g.Dispose();
// Unload image if no longer needed
if (!img.IsReferenced)
{
img.UnloadImage();
}
lock (images)
{
// Set numbers
img.PreviewIndex = images.Count;
img.PreviewState = ImageLoadState.Ready;
// Add to previews list
images.Add(preview);
}
}
}
