private IEnumerable <int> GetIntFromPixel(UIImage bmp)
{
for (var x = 0; x < bmp.Size.Width; x++)
{
for (var y = 0; y < bmp.Size.Height; y++)
{
var rawData = new byte[4];
var handle = GCHandle.Alloc(rawData);
try
{
using (var colorSpace = CGColorSpace.CreateDeviceRGB())
{
using (var context = new CGBitmapContext(rawData, 1, 1, 8, 4, colorSpace, CGImageAlphaInfo.PremultipliedLast))
{
context.DrawImage(new RectangleF(-x, y - Convert.ToInt32(bmp.Size.Height), Convert.ToInt32(bmp.Size.Width),
Convert.ToInt32(bmp.Size.Height)), bmp.CGImage);
//float red = (rawData[0]) / 255.0f;
//float green = (rawData[1]) / 255.0f;
//float blue = (rawData[2]) / 255.0f;
//float alpha = (rawData[3]) / 255.0f;
yield return((int)rawData[2]); //B;
yield return((int)rawData[1]); //G;
yield return((int)rawData[0]); //R;
yield return((int)rawData[3]); //A;
}
}
}
finally
{
handle.Free();
}
}
}
}
public void Dispose()
{
if (Address == IntPtr.Zero)
{
return;
}
var nfo = (int)CGBitmapFlags.ByteOrder32Big | (int)CGImageAlphaInfo.PremultipliedLast;
using (var colorSpace = CGColorSpace.CreateDeviceRGB())
using (var bContext = new CGBitmapContext(Address, Width, Height, 8, Width * 4,
colorSpace, (CGImageAlphaInfo)nfo))
using (var image = bContext.ToImage())
using (var context = UIGraphics.GetCurrentContext())
{
// flip the image for CGContext.DrawImage
context.TranslateCTM(0, _viewHeight);
context.ScaleCTM(1, -1);
context.DrawImage(new CGRect(0, 0, _viewWidth, _viewHeight), image);
}
Marshal.FreeHGlobal(Address);
Address = IntPtr.Zero;
}
public void Dispose()
{
if (Address == IntPtr.Zero)
{
return;
}
var nfo = (int)CGBitmapFlags.ByteOrder32Big | (int)CGImageAlphaInfo.PremultipliedLast;
using (var colorSpace = CGColorSpace.CreateDeviceRGB())
using (var bContext = new CGBitmapContext(Address, Width, Height, 8, Width * 4,
colorSpace, (CGImageAlphaInfo)nfo))
using (var image = bContext.ToImage())
using (var nscontext = NSGraphicsContext.CurrentContext)
using (var context = nscontext.GraphicsPort)
{
context.SetFillColor(255, 255, 255, 255);
context.FillRect(new CGRect(default(CGPoint), _logicalSize));
context.DrawImage(new CGRect(default(CGPoint), _logicalSize), image);
}
Marshal.FreeHGlobal(Address);
Address = IntPtr.Zero;
}
public void CreateIndexed()
{
// from: http://developer.apple.com/library/ios/#documentation/GraphicsImaging/Reference/CGColorSpace/Reference/reference.html
// m is the number of color components in the base color space
nint m = 3; // RGB
const int lastIndex = 2;
// An array of m*(lastIndex+1) bytes
byte[] table = new byte [3 * (lastIndex + 1)] {
1, 2, 3, 4, 5, 6, 255, 255, 255
};
using (var base_cs = CGColorSpace.CreateDeviceRGB())
using (var cs = CGColorSpace.CreateIndexed(base_cs, lastIndex, table)) {
Assert.That(cs.Components, Is.EqualTo((nint)1), "1");
Assert.That(cs.Model, Is.EqualTo(CGColorSpaceModel.Indexed), "Indexed");
var bcs = cs.GetBaseColorSpace();
Assert.That(bcs.Components, Is.EqualTo(m), "Components");
Assert.That(base_cs.Model, Is.EqualTo(bcs.Model), "GetBaseColorSpace");
var new_table = cs.GetColorTable();
Assert.That(table, Is.EqualTo(new_table), "GetColorTable");
#if NET
Assert.Null(cs.GetIccProfile(), "GetIccProfile");
#else
Assert.Null(cs.GetICCProfile(), "GetICCProfile");
#endif
if (TestRuntime.CheckXcodeVersion(8, 0))
{
Assert.Null(cs.Name, "Name");
Assert.False(cs.IsWideGamutRgb, "IsWideGamutRgb");
Assert.False(cs.SupportsOutput, "SupportsOutput");
Assert.Null(cs.GetIccData(), "GetIccData");
}
if (TestRuntime.CheckXcodeVersion(12, 0))
{
Assert.False(cs.UsesExtendedRange, "UsesExtendedRange");
}
}
}
protected override void UpdateDetailDisplay(UITableViewCell cell)
{
if (cell == null || Parent == null)
{
return;
}
var psection = Parent as Section;
bool roundTop = psection?.Elements[0] == this;
bool roundBottom = psection?.Elements[psection.Elements.Count - 1] == this;
using (var cs = CGColorSpace.CreateDeviceRGB())
{
using (
var bit = new CGBitmapContext(IntPtr.Zero, Dimx, Dimy, 8, 0, cs, CGImageAlphaInfo.PremultipliedFirst)
)
{
DrawClippedBitmap(roundTop, bit, roundBottom);
cell.ImageView.Image = UIImage.FromImage(bit.ToImage());
}
}
}
public PatternDrawingView() : base()
{
// First we need to create a CGPattern that specifies the qualities of our pattern.
using (var coloredPattern = new CGPattern(
new RectangleF(0, 0, 16, 16), // the pattern coordinate space, drawing is clipped to this rectangle
CGAffineTransform.MakeIdentity(), // a transform on the pattern coordinate space used before it is drawn.
16, 16, // the spacing (horizontal, vertical) of the pattern - how far to move after drawing each cell
CGPatternTiling.NoDistortion,
true, // this is a colored pattern, which means that you only specify an alpha value when drawing it
DrawColored)){
// To draw a pattern, you need a pattern colorspace.
// Since this is an colored pattern, the parent colorspace is NULL, indicating that it only has an alpha value.
using (var coloredPatternColorSpace = CGColorSpace.CreatePattern(null)){
float alpha = 1;
// Since this pattern is colored, we'll create a CGColor for it to make drawing it easier and more efficient.
// From here on, the colored pattern is referenced entirely via the associated CGColor rather than the
// originally created CGPatternRef.
coloredPatternColor = new CGColor(coloredPatternColorSpace, coloredPattern, new float [] { alpha });
}
}
// Uncolored Pattern setup
// As above, we create a CGPattern that specifies the qualities of our pattern
uncoloredPattern = new CGPattern(
new RectangleF(0, 0, 16, 16), // coordinate space
CGAffineTransform.MakeIdentity(), // transform
16, 16, // spacing
CGPatternTiling.NoDistortion,
false, // this is an uncolored pattern, thus to draw it we need to specify both color and alpha
DrawUncolored); // callbacks for this pattern
// With an uncolored pattern we still need to create a pattern colorspace, but now we need a parent colorspace
// We'll use the DeviceRGB colorspace here. We'll need this colorspace along with the CGPatternRef to draw this pattern later.
using (var deviceRGB = CGColorSpace.CreateDeviceRGB()){
uncoloredPatternColorSpace = CGColorSpace.CreatePattern(deviceRGB);
}
}
public byte[] ResizeImage(byte[] imageData, float width, float height)
{
UIImage originalImage = ImageFromByteArray(imageData);
UIImageOrientation orientation = originalImage.Orientation;
//create a 24bit RGB image
using (CGBitmapContext context = new CGBitmapContext(IntPtr.Zero,
(int)width, (int)height, 8,
4 * (int)width, CGColorSpace.CreateDeviceRGB(),
CGImageAlphaInfo.PremultipliedFirst))
{
RectangleF imageRect = new RectangleF(0, 0, width, height);
// draw the image
context.DrawImage(imageRect, originalImage.CGImage);
UIKit.UIImage resizedImage = UIKit.UIImage.FromImage(context.ToImage(), 0, orientation);
// save the image as a jpeg
return(resizedImage.AsPNG().ToArray());
}
}
public override void ViewDidLoad()
{
base.ViewDidLoad();
// set the background color of the view to white
View.BackgroundColor = UIColor.White;
// instantiate a new image view that takes up the whole screen and add it to
// the view hierarchy
RectangleF imageViewFrame = new RectangleF(0, -NavigationController.NavigationBar.Frame.Height, View.Frame.Width, View.Frame.Height);
imageView = new UIImageView(imageViewFrame);
View.AddSubview(imageView);
// create our offscreen bitmap context
// size
SizeF bitmapSize = new SizeF(View.Frame.Size);
using (CGBitmapContext context = new CGBitmapContext(IntPtr.Zero, (int)bitmapSize.Width, (int)bitmapSize.Height, 8, (int)(4 * bitmapSize.Width), CGColorSpace.CreateDeviceRGB(), CGImageAlphaInfo.PremultipliedFirst)) {
// declare vars
RectangleF patternRect = new RectangleF(0, 0, 16, 16);
// set the color space of our fill to be the patter colorspace
context.SetFillColorSpace(CGColorSpace.CreatePattern(CGColorSpace.CreateDeviceRGB()));
// create a new pattern
CGPattern pattern = new CGPattern(patternRect, CGAffineTransform.MakeRotation(.3f)
, 16, 16, CGPatternTiling.NoDistortion, false, DrawPolkaDotPattern);
// set our fill as our pattern, color doesn't matter because the pattern handles it
context.SetFillPattern(pattern, new float[] { 1, 0, 0, 1 });
// fill the entire view with that pattern
context.FillRect(imageView.Frame);
// output the drawing to the view
imageView.Image = UIImage.FromImage(context.ToImage());
}
}
private static UIImage GetThumbImage(float thumbContentSize, int pageNumber)
{
if ((pageNumber <= 0) || (pageNumber > PDFDocument.PageCount))
{
return(null);
}
var pageSize = PageContentView.GetPageViewSize(pageNumber);
if (pageSize.Width % 2 > 0)
{
pageSize.Width--;
}
if (pageSize.Height % 2 > 0)
{
pageSize.Height--;
}
var targetSize = new CGSize((int)pageSize.Width, (int)pageSize.Height);
CGImage pageImage;
using (CGColorSpace rgb = CGColorSpace.CreateDeviceRGB()) {
using (var context = new CGBitmapContext(null, (int)targetSize.Width, (int)targetSize.Height, 8, 0, rgb, CGBitmapFlags.ByteOrder32Little | CGBitmapFlags.NoneSkipFirst)) {
using (var pdfPage = PDFDocument.GetPage(pageNumber)) {
var thumbRect = new CGRect(0.0f, 0.0f, targetSize.Width, targetSize.Height);
context.SetFillColor(1.0f, 1.0f, 1.0f, 1.0f);
context.FillRect(thumbRect);
context.ConcatCTM(pdfPage.GetDrawingTransform(CGPDFBox.Crop, thumbRect, 0, true));
context.SetRenderingIntent(CGColorRenderingIntent.Default);
context.InterpolationQuality = CGInterpolationQuality.Default;
context.DrawPDFPage(pdfPage);
pageImage = context.ToImage();
}
}
}
return(UIImage.FromImage(pageImage));
}
private void ConvertFromCGImage(CGImage cgImage)
{
//Don't do this, Xamarin.iOS won't be able to resolve: if (this is Image<Rgba, Byte>)
if (typeof(TColor) == typeof(Rgba) && typeof(TDepth) == typeof(byte))
{
RectangleF rect = new RectangleF(PointF.Empty, new SizeF(cgImage.Width, cgImage.Height));
using (CGColorSpace cspace = CGColorSpace.CreateDeviceRGB())
using (CGBitmapContext context = new CGBitmapContext(
MIplImage.ImageData,
Width, Height,
8,
Width * 4,
cspace,
CGImageAlphaInfo.PremultipliedLast))
context.DrawImage(rect, cgImage);
}
else
{
using (Image <Rgba, Byte> tmp = new Image <Rgba, Byte>(cgImage))
ConvertFrom(tmp);
}
}
UIImage ImageFromSampleBuffer(CMSampleBuffer sampleBuffer)
{
// Get the CoreVideo image
using (var pixelBuffer = sampleBuffer.GetImageBuffer() as CVPixelBuffer){
// Lock the base address
pixelBuffer.Lock(0);
// Get the number of bytes per row for the pixel buffer
var baseAddress = pixelBuffer.BaseAddress;
int bytesPerRow = pixelBuffer.BytesPerRow;
int width = pixelBuffer.Width;
int height = pixelBuffer.Height;
var flags = CGBitmapFlags.PremultipliedFirst | CGBitmapFlags.ByteOrder32Little;
// Create a CGImage on the RGB colorspace from the configured parameter above
using (var cs = CGColorSpace.CreateDeviceRGB())
using (var context = new CGBitmapContext(baseAddress, width, height, 8, bytesPerRow, cs, (CGImageAlphaInfo)flags))
using (var cgImage = context.ToImage()){
pixelBuffer.Unlock(0);
return(UIImage.FromImage(cgImage));
}
}
}
/// <summary>
/// for debugging...
/// </summary>
public UIImage ImageBufferToUIImage(CVPixelBuffer imageBuffer)
{
//imageBuffer
imageBuffer.Lock(CVPixelBufferLock.None);
var baseAddress = imageBuffer.BaseAddress;
var bytesPerRow = imageBuffer.BytesPerRow;
var width = imageBuffer.Width;
var height = imageBuffer.Height;
var colorSpace = CGColorSpace.CreateDeviceRGB();
var bitmapInfo = (uint)CGImageAlphaInfo.NoneSkipFirst | (uint)CGBitmapFlags.ByteOrder32Little;
var context = new CGBitmapContext(baseAddress, width, height, 8, bytesPerRow, colorSpace, (CGImageAlphaInfo)bitmapInfo);
var quartzImage = context?.ToImage();
imageBuffer.Unlock(CVPixelBufferLock.None);
var image = new UIImage(quartzImage, 1.0f, UIImageOrientation.Right);
// HACK: save as file
//var documentsDirectory = Environment.GetFolderPath
// (Environment.SpecialFolder.Personal);
//string jpgFilename = System.IO.Path.Combine(documentsDirectory, "Photo.jpg"); // hardcoded filename, overwritten each time
//NSData imgData = image.AsJPEG();
//NSError err = null;
//if (imgData.Save(jpgFilename, false, out err))
//{
// Console.WriteLine("saved as " + jpgFilename);
//}
//else
//{
// Console.WriteLine("NOT saved as " + jpgFilename + " because" + err.LocalizedDescription);
//}
return(image);
}
public static UIImage HeatMapWithRect(CGRect rect, double boost, PointF[] points, double[] weights, bool weightsAdjustmentEnabled, bool groupingEnabled)
{
var rect1 = new Rect {
Width = rect.Width, Height = rect.Height, X = rect.X, Y = rect.Y
};
var points1 = new List <PointWithWeight>();
for (int i = 0; i < points.Length; i++)
{
points1.Add(new PointWithWeight(points[i].X, points[i].Y, weights[i]));
}
var bytes = LFHeatMap.HeatMap.HeatMapForRectangle(rect1, boost, points1.ToArray(), weightsAdjustmentEnabled, groupingEnabled);
CGImage cgImage = null;
using (var colorSpace = CGColorSpace.CreateDeviceRGB())
using (var context = new CGBitmapContext(bytes, (nint)rect.Width, (nint)rect.Height, 8, 4 * (nint)rect.Width, colorSpace, CGBitmapFlags.PremultipliedLast | CGBitmapFlags.ByteOrderDefault))
cgImage = context.ToImage();
return(new UIImage(cgImage));
}
public static XIR.Image RemoteRepresentation(this CGPath cgPath)
{
// We add just a little padding to keep from clipping the drawings that lie on the bounds.
var width = (int)cgPath.PathBoundingBox.Width + 4 > 0 ? (int)cgPath.PathBoundingBox.Width + 4 : 200;
var height = (int)cgPath.PathBoundingBox.Height + 4 > 0 ? (int)cgPath.PathBoundingBox.Height + 4 : 200;
var bytesPerRow = width * 4;
// We need to offset the image to keep from clipping the drawing.
var offsetXZero = -cgPath.PathBoundingBox.X;
var offsetYZero = -cgPath.PathBoundingBox.Y;
// Create a transform to offset our drawing.
var transform = CGAffineTransform.MakeIdentity();
transform.Translate(offsetXZero + 1, offsetYZero + 1);
using (var context = new CGBitmapContext(
IntPtr.Zero, width, height,
8, bytesPerRow, CGColorSpace.CreateDeviceRGB(),
CGImageAlphaInfo.PremultipliedFirst))
{
// Make sure we offset our drawing to keep it form clipping
context.ConcatCTM(transform);
context.SaveState();
context.SetFillColor(brush.CGColor);
context.AddPath(cgPath);
context.FillPath();
context.RestoreState();
context.SetStrokeColor(pen.CGColor);
context.SetLineWidth(1f);
context.AddPath(cgPath);
context.DrawPath(CGPathDrawingMode.Stroke);
return(context.RemoteRepresentation());
}
}
/// <summary>
/// Gets the rgba bytes from an image stream.
/// </summary>
/// <param name="imageStream">The source image stream.</param>
/// <returns>An array containing the premultiplied RGBA bytes of the raw image</returns>
public static byte[] GetRGBABytes(Stream imageStream)
{
byte[] outputData = null;
using (var uiImage = UIImage.LoadFromData(NSData.FromStream(imageStream)))
{
var cgImage = uiImage.CGImage;
var imageWidth = (int)cgImage.Width;
var imageHeight = (int)cgImage.Height;
outputData = new byte[imageWidth * imageHeight * 4];
using (var colorSpace = CGColorSpace.CreateDeviceRGB())
using (var bitmapContext = new CGBitmapContext(outputData, imageWidth, imageHeight, 8, imageWidth * 4, colorSpace, CGBitmapFlags.PremultipliedLast))
{
bitmapContext.DrawImage(new RectangleF(0, 0, imageWidth, imageHeight), cgImage);
}
}
return(outputData);
}
/// <summary>
/// Returns one dimensional byte array with pixel color info (0 - 255).
/// Each 4 consecutive pixels represent r, g, b, a values of one pixel.
/// Use <see cref="GetPixelColor"/> method to get a tuple with each component
/// for a specific pixel.
/// </summary>
private static byte[] GetRawPixelData(UIImage image, int width, int height)
{
var rawData = new byte[width * height * 4];
var handle = GCHandle.Alloc(rawData);
try
{
using (var colorSpace = CGColorSpace.CreateDeviceRGB())
{
using (var context = new CGBitmapContext(rawData, width, height, 8, width * 4, colorSpace, CGImageAlphaInfo.PremultipliedLast))
{
context.DrawImage(new CGRect(0, 0, image.Size.Width, image.Size.Height), image.CGImage);
return(rawData);
}
}
}
finally
{
handle.Free();
}
}
public static CGBitmapContext ToBitmapContext(this System.Drawing.SizeF size)
{
using (var colorSpace = CGColorSpace.CreateDeviceRGB())
{
var pixelsWide = (int)size.Width;
var pixelsHigh = (int)size.Height;
var bitmapBytesPerRow = (pixelsWide * 4);// 1
var bitmapByteCount = (bitmapBytesPerRow * pixelsHigh);
var bitmapData = new byte[bitmapByteCount];
return(new CGBitmapContext(
bitmapData,
pixelsWide,
pixelsHigh,
8, // bits per component
bitmapBytesPerRow,
colorSpace,
CGImageAlphaInfo.PremultipliedLast));
}
}
public byte[] ResizeImage(byte[] imageData, float width, float height, int quality)
{
UIImage originalImage = ImageFromByteArray(imageData);
float oldWidth = (float)originalImage.Size.Width;
float oldHeight = (float)originalImage.Size.Height;
float scaleFactor = 0f;
if (oldWidth > oldHeight)
{
scaleFactor = width / oldWidth;
}
else
{
scaleFactor = height / oldHeight;
}
float newHeight = oldHeight * scaleFactor;
float newWidth = oldWidth * scaleFactor;
//create a 24bit RGB image
using (CGBitmapContext context = new CGBitmapContext(IntPtr.Zero,
(int)newWidth, (int)newHeight, 8,
0, CGColorSpace.CreateDeviceRGB(),
CGImageAlphaInfo.PremultipliedFirst))
{
RectangleF imageRect = new RectangleF(0, 0, newWidth, newHeight);
// draw the image
context.DrawImage(imageRect, originalImage.CGImage);
UIImage resizedImage = UIImage.FromImage(context.ToImage());
// save the image as a jpeg
return(resizedImage.AsJPEG((float)quality).ToArray());
}
}
public Tuple <System.Drawing.Size, byte[]> ReduceImage(byte[] datas, int maxWidth)
{
UIImage originalImage = ImageFromByteArray(datas);
//原图比较小，不用缩小
if (originalImage.Size.Width <= maxWidth)
{
return(new Tuple <System.Drawing.Size, byte[]>(
new System.Drawing.Size()
{
Width = (int)originalImage.Size.Width,
Height = (int)originalImage.Size.Height
}, datas));
}
else //按比例缩小
{
int width = maxWidth;
int height = (int)(width * originalImage.Size.Height / originalImage.Size.Width);
using (CGBitmapContext context = new CGBitmapContext(IntPtr.Zero,
width, height, 8,
(4 * width), CGColorSpace.CreateDeviceRGB(),
CGImageAlphaInfo.PremultipliedFirst))
{
RectangleF imageRect = new RectangleF(0, 0, width, height);
// draw the image
context.DrawImage(imageRect, originalImage.CGImage);
UIKit.UIImage resizedImage = UIKit.UIImage.FromImage(context.ToImage(), 0, originalImage.Orientation);
// save the image as a jpeg
return(new Tuple <System.Drawing.Size, byte[]>(
new System.Drawing.Size(width, height),
resizedImage.AsJPEG().ToArray()));
}
}
}
public void DrawContentView(RectangleF rect, CGContext context, UITableViewElementCell cell)
{
var gradientFrame = rect;
var shineFrame = gradientFrame;
shineFrame.Y += 1;
shineFrame.X += 1;
shineFrame.Width -= 2;
shineFrame.Height = (shineFrame.Height / 2);
CGColorSpace colorSpace = CGColorSpace.CreateDeviceRGB();
var gradient = new CGGradient(
colorSpace,
new float[] { 0f, 0f, 0f, 0.70f,
0f, 0f, 0f, 0.40f },
new float[] { 0, 1 });
var shineGradient = new CGGradient(
colorSpace,
new float[] { 1f, 1f, 1f, 0.80f,
1f, 1f, 1f, 0.10f },
new float[] { 0, 1 });
if (Cell != null && Cell.Highlighted)
{
context.SetFillColorWithColor(HighlightColor.CGColor);
}
else
{
context.SetFillColorWithColor(CellBackgroundColor.CGColor);
}
context.FillRect(rect);
context.DrawLinearGradient(gradient, new PointF(gradientFrame.Left, gradientFrame.Top), new PointF(gradientFrame.Left, gradientFrame.Bottom), CGGradientDrawingOptions.DrawsAfterEndLocation);
context.DrawLinearGradient(shineGradient, new PointF(shineFrame.Left, shineFrame.Top), new PointF(shineFrame.Left, shineFrame.Bottom), CGGradientDrawingOptions.DrawsAfterEndLocation);
}
static UIImage ProcessImageNamed(string imageName)
{
var image = UIImage.FromBundle(imageName);
if (image == null)
{
return(null);
}
if (imageName.Contains(".jpg"))
{
return(image);
}
UIImage resultingImage;
using (var colorSpace = CGColorSpace.CreateDeviceRGB()) {
// Create a bitmap context of the same size as the image.
var imageWidth = (int)image.Size.Width;
var imageHeight = (int)image.Size.Height;
using (var bitmapContext = new CGBitmapContext(null, imageWidth, imageHeight, 8, imageHeight * 4,
colorSpace, CGBitmapFlags.PremultipliedLast | CGBitmapFlags.ByteOrder32Little)) {
// Draw the image into the graphics context.
if (image.CGImage == null)
{
throw new Exception("Unable to get a CGImage from a UIImage.");
}
bitmapContext.DrawImage(new CGRect(CGPoint.Empty, image.Size), image.CGImage);
using (var newImageRef = bitmapContext.ToImage()) {
resultingImage = new UIImage(newImageRef);
}
}
}
return(resultingImage);
}
public static UIImage MakeCalendarBadge(UIImage template, string smallText, string bigText)
{
using (var cs = CGColorSpace.CreateDeviceRGB()){
using (var context = new CGBitmapContext(IntPtr.Zero, 59, 58, 8, 59 * 4, cs, CGImageAlphaInfo.PremultipliedLast)){
//context.ScaleCTM (0.5f, -1);
context.TranslateCTM(0, 0);
context.DrawImage(new RectangleF(0, 0, 59, 58), template.CGImage);
context.SetFillColor(0, 0, 0, 1);
// The _small_ string
context.SelectFont("Helvetica-Bold", 14f, CGTextEncoding.MacRoman);
// Pretty lame way of measuring strings, as documented:
var start = context.TextPosition.X;
context.SetTextDrawingMode(CGTextDrawingMode.Invisible);
context.ShowText(smallText);
var width = context.TextPosition.X - start;
context.SetTextDrawingMode(CGTextDrawingMode.Fill);
context.ShowTextAtPoint((59 - width) / 2, 10, smallText); // was 46
// The BIG string
context.SelectFont("Helvetica-Bold", 32, CGTextEncoding.MacRoman);
start = context.TextPosition.X;
context.SetTextDrawingMode(CGTextDrawingMode.Invisible);
context.ShowText(bigText);
width = context.TextPosition.X - start;
context.SetFillColor(0, 0, 0, 1);
context.SetTextDrawingMode(CGTextDrawingMode.Fill);
context.ShowTextAtPoint((59 - width) / 2, 25, bigText); // was 9
context.StrokePath();
return(UIImage.FromImage(context.ToImage()));
}
}
}
/// <summary>
/// This is an expensive call. Used by preview thumbnail.
/// </summary>
/// <returns>The (processed) video frame, as a UIImage.</returns>
/// <param name="imageBuffer">The (processed) video frame.</param>
public static UIImage ImageBufferToUIImage(CVPixelBuffer imageBuffer)
{
imageBuffer.Lock(CVPixelBufferLock.None);
var baseAddress = imageBuffer.BaseAddress;
var bytesPerRow = imageBuffer.BytesPerRow;
var width = imageBuffer.Width;
var height = imageBuffer.Height;
var colorSpace = CGColorSpace.CreateDeviceRGB();
var bitmapInfo = (uint)CGImageAlphaInfo.NoneSkipFirst | (uint)CGBitmapFlags.ByteOrder32Little;
using (var context = new CGBitmapContext(baseAddress, width, height, 8, bytesPerRow, colorSpace, (CGImageAlphaInfo)bitmapInfo))
{
var quartzImage = context?.ToImage();
imageBuffer.Unlock(CVPixelBufferLock.None);
var image = new UIImage(quartzImage, 1.0f, UIImageOrientation.Up);
return(image);
}
}
public static UIImage MaskeWithColor(this UIImage image, UIColor color)
{
var maskImage = image.CGImage;
var width = image.Size.Width;
var height = image.Size.Height;
var bounds = new CGRect(0, 0, width, height);
using (var colorSpace = CGColorSpace.CreateDeviceRGB())
{
using (var bitmapContext = new CGBitmapContext(null, (nint)width, (nint)height, 8, 0, colorSpace, CGImageAlphaInfo.PremultipliedLast))
{
bitmapContext.ClipToMask(bounds, maskImage);
bitmapContext.SetFillColor(color.CGColor);
bitmapContext.FillRect(bounds);
using (var cImage = bitmapContext.ToImage())
{
var coloredImage = UIImage.FromImage(cImage);
return(coloredImage);
}
}
}
}
public override void DrawInContext(CGContext ctx)
{
var size = Frame.Size;
Point center;
nfloat radius;
if (_isRelative)
{
center = new Point(_center.X * size.Width, _center.Y * size.Height);
radius = (nfloat)(_radius * size.Width + _radius * size.Height) / 2.0f; // We take the avg
}
else
{
center = _center;
radius = _radius;
}
var gradient = new CGGradient(CGColorSpace.CreateDeviceRGB(), _colors, _locations);
var startCenter = new CGPoint(center.X, center.Y);
ctx.DrawRadialGradient(gradient, startCenter, 0, startCenter, radius, CGGradientDrawingOptions.DrawsAfterEndLocation);
}
protected override void AddPageImpl(float width, float height)
{
if (_closed)
{
throw new Exception("Unable to add a page because the PDFContext is already closed.");
}
if (_tempFilePath == null)
{
_tempFilePath = Path.GetTempFileName();
UIGraphics.BeginPDFContext(_tempFilePath, CGRect.Empty, _documentInfo);
}
var pageInfo = new NSMutableDictionary();
UIGraphics.BeginPDFPage(new CGRect(0, 0, width, height), pageInfo);
var context = UIGraphics.GetCurrentContext();
context.SetFillColorSpace(CGColorSpace.CreateDeviceRGB());
context.SetStrokeColorSpace(CGColorSpace.CreateDeviceRGB());
_canvas.Context = context;
}
public void CreateDeviceRGB()
{
using (var cs = CGColorSpace.CreateDeviceRGB()) {
Assert.That(cs.Components, Is.EqualTo((nint)3), "3");
Assert.That(cs.Model, Is.EqualTo(CGColorSpaceModel.RGB), "RGB");
Assert.Null(cs.GetBaseColorSpace(), "GetBaseColorSpace");
// not indexed so no color table
Assert.That(cs.GetColorTable().Length, Is.EqualTo(0), "GetColorTable");
#if NET
Assert.Null(cs.GetIccProfile(), "GetIccProfile");
#else
Assert.Null(cs.GetICCProfile(), "GetICCProfile");
#endif
if (TestRuntime.CheckXcodeVersion(8, 0))
{
// kCGColorSpaceDeviceRGB is not a public constant
Assert.That(cs.Name, Is.EqualTo("kCGColorSpaceDeviceRGB"), "Name");
Assert.False(cs.IsWideGamutRgb, "IsWideGamutRgb");
Assert.True(cs.SupportsOutput, "SupportsOutput");
Assert.Null(cs.GetIccData(), "GetIccData");
}
}
}
/// <summary>
/// Converts raw image data from a CMSampleBugger into a CGImage.
/// </summary>
/// <returns>The image from sample buffer.</returns>
/// <param name="sampleBuffer">Sample buffer.</param>
static CGImage GetImageFromSampleBuffer(CMSampleBuffer sampleBuffer)
{
// Get the CoreVideo image
using (var pixelBuffer = sampleBuffer.GetImageBuffer() as CVPixelBuffer)
{
pixelBuffer.Lock(CVPixelBufferLock.None);
var baseAddress = pixelBuffer.BaseAddress;
int bytesPerRow = (int)pixelBuffer.BytesPerRow;
int width = (int)pixelBuffer.Width;
int height = (int)pixelBuffer.Height;
var flags = CGBitmapFlags.PremultipliedFirst | CGBitmapFlags.ByteOrder32Little;
// Create a CGImage on the RGB colorspace from the configured parameter above
using (var cs = CGColorSpace.CreateDeviceRGB())
using (var context = new CGBitmapContext(baseAddress, width, height, 8, bytesPerRow, cs, (CGImageAlphaInfo)flags))
{
var cgImage = context.ToImage();
pixelBuffer.Unlock(CVPixelBufferLock.None);
return(cgImage);
}
}
}
public void Present()
{
_bitmap.LockPixels();
IntPtr length;
var pixels = _bitmap.GetPixels(out length);
const int bitmapInfo = ((int)CGBitmapFlags.ByteOrder32Big) | ((int)CGImageAlphaInfo.PremultipliedLast);
var bounds = GetApplicationFrame();
var statusBarOffset = UIScreen.MainScreen.Bounds.Height - bounds.Height;
using (var colorSpace = CGColorSpace.CreateDeviceRGB())
using (var bContext = new CGBitmapContext(pixels, _bitmap.Width, _bitmap.Height, 8, _bitmap.Width * 4, colorSpace, (CGImageAlphaInfo)bitmapInfo))
using (var image = bContext.ToImage())
using (var context = UIGraphics.GetCurrentContext())
{
// flip the image for CGContext.DrawImage
context.TranslateCTM(0, bounds.Height + statusBarOffset);
context.ScaleCTM(1, -1);
context.DrawImage(bounds, image);
}
_bitmap.UnlockPixels();
}
protected override NSImage Transform(NSImage sourceBitmap, string path, ImageSource source, bool isPlaceholder, string key)
{
var colorSpace = CGColorSpace.CreateDeviceRGB();
const int bytesPerPixel = 4;
int width = (int)sourceBitmap.CGImage.Width;
int height = (int)sourceBitmap.CGImage.Height;
var bytes = new byte[width * height * bytesPerPixel];
int bytesPerRow = bytesPerPixel * width;
const int bitsPerComponent = 8;
using (var context = new CGBitmapContext(bytes, width, height, bitsPerComponent, bytesPerRow, colorSpace, CGBitmapFlags.PremultipliedLast | CGBitmapFlags.ByteOrder32Big))
{
CGRect drawRect = new CGRect(0.0, 0.0, sourceBitmap.Size.Width, sourceBitmap.Size.Height);
context.SetFillColor(HexColor.ToUIColor().CGColor);
context.FillRect(drawRect);
context.DrawImage(drawRect, sourceBitmap.CGImage);
using (var output = context.ToImage())
{
return(new NSImage(output, CGSize.Empty));
}
}
}
