本文整理汇总了C#中CGBitmapContext.SetBlendMode方法的典型用法代码示例。如果您正苦于以下问题：C# CGBitmapContext.SetBlendMode方法的具体用法？C# CGBitmapContext.SetBlendMode怎么用？C# CGBitmapContext.SetBlendMode使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类CGBitmapContext的用法示例。
在下文中一共展示了CGBitmapContext.SetBlendMode方法的7个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: GetImagaDataFromPath
void GetImagaDataFromPath (string path)
{
int width, height;
NSImage src;
CGImage image;
CGContext context = null;
data = new byte[TEXTURE_WIDTH * TEXTURE_HEIGHT * 4];
src = new NSImage (path);
var rect = CGRect.Empty;
image = src.AsCGImage (ref rect, null, null);
width = (int) image.Width;
height = (int)image.Height;
CGImageAlphaInfo ai = CGImageAlphaInfo.PremultipliedLast;
context = new CGBitmapContext (data, width, height, 8, 4 * width, image.ColorSpace, ai);
// Core Graphics referential is upside-down compared to OpenGL referential
// Flip the Core Graphics context here
// An alternative is to use flipped OpenGL texture coordinates when drawing textures
context.TranslateCTM (0, height);
context.ScaleCTM (1, -1);
// Set the blend mode to copy before drawing since the previous contents of memory aren't used.
// This avoids unnecessary blending.
context.SetBlendMode (CGBlendMode.Copy);
context.DrawImage (new CGRect (0, 0, width, height), image);
}示例2: LoadImage
public static unsafe DemoImage LoadImage(string filePathName, bool flipVertical)
{
var imageClass = UIImage.FromFile(filePathName);
var cgImage = imageClass.CGImage;
if(cgImage == null)
{
return null;
}
var image = new DemoImage();
image.Width = cgImage.Width;
image.Height = cgImage.Height;
image.RowByteSize = image.Width * 4;
image.Data = new byte[cgImage.Height * image.RowByteSize];
image.Format = PixelInternalFormat.Rgba;
image.Type = PixelType.UnsignedByte;
fixed (byte *ptr = &image.Data [0]){
using(var context = new CGBitmapContext((IntPtr) ptr, image.Width, image.Height, 8, image.RowByteSize, cgImage.ColorSpace, CGImageAlphaInfo.NoneSkipLast))
{
context.SetBlendMode(CGBlendMode.Copy);
if(flipVertical)
{
context.TranslateCTM(0.0f, (float)image.Height);
context.ScaleCTM(1.0f, -1.0f);
}
context.DrawImage(new RectangleF(0f, 0f, image.Width, image.Height), cgImage);
}
}
return image;
}示例3: AdjustImage
public static UIImage AdjustImage (RectangleF rect, UIImage template, CGBlendMode mode,
float red, float green, float blue, float alpha)
{
using (var cs = CGColorSpace.CreateDeviceRGB ()) {
using (var context = new CGBitmapContext (IntPtr.Zero, (int)rect.Width, (int)rect.Height, 8,
(int)rect.Height * 4, cs, CGImageAlphaInfo.PremultipliedLast)) {
context.TranslateCTM (0.0f, 0f);
//context.ScaleCTM(1.0f,-1.0f);
context.DrawImage (rect, template.CGImage);
context.SetBlendMode (mode);
context.ClipToMask (rect, template.CGImage);
context.SetFillColor (red, green, blue, alpha);
context.FillRect (rect);
return UIImage.FromImage (context.ToImage ());
}
}
}示例4: LoadImage
public static void LoadImage(string filePathName, bool flipVertical)
{
var imageClass = UIImage.FromFile(filePathName);
var cgImage = imageClass.CGImage;
var Width = cgImage.Width;
var Height = cgImage.Height;
var RowByteSize = Width * 4;
var Data = new byte[cgImage.Height * cgImage.Width];
var Format = PixelInternalFormat.Rgba;
var Type = PixelType.UnsignedByte;
IntPtr dataPtr = Marshal.AllocHGlobal (cgImage.Height * cgImage.Width);
using(var context = new CGBitmapContext(dataPtr, Width, Height, 8, RowByteSize, cgImage.ColorSpace, CGImageAlphaInfo.NoneSkipLast))
{
context.SetBlendMode(CGBlendMode.Copy);
if(flipVertical)
{
context.TranslateCTM(0.0f, (float)Height);
context.ScaleCTM(1.0f, -1.0f);
}
context.DrawImage(new RectangleF(0f, 0f, Width, Height), cgImage);
}
if(dataPtr == IntPtr.Zero)
{
return;
}
else
{
Marshal.PtrToStructure(dataPtr, Data);
}
}示例5: TestRendering
/// <summary>
/// Executes rendering tests.
/// </summary>
/// <param name="embeddedResource">Embedded resource.</param>
private void TestRendering(string embeddedResource)
{
Log.TraceEvent("Test", TraceEventType.Information,
"Testing rendering.");
OsmSharp.Test.Performance.UI.Rendering.RenderingSerializedSceneTests<CGContextWrapper>.Test(
Assembly.GetExecutingAssembly().GetManifestResourceStream(
embeddedResource),
(width, height) =>
{
CGColorSpace space = CGColorSpace.CreateDeviceRGB ();
int bytesPerPixel = 4;
int bytesPerRow = bytesPerPixel * width;
int bitsPerComponent = 8;
CGBitmapContext target = new CGBitmapContext (null, width, height,
bitsPerComponent, bytesPerRow,
space, // kCGBitmapByteOrder32Little | kCGImageAlphaNoneSkipLast
CGBitmapFlags.PremultipliedFirst | CGBitmapFlags.ByteOrder32Big);
target.InterpolationQuality = CGInterpolationQuality.None;
target.SetShouldAntialias (false);
target.SetBlendMode (CGBlendMode.Copy);
target.SetAlpha (1);
return new CGContextWrapper(target, new CGRect(
0, 0, width, height));
},
() => {
return new CGContextRenderer (1);
});
}示例6: SetOriginalImage
public void SetOriginalImage(UIImage originalImage, CGRect cropFrame)
{
LoadIndicator.StartAnimating();
InvokeOnMainThread(() =>
{
CGImage imageRef = originalImage.CGImage;
UIImageOrientation imageOrientation = originalImage.Orientation;
if (imageRef == null)
return;
var bytesPerRow = 0;
var width = imageRef.Width;
var height = imageRef.Height;
var bitsPerComponent = imageRef.BitsPerComponent;
CGColorSpace colorSpace = CGColorSpace.CreateDeviceRGB();
CGBitmapFlags bitmapInfo = imageRef.BitmapInfo;
switch (imageOrientation)
{
case UIImageOrientation.RightMirrored:
case UIImageOrientation.LeftMirrored:
case UIImageOrientation.Right:
case UIImageOrientation.Left:
width = imageRef.Height;
height = imageRef.Width;
break;
default:
break;
}
CGSize imageSize = new CGSize(width, height);
CGBitmapContext context = new CGBitmapContext(null,
width,
height,
bitsPerComponent,
bytesPerRow,
colorSpace,
bitmapInfo);
colorSpace.Dispose();
if (context == null)
{
imageRef.Dispose();
return;
}
switch (imageOrientation)
{
case UIImageOrientation.RightMirrored:
case UIImageOrientation.Right:
context.TranslateCTM(imageSize.Width / 2, imageSize.Height / 2);
context.RotateCTM(-((nfloat)Math.PI / 2));
context.TranslateCTM(-imageSize.Height / 2, -imageSize.Width / 2);
break;
case UIImageOrientation.LeftMirrored:
case UIImageOrientation.Left:
context.TranslateCTM(imageSize.Width / 2, imageSize.Height / 2);
context.RotateCTM((nfloat)(Math.PI / 2));
context.TranslateCTM(-imageSize.Height / 2, -imageSize.Width / 2);
break;
case UIImageOrientation.Down:
case UIImageOrientation.DownMirrored:
context.TranslateCTM(imageSize.Width / 2, imageSize.Height / 2);
context.RotateCTM((nfloat)Math.PI);
context.TranslateCTM(-imageSize.Width / 2, -imageSize.Height / 2);
break;
default:
break;
}
context.InterpolationQuality = CGInterpolationQuality.High;
context.SetBlendMode(CGBlendMode.Copy);
context.DrawImage(new CGRect(0, 0, imageRef.Width, imageRef.Height), imageRef);
CGImage contextImage = context.ToImage();
context.Dispose();
if (contextImage != null)
{
_originalImage = UIImage.FromImage(contextImage, originalImage.CurrentScale, UIImageOrientation.Up);
contextImage.Dispose();
}
imageRef.Dispose();
BeginInvokeOnMainThread(() =>
{
CGSize convertedImageSize = new CGSize(_originalImage.Size.Width / _cropSizeRatio,
_originalImage.Size.Height / _cropSizeRatio);
ImageView.Alpha = 0;
ImageView.Image = _originalImage;
CGSize sampleImageSize = new CGSize(Math.Max(convertedImageSize.Width, ScrollView.Frame.Size.Width),
Math.Max(convertedImageSize.Height, ScrollView.Frame.Size.Height));
//.........这里部分代码省略.........
示例7: ProcessedImage
public UIImage ProcessedImage()
{
nfloat scale = UIScreen.MainScreen.Scale;
CGImage imageRef = _originalImage.CGImage;
if (imageRef == null)
return null;
var bytesPerRow = 0;
var bitsPerComponent = imageRef.BitsPerComponent;
CGColorSpace colorSpace = CGColorSpace.CreateDeviceRGB();
var bitmapInfo = imageRef.BitmapInfo;
CGBitmapContext context = new CGBitmapContext(null,
(nint)(_targetSize.Width * scale),
(nint)(_targetSize.Height * scale),
bitsPerComponent,
bytesPerRow,
colorSpace,
bitmapInfo);
colorSpace.Dispose();
if (context == null)
{
imageRef.Dispose();
return null;
}
CGRect targetFrame = LocalCropFrame();
context.InterpolationQuality = CGInterpolationQuality.High;
context.SetBlendMode(CGBlendMode.Copy);
context.DrawImage(targetFrame, imageRef);
var contextImage = context.ToImage();
UIImage finalImage = null;
context.Dispose();
if (contextImage != null)
{
finalImage = UIImage.FromImage(contextImage, scale, UIImageOrientation.Up);
contextImage.Dispose();
}
imageRef.Dispose();
return finalImage;
}