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Description
The WriteableBitmapEx library is a collection of extension methods for the . The WriteableBitmap class is available for all XAML flavors including Windows Phone, WPF, WinRT Windows Store XAML, (Windows 10) UWP and Silverlight. It allows the direct manipulation of a bitmap and can be used for image manipulation,
to generate fast procedural images by drawing directly to a bitmap and more.
The WriteableBitmap API is very minimalistic and there's only the raw
array for such operations. The WriteableBitmapEx library tries to compensate that with extensions methods that are easy to use like built in methods and offer
like functionality. The library extends the WriteableBitmap class with elementary and fast (2D drawing) functionality, conversion methods and functions to combine (blit) WriteableBitmaps.
The extension methods are grouped into different C# files using a partial class approach. It is possible to include just a few methods by using the specific source code files directly or the full functionality via the built binaries.
The latest binaries are always available as .
WriteableBitmapEx was also ported to .
for a list of features that will be added in the future. Please use the
to add new issues which are not already reported.
like drawing functionality for the WriteableBitmap.
Support for Windows Phone Silverlight, Windows Phone WinRT, desktop Silverlight, WPF, Windows 8/8.1 WinRT XAML and Windows 10 UWP.
Support for the
(alpha premultiplication will be performed) Also overloads for faster int32 as color (assumed to be already alpha premultiplied)
SetPixel method with various overloads GetPixel method to get the pixel color at a specified x, y coordinate Fast Clear methods Fast Clone method to copy a WriteableBitmap ForEach method to apply a given function to all pixels of the bitmap
Transformation
Crop method to extract a defined region Resize method with support for bilinear interpolation and nearest neighbor Rotate in 90& steps clockwise and any arbitrary angle Flip vertical and horizontal
Fast line drawing algorithms including various anti-aliased algorithm Variable stroke thickness and penned / stamp lines Ellipse, polyline, quad, rectangle and triangle Cubic Bezi&r, Cardinal spline and closed curves
Filled shapes
Fast ellipse and rectangle fill method Triangle, quad, simple and complex polygons Bezi&r and Cardinal spline curves
Different blend modes including alpha, additive, subtractive, multiply, mask and none
Optimized fast path for non blended blitting
Convolution, Blur Brightness, contrast, gamma adjustments Gray/brightness, invert
Conversion
Convert a WriteableBitmap to a byte array Create a WriteableBitmap from a byte array Create a WriteableBitmap easily from the application resource or content Create a WriteableBitmap from an any platform supported image stream Write a WriteableBitmap as a
to a stream Separate extension method to save as a . Download
Windows Phone specific methods
Save to media library and the camera roll
External Code
Live samples
Silverlight samples that show the WriteableBitmapEx in action:
includes various scenarios where different shapes are drawn. By default a little demo is shown called &Breathing Flower&. Basically different sized circles rotating around a center ring are generated. The sample also contains a static
page showing some of the possible shapes. The
starts with a demo that animates the Cardinal spline's tension of the FillCurveClosed method, plus some random animated filled ellipses. The sample also contains a static page showing some of the possible filled shapes.
demonstrates the Bezi&r and Cardinal spline methods. The sample starts with a demo animation that uses the Cardinal spline DrawCurve method to draw an artificial plant that grows procedurally. The other part of the sample is interactive
and allows to draw and manipulate Bezi&r and Cardinal splines with the mouse. See
for further information. The
combines WriteableBitmaps and shows a neat particle effect.
Video of the .
External resources:
Adam Kinney made a
that uses the WriteableBitmapEx library to dynamically apply a torn weathered effect to a photo.
Erik Klimczak from Calrity Consulting wrote a very good blog post about . He uses the WriteableBitmapEx to get the best performance.
Peter Bromberg wrote a great article called .
Performance!
The WriteableBitmapEx methods are much faster than the XAML
subclasses. For example, the WriteableBitmapEx line drawing approach is more than 20-30 times faster than the Silverlight
element. If a lot of shapes need to be drawn, the WriteableBitmapEx methods are the right choice.
Easy to use!
// Initialize the WriteableBitmap with size 512x512 and set it as source of an Image control
WriteableBitmap writeableBmp = BitmapFactory.New(512, 512);
ImageControl.Source = writeableB
using(writeableBmp.GetBitmapContext()){
// Load an image from the calling Assembly's resources via the relative path
writeableBmp = BitmapFactory.New(1, 1).FromResource(&Data/flower2.png&);
// Clear the WriteableBitmap with white color
writeableBmp.Clear(Colors.White);
// Set the pixel at P(10, 13) to black
writeableBmp.SetPixel(10, 13, Colors.Black);
// Get the color of the pixel at P(30, 43)
Color color = writeableBmp.GetPixel(30, 43);
// Green line from P1(1, 2) to P2(30, 40)
writeableBmp.DrawLine(1, 2, 30, 40, Colors.Green);
// Line from P1(1, 2) to P2(30, 40) using the fastest draw line method
int[] pixels = writeableBmp.P
int w = writeableBmp.PixelW
int h = writeableBmp.PixelH
WriteableBitmapExtensions.DrawLine(pixels, w, h, 1, 2, 30, 40, myIntColor);
// Blue anti-aliased line from P1(10, 20) to P2(50, 70) with a stroke of 5
writeableBmp.DrawLineAa(10, 20, 50, 70, Colors.Blue, 5);
// Black triangle with the points P1(10, 5), P2(20, 40) and P3(30, 10)
writeableBmp.DrawTriangle(10, 5, 20, 40, 30, 10, Colors.Black);
// Red rectangle from the point P1(2, 4) that is 10px wide and 6px high
writeableBmp.DrawRectangle(2, 4, 12, 10, Colors.Red);
// Filled blue ellipse with the center point P1(2, 2) that is 8px wide and 5px high
writeableBmp.FillEllipseCentered(2, 2, 8, 5, Colors.Blue);
// Closed green polyline with P1(10, 5), P2(20, 40), P3(30, 30) and P4(7, 8)
int[] p = new int[] { 10, 5, 20, 40, 30, 30, 7, 8, 10, 5 };
writeableBmp.DrawPolyline(p, Colors.Green);
// Cubic Bezi&r curve from P1(5, 5) to P4(20, 7)
// with the control points P2(10, 15) and P3(15, 0)
writeableBmp.DrawBezier(5, 5, 10, 15, 15, 0, 20, 7,
Colors.Purple);
// Cardinal spline with a tension of 0.5
// through the points P1(10, 5), P2(20, 40) and P3(30, 30)
int[] pts = new int[] { 10, 5, 20, 40, 30, 30};
writeableBmp.DrawCurve(pts, 0.5,
Colors.Yellow);
// A filled Cardinal spline with a tension of 0.5
// through the points P1(10, 5), P2(20, 40) and P3(30, 30)
writeableBmp.FillCurveClosed(pts, 0.5,
Colors.Green);
// Blit a bitmap using the additive blend mode at P1(10, 10)
writeableBmp.Blit(new Point(10, 10), bitmap, sourceRect, Colors.White, WriteableBitmapExtensions.BlendMode.Additive);
// Override all pixels with a function that changes the color based on the coordinate
writeableBmp.ForEach((x, y, color) =& Color.FromArgb(color.A, (byte)(color.R / 2), (byte)(x * y), 100));
} // Invalidate and present in the Dispose call
// Take snapshot
var clone = writeableBmp.Clone();
// Save to a TGA image stream (file for example)
writeableBmp.WriteTga(stream);
// Crops the WriteableBitmap to a region starting at P1(5, 8) and 10px wide and 10px high
var cropped = writeableBmp.Crop(5, 8, 10, 10);
// Rotates a copy of the WriteableBitmap 90 degress clockwise and returns the new copy
var rotated = writeableBmp.Rotate(90);
// Flips a copy of the WriteableBitmap around the horizontal axis and returns the new copy
var flipped = writeableBmp.Flip(FlipMode.Horizontal);
// Resizes the WriteableBitmap to 200px wide and 300px high using bilinear interpolation
var resized = writeableBmp.Resize(200, 300, WriteableBitmapExtensions.Interpolation.Bilinear);
Additional Information
The WriteableBitmapEx library has its origin in several blog posts that also describe the implemenation and usage of some aspects in detail. The blog posts might be seen as the documentation.&
introduced the SetPixel methods.&
provided the DrawLine methods.&
brought the shape functionality (ellipse, polyline, quad, rectangle, triangle).&
came with the byte array conversion methods and hows how to encode / decode a WriteableBitmap to JPEG.&
provided the Blit functions.&
announced this project.&
provided the original TgaWrite function.&
announced version 0.9.0.0 and gives some further information about the curve sample.&
introtuced the WriteableBitmapEx version for the Windows Phone and a sample.&
announced version 0.9.5.0, has some information about the new Fill methods and comes with a nice sample.&
announced version 1.0.0.0 and provides some background about the WinRT Metro Style version.&
Support it
started this project, maintains it and provided most of the code.&
wrote the Blit methods.&
added some Blending modes to the Blit method.&
contributed the ForEach method.&
proposed an optimization of the Clear(Color) method.&
suggested the Color Keying BlendMode.&&&
fixed a bug in the Blit alpha blending.&
John Ng San Ping added the AdjustBrightness, Contrast and Gray methods.&
Your name here? We are always looking for valuable contributions.&&&
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