/// <summary>
/// Sets the color of the pixel using an extra alpha value and a precalculated index (faster).
/// For best performance this method should not be used in iterative real-time scenarios. Implement the code directly inside a loop.
/// </summary>
/// <param name="bmp">The WriteableBitmap.</param>
/// <param name="index">The coordinate index.</param>
/// <param name="a">The alpha value of the color.</param>
/// <param name="color">The color.</param>
public static void SetPixeli(this BitmapBuffer bmp, int index, byte a, ColorInt color)
{
using (BitmapContext context = bmp.GetBitmapContext())
{
context.Pixels[index] = color.ToPreMultAlphaColor();
}
}
/// <summary>
/// Sets the color of the pixel.
/// For best performance this method should not be used in iterative real-time scenarios. Implement the code directly inside a loop.
/// </summary>
/// <param name="bmp">The WriteableBitmap.</param>
/// <param name="x">The x coordinate (row).</param>
/// <param name="y">The y coordinate (column).</param>
/// <param name="color">The color.</param>
public static void SetPixel(this BitmapBuffer bmp, int x, int y, ColorInt color)
{
using (BitmapContext context = bmp.GetBitmapContext())
{
context.Pixels[y * context.Width + x] = color.ToPreMultAlphaColor();
}
}
public static void Clear(this BitmapContext context, ColorInt color)
{
int colr = color.ToPreMultAlphaColor();
int[] pixels = context.Pixels;
int w = context.Width;
int h = context.Height;
int len = w * ARGB_SIZE;
// Fill first line
for (int x = 0; x < w; x++)
{
pixels[x] = colr;
}
// Copy first line
int blockHeight = 1;
int y = 1;
while (y < h)
{
BitmapContext.BlockCopy(context, 0, context, y * len, blockHeight * len);
y += blockHeight;
blockHeight = Math.Min(2 * blockHeight, h - y);
}
}
/// <summary>
/// Sets the color of the pixel using an extra alpha value.
/// For best performance this method should not be used in iterative real-time scenarios. Implement the code directly inside a loop.
/// </summary>
/// <param name="bmp">The WriteableBitmap.</param>
/// <param name="x">The x coordinate (row).</param>
/// <param name="y">The y coordinate (column).</param>
/// <param name="a">The alpha value of the color.</param>
/// <param name="color">The color.</param>
public static void SetPixel(this BitmapBuffer bmp, int x, int y, byte a, ColorInt color)
{
using (BitmapContext context = bmp.GetBitmapContext())
{
// Add one to use mul and cheap bit shift for multiplicaltion
context.Pixels[y * context.Width + x] = color.ToPreMultAlphaColor();
}
}
/// <summary>
/// Draws a colored line by connecting two points using the Bresenham algorithm.
/// </summary>
/// <param name="bmp">The WriteableBitmap.</param>
/// <param name="x1">The x-coordinate of the start point.</param>
/// <param name="y1">The y-coordinate of the start point.</param>
/// <param name="x2">The x-coordinate of the end point.</param>
/// <param name="y2">The y-coordinate of the end point.</param>
/// <param name="color">The color for the line.</param>
/// <param name="clipRect">The region in the image to restrict drawing to.</param>
public static void DrawLineBresenham(this BitmapBuffer bmp, int x1, int y1, int x2, int y2, ColorInt color, RectD?clipRect = null)
{
bmp.DrawLineBresenham(x1, y1, x2, y2, color.ToPreMultAlphaColor(), clipRect);
}
/// <summary>
/// Draws an anti-aliased line with a desired stroke thickness
/// <param name="bmp">The WriteableBitmap.</param>
/// <param name="x1">The x-coordinate of the start point.</param>
/// <param name="y1">The y-coordinate of the start point.</param>
/// <param name="x2">The x-coordinate of the end point.</param>
/// <param name="y2">The y-coordinate of the end point.</param>
/// <param name="color">The color for the line.</param>
/// <param name="strokeThickness">The stroke thickness of the line.</param>
/// </summary>
public static void DrawLineAa(this BitmapBuffer bmp, int x1, int y1, int x2, int y2, ColorInt color, int strokeThickness, RectD?clipRect = null)
{
using (BitmapContext context = bmp.GetBitmapContext())
{
AAWidthLine(bmp.PixelWidth, bmp.PixelHeight, context, x1, y1, x2, y2, strokeThickness, color.ToPreMultAlphaColor(), clipRect);
}
}
/// <summary>
/// Draws an anti-aliased line with a desired stroke thickness
/// <param name="context">The context containing the pixels as int RGBA value.</param>
/// <param name="x1">The x-coordinate of the start point.</param>
/// <param name="y1">The y-coordinate of the start point.</param>
/// <param name="x2">The x-coordinate of the end point.</param>
/// <param name="y2">The y-coordinate of the end point.</param>
/// <param name="color">The color for the line.</param>
/// <param name="strokeThickness">The stroke thickness of the line.</param>
/// </summary>
public static void DrawLineAa(BitmapContext context, int pixelWidth, int pixelHeight, int x1, int y1, int x2, int y2, ColorInt color, int strokeThickness, RectD?clipRect = null)
{
AAWidthLine(pixelWidth, pixelHeight, context, x1, y1, x2, y2, strokeThickness, color.ToPreMultAlphaColor(), clipRect);
}
/// <summary>
/// Draws a cubic Beziér spline defined by start, end and two control points.
/// </summary>
/// <param name="bmp">The WriteableBitmap.</param>
/// <param name="x1">The x-coordinate of the start point.</param>
/// <param name="y1">The y-coordinate of the start point.</param>
/// <param name="cx1">The x-coordinate of the 1st control point.</param>
/// <param name="cy1">The y-coordinate of the 1st control point.</param>
/// <param name="cx2">The x-coordinate of the 2nd control point.</param>
/// <param name="cy2">The y-coordinate of the 2nd control point.</param>
/// <param name="x2">The x-coordinate of the end point.</param>
/// <param name="y2">The y-coordinate of the end point.</param>
/// <param name="color">The color.</param>
public static void DrawBezier(this BitmapBuffer bmp, int x1, int y1, int cx1, int cy1, int cx2, int cy2, int x2, int y2, ColorInt color)
{
bmp.DrawBezier(x1, y1, cx1, cy1, cx2, cy2, x2, y2, color.ToPreMultAlphaColor());
}
/// <summary>
/// Draws a closed Cardinal spline (cubic) defined by a point collection.
/// The cardinal spline passes through each point in the collection.
/// </summary>
/// <param name="bmp">The WriteableBitmap.</param>
/// <param name="points">The points for the curve in x and y pairs, therefore the array is interpreted as (x1, y1, x2, y2, x3, y3, x4, y4, x1, x2 ..., xn, yn).</param>
/// <param name="tension">The tension of the curve defines the shape. Usually between 0 and 1. 0 would be a straight line.</param>
/// <param name="color">The color for the spline.</param>
public static void DrawCurveClosed(this BitmapBuffer bmp, int[] points, float tension, ColorInt color)
{
bmp.DrawCurveClosed(points, tension, color.ToPreMultAlphaColor());
}
/// <summary>
/// Draws a series of cubic Beziér splines each defined by start, end and two control points.
/// The ending point of the previous curve is used as starting point for the next.
/// Therefore the initial curve needs four points and the subsequent 3 (2 control and 1 end point).
/// </summary>
/// <param name="bmp">The WriteableBitmap.</param>
/// <param name="points">The points for the curve in x and y pairs, therefore the array is interpreted as (x1, y1, cx1, cy1, cx2, cy2, x2, y2, cx3, cx4 ..., xn, yn).</param>
/// <param name="color">The color for the spline.</param>
public static void DrawBeziers(this BitmapBuffer bmp, int[] points, ColorInt color)
{
bmp.DrawBeziers(points, color.ToPreMultAlphaColor());
}
