public static LinearGradientBrush Resolve(Drawing.LinearGradientBrush linearGradientBrush)
{
if (!(linearGradientBrush.InnerBrush is LinearGradientBrush glGradient))
{
//create a new one
Build(linearGradientBrush, out float[] v2f, out float[] colors);
glGradient = new LinearGradientBrush(v2f, colors);
linearGradientBrush.InnerBrush = glGradient;
}
return(glGradient);
}
/// <summary>
/// we do not store input linearGradient
/// </summary>
/// <param name="linearGradient"></param>
static void Build(Drawing.LinearGradientBrush linearGradient,
out float[] v2f,
out float[] colors)
{
ColorStop[] colorStops = linearGradient.ColorStops;
s_vertices.Clear();
s_v2fList.Clear();
s_colorList.Clear();
float x_1 = linearGradient.StartPoint.X;
float y_1 = linearGradient.StartPoint.Y;
double angleRad = linearGradient.Angle;
double totalLen = linearGradient.Length;
int pairCount = colorStops.Length - 1;
ColorStop c0 = ColorStop.Empty;
ColorStop c1 = ColorStop.Empty;
//create a simple horizontal linear gradient bar
//and we will rotate and translate it to target pos
for (int i = 0; i < pairCount; ++i)
{
c0 = colorStops[i];
c1 = colorStops[i + 1];
CalculateLinearGradientVxs(s_vertices,
i == 0,
i == pairCount - 1,
(float)(x_1 + (c0.Offset * totalLen)),
(float)((c1.Offset - c0.Offset) * totalLen),
c0,
c1);
}
var txMatrix = PixelFarm.CpuBlit.VertexProcessing.Affine.NewMatix(
PixelFarm.CpuBlit.VertexProcessing.AffinePlan.Translate(-x_1, -y_1),
PixelFarm.CpuBlit.VertexProcessing.AffinePlan.Rotate(angleRad),
PixelFarm.CpuBlit.VertexProcessing.AffinePlan.Translate(x_1, y_1)
);
//----------------------------------
int j = s_vertices.Count;
for (int m = 0; m < j; ++m)
{
VertexC4V3f v = s_vertices[m];
double v_x = v.x;
double v_y = v.y;
txMatrix.Transform(ref v_x, ref v_y);
//vrx[i] = new VertexC4V3f(v.color, (float)v_x, (float)v_y);
s_v2fList.Add((float)v_x);
s_v2fList.Add((float)v_y);
uint color = v.color;
//a,b,g,r
s_colorList.Add((color & 0xff) / 255f); //r
s_colorList.Add(((color >> 8) & 0xff) / 255f); //g
s_colorList.Add(((color >> 16) & 0xff) / 255f); //b
s_colorList.Add(((color >> 24) & 0xff) / 255f); //a
}
v2f = s_v2fList.ToArray();
colors = s_colorList.ToArray();
}
/// <summary>
/// we do not store input linearGradient
/// </summary>
/// <param name="linearGradient"></param>
static void Build(Drawing.LinearGradientBrush linearGradient,
out float[] v2f,
out float[] colors)
{
ColorStop[] colorStops = linearGradient.ColorStops;
s_vertices.Clear();
s_v2fList.Clear();
s_colorList.Clear();
float x_1 = linearGradient.StartPoint.X;
float y_1 = linearGradient.StartPoint.Y;
double angleRad = linearGradient.Angle;
double totalLen = linearGradient.Length;
int pairCount = colorStops.Length - 1;
ColorStop c0;
ColorStop c1;
//create a simple horizontal linear gradient bar
//and we will rotate and translate it to target pos
for (int i = 0; i < pairCount; ++i)
{
c0 = colorStops[i];
c1 = colorStops[i + 1];
CalculateLinearGradientVxs(s_vertices,
i == 0,
i == pairCount - 1,
(float)(x_1 + (c0.Offset * totalLen)),
(float)((c1.Offset - c0.Offset) * totalLen),
c0,
c1);
}
var txMatrix = AffineMat.Iden();
txMatrix.Rotate(angleRad, x_1, y_1); //rotate around x_1,y_1
int j = s_vertices.Count;
for (int m = 0; m < j; ++m)
{
ColorAndCoord v = s_vertices[m];
double v_x = v.x;
double v_y = v.y;
txMatrix.Transform(ref v_x, ref v_y);
s_v2fList.Add((float)v_x);
s_v2fList.Add((float)v_y);
Color color = v.color;
s_colorList.Add(color.R / 255f);
s_colorList.Add(color.G / 255f);
s_colorList.Add(color.B / 255f);
s_colorList.Add(color.A / 255f);
}
v2f = s_v2fList.ToArray();
colors = s_colorList.ToArray();
}
