void generate_alpha_mask(ScanlineRasToDestBitmapRenderer sclineRasToBmp, ScanlinePacked8 sclnPack, ScanlineRasterizer rasterizer, int width, int height)
{
//create 1 8-bits chanel (grayscale8) bmp
alphaBitmap = new ActualImage(width, height, PixelFormat.GrayScale8);
var bmpReaderWrtier = new MyImageReaderWriter();
bmpReaderWrtier.ReloadImage(alphaBitmap);
alphaMaskImageBuffer = new ChildImage(bmpReaderWrtier, new PixelBlenderGray(1));
//create mask from alpahMaskImageBuffer
alphaMask = new AlphaMaskByteClipped(alphaMaskImageBuffer, 1, 0);
#if USE_CLIPPING_ALPHA_MASK
//alphaMaskImageBuffer.AttachBuffer(alphaBitmap.GetBuffer(), 20 * width + 20, width - 40, height - 40, width, 8, 1);
#else
alphaMaskImageBuffer.attach(alphaByteArray, (int)cx, (int)cy, cx, 1);
#endif
var image = new ChildImage(alphaMaskImageBuffer, new PixelBlenderGray(1), 1, 0, 8);
ClipProxyImage clippingProxy = new ClipProxyImage(image);
clippingProxy.Clear(Drawing.Color.Black);
VertexSource.Ellipse ellipseForMask = new PixelFarm.Agg.VertexSource.Ellipse();
System.Random randGenerator = new Random(1432);
int i;
int num = (int)maskAlphaSliderValue;
var v1 = GetFreeVxs();
for (i = 0; i < num; i++)
{
if (i == num - 1)
{
//for the last one
ellipseForMask.Reset(Width / 2, Height / 2, 110, 110, 100);
rasterizer.AddPath(ellipseForMask.MakeVertexSnap(v1));
v1.Clear();
sclineRasToBmp.RenderWithColor(clippingProxy, rasterizer, sclnPack, Drawing.Color.Make(0, 0, 0, 255));
ellipseForMask.Reset(ellipseForMask.originX, ellipseForMask.originY, ellipseForMask.radiusX - 10, ellipseForMask.radiusY - 10, 100);
rasterizer.AddPath(ellipseForMask.MakeVertexSnap(v1));
v1.Clear();
sclineRasToBmp.RenderWithColor(clippingProxy, rasterizer, sclnPack, Drawing.Color.Make(255, 0, 0, 255));
}
else
{
ellipseForMask.Reset(randGenerator.Next() % width,
randGenerator.Next() % height,
randGenerator.Next() % 100 + 20,
randGenerator.Next() % 100 + 20,
100);
// set the color to draw into the alpha channel.
// there is not very much reason to set the alpha as you will get the amount of
// transparency based on the color you draw. (you might want some type of different edeg effect but it will be minor).
rasterizer.AddPath(ellipseForMask.MakeVxs(v1));
v1.Clear();
sclineRasToBmp.RenderWithColor(clippingProxy, rasterizer, sclnPack,
Drawing.Color.Make((int)((float)i / (float)num * 255), 0, 0, 255));
}
}
ReleaseVxs(ref v1);
}
void GenerateMaskWithWinGdiPlus(int w, int h)
{
//1. create 32 bits for mask image
this.a_alphaBmp = new System.Drawing.Bitmap(w, h);
//2. create graphics based on a_alphaBmp
using (System.Drawing.Graphics gfxBmp = System.Drawing.Graphics.FromImage(a_alphaBmp))
{
gfxBmp.Clear(System.Drawing.Color.Black);
//ClipProxyImage clippingProxy = new ClipProxyImage(image);
//clippingProxy.Clear(ColorRGBA.Black);
VertexSource.Ellipse ellipseForMask = new PixelFarm.Agg.VertexSource.Ellipse();
System.Random randGenerator = new Random(1432);
int num = (int)maskAlphaSliderValue;
int lim = num - 1;
for (int i = 0; i < lim; ++i)
{
ellipseForMask.Reset(randGenerator.Next() % w,
randGenerator.Next() % h,
randGenerator.Next() % 100 + 20,
randGenerator.Next() % 100 + 20,
100);
// set the color to draw into the alpha channel.
// there is not very much reason to set the alpha as you will get the amount of
// transparency based on the color you draw. (you might want some type of different edeg effect but it will be minor).
//rasterizer.AddPath(ellipseForMask.MakeVxs());
//sclineRasToBmp.RenderWithColor(clippingProxy, rasterizer, sclnPack,
// ColorRGBA.Make((int)((float)i / (float)num * 255), 0, 0, 255));
var v1 = GetFreeVxs();
VxsHelper.FillVxsSnap(gfxBmp, ellipseForMask.MakeVertexSnap(v1), Drawing.Color.Make((int)((float)i / (float)num * 255), 0, 0, 255));
ReleaseVxs(ref v1);
}
//the last one
ellipseForMask.Reset(Width / 2, Height / 2, 110, 110, 100);
//fill
var v2 = GetFreeVxs();
VxsHelper.FillVxsSnap(gfxBmp, ellipseForMask.MakeVertexSnap(v2), Drawing.Color.Make(0, 0, 0, 255));
v2.Clear();// reuse later
//rasterizer.AddPath(ellipseForMask.MakeVertexSnap());
//sclineRasToBmp.RenderWithColor(clippingProxy, rasterizer, sclnPack, new ColorRGBA(0, 0, 0, 255));
ellipseForMask.Reset(ellipseForMask.originX, ellipseForMask.originY, ellipseForMask.radiusX - 10, ellipseForMask.radiusY - 10, 100);
//rasterizer.AddPath(ellipseForMask.MakeVertexSnap());
//sclineRasToBmp.RenderWithColor(clippingProxy, rasterizer, sclnPack, new ColorRGBA(255, 0, 0, 255));
VxsHelper.FillVxsSnap(gfxBmp, ellipseForMask.MakeVertexSnap(v2), Drawing.Color.Make(255, 0, 0, 255));
ReleaseVxs(ref v2);
//for (i = 0; i < num; i++)
//{
// if (i == num - 1)
// {
// ellipseForMask.Reset(Width / 2, Height / 2, 110, 110, 100);
// //fill
// VxsHelper.DrawVxsSnap(gfxBmp, ellipseForMask.MakeVertexSnap(), new ColorRGBA(0, 0, 0, 255));
// //rasterizer.AddPath(ellipseForMask.MakeVertexSnap());
// //sclineRasToBmp.RenderWithColor(clippingProxy, rasterizer, sclnPack, new ColorRGBA(0, 0, 0, 255));
// ellipseForMask.Reset(ellipseForMask.originX, ellipseForMask.originY, ellipseForMask.radiusX - 10, ellipseForMask.radiusY - 10, 100);
// //rasterizer.AddPath(ellipseForMask.MakeVertexSnap());
// //sclineRasToBmp.RenderWithColor(clippingProxy, rasterizer, sclnPack, new ColorRGBA(255, 0, 0, 255));
// VxsHelper.DrawVxsSnap(gfxBmp, ellipseForMask.MakeVertexSnap(), new ColorRGBA(255, 0, 0, 255));
// }
// else
// {
// ellipseForMask.Reset(randGenerator.Next() % w,
// randGenerator.Next() % h,
// randGenerator.Next() % 100 + 20,
// randGenerator.Next() % 100 + 20,
// 100);
// // set the color to draw into the alpha channel.
// // there is not very much reason to set the alpha as you will get the amount of
// // transparency based on the color you draw. (you might want some type of different edeg effect but it will be minor).
// //rasterizer.AddPath(ellipseForMask.MakeVxs());
// //sclineRasToBmp.RenderWithColor(clippingProxy, rasterizer, sclnPack,
// // ColorRGBA.Make((int)((float)i / (float)num * 255), 0, 0, 255));
// VxsHelper.DrawVxsSnap(gfxBmp, ellipseForMask.MakeVertexSnap(), ColorRGBA.Make((int)((float)i / (float)num * 255), 0, 0, 255));
// }
//}
}
}