Databases
StackOverflow2013
Postsdbo
POHow calcutale GraphicsStream Position of specific pixel on screen?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POHow calcutale GraphicsStream Position of specific pixel on screen?
    primarykey
    data
    text
    <p>How calculate position of specific pixel inside of graphics stream? This stream is screenshot of my primary monitor. Lets say I want position for pixel at: </p> <pre><code>0, 0 0, 10 10, 0 10, 10 </code></pre> <p>Im using DirectX 9 SDK.<br> Here is part of code what Im using(from <a href="http://www.codeproject.com/Articles/274461/Very-fast-screen-capture-using-DirectX-in-Csharp" rel="nofollow">this</a> tutorial) to calculate position: </p> <pre><code>const int Bpp = 4; int o = 20; int m = 8; int screenWidthMinusM = Screen.PrimaryScreen.Bounds.Width - m; int screenHeightMinusM = Screen.PrimaryScreen.Bounds.Height - m; int bx = (screenWidthMinusM - m) / 3 + m; int by = (screenHeightMinusM - m) / 3 + m; int bx2 = (screenWidthMinusM - m) * 2 / 3 + m; int by2 = (screenHeightMinusM - m) * 2 / 3 + m; long x, y; long pos; y = m; for (x = m; x &lt; screenWidthMinusM; x += o) { pos = (y * Screen.PrimaryScreen.Bounds.Width + x) * Bpp; if (x &lt; bx) tlPos.Add(pos); else if (x &gt; bx &amp;&amp; x &lt; bx2) tPos.Add(pos); else if (x &gt; bx2) trPos.Add(pos); } </code></pre> <p>but this returns collection with numbers starting about 53 000 to about 7 000 000(from another similar method). After that color is extracted </p> <pre><code>Surface s = sc.CaptureScreen(); GraphicsStream gs = s.LockRectangle(LockFlags.None); byte[] bu = new byte[4]; foreach (long pos in positions) { gs.Position = pos; gs.Read(bu, 0, 4); r += bu[2]; g += bu[1]; b += bu[0]; i++; } </code></pre> <p>I need to make my own collection containing these positions.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USmiky
    1. USmiky
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COI may make a mistake (don't know what's a `GraphicsStream`), but it depends on the Vertex Shader used and the `World`, `View`, `Projection` matrices. Could you specify what version of DirectX and DirectX wrapper do you use?
      singulars
      1. POHow calcutale GraphicsStream Position of specific pixel on screen?
      1. USCédric Bignon
    2. CODX9 and question was updated
      singulars
      1. POHow calcutale GraphicsStream Position of specific pixel on screen?
      1. USmiky
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload