Databases
StackOverflow2013
Postsdbo
POCreating a Clipping Mask using Graphics32
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POCreating a Clipping Mask using Graphics32
    primarykey
    data
    text
    <p>I'm using <a href="http://graphics32.org" rel="nofollow" title="Graphics32">Graphics32</a> for image processing. Looking at its capabilities, it strikes me that I've yet to see a proper implementation of a clipping mask. I do see the term "clipping" pop up here and there, but it seems to refer to something else.</p> <p>Simply put, I need one layer to function as a "peeking hole" to another; layer A should be projected onto layer B, but only where layer B is visible. (I see no further need to redefine what a clipping mask is.)</p> <p>If it were just the bitmap of that other layer that I'd like to present, it wouldn't be so hard to do - then I could use <a href="http://graphics32.org/news/newsgroups.php?art_group=graphics32.general&amp;article_id=7179" rel="nofollow">this trick</a> - but what complicates things, is that the bitmap of a layer does not tell much about what would be displayed by the layer; the layer can be:</p> <ul> <li>(partially) invisible (when out of the view)</li> <li>moved/stretched + optionally resampled</li> <li>rotated</li> </ul> <p>with no effects on its bitmap.</p> <p>Is it actually so that there is no ready implementation for this? Any suggestions for doing this myself?</p> <h1>Progress</h1> <p>I found some useful elements in the source of Graphics32. For example, using this declaration:</p> <pre><code>type TLayerAccess = class(TBitmapLayer); </code></pre> <p>to gain access to protected methods, I can call <code>TLayerAccess(ABitmapLayer).Paint(ABitmap32)</code> to have just this layer painted to a bitmap, exactly as it would to the screen.</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USThijs van Dien
    1. USThijs van Dien
    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. VO
      singulars
      1. POCreating a Clipping Mask using Graphics32
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POCreating a Clipping Mask using Graphics32
      1. USTLama
      1. VTFavorite
    3. VO
      singulars
      1. POCreating a Clipping Mask using Graphics32
      1. This table or related slice is empty.
      1. VTUpMod
    1. COgraphics32 uses 32nit bitmaps solely and it's the alpha channel of the bitmap that is used for blending. I do not know of another alpha field you can use (eg clipping area etc). You only have another "master alpha". I would. 1. determine alpha bitmap (all white, alpha channel is the clipping path in bitmap coordinates), multiply original bitmap into this one and then render bitmap into destination.
      singulars
      1. POCreating a Clipping Mask using Graphics32
      1. USRitsaert Hornstra
    2. COHow do you define what portions of layer B are visible ?
      singulars
      1. POCreating a Clipping Mask using Graphics32
      1. USiamjoosy
    3. CO@iamjoosy By where I can see it when it is drawn to the container (TImage32).
      singulars
      1. POCreating a Clipping Mask using Graphics32
      1. USThijs van Dien
 

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