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WMCreateApplicationIconBlendedPixmap() to avoid confusion. This is because this function does generate a new WMPixmap from the available icon image by combining it with the specified color and you need to call WMReleasePixmap() on the generated pixmap after you're done with it. This is unlike the case of WMGetApplicationIconPixmap() where it just returns a pointer to the existing application icon pixmap that was set before and where you don't need to release it after you're done working with it. To avoid this confusion about when you need to release and when not, one is using Get (get existing, no release needed), while the other is now using Create (generate a new pixmap, release required) in their name. Since this change was made to a function that was just added to the API in the previous commit, no modification is needed to the existing applications that use WINGs.
78 lines
3.3 KiB
Plaintext
78 lines
3.3 KiB
Plaintext
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*** Sat Apr 21 09:12:09 EEST 2001 -Dan
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API change
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----------
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To allow a correct display of icon images with alpha blending in panels and
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other places where a WINGs based application may use them the following
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changes took place:
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1. The following functions were renamed:
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- WMSetApplicationIconImage() --> WMSetApplicationIconPixmap()
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- WMGetApplicationIconImage() --> WMGetApplicationIconPixmap()
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- WMSetWindowMiniwindowImage() --> WMSetWindowMiniwindowPixmap()
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2. The following functions were added:
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- WMSetApplicationIconImage(WMScreen *scr, RImage *image)
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- RImage* WMGetApplicationIconImage(WMScreen *scr)
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- WMPixmap* WMCreateApplicationIconBlendedPixmap(WMScreen *scr, RColor *col)
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As you can see the old functions that operated on WMPixmap images (which are
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basically X Pixmaps that lack alpha information) were renamed to ...Pixmap()
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to make them more suggestive about what they do and to make room for the
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new functions that operate on RImages (that hold alpha information).
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Since the corresponding WMGet... functions only retrieve the stored
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image/pixmap from the application, I'll outline how the WMSet...
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functions operate:
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All WM...IconPixmap() functions operate on WMPixmaps
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All WM...IconImage() functions operate on RImages
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- WMSetApplicationIconImage() will set the RImage to be used in panels
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and will also convert the RImage to a WMPixmap with a threshold of 128
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and will use that pixmap for the appicon image. If that doesn't satisfy
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you, you can make a call to WMSetApplicationIconPixmap() on your own to
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set whatever WMPixmap you see fit for the appicon.
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- WMSetApplicationIconPixmap() will set the WMPixmap to be used for the
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appicon and for the panels
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If you use only one of the above functions, the corresponding image/pixmap
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will be used everywhere where needed (panels and appicon), but the pixmap
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version will not be able to handle alpha blending correctly.
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If you use both WMSetApplicationIconImage() and WMSetApplicationIconPixmap()
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then the RImage will have priority in panels, and the WMPixmap will only be
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used for the appicon. This allows you to better control what icon is
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displayed in the appicon, in case the default conversion of the RImage to a
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pixmap with a threshold of 128 is not good enough, or in case you want a
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different icon to be shown in the appicon than in panels.
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Also this new function was added:
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- WMCreateApplicationIconBlendedPixmap() will use the RImage set with
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WMSetApplicationIconImage() if available and will blend it with the color
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you passed. This will make the image show well on a background of that
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color. If the RImage was not set it will return NULL. You need to call
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WMReleasePixmap() on it after you finish with it. Passing a NULL pointer
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instead of a color will make the RImage be blended with the default color
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of the WINGs widgets: '#aeaaae' making it suitable to be assigned to any
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WINGs widget.
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To make your existing code work as before all you need to do is to rename
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the following functions:
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- WMSetApplicationIconImage() --> WMSetApplicationIconPixmap()
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- WMGetApplicationIconImage() --> WMGetApplicationIconPixmap()
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- WMSetWindowMiniwindowImage() --> WMSetWindowMiniwindowPixmap()
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But if you want to take advantage of the new abilities to show alpha
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blended images you need to start using the new functions.
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