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Added a note about how to implement cOsd::Flush() for true color OSDs

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This commit is contained in:
Klaus Schmidinger 2011-02-26 14:10:30 +01:00
parent 0b8356aa92
commit 750d98f1e6
1 changed files with 12 additions and 1 deletions
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13
osd.h
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@ -4,7 +4,7 @@
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: osd.h 2.7 2011/02/26 12:13:59 kls Exp $
* $Id: osd.h 2.8 2011/02/26 14:10:30 kls Exp $
*/
#ifndef __OSD_H
@ -895,6 +895,17 @@ public:
virtual void Flush(void);
///< Actually commits all data to the OSD hardware.
///< Flush() should return as soon as possible.
///< For a true color OSD using the default implementation with in memory
///< pixmaps, the Flush() function should basically do something like this:
///<
///< LOCK_PIXMAPS;
///< while (cPixmapMemory *pm = RenderPixmaps()) {
///< int w = pm->ViewPort().Width();
///< int h = pm->ViewPort().Height();
///< int d = w * sizeof(tColor);
///< MyOsdDrawPixmap(Left() + pm->ViewPort().X(), Top() + pm->ViewPort().Y(), pm->Data(), w, h, h * d);
///< delete pm;
///< }
};
#define MAXOSDIMAGES 64