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os/surface.h: support windowed surface access

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This patch eases the vertical organization of multiple surfaces within
one larger surface, which is the case when keeping front/back buffers
within one compounding GUI buffer.

Issue #5351
This commit is contained in:
Norman Feske 2024-09-25 18:09:57 +02:00 committed by Christian Helmuth
parent bf064874db
commit 388218a3f9
1 changed files with 19 additions and 0 deletions
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repos/os/include/os/surface.h
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@ -22,6 +22,8 @@ namespace Genode {
class Surface_base;
template <typename> class Surface;
struct Surface_window { unsigned y, h; };
}
@ -133,6 +135,23 @@ class Genode::Surface : public Surface_base
*/
Surface(PT *addr, Area size)
: Surface_base(size, PT::format()), _addr(addr) { }
/**
* Call 'fn' with a sub-window surface as argument
*
* This method is useful for managing multiple surfaces within one
* larger surface, for example for organizing a back buffer and a front
* buffer within one virtual framebuffer.
*/
void with_window(Surface_window const win, auto const &fn) const
{
/* clip window coordinates against surface boundaries */
Rect const rect = Rect::intersect({ { 0, 0 }, { 1, size().h } },
{ { 0, int(win.y) }, { 1, win.h } });
Surface surface { _addr + rect.y1()*size().w, { size().w, rect.h() } };
fn(surface);
}
};
#endif /* _INCLUDE__OS__SURFACE_H_ */