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WindowServer: Detect framebuffer capabilities and settings

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The main changes are twofold:

* Buffer flipping is now controlled by the m_screen_can_set_buffer flag
  in WSCompositor. This flag, in turn, is impacted by m_can_set_buffer
  flag, in WSScreen. m_can_set_buffer is set in the WSScreen constructor
  by checking the return value of fb_set_buffer. If the framebuffer
  supports this operation, it will succeed, and we record this fact. This
  information is then used by WSCompositor to set its own
  m_screen_can_set_buffer flag.

* WSScreen now only requests a resolution change of the framebuffer. The
  driver itself is ultimately responsible for what resolution or mode is
  actually set, so WSScreen has to read the response from that request,
  and has no choice but to accept the answer. This allows the driver to
  choose a "close enough" value to what was requested, or simply ignore
  it.

The result of this is that there is no special configuration necessary
for WindowServer to work with reduced-capability framebuffer devices.
This commit is contained in:
Conrad Pankoff 2019-08-18 14:32:14 +10:00 • committed by Andreas Kling
parent 3932dfbb04
commit 23b6ef29dd
4 changed files with 68 additions and 51 deletions
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6
Servers/WindowServer/WSCompositor.h
View file

@ -27,7 +27,7 @@ public:
void invalidate();
void invalidate(const Rect&);
void set_resolution(int width, int height);
void set_resolution(int desired_width, int desired_height);
bool set_wallpaper(const String& path, Function<void(bool)>&& callback);
String wallpaper_path() const { return m_wallpaper_path; }
@ -35,10 +35,9 @@ public:
void invalidate_cursor();
Rect current_cursor_rect() const;
bool can_flip_buffers() const { return false; }
private:
WSCompositor();
void init_bitmaps();
void flip_buffers();
void flush(const Rect&);
void draw_cursor();
@ -52,6 +51,7 @@ private:
CTimer m_immediate_compose_timer;
bool m_flash_flush { false };
bool m_buffers_are_flipped { false };
bool m_screen_can_set_buffer { false };
RefPtr<GraphicsBitmap> m_front_bitmap;
RefPtr<GraphicsBitmap> m_back_bitmap;