refactored screenshot code

the core screenshot function now can capture the screen at any lower resolution
performing bilinear filtering.

we also now have some client code to interface with the screenshot service.

it's now possible to request a screenshot at a lower resolution.

Change-Id: I5a3b0e431421800e3aad601d9af8f94adffbc71f

1 files changed, 6 insertions, 0 deletions

diff --git a/services/surfaceflinger/LayerBase.cpp b/services/surfaceflinger/LayerBase.cpp
index 3d049a7961..14191cbc21 100644
--- a/services/surfaceflinger/LayerBase.cpp
+++ b/services/surfaceflinger/LayerBase.cpp
@@ -326,6 +326,12 @@ void LayerBase::draw(const Region& clip) const
     onDraw(clip);
 }
 
+void LayerBase::drawForSreenShot() const
+{
+    const DisplayHardware& hw(graphicPlane(0).displayHardware());
+    onDraw( Region(hw.bounds()) );
+}
+
 void LayerBase::clearWithOpenGL(const Region& clip, GLclampf red,
                                 GLclampf green, GLclampf blue,
                                 GLclampf alpha) const