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SurfaceFlinger: use async mode for video & cam

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This change makes SurfaceFlinger's SurfaceTexture objects default to
async mode whenever a camera or video decoder connects.  This behavior
can be disabled by #defining NEVER_DEFAULT_TO_ASYNC_MODE.

Change-Id: I8965951d1775915da180e4af298dd7af3afafecc
This commit is contained in:
Jamie Gennis 2011-07-30 15:06:10 -07:00
parent 8d944d254b
commit cb6c755234
3 changed files with 29 additions and 1 deletions
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2
services/surfaceflinger/Android.mk
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@ -22,7 +22,7 @@ ifeq ($(TARGET_BOARD_PLATFORM), omap3)
LOCAL_CFLAGS += -DNO_RGBX_8888
endif
ifeq ($(TARGET_BOARD_PLATFORM), s5pc110)
LOCAL_CFLAGS += -DHAS_CONTEXT_PRIORITY
LOCAL_CFLAGS += -DHAS_CONTEXT_PRIORITY -DNEVER_DEFAULT_TO_ASYNC_MODE
endif

26
services/surfaceflinger/SurfaceTextureLayer.cpp
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@ -86,6 +86,32 @@ status_t SurfaceTextureLayer::dequeueBuffer(int *buf,
return res;
}
status_t SurfaceTextureLayer::connect(int api) {
status_t err = SurfaceTexture::connect(api);
if (err == NO_ERROR) {
switch(api) {
case NATIVE_WINDOW_API_MEDIA:
case NATIVE_WINDOW_API_CAMERA:
// Camera preview and videos are rate-limited on the producer
// side. If enabled for this build, we use async mode to always
// show the most recent frame at the cost of requiring an
// additional buffer.
#ifndef NEVER_DEFAULT_TO_ASYNC_MODE
err = setSynchronousMode(false);
break;
#endif
// fall through to set synchronous mode when not defaulting to
// async mode.
deafult:
err = setSynchronousMode(true);
break;
}
if (err != NO_ERROR) {
disconnect(api);
}
}
return err;
}
// ---------------------------------------------------------------------------
}; // namespace android

2
services/surfaceflinger/SurfaceTextureLayer.h
View File

@ -50,6 +50,8 @@ protected:
virtual status_t dequeueBuffer(int *buf, uint32_t w, uint32_t h,
uint32_t format, uint32_t usage);
virtual status_t connect(int api);
};
// ---------------------------------------------------------------------------