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Add GRALLOC_FRAMEBUFFER_NUM configuration

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Add config to set the NUM_BUFFERS. Set NUM_BUFFERS to 1 can
prevent page flipping and set it to a larger number can allow
userspace to fill up the following frame earlier.

Bug: 205917753
Change-Id: Ibf4a52a1e35f4a2404008a48b637cb82c4b46365
This commit is contained in:
YiMing Tseng 2021-11-11 14:05:30 +08:00 committed by Yi-ming Tseng
parent dbf2545214
commit 0b5ab223e1
2 changed files with 8 additions and 2 deletions
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3
modules/gralloc/Android.mk
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@ -38,5 +38,8 @@ LOCAL_CFLAGS:= -DLOG_TAG=\"gralloc\" -Wno-missing-field-initializers
ifeq ($(TARGET_USE_PAN_DISPLAY),true)
LOCAL_CFLAGS += -DUSE_PAN_DISPLAY=1
endif
ifneq ($(GRALLOC_FRAMEBUFFER_NUM),)
LOCAL_CFLAGS += -DNUM_BUFFERS=$(GRALLOC_FRAMEBUFFER_NUM)
endif
include $(BUILD_SHARED_LIBRARY)

7
modules/gralloc/framebuffer.cpp
View file

@ -45,8 +45,10 @@
#define USE_PAN_DISPLAY 0
#endif
// numbers of buffers for page flipping
// Enabling page flipping by default
#ifndef NUM_BUFFERS
#define NUM_BUFFERS 2
#endif
enum {
@ -157,7 +159,8 @@ int mapFrameBufferLocked(struct private_module_t* module, int format)
info.activate = FB_ACTIVATE_NOW;
/*
* Request NUM_BUFFERS screens (at lest 2 for page flipping)
* Request NUM_BUFFERS screens
* To enable page flipping, NUM_BUFFERS should be at least 2.
*/
info.yres_virtual = info.yres * NUM_BUFFERS;