From 0b5ab223e110f3a34b30e7b61e4ea68c03dba98b Mon Sep 17 00:00:00 2001 From: YiMing Tseng Date: Thu, 11 Nov 2021 14:05:30 +0800 Subject: Add GRALLOC_FRAMEBUFFER_NUM configuration 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 --- modules/gralloc/framebuffer.cpp | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) (limited to 'modules/gralloc/framebuffer.cpp') diff --git a/modules/gralloc/framebuffer.cpp b/modules/gralloc/framebuffer.cpp index b2ec3e44..fc220dbc 100644 --- a/modules/gralloc/framebuffer.cpp +++ b/modules/gralloc/framebuffer.cpp @@ -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; -- cgit v1.2.3