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Framebuffer: Support variable number of framebuffers in the UI 

This change defines a macro NUM_FRAME_BUFFERS to set
the desired number of framebuffers to be used by the UI,
instead of hard-coding 2 framebuffers.

Aditional logic has been  added to handle the initialization
and destruction of NUM_FRAME_BUFFERS buffers.

Change-Id: I3a4bfec3e0f453432f2ffebf084c00f574d3be46
Signed-off-by: Rodrigo Obregon <robregon@ti.com>
This commit is contained in:
Rodrigo Obregon 2010-11-03 15:16:18 -05:00
parent 0e97e9a239
commit 71484f2f76
2 changed files with 26 additions and 18 deletions
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3
include/ui/FramebufferNativeWindow.h
View File

@ -29,6 +29,7 @@
#include <ui/egl/android_natives.h>
#define NUM_FRAME_BUFFERS 2
extern "C" EGLNativeWindowType android_createDisplaySurface(void);
@ -69,7 +70,7 @@ private:
framebuffer_device_t* fbDev;
alloc_device_t* grDev;
sp<NativeBuffer> buffers[2];
sp<NativeBuffer> buffers[NUM_FRAME_BUFFERS];
sp<NativeBuffer> front;
mutable Mutex mutex;

41
libs/ui/FramebufferNativeWindow.cpp
View File

@ -82,6 +82,7 @@ FramebufferNativeWindow::FramebufferNativeWindow()
if (hw_get_module(GRALLOC_HARDWARE_MODULE_ID, &module) == 0) {
int stride;
int err;
int i;
err = framebuffer_open(module, &fbDev);
LOGE_IF(err, "couldn't open framebuffer HAL (%s)", strerror(-err));
@ -95,27 +96,33 @@ FramebufferNativeWindow::FramebufferNativeWindow()
mUpdateOnDemand = (fbDev->setUpdateRect != 0);
// initialize the buffer FIFO
mNumBuffers = 2;
mNumFreeBuffers = 2;
mNumBuffers = NUM_FRAME_BUFFERS;
mNumFreeBuffers = NUM_FRAME_BUFFERS;
mBufferHead = mNumBuffers-1;
buffers[0] = new NativeBuffer(
fbDev->width, fbDev->height, fbDev->format, GRALLOC_USAGE_HW_FB);
buffers[1] = new NativeBuffer(
fbDev->width, fbDev->height, fbDev->format, GRALLOC_USAGE_HW_FB);
err = grDev->alloc(grDev,
fbDev->width, fbDev->height, fbDev->format,
GRALLOC_USAGE_HW_FB, &buffers[0]->handle, &buffers[0]->stride);
LOGE_IF(err, "fb buffer 0 allocation failed w=%d, h=%d, err=%s",
fbDev->width, fbDev->height, strerror(-err));
for (i = 0; i < mNumBuffers; i++)
{
buffers[i] = new NativeBuffer(
fbDev->width, fbDev->height, fbDev->format, GRALLOC_USAGE_HW_FB);
}
err = grDev->alloc(grDev,
fbDev->width, fbDev->height, fbDev->format,
GRALLOC_USAGE_HW_FB, &buffers[1]->handle, &buffers[1]->stride);
for (i = 0; i < mNumBuffers; i++)
{
err = grDev->alloc(grDev,
fbDev->width, fbDev->height, fbDev->format,
GRALLOC_USAGE_HW_FB, &buffers[i]->handle, &buffers[i]->stride);
LOGE_IF(err, "fb buffer 1 allocation failed w=%d, h=%d, err=%s",
fbDev->width, fbDev->height, strerror(-err));
LOGE_IF(err, "fb buffer %d allocation failed w=%d, h=%d, err=%s",
i, fbDev->width, fbDev->height, strerror(-err));
if (err)
{
mNumBuffers = i;
mNumFreeBuffers = i;
mBufferHead = mNumBuffers-1;
break;
}
}
const_cast<uint32_t&>(android_native_window_t::flags) = fbDev->flags;
const_cast<float&>(android_native_window_t::xdpi) = fbDev->xdpi;