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libgralloc: fix the calculation of fb virtual y resolution

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calculate the yresolution virtual according to the hole
introduced by 4k alignment of frame buffer.

CRs-fixed: 325134

(cherry picked from commit 464443a5d3b216e06e644d0e41c234490c3c46c2)

Change-Id: Id7a93e11e2f3c1d52a26ec3669a9d710c369bf41
This commit is contained in:
Prabhanjan Kandula 2012-03-17 00:57:49 +05:30 committed by Andrew Sutherland
parent e80c89a867
commit 70139de6a2
1 changed files with 7 additions and 5 deletions
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12
libgralloc/framebuffer.cpp
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@ -655,20 +655,22 @@ int mapFrameBufferLocked(struct private_module_t* module)
if (numberOfBuffers > NUM_FRAMEBUFFERS_MAX)
numberOfBuffers = NUM_FRAMEBUFFERS_MAX;
LOGE("We support %d buffers", numberOfBuffers);
LOGV("We support %d buffers", numberOfBuffers);
info.yres_virtual = info.yres * numberOfBuffers;
//consider the included hole by 4k alignment
uint32_t line_length = (info.xres * info.bits_per_pixel / 8);
info.yres_virtual = (size * numberOfBuffers) / line_length;
uint32_t flags = PAGE_FLIP;
if (ioctl(fd, FBIOPUT_VSCREENINFO, &info) == -1) {
info.yres_virtual = info.yres;
info.yres_virtual = size / line_length;
flags &= ~PAGE_FLIP;
LOGW("FBIOPUT_VSCREENINFO failed, page flipping not supported");
}
if (info.yres_virtual < info.yres * 2) {
if (info.yres_virtual < ((size * 2) / line_length) ) {
// we need at least 2 for page-flipping
info.yres_virtual = info.yres;
info.yres_virtual = size / line_length;
flags &= ~PAGE_FLIP;
LOGW("page flipping not supported (yres_virtual=%d, requested=%d)",
info.yres_virtual, info.yres*2);