LineageOS/android_vendor_qcom_opensource_display-commonsys-intf
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hal: adding support for DRC on WiFi display

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When Dynamic Resolution Change (DRC) is triggered in the WiFi display
    stack, it results in a PAUSE and a RESUME event. During DRC, the
    dimensions of the framebuffer are changed. To support DRC we need to:
    1. Check if a RESUME event is the result of a valid DRC event
    2. Reconfigure the display's attributes to reflect resolution change
    3. Enable MDP downscaling when necessary (Valid DRC cases)

Change-Id: Idc3cbc94de99a4a7299e2f6b26c3e35937c1d6c8
This commit is contained in:
Tatenda Chipeperekwa
2013-08-30 14:03:15 -07:00
parent dd29d9f238
commit 3368d08ed5
2 changed files with 43 additions and 13 deletions
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47
libvirtual/virtual.cpp
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@@ -76,6 +76,10 @@ void VirtualDisplay::getAttributes(int& width, int& height) {
int VirtualDisplay::teardown() {
closeFrameBuffer();
memset(&mVInfo, 0, sizeof(mVInfo));
// Reset the resolution when we close the fb for this device. We need
// this to distinguish between an ONLINE and RESUME event.
mHwcContext->dpyAttr[HWC_DISPLAY_VIRTUAL].xres = 0;
mHwcContext->dpyAttr[HWC_DISPLAY_VIRTUAL].yres = 0;
return 0;
}
@@ -92,24 +96,41 @@ VirtualDisplay::~VirtualDisplay()
void VirtualDisplay::setAttributes() {
if(mHwcContext) {
// Always set dpyAttr res to mVInfo res
mHwcContext->dpyAttr[HWC_DISPLAY_VIRTUAL].xres = mVInfo.xres;
mHwcContext->dpyAttr[HWC_DISPLAY_VIRTUAL].yres = mVInfo.yres;
unsigned int &w = mHwcContext->dpyAttr[HWC_DISPLAY_VIRTUAL].xres;
unsigned int &h = mHwcContext->dpyAttr[HWC_DISPLAY_VIRTUAL].yres;
// Always set dpyAttr res to mVInfo res, only on an ONLINE event. Keep
// the original configuration to cater for DRC initiated RESUME events
if(w == 0 || h == 0){
w = mVInfo.xres;
h = mVInfo.yres;
}
mHwcContext->dpyAttr[HWC_DISPLAY_VIRTUAL].mDownScaleMode = false;
if(!qdutils::MDPVersion::getInstance().is8x26()) {
uint32_t priW = mHwcContext->dpyAttr[HWC_DISPLAY_PRIMARY].xres;
uint32_t priH = mHwcContext->dpyAttr[HWC_DISPLAY_PRIMARY].yres;
// if primary resolution is more than the wfd resolution
// Find the maximum resolution between primary and virtual
uint32_t maxArea = max((w * h), (priW * priH));
// If primary resolution is more than the wfd resolution
// configure dpy attr to primary resolution and set
// downscale mode
if((priW * priH) > (mVInfo.xres * mVInfo.yres)) {
mHwcContext->dpyAttr[HWC_DISPLAY_VIRTUAL].xres = priW;
mHwcContext->dpyAttr[HWC_DISPLAY_VIRTUAL].yres = priH;
// WFD is always in landscape, so always assign the higher
// dimension to wfd's xres
if(priH > priW) {
mHwcContext->dpyAttr[HWC_DISPLAY_VIRTUAL].xres = priH;
mHwcContext->dpyAttr[HWC_DISPLAY_VIRTUAL].yres = priW;
// downscale mode.
// DRC is only valid when the original resolution on the WiFi
// display is greater than the new resolution in mVInfo.
if(maxArea > (mVInfo.xres * mVInfo.yres)) {
if(maxArea == (priW * priH)) {
// Here we account for the case when primary resolution is
// greater than that of the WiFi display
w = priW;
h = priH;
// WFD is always in landscape, so always assign the higher
// dimension to wfd's xres
if(priH > priW) {
w = priH;
h = priW;
}
}
// Set External Display MDP Downscale mode indicator
mHwcContext->dpyAttr[HWC_DISPLAY_VIRTUAL].mDownScaleMode = true;