libqdutils/cb_utils.cpp

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#include "cb_utils.h"

/* get union of two rects into 3rd rect */
void getUnion(hwc_rect_t& rect1,hwc_rect_t& rect2, hwc_rect_t& irect) {
    irect.left   = min(rect1.left, rect2.left);
    irect.top    = min(rect1.top, rect2.top);
    irect.right  = max(rect1.right, rect2.right);
    irect.bottom = max(rect1.bottom, rect2.bottom);
}

using namespace android;
using namespace qhwc;
namespace qdutils {

int CBUtils::getuiClearRegion(hwc_display_contents_1_t* list,
          hwc_rect_t &clearWormholeRect, LayerProp *layerProp) {

    uint32_t last = list->numHwLayers - 1;
    hwc_rect_t fbFrame = list->hwLayers[last].displayFrame;

    Rect fbFrameRect(fbFrame.left,fbFrame.top,fbFrame.right,fbFrame.bottom);
    Region wormholeRegion(fbFrameRect);

    for (uint32_t i = 0 ; i < last; i++) {
        //TODO Work on using hwc clear instead of gpu for HWC_BLIT
        //If layer is marked for HWC_BLIT clear is done by GPU
        if(list->hwLayers[i].compositionType == HWC_BLIT)
            return 0;
        // need to take care only in per pixel blending.
        // Restrict calculation only for copybit layers.
        if((list->hwLayers[i].blending != HWC_BLENDING_NONE) ||
           !(layerProp[i].mFlags & HWC_COPYBIT))
            continue ;
        hwc_rect_t displayFrame = list->hwLayers[i].displayFrame;
        Rect tmpRect(displayFrame.left,displayFrame.top,displayFrame.right,
        displayFrame.bottom);
        Region tmpRegion(tmpRect);
        wormholeRegion.subtractSelf(wormholeRegion.intersect(tmpRegion));
    }
    if (wormholeRegion.isEmpty()) {
        return 0;
    }
    //TO DO :- 1. remove union and call clear for each rect.
    //      :- 2. support swap ract feature.
    Region::const_iterator it = wormholeRegion.begin();
    Region::const_iterator const end = wormholeRegion.end();
    while (it != end) {
        const Rect& r = *it++;
        hwc_rect_t tmpWormRect = {r.left,r.top,r.right,r.bottom};
        getUnion(clearWormholeRect, tmpWormRect, clearWormholeRect);

    }
    return 1;
}

}//namespace qdutils