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Commit 2e48e9cd authored by John Dias's avatar John Dias Committed by android-build-merger
Browse files

Merge "sf: optimize luma sampling code" into qt-r1-dev 

am: f1218eeb

Change-Id: I51d7c96dfe8a720d3598a4347977ec0fc24e0561
parents 822f9c13 f1218eeb

services/surfaceflinger/RegionSamplingThread.cpp

+5 −5
Original line number Diff line number Diff line
@@ -258,7 +258,7 @@ void RegionSamplingThread::binderDied(const wp<IBinder>& who) { 


namespace {

// Using Rec. 709 primaries

float getLuma(float r, float g, float b) {

inline float getLuma(float r, float g, float b) {

    constexpr auto rec709_red_primary = 0.2126f;

    constexpr auto rec709_green_primary = 0.7152f;

    constexpr auto rec709_blue_primary = 0.0722f;
@@ -293,10 +293,10 @@ float sampleArea(const uint32_t* data, int32_t width, int32_t height, int32_t st 
        const uint32_t* rowBase = data + row * stride;

        for (int32_t column = area.left; column < area.right; ++column) {

            uint32_t pixel = rowBase[column];

            const float r = (pixel & 0xFF) / 255.0f;

            const float g = ((pixel >> 8) & 0xFF) / 255.0f;

            const float b = ((pixel >> 16) & 0xFF) / 255.0f;

            const uint8_t luma = std::round(getLuma(r, g, b) * 255.0f);

            const float r = pixel & 0xFF;

            const float g = (pixel >> 8) & 0xFF;

            const float b = (pixel >> 16) & 0xFF;

            const uint8_t luma = std::round(getLuma(r, g, b));

            ++brightnessBuckets[luma];

            if (brightnessBuckets[luma] > majoritySampleNum) return luma / 255.0f;

        }