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[core] Don't upload the FrameHistory texture in frames where it's not changing #9257

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Jun 13, 2017
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[core] Don't upload the FrameHistory texture in frames where it's not changing #9257

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d3b539e
[core] Don't upload the FrameHistory texture in frames where it's not…
jfirebaugh Jun 13, 2017
0966771
[core] Add consts
jfirebaugh Jun 13, 2017
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16 changes: 8 additions & 8 deletions src/mbgl/renderer/frame_history.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -37,17 +37,17 @@ void FrameHistory::record(const TimePoint& now, float zoom, const Duration& dura
}

for (int16_t z = 0; z <= 255; z++) {
std::chrono::duration<float> timeDiff = now - changeTimes[z];
int32_t opacityChange = (duration == Milliseconds(0) ? 1 : (timeDiff / duration)) * 255;
if (z <= zoomIndex) {
opacities.data[z] = util::min(255, changeOpacities[z] + opacityChange);
} else {
opacities.data[z] = util::max(0, changeOpacities[z] - opacityChange);
const std::chrono::duration<float> timeDiff = now - changeTimes[z];
const int32_t opacityChange = (duration == Milliseconds(0) ? 1 : (timeDiff / duration)) * 255;
const uint8_t opacity = z <= zoomIndex
? util::min(255, changeOpacities[z] + opacityChange)
: util::max(0, changeOpacities[z] - opacityChange);
if (opacities.data[z] != opacity) {
opacities.data[z] = opacity;
dirty = true;
}
}

dirty = true;

if (zoomIndex != previousZoomIndex) {
previousZoomIndex = zoomIndex;
previousTime = now;
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