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Make average GIF FPS approximately equal to lottie one #336

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Make average GIF FPS approximately equal to lottie one #336

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13 changes: 12 additions & 1 deletion example/lottie2gif.cpp
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
#include "gif.h"
#include <rlottie.h>

#include<cmath>
#include<iostream>
#include<string>
#include<vector>
Expand Down Expand Up @@ -82,14 +83,24 @@ class App {
auto player = rlottie::Animation::loadFromFile(fileName);
if (!player) return help();

const double averageDelay = 100 / player->frameRate();
const double averageDelayFractional = averageDelay - (int)averageDelay;
const int longFrameFrequency = averageDelayFractional > 0 ? (int)round(1 / averageDelayFractional) : 1;

// the most of gif viewers does not properly play gif with duration = 1
const size_t longFrameDuration = (size_t)std::max(2.0, ceil(averageDelay));
const size_t shortFrameDuration = (size_t)std::max(2.0, floor(averageDelay));

auto buffer = std::unique_ptr<uint32_t[]>(new uint32_t[w * h]);
size_t frameCount = player->totalFrame();

GifBuilder builder(gifName.data(), w, h, bgColor);
for (size_t i = 0; i < frameCount ; i++) {
rlottie::Surface surface(buffer.get(), w, h, w * 4);
player->renderSync(i, surface);
builder.addFrame(surface);

const auto currentDelay = i % longFrameFrequency ? shortFrameDuration : longFrameDuration;
builder.addFrame(surface, currentDelay);
}
return result();
}
Expand Down