swf2ass/image2ass.php

<?php

require_once __DIR__ . "/vendor/autoload.php";

function outputFrame($frame, $endFrame, $frameDurationMs) {
    foreach ($frame[2]->commands as $path) {
        /** @var \swf2ass\DrawPath $path */
        $line = new \swf2ass\ass\ASSLine();
        $line->objectId = 0;
        $line->layer = [$frame[0]];
        $line->start = $frame[1];
        $line->end = $endFrame;
        $line->style = "f";
        $line->name = $frame[3];
        $shape = $path->commands;

        $line->tags = [
            new \swf2ass\ass\borderTag(new \swf2ass\Vector2(0, 0)),
            new \swf2ass\ass\shadowTag(0),
            \swf2ass\ass\fillColorTag::fromStyleRecord($path->style)
        ];
        /*if($shape->getRecords()[0] instanceof \swf2ass\MoveRecord){
            $shape = (new \swf2ass\MatrixTransform(null, null, $shape->getRecords()[0]->to->multiply(-1)))->applyToShape($shape);
        }*/
        $line->tags[] = new \swf2ass\ass\positionTag(new \swf2ass\Vector2(0, 0), new \swf2ass\Vector2(0, 0), 1, 1);
        $line->tags[] = new \swf2ass\ass\drawTag($shape, 1);
        echo $line->encode($frameDurationMs) . PHP_EOL;
    }
}

$fps = 30;//30000 / 1001;//30;
$colorN = 2;
$pframeColorDistance = 16;

if (is_dir($argv[1])) {
    $frames = glob($argv[1] . "/*.png");
} else {
    $frames = [$argv[1]];
}
sort($frames);

/** @var \swf2ass\Color[][] $frameBuffer */
$frameBuffer = null;
$quantizedFrameBuffer = $frameBuffer;

$dynamicPalette = false;
$palette = [];
for ($i = 0; $i < $colorN; ++$i) {
    $palette[] = new \swf2ass\Color((int)round($i * (255 / ($colorN - 1))), (int)round($i * (255 / ($colorN - 1))), (int)round($i * (255 / ($colorN - 1))));
}


$frameNumber = 1;
$endFrame = 6522;
$lastFrameNumber = null;

$currentFrames = [];

/**
 * @param \swf2ass\Color $color
 * @param \swf2ass\Color[] $palette
 *
 * @return \swf2ass\Color
 */
function getClosestColor(\swf2ass\Color $color, array $palette) {
    $minColor = null;
    $minDistance = null;
    foreach ($palette as $c2) {
        if (($d = $c2->distance($color)) < $minDistance or $minColor === null) {
            $minColor = $c2;
            $minDistance = $d;
        }
    }
    return $minColor;
}

foreach ($frames as $frame) {
    if (count($frames) === 1 or preg_match("/([0-9]+)\\.png/", $frame, $matches) > 0) {
        if (count($frames) === 1) {
            $frameNumber = 0;
        } else {
            $frameNumber = ((int)ltrim($matches[1], "0"));
            if ($frameNumber > $endFrame) {
                $endFrame = $frameNumber;
            }
        }
        $im = new Imagick();
        $im->readImage($frame);
        $im->transformImageColorspace(Imagick::COLORSPACE_SRGB);
        $resolution = $im->getImageGeometry();
        $resX = $resolution["width"];
        $resY = $resolution["height"];

        $iframe = [];
        $quantizedIframe = [];
        $pframe = [];
        $quantizedPframe = [];

        for ($y = 0; $y < $resY; ++$y) {
            $iframe[$y] = [];
            $quantizedIframe[$y] = [];
            $pframe[$y] = [];
            $quantizedPframe[$y] = [];
            for ($x = 0; $x < $resX; ++$x) {
                $pixel = $im->getImagePixelColor($x, $y);
                $c = $pixel->getColor(2);
                $color = new \swf2ass\Color($c["r"], $c["g"], $c["b"], $c["a"] ?? 255);

                $iframe[$y][$x] = $color;
                if ($frameBuffer !== null and $frameBuffer[$y][$x]->distance($color) > $pframeColorDistance) {
                    $pframe[$y][$x] = $color;
                    $frameBuffer[$y][$x] = $pframe[$y][$x];
                }
            }
        }

        if ($dynamicPalette) {
            $im->quantizeImage($colorN, Imagick::COLORSPACE_SRGB, 0, false, true);
        }


        foreach ($iframe as $y => $row) {
            foreach ($row as $x => $color) {
                $pixel = $im->getImagePixelColor($x, $y);
                $c = $pixel->getColor(2);
                $color = new \swf2ass\Color($c["r"], $c["g"], $c["b"], $c["a"] ?? 255);


                if (!$dynamicPalette) {
                    $color = getClosestColor($color, $palette);
                }

                $quantizedIframe[$y][$x] = $color;
                if (isset($pframe[$y][$x]) and $quantizedFrameBuffer[$y][$x]->distance($color) > $pframeColorDistance) {
                    $quantizedPframe[$y][$x] = $color;
                    $quantizedFrameBuffer[$y][$x] = $color;
                }
            }
        }

        if ($lastFrameNumber === null) {
            $headerFps = $fps * 2;
            echo <<<ASSHEADER
[Script Info]
; Script generated by image2ass from swf2ass
; https://git.gammaspectra.live/WeebDataHoarder/swf2ass/
ScriptType: v4.00+
WrapStyle: 0
ScaledBorderAndShadow: yes
YCbCr Matrix: PC.709
PlayResX: $resX
PlayResY: $resY

[Aegisub Project Garbage]
Last Style Storage: Default
Video File: ?dummy:$headerFps:10000:$resX:$resY:160:160:160:c

[V4+ Styles]
Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
Style: f,Arial,1,&H00FFFFFF,&H000000FF,&H000000FF,&H000000FF,0,0,0,0,100,100,0,0,1,0,0,7,0,0,0,1

[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text

ASSHEADER;
        }

        fwrite(STDERR, "=== frame $frameNumber\n");

        $iframeSize = "---";

        $pframeRender = (new \swf2ass\BitmapConverter($quantizedPframe))->render(false);
        $pframePathCount = array_reduce($pframeRender->commands, function (int $item, \swf2ass\DrawPath $path){
            return $item + count($path->commands->getRecords());
        }, 0);

        if ($frameBuffer === null or $pframePathCount > 0) {
            $iframeRender = (new \swf2ass\BitmapConverter($quantizedIframe))->render(true);
            $iframePathCount = array_reduce($iframeRender->commands, function (int $item, \swf2ass\DrawPath $path){
                return $item + count($path->commands->getRecords());
            }, 0);
        }

        if ($frameBuffer === null or ($pframePathCount > 0 and $iframePathCount <= $pframePathCount)) {
            fwrite(STDERR, "   | IS IFRAME $frameNumber |$iframePathCount|$pframePathCount\n");
            $frameBuffer = $iframe;
            $quantizedFrameBuffer = $quantizedIframe;
            foreach ($currentFrames as $f) {
                outputFrame($f, $frameNumber, (1 / $fps) * 1000);
            }
            $currentFrames = [];

            $currentFrames[] = [$frameNumber, $frameNumber, $iframeRender, "i"];
        } else if ($pframePathCount > 0) {
            fwrite(STDERR, "   | IS PFRAME $frameNumber |$iframePathCount|$pframePathCount\n");
            $currentFrames[] = [$frameNumber, $frameNumber, $pframeRender, "p"];
        } else {

            fwrite(STDERR, "   | IS DROP $frameNumber |$iframePathCount|$pframePathCount\n");
        }

        $lastFrameNumber = $frameNumber;
    }
}
foreach ($currentFrames as $f) {
    outputFrame($f, $endFrame, (1 / $fps) * 1000);
}