mirror of https://github.com/adamdruppe/arsd.git
Templatize bilinear up/down scaler
This commit is contained in:
Elias Batek
parent
7f91abfc0a
commit
31308e0777
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@ -3019,13 +3019,7 @@ private void scaleToImpl(ScalingFilter filter)(const Pixmap source, Pixmap targe
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// ==== Bilinear ====
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static if ((filter == ScalingFilter.bilinear) || (filter == ScalingFilter.fauxLinear)) {
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const Size delta = (target.size - source.size);
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const ScalingDirection[2] directions = [
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scalingDirectionFromDelta(delta.width),
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scalingDirectionFromDelta(delta.height),
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];
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void scaleToLinearImpl(ScalingDirection directionX, ScalingDirection directionY)() {
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auto dst = PixmapScannerRW(target);
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size_t y = 0;
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@ -3040,17 +3034,17 @@ private void scaleToImpl(ScalingFilter filter)(const Pixmap source, Pixmap targe
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const int[2] posSrcX = () {
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int[2] result;
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if (directions[idxX] == none) {
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static if (directionX == none) {
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result = [
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posSrc[idxX].castTo!int,
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posSrc[idxX].castTo!int,
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];
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} else if (directions[idxX] == up) {
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} else static if (directionX == up) {
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result = [
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min(sourceMaxX, posSrc[idxX].floor().castTo!int),
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min(sourceMaxX, posSrc[idxX].ceil().castTo!int),
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];
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} else /* if (directions[0] == down) */ {
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} else /* if (directionX == down) */ {
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const ratioXHalf = (ratios[idxX] >> 1);
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result = [
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max((posSrc[idxX] - ratioXHalf).roundEven().castTo!int, 0),
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@ -3062,17 +3056,17 @@ private void scaleToImpl(ScalingFilter filter)(const Pixmap source, Pixmap targe
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const int[2] posSrcY = () {
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int[2] result;
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if (directions[idxY] == none) {
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static if (directionY == none) {
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result = [
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posSrc[idxY].castTo!int,
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posSrc[idxY].castTo!int,
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];
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} else if (directions[idxY] == up) {
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} else static if (directionY == up) {
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result = [
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min(sourceMaxY, posSrc[idxY].floor().castTo!int),
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min(sourceMaxY, posSrc[idxY].ceil().castTo!int),
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];
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} else /* if (directions[idxY] == down) */ {
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} else /* if (directionY == down) */ {
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const ratioHalf = (ratios[idxY] >> 1);
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result = [
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max((posSrc[idxY] - ratioHalf).roundEven().castTo!int, 0),
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@ -3121,9 +3115,9 @@ private void scaleToImpl(ScalingFilter filter)(const Pixmap source, Pixmap targe
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ulong sampleX() {
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pragma(inline, true);
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if (directions[0] == none) {
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static if (directionX == none) {
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return (() @trusted => pxNeighs[idxTL].components.ptr[ib])();
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} else if (directions[0] == down) {
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} else static if (directionX == down) {
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const nSamples = 1 + posSrcX[idxR] - posSrcX[idxL];
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const posSampling = Point(posSrcX[idxL], posSrcY[idxT]);
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const samplingOffset = source.scanTo(posSampling);
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@ -3138,7 +3132,7 @@ private void scaleToImpl(ScalingFilter filter)(const Pixmap source, Pixmap targe
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}
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return (xSum / nSamples);
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} else /* if (directions[0] == up) */ {
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} else /* if (directionX == up) */ {
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ulong xSum = 0;
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const ulong[2] weightsX = () {
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@ -3160,7 +3154,7 @@ private void scaleToImpl(ScalingFilter filter)(const Pixmap source, Pixmap targe
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ulong[2] sampleXDual() {
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pragma(inline, true);
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if (directions[0] == none) {
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static if (directionX == none) {
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return () @trusted {
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ulong[2] result = [
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pxNeighs[idxTL].components.ptr[ib],
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@ -3168,7 +3162,7 @@ private void scaleToImpl(ScalingFilter filter)(const Pixmap source, Pixmap targe
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];
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return result;
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}();
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} else if (directions[0] == down) {
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} else static if (directionX == down) {
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const nSamples = 1 + posSrcX[idxR] - posSrcX[idxL];
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const Point[2] posSampling = [
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Point(posSrcX[idxL], posSrcY[idxT]),
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@ -3198,7 +3192,7 @@ private void scaleToImpl(ScalingFilter filter)(const Pixmap source, Pixmap targe
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xSums[] /= nSamples;
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return xSums;
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} else /* if (directions[0] == up) */ {
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} else /* if (directionX == up) */ {
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ulong[2] xSums = [0, 0];
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const ulong[2] weightsX = () {
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@ -3240,12 +3234,12 @@ private void scaleToImpl(ScalingFilter filter)(const Pixmap source, Pixmap targe
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return linesSum;
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}
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if (directions[0] == none) {
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static if (directionX == none) {
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ySum = foreachLine(delegate(const Point posLine) {
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const pxSrc = source.getPixel(posLine);
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return ulong((() @trusted => pxSrc.components.ptr[ib])());
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});
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} else if (directions[0] == down) {
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} else static if (directionX == down) {
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const nSamples = 1 + posSrcX[idxR] - posSrcX[idxL];
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ySum = foreachLine(delegate(const Point posLine) {
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@ -3264,7 +3258,7 @@ private void scaleToImpl(ScalingFilter filter)(const Pixmap source, Pixmap targe
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});
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ySum /= nSamples;
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} else /* if (directions[0] == up) */ {
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} else /* if (directionX == up) */ {
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const nSamples = 1 + posSrcX[idxR] - posSrcX[idxL];
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ySum = foreachLine(delegate(const Point posLine) {
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@ -3296,11 +3290,11 @@ private void scaleToImpl(ScalingFilter filter)(const Pixmap source, Pixmap targe
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return (ySum / nLines);
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}
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if (directions[idxY] == none) {
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static if (directionY == none) {
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c = clamp255(sampleX());
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} else if (directions[idxY] == down) {
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} else static if (directionY == down) {
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c = clamp255(sampleXMulti());
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} else /* if (directions[idxY] == up) */ {
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} else /* if (directionY == up) */ {
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// looks ass
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const ulong[2] weightsY = () {
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ulong[2] result;
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@ -3328,6 +3322,43 @@ private void scaleToImpl(ScalingFilter filter)(const Pixmap source, Pixmap targe
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++y;
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}
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}
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const Size delta = (target.size - source.size);
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const ScalingDirection[2] directions = [
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scalingDirectionFromDelta(delta.width),
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scalingDirectionFromDelta(delta.height),
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];
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if (directions[0] == none) {
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if (directions[1] == none) {
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version (none)
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scaleToLinearImpl!(none, none)();
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else
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return;
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} else if (directions[1] == up) {
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scaleToLinearImpl!(none, up)();
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} else /* if (directions[1] == down) */ {
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scaleToLinearImpl!(none, down)();
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}
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} else if (directions[0] == up) {
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if (directions[1] == none) {
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scaleToLinearImpl!(up, none)();
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} else if (directions[1] == up) {
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scaleToLinearImpl!(up, up)();
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} else /* if (directions[1] == down) */ {
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scaleToLinearImpl!(up, down)();
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}
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} else /* if (directions[0] == down) */ {
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if (directions[1] == none) {
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scaleToLinearImpl!(down, none)();
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} else if (directions[1] == up) {
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scaleToLinearImpl!(down, up)();
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} else /* if (directions[1] == down) */ {
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scaleToLinearImpl!(down, down)();
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}
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}
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}
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}
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// TODO: Document this function
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