87 lines
1.9 KiB
JavaScript
87 lines
1.9 KiB
JavaScript
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'use strict';
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// Adam 7
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// 0 1 2 3 4 5 6 7
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// 0 x 6 4 6 x 6 4 6
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// 1 7 7 7 7 7 7 7 7
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// 2 5 6 5 6 5 6 5 6
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// 3 7 7 7 7 7 7 7 7
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// 4 3 6 4 6 3 6 4 6
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// 5 7 7 7 7 7 7 7 7
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// 6 5 6 5 6 5 6 5 6
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// 7 7 7 7 7 7 7 7 7
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var imagePasses = [
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{ // pass 1 - 1px
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x: [0],
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y: [0]
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},
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{ // pass 2 - 1px
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x: [4],
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y: [0]
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},
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{ // pass 3 - 2px
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x: [0, 4],
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y: [4]
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},
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{ // pass 4 - 4px
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x: [2, 6],
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y: [0, 4]
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},
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{ // pass 5 - 8px
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x: [0, 2, 4, 6],
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y: [2, 6]
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},
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{ // pass 6 - 16px
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x: [1, 3, 5, 7],
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y: [0, 2, 4, 6]
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},
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{ // pass 7 - 32px
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x: [0, 1, 2, 3, 4, 5, 6, 7],
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y: [1, 3, 5, 7]
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}
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];
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exports.getImagePasses = function(width, height) {
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var images = [];
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var xLeftOver = width % 8;
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var yLeftOver = height % 8;
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var xRepeats = (width - xLeftOver) / 8;
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var yRepeats = (height - yLeftOver) / 8;
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for (var i = 0; i < imagePasses.length; i++) {
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var pass = imagePasses[i];
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var passWidth = xRepeats * pass.x.length;
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var passHeight = yRepeats * pass.y.length;
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for (var j = 0; j < pass.x.length; j++) {
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if (pass.x[j] < xLeftOver) {
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passWidth++;
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}
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else {
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break;
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}
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}
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for (j = 0; j < pass.y.length; j++) {
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if (pass.y[j] < yLeftOver) {
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passHeight++;
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}
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else {
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break;
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}
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}
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if (passWidth > 0 && passHeight > 0) {
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images.push({ width: passWidth, height: passHeight, index: i });
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}
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}
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return images;
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};
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exports.getInterlaceIterator = function(width) {
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return function(x, y, pass) {
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var outerXLeftOver = x % imagePasses[pass].x.length;
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var outerX = (((x - outerXLeftOver) / imagePasses[pass].x.length) * 8) + imagePasses[pass].x[outerXLeftOver];
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var outerYLeftOver = y % imagePasses[pass].y.length;
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var outerY = (((y - outerYLeftOver) / imagePasses[pass].y.length) * 8) + imagePasses[pass].y[outerYLeftOver];
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return (outerX * 4) + (outerY * width * 4);
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};
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};
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