92 lines
2.6 KiB
JavaScript
92 lines
2.6 KiB
JavaScript
function BBoxDevice(bbox) {
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function extend(x,y) {
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if (x < bbox[0]) bbox[0] = x;
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if (x > bbox[2]) bbox[2] = x;
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if (y < bbox[1]) bbox[1] = y;
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if (y > bbox[3]) bbox[3] = y;
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}
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function extendPoint(m, px, py) {
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var x = px * m[0] + py * m[2] + m[4];
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var y = px * m[1] + py * m[3] + m[5];
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extend(x, y);
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}
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function extendRect(m, r) {
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var x0 = r[0], y0 = r[1];
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var x1 = r[2], y1 = r[3];
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extendPoint(m, x0, y0);
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extendPoint(m, x1, y0);
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extendPoint(m, x0, y1);
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extendPoint(m, x1, y1);
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}
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function PathBounder(ctm) {
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return {
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moveTo: function (x,y) { extendPoint(ctm, x, y) },
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lineTo: function (x,y) { extendPoint(ctm, x, y) },
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curveTo: function (x1,y1,x2,y2,x3,y3) {
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extendPoint(ctm, x1, y1);
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extendPoint(ctm, x2, y2);
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extendPoint(ctm, x3, y3);
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},
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};
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}
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function TextBounder(ctm) {
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return {
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showGlyph: function (font,trm,gid,ucs,wmode,bidi) {
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var bbox = [ 0, -0.2, font.advanceGlyph(gid, 0), 0.8 ];
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extendRect(Concat(trm, ctm), bbox);
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},
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};
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}
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return {
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fillPath: function (path, evenOdd, ctm, colorSpace, color, alpha) {
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path.walk(new PathBounder(ctm));
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},
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clipPath: function (path, evenOdd, ctm) {
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path.walk(new PathBounder(ctm));
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},
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strokePath: function (path, stroke, ctm, colorSpace, color, alpha) {
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path.walk(new PathBounder(ctm));
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},
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clipStrokePath: function (path, stroke, ctm) {
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path.walk(new PathBounder(ctm));
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},
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fillText: function (text, ctm, colorSpace, color, alpha) {
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text.walk(new TextBounder(ctm));
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},
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clipText: function (text, ctm) {
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text.walk(new TextBounder(ctm));
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},
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strokeText: function (text, stroke, ctm, colorSpace, color, alpha) {
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text.walk(new TextBounder(ctm));
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},
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clipStrokeText: function (text, stroke, ctm) {
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text.walk(new TextBounder(ctm));
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},
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ignoreText: function (text, ctm) {
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text.walk(new TextBounder(ctm));
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},
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fillShade: function (shade, ctm, alpha) {
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var bbox = shade.bound(ctm);
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extend(bbox[0], bbox[1]);
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extend(bbox[2], bbox[3]);
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},
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fillImage: function (image, ctm, alpha) {
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extendRect(ctm, [0,0,1,1]);
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},
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fillImageMask: function (image, ctm, colorSpace, color, alpha) {
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extendRect(ctm, [0,0,1,1]);
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},
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};
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}
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if (scriptArgs.length != 2)
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print("usage: mutool run bbox-device.js document.pdf pageNumber")
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else {
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var doc = new Document(scriptArgs[0]);
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var page = doc.loadPage(parseInt(scriptArgs[1])-1);
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var bbox = [Infinity, Infinity, -Infinity, -Infinity];
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page.run(new BBoxDevice(bbox), Identity);
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print("original bbox:", page.bound());
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print("computed bbox:", bbox.map(function (x) { return Math.round(x); }));
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}
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