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Add basic rescale support for smacks.

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This commit is contained in:
Brendan Dahl 2011-12-14 12:27:56 -08:00
parent 9d042ce166
commit 5ad3a9cc72
1 changed files with 30 additions and 5 deletions
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35
src/image.js
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@ -127,6 +127,31 @@ var PDFImage = (function PDFImageClosure() {
smaskPromise.resolve(null);
};
/**
* Resize an image using the nearest neighbor algorithm. Currently only
* supports one component images.
* @param {TypedArray} pixels The original image with one component.
* @param {Number} w1 Original width.
* @param {Number} h1 Original height.
* @param {Number} w2 New width.
* @param {Number} h2 New height.
* @return {TypedArray} Resized image data.
*/
PDFImage.resize = function resize(pixels, w1, h1, w2, h2) {
var temp = new Uint8Array(w2 * h2);
var xRatio = w1 / w2;
var yRatio = h1 / h2;
var px, py;
for (var i = 0; i < h2; i++) {
for (var j = 0; j < w2; j++) {
px = Math.floor(j * xRatio);
py = Math.floor(i * yRatio);
temp[(i * w2) + j] = pixels[((py * w1) + px)];
}
}
return temp;
};
PDFImage.prototype = {
getComponents: function getComponents(buffer) {
var bpc = this.bpc;
@ -221,18 +246,18 @@ var PDFImage = (function PDFImageClosure() {
var smask = this.smask;
var width = this.width;
var height = this.height;
var buf = new Uint8Array(width * height);
var buf;
if (smask) {
var sw = smask.width;
var sh = smask.height;
if (sw != this.width || sh != this.height)
error('smask dimensions do not match image dimensions: ' + sw +
' != ' + this.width + ', ' + sh + ' != ' + this.height);
buf = new Uint8Array(sw * sh)
smask.fillGrayBuffer(buf);
if (sw != this.width || sh != this.height)
buf = PDFImage.resize(buf, sw, sh, this.width, this.height);
return buf;
} else {
buf = new Uint8Array(width * height)
for (var i = 0, ii = width * height; i < ii; ++i)
buf[i] = 255;
}