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Second stage, smasks now working. Still needs optimization.

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This commit is contained in:
Brendan Dahl 2011-12-08 12:50:34 -08:00
parent 2a632d4ab2
commit 146cd8c861
4 changed files with 88 additions and 101 deletions
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50
src/image.js
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@ -4,8 +4,12 @@
'use strict';
var PDFImage = (function pdfImage() {
function constructor(xref, res, image, inline) {
function constructor(xref, res, image, inline, handler) {
this.image = image;
this.imageReady = true;
this.smaskReady = true;
this.callbacks = [];
if (image.getParams) {
// JPX/JPEG2000 streams directly contain bits per component
// and color space mode information.
@ -56,7 +60,24 @@ var PDFImage = (function pdfImage() {
if (mask) {
TODO('masked images');
} else if (smask) {
this.smask = new PDFImage(xref, res, smask);
this.smaskReady = false;
this.smask = new PDFImage(xref, res, smask, false, handler);
this.smask.ready(function() {
this.smaskReady = true;
if (this.isReady())
this.fireReady();
}.bind(this));
}
if (image instanceof JpegStream && image.isNative) {
this.imageReady = false;
handler.send('jpeg_decode', [image.getIR(), this.numComps], function(message) {
var data = message.data;
this.image = new Stream(data, 0, data.length);
this.imageReady = true;
if (this.isReady())
this.fireReady();
}.bind(this));
}
}
@ -130,18 +151,6 @@ var PDFImage = (function pdfImage() {
var buf = new Uint8Array(width * height);
if (smask) {
if (smask.image.getImage) {
// smask is a DOM image
var tempCanvas = new ScratchCanvas(width, height);
var tempCtx = tempCanvas.getContext('2d');
var domImage = smask.image.getImage();
tempCtx.drawImage(domImage, 0, 0, domImage.width, domImage.height,
0, 0, width, height);
var data = tempCtx.getImageData(0, 0, width, height).data;
for (var i = 0, j = 0, ii = width * height; i < ii; ++i, j += 4)
buf[i] = data[j]; // getting first component value
return buf;
}
var sw = smask.width;
var sh = smask.height;
if (sw != this.width || sh != this.height)
@ -224,6 +233,19 @@ var PDFImage = (function pdfImage() {
for (var i = 0; i < length; ++i)
buffer[i] = comps[i];
},
isReady: function isReady() {
return this.imageReady && this.smaskReady;
},
fireReady: function fireReady() {
for (var i = 0; i < this.callbacks.length; ++i) {
this.callbacks[i]();
this.callbacks = [];
},
ready: function ready(callback) {
this.callbacks.push(callback);
if (this.isReady())
this.fireReady();
}
};
return constructor;