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Add ability to fast track natively supported jpegs.

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This commit is contained in:
Brendan Dahl 2011-12-08 21:18:04 -08:00
parent d1c823efce
commit 7d1cddf371
5 changed files with 59 additions and 23 deletions
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24
src/image.js
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@ -151,6 +151,8 @@ var PDFImage = (function pdfImage() {
var buf = new Uint8Array(width * height);
if (smask) {
if (!smask.isReady())
error('Soft mask is not ready.');
var sw = smask.width;
var sh = smask.height;
if (sw != this.width || sh != this.height)
@ -168,8 +170,7 @@ var PDFImage = (function pdfImage() {
applyStencilMask: function applyStencilMask(buffer, inverseDecode) {
var width = this.width, height = this.height;
var bitStrideLength = (width + 7) >> 3;
this.image.reset();
var imgArray = this.image.getBytes(bitStrideLength * height);
var imgArray = this.getImageBytes(bitStrideLength * height);
var imgArrayPos = 0;
var i, j, mask, buf;
// removing making non-masked pixels transparent
@ -197,8 +198,7 @@ var PDFImage = (function pdfImage() {
// rows start at byte boundary;
var rowBytes = (width * numComps * bpc + 7) >> 3;
this.image.reset();
var imgArray = this.image.getBytes(height * rowBytes);
var imgArray = this.getImageBytes(height * rowBytes);
var comps = this.colorSpace.getRgbBuffer(
this.getComponents(imgArray, decodeMap), bpc);
@ -225,8 +225,7 @@ var PDFImage = (function pdfImage() {
// rows start at byte boundary;
var rowBytes = (width * numComps * bpc + 7) >> 3;
this.image.reset();
var imgArray = this.image.getBytes(height * rowBytes);
var imgArray = this.getImageBytes(height * rowBytes);
var comps = this.getComponents(imgArray);
var length = width * height;
@ -234,6 +233,12 @@ var PDFImage = (function pdfImage() {
for (var i = 0; i < length; ++i)
buffer[i] = comps[i];
},
getImageBytes: function getImageBytes(length) {
if (!this.isReady())
error('Image is not ready to be read.');
this.image.reset();
return this.image.getBytes(length);
},
isReady: function isReady() {
return this.imageReady && this.smaskReady;
},
@ -250,3 +255,10 @@ var PDFImage = (function pdfImage() {
};
return constructor;
})();
function loadJpegStream(id, imageData, objs) {
var img = new Image();
img.onload = (function jpegImageLoaderOnload() {
objs.resolve(id, img);
});
img.src = 'data:image/jpeg;base64,' + window.btoa(imageData);
}