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Code Activity

Refactor jpg.js and include forceRGBoutput, correct style of image.js

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This refactors getData to be more readable and extracts all the color
conversion algorithms to their own functions. The resulting code was then
cleaned up.
This also introduces a flag `forceRGBoutput` to getData, that allows to always
get the data as a `width * height * 3` bytes long RGB buffer
This commit is contained in:
Thorben Bochenek 2014-03-27 11:11:28 +01:00
parent 26bea20c82
commit e7fe45a5c4
2 changed files with 122 additions and 88 deletions
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15
src/core/image.js
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@ -44,6 +44,7 @@ var PDFImage = (function PDFImageClosure() {
return Promise.resolve(image);
}
}
/**
* Decode and clamp a value. The formula is different from the spec because we
* don't decode to float range [0,1], we decode it in the [0,max] range.
@ -53,6 +54,7 @@ var PDFImage = (function PDFImageClosure() {
// Clamp the value to the range
return (value < 0 ? 0 : (value > max ? max : value));
}
function PDFImage(xref, res, image, inline, smask, mask, isMask) {
this.image = image;
var dict = image.dict;
@ -279,11 +281,13 @@ var PDFImage = (function PDFImageClosure() {
this.smask && this.smask.width || 0,
this.mask && this.mask.width || 0);
},
get drawHeight() {
return Math.max(this.height,
this.smask && this.smask.height || 0,
this.mask && this.mask.height || 0);
},
decodeBuffer: function PDFImage_decodeBuffer(buffer) {
var bpc = this.bpc;
var numComps = this.numComps;
@ -309,6 +313,7 @@ var PDFImage = (function PDFImageClosure() {
}
}
},
getComponents: function PDFImage_getComponents(buffer) {
var bpc = this.bpc;
@ -385,6 +390,7 @@ var PDFImage = (function PDFImageClosure() {
}
return output;
},
fillOpacity: function PDFImage_fillOpacity(rgbaBuf, width, height,
actualHeight, image) {
var smask = this.smask;
@ -451,6 +457,7 @@ var PDFImage = (function PDFImageClosure() {
}
}
},
undoPreblend: function PDFImage_undoPreblend(buffer, width, height) {
var matte = this.smask && this.smask.matte;
if (!matte) {
@ -467,7 +474,7 @@ var PDFImage = (function PDFImageClosure() {
var alpha = buffer[i + 3];
if (alpha === 0) {
// according formula we have to get Infinity in all components
// making it as white (tipical paper color) should be okay
// making it white (tipical paper color) should be okay
buffer[i] = 255;
buffer[i + 1] = 255;
buffer[i + 2] = 255;
@ -479,6 +486,7 @@ var PDFImage = (function PDFImageClosure() {
buffer[i + 2] = clamp((buffer[i + 2] - matteRgb[2]) * k + matteRgb[2]);
}
},
createImageData: function PDFImage_createImageData(forceRGBA) {
var drawWidth = this.drawWidth;
var drawHeight = this.drawHeight;
@ -529,7 +537,6 @@ var PDFImage = (function PDFImageClosure() {
return imgData;
}
}
// imgArray can be incomplete (e.g. after CCITT fax encoding).
var actualHeight = 0 | (imgArray.length / rowBytes *
drawHeight / originalHeight);
@ -567,6 +574,7 @@ var PDFImage = (function PDFImageClosure() {
return imgData;
},
fillGrayBuffer: function PDFImage_fillGrayBuffer(buffer) {
var numComps = this.numComps;
if (numComps != 1) {
@ -589,7 +597,7 @@ var PDFImage = (function PDFImageClosure() {
length = width * height;
if (this.needsDecode) {
// invert and scale to {0, 255}
for (i = 0; i < length; ++i) {
for (var i = 0; i < length; ++i) {
buffer[i] = (comps[i] - 1) & 255;
}
} else {
@ -611,6 +619,7 @@ var PDFImage = (function PDFImageClosure() {
buffer[i] = (scale * comps[i]) | 0;
}
},
getImageBytes: function PDFImage_getImageBytes(length) {
this.image.reset();
return this.image.getBytes(length);