Sakurai/pdf.js
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Playing with initial decode map impl.

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This commit is contained in:
Brendan Dahl 2011-12-13 08:48:27 -08:00
parent 3f8ba7d56a
commit d76f5f6815
2 changed files with 17 additions and 6 deletions
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2
src/evaluator.js
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@ -227,7 +227,7 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
data: new Uint8Array(w * h * 4) data: new Uint8Array(w * h * 4)
}; };
var pixels = imgData.data; var pixels = imgData.data;
imageObj.fillRgbaBuffer(pixels, imageObj.decode); imageObj.fillRgbaBuffer(pixels);
handler.send('obj', [objId, 'Image', imgData]); handler.send('obj', [objId, 'Image', imgData]);
}, handler, xref, resources, image, inline); }, handler, xref, resources, image, inline);
} }

21
src/image.js
View File

@ -104,10 +104,13 @@ var PDFImage = (function PDFImageClosure() {
}; };
PDFImage.prototype = { PDFImage.prototype = {
getComponents: function getComponents(buffer, decodeMap) { getComponents: function getComponents(buffer) {
var bpc = this.bpc; var bpc = this.bpc;
if (bpc == 8) var decodeMap = this.decode;
return buffer; //if (decodeMap)
// debugger;
//if (bpc == 8)
// return buffer;
var width = this.width; var width = this.width;
var height = this.height; var height = this.height;
@ -160,6 +163,14 @@ var PDFImage = (function PDFImageClosure() {
var remainingBits = bits - bpc; var remainingBits = bits - bpc;
output[i] = buf >> remainingBits; output[i] = buf >> remainingBits;
if (decodeMap) {
var x = output[i];
var dmin = decodeMap[0];
var dmax = decodeMap[1];
var max = Math.pow(2, bpc) - 1;
var val = max * (dmin + x * ((dmax - dmin)/(max)));
output[i] = val;
}
buf = buf & ((1 << remainingBits) - 1); buf = buf & ((1 << remainingBits) - 1);
bits = remainingBits; bits = remainingBits;
} }
@ -210,7 +221,7 @@ var PDFImage = (function PDFImageClosure() {
} }
} }
}, },
fillRgbaBuffer: function fillRgbaBuffer(buffer, decodeMap) { fillRgbaBuffer: function fillRgbaBuffer(buffer) {
var numComps = this.numComps; var numComps = this.numComps;
var width = this.width; var width = this.width;
var height = this.height; var height = this.height;
@ -221,7 +232,7 @@ var PDFImage = (function PDFImageClosure() {
var imgArray = this.getImageBytes(height * rowBytes); var imgArray = this.getImageBytes(height * rowBytes);
var comps = this.colorSpace.getRgbBuffer( var comps = this.colorSpace.getRgbBuffer(
this.getComponents(imgArray, decodeMap), bpc); this.getComponents(imgArray), bpc);
var compsPos = 0; var compsPos = 0;
var opacity = this.getOpacity(); var opacity = this.getOpacity();
var opacityPos = 0; var opacityPos = 0;