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1x | /* Copyright 2017 Mozilla Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.PDFImage = undefined;
var _slicedToArray = function () { function sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"]) _i["return"](); } finally { if (_d) throw _e; } } return _arr; } return function (arr, i) { Eif (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return sliceIterator(arr, i); } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } }; }();
var _util = require('../shared/util');
var _primitives = require('./primitives');
var _colorspace = require('./colorspace');
var _stream = require('./stream');
var _jpeg_stream = require('./jpeg_stream');
var _jpx = require('./jpx');
var PDFImage = function PDFImageClosure() {
function handleImageData(image, nativeDecoder) {
Iif (nativeDecoder && nativeDecoder.canDecode(image)) {
return nativeDecoder.decode(image);
}
return Promise.resolve(image);
}
function decodeAndClamp(value, addend, coefficient, max) {
value = addend + value * coefficient;
return value < 0 ? 0 : value > max ? max : value;
}
function resizeImageMask(src, bpc, w1, h1, w2, h2) {
var length = w2 * h2;
var dest = bpc <= 8 ? new Uint8Array(length) : bpc <= 16 ? new Uint16Array(length) : new Uint32Array(length);
var xRatio = w1 / w2;
var yRatio = h1 / h2;
var i,
j,
py,
newIndex = 0,
oldIndex;
var xScaled = new Uint16Array(w2);
var w1Scanline = w1;
for (i = 0; i < w2; i++) {
xScaled[i] = Math.floor(i * xRatio);
}
for (i = 0; i < h2; i++) {
py = Math.floor(i * yRatio) * w1Scanline;
for (j = 0; j < w2; j++) {
oldIndex = py + xScaled[j];
dest[newIndex++] = src[oldIndex];
}
}
return dest;
}
function PDFImage(_ref) {
var xref = _ref.xref,
res = _ref.res,
image = _ref.image,
_ref$smask = _ref.smask,
smask = _ref$smask === undefined ? null : _ref$smask,
_ref$mask = _ref.mask,
mask = _ref$mask === undefined ? null : _ref$mask,
_ref$isMask = _ref.isMask,
isMask = _ref$isMask === undefined ? false : _ref$isMask,
pdfFunctionFactory = _ref.pdfFunctionFactory;
this.image = image;
var dict = image.dict;
Eif (dict.has('Filter')) {
var filter = dict.get('Filter').name;
Iif (filter === 'JPXDecode') {
var jpxImage = new _jpx.JpxImage();
jpxImage.parseImageProperties(image.stream);
image.stream.reset();
image.bitsPerComponent = jpxImage.bitsPerComponent;
image.numComps = jpxImage.componentsCount;
} else Iif (filter === 'JBIG2Decode') {
image.bitsPerComponent = 1;
image.numComps = 1;
}
}
this.width = dict.get('Width', 'W');
this.height = dict.get('Height', 'H');
Iif (this.width < 1 || this.height < 1) {
throw new _util.FormatError('Invalid image width: ' + this.width + ' or ' + ('height: ' + this.height));
}
this.interpolate = dict.get('Interpolate', 'I') || false;
this.imageMask = dict.get('ImageMask', 'IM') || false;
this.matte = dict.get('Matte') || false;
var bitsPerComponent = image.bitsPerComponent;
Eif (!bitsPerComponent) {
bitsPerComponent = dict.get('BitsPerComponent', 'BPC');
Iif (!bitsPerComponent) {
if (this.imageMask) {
bitsPerComponent = 1;
} else {
throw new _util.FormatError('Bits per component missing in image: ' + this.imageMask);
}
}
}
this.bpc = bitsPerComponent;
Eif (!this.imageMask) {
var colorSpace = dict.get('ColorSpace', 'CS');
Iif (!colorSpace) {
(0, _util.info)('JPX images (which do not require color spaces)');
switch (image.numComps) {
case 1:
colorSpace = _primitives.Name.get('DeviceGray');
break;
case 3:
colorSpace = _primitives.Name.get('DeviceRGB');
break;
case 4:
colorSpace = _primitives.Name.get('DeviceCMYK');
break;
default:
throw new Error('JPX images with ' + this.numComps + ' ' + 'color components not supported.');
}
}
this.colorSpace = _colorspace.ColorSpace.parse(colorSpace, xref, res, pdfFunctionFactory);
this.numComps = this.colorSpace.numComps;
}
this.decode = dict.getArray('Decode', 'D');
this.needsDecode = false;
Iif (this.decode && (this.colorSpace && !this.colorSpace.isDefaultDecode(this.decode) || isMask && !_colorspace.ColorSpace.isDefaultDecode(this.decode, 1))) {
this.needsDecode = true;
var max = (1 << bitsPerComponent) - 1;
this.decodeCoefficients = [];
this.decodeAddends = [];
for (var i = 0, j = 0; i < this.decode.length; i += 2, ++j) {
var dmin = this.decode[i];
var dmax = this.decode[i + 1];
this.decodeCoefficients[j] = dmax - dmin;
this.decodeAddends[j] = max * dmin;
}
}
Iif (smask) {
this.smask = new PDFImage({
xref: xref,
res: res,
image: smask,
pdfFunctionFactory: pdfFunctionFactory
});
} else Iif (mask) {
if ((0, _primitives.isStream)(mask)) {
var maskDict = mask.dict,
imageMask = maskDict.get('ImageMask', 'IM');
if (!imageMask) {
(0, _util.warn)('Ignoring /Mask in image without /ImageMask.');
} else {
this.mask = new PDFImage({
xref: xref,
res: res,
image: mask,
isMask: true,
pdfFunctionFactory: pdfFunctionFactory
});
}
} else {
this.mask = mask;
}
}
}
PDFImage.buildImage = function (_ref2) {
var handler = _ref2.handler,
xref = _ref2.xref,
res = _ref2.res,
image = _ref2.image,
_ref2$nativeDecoder = _ref2.nativeDecoder,
nativeDecoder = _ref2$nativeDecoder === undefined ? null : _ref2$nativeDecoder,
pdfFunctionFactory = _ref2.pdfFunctionFactory;
var imagePromise = handleImageData(image, nativeDecoder);
var smaskPromise;
var maskPromise;
var smask = image.dict.get('SMask');
var mask = image.dict.get('Mask');
Iif (smask) {
smaskPromise = handleImageData(smask, nativeDecoder);
maskPromise = Promise.resolve(null);
} else {
smaskPromise = Promise.resolve(null);
Iif (mask) {
if ((0, _primitives.isStream)(mask)) {
maskPromise = handleImageData(mask, nativeDecoder);
} else if (Array.isArray(mask)) {
maskPromise = Promise.resolve(mask);
} else {
(0, _util.warn)('Unsupported mask format.');
maskPromise = Promise.resolve(null);
}
} else {
maskPromise = Promise.resolve(null);
}
}
return Promise.all([imagePromise, smaskPromise, maskPromise]).then(function (_ref3) {
var _ref4 = _slicedToArray(_ref3, 3),
imageData = _ref4[0],
smaskData = _ref4[1],
maskData = _ref4[2];
return new PDFImage({
xref: xref,
res: res,
image: imageData,
smask: smaskData,
mask: maskData,
pdfFunctionFactory: pdfFunctionFactory
});
});
};
PDFImage.createMask = function (_ref5) {
var imgArray = _ref5.imgArray,
width = _ref5.width,
height = _ref5.height,
imageIsFromDecodeStream = _ref5.imageIsFromDecodeStream,
inverseDecode = _ref5.inverseDecode;
var computedLength = (width + 7 >> 3) * height;
var actualLength = imgArray.byteLength;
var haveFullData = computedLength === actualLength;
var data, i;
if (imageIsFromDecodeStream && (!inverseDecode || haveFullData)) {
data = imgArray;
} else if (!inverseDecode) {
data = new Uint8Array(actualLength);
data.set(imgArray);
} else {
data = new Uint8Array(computedLength);
data.set(imgArray);
for (i = actualLength; i < computedLength; i++) {
data[i] = 0xff;
}
}
if (inverseDecode) {
for (i = 0; i < actualLength; i++) {
data[i] ^= 0xFF;
}
}
return {
data: data,
width: width,
height: height
};
};
PDFImage.prototype = {
get drawWidth() {
return Math.max(this.width, 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 decodeBuffer(buffer) {
var bpc = this.bpc;
var numComps = this.numComps;
var decodeAddends = this.decodeAddends;
var decodeCoefficients = this.decodeCoefficients;
var max = (1 << bpc) - 1;
var i, ii;
if (bpc === 1) {
for (i = 0, ii = buffer.length; i < ii; i++) {
buffer[i] = +!buffer[i];
}
return;
}
var index = 0;
for (i = 0, ii = this.width * this.height; i < ii; i++) {
for (var j = 0; j < numComps; j++) {
buffer[index] = decodeAndClamp(buffer[index], decodeAddends[j], decodeCoefficients[j], max);
index++;
}
}
},
getComponents: function getComponents(buffer) {
var bpc = this.bpc;
if (bpc === 8) {
return buffer;
}
var width = this.width;
var height = this.height;
var numComps = this.numComps;
var length = width * height * numComps;
var bufferPos = 0;
var output = bpc <= 8 ? new Uint8Array(length) : bpc <= 16 ? new Uint16Array(length) : new Uint32Array(length);
var rowComps = width * numComps;
var max = (1 << bpc) - 1;
var i = 0,
ii,
buf;
if (bpc === 1) {
var mask, loop1End, loop2End;
for (var j = 0; j < height; j++) {
loop1End = i + (rowComps & ~7);
loop2End = i + rowComps;
while (i < loop1End) {
buf = buffer[bufferPos++];
output[i] = buf >> 7 & 1;
output[i + 1] = buf >> 6 & 1;
output[i + 2] = buf >> 5 & 1;
output[i + 3] = buf >> 4 & 1;
output[i + 4] = buf >> 3 & 1;
output[i + 5] = buf >> 2 & 1;
output[i + 6] = buf >> 1 & 1;
output[i + 7] = buf & 1;
i += 8;
}
if (i < loop2End) {
buf = buffer[bufferPos++];
mask = 128;
while (i < loop2End) {
output[i++] = +!!(buf & mask);
mask >>= 1;
}
}
}
} else {
var bits = 0;
buf = 0;
for (i = 0, ii = length; i < ii; ++i) {
if (i % rowComps === 0) {
buf = 0;
bits = 0;
}
while (bits < bpc) {
buf = buf << 8 | buffer[bufferPos++];
bits += 8;
}
var remainingBits = bits - bpc;
var value = buf >> remainingBits;
output[i] = value < 0 ? 0 : value > max ? max : value;
buf = buf & (1 << remainingBits) - 1;
bits = remainingBits;
}
}
return output;
},
fillOpacity: function fillOpacity(rgbaBuf, width, height, actualHeight, image) {
var smask = this.smask;
var mask = this.mask;
var alphaBuf, sw, sh, i, ii, j;
if (smask) {
sw = smask.width;
sh = smask.height;
alphaBuf = new Uint8Array(sw * sh);
smask.fillGrayBuffer(alphaBuf);
if (sw !== width || sh !== height) {
alphaBuf = resizeImageMask(alphaBuf, smask.bpc, sw, sh, width, height);
}
} else if (mask) {
if (mask instanceof PDFImage) {
sw = mask.width;
sh = mask.height;
alphaBuf = new Uint8Array(sw * sh);
mask.numComps = 1;
mask.fillGrayBuffer(alphaBuf);
for (i = 0, ii = sw * sh; i < ii; ++i) {
alphaBuf[i] = 255 - alphaBuf[i];
}
if (sw !== width || sh !== height) {
alphaBuf = resizeImageMask(alphaBuf, mask.bpc, sw, sh, width, height);
}
} else if (Array.isArray(mask)) {
alphaBuf = new Uint8Array(width * height);
var numComps = this.numComps;
for (i = 0, ii = width * height; i < ii; ++i) {
var opacity = 0;
var imageOffset = i * numComps;
for (j = 0; j < numComps; ++j) {
var color = image[imageOffset + j];
var maskOffset = j * 2;
if (color < mask[maskOffset] || color > mask[maskOffset + 1]) {
opacity = 255;
break;
}
}
alphaBuf[i] = opacity;
}
} else {
throw new _util.FormatError('Unknown mask format.');
}
}
if (alphaBuf) {
for (i = 0, j = 3, ii = width * actualHeight; i < ii; ++i, j += 4) {
rgbaBuf[j] = alphaBuf[i];
}
} else {
for (i = 0, j = 3, ii = width * actualHeight; i < ii; ++i, j += 4) {
rgbaBuf[j] = 255;
}
}
},
undoPreblend: function undoPreblend(buffer, width, height) {
var matte = this.smask && this.smask.matte;
if (!matte) {
return;
}
var matteRgb = this.colorSpace.getRgb(matte, 0);
var matteR = matteRgb[0];
var matteG = matteRgb[1];
var matteB = matteRgb[2];
var length = width * height * 4;
var r, g, b;
for (var i = 0; i < length; i += 4) {
var alpha = buffer[i + 3];
if (alpha === 0) {
buffer[i] = 255;
buffer[i + 1] = 255;
buffer[i + 2] = 255;
continue;
}
var k = 255 / alpha;
r = (buffer[i] - matteR) * k + matteR;
g = (buffer[i + 1] - matteG) * k + matteG;
b = (buffer[i + 2] - matteB) * k + matteB;
buffer[i] = r <= 0 ? 0 : r >= 255 ? 255 : r | 0;
buffer[i + 1] = g <= 0 ? 0 : g >= 255 ? 255 : g | 0;
buffer[i + 2] = b <= 0 ? 0 : b >= 255 ? 255 : b | 0;
}
},
createImageData: function createImageData() {
var forceRGBA = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
var drawWidth = this.drawWidth;
var drawHeight = this.drawHeight;
var imgData = {
width: drawWidth,
height: drawHeight
};
var numComps = this.numComps;
var originalWidth = this.width;
var originalHeight = this.height;
var bpc = this.bpc;
var rowBytes = originalWidth * numComps * bpc + 7 >> 3;
var imgArray;
Eif (!forceRGBA) {
var kind;
Iif (this.colorSpace.name === 'DeviceGray' && bpc === 1) {
kind = _util.ImageKind.GRAYSCALE_1BPP;
} else Eif (this.colorSpace.name === 'DeviceRGB' && bpc === 8 && !this.needsDecode) {
kind = _util.ImageKind.RGB_24BPP;
}
Eif (kind && !this.smask && !this.mask && drawWidth === originalWidth && drawHeight === originalHeight) {
imgData.kind = kind;
imgArray = this.getImageBytes(originalHeight * rowBytes);
Eif (this.image instanceof _stream.DecodeStream) {
imgData.data = imgArray;
} else {
var newArray = new Uint8Array(imgArray.length);
newArray.set(imgArray);
imgData.data = newArray;
}
Iif (this.needsDecode) {
(0, _util.assert)(kind === _util.ImageKind.GRAYSCALE_1BPP);
var buffer = imgData.data;
for (var i = 0, ii = buffer.length; i < ii; i++) {
buffer[i] ^= 0xff;
}
}
return imgData;
}
if (this.image instanceof _jpeg_stream.JpegStream && !this.smask && !this.mask && (this.colorSpace.name === 'DeviceGray' || this.colorSpace.name === 'DeviceRGB' || this.colorSpace.name === 'DeviceCMYK')) {
imgData.kind = _util.ImageKind.RGB_24BPP;
imgData.data = this.getImageBytes(originalHeight * rowBytes, drawWidth, drawHeight, true);
return imgData;
}
}
imgArray = this.getImageBytes(originalHeight * rowBytes);
var actualHeight = 0 | imgArray.length / rowBytes * drawHeight / originalHeight;
var comps = this.getComponents(imgArray);
var alpha01, maybeUndoPreblend;
if (!forceRGBA && !this.smask && !this.mask) {
imgData.kind = _util.ImageKind.RGB_24BPP;
imgData.data = new Uint8Array(drawWidth * drawHeight * 3);
alpha01 = 0;
maybeUndoPreblend = false;
} else {
imgData.kind = _util.ImageKind.RGBA_32BPP;
imgData.data = new Uint8Array(drawWidth * drawHeight * 4);
alpha01 = 1;
maybeUndoPreblend = true;
this.fillOpacity(imgData.data, drawWidth, drawHeight, actualHeight, comps);
}
if (this.needsDecode) {
this.decodeBuffer(comps);
}
this.colorSpace.fillRgb(imgData.data, originalWidth, originalHeight, drawWidth, drawHeight, actualHeight, bpc, comps, alpha01);
if (maybeUndoPreblend) {
this.undoPreblend(imgData.data, drawWidth, actualHeight);
}
return imgData;
},
fillGrayBuffer: function fillGrayBuffer(buffer) {
var numComps = this.numComps;
if (numComps !== 1) {
throw new _util.FormatError('Reading gray scale from a color image: ' + numComps);
}
var width = this.width;
var height = this.height;
var bpc = this.bpc;
var rowBytes = width * numComps * bpc + 7 >> 3;
var imgArray = this.getImageBytes(height * rowBytes);
var comps = this.getComponents(imgArray);
var i, length;
if (bpc === 1) {
length = width * height;
if (this.needsDecode) {
for (i = 0; i < length; ++i) {
buffer[i] = comps[i] - 1 & 255;
}
} else {
for (i = 0; i < length; ++i) {
buffer[i] = -comps[i] & 255;
}
}
return;
}
if (this.needsDecode) {
this.decodeBuffer(comps);
}
length = width * height;
var scale = 255 / ((1 << bpc) - 1);
for (i = 0; i < length; ++i) {
buffer[i] = scale * comps[i] | 0;
}
},
getImageBytes: function getImageBytes(length, drawWidth, drawHeight) {
var forceRGB = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : false;
this.image.reset();
this.image.drawWidth = drawWidth || this.width;
this.image.drawHeight = drawHeight || this.height;
this.image.forceRGB = !!forceRGB;
return this.image.getBytes(length);
}
};
return PDFImage;
}();
exports.PDFImage = PDFImage; |