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Implement initial CalGray support 

Gamma and Whitepoint are supported in this patch for CalGray.
Blackpoint is not supported.
Kalervo Kujala 12 years ago
parent
b9bceb4c4b
commit
a5bf02573d
3 changed files with 675 additions and 2 deletions
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  1. 118
      src/shared/colorspace.js
  2. 553
      test/pdfs/calgray.pdf
  3. 6
      test/test_manifest.json

118
src/shared/colorspace.js
Unescape View File

@ -15,7 +15,7 @@ @@ -15,7 +15,7 @@
* limitations under the License.
*/
/* globals error, info, isArray, isDict, isName, isStream, isString,
PDFFunction, warn, shadow */
PDFFunction, warn, shadow, TODO */
'use strict';
@ -132,6 +132,11 @@ var ColorSpace = (function ColorSpaceClosure() { @@ -132,6 +132,11 @@ var ColorSpace = (function ColorSpaceClosure() {
return this.singletons.rgb;
case 'DeviceCmykCS':
return this.singletons.cmyk;
case 'CalGrayCS':
var whitePoint = IR[1].WhitePoint;
var blackPoint = IR[1].BlackPoint;
var gamma = IR[1].Gamma;
return new CalGrayCS(whitePoint, blackPoint, gamma);
case 'PatternCS':
var basePatternCS = IR[1];
if (basePatternCS)
@ -207,7 +212,8 @@ var ColorSpace = (function ColorSpaceClosure() { @@ -207,7 +212,8 @@ var ColorSpace = (function ColorSpaceClosure() {
case 'CMYK':
return 'DeviceCmykCS';
case 'CalGray':
return 'DeviceGrayCS';
var params = cs[1].getAll();
return ['CalGrayCS', params];
case 'CalRGB':
return 'DeviceRgbCS';
case 'ICCBased':
@ -627,6 +633,113 @@ var DeviceCmykCS = (function DeviceCmykCSClosure() { @@ -627,6 +633,113 @@ var DeviceCmykCS = (function DeviceCmykCSClosure() {
return DeviceCmykCS;
})();
//
// CalGrayCS: Based on "PDF Reference, Sixth Ed", p.245
//
var CalGrayCS = (function CalGrayCSClosure() {
function CalGrayCS(whitePoint, blackPoint, gamma) {
this.name = 'CalGray';
this.numComps = 3;
this.defaultColor = new Float32Array([0, 0, 0]);
if (!whitePoint) {
error('WhitePoint missing - required for color space CalGray');
}
blackPoint = blackPoint || [0, 0, 0];
gamma = gamma || 1;
// Translate arguments to spec variables.
this.XW = whitePoint[0];
this.YW = whitePoint[1];
this.ZW = whitePoint[2];
this.XB = blackPoint[0];
this.YB = blackPoint[1];
this.ZB = blackPoint[2];
this.G = gamma;
// Validate variables as per spec.
if (this.XW < 0 || this.ZW < 0 || this.YW !== 1) {
error('Invalid WhitePoint components for ' + this.name +
', no fallback available');
}
if (this.XB < 0 || this.YB < 0 || this.ZB < 0) {
info('Invalid BlackPoint for ' + this.name + ', falling back to default');
this.XB = this.YB = this.ZB = 0;
}
if (this.XB !== 0 || this.YB !== 0 || this.ZB !== 0) {
TODO(this.name + ', BlackPoint: XB: ' + this.XB + ', YB: ' + this.YB +
', ZB: ' + this.ZB + ', only default values are supported.');
}
if (this.G < 1) {
info('Invalid Gamma: ' + this.G + ' for ' + this.name +
', falling back to default');
this.G = 1;
}
}
CalGrayCS.prototype = {
getRgb: function CalGrayCS_getRgb(src, srcOffset) {
var rgb = new Uint8Array(3);
this.getRgbItem(src, srcOffset, rgb, 0);
return rgb;
},
getRgbItem: function CalGrayCS_getRgbItem(src, srcOffset,
dest, destOffset) {
// A represents a gray component of a calibrated gray space.
// A <---> AG in the spec
var A = src[srcOffset];
var AG = Math.pow(A, this.G);
// Computes intermediate variables M, L, N as per spec.
// Except if other than default BlackPoint values are used.
var M = this.XW * AG;
var L = this.YW * AG;
var N = this.ZW * AG;
// Decode XYZ, as per spec.
var X = M;
var Y = L;
var Z = N;
// http://www.poynton.com/notes/colour_and_gamma/ColorFAQ.html, Ch 4.
// This yields values in range [0, 100].
var Lstar = Math.max(116 * Math.pow(Y, 1 / 3) - 16, 0);
// Convert values to rgb range [0, 255].
dest[destOffset] = Lstar * 255 / 100;
dest[destOffset + 1] = Lstar * 255 / 100;
dest[destOffset + 2] = Lstar * 255 / 100;
},
getRgbBuffer: function CalGrayCS_getRgbBuffer(src, srcOffset, count,
dest, destOffset, bits) {
// TODO: This part is copied from DeviceGray. Make this utility function.
var scale = 255 / ((1 << bits) - 1);
var j = srcOffset, q = destOffset;
for (var i = 0; i < count; ++i) {
var c = (scale * src[j++]) | 0;
dest[q++] = c;
dest[q++] = c;
dest[q++] = c;
}
},
getOutputLength: function CalGrayCS_getOutputLength(inputLength) {
return inputLength * 3;
},
isPassthrough: ColorSpace.prototype.isPassthrough,
createRgbBuffer: ColorSpace.prototype.createRgbBuffer,
isDefaultDecode: function CalGrayCS_isDefaultDecode(decodeMap) {
return ColorSpace.isDefaultDecode(decodeMap, this.numComps);
},
usesZeroToOneRange: true
};
return CalGrayCS;
})();
//
// LabCS: Based on "PDF Reference, Sixth Ed", p.250
//
@ -767,3 +880,4 @@ var LabCS = (function LabCSClosure() { @@ -767,3 +880,4 @@ var LabCS = (function LabCSClosure() {
};
return LabCS;
})();

553
test/pdfs/calgray.pdf
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@ -0,0 +1,553 @@ @@ -0,0 +1,553 @@
%PDF-1.7
% filler %
% filler %
1 0 obj % entry point %
<< %
/Type /Catalog %
/Pages 2 0 R %
>> %
% filler %
endobj
2 0 obj %
<< /Type /Pages %
/MediaBox [ 0 0 850 1100 ] %
/Count 3 %
/Kids [ 3 0 R %
8 0 R %
12 0 R %
] %
>> %
% filler %
endobj
3 0 obj % Page object %
<< /Type /Page %
/Parent 2 0 R %
/Resources 4 0 R %
/Contents 7 0 R %
/CropBox [ 0 0 850 1100 ] %
>> %
% filler %
endobj
4 0 obj % Resource dictionary for page %
<< %
/ColorSpace << /Cs5 5 0 R >> %
/Font << /F1 6 0 R >> %
>> %
% filler %
endobj
5 0 obj % Colorspace definition %
[ /CalGray %
<< /WhitePoint [ 1.00000 1.0 1.00000 ] %
/BlackPoint [ 0.0 0.0 0.0 ] %
/Gamma 1.0 %
>> %
] %
% filler %
endobj
6 0 obj % Font definition %
<< /Type /Font %
/Subtype /Type1 %
/BaseFont /Times-Roman %
>> %
% filler %
endobj
7 0 obj % Contents of page %
<< /Length 3300 >>
stream
/Cs5 cs %
0.00 sc %
25 25 200 200 re%
f %
/Cs5 cs %
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225 25 200 200 re%
f %
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425 25 200 200 re%
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625 25 200 200 re%
f %
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25 225 200 200 re%
f %
/Cs5 cs %
0.20 sc %
225 225 200 200 re%
f %
/Cs5 cs %
0.25 sc %
425 225 200 200 re%
f %
/Cs5 cs %
0.30 sc %
625 225 200 200 re%
f %
/Cs5 cs %
0.35 sc %
25 425 200 200 re%
f %
/Cs5 cs %
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225 425 200 200 re%
f %
/Cs5 cs %
0.45 sc %
425 425 200 200 re%
f %
/Cs5 cs %
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625 425 200 200 re%
f %
/Cs5 cs %
0.55 sc %
25 625 200 200 re%
f %
/Cs5 cs %
0.60 sc %
225 625 200 200 re%
f %
/Cs5 cs %
0.65 sc %
425 625 200 200 re%
f %
/Cs5 cs %
0.70 sc %
625 625 200 200 re%
f %
/Cs5 cs %
0.75 sc %
25 825 200 200 re%
f %
/Cs5 cs %
0.80 sc %
225 825 200 200 re%
f %
/Cs5 cs %
0.90 sc %
425 825 200 200 re%
f %
/Cs5 cs %
1.00 sc %
625 825 200 200 re%
f %
BT %
/F1 16 Tf %
50 50 Td %
(A = 0.00) Tj %
200 0 Td %
(A = 0.01) Tj %
200 0 Td %
(A = 0.05) Tj %
200 0 Td %
(A = 0.10) Tj %
-600 200 Td %
(A = 0.15) Tj %
200 0 Td %
(A = 0.20) Tj %
200 0 Td %
(A = 0.25) Tj %
200 0 Td %
(A = 0.30) Tj %
-600 200 Td %
(A = 0.35) Tj %
200 0 Td %
(A = 0.40) Tj %
200 0 Td %
(A = 0.45) Tj %
200 0 Td %
(A = 0.50) Tj %
-600 200 Td %
(A = 0.55) Tj %
200 0 Td %
(A = 0.60) Tj %
200 0 Td %
(A = 0.65) Tj %
200 0 Td %
(A = 0.70) Tj %
-600 200 Td 0.0 g %
(A = 0.75) Tj %
200 0 Td %
(A = 0.80) Tj %
200 0 Td %
(A = 0.90) Tj %
200 0 Td %
(A = 1.00) Tj %
-600 200 Td %
(WhitePoint [ 1.0 1.0 1.0 ]) Tj %
200 0 Td %
(BlackPoint [ 0.0 0.0 0.0 ]) Tj %
200 0 Td %
(Gamma 1.0) Tj %
ET %
endstream
% %
endobj
8 0 obj % Page object %
<< /Type /Page %
/Parent 2 0 R %
/Resources 9 0 R %
/Contents 11 0 R %
/CropBox [ 0 0 850 1100 ] %
>> %
% filler %
endobj
9 0 obj % Resource dictionary for page %
<< %
/ColorSpace << /Cs10 10 0 R >> %
/Font << /F1 6 0 R >> %
>> %
% filler %
endobj
10 0 obj % Colorspace definition %
[ /CalGray %
<< /WhitePoint [ 1.00000 1.0 1.00000 ] %
/BlackPoint [ 0.0 0.0 0.0 ] %
/Gamma 5.0 %
>> %
] %
% filler %
endobj
11 0 obj % Contents of page %
<< /Length 3300 >>
stream
/Cs10 cs %
0.0 sc %
25 25 200 200 re%
f %
/Cs10 cs %
0.01 sc %
225 25 200 200 re%
f %
/Cs10 cs %
0.05 sc %
425 25 200 200 re%
f %
/Cs10 cs %
0.1 sc %
625 25 200 200 re%
f %
/Cs10 cs %
0.15 sc %
25 225 200 200 re%
f %
/Cs10 cs %
0.2 sc %
225 225 200 200 re%
f %
/Cs10 cs %
0.25 sc %
425 225 200 200 re%
f %
/Cs10 cs %
0.3 sc %
625 225 200 200 re%
f %
/Cs10 cs %
0.35 sc %
25 425 200 200 re%
f %
/Cs10 cs %
0.4 sc %
225 425 200 200 re%
f %
/Cs10 cs %
0.45 sc %
425 425 200 200 re%
f %
/Cs10 cs %
0.5 sc %
625 425 200 200 re%
f %
/Cs10 cs %
0.55 sc %
25 625 200 200 re%
f %
/Cs10 cs %
0.6 sc %
225 625 200 200 re%
f %
/Cs10 cs %
0.65 sc %
425 625 200 200 re%
f %
/Cs10 cs %
0.7 sc %
625 625 200 200 re%
f %
/Cs10 cs %
0.75 sc %
25 825 200 200 re%
f %
/Cs10 cs %
0.8 sc %
225 825 200 200 re%
f %
/Cs10 cs %
0.9 sc %
425 825 200 200 re%
f %
/Cs10 cs %
1.0 sc %
625 825 200 200 re%
f %
BT %
/F1 16 Tf %
50 50 Td %
(A = 0.00) Tj %
200 0 Td %
(A = 0.01) Tj %
200 0 Td %
(A = 0.05) Tj %
200 0 Td %
(A = 0.10) Tj %
-600 200 Td %
(A = 0.15) Tj %
200 0 Td %
(A = 0.20) Tj %
200 0 Td %
(A = 0.25) Tj %
200 0 Td %
(A = 0.30) Tj %
-600 200 Td %
(A = 0.35) Tj %
200 0 Td %
(A = 0.40) Tj %
200 0 Td %
(A = 0.45) Tj %
200 0 Td %
(A = 0.50) Tj %
-600 200 Td %
(A = 0.55) Tj %
200 0 Td %
(A = 0.60) Tj %
200 0 Td %
(A = 0.65) Tj %
200 0 Td %
(A = 0.70) Tj %
-600 200 Td 0.0 g %
(A = 0.75) Tj %
200 0 Td %
(A = 0.80) Tj %
200 0 Td %
(A = 0.90) Tj %
200 0 Td %
(A = 1.00) Tj %
-600 200 Td %
(WhitePoint [ 1.0 1.0 1.0 ]) Tj %
200 0 Td %
(BlackPoint [ 0.0 0.0 0.0 ]) Tj %
200 0 Td %
(Gamma 5.0) Tj %
ET %
endstream
% %
endobj
12 0 obj % Page object %
<< /Type /Page %
/Parent 2 0 R %
/Resources 13 0 R %
/Contents 15 0 R %
/CropBox [ 0 0 850 1100 ] %
>> %
% filler %
endobj
13 0 obj % Resource dictionary for page %
<< %
/ColorSpace << /Cs14 14 0 R >> %
/Font << /F1 6 0 R >> %
>> %
% filler %
endobj
14 0 obj % Colorspace definition %
[ /CalGray %
<< /WhitePoint [ 1.00000 1.0 1.00000 ] %
/BlackPoint [ 0.7 0.7 0.7 ] %
/Gamma 1.0 %
>> %
] %
% filler %
endobj
15 0 obj % Contents of page %
<< /Length 3300 >>
stream
/Cs14 cs %
0.0 sc %
25 25 200 200 re%
f %
/Cs14 cs %
0.01 sc %
225 25 200 200 re%
f %
/Cs14 cs %
0.05 sc %
425 25 200 200 re%
f %
/Cs14 cs %
0.1 sc %
625 25 200 200 re%
f %
/Cs14 cs %
0.15 sc %
25 225 200 200 re%
f %
/Cs14 cs %
0.2 sc %
225 225 200 200 re%
f %
/Cs14 cs %
0.25 sc %
425 225 200 200 re%
f %
/Cs14 cs %
0.3 sc %
625 225 200 200 re%
f %
/Cs14 cs %
0.35 sc %
25 425 200 200 re%
f %
/Cs14 cs %
0.4 sc %
225 425 200 200 re%
f %
/Cs14 cs %
0.45 sc %
425 425 200 200 re%
f %
/Cs14 cs %
0.5 sc %
625 425 200 200 re%
f %
/Cs14 cs %
0.55 sc %
25 625 200 200 re%
f %
/Cs14 cs %
0.6 sc %
225 625 200 200 re%
f %
/Cs14 cs %
0.65 sc %
425 625 200 200 re%
f %
/Cs14 cs %
0.7 sc %
625 625 200 200 re%
f %
/Cs14 cs %
0.75 sc %
25 825 200 200 re%
f %
/Cs14 cs %
0.8 sc %
225 825 200 200 re%
f %
/Cs14 cs %
0.9 sc %
425 825 200 200 re%
f %
/Cs14 cs %
1.0 sc %
625 825 200 200 re%
f %
BT %
/F1 16 Tf %
50 50 Td %
(A = 0.00) Tj %
200 0 Td %
(A = 0.01) Tj %
200 0 Td %
(A = 0.05) Tj %
200 0 Td %
(A = 0.10) Tj %
-600 200 Td %
(A = 0.15) Tj %
200 0 Td %
(A = 0.20) Tj %
200 0 Td %
(A = 0.25) Tj %
200 0 Td %
(A = 0.30) Tj %
-600 200 Td %
(A = 0.35) Tj %
200 0 Td %
(A = 0.40) Tj %
200 0 Td %
(A = 0.45) Tj %
200 0 Td %
(A = 0.50) Tj %
-600 200 Td %
(A = 0.55) Tj %
200 0 Td %
(A = 0.60) Tj %
200 0 Td %
(A = 0.65) Tj %
200 0 Td %
(A = 0.70) Tj %
-600 200 Td 0.0 g %
(A = 0.75) Tj %
200 0 Td %
(A = 0.80) Tj %
200 0 Td %
(A = 0.90) Tj %
200 0 Td %
(A = 1.00) Tj %
-600 200 Td %
(WhitePoint [ 1.0 1.0 1.0 ]) Tj %
200 0 Td %
(BlackPoint [ 0.7 0.7 0.7 ]) Tj %
200 0 Td %
(Gamma 1.0) Tj %
ET %
endstream
% %
endobj
xref
0 16
0000000000 65535 f
0000000100 00000 n
0000000400 00000 n
0000000900 00000 n
0000001300 00000 n
0000001600 00000 n
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0000002300 00000 n
0000005700 00000 n
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0000011300 00000 n
trailer
<<
/Size 16
/Root 1 0 R
>>
startxref
14700
%%EOF

6
test/test_manifest.json
Unescape View File

@ -1363,6 +1363,12 @@ @@ -1363,6 +1363,12 @@
"lastPage": 1,
"type": "eq"
},
{ "id": "calgray",
"file": "pdfs/calgray.pdf",
"md5": "ee784999bfa1ed373f55cdabbb580df1",
"rounds": 1,
"type": "eq"
},
{ "id": "issue2853",
"file": "pdfs/issue2853.pdf",
"md5": "9f0ad95ef0b243ee8813c4eca0f7a042",

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