1
2 /*
3 * Copyright 2010 The Android Open Source Project
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8
9
10 #include "SkPDFCatalog.h"
11 #include "SkPDFTypes.h"
12 #include "SkStream.h"
13 #include "SkTypes.h"
14
SkPDFCatalog(SkPDFDocument::Flags flags)15 SkPDFCatalog::SkPDFCatalog(SkPDFDocument::Flags flags)
16 : fFirstPageCount(0),
17 fNextObjNum(1),
18 fNextFirstPageObjNum(0),
19 fDocumentFlags(flags) {
20 }
21
~SkPDFCatalog()22 SkPDFCatalog::~SkPDFCatalog() {
23 fSubstituteResourcesRemaining.safeUnrefAll();
24 fSubstituteResourcesFirstPage.safeUnrefAll();
25 }
26
addObject(SkPDFObject * obj,bool onFirstPage)27 SkPDFObject* SkPDFCatalog::addObject(SkPDFObject* obj, bool onFirstPage) {
28 if (findObjectIndex(obj) != -1) { // object already added
29 return obj;
30 }
31 SkASSERT(fNextFirstPageObjNum == 0);
32 if (onFirstPage) {
33 fFirstPageCount++;
34 }
35
36 struct Rec newEntry(obj, onFirstPage);
37 fCatalog.append(1, &newEntry);
38 return obj;
39 }
40
setFileOffset(SkPDFObject * obj,off_t offset)41 size_t SkPDFCatalog::setFileOffset(SkPDFObject* obj, off_t offset) {
42 int objIndex = assignObjNum(obj) - 1;
43 SkASSERT(fCatalog[objIndex].fObjNumAssigned);
44 SkASSERT(fCatalog[objIndex].fFileOffset == 0);
45 fCatalog[objIndex].fFileOffset = offset;
46
47 return getSubstituteObject(obj)->getOutputSize(this, true);
48 }
49
emitObjectNumber(SkWStream * stream,SkPDFObject * obj)50 void SkPDFCatalog::emitObjectNumber(SkWStream* stream, SkPDFObject* obj) {
51 stream->writeDecAsText(assignObjNum(obj));
52 stream->writeText(" 0"); // Generation number is always 0.
53 }
54
getObjectNumberSize(SkPDFObject * obj)55 size_t SkPDFCatalog::getObjectNumberSize(SkPDFObject* obj) {
56 SkDynamicMemoryWStream buffer;
57 emitObjectNumber(&buffer, obj);
58 return buffer.getOffset();
59 }
60
findObjectIndex(SkPDFObject * obj) const61 int SkPDFCatalog::findObjectIndex(SkPDFObject* obj) const {
62 for (int i = 0; i < fCatalog.count(); i++) {
63 if (fCatalog[i].fObject == obj) {
64 return i;
65 }
66 }
67 // If it's not in the main array, check if it's a substitute object.
68 for (int i = 0; i < fSubstituteMap.count(); ++i) {
69 if (fSubstituteMap[i].fSubstitute == obj) {
70 return findObjectIndex(fSubstituteMap[i].fOriginal);
71 }
72 }
73 return -1;
74 }
75
assignObjNum(SkPDFObject * obj)76 int SkPDFCatalog::assignObjNum(SkPDFObject* obj) {
77 int pos = findObjectIndex(obj);
78 // If this assert fails, it means you probably forgot to add an object
79 // to the resource list.
80 SkASSERT(pos >= 0);
81 uint32_t currentIndex = pos;
82 if (fCatalog[currentIndex].fObjNumAssigned) {
83 return currentIndex + 1;
84 }
85
86 // First assignment.
87 if (fNextFirstPageObjNum == 0) {
88 fNextFirstPageObjNum = fCatalog.count() - fFirstPageCount + 1;
89 }
90
91 uint32_t objNum;
92 if (fCatalog[currentIndex].fOnFirstPage) {
93 objNum = fNextFirstPageObjNum;
94 fNextFirstPageObjNum++;
95 } else {
96 objNum = fNextObjNum;
97 fNextObjNum++;
98 }
99
100 // When we assign an object an object number, we put it in that array
101 // offset (minus 1 because object number 0 is reserved).
102 SkASSERT(!fCatalog[objNum - 1].fObjNumAssigned);
103 if (objNum - 1 != currentIndex) {
104 SkTSwap(fCatalog[objNum - 1], fCatalog[currentIndex]);
105 }
106 fCatalog[objNum - 1].fObjNumAssigned = true;
107 return objNum;
108 }
109
emitXrefTable(SkWStream * stream,bool firstPage)110 int32_t SkPDFCatalog::emitXrefTable(SkWStream* stream, bool firstPage) {
111 int first = -1;
112 int last = fCatalog.count() - 1;
113 // TODO(vandebo): Support linearized format.
114 // int last = fCatalog.count() - fFirstPageCount - 1;
115 // if (firstPage) {
116 // first = fCatalog.count() - fFirstPageCount;
117 // last = fCatalog.count() - 1;
118 // }
119
120 stream->writeText("xref\n");
121 stream->writeDecAsText(first + 1);
122 stream->writeText(" ");
123 stream->writeDecAsText(last - first + 1);
124 stream->writeText("\n");
125
126 if (first == -1) {
127 stream->writeText("0000000000 65535 f \n");
128 first++;
129 }
130 for (int i = first; i <= last; i++) {
131 SkASSERT(fCatalog[i].fFileOffset > 0);
132 SkASSERT(fCatalog[i].fFileOffset <= 9999999999LL);
133 stream->writeBigDecAsText(fCatalog[i].fFileOffset, 10);
134 stream->writeText(" 00000 n \n");
135 }
136
137 return fCatalog.count() + 1;
138 }
139
setSubstitute(SkPDFObject * original,SkPDFObject * substitute)140 void SkPDFCatalog::setSubstitute(SkPDFObject* original,
141 SkPDFObject* substitute) {
142 #if defined(SK_DEBUG)
143 // Sanity check: is the original already in substitute list?
144 for (int i = 0; i < fSubstituteMap.count(); ++i) {
145 if (original == fSubstituteMap[i].fSubstitute ||
146 original == fSubstituteMap[i].fOriginal) {
147 SkASSERT(false);
148 return;
149 }
150 }
151 #endif
152 // Check if the original is on first page.
153 bool onFirstPage = false;
154 for (int i = 0; i < fCatalog.count(); ++i) {
155 if (fCatalog[i].fObject == original) {
156 onFirstPage = fCatalog[i].fOnFirstPage;
157 break;
158 }
159 #if defined(SK_DEBUG)
160 if (i == fCatalog.count() - 1) {
161 SkASSERT(false); // original not in catalog
162 return;
163 }
164 #endif
165 }
166
167 SubstituteMapping newMapping(original, substitute);
168 fSubstituteMap.append(1, &newMapping);
169
170 // Add resource objects of substitute object to catalog.
171 SkTDArray<SkPDFObject*>* targetList = getSubstituteList(onFirstPage);
172 int existingSize = targetList->count();
173 newMapping.fSubstitute->getResources(targetList);
174 for (int i = existingSize; i < targetList->count(); ++i) {
175 addObject((*targetList)[i], onFirstPage);
176 }
177 }
178
getSubstituteObject(SkPDFObject * object)179 SkPDFObject* SkPDFCatalog::getSubstituteObject(SkPDFObject* object) {
180 for (int i = 0; i < fSubstituteMap.count(); ++i) {
181 if (object == fSubstituteMap[i].fOriginal) {
182 return fSubstituteMap[i].fSubstitute;
183 }
184 }
185 return object;
186 }
187
setSubstituteResourcesOffsets(off_t fileOffset,bool firstPage)188 off_t SkPDFCatalog::setSubstituteResourcesOffsets(off_t fileOffset,
189 bool firstPage) {
190 SkTDArray<SkPDFObject*>* targetList = getSubstituteList(firstPage);
191 off_t offsetSum = fileOffset;
192 for (int i = 0; i < targetList->count(); ++i) {
193 offsetSum += setFileOffset((*targetList)[i], offsetSum);
194 }
195 return offsetSum - fileOffset;
196 }
197
emitSubstituteResources(SkWStream * stream,bool firstPage)198 void SkPDFCatalog::emitSubstituteResources(SkWStream *stream, bool firstPage) {
199 SkTDArray<SkPDFObject*>* targetList = getSubstituteList(firstPage);
200 for (int i = 0; i < targetList->count(); ++i) {
201 (*targetList)[i]->emit(stream, this, true);
202 }
203 }
204
getSubstituteList(bool firstPage)205 SkTDArray<SkPDFObject*>* SkPDFCatalog::getSubstituteList(bool firstPage) {
206 return firstPage ? &fSubstituteResourcesFirstPage :
207 &fSubstituteResourcesRemaining;
208 }
209