aboutsummaryrefslogtreecommitdiffhomepage
path: root/src/pdf/SkPDFTypes.h
blob: 6334938d77bfcfb9323b64aae04aff6bb3d1d242 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403

/*
 * Copyright 2010 The Android Open Source Project
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */


#ifndef SkPDFTypes_DEFINED
#define SkPDFTypes_DEFINED

#include "SkRefCnt.h"
#include "SkScalar.h"
#include "SkString.h"
#include "SkTDArray.h"
#include "SkTypes.h"

class SkPDFCatalog;
class SkWStream;

/** \class SkPDFObject

    A PDF Object is the base class for primitive elements in a PDF file.  A
    common subtype is used to ease the use of indirect object references,
    which are common in the PDF format.
*/
class SkPDFObject : public SkRefCnt {
public:
    /** Create a PDF object.
     */
    SkPDFObject();
    virtual ~SkPDFObject();

    /** Return the size (number of bytes) of this object in the final output
     *  file. Compound objects or objects that are computationally intensive
     *  to output should override this method.
     *  @param catalog  The object catalog to use.
     *  @param indirect If true, output an object identifier with the object.
     */
    virtual size_t getOutputSize(SkPDFCatalog* catalog, bool indirect);

    /** For non-primitive objects (i.e. objects defined outside this file),
     *  this method will add to resourceList any objects that this method
     *  depends on.  This operates recursively so if this object depends on
     *  another object and that object depends on two more, all three objects
     *  will be added.
     *  @param resourceList  The list to append dependant resources to.
     */
    virtual void getResources(SkTDArray<SkPDFObject*>* resourceList);

    /** Emit this object unless the catalog has a substitute object, in which
     *  case emit that.
     *  @see emitObject
     */
    void emit(SkWStream* stream, SkPDFCatalog* catalog, bool indirect);

    /** Helper function to output an indirect object.
     *  @param catalog The object catalog to use.
     *  @param stream  The writable output stream to send the output to.
     */
    void emitIndirectObject(SkWStream* stream, SkPDFCatalog* catalog);

    /** Helper function to find the size of an indirect object.
     *  @param catalog The object catalog to use.
     */
    size_t getIndirectOutputSize(SkPDFCatalog* catalog);

    /** Static helper function to add a resource to a list.  The list takes
     *  a reference.
     * @param resource  The resource to add.
     * @param list      The list to add the resource to.
     */
    static void AddResourceHelper(SkPDFObject* resource,
                                  SkTDArray<SkPDFObject*>* list);

    /** Static helper function to copy and reference the resources (and all
     *   their subresources) into a new list.
     * @param resources The resource list.
     * @param result    The list to add to.
     */
    static void GetResourcesHelper(SkTDArray<SkPDFObject*>* resources,
                                   SkTDArray<SkPDFObject*>* result);

protected:
    /** Subclasses must implement this method to print the object to the
     *  PDF file.
     *  @param catalog  The object catalog to use.
     *  @param indirect If true, output an object identifier with the object.
     *  @param stream   The writable output stream to send the output to.
     */
    virtual void emitObject(SkWStream* stream, SkPDFCatalog* catalog,
                            bool indirect) = 0;
};

/** \class SkPDFObjRef

    An indirect reference to a PDF object.
*/
class SkPDFObjRef : public SkPDFObject {
public:
    /** Create a reference to an existing SkPDFObject.
     *  @param obj The object to reference.
     */
    explicit SkPDFObjRef(SkPDFObject* obj);
    virtual ~SkPDFObjRef();

    // The SkPDFObject interface.
    virtual void emitObject(SkWStream* stream, SkPDFCatalog* catalog,
                            bool indirect);
    virtual size_t getOutputSize(SkPDFCatalog* catalog, bool indirect);

private:
    SkRefPtr<SkPDFObject> fObj;
};

/** \class SkPDFInt

    An integer object in a PDF.
*/
class SkPDFInt : public SkPDFObject {
public:
    /** Create a PDF integer (usually for indirect reference purposes).
     *  @param value An integer value between 2^31 - 1 and -2^31.
     */
    explicit SkPDFInt(int32_t value);
    virtual ~SkPDFInt();

    // The SkPDFObject interface.
    virtual void emitObject(SkWStream* stream, SkPDFCatalog* catalog,
                            bool indirect);

private:
    int32_t fValue;
};

/** \class SkPDFBool

    An boolean value in a PDF.
*/
class SkPDFBool : public SkPDFObject {
public:
    /** Create a PDF boolean.
     *  @param value true or false.
     */
    explicit SkPDFBool(bool value);
    virtual ~SkPDFBool();

    // The SkPDFObject interface.
    virtual void emitObject(SkWStream* stream, SkPDFCatalog* catalog,
                            bool indirect);
    virtual size_t getOutputSize(SkPDFCatalog* catalog, bool indirect);

private:
    bool fValue;
};

/** \class SkPDFScalar

    A real number object in a PDF.
*/
class SkPDFScalar : public SkPDFObject {
public:
    /** Create a PDF real number.
     *  @param value A real value.
     */
    explicit SkPDFScalar(SkScalar value);
    virtual ~SkPDFScalar();

    static void Append(SkScalar value, SkWStream* stream);

    // The SkPDFObject interface.
    virtual void emitObject(SkWStream* stream, SkPDFCatalog* catalog,
                            bool indirect);

private:
    SkScalar fValue;
};

/** \class SkPDFString

    A string object in a PDF.
*/
class SkPDFString : public SkPDFObject {
public:
    /** Create a PDF string. Maximum length (in bytes) is 65,535.
     *  @param value A string value.
     */
    explicit SkPDFString(const char value[]);
    explicit SkPDFString(const SkString& value);

    /** Create a PDF string. Maximum length (in bytes) is 65,535.
     *  @param value     A string value.
     *  @param len       The length of value.
     *  @param wideChars Indicates if the top byte in value is significant and
     *                   should be encoded (true) or not (false).
     */
    SkPDFString(const uint16_t* value, size_t len, bool wideChars);
    virtual ~SkPDFString();

    // The SkPDFObject interface.
    virtual void emitObject(SkWStream* stream, SkPDFCatalog* catalog,
                            bool indirect);
    virtual size_t getOutputSize(SkPDFCatalog* catalog, bool indirect);

    static SkString FormatString(const char* input, size_t len);
    static SkString FormatString(const uint16_t* input, size_t len,
                                 bool wideChars);
private:
    static const size_t kMaxLen = 65535;

    const SkString fValue;

    static SkString DoFormatString(const void* input, size_t len,
                                 bool wideInput, bool wideOutput);
};

/** \class SkPDFName

    A name object in a PDF.
*/
class SkPDFName : public SkPDFObject {
public:
    /** Create a PDF name object. Maximum length is 127 bytes.
     *  @param value The name.
     */
    explicit SkPDFName(const char name[]);
    explicit SkPDFName(const SkString& name);
    virtual ~SkPDFName();

    bool operator==(const SkPDFName& b) const;

    // The SkPDFObject interface.
    virtual void emitObject(SkWStream* stream, SkPDFCatalog* catalog,
                            bool indirect);
    virtual size_t getOutputSize(SkPDFCatalog* catalog, bool indirect);

private:
    static const size_t kMaxLen = 127;

    const SkString fValue;

    static SkString FormatName(const SkString& input);
};

/** \class SkPDFArray

    An array object in a PDF.
*/
class SkPDFArray : public SkPDFObject {
public:
    /** Create a PDF array. Maximum length is 8191.
     */
    SkPDFArray();
    virtual ~SkPDFArray();

    // The SkPDFObject interface.
    virtual void emitObject(SkWStream* stream, SkPDFCatalog* catalog,
                            bool indirect);
    virtual size_t getOutputSize(SkPDFCatalog* catalog, bool indirect);

    /** The size of the array.
     */
    int size() { return fValue.count(); }

    /** Preallocate space for the given number of entries.
     *  @param length The number of array slots to preallocate.
     */
    void reserve(int length);

    /** Returns the object at the given offset in the array.
     *  @param index The index into the array to retrieve.
     */
    SkPDFObject* getAt(int index) { return fValue[index]; }

    /** Set the object at the given offset in the array. Ref's value.
     *  @param index The index into the array to set.
     *  @param value The value to add to the array.
     *  @return The value argument is returned.
     */
    SkPDFObject* setAt(int index, SkPDFObject* value);

    /** Append the object to the end of the array and increments its ref count.
     *  @param value The value to add to the array.
     *  @return The value argument is returned.
     */
    SkPDFObject* append(SkPDFObject* value);

    /** Creates a SkPDFInt object and appends it to the array.
     *  @param value The value to add to the array.
     */
    void appendInt(int32_t value);

    /** Creates a SkPDFScalar object and appends it to the array.
     *  @param value The value to add to the array.
     */
    void appendScalar(SkScalar value);

    /** Creates a SkPDFName object and appends it to the array.
     *  @param value The value to add to the array.
     */
    void appendName(const char name[]);

private:
    static const int kMaxLen = 8191;
    SkTDArray<SkPDFObject*> fValue;
};

/** \class SkPDFDict

    A dictionary object in a PDF.
*/
class SkPDFDict : public SkPDFObject {
public:
    /** Create a PDF dictionary. Maximum number of entries is 4095.
     */
    SkPDFDict();

    /** Create a PDF dictionary with a Type entry.
     *  @param type   The value of the Type entry.
     */
    explicit SkPDFDict(const char type[]);

    virtual ~SkPDFDict();

    // The SkPDFObject interface.
    virtual void emitObject(SkWStream* stream, SkPDFCatalog* catalog,
                            bool indirect);
    virtual size_t getOutputSize(SkPDFCatalog* catalog, bool indirect);

    /** The size of the dictionary.
     */
    int size() { return fValue.count(); }

    /** Add the value to the dictionary with the given key.  Refs value.
     *  @param key   The key for this dictionary entry.
     *  @param value The value for this dictionary entry.
     *  @return The value argument is returned.
     */
    SkPDFObject* insert(SkPDFName* key, SkPDFObject* value);

    /** Add the value to the dictionary with the given key.  Refs value.  The
     *  method will create the SkPDFName object.
     *  @param key   The text of the key for this dictionary entry.
     *  @param value The value for this dictionary entry.
     *  @return The value argument is returned.
     */
    SkPDFObject* insert(const char key[], SkPDFObject* value);

    /** Add the int to the dictionary with the given key.
     *  @param key   The text of the key for this dictionary entry.
     *  @param value The int value for this dictionary entry.
     */
    void insertInt(const char key[], int32_t value);

    /** Add the scalar to the dictionary with the given key.
     *  @param key   The text of the key for this dictionary entry.
     *  @param value The scalar value for this dictionary entry.
     */
    void insertScalar(const char key[], SkScalar value);

    /** Add the name to the dictionary with the given key.
     *  @param key   The text of the key for this dictionary entry.
     *  @param name  The name for this dictionary entry.
     */
    void insertName(const char key[], const char name[]);

    /** Add the name to the dictionary with the given key.
     *  @param key   The text of the key for this dictionary entry.
     *  @param name  The name for this dictionary entry.
     */
    void insertName(const char key[], const SkString& name) {
        this->insertName(key, name.c_str());
    }

    /** Remove all entries from the dictionary.
     */
    void clear();

private:
    struct Rec {
      SkPDFName* key;
      SkPDFObject* value;
    };

public:
    class Iter {
    public:
        explicit Iter(const SkPDFDict& dict);
        SkPDFName* next(SkPDFObject** value);

    private:
        Rec* fIter;
        Rec* fStop;
    };

private:
    static const int kMaxLen = 4095;

    SkTDArray<struct Rec> fValue;
};

#endif