summaryrefslogtreecommitdiffstats
path: root/image/encoders/ico/nsICOEncoder.cpp
blob: 5b26f5ca2eed5be3119eadc47e5d61bfd64654fb (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
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsCRT.h"
#include "mozilla/EndianUtils.h"
#include "nsBMPEncoder.h"
#include "nsPNGEncoder.h"
#include "nsICOEncoder.h"
#include "prprf.h"
#include "nsString.h"
#include "nsStreamUtils.h"
#include "nsTArray.h"

using namespace mozilla;
using namespace mozilla::image;

NS_IMPL_ISUPPORTS(nsICOEncoder, imgIEncoder, nsIInputStream,
                  nsIAsyncInputStream)

nsICOEncoder::nsICOEncoder() : mImageBufferStart(nullptr),
                               mImageBufferCurr(0),
                               mImageBufferSize(0),
                               mImageBufferReadPoint(0),
                               mFinished(false),
                               mUsePNG(true),
                               mNotifyThreshold(0)
{
}

nsICOEncoder::~nsICOEncoder()
{
  if (mImageBufferStart) {
    free(mImageBufferStart);
    mImageBufferStart = nullptr;
    mImageBufferCurr = nullptr;
  }
}

// nsICOEncoder::InitFromData
// Two output options are supported: format=<png|bmp>;bpp=<bpp_value>
// format specifies whether to use png or bitmap format
// bpp specifies the bits per pixel to use where bpp_value can be 24 or 32
NS_IMETHODIMP
nsICOEncoder::InitFromData(const uint8_t* aData,
                           uint32_t aLength,
                           uint32_t aWidth,
                           uint32_t aHeight,
                           uint32_t aStride,
                           uint32_t aInputFormat,
                           const nsAString& aOutputOptions)
{
  // validate input format
  if (aInputFormat != INPUT_FORMAT_RGB &&
      aInputFormat != INPUT_FORMAT_RGBA &&
      aInputFormat != INPUT_FORMAT_HOSTARGB) {
    return NS_ERROR_INVALID_ARG;
  }

  // Stride is the padded width of each row, so it better be longer
  if ((aInputFormat == INPUT_FORMAT_RGB &&
       aStride < aWidth * 3) ||
       ((aInputFormat == INPUT_FORMAT_RGBA ||
         aInputFormat == INPUT_FORMAT_HOSTARGB) &&
        aStride < aWidth * 4)) {
    NS_WARNING("Invalid stride for InitFromData");
    return NS_ERROR_INVALID_ARG;
  }

  nsresult rv;
  rv = StartImageEncode(aWidth, aHeight, aInputFormat, aOutputOptions);
  NS_ENSURE_SUCCESS(rv, rv);

  rv = AddImageFrame(aData, aLength, aWidth, aHeight, aStride,
                     aInputFormat, aOutputOptions);
  NS_ENSURE_SUCCESS(rv, rv);

  rv = EndImageEncode();
  return rv;
}

// Returns the number of bytes in the image buffer used
// For an ICO file, this is all bytes in the buffer.
NS_IMETHODIMP
nsICOEncoder::GetImageBufferUsed(uint32_t* aOutputSize)
{
  NS_ENSURE_ARG_POINTER(aOutputSize);
  *aOutputSize = mImageBufferSize;
  return NS_OK;
}

// Returns a pointer to the start of the image buffer
NS_IMETHODIMP
nsICOEncoder::GetImageBuffer(char** aOutputBuffer)
{
  NS_ENSURE_ARG_POINTER(aOutputBuffer);
  *aOutputBuffer = reinterpret_cast<char*>(mImageBufferStart);
  return NS_OK;
}

NS_IMETHODIMP
nsICOEncoder::AddImageFrame(const uint8_t* aData,
                            uint32_t aLength,
                            uint32_t aWidth,
                            uint32_t aHeight,
                            uint32_t aStride,
                            uint32_t aInputFormat,
                            const nsAString& aFrameOptions)
{
  if (mUsePNG) {

    mContainedEncoder = new nsPNGEncoder();
    nsresult rv;
    nsAutoString noParams;
    rv = mContainedEncoder->InitFromData(aData, aLength, aWidth, aHeight,
                                         aStride, aInputFormat, noParams);
    NS_ENSURE_SUCCESS(rv, rv);

    uint32_t PNGImageBufferSize;
    mContainedEncoder->GetImageBufferUsed(&PNGImageBufferSize);
    mImageBufferSize = ICONFILEHEADERSIZE + ICODIRENTRYSIZE +
                       PNGImageBufferSize;
    mImageBufferStart = static_cast<uint8_t*>(malloc(mImageBufferSize));
    if (!mImageBufferStart) {
      return NS_ERROR_OUT_OF_MEMORY;
    }
    mImageBufferCurr = mImageBufferStart;
    mICODirEntry.mBytesInRes = PNGImageBufferSize;

    EncodeFileHeader();
    EncodeInfoHeader();

    char* imageBuffer;
    rv = mContainedEncoder->GetImageBuffer(&imageBuffer);
    NS_ENSURE_SUCCESS(rv, rv);
    memcpy(mImageBufferCurr, imageBuffer, PNGImageBufferSize);
    mImageBufferCurr += PNGImageBufferSize;
  } else {
    mContainedEncoder = new nsBMPEncoder();
    nsresult rv;

    nsAutoString params;
    params.AppendLiteral("bpp=");
    params.AppendInt(mICODirEntry.mBitCount);

    rv = mContainedEncoder->InitFromData(aData, aLength, aWidth, aHeight,
                                         aStride, aInputFormat, params);
    NS_ENSURE_SUCCESS(rv, rv);

    uint32_t andMaskSize = ((GetRealWidth() + 31) / 32) * 4 * // row AND mask
                           GetRealHeight(); // num rows

    uint32_t BMPImageBufferSize;
    mContainedEncoder->GetImageBufferUsed(&BMPImageBufferSize);
    mImageBufferSize = ICONFILEHEADERSIZE + ICODIRENTRYSIZE +
                       BMPImageBufferSize + andMaskSize;
    mImageBufferStart = static_cast<uint8_t*>(malloc(mImageBufferSize));
    if (!mImageBufferStart) {
      return NS_ERROR_OUT_OF_MEMORY;
    }
    mImageBufferCurr = mImageBufferStart;

    // Icon files that wrap a BMP file must not include the BITMAPFILEHEADER
    // section at the beginning of the encoded BMP data, so we must skip over
    // bmp::FILE_HEADER_LENGTH bytes when adding the BMP content to the icon
    // file.
    mICODirEntry.mBytesInRes =
      BMPImageBufferSize - bmp::FILE_HEADER_LENGTH + andMaskSize;

    // Encode the icon headers
    EncodeFileHeader();
    EncodeInfoHeader();

    char* imageBuffer;
    rv = mContainedEncoder->GetImageBuffer(&imageBuffer);
    NS_ENSURE_SUCCESS(rv, rv);
    memcpy(mImageBufferCurr, imageBuffer + bmp::FILE_HEADER_LENGTH,
           BMPImageBufferSize - bmp::FILE_HEADER_LENGTH);
    // We need to fix the BMP height to be *2 for the AND mask
    uint32_t fixedHeight = GetRealHeight() * 2;
    NativeEndian::swapToLittleEndianInPlace(&fixedHeight, 1);
    // The height is stored at an offset of 8 from the DIB header
    memcpy(mImageBufferCurr + 8, &fixedHeight, sizeof(fixedHeight));
    mImageBufferCurr += BMPImageBufferSize - bmp::FILE_HEADER_LENGTH;

    // Calculate rowsize in DWORD's
    uint32_t rowSize = ((GetRealWidth() + 31) / 32) * 4; // + 31 to round up
    int32_t currentLine = GetRealHeight();

    // Write out the AND mask
    while (currentLine > 0) {
      currentLine--;
      uint8_t* encoded = mImageBufferCurr + currentLine * rowSize;
      uint8_t* encodedEnd = encoded + rowSize;
      while (encoded != encodedEnd) {
        *encoded = 0; // make everything visible
        encoded++;
      }
    }

    mImageBufferCurr += andMaskSize;
  }

  return NS_OK;
}

// See ::InitFromData for other info.
NS_IMETHODIMP
nsICOEncoder::StartImageEncode(uint32_t aWidth,
                               uint32_t aHeight,
                               uint32_t aInputFormat,
                               const nsAString& aOutputOptions)
{
  // can't initialize more than once
  if (mImageBufferStart || mImageBufferCurr) {
    return NS_ERROR_ALREADY_INITIALIZED;
  }

  // validate input format
  if (aInputFormat != INPUT_FORMAT_RGB &&
      aInputFormat != INPUT_FORMAT_RGBA &&
      aInputFormat != INPUT_FORMAT_HOSTARGB) {
    return NS_ERROR_INVALID_ARG;
  }

  // Icons are only 1 byte, so make sure our bitmap is in range
  if (aWidth > 256 || aHeight > 256) {
    return NS_ERROR_INVALID_ARG;
  }

  // parse and check any provided output options
  uint16_t bpp = 24;
  bool usePNG = true;
  nsresult rv = ParseOptions(aOutputOptions, bpp, usePNG);
  NS_ENSURE_SUCCESS(rv, rv);
  MOZ_ASSERT(bpp <= 32);

  mUsePNG = usePNG;

  InitFileHeader();
  // The width and height are stored as 0 when we have a value of 256
  InitInfoHeader(bpp, aWidth == 256 ? 0 : (uint8_t)aWidth,
                 aHeight == 256 ? 0 : (uint8_t)aHeight);

  return NS_OK;
}

NS_IMETHODIMP
nsICOEncoder::EndImageEncode()
{
  // must be initialized
  if (!mImageBufferStart || !mImageBufferCurr) {
    return NS_ERROR_NOT_INITIALIZED;
  }

  mFinished = true;
  NotifyListener();

  // if output callback can't get enough memory, it will free our buffer
  if (!mImageBufferStart || !mImageBufferCurr) {
    return NS_ERROR_OUT_OF_MEMORY;
  }

  return NS_OK;
}

// Parses the encoder options and sets the bits per pixel to use and PNG or BMP
// See InitFromData for a description of the parse options
nsresult
nsICOEncoder::ParseOptions(const nsAString& aOptions, uint16_t& aBppOut,
                           bool& aUsePNGOut)
{
  // If no parsing options just use the default of 24BPP and PNG yes
  if (aOptions.Length() == 0) {
    aUsePNGOut = true;
    aBppOut = 24;
  }

  // Parse the input string into a set of name/value pairs.
  // From format: format=<png|bmp>;bpp=<bpp_value>
  // to format: [0] = format=<png|bmp>, [1] = bpp=<bpp_value>
  nsTArray<nsCString> nameValuePairs;
  if (!ParseString(NS_ConvertUTF16toUTF8(aOptions), ';', nameValuePairs)) {
    return NS_ERROR_INVALID_ARG;
  }

  // For each name/value pair in the set
  for (unsigned i = 0; i < nameValuePairs.Length(); ++i) {

    // Split the name value pair [0] = name, [1] = value
    nsTArray<nsCString> nameValuePair;
    if (!ParseString(nameValuePairs[i], '=', nameValuePair)) {
      return NS_ERROR_INVALID_ARG;
    }
    if (nameValuePair.Length() != 2) {
      return NS_ERROR_INVALID_ARG;
    }

    // Parse the format portion of the string format=<png|bmp>;bpp=<bpp_value>
    if (nameValuePair[0].Equals("format",
                                nsCaseInsensitiveCStringComparator())) {
      if (nameValuePair[1].Equals("png",
                                  nsCaseInsensitiveCStringComparator())) {
        aUsePNGOut = true;
      }
      else if (nameValuePair[1].Equals("bmp",
                                       nsCaseInsensitiveCStringComparator())) {
        aUsePNGOut = false;
      }
      else {
        return NS_ERROR_INVALID_ARG;
      }
    }

    // Parse the bpp portion of the string format=<png|bmp>;bpp=<bpp_value>
    if (nameValuePair[0].Equals("bpp", nsCaseInsensitiveCStringComparator())) {
      if (nameValuePair[1].EqualsLiteral("24")) {
        aBppOut = 24;
      }
      else if (nameValuePair[1].EqualsLiteral("32")) {
        aBppOut = 32;
      }
      else {
        return NS_ERROR_INVALID_ARG;
      }
    }
  }

  return NS_OK;
}

NS_IMETHODIMP
nsICOEncoder::Close()
{
  if (mImageBufferStart) {
    free(mImageBufferStart);
    mImageBufferStart = nullptr;
    mImageBufferSize = 0;
    mImageBufferReadPoint = 0;
    mImageBufferCurr = nullptr;
  }

  return NS_OK;
}

// Obtains the available bytes to read
NS_IMETHODIMP
nsICOEncoder::Available(uint64_t *_retval)
{
  if (!mImageBufferStart || !mImageBufferCurr) {
    return NS_BASE_STREAM_CLOSED;
  }

  *_retval = GetCurrentImageBufferOffset() - mImageBufferReadPoint;
  return NS_OK;
}

// [noscript] Reads bytes which are available
NS_IMETHODIMP
nsICOEncoder::Read(char* aBuf, uint32_t aCount, uint32_t* _retval)
{
  return ReadSegments(NS_CopySegmentToBuffer, aBuf, aCount, _retval);
}

// [noscript] Reads segments
NS_IMETHODIMP
nsICOEncoder::ReadSegments(nsWriteSegmentFun aWriter, void* aClosure,
                           uint32_t aCount, uint32_t* _retval)
{
  uint32_t maxCount = GetCurrentImageBufferOffset() - mImageBufferReadPoint;
  if (maxCount == 0) {
    *_retval = 0;
    return mFinished ? NS_OK : NS_BASE_STREAM_WOULD_BLOCK;
  }

  if (aCount > maxCount) {
    aCount = maxCount;
  }

  nsresult rv = aWriter(this, aClosure,
                        reinterpret_cast<const char*>(mImageBufferStart +
                                                      mImageBufferReadPoint),
                        0, aCount, _retval);
  if (NS_SUCCEEDED(rv)) {
    NS_ASSERTION(*_retval <= aCount, "bad write count");
    mImageBufferReadPoint += *_retval;
  }
  // errors returned from the writer end here!
  return NS_OK;
}

NS_IMETHODIMP
nsICOEncoder::IsNonBlocking(bool* _retval)
{
  *_retval = true;
  return NS_OK;
}

NS_IMETHODIMP
nsICOEncoder::AsyncWait(nsIInputStreamCallback* aCallback,
                        uint32_t aFlags,
                        uint32_t aRequestedCount,
                        nsIEventTarget* aTarget)
{
  if (aFlags != 0) {
    return NS_ERROR_NOT_IMPLEMENTED;
  }

  if (mCallback || mCallbackTarget) {
    return NS_ERROR_UNEXPECTED;
  }

  mCallbackTarget = aTarget;
  // 0 means "any number of bytes except 0"
  mNotifyThreshold = aRequestedCount;
  if (!aRequestedCount) {
    mNotifyThreshold = 1024; // We don't want to notify incessantly
  }

  // We set the callback absolutely last, because NotifyListener uses it to
  // determine if someone needs to be notified.  If we don't set it last,
  // NotifyListener might try to fire off a notification to a null target
  // which will generally cause non-threadsafe objects to be used off the
  // main thread
  mCallback = aCallback;

  // What we are being asked for may be present already
  NotifyListener();
  return NS_OK;
}

NS_IMETHODIMP
nsICOEncoder::CloseWithStatus(nsresult aStatus)
{
  return Close();
}

void
nsICOEncoder::NotifyListener()
{
  if (mCallback &&
      (GetCurrentImageBufferOffset() -
         mImageBufferReadPoint >= mNotifyThreshold || mFinished)) {
    nsCOMPtr<nsIInputStreamCallback> callback;
    if (mCallbackTarget) {
      callback = NS_NewInputStreamReadyEvent(mCallback, mCallbackTarget);
    } else {
      callback = mCallback;
    }

    NS_ASSERTION(callback, "Shouldn't fail to make the callback");
    // Null the callback first because OnInputStreamReady could reenter
    // AsyncWait
    mCallback = nullptr;
    mCallbackTarget = nullptr;
    mNotifyThreshold = 0;

    callback->OnInputStreamReady(this);
  }
}

// Initializes the icon file header mICOFileHeader
void
nsICOEncoder::InitFileHeader()
{
  memset(&mICOFileHeader, 0, sizeof(mICOFileHeader));
  mICOFileHeader.mReserved = 0;
  mICOFileHeader.mType = 1;
  mICOFileHeader.mCount = 1;
}

// Initializes the icon directory info header mICODirEntry
void
nsICOEncoder::InitInfoHeader(uint16_t aBPP, uint8_t aWidth, uint8_t aHeight)
{
  memset(&mICODirEntry, 0, sizeof(mICODirEntry));
  mICODirEntry.mBitCount = aBPP;
  mICODirEntry.mBytesInRes = 0;
  mICODirEntry.mColorCount = 0;
  mICODirEntry.mWidth = aWidth;
  mICODirEntry.mHeight = aHeight;
  mICODirEntry.mImageOffset = ICONFILEHEADERSIZE + ICODIRENTRYSIZE;
  mICODirEntry.mPlanes = 1;
  mICODirEntry.mReserved = 0;
}

// Encodes the icon file header mICOFileHeader
void
nsICOEncoder::EncodeFileHeader()
{
  IconFileHeader littleEndianIFH = mICOFileHeader;
  NativeEndian::swapToLittleEndianInPlace(&littleEndianIFH.mReserved, 1);
  NativeEndian::swapToLittleEndianInPlace(&littleEndianIFH.mType, 1);
  NativeEndian::swapToLittleEndianInPlace(&littleEndianIFH.mCount, 1);

  memcpy(mImageBufferCurr, &littleEndianIFH.mReserved,
         sizeof(littleEndianIFH.mReserved));
  mImageBufferCurr += sizeof(littleEndianIFH.mReserved);
  memcpy(mImageBufferCurr, &littleEndianIFH.mType,
         sizeof(littleEndianIFH.mType));
  mImageBufferCurr += sizeof(littleEndianIFH.mType);
  memcpy(mImageBufferCurr, &littleEndianIFH.mCount,
         sizeof(littleEndianIFH.mCount));
  mImageBufferCurr += sizeof(littleEndianIFH.mCount);
}

// Encodes the icon directory info header mICODirEntry
void
nsICOEncoder::EncodeInfoHeader()
{
  IconDirEntry littleEndianmIDE = mICODirEntry;

  NativeEndian::swapToLittleEndianInPlace(&littleEndianmIDE.mPlanes, 1);
  NativeEndian::swapToLittleEndianInPlace(&littleEndianmIDE.mBitCount, 1);
  NativeEndian::swapToLittleEndianInPlace(&littleEndianmIDE.mBytesInRes, 1);
  NativeEndian::swapToLittleEndianInPlace(&littleEndianmIDE.mImageOffset, 1);

  memcpy(mImageBufferCurr, &littleEndianmIDE.mWidth,
         sizeof(littleEndianmIDE.mWidth));
  mImageBufferCurr += sizeof(littleEndianmIDE.mWidth);
  memcpy(mImageBufferCurr, &littleEndianmIDE.mHeight,
         sizeof(littleEndianmIDE.mHeight));
  mImageBufferCurr += sizeof(littleEndianmIDE.mHeight);
  memcpy(mImageBufferCurr, &littleEndianmIDE.mColorCount,
         sizeof(littleEndianmIDE.mColorCount));
  mImageBufferCurr += sizeof(littleEndianmIDE.mColorCount);
  memcpy(mImageBufferCurr, &littleEndianmIDE.mReserved,
         sizeof(littleEndianmIDE.mReserved));
  mImageBufferCurr += sizeof(littleEndianmIDE.mReserved);
  memcpy(mImageBufferCurr, &littleEndianmIDE.mPlanes,
         sizeof(littleEndianmIDE.mPlanes));
  mImageBufferCurr += sizeof(littleEndianmIDE.mPlanes);
  memcpy(mImageBufferCurr, &littleEndianmIDE.mBitCount,
         sizeof(littleEndianmIDE.mBitCount));
  mImageBufferCurr += sizeof(littleEndianmIDE.mBitCount);
  memcpy(mImageBufferCurr, &littleEndianmIDE.mBytesInRes,
         sizeof(littleEndianmIDE.mBytesInRes));
  mImageBufferCurr += sizeof(littleEndianmIDE.mBytesInRes);
  memcpy(mImageBufferCurr, &littleEndianmIDE.mImageOffset,
         sizeof(littleEndianmIDE.mImageOffset));
  mImageBufferCurr += sizeof(littleEndianmIDE.mImageOffset);
}