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1 /* | 1 /* |
2 * Copyright 2006 The Android Open Source Project | 2 * Copyright 2006 The Android Open Source Project |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #include "SkImageDecoder_libico.h" | |
9 | |
8 #include "SkColorPriv.h" | 10 #include "SkColorPriv.h" |
9 #include "SkImageDecoder.h" | 11 #include "SkImageDecoder.h" |
10 #include "SkStream.h" | 12 #include "SkStream.h" |
11 #include "SkStreamPriv.h" | 13 #include "SkStreamPriv.h" |
12 #include "SkTypes.h" | 14 #include "SkTypes.h" |
13 | 15 |
14 class SkICOImageDecoder : public SkImageDecoder { | 16 class SkICOImageDecoder : public SkImageDecoder { |
15 public: | 17 public: |
16 SkICOImageDecoder(); | 18 SkICOImageDecoder(); |
17 | 19 |
18 virtual Format getFormat() const SK_OVERRIDE { | 20 virtual Format getFormat() const SK_OVERRIDE { |
19 return kICO_Format; | 21 return kICO_Format; |
20 } | 22 } |
21 | 23 |
22 protected: | 24 protected: |
23 virtual bool onDecode(SkStream* stream, SkBitmap* bm, Mode) SK_OVERRIDE; | 25 virtual bool onDecode(SkStream* stream, SkBitmap* bm, Mode) SK_OVERRIDE; |
24 | 26 |
25 private: | 27 private: |
26 typedef SkImageDecoder INHERITED; | 28 typedef SkImageDecoder INHERITED; |
27 }; | 29 }; |
28 | |
scroggo
2014/11/12 18:00:12
Why the delete?
Kimmo Kinnunen
2014/11/18 08:29:45
Done.
| |
29 //////////////////////////////////////////////////////////////////////////////// ///////// | 30 //////////////////////////////////////////////////////////////////////////////// ///////// |
30 | 31 |
31 //read bytes starting from the begin-th index in the buffer | 32 //read bytes starting from the begin-th index in the buffer |
32 //read in Intel order, and return an integer | 33 //read in Intel order, and return an integer |
33 | 34 |
34 #define readByte(buffer,begin) buffer[begin] | 35 #define readByte(buffer,begin) buffer[begin] |
35 #define read2Bytes(buffer,begin) buffer[begin]+(buffer[begin+1]<<8) | 36 #define read2Bytes(buffer,begin) buffer[begin]+(buffer[begin+1]<<8) |
36 #define read4Bytes(buffer,begin) buffer[begin]+(buffer[begin+1]<<8)+(buffer[begi n+2]<<16)+(buffer[begin+3]<<24) | 37 #define read4Bytes(buffer,begin) buffer[begin]+(buffer[begin+1]<<8)+(buffer[begi n+2]<<16)+(buffer[begin+3]<<24) |
37 | 38 |
38 //////////////////////////////////////////////////////////////////////////////// ///////// | 39 //////////////////////////////////////////////////////////////////////////////// ///////// |
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382 int green = readByte(buf, xorOffset + 4*pixelNo + 1); | 383 int green = readByte(buf, xorOffset + 4*pixelNo + 1); |
383 int red = readByte(buf, xorOffset + 4*pixelNo + 2); | 384 int red = readByte(buf, xorOffset + 4*pixelNo + 2); |
384 int alphaBit = (alphaByte & m) >> shift; | 385 int alphaBit = (alphaByte & m) >> shift; |
385 #if 1 // don't trust the alphaBit for 32bit images <mrr> | 386 #if 1 // don't trust the alphaBit for 32bit images <mrr> |
386 alphaBit = 0; | 387 alphaBit = 0; |
387 #endif | 388 #endif |
388 int alpha = readByte(buf, xorOffset + 4*pixelNo + 3) & ((alphaBit-1)&0xFF); | 389 int alpha = readByte(buf, xorOffset + 4*pixelNo + 3) & ((alphaBit-1)&0xFF); |
389 *address = SkPreMultiplyARGB(alpha, red, green, blue); | 390 *address = SkPreMultiplyARGB(alpha, red, green, blue); |
390 } | 391 } |
391 | 392 |
392 /////////////////////////////////////////////////////////////////////////////// | 393 SkImageDecoder::Format SkDetectFormatICOImageDecoder(SkStreamRewindable* stream) { |
393 DEFINE_DECODER_CREATOR(ICOImageDecoder); | |
394 //////////////////////////////////////////////////////////////////////////////// ///////// | |
395 | |
396 static bool is_ico(SkStreamRewindable* stream) { | |
397 // Check to see if the first four bytes are 0,0,1,0 | 394 // Check to see if the first four bytes are 0,0,1,0 |
398 // FIXME: Is that required and sufficient? | 395 // FIXME: Is that required and sufficient? |
399 SkAutoMalloc autoMal(4); | 396 SkAutoMalloc autoMal(4); |
400 unsigned char* buf = (unsigned char*)autoMal.get(); | 397 unsigned char* buf = (unsigned char*)autoMal.get(); |
401 stream->read((void*)buf, 4); | 398 stream->read((void*)buf, 4); |
402 int reserved = read2Bytes(buf, 0); | 399 int reserved = read2Bytes(buf, 0); |
403 int type = read2Bytes(buf, 2); | 400 int type = read2Bytes(buf, 2); |
404 if (reserved != 0 || type != 1) { | 401 if (reserved != 0 || type != 1) { |
405 // This stream does not represent an ICO image. | 402 // This stream does not represent an ICO image. |
406 return false; | 403 return SkImageDecoder::kUnknown_Format; |
407 } | 404 } |
408 return true; | 405 return SkImageDecoder::kICO_Format; |
409 } | 406 } |
410 | 407 |
411 static SkImageDecoder* sk_libico_dfactory(SkStreamRewindable* stream) { | 408 SkImageDecoder* SkCreateICOImageDecoder(SkStreamRewindable* stream) { |
412 if (is_ico(stream)) { | 409 if (SkDetectFormatICOImageDecoder(stream) == SkImageDecoder::kICO_Format) { |
413 return SkNEW(SkICOImageDecoder); | 410 return SkNEW(SkICOImageDecoder); |
414 } | 411 } |
415 return NULL; | 412 return NULL; |
416 } | 413 } |
417 | 414 |
418 static SkImageDecoder_DecodeReg gReg(sk_libico_dfactory); | |
419 | |
420 static SkImageDecoder::Format get_format_ico(SkStreamRewindable* stream) { | |
421 if (is_ico(stream)) { | |
422 return SkImageDecoder::kICO_Format; | |
423 } | |
424 return SkImageDecoder::kUnknown_Format; | |
425 } | |
426 | |
427 static SkImageDecoder_FormatReg gFormatReg(get_format_ico); | |
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