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1 /* | 1 /* |
2 * Copyright 2014 Google Inc. | 2 * Copyright 2014 Google Inc. |
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 #include "SkImageDecoder_astc.h" |
7 | 8 |
8 #include "SkEndian.h" | 9 #include "SkEndian.h" |
9 #include "SkColorPriv.h" | 10 #include "SkColorPriv.h" |
10 #include "SkImageDecoder.h" | |
11 #include "SkScaledBitmapSampler.h" | 11 #include "SkScaledBitmapSampler.h" |
12 #include "SkStream.h" | 12 #include "SkStream.h" |
13 #include "SkStreamPriv.h" | 13 #include "SkStreamPriv.h" |
14 #include "SkTypes.h" | 14 #include "SkTypes.h" |
15 | 15 |
16 #include "SkTextureCompressor.h" | 16 #include "SkTextureCompressor.h" |
17 | 17 |
18 class SkASTCImageDecoder : public SkImageDecoder { | 18 class SkASTCImageDecoder : public SkImageDecoder { |
19 public: | 19 public: |
20 SkASTCImageDecoder() { } | 20 SkASTCImageDecoder() { } |
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169 const uint8_t *srcRow = reinterpret_cast<uint8_t *>(outRGBADataPtr); | 169 const uint8_t *srcRow = reinterpret_cast<uint8_t *>(outRGBADataPtr); |
170 srcRow += sampler.srcY0() * srcRowBytes; | 170 srcRow += sampler.srcY0() * srcRowBytes; |
171 for (int y = 0; y < dstHeight; ++y) { | 171 for (int y = 0; y < dstHeight; ++y) { |
172 sampler.next(srcRow); | 172 sampler.next(srcRow); |
173 srcRow += sampler.srcDY() * srcRowBytes; | 173 srcRow += sampler.srcDY() * srcRowBytes; |
174 } | 174 } |
175 | 175 |
176 return true; | 176 return true; |
177 } | 177 } |
178 | 178 |
179 ////////////////////////////////////////////////////////////////////////////////
///////// | 179 SkImageDecoder::Format SkDetectFormatASTCImageDecoder(SkStreamRewindable* stream
) { |
180 DEFINE_DECODER_CREATOR(ASTCImageDecoder); | |
181 ////////////////////////////////////////////////////////////////////////////////
///////// | |
182 | |
183 static bool is_astc(SkStreamRewindable* stream) { | |
184 // Read the ASTC header and make sure it's valid. | 180 // Read the ASTC header and make sure it's valid. |
185 uint32_t magic; | 181 uint32_t magic; |
186 if (stream->read((void*)&magic, 4) != 4) { | 182 if (stream->read((void*)&magic, 4) == 4) { |
187 return false; | 183 if (kASTCMagicNumber == SkEndian_SwapLE32(magic)) |
| 184 return SkImageDecoder::kASTC_Format; |
188 } | 185 } |
189 | 186 return SkImageDecoder::kUnknown_Format; |
190 return kASTCMagicNumber == SkEndian_SwapLE32(magic); | |
191 } | 187 } |
192 | 188 |
193 static SkImageDecoder* sk_libastc_dfactory(SkStreamRewindable* stream) { | 189 SkImageDecoder* SkCreateASTCImageDecoder(SkStreamRewindable* stream) { |
194 if (is_astc(stream)) { | 190 if (SkDetectFormatASTCImageDecoder(stream) == SkImageDecoder::kASTC_Format)
{ |
195 return SkNEW(SkASTCImageDecoder); | 191 return SkNEW(SkASTCImageDecoder); |
196 } | 192 } |
197 return NULL; | 193 return NULL; |
198 } | 194 } |
199 | 195 |
200 static SkImageDecoder_DecodeReg gReg(sk_libastc_dfactory); | |
201 | |
202 static SkImageDecoder::Format get_format_astc(SkStreamRewindable* stream) { | |
203 if (is_astc(stream)) { | |
204 return SkImageDecoder::kASTC_Format; | |
205 } | |
206 return SkImageDecoder::kUnknown_Format; | |
207 } | |
208 | |
209 static SkImageDecoder_FormatReg gFormatReg(get_format_astc); | |
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