reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame^] | 1 | /* libs/graphics/images/SkImageDecoder.cpp |
| 2 | ** |
| 3 | ** Copyright 2006, The Android Open Source Project |
| 4 | ** |
| 5 | ** Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | ** you may not use this file except in compliance with the License. |
| 7 | ** You may obtain a copy of the License at |
| 8 | ** |
| 9 | ** http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | ** |
| 11 | ** Unless required by applicable law or agreed to in writing, software |
| 12 | ** distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | ** See the License for the specific language governing permissions and |
| 15 | ** limitations under the License. |
| 16 | */ |
| 17 | |
| 18 | #include "SkImageDecoder.h" |
| 19 | #include "SkBitmap.h" |
| 20 | #include "SkPixelRef.h" |
| 21 | #include "SkStream.h" |
| 22 | #include "SkTemplates.h" |
| 23 | |
| 24 | static SkBitmap::Config gDeviceConfig = SkBitmap::kNo_Config; |
| 25 | |
| 26 | SkBitmap::Config SkImageDecoder::GetDeviceConfig() |
| 27 | { |
| 28 | return gDeviceConfig; |
| 29 | } |
| 30 | |
| 31 | void SkImageDecoder::SetDeviceConfig(SkBitmap::Config config) |
| 32 | { |
| 33 | gDeviceConfig = config; |
| 34 | } |
| 35 | |
| 36 | /////////////////////////////////////////////////////////////////////////////// |
| 37 | |
| 38 | SkImageDecoder::SkImageDecoder() |
| 39 | : fPeeker(NULL), fChooser(NULL), fAllocator(NULL), fSampleSize(1), |
| 40 | fDitherImage(true) { |
| 41 | } |
| 42 | |
| 43 | SkImageDecoder::~SkImageDecoder() { |
| 44 | fPeeker->safeUnref(); |
| 45 | fChooser->safeUnref(); |
| 46 | fAllocator->safeUnref(); |
| 47 | } |
| 48 | |
| 49 | SkImageDecoder::Format SkImageDecoder::getFormat() const { |
| 50 | return kUnknown_Format; |
| 51 | } |
| 52 | |
| 53 | SkImageDecoder::Peeker* SkImageDecoder::setPeeker(Peeker* peeker) { |
| 54 | SkRefCnt_SafeAssign(fPeeker, peeker); |
| 55 | return peeker; |
| 56 | } |
| 57 | |
| 58 | SkImageDecoder::Chooser* SkImageDecoder::setChooser(Chooser* chooser) { |
| 59 | SkRefCnt_SafeAssign(fChooser, chooser); |
| 60 | return chooser; |
| 61 | } |
| 62 | |
| 63 | SkBitmap::Allocator* SkImageDecoder::setAllocator(SkBitmap::Allocator* alloc) { |
| 64 | SkRefCnt_SafeAssign(fAllocator, alloc); |
| 65 | return alloc; |
| 66 | } |
| 67 | |
| 68 | void SkImageDecoder::setSampleSize(int size) { |
| 69 | if (size < 1) { |
| 70 | size = 1; |
| 71 | } |
| 72 | fSampleSize = size; |
| 73 | } |
| 74 | |
| 75 | bool SkImageDecoder::chooseFromOneChoice(SkBitmap::Config config, int width, |
| 76 | int height) const { |
| 77 | Chooser* chooser = fChooser; |
| 78 | |
| 79 | if (NULL == chooser) { // no chooser, we just say YES to decoding :) |
| 80 | return true; |
| 81 | } |
| 82 | chooser->begin(1); |
| 83 | chooser->inspect(0, config, width, height); |
| 84 | return chooser->choose() == 0; |
| 85 | } |
| 86 | |
| 87 | bool SkImageDecoder::allocPixelRef(SkBitmap* bitmap, |
| 88 | SkColorTable* ctable) const { |
| 89 | return bitmap->allocPixels(fAllocator, ctable); |
| 90 | } |
| 91 | |
| 92 | /////////////////////////////////////////////////////////////////////////////// |
| 93 | |
| 94 | bool SkImageDecoder::decode(SkStream* stream, SkBitmap* bm, |
| 95 | SkBitmap::Config pref, Mode mode) { |
| 96 | SkBitmap tmp; |
| 97 | |
| 98 | // we reset this to false before calling onDecode |
| 99 | fShouldCancelDecode = false; |
| 100 | |
| 101 | // pass a temporary bitmap, so that if we return false, we are assured of |
| 102 | // leaving the caller's bitmap untouched. |
| 103 | if (this->onDecode(stream, &tmp, pref, mode)) { |
| 104 | /* We operate on a tmp bitmap until we know we succeed. This way |
| 105 | we're sure we don't change the caller's bitmap and then later |
| 106 | return false. Returning false must mean that their parameter |
| 107 | is unchanged. |
| 108 | */ |
| 109 | bm->swap(tmp); |
| 110 | return true; |
| 111 | } |
| 112 | return false; |
| 113 | } |
| 114 | |
| 115 | /////////////////////////////////////////////////////////////////////////////// |
| 116 | |
| 117 | bool SkImageDecoder::DecodeFile(const char file[], SkBitmap* bm, |
| 118 | SkBitmap::Config pref, Mode mode) { |
| 119 | SkASSERT(file); |
| 120 | SkASSERT(bm); |
| 121 | |
| 122 | SkFILEStream stream(file); |
| 123 | if (stream.isValid()) { |
| 124 | if (SkImageDecoder::DecodeStream(&stream, bm, pref, mode)) { |
| 125 | bm->pixelRef()->setURI(file); |
| 126 | } |
| 127 | return true; |
| 128 | } |
| 129 | return false; |
| 130 | } |
| 131 | |
| 132 | bool SkImageDecoder::DecodeMemory(const void* buffer, size_t size, SkBitmap* bm, |
| 133 | SkBitmap::Config pref, Mode mode) { |
| 134 | if (0 == size) { |
| 135 | return false; |
| 136 | } |
| 137 | SkASSERT(buffer); |
| 138 | |
| 139 | SkMemoryStream stream(buffer, size); |
| 140 | return SkImageDecoder::DecodeStream(&stream, bm, pref, mode); |
| 141 | } |
| 142 | |
| 143 | bool SkImageDecoder::DecodeStream(SkStream* stream, SkBitmap* bm, |
| 144 | SkBitmap::Config pref, Mode mode) { |
| 145 | SkASSERT(stream); |
| 146 | SkASSERT(bm); |
| 147 | |
| 148 | bool success = false; |
| 149 | SkImageDecoder* codec = SkImageDecoder::Factory(stream); |
| 150 | |
| 151 | if (NULL != codec) { |
| 152 | success = codec->decode(stream, bm, pref, mode); |
| 153 | delete codec; |
| 154 | } |
| 155 | return success; |
| 156 | } |
| 157 | |
| 158 | /////////////////////////////////////////////////////////////////////////////// |
| 159 | |
| 160 | #ifdef SK_SUPPORT_IMAGE_ENCODE |
| 161 | |
| 162 | SkImageEncoder::~SkImageEncoder() {} |
| 163 | |
| 164 | bool SkImageEncoder::encodeStream(SkWStream* stream, const SkBitmap& bm, |
| 165 | int quality) { |
| 166 | quality = SkMin32(100, SkMax32(0, quality)); |
| 167 | return this->onEncode(stream, bm, quality); |
| 168 | } |
| 169 | |
| 170 | bool SkImageEncoder::encodeFile(const char file[], const SkBitmap& bm, |
| 171 | int quality) { |
| 172 | quality = SkMin32(100, SkMax32(0, quality)); |
| 173 | SkFILEWStream stream(file); |
| 174 | return this->onEncode(&stream, bm, quality); |
| 175 | } |
| 176 | |
| 177 | bool SkImageEncoder::EncodeFile(const char file[], const SkBitmap& bm, Type t, |
| 178 | int quality) { |
| 179 | SkAutoTDelete<SkImageEncoder> enc(SkImageEncoder::Create(t)); |
| 180 | return enc.get() && enc.get()->encodeFile(file, bm, quality); |
| 181 | } |
| 182 | |
| 183 | bool SkImageEncoder::EncodeStream(SkWStream* stream, const SkBitmap& bm, Type t, |
| 184 | int quality) { |
| 185 | SkAutoTDelete<SkImageEncoder> enc(SkImageEncoder::Create(t)); |
| 186 | return enc.get() && enc.get()->encodeStream(stream, bm, quality); |
| 187 | } |
| 188 | |
| 189 | #endif |
| 190 | |