1/*
2 * Copyright 2006 The Android Open Source Project
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8
9#include "SkImageDecoder.h"
10#include "SkBitmap.h"
11#include "SkImagePriv.h"
12#include "SkPixelRef.h"
13#include "SkStream.h"
14#include "SkTemplates.h"
15#include "SkCanvas.h"
16
17SkImageDecoder::SkImageDecoder()
18    : fPeeker(nullptr)
19    , fAllocator(nullptr)
20    , fSampleSize(1)
21    , fDefaultPref(kUnknown_SkColorType)
22    , fPreserveSrcDepth(false)
23    , fDitherImage(true)
24    , fSkipWritingZeroes(false)
25    , fPreferQualityOverSpeed(false)
26    , fRequireUnpremultipliedColors(false) {
27}
28
29SkImageDecoder::~SkImageDecoder() {
30    SkSafeUnref(fPeeker);
31    SkSafeUnref(fAllocator);
32}
33
34void SkImageDecoder::copyFieldsToOther(SkImageDecoder* other) {
35    if (nullptr == other) {
36        return;
37    }
38    other->setPeeker(fPeeker);
39    other->setAllocator(fAllocator);
40    other->setSampleSize(fSampleSize);
41    other->setPreserveSrcDepth(fPreserveSrcDepth);
42    other->setDitherImage(fDitherImage);
43    other->setSkipWritingZeroes(fSkipWritingZeroes);
44    other->setPreferQualityOverSpeed(fPreferQualityOverSpeed);
45    other->setRequireUnpremultipliedColors(fRequireUnpremultipliedColors);
46}
47
48SkImageDecoder::Format SkImageDecoder::getFormat() const {
49    return kUnknown_Format;
50}
51
52const char* SkImageDecoder::getFormatName() const {
53    return GetFormatName(this->getFormat());
54}
55
56const char* SkImageDecoder::GetFormatName(Format format) {
57    switch (format) {
58        case kUnknown_Format:
59            return "Unknown Format";
60        case kBMP_Format:
61            return "BMP";
62        case kGIF_Format:
63            return "GIF";
64        case kICO_Format:
65            return "ICO";
66        case kPKM_Format:
67            return "PKM";
68        case kKTX_Format:
69            return "KTX";
70        case kASTC_Format:
71            return "ASTC";
72        case kJPEG_Format:
73            return "JPEG";
74        case kPNG_Format:
75            return "PNG";
76        case kWBMP_Format:
77            return "WBMP";
78        case kWEBP_Format:
79            return "WEBP";
80        default:
81            SkDEBUGFAIL("Invalid format type!");
82    }
83    return "Unknown Format";
84}
85
86SkPngChunkReader* SkImageDecoder::setPeeker(SkPngChunkReader* peeker) {
87    SkRefCnt_SafeAssign(fPeeker, peeker);
88    return peeker;
89}
90
91SkBitmap::Allocator* SkImageDecoder::setAllocator(SkBitmap::Allocator* alloc) {
92    SkRefCnt_SafeAssign(fAllocator, alloc);
93    return alloc;
94}
95
96void SkImageDecoder::setSampleSize(int size) {
97    if (size < 1) {
98        size = 1;
99    }
100    fSampleSize = size;
101}
102
103bool SkImageDecoder::allocPixelRef(SkBitmap* bitmap,
104                                   SkColorTable* ctable) const {
105    return bitmap->tryAllocPixels(fAllocator, ctable);
106}
107
108///////////////////////////////////////////////////////////////////////////////
109
110SkColorType SkImageDecoder::getPrefColorType(SrcDepth srcDepth, bool srcHasAlpha) const {
111    SkColorType ct = fDefaultPref;
112    if (fPreserveSrcDepth) {
113        switch (srcDepth) {
114            case kIndex_SrcDepth:
115                ct = kIndex_8_SkColorType;
116                break;
117            case k8BitGray_SrcDepth:
118                ct = kN32_SkColorType;
119                break;
120            case k32Bit_SrcDepth:
121                ct = kN32_SkColorType;
122                break;
123        }
124    }
125    return ct;
126}
127
128SkImageDecoder::Result SkImageDecoder::decode(SkStream* stream, SkBitmap* bm, SkColorType pref,
129                                              Mode mode) {
130    // we reset this to false before calling onDecode
131    fShouldCancelDecode = false;
132    // assign this, for use by getPrefColorType(), in case fUsePrefTable is false
133    fDefaultPref = pref;
134
135    // pass a temporary bitmap, so that if we return false, we are assured of
136    // leaving the caller's bitmap untouched.
137    SkBitmap tmp;
138    const Result result = this->onDecode(stream, &tmp, mode);
139    if (kFailure != result) {
140        bm->swap(tmp);
141    }
142    return result;
143}
144
145///////////////////////////////////////////////////////////////////////////////
146
147bool SkImageDecoder::DecodeFile(const char file[], SkBitmap* bm, SkColorType pref,  Mode mode,
148                                Format* format) {
149    SkASSERT(file);
150    SkASSERT(bm);
151
152    SkAutoTDelete<SkStreamRewindable> stream(SkStream::NewFromFile(file));
153    if (stream.get()) {
154        if (SkImageDecoder::DecodeStream(stream, bm, pref, mode, format)) {
155            if (SkPixelRef* pr = bm->pixelRef()) {
156                pr->setURI(file);
157            }
158            return true;
159        }
160    }
161    return false;
162}
163
164bool SkImageDecoder::DecodeMemory(const void* buffer, size_t size, SkBitmap* bm, SkColorType pref,
165                                  Mode mode, Format* format) {
166    if (0 == size) {
167        return false;
168    }
169    SkASSERT(buffer);
170
171    SkMemoryStream  stream(buffer, size);
172    return SkImageDecoder::DecodeStream(&stream, bm, pref, mode, format);
173}
174
175bool SkImageDecoder::DecodeStream(SkStreamRewindable* stream, SkBitmap* bm, SkColorType pref,
176                                  Mode mode, Format* format) {
177    SkASSERT(stream);
178    SkASSERT(bm);
179
180    bool success = false;
181    SkImageDecoder* codec = SkImageDecoder::Factory(stream);
182
183    if (codec) {
184        success = codec->decode(stream, bm, pref, mode) != kFailure;
185        if (success && format) {
186            *format = codec->getFormat();
187            if (kUnknown_Format == *format) {
188                if (stream->rewind()) {
189                    *format = GetStreamFormat(stream);
190                }
191            }
192        }
193        delete codec;
194    }
195    return success;
196}
197
198bool SkImageDecoder::decodeYUV8Planes(SkStream* stream, SkISize componentSizes[3], void* planes[3],
199                                      size_t rowBytes[3], SkYUVColorSpace* colorSpace) {
200    // we reset this to false before calling onDecodeYUV8Planes
201    fShouldCancelDecode = false;
202
203    return this->onDecodeYUV8Planes(stream, componentSizes, planes, rowBytes, colorSpace);
204}
205