Revert of Delete SkImageDecoder

src/images/SkImageDecoder.cpp

+/*
+ * Copyright 2006 The Android Open Source Project
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+
+#include "SkImageDecoder.h"
+#include "SkBitmap.h"
+#include "SkImagePriv.h"
+#include "SkPixelRef.h"
+#include "SkStream.h"
+#include "SkTemplates.h"
+#include "SkCanvas.h"
+
+SkImageDecoder::SkImageDecoder()
+    : fPeeker(nullptr)
+    , fAllocator(nullptr)
+    , fSampleSize(1)
+    , fDefaultPref(kUnknown_SkColorType)
+    , fPreserveSrcDepth(false)
+    , fDitherImage(true)
+    , fSkipWritingZeroes(false)
+    , fPreferQualityOverSpeed(false)
+    , fRequireUnpremultipliedColors(false) {
+}
+
+SkImageDecoder::~SkImageDecoder() {
+    SkSafeUnref(fPeeker);
+    SkSafeUnref(fAllocator);
+}
+
+void SkImageDecoder::copyFieldsToOther(SkImageDecoder* other) {
+    if (nullptr == other) {
+        return;
+    }
+    other->setPeeker(fPeeker);
+    other->setAllocator(fAllocator);
+    other->setSampleSize(fSampleSize);
+    other->setPreserveSrcDepth(fPreserveSrcDepth);
+    other->setDitherImage(fDitherImage);
+    other->setSkipWritingZeroes(fSkipWritingZeroes);
+    other->setPreferQualityOverSpeed(fPreferQualityOverSpeed);
+    other->setRequireUnpremultipliedColors(fRequireUnpremultipliedColors);
+}
+
+SkImageDecoder::Format SkImageDecoder::getFormat() const {
+    return kUnknown_Format;
+}
+
+const char* SkImageDecoder::getFormatName() const {
+    return GetFormatName(this->getFormat());
+}
+
+const char* SkImageDecoder::GetFormatName(Format format) {
+    switch (format) {
+        case kUnknown_Format:
+            return "Unknown Format";
+        case kBMP_Format:
+            return "BMP";
+        case kGIF_Format:
+            return "GIF";
+        case kICO_Format:
+            return "ICO";
+        case kPKM_Format:
+            return "PKM";
+        case kKTX_Format:
+            return "KTX";
+        case kASTC_Format:
+            return "ASTC";
+        case kJPEG_Format:
+            return "JPEG";
+        case kPNG_Format:
+            return "PNG";
+        case kWBMP_Format:
+            return "WBMP";
+        case kWEBP_Format:
+            return "WEBP";
+        default:
+            SkDEBUGFAIL("Invalid format type!");
+    }
+    return "Unknown Format";
+}
+
+SkPngChunkReader* SkImageDecoder::setPeeker(SkPngChunkReader* peeker) {
+    SkRefCnt_SafeAssign(fPeeker, peeker);
+    return peeker;
+}
+
+SkBitmap::Allocator* SkImageDecoder::setAllocator(SkBitmap::Allocator* alloc) {
+    SkRefCnt_SafeAssign(fAllocator, alloc);
+    return alloc;
+}
+
+void SkImageDecoder::setSampleSize(int size) {
+    if (size < 1) {
+        size = 1;
+    }
+    fSampleSize = size;
+}
+
+bool SkImageDecoder::allocPixelRef(SkBitmap* bitmap,
+                                   SkColorTable* ctable) const {
+    return bitmap->tryAllocPixels(fAllocator, ctable);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+SkColorType SkImageDecoder::getPrefColorType(SrcDepth srcDepth, bool srcHasAlpha) const {
+    SkColorType ct = fDefaultPref;
+    if (fPreserveSrcDepth) {
+        switch (srcDepth) {
+            case kIndex_SrcDepth:
+                ct = kIndex_8_SkColorType;
+                break;
+            case k8BitGray_SrcDepth:
+                ct = kN32_SkColorType;
+                break;
+            case k32Bit_SrcDepth:
+                ct = kN32_SkColorType;
+                break;
+        }
+    }
+    return ct;
+}
+
+SkImageDecoder::Result SkImageDecoder::decode(SkStream* stream, SkBitmap* bm, SkColorType pref,
+                                              Mode mode) {
+    // we reset this to false before calling onDecode
+    fShouldCancelDecode = false;
+    // assign this, for use by getPrefColorType(), in case fUsePrefTable is false
+    fDefaultPref = pref;
+
+    // pass a temporary bitmap, so that if we return false, we are assured of
+    // leaving the caller's bitmap untouched.
+    SkBitmap tmp;
+    const Result result = this->onDecode(stream, &tmp, mode);
+    if (kFailure != result) {
+        bm->swap(tmp);
+    }
+    return result;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+bool SkImageDecoder::DecodeFile(const char file[], SkBitmap* bm, SkColorType pref,  Mode mode,
+                                Format* format) {
+    SkASSERT(file);
+    SkASSERT(bm);
+
+    SkAutoTDelete<SkStreamRewindable> stream(SkStream::NewFromFile(file));
+    if (stream.get()) {
+        if (SkImageDecoder::DecodeStream(stream, bm, pref, mode, format)) {
+            if (SkPixelRef* pr = bm->pixelRef()) {
+                pr->setURI(file);
+            }
+            return true;
+        }
+    }
+    return false;
+}
+
+bool SkImageDecoder::DecodeMemory(const void* buffer, size_t size, SkBitmap* bm, SkColorType pref,
+                                  Mode mode, Format* format) {
+    if (0 == size) {
+        return false;
+    }
+    SkASSERT(buffer);
+
+    SkMemoryStream  stream(buffer, size);
+    return SkImageDecoder::DecodeStream(&stream, bm, pref, mode, format);
+}
+
+bool SkImageDecoder::DecodeStream(SkStreamRewindable* stream, SkBitmap* bm, SkColorType pref,
+                                  Mode mode, Format* format) {
+    SkASSERT(stream);
+    SkASSERT(bm);
+
+    bool success = false;
+    SkImageDecoder* codec = SkImageDecoder::Factory(stream);
+
+    if (codec) {
+        success = codec->decode(stream, bm, pref, mode) != kFailure;
+        if (success && format) {
+            *format = codec->getFormat();
+            if (kUnknown_Format == *format) {
+                if (stream->rewind()) {
+                    *format = GetStreamFormat(stream);
+                }
+            }
+        }
+        delete codec;
+    }
+    return success;
+}
+
+bool SkImageDecoder::decodeYUV8Planes(SkStream* stream, SkISize componentSizes[3], void* planes[3],
+                                      size_t rowBytes[3], SkYUVColorSpace* colorSpace) {
+    // we reset this to false before calling onDecodeYUV8Planes
+    fShouldCancelDecode = false;
+
+    return this->onDecodeYUV8Planes(stream, componentSizes, planes, rowBytes, colorSpace);
+}