The Tor Browser: gfx/skia/trunk/src/images/SkImageDecoder

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /*

     2  * Copyright 2013 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  */

     8 #include "SkErrorInternals.h"

     9 #include "SkImageDecoder.h"

    10 #include "SkStream.h"

    11 #include "SkTRegistry.h"

    13 // This file is used for registration of SkImageDecoders. It also holds a function

    14 // for checking all the the registered SkImageDecoders for one that matches an

    15 // input SkStreamRewindable.

    17 template SkImageDecoder_DecodeReg* SkImageDecoder_DecodeReg::gHead;

    19 SkImageDecoder* image_decoder_from_stream(SkStreamRewindable*);

    21 SkImageDecoder* image_decoder_from_stream(SkStreamRewindable* stream) {

    22     SkImageDecoder* codec = NULL;

    23     const SkImageDecoder_DecodeReg* curr = SkImageDecoder_DecodeReg::Head();

    24     while (curr) {

    25         codec = curr->factory()(stream);

    26         // we rewind here, because we promise later when we call "decode", that

    27         // the stream will be at its beginning.

    28         bool rewindSuceeded = stream->rewind();

    30         // our image decoder's require that rewind is supported so we fail early

    31         // if we are given a stream that does not support rewinding.

    32         if (!rewindSuceeded) {

    33             SkDEBUGF(("Unable to rewind the image stream."));

    34             SkDELETE(codec);

    35             return NULL;

    36         }

    38         if (codec) {

    39             return codec;

    40         }

    41         curr = curr->next();

    42     }

    43     return NULL;

    44 }

    46 template SkImageDecoder_FormatReg* SkImageDecoder_FormatReg::gHead;

    48 SkImageDecoder::Format SkImageDecoder::GetStreamFormat(SkStreamRewindable* stream) {

    49     const SkImageDecoder_FormatReg* curr = SkImageDecoder_FormatReg::Head();

    50     while (curr != NULL) {

    51         Format format = curr->factory()(stream);

    52         if (!stream->rewind()) {

    53             SkErrorInternals::SetError(kInvalidOperation_SkError,

    54                                        "Unable to rewind the image stream\n");

    55             return kUnknown_Format;

    56         }

    57         if (format != kUnknown_Format) {

    58             return format;

    59         }

    60         curr = curr->next();

    61     }

    62     return kUnknown_Format;

    63 }

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