DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (d8847129d134)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63
/*
 * Copyright 2013 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 "SkErrorInternals.h"
#include "SkImageDecoder.h"
#include "SkStream.h"
#include "SkTRegistry.h"

// This file is used for registration of SkImageDecoders. It also holds a function
// for checking all the the registered SkImageDecoders for one that matches an
// input SkStreamRewindable.

template SkImageDecoder_DecodeReg* SkImageDecoder_DecodeReg::gHead;

SkImageDecoder* image_decoder_from_stream(SkStreamRewindable*);

SkImageDecoder* image_decoder_from_stream(SkStreamRewindable* stream) {
    SkImageDecoder* codec = NULL;
    const SkImageDecoder_DecodeReg* curr = SkImageDecoder_DecodeReg::Head();
    while (curr) {
        codec = curr->factory()(stream);
        // we rewind here, because we promise later when we call "decode", that
        // the stream will be at its beginning.
        bool rewindSuceeded = stream->rewind();

        // our image decoder's require that rewind is supported so we fail early
        // if we are given a stream that does not support rewinding.
        if (!rewindSuceeded) {
            SkDEBUGF(("Unable to rewind the image stream."));
            SkDELETE(codec);
            return NULL;
        }

        if (codec) {
            return codec;
        }
        curr = curr->next();
    }
    return NULL;
}

template SkImageDecoder_FormatReg* SkImageDecoder_FormatReg::gHead;

SkImageDecoder::Format SkImageDecoder::GetStreamFormat(SkStreamRewindable* stream) {
    const SkImageDecoder_FormatReg* curr = SkImageDecoder_FormatReg::Head();
    while (curr != NULL) {
        Format format = curr->factory()(stream);
        if (!stream->rewind()) {
            SkErrorInternals::SetError(kInvalidOperation_SkError,
                                       "Unable to rewind the image stream\n");
            return kUnknown_Format;
        }
        if (format != kUnknown_Format) {
            return format;
        }
        curr = curr->next();
    }
    return kUnknown_Format;
}