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/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkJpegPriv_DEFINED
#define SkJpegPriv_DEFINED
#include "include/codec/SkEncodedOrigin.h"
#include "include/core/SkStream.h"
#include "include/private/base/SkTArray.h"
#include <setjmp.h>
// stdio is needed for jpeglib
#include <stdio.h>
extern "C" {
#include "jpeglib.h" // NO_G3_REWRITE
#include "jerror.h" // NO_G3_REWRITE
}
/*
* Error handling struct
*/
struct skjpeg_error_mgr : jpeg_error_mgr {
class AutoPushJmpBuf {
public:
AutoPushJmpBuf(skjpeg_error_mgr* mgr) : fMgr(mgr) { fMgr->push(&fJmpBuf); }
~AutoPushJmpBuf() { fMgr->pop(&fJmpBuf); }
operator jmp_buf&() { return fJmpBuf; }
private:
skjpeg_error_mgr* const fMgr;
jmp_buf fJmpBuf;
};
void push(jmp_buf* j) {
SkASSERT(fStack[3] == nullptr); // if we assert here, the stack has overflowed
fStack[3] = fStack[2];
fStack[2] = fStack[1];
fStack[1] = fStack[0];
fStack[0] = j;
}
void pop(jmp_buf* j) {
SkASSERT(fStack[0] == j); // if we assert here, the pushes and pops were unbalanced
fStack[0] = fStack[1];
fStack[1] = fStack[2];
fStack[2] = fStack[3];
fStack[3] = nullptr;
}
jmp_buf* fStack[4] = {};
};
#endif
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