pdata->mipi_host_node = of_graph_get_remote_node(np, 0, 0);这段是什么意思
时间: 2024-04-26 15:24:05 浏览: 6
这段代码是获取 MIPI 主机设备节点的指针。`np` 是当前设备节点的指针,`of_graph_get_remote_node()` 函数的作用是获取与当前节点相连的远端节点的指针。`pdata->mipi_host_node` 是 MIPI 主机设备节点的指针,通过 `of_graph_get_remote_node(np, 0, 0)` 获取与当前节点相连的第一个远端节点的指针,并将其赋值给 `pdata->mipi_host_node` 变量。这段代码主要用于设备树中节点之间的关联,具体的用法可以参考 Linux 内核的文档。
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void CMyImageView::OnBianyuan() { // TODO: 在此添加命令处理程序代码 CMyImageDoc* pDoc = GetDocument();//获取文档指针 ASSERT_VALID(pDoc); suanzi dlginputyuzhi;//定义阈值对话框类对象 dlginputyuzhi.DoModal();//弹出对话框 UpdateData(TRUE); if (pDoc->m_pDib == NULL) { AfxMessageBox("Error!"); return; } int mcols = pDoc->m_pDib->m_nCols; int mrows = pDoc->m_pDib->m_nRows; unsigned char* m_pData = NULL; m_pData = pDoc->m_pDib->pImgData; unsigned char* m_pDataOldPos = m_pData; unsigned char* a; int* b = NULL; int irows, jcols; int max = 0; int min = 255; vector<int>v; for (irows = 0; irows < mrows; irows++) { for (jcols = 0; jcols < mcols; jcols++) { int j = 0; int p = 0, q = 0; m_pData += irows * mcols + jcols; j += irows * mcols + jcols; if (j > mcols && (j + 1) % mcols != 0 && j < (mrows * (mcols - 1))) { p = 4 * (*m_pData) - *(m_pData + 1) - *(m_pData - 1) - *(m_pData - mcols) - *(m_pData + mcols); if (p > dlginputyuzhi.suanzi_1) { v.push_back(0); } else { v.push_back(255); } } m_pData = m_pDataOldPos; } } int aq = 0; for (irows = 0; irows < mrows; irows++) { for (jcols = 0; jcols < mcols; jcols++) { int j = 0; int p = 0, q = 0; m_pData += irows * mcols + jcols; j += irows * mcols + jcols; if (j > mcols && (j + 1) % mcols != 0 && j < (mrows * (mcols - 1))) { *m_pData = v[aq]; aq++; } m_pData = m_pDataOldPos; } } for (irows = 0; irows < mrows; irows++) { for (jcols = 0; jcols < mcols; jcols++) { int j = 0; int p = 0, q = 0; m_pData += irows * mcols + jcols; j += irows * mcols + jcols; if (irows>0&&irows<mrows-1&&jcols>0&&jcols<mcols-1) { if (*m_pData==0) { if (*(m_pData + 1) == 0 || *(m_pData - 1) == 0 || *(m_pData - mcols) == 0 || *(m_pData + mcols) == 0) { } else { *m_pData = 255; } } } m_pData = m_pDataOldPos; } } pDoc->UpdateAllViews(NULL); }仿照此代码,将其中的sobel算子改成Robert算子
void CMyImageView::OnBianyuan() {
// TODO: 在此添加命令处理程序代码
CMyImageDoc* pDoc = GetDocument();//获取文档指针
ASSERT_VALID(pDoc);
suanzi dlginputyuzhi;//定义阈值对话框类对象
dlginputyuzhi.DoModal();//弹出对话框
UpdateData(TRUE);
if (pDoc->m_pDib == NULL) {
AfxMessageBox("Error!");
return;
}
int mcols = pDoc->m_pDib->m_nCols;
int mrows = pDoc->m_pDib->m_nRows;
unsigned char* m_pData = NULL;
m_pData = pDoc->m_pDib->pImgData;
unsigned char* m_pDataOldPos = m_pData;
unsigned char* a;
int* b = NULL;
int irows, jcols;
int max = 0;
int min = 255;
vector<int>v;
for (irows = 0; irows < mrows; irows++) {
for (jcols = 0; jcols < mcols; jcols++) {
int j = 0;
int p = 0, q = 0;
m_pData += irows * mcols + jcols;
j += irows * mcols + jcols;
if (j > mcols && (j + 1) % mcols != 0 && j < (mrows * (mcols - 1))) {
// Robert算子
p = abs(*m_pData - *(m_pData + mcols + 1)) + abs(*(m_pData + 1) - *(m_pData + mcols));
if (dlginputyuzhi.suanzi_1 != 0 && p > dlginputyuzhi.suanzi_1) {
v.push_back(0);
}
else {
v.push_back(255);
}
}
m_pData = m_pDataOldPos;
}
}
int aq = 0;
for (irows = 0; irows < mrows; irows++) {
for (jcols = 0; jcols < mcols; jcols++) {
int j = 0;
int p = 0, q = 0;
m_pData += irows * mcols + jcols;
j += irows * mcols + jcols;
if (j > mcols && (j + 1) % mcols != 0 && j < (mrows * (mcols - 1))) {
*m_pData = v[aq];
aq++;
}
m_pData = m_pDataOldPos;
}
}
for (irows = 0; irows < mrows; irows++) {
for (jcols = 0; jcols < mcols; jcols++) {
int j = 0;
int p = 0, q = 0;
m_pData += irows * mcols + jcols;
j += irows * mcols + jcols;
if (irows > 0 && irows < mrows - 1 && jcols > 0 && jcols < mcols - 1) {
if (*m_pData == 0) {
if (*(m_pData + 1) == 0 || *(m_pData - 1) == 0 || *(m_pData - mcols) == 0 || *(m_pData + mcols) == 0) {
}
else {
*m_pData = 255;
}
}
}
m_pData = m_pDataOldPos;
}
}
pDoc->UpdateAllViews(NULL);
}
int DeleteVex(const AlGraph *g,VerType adata) { int qq=0; ArcNode *p,*del,*pre; int pdata=LocateVertex(g,adata);//定位结点位置 if(pdata<0)//结点不存在,返回错误信息 return ERROR; p=g->vexs[pdata].firstarc; while(p) { p=p->nextarc; } int i; for(i=pdata;i<g->vexnum-1;i++)//数组内容移位 { g->vexs[i].vexinfo=g->vexs[i+1].vexinfo; g->vexs[i].firstarc=g->vexs[i+1].firstarc;//顶点信息和第一条弧的指针都移位 } g->vexs[g->vexnum-1].vexinfo=-1; g->vexs[g->vexnum-1].firstarc=NULL; for(i=0;i<g->vexnum;i++) { p=g->vexs[i].firstarc; while(p) { if(p->adjvex==pdata) { if(p==g->vexs[i].firstarc) { del=p; p=p->nextarc; g->vexs[i].firstarc=p; pre=NULL; free(del); break; } else { del=p; p=p->nextarc; pre->nextarc=p; free(del); break; } } else if(p->adjvex>pdata) { p->adjvex--; } pre=p; p=p->nextarc; } } return OK; } 优化一下这段代码,并指出问题
这段代码的问题是比较明显的,即删除顶点的过程中没有释放该顶点对应的边信息,导致内存泄漏。同时,删除顶点时采用了数组移位的方式,效率较低,可以使用指针交换的方式来优化。
下面是代码的优化版:
```
int DeleteVex(AlGraph *g, VerType adata) {
int pdata = LocateVertex(g, adata);
if (pdata < 0) return ERROR; //结点不存在,返回错误信息
//释放该顶点对应的边信息
ArcNode *p = g->vexs[pdata].firstarc, *del;
while (p) {
del = p;
p = p->nextarc;
free(del);
}
g->vexs[pdata].firstarc = NULL;
//将最后一个顶点信息和第一条弧的指针移到删除的位置
int last = g->vexnum - 1;
g->vexs[pdata].vexinfo = g->vexs[last].vexinfo;
g->vexs[pdata].firstarc = g->vexs[last].firstarc;
//更新其他边信息中的顶点位置
for (p = g->vexs[pdata].firstarc; p; p = p->nextarc) {
int adjvex = p->adjvex;
if (adjvex > pdata) {
p->adjvex--;
}
else if (adjvex == pdata) {
p->adjvex = last;
}
}
//清空最后一个顶点信息
g->vexs[last].vexinfo = -1;
g->vexs[last].firstarc = NULL;
g->vexnum--;
return OK;
}
```
优化后的代码采用了指针交换的方式,可以避免数组移位操作,提高了效率。同时,在删除顶点时释放了对应的边信息,避免了内存泄漏。