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上一篇日記記錄了怎么實時預覽圖像調整效果, 其實有個很大的問題, 影響了效率, 那就是在 QuickUpdateImage 中用指針 m_pBitmap 來分配內存, 這個函數調用是很頻繁的, 不停的new操作要浪費時間, 完全用 原先的m_kOrgImage來代替, 避免過多的new和delete , 可以加快速度,修改如下:
// 調整[亮度/對比度]
void CImgProcessDlg::OnBnClickedButtonAdjust()
{
//initialization
if (m_pHoldBitmap)
{
delete m_pHoldBitmap;
m_pHoldBitmap = NULL;
}
if (m_pBitmap)
{
delete m_pBitmap;
m_pBitmap = NULL;
}
m_pHoldBitmap = new KFreeImage;
m_pBitmap = new KFreeImage;
if (!m_pBitmap || !m_pHoldBitmap)
{
// TRACE("Out of Memory");
::AfxMessageBox(_T("Out of Memory"));
m_pHoldBitmap = NULL;
m_pBitmap = NULL;
return;
}
//handle zoom first
unsigned int W, H;
W = m_kOrgImage.GetWidth();
H = m_kOrgImage.GetHeight();
if(fabs(m_fZoom-1.0f) < 0.005f)
{
m_pHoldBitmap->CopyFrom(m_kOrgImage,0,0,W,H);
}
else
{
m_kOrgImage.Rescale(*m_pHoldBitmap, (int)(m_fZoom*W-0.05f),(int)(m_fZoom*H-0.05f),
m_eFilterMode);
}
//hold of original image
m_pBitmap->CopyFrom(m_kOrgImage,0,0,W,H);
CAdjustColors dlg(this);
INT_PTR ret = dlg.DoModal();
m_kOrgImage.CopyFrom(*m_pBitmap,0,0,W,H);
if (ret != IDOK)
{
UpdateImage(); //update to old image
}
else //IDOK
{
//adjust original image
para1 = dlg.m_dBrightness;
para2 = dlg.m_dContrast;
m_MenuCommand = IDC_BUTTON_ADJUST;
m_hThreadTools = CreateThread( NULL,
0,
RunImageToolsThread,
this,
0,
&dwThreadID );
}
//clean:
if (m_pBitmap)
{
delete m_pBitmap;
m_pBitmap = NULL;
}
if (m_pHoldBitmap)
{
delete m_pHoldBitmap;
m_pHoldBitmap = NULL;
}
}
//CAdjustColors 中響應此函數
void CImgProcessDlg::OnAdjustColors(double param1 /*= 0.0f*/, double param2 /*= 0.0f*/)
{
QuickUpdateImage(IDC_BUTTON_ADJUST,true,param1,param2);
}
//////////////////////////////////////////////////////////////////////////
//快速臨時的顯示圖片效果
void CImgProcessDlg::QuickUpdateImage(UINT type,
bool bRedraw /*= true*/,
double param1 /*= 0.0f*/,
double param2 /*= 0.0f*/)
{
if (!m_pHoldBitmap)
return;
unsigned int W, H;
W = m_pHoldBitmap->GetWidth();
H = m_pHoldBitmap->GetHeight();
m_kOrgImage.CopyFrom(*m_pHoldBitmap,0,0,W,H);//使用m_kOrgImage避免不停的用new來分配內存
switch(type)
{
case IDC_BUTTON_ADJUST:
m_kOrgImage.AdjustColors(param1, param2,1.0,FALSE);
break;
default:
break;
}
Init(m_kOrgImage);
if(bRedraw)
{
RECT r = m_Rect;
r.right = W < m_Rect.right ? W : m_Rect.right + 16;
r.bottom = H < m_Rect.bottom ? H : m_Rect.bottom + 16;
InvalidateRect(&r, FALSE);
}
}
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