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| Public Sub ZoomImage(ByVal OutPutWidth As Long, ByVal OutputHeight As Long) Dim I As Long Dim L As Long Dim X As Long Dim Y As Long Dim Xb As Long Dim Yb As Long Dim Xe As Long Dim Ye As Long Dim M As Integer Dim N As Integer Dim CurR As Long Dim CurG As Long Dim CurB As Long Dim NxtR As Integer Dim NxtG As Integer Dim NxtB As Integer Dim DR As Single Dim DG As Single Dim DB As Single Dim DRt As Single Dim DGt As Single Dim DBt As Single Dim Xratio As Single Dim Yratio As Single Dim CurStep As Single Dim NxtStep As Single Dim NegN As Single On Error GoTo ErrLine If Not CanZoom Then Exit Sub Done = False OutPutWid = OutPutWidth - 1 OutPutHei = OutputHeight - 1 I = (Bits \ 8) - 1 ReDim ColTmp(I, InPutWid, OutPutHei) '先从Y方向进行缩放处理，结果保存在此中间数组内 ReDim ColOut(I, OutPutWid, OutPutHei) Xratio = OutPutWid / InPutWid Yratio = OutPutHei / InPutHei TimeZoom = timeGetTime NegN = 1 / Int(Yratio + 1) For X = 0 To InPutWid CurR = ColVal(0, X, 0) CurG = ColVal(1, X, 0) CurB = ColVal(2, X, 0) CurStep = 0 NxtStep = 0 For Y = 0 To InPutHei - 1 NxtStep = CurStep + Yratio Yb = CurStep Ye = NxtStep N = Ye - Yb ColTmp(0, X, Yb) = CurR ColTmp(1, X, Yb) = CurG ColTmp(2, X, Yb) = CurB M = Y + 1 NxtR = ColVal(0, X, M) NxtG = ColVal(1, X, M) NxtB = ColVal(2, X, M) If N > 1 Then DRt = (NxtR - CurR) * NegN DGt = (NxtG - CurG) * NegN DBt = (NxtB - CurB) * NegN DR = 0 DG = 0 DB = 0 For L = Yb + 1 To Ye - 1 DR = DR + DRt DG = DG + DGt DB = DB + DBt ColTmp(0, X, L) = CurR + DR ColTmp(1, X, L) = CurG + DG ColTmp(2, X, L) = CurB + DB Next End If CurStep = NxtStep CurR = NxtR CurG = NxtG CurB = NxtB Next ColTmp(0, X, OutPutHei) = NxtR ColTmp(1, X, OutPutHei) = NxtG ColTmp(2, X, OutPutHei) = NxtB Next NegN = 1 / Int(Xratio + 1) For Y = 0 To OutPutHei CurR = ColTmp(0, 0, Y) CurG = ColTmp(1, 0, Y) CurB = ColTmp(2, 0, Y) CurStep = 0 NxtStep = 0 For X = 0 To InPutWid - 1 NxtStep = CurStep + Xratio Xb = CurStep Xe = NxtStep N = Xe - Xb ColOut(0, Xb, Y) = CurR ColOut(1, Xb, Y) = CurG ColOut(2, Xb, Y) = CurB M = X + 1 NxtR = ColTmp(0, M, Y) NxtG = ColTmp(1, M, Y) NxtB = ColTmp(2, M, Y) If N > 1 Then DRt = (NxtR - CurR) * NegN DGt = (NxtG - CurG) * NegN DBt = (NxtB - CurB) * NegN DR = 0 DG = 0 DB = 0 For L = Xb + 1 To Xe - 1 DR = DR + DRt DG = DG + DGt DB = DB + DBt ColOut(0, L, Y) = CurR + DR ColOut(1, L, Y) = CurG + DG ColOut(2, L, Y) = CurB + DB Next End If CurStep = NxtStep CurR = NxtR CurG = NxtG CurB = NxtB Next ColOut(0, OutPutWid, Y) = NxtR ColOut(1, OutPutWid, Y) = NxtG ColOut(2, OutPutWid, Y) = NxtB Next Done = True TimeZoom = timeGetTime - TimeZoom CanPut = True Exit Sub ErrLine: MsgBox Err.Description End Sub |
| Dim ColTmp() As Byte '用于保存插值中间变量 Dim OutPutHei As Long '要插值的目标高度 Dim OutPutWid As Long '要插值的目标宽度 Public TimeZoom As Long '插值运算使用的时间 |
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