www.pudn.com > hbp0.1.zip > cDIBsection.cls
VERSION 1.0 CLASS
BEGIN
MultiUse = -1 'True
Persistable = 0 'NotPersistable
DataBindingBehavior = 0 'vbNone
DataSourceBehavior = 0 'vbNone
MTSTransactionMode = 0 'NotAnMTSObject
END
Attribute VB_Name = "cDIBsection"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = True
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Option Explicit
Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" ( _
lpvDest As Any, lpvSource As Any, ByVal cbCopy As Long)
Private Type RGBQUAD
rgbBlue As Byte
rgbGreen As Byte
rgbRed As Byte
rgbReserved As Byte
End Type
Private Type BITMAPINFOHEADER '40 bytes
biSize As Long
biWidth As Long
biHeight As Long
biPlanes As Integer
biBitCount As Integer
biCompression As Long
biSizeImage As Long
biXPelsPerMeter As Long
biYPelsPerMeter As Long
biClrUsed As Long
biClrImportant As Long
End Type
Private Type BITMAPINFO
bmiHeader As BITMAPINFOHEADER
bmiColors As RGBQUAD
End Type
Private Declare Function CreateCompatibleDC Lib "gdi32" (ByVal hdc As Long) As Long
Private Declare Function GetDC Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function GetDesktopWindow Lib "user32" () As Long
' Note - this is not the declare in the API viewer - modify lplpVoid to be
' Byref so we get the pointer back:
Private Declare Function CreateDIBSection Lib "gdi32" _
(ByVal hdc As Long, _
pBitmapInfo As BITMAPINFO, _
ByVal un As Long, _
lplpVoid As Long, _
ByVal handle As Long, _
ByVal dw As Long) As Long
Private Declare Function BitBlt Lib "gdi32" (ByVal hDestDC As Long, ByVal x As Long, ByVal y As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hSrcDC As Long, ByVal xSrc As Long, ByVal ySrc As Long, ByVal dwRop As Long) As Long
Private Declare Function SelectObject Lib "gdi32" (ByVal hdc As Long, ByVal hObject As Long) As Long
Private Declare Function DeleteObject Lib "gdi32" (ByVal hObject As Long) As Long
Private Declare Function DeleteDC Lib "gdi32" (ByVal hdc As Long) As Long
Private Declare Function LoadImage Lib "user32" Alias "LoadImageA" (ByVal hInst As Long, ByVal lpsz As String, ByVal un1 As Long, ByVal n1 As Long, ByVal n2 As Long, ByVal un2 As Long) As Long
Private Const BI_RGB = 0&
Private Const BI_RLE4 = 2&
Private Const BI_RLE8 = 1&
Private Const DIB_RGB_COLORS = 0 ' color table in RGBs
Private Type BITMAP
bmType As Long
bmWidth As Long
bmHeight As Long
bmWidthBytes As Long
bmPlanes As Integer
bmBitsPixel As Integer
bmBits As Long
End Type
Private Declare Function GetObjectAPI Lib "gdi32" Alias "GetObjectA" (ByVal hObject As Long, ByVal nCount As Long, lpObject As Any) As Long
Private Declare Function timeGetTime Lib "winmm.dll" () As Long
Private Declare Function CreateCompatibleBitmap Lib "gdi32" (ByVal hdc As Long, ByVal nWidth As Long, ByVal nHeight As Long) As Long
' Clipboard functions:
Private Declare Function OpenClipboard Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function CloseClipboard Lib "user32" () As Long
Private Declare Function SetClipboardData Lib "user32" (ByVal wFormat As Long, ByVal hMem As Long) As Long
Private Declare Function EmptyClipboard Lib "user32" () As Long
Private Const CF_BITMAP = 2
Private Const CF_DIB = 8
' Handle to the current DIBSection:
Private m_hDIb As Long
' Handle to the old bitmap in the DC, for clear up:
Private m_hBmpOld As Long
' Handle to the Device context holding the DIBSection:
Private m_hDC As Long
' Address of memory pointing to the DIBSection's bits:
Private m_lPtr As Long
' Type containing the Bitmap information:
Private m_tBI As BITMAPINFO
Public Function CopyToClipboard( _
Optional ByVal bAsDIB As Boolean = True _
) As Boolean
Dim lhDCDesktop As Long
Dim lHDC As Long
Dim lhBmpOld As Long
Dim hObj As Long
Dim lFmt As Long
Dim b() As Byte
Dim tBI As BITMAPINFO
Dim lPtr As Long
Dim hDibCopy As Long
lhDCDesktop = GetDC(GetDesktopWindow())
If (lhDCDesktop <> 0) Then
lHDC = CreateCompatibleDC(lhDCDesktop)
If (lHDC <> 0) Then
If (bAsDIB) Then
MsgBox "I don't know how to put a DIB on the clipboard! Copy as bitmap instead!!!"
' Create a duplicate DIBSection and copy
' to the clipboard:
'LSet tBI = m_tBI
'hDibCopy = CreateDIBSection( _
' lhDC, _
' m_tBI, _
' DIB_RGB_COLORS, _
' lPtr, _
' 0, 0)
'If (hDibCopy <> 0) Then
' lhBmpOld = SelectObject(lhDC, hObj)
' BitBlt lhDC, 0, 0, Width, Height, m_hDC, 0, 0, vbSrcCopy
' SelectObject lhDC, lhBmpOld
' lFmt = CF_DIB
'
' '....
'Else
' hObj = 0
'End If
Else
' Create a compatible bitmap and copy to
' the clipboard:
hObj = CreateCompatibleBitmap(lhDCDesktop, width, height)
If (hObj <> 0) Then
lhBmpOld = SelectObject(lHDC, hObj)
PaintPicture lHDC
SelectObject lHDC, lhBmpOld
lFmt = CF_BITMAP
' Now set the clipboard to the bitmap:
If (OpenClipboard(0) <> 0) Then
EmptyClipboard
If (SetClipboardData(lFmt, hObj) <> 0) Then
CopyToClipboard = True
End If
CloseClipboard
End If
End If
End If
DeleteDC lHDC
End If
DeleteDC lhDCDesktop
End If
End Function
Public Function CreateDIB( _
ByVal lHDC As Long, _
ByVal lWidth As Long, _
ByVal lHeight As Long, _
ByRef hDib As Long _
) As Boolean
With m_tBI.bmiHeader
.biSize = Len(m_tBI.bmiHeader)
.biWidth = lWidth
.biHeight = lHeight
.biPlanes = 1
.biBitCount = 24
.biCompression = BI_RGB
.biSizeImage = BytesPerScanLine * .biHeight
End With
hDib = CreateDIBSection( _
lHDC, _
m_tBI, _
DIB_RGB_COLORS, _
m_lPtr, _
0, 0)
CreateDIB = (hDib <> 0)
End Function
Public Function CreateFromPicture( _
ByRef picThis As StdPicture _
)
Dim lHDC As Long
Dim lhDCDesktop As Long
Dim lhBmpOld As Long
Dim tBMP As BITMAP
GetObjectAPI picThis.handle, Len(tBMP), tBMP
If (Create(tBMP.bmWidth, tBMP.bmHeight)) Then
lhDCDesktop = GetDC(GetDesktopWindow())
If (lhDCDesktop <> 0) Then
lHDC = CreateCompatibleDC(lhDCDesktop)
DeleteDC lhDCDesktop
If (lHDC <> 0) Then
lhBmpOld = SelectObject(lHDC, picThis.handle)
LoadPictureBlt lHDC
SelectObject lHDC, lhBmpOld
DeleteObject lHDC
End If
End If
End If
End Function
Public Function Create( _
ByVal lWidth As Long, _
ByVal lHeight As Long _
) As Boolean
ClearUp
m_hDC = CreateCompatibleDC(0)
If (m_hDC <> 0) Then
If (CreateDIB(m_hDC, lWidth, lHeight, m_hDIb)) Then
m_hBmpOld = SelectObject(m_hDC, m_hDIb)
Create = True
Else
DeleteObject m_hDC
m_hDC = 0
End If
End If
End Function
Public Property Get BytesPerScanLine() As Long
' Scans must align on dword boundaries:
BytesPerScanLine = (m_tBI.bmiHeader.biWidth * 3 + 3) And &HFFFFFFFC
End Property
Public Property Get width() As Long
width = m_tBI.bmiHeader.biWidth
End Property
Public Property Get height() As Long
height = m_tBI.bmiHeader.biHeight
End Property
Public Sub LoadPictureBlt( _
ByVal lHDC As Long, _
Optional ByVal lSrcLeft As Long = 0, _
Optional ByVal lSrcTop As Long = 0, _
Optional ByVal lSrcWidth As Long = -1, _
Optional ByVal lSrcHeight As Long = -1, _
Optional ByVal eRop As RasterOpConstants = vbSrcCopy _
)
If lSrcWidth < 0 Then lSrcWidth = m_tBI.bmiHeader.biWidth
If lSrcHeight < 0 Then lSrcHeight = m_tBI.bmiHeader.biHeight
BitBlt m_hDC, 0, 0, lSrcWidth, lSrcHeight, lHDC, lSrcLeft, lSrcTop, eRop
End Sub
Public Sub PaintPicture( _
ByVal lHDC As Long, _
Optional ByVal lDestLeft As Long = 0, _
Optional ByVal lDestTop As Long = 0, _
Optional ByVal lDestWidth As Long = -1, _
Optional ByVal lDestHeight As Long = -1, _
Optional ByVal lSrcLeft As Long = 0, _
Optional ByVal lSrcTop As Long = 0, _
Optional ByVal eRop As RasterOpConstants = vbSrcCopy _
)
If (lDestWidth < 0) Then lDestWidth = m_tBI.bmiHeader.biWidth
If (lDestHeight < 0) Then lDestHeight = m_tBI.bmiHeader.biHeight
BitBlt lHDC, lDestLeft, lDestTop, lDestWidth, lDestHeight, m_hDC, lSrcLeft, lSrcTop, eRop
End Sub
Public Property Get hdc() As Long
hdc = m_hDC
End Property
Public Property Get hDib() As Long
hDib = m_hDIb
End Property
Public Property Get DIBSectionBitsPtr() As Long
DIBSectionBitsPtr = m_lPtr
End Property
Public Sub RandomiseBits( _
Optional ByVal bGray As Boolean = False _
)
Dim bDib() As Byte
Dim x As Long, y As Long
Dim lC As Long
Dim tSA As SAFEARRAY2D
Dim xEnd As Long
' Get the bits in the from DIB section:
With tSA
.cbElements = 1
.cDims = 2
.Bounds(0).lLbound = 0
.Bounds(0).cElements = m_tBI.bmiHeader.biHeight
.Bounds(1).lLbound = 0
.Bounds(1).cElements = BytesPerScanLine()
.pvData = m_lPtr
End With
CopyMemory ByVal VarPtrArray(bDib()), VarPtr(tSA), 4
' random:
Randomize Timer
xEnd = (width - 1) * 3
If (bGray) Then
For y = 0 To m_tBI.bmiHeader.biHeight - 1
For x = 0 To xEnd Step 3
lC = Rnd * 255
bDib(x, y) = lC
bDib(x + 1, y) = lC
bDib(x + 2, y) = lC
Next x
Next y
Else
For x = 0 To xEnd Step 3
For y = 0 To m_tBI.bmiHeader.biHeight - 1
bDib(x, y) = 0
bDib(x + 1, y) = Rnd * 255
bDib(x + 2, y) = Rnd * 255
Next y
Next x
End If
' Clear the temporary array descriptor
' This is necessary under NT4.
CopyMemory ByVal VarPtrArray(bDib), 0&, 4
End Sub
Public Sub ClearUp()
If (m_hDC <> 0) Then
If (m_hDIb <> 0) Then
SelectObject m_hDC, m_hBmpOld
DeleteObject m_hDIb
End If
DeleteObject m_hDC
End If
m_hDC = 0: m_hDIb = 0: m_hBmpOld = 0: m_lPtr = 0
End Sub
Public Function Resample( _
ByVal lNewHeight As Long, _
ByVal lNewWidth As Long _
) As cDIBsection
Dim cDib As cDIBsection
Set cDib = New cDIBsection
If cDib.Create(lNewWidth, lNewHeight) Then
If (lNewWidth <> m_tBI.bmiHeader.biWidth) Or (lNewHeight <> m_tBI.bmiHeader.biHeight) Then
' Change in size, do resample:
ResampleDib cDib
Else
' No size change so just return a copy:
cDib.LoadPictureBlt m_hDC
End If
Set Resample = cDib
End If
End Function
Private Function ResampleDib(ByRef cDibTo As cDIBsection) As Boolean
Dim bDibFrom() As Byte
Dim bDibTo() As Byte
Dim tSAFrom As SAFEARRAY2D
Dim tSATo As SAFEARRAY2D
' Get the bits in the from DIB section:
With tSAFrom
.cbElements = 1
.cDims = 2
.Bounds(0).lLbound = 0
.Bounds(0).cElements = m_tBI.bmiHeader.biHeight
.Bounds(1).lLbound = 0
.Bounds(1).cElements = BytesPerScanLine()
.pvData = m_lPtr
End With
CopyMemory ByVal VarPtrArray(bDibFrom()), VarPtr(tSAFrom), 4
' Get the bits in the to DIB section:
With tSATo
.cbElements = 1
.cDims = 2
.Bounds(0).lLbound = 0
.Bounds(0).cElements = cDibTo.height
.Bounds(1).lLbound = 0
.Bounds(1).cElements = cDibTo.BytesPerScanLine()
.pvData = cDibTo.DIBSectionBitsPtr
End With
CopyMemory ByVal VarPtrArray(bDibTo()), VarPtr(tSATo), 4
Dim xScale As Single
Dim yScale As Single
Dim x As Long, y As Long, xEnd As Long, xOut As Long
Dim fX As Single, fY As Single
Dim ifY As Long, ifX As Long
Dim dx As Single, dy As Single
Dim r As Long, r1 As Single, r2 As Single, r3 As Single, r4 As Single
Dim g As Long, g1 As Single, g2 As Single, g3 As Single, g4 As Single
Dim b As Long, b1 As Single, b2 As Single, b3 As Single, b4 As Single
Dim ir1 As Long, ig1 As Long, ib1 As Long
Dim ir2 As Long, ig2 As Long, ib2 As Long
xScale = (width - 1) / cDibTo.width
yScale = (height - 1) / cDibTo.height
xEnd = cDibTo.width - 1
For y = 0 To cDibTo.height - 1
fY = y * yScale
ifY = Int(fY)
dy = fY - ifY
For x = 0 To xEnd
fX = x * xScale
ifX = Int(fX)
dx = fX - ifX
ifX = ifX * 3
' Interpolate using the four nearest pixels in the source
b1 = bDibFrom(ifX, ifY): g1 = bDibFrom(ifX + 1, ifY): r1 = bDibFrom(ifX + 2, ifY)
b2 = bDibFrom(ifX + 3, ifY): g2 = bDibFrom(ifX + 4, ifY): r2 = bDibFrom(ifX + 5, ifY)
b3 = bDibFrom(ifX, ifY + 1): g3 = bDibFrom(ifX + 1, ifY + 1): r3 = bDibFrom(ifX + 2, ifY + 1)
b4 = bDibFrom(ifX + 3, ifY + 1): g4 = bDibFrom(ifX + 4, ifY + 1): r4 = bDibFrom(ifX + 5, ifY + 1)
' Interplate in x direction:
ir1 = r1 * (1 - dy) + r3 * dy: ig1 = g1 * (1 - dy) + g3 * dy: ib1 = b1 * (1 - dy) + b3 * dy
ir2 = r2 * (1 - dy) + r4 * dy: ig2 = g2 * (1 - dy) + g4 * dy: ib2 = b2 * (1 - dy) + b4 * dy
' Interpolate in y:
r = ir1 * (1 - dx) + ir2 * dx: g = ig1 * (1 - dx) + ig2 * dx: b = ib1 * (1 - dx) + ib2 * dx
' Set output:
If (r < 0) Then r = 0
If (r > 255) Then r = 255
If (g < 0) Then g = 0
If (g > 255) Then g = 255
If (b < 0) Then b = 0
If (b > 255) Then
b = 255
End If
xOut = x * 3
bDibTo(xOut, y) = b
bDibTo(xOut + 1, y) = g
bDibTo(xOut + 2, y) = r
Next x
Next y
' Clear the temporary array descriptor
' This is necessary under NT4.
CopyMemory ByVal VarPtrArray(bDibFrom), 0&, 4
CopyMemory ByVal VarPtrArray(bDibTo), 0&, 4
End Function
Private Sub Class_Terminate()
ClearUp
End Sub