WINCE/WIN32的第三方BMP操作类库----DIBSectionCE类
在文章 移动设备上使用openCV 中讲到
WINCE/WIN32的第三方BMP操作类库----DIBSectionCE类
现在对它具体来分析：
1、介绍
CDIBSectionCE是CDibCE的子类。
Device Independant Bitmaps(DIB)提供一个在你的电脑的当前显示器配置下的来操纵并显示bitmaps的途径,.
它们也是标准window .BMP图的一种格式，这样有一种方法来加载、显示并修改DIBs是非常方便的。
Win32提供了许多不同的方法来处理DIB,包括标准的DIB功能，比如 SetBitsToDevice,GetDIBits、DrawDib函数等，
其中DrawDib是类似于DIBsections.
然而当工作在CE环境时，许多有用的函数被抛弃了，目的是为了减少OS的大小；
这样我们就只能用DDB（通过CBitmap）或DIBSections.它不是太方便的，即使因为DIBSections在DIBs是很强大的（因为我们有一个绑定的HBITMAP句柄）,
因此能被GID函数操作，比如BitBlt和StrechBlt。此外这个DIBSection句柄也能被选择到一个内存DC中，并且用TextOut等直接画。
它是更容易地去访问DIB的bits，并一个一个地操作像素点.
DIBsections仅有的问题是DIBsection wrapper. 这是由于MFC版本的不断更新。
随着CE的到来，DIBSections显得重要。这里我们设计了CDIBSectionCE class - a DIBSection wrapper class.
此类提供了一个DIBSections的接口，包括加载、保存、显示DIBSections.
1、1、创建并显示DIBSections
创建DIBSections 的第一步是去填写BITMAPINFOHEADER结构体。它用于查询你支持的bitmap值。
不幸的是CE中没有这个功能，你必须自己去实现。虽然CE中有获得你提供的bitmap 的颜色表的功能。
但它它只解析DIBSections本身的颜色表信息。CDIBSections通过合成 half-tone 颜色表 获得此功能。
一旦你有BITMAPINFOHEADER结构体了，接下来就是简单调用CreateDIBSections.
这个函数将会返回一个HBITMAP句柄（指向真实的image bits）。
在CE中，有一些函数是丢失的，eg： GDIFlush和SetStretchBltMode，但是通过DIBSections创建的HBITMAP在用HBITMAP是没有困难的。
1、2 使用CDIBSectionsCE
它能通过SetBitmap() 或 Load()从disk中加载图像。
eg:
1、3 CDIBsectionCE API
CDIBSection API包括了加载、显示图片；解析图片信息的方法，palette的获得。
2、实现过程
把对应的.h .cpp与大家共享
#if !defined(AFX_CDIBSECTIONCE_H__35D9F3D4_B960_11D2_A981_2C4476000000__INCLUDED_)
#define AFX_CDIBSECTIONCE_H__35D9F3D4_B960_11D2_A981_2C4476000000__INCLUDED_
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
// DIBSectionCE.h : header file
//
// Copyright ?Dundas Software Ltd. 1999, All Rights Reserved
// //
// Properties:
// NO Abstract class (does not have any objects)
// NO Derived from CWnd
// NO Is a CWnd.
// NO Two stage creation (constructor & Create())
// NO Has a message map
// NO Needs a resource (template)
// YES Persistent objects (saveable on disk)
// YES Uses exceptions
// //
// Desciption :
// CDIBSectionCE is DIBSection wrapper class for win32 and WinCE platforms.
// This class provides a simple interface to DIBSections including loading,
// saving and displaying DIBsections.
//
// Full palette support is provided for Win32 and CE 2.11 and above.
// Using CDIBSectionCE :
// This class is very simple to use. The bitmap can be set using either SetBitmap()
// (which accepts either a Device dependant or device independant bitmap, or a
// resource ID) or by using Load(), which allows an image to be loaded from disk.
// To display the bitmap simply use Draw or Stretch.
//
// eg.
//
// CDIBsection dibsection;
// dibsection.Load(_T("image.bmp"));
// dibsection.Draw(pDC, CPoint(0,0)); // pDC is of type CDC*
//
// CDIBsection dibsection;
// dibsection.SetBitmap(IDB_BITMAP);
// dibsection.Draw(pDC, CPoint(0,0)); // pDC is of type CDC*
//
// The CDIBsection API includes many methods to extract information about the
// image, as well as palette options for getting and setting the current palette.
//
// Author: Chris Maunder ([email protected])
// Date : 12 April 1999
/
// defines
// Only provide palette support for non-CE platforms, or for CE 2.11 and above
#if defined(_WIN32_WCE) && (_WIN32_WCE < 211)
#define DIBSECTION_NO_PALETTE
// Dummy defn for CPalette if it is not available
#ifndef CPalette
#define CPalette void
#endif
#endif
#define DS_BITMAP_FILEMARKER ((WORD) ('M' << 8) | 'B') // is always "BM" = 0x4D42
/
// BITMAPINFO wrapper
struct DIBINFO : public BITMAPINFO
{
RGBQUAD arColors[255]; // Color table info - adds an extra 255 entries to palette
operator LPBITMAPINFO() { return (LPBITMAPINFO) this; }
operator LPBITMAPINFOHEADER() { return &bmiHeader; }
RGBQUAD* ColorTable() { return bmiColors; }
};
/
// LOGPALETTE wrapper
#ifndef DIBSECTION_NO_PALETTE
struct PALETTEINFO : public LOGPALETTE
{
PALETTEENTRY arPalEntries[255]; // Palette entries
PALETTEINFO() { palVersion = (WORD) 0x300; }
operator LPLOGPALETTE() { return (LPLOGPALETTE) this; }
operator LPPALETTEENTRY() { return (LPPALETTEENTRY) (palPalEntry); }
};
#endif // DIBSECTION_NO_PALETTE
/
// CDIBSectionCE object
class CDIBSectionCE : public CObject
{
// Construction
public:
CDIBSectionCE();
virtual ~CDIBSectionCE();
void DeleteObject();
// static helpers
public:
static int BytesPerLine(int nWidth, int nBitsPerPixel);
static int NumColorEntries(int nBitsPerPixel);
static RGBQUAD ms_StdColours[];
#ifndef DIBSECTION_NO_PALETTE
static BOOL UsesPalette(CDC* pDC) { return (pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE); }
static BOOL CreateHalftonePalette(CPalette& palette, int nNumColours);
#endif // DIBSECTION_NO_PALETTE
// Attributes
public:
HBITMAP GetSafeHandle() const { return (this)? m_hBitmap : NULL; }
CSize GetSize() const { return CSize(GetWidth(), GetHeight()); }
int GetHeight() const { return m_DIBinfo.bmiHeader.biHeight; }
int GetWidth() const { return m_DIBinfo.bmiHeader.biWidth; }
int GetPlanes() const { return m_DIBinfo.bmiHeader.biPlanes; }
int GetBitCount() const { return m_DIBinfo.bmiHeader.biBitCount; }
LPVOID GetDIBits() { return m_ppvBits; }
LPBITMAPINFO GetBitmapInfo() { return (BITMAPINFO*) m_DIBinfo; }
DWORD GetImageSize() const { return m_DIBinfo.bmiHeader.biSizeImage; }
LPBITMAPINFOHEADER GetBitmapInfoHeader() { return (BITMAPINFOHEADER*) m_DIBinfo; }
LPRGBQUAD GetColorTable() { return m_DIBinfo.ColorTable(); }
BOOL SetBitmap(UINT nIDResource);
BOOL SetBitmap(LPCTSTR lpszResourceName);
BOOL SetBitmap(HBITMAP hBitmap, CPalette* pPalette = NULL);
BOOL SetBitmap(LPBITMAPINFO lpBitmapInfo, LPVOID lpBits);
#ifndef DIBSECTION_NO_PALETTE
CPalette *GetPalette() { return &m_Palette; }
BOOL SetPalette(CPalette* pPalette);
BOOL SetLogPalette(LOGPALETTE* pLogPalette);
#endif // DIBSECTION_NO_PALETTE
// Operations
public:
BOOL Load(LPCTSTR lpszFileName);
BOOL Save(LPCTSTR lpszFileName);
BOOL Draw(CDC* pDC, CPoint ptDest, BOOL bForceBackground = FALSE);
BOOL Stretch(CDC* pDC, CPoint ptDest, CSize size, BOOL bForceBackground = FALSE);
CDC* GetMemoryDC(CDC* pDC = NULL, BOOL bSelectPalette = TRUE);
BOOL ReleaseMemoryDC(BOOL bForceRelease = FALSE);
// Overrideables
// Implementation
public:
#ifdef _DEBUG
virtual void AssertValid() const;
// virtual void Dump(CDumpContext& dc) const;
#endif
// Implementation
protected:
void _ShowLastError();
#ifndef DIBSECTION_NO_PALETTE
BOOL CreatePalette();
BOOL FillDIBColorTable(UINT nNumColours, RGBQUAD *pRGB);
#endif // DIBSECTION_NO_PALETTE
UINT GetColorTableEntries(HDC hdc, HBITMAP hBitmap);
protected:
HBITMAP m_hBitmap; // Handle to DIBSECTION
DIBINFO m_DIBinfo; // Bitmap header & color table info
VOID *m_ppvBits; // Pointer to bitmap bits
UINT m_iColorDataType; // color data type (palette or RGB values)
UINT m_iColorTableSize; // Size of color table
CDC m_MemDC; // Memory DC for drawing on bitmap
BOOL m_bReuseMemDC; // Reeuse the memory DC? (Quicker, but maybe unsafe)
#ifndef DIBSECTION_NO_PALETTE
CPalette m_Palette; // Color palette
CPalette *m_pOldPalette;
#endif // DIBSECTION_NO_PALETTE
private:
HBITMAP m_hOldBitmap; // Storage for previous bitmap in Memory DC
};
/
//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.
#endif // !defined(AFX_CDIBSECTIONCE_H__35D9F3D4_B960_11D2_A981_2C4476000000__INCLUDED_)
// CDIBSectionCE.cpp : implementation file
//
// General purpose DIBsection wrapper class for Win9x, NT 4.0
// and WinCE.
//
// Author : Chris Maunder ([email protected])
// Date : 17 May 1999
//
// Copyright ?Dundas Software Ltd. 1999, All Rights Reserved
//
// This code may be used in compiled form in any way you desire. This
// file may be redistributed unmodified by any means PROVIDING it is
// not sold for profit without the authors written consent, and
// providing that this notice and the authors name is included. If
// the source code in this file is used in any commercial application
// then a simple email would be nice.
//
// This file is provided "as is" with no expressed or implied warranty.
// The author accepts no liability for any damage, in any form, caused
// by this code. Use it at your own risk and as with all code expect bugs!
// It's been tested but I'm not perfect.
//
// Please use and enjoy. Please let me know of any bugs/mods/improvements
// that you have found/implemented and I will fix/incorporate them into this
// file.
#include "stdafx.h"
#include "DIBSectionCE.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
// Use C++ exception handling instead of structured on non-CE platforms.
#ifndef _WIN32_WCE
#undef TRY
#undef CATCH
#undef END_CATCH
#define TRY try
#define CATCH(ex_class, ex_object) catch(ex_class* ex_object)
#define END_CATCH
#endif // _WIN32_WCE
// Standard colours
RGBQUAD CDIBSectionCE::ms_StdColours[] = {
{ 0x00, 0x00, 0x00, 0 }, // First 2 will be palette for monochrome bitmaps
{ 0xFF, 0xFF, 0xFF, 0 },
{ 0x00, 0x00, 0xFF, 0 }, // First 16 will be palette for 16 colour bitmaps
{ 0x00, 0xFF, 0x00, 0 },
{ 0x00, 0xFF, 0xFF, 0 },
{ 0xFF, 0x00, 0x00, 0 },
{ 0xFF, 0x00, 0xFF, 0 },
{ 0xFF, 0xFF, 0x00, 0 },
{ 0x00, 0x00, 0x80, 0 },
{ 0x00, 0x80, 0x00, 0 },
{ 0x00, 0x80, 0x80, 0 },
{ 0x80, 0x00, 0x00, 0 },
{ 0x80, 0x00, 0x80, 0 },
{ 0x80, 0x80, 0x00, 0 },
{ 0x80, 0x80, 0x80, 0 },
{ 0xC0, 0xC0, 0xC0, 0 },
};
/
// CE DIBSection global functions
UINT CEGetDIBColorTable(HDC hdc, UINT uStartIndex, UINT cEntries, RGBQUAD *pColors);
/
// CDIBSectionCE static functions
//
// --- In?: nBitsPerPixel - bits per pixel
// --- Out :
// --- Returns :The number of colours for this colour depth
// --- Effect : Returns the number of color table entries given the number
// of bits per pixel of a bitmap
/*static*/ int CDIBSectionCE::NumColorEntries(int nBitsPerPixel)
{
int nColors = 0;
switch (nBitsPerPixel)
{
case 1: nColors = 2; break;
#ifdef _WIN32_WCE
case 2: nColors = 4; break; // winCE only
#endif
case 4: nColors = 16; break;
case 8: nColors = 256; break;
case 16:
case 24:
case 32: nColors = 0; break; // 16,24 or 32 bpp have no color table
default:
ASSERT(FALSE);
}
return nColors;
}
//
// --- In?: nWidth - image width in pixels
// nBitsPerPixel - bits per pixel
// --- Out :
// --- Returns : Returns the number of storage bytes needed for each scanline
// in the bitmap
// --- Effect :
/*static*/ int CDIBSectionCE::BytesPerLine(int nWidth, int nBitsPerPixel)
{
int nBytesPerLine = nWidth * nBitsPerPixel;
nBytesPerLine = ( (nBytesPerLine + 31) & (~31) ) / 8;
return nBytesPerLine;
}
#ifndef DIBSECTION_NO_PALETTE
//
// --- In?: palette - reference to a palette object which will be filled
// nNumColours - number of colour entries to fill
// --- Out :
// --- Returns : TRUE on success, false otherwise
// --- Effect : Creates a halftone color palette independant of screen color depth.
// palette will be filled with the colors, and nNumColours is the No.
// of colors to file. If nNumColoursis 0 or > 256, then 256 colors are used.
/*static*/ BOOL CDIBSectionCE::CreateHalftonePalette(CPalette& palette, int nNumColours)
{
palette.DeleteObject();
int nNumStandardColours = sizeof(ms_StdColours) / sizeof(ms_StdColours[0]);
int nIndex = 0;
int nNumEntries = nNumColours;
if (nNumEntries <= 0 || nNumEntries > 256)
nNumEntries = 256;
PALETTEINFO PalInfo;
PalInfo.palNumEntries = (WORD) nNumEntries;
// The standard colours (16)
for (int i = 0; i < nNumStandardColours; i++)
{
if (nIndex >= nNumEntries)
break;
PalInfo.palPalEntry[nIndex].peRed = ms_StdColours[i].rgbRed;
PalInfo.palPalEntry[nIndex].peGreen = ms_StdColours[i].rgbGreen;
PalInfo.palPalEntry[nIndex].peBlue = ms_StdColours[i].rgbBlue;
PalInfo.palPalEntry[nIndex].peFlags = 0;
nIndex++;
}
// A colour cube (6 divisions = 216)
for (int blue = 0; blue <= 5; blue++)
for (int green = 0; green <= 5; green++)
for (int red = 0; red <= 5; red++)
{
if (nIndex >= nNumEntries)
break;
PalInfo.palPalEntry[nIndex].peRed = (BYTE) ((red*255)/5);
PalInfo.palPalEntry[nIndex].peGreen = (BYTE) ((green*255)/5);
PalInfo.palPalEntry[nIndex].peBlue = (BYTE) ((blue*255)/5);
PalInfo.palPalEntry[nIndex].peFlags = 0;
nIndex++;
}
// A grey scale (24 divisions)
for (int grey = 0; grey <= 23; grey++)
{
if (nIndex >= nNumEntries)
break;
PalInfo.palPalEntry[nIndex].peRed = (BYTE) (grey*255/23);
PalInfo.palPalEntry[nIndex].peGreen = (BYTE) (grey*255/23);
PalInfo.palPalEntry[nIndex].peBlue = (BYTE) (grey*255/23);
PalInfo.palPalEntry[nIndex].peFlags = 0;
nIndex++;
}
return palette.CreatePalette((LPLOGPALETTE) PalInfo);
}
#endif // DIBSECTION_NO_PALETTE
/
// CDIBSectionCE
CDIBSectionCE::CDIBSectionCE()
{
m_hBitmap = NULL;
m_hOldBitmap = NULL;
m_bReuseMemDC = FALSE;
DeleteObject(); // This will initialise to a known state - ie. empty
}
CDIBSectionCE::~CDIBSectionCE()
{
DeleteObject();
}
// --- In?:
// --- Out :
// --- Returns :
// --- Effect : Resets the object to an empty state, and frees all memory used.
void CDIBSectionCE::DeleteObject()
{
// Unselect the bitmap out of the memory DC before deleting bitmap
ReleaseMemoryDC(TRUE);
if (m_hBitmap)
::DeleteObject(m_hBitmap);
m_hBitmap = NULL;
m_ppvBits = NULL;
#ifndef DIBSECTION_NO_PALETTE
m_Palette.DeleteObject();
#endif
memset(&m_DIBinfo, 0, sizeof(m_DIBinfo));
m_iColorDataType = DIB_RGB_COLORS;
m_iColorTableSize = 0;
}
/
// CDIBSectionCE diagnostics
#ifdef _DEBUG
void CDIBSectionCE::AssertValid() const
{
ASSERT(m_hBitmap);
DIBSECTION ds;
DWORD dwSize = GetObject( m_hBitmap, sizeof(DIBSECTION), &ds );
ASSERT(dwSize == sizeof(DIBSECTION));
ASSERT(0 <= m_iColorTableSize && m_iColorTableSize <= 256);
CObject::AssertValid();
}
/*
void CDIBSectionCE::Dump(CDumpContext& dc) const
{
CObject::Dump(dc);
}
*/
#endif //_DEBUG
/
// CDIBSectionCE operations
// --- In?: pDC - Pointer to a device context
// ptDest - point at which the topleft corner of the image is drawn
// --- Out :
// --- Returns : TRUE on success
// --- Effect : Draws the image 1:1 on the device context
BOOL CDIBSectionCE::Draw(CDC* pDC, CPoint ptDest, BOOL bForceBackground /*=FALSE*/)
{
if (!m_hBitmap)
return FALSE;
CSize size = GetSize();
CPoint ptOrigin = CPoint(0,0);
// Create a memory DC compatible with the destination DC
CDC* pMemDC = GetMemoryDC(pDC, FALSE);
if (!pMemDC)
return FALSE;
#ifndef DIBSECTION_NO_PALETTE
// Select and realize the palette
CPalette* pOldPalette = NULL;
if (m_Palette.m_hObject && UsesPalette(pDC))
{
pOldPalette = pDC->SelectPalette(&m_Palette, bForceBackground);
pDC->RealizePalette();
}
#endif // DIBSECTION_NO_PALETTE
BOOL bResult = pDC->BitBlt(ptDest.x, ptDest.y, size.cx, size.cy, pMemDC,
ptOrigin.x, ptOrigin.y, SRCCOPY);
#ifndef DIBSECTION_NO_PALETTE
if (pOldPalette)
pDC->SelectPalette(pOldPalette, FALSE);
#endif // DIBSECTION_NO_PALETTE
ReleaseMemoryDC();
return bResult;
}
// --- In?: pDC - Pointer to a device context
// ptDest - point at which the topleft corner of the image is drawn
// size - size to stretch the image
// --- Out :
// --- Returns : TRUE on success
// --- Effect : Stretch draws the image to the desired size on the device context
BOOL CDIBSectionCE::Stretch(CDC* pDC, CPoint ptDest, CSize size,
BOOL bForceBackground /*=FALSE*/)
{
if (!m_hBitmap)
return FALSE;
CPoint ptOrigin = CPoint(0,0);
CSize imagesize = GetSize();
// Create a memory DC compatible with the destination DC
CDC* pMemDC = GetMemoryDC(pDC, FALSE);
if (!pMemDC)
return FALSE;
#ifndef DIBSECTION_NO_PALETTE
// Select and realize the palette
CPalette* pOldPalette = NULL;
if (m_Palette.m_hObject && UsesPalette(pDC))
{
pOldPalette = pDC->SelectPalette(&m_Palette, bForceBackground);
pDC->RealizePalette();
}
#endif // DIBSECTION_NO_PALETTE
#ifndef _WIN32_WCE
pDC->SetStretchBltMode(COLORONCOLOR);
#endif // _WIN32_WCE
BOOL bResult = pDC->StretchBlt(ptDest.x, ptDest.y, size.cx, size.cy,
pMemDC,
ptOrigin.x, ptOrigin.y, imagesize.cx, imagesize.cy,
SRCCOPY);
#ifndef DIBSECTION_NO_PALETTE
if (pOldPalette)
pDC->SelectPalette(pOldPalette, FALSE);
#endif // DIBSECTION_NO_PALETTE
ReleaseMemoryDC();
return bResult;
}
//
// Setting the bitmap...
// --- In?: nIDResource - resource ID
// --- Out :
// --- Returns : Returns TRUE on success, FALSE otherwise
// --- Effect : Initialises the bitmap from a resource. If failure, then object is
// initialised back to an empty bitmap.
BOOL CDIBSectionCE::SetBitmap(UINT nIDResource)
{
return SetBitmap(MAKEINTRESOURCE(nIDResource));
}
// --- In?: lpszResourceName - resource name
// --- Out :
// --- Returns : Returns TRUE on success, FALSE otherwise
// --- Effect : Initialises the bitmap from a resource. If failure, then object is
// initialised back to an empty bitmap.
BOOL CDIBSectionCE::SetBitmap(LPCTSTR lpszResourceName)
{
HBITMAP hBmp = (HBITMAP)::LoadImage(AfxGetResourceHandle(),
lpszResourceName,
IMAGE_BITMAP,
0,0,
#ifdef _WIN32_WCE
0
#else
LR_CREATEDIBSECTION
#endif
);
if (!hBmp)
{
TRACE0("Unable to LoadImage");
return FALSE;
}
BOOL bResult = SetBitmap(hBmp);
::DeleteObject(hBmp);
return bResult;
}
// --- In?: lpBitmapInfo - pointer to a BITMAPINFO structure
// lpBits - pointer to image bits
// --- Out :
// --- Returns : Returns TRUE on success, FALSE otherwise
// --- Effect : Initialises the bitmap using the information in lpBitmapInfo to determine
// the dimensions and colours, and the then sets the bits from the bits in
// lpBits. If failure, then object is initialised back to an empty bitmap.
BOOL CDIBSectionCE::SetBitmap(LPBITMAPINFO lpBitmapInfo, LPVOID lpBits)
{
DeleteObject();
if (!lpBitmapInfo || !lpBits)
return FALSE;
HDC hDC = NULL;
TRY {
BITMAPINFOHEADER& bmih = lpBitmapInfo->bmiHeader;
// Compute the number of colours in the colour table
m_iColorTableSize = NumColorEntries(bmih.biBitCount);
DWORD dwBitmapInfoSize = sizeof(BITMAPINFO) + m_iColorTableSize*sizeof(RGBQUAD);
// Copy over BITMAPINFO contents
memcpy(&m_DIBinfo, lpBitmapInfo, dwBitmapInfoSize);
// Should now have all the info we need to create the sucker.
//TRACE(_T("Width %d, Height %d, Bits/pixel %d, Image Size %d\n"),
// bmih.biWidth, bmih.biHeight, bmih.biBitCount, bmih.biSizeImage);
// Create a DC which will be used to get DIB, then create DIBsection
hDC = ::GetDC(NULL);
if (!hDC)
{
TRACE0("Unable to get DC\n");
AfxThrowResourceException();
}
m_hBitmap = CreateDIBSection(hDC, (const BITMAPINFO*) m_DIBinfo,
m_iColorDataType, &m_ppvBits, NULL, 0);
::ReleaseDC(NULL, hDC);
if (!m_hBitmap)
{
TRACE0("CreateDIBSection failed\n");
AfxThrowResourceException();
}
DWORD dwImageSize = m_DIBinfo.bmiHeader.biSizeImage;
if (dwImageSize == 0)
{
int nBytesPerLine = BytesPerLine(lpBitmapInfo->bmiHeader.biWidth,
lpBitmapInfo->bmiHeader.biBitCount);
dwImageSize = nBytesPerLine * lpBitmapInfo->bmiHeader.biHeight;
}
#ifndef _WIN32_WCE
// Flush the GDI batch queue
GdiFlush();
#endif
memcpy(m_ppvBits, lpBits, dwImageSize);
#ifndef DIBSECTION_NO_PALETTE
if (!CreatePalette())
{
TRACE0("Unable to create palette\n");
AfxThrowResourceException();
}
#endif // DIBSECTION_NO_PALETTE
}
CATCH (CException, e)
{
e->Delete();
_ShowLastError();
if (hDC)
::ReleaseDC(NULL, hDC);
DeleteObject();
return FALSE;
}
END_CATCH
return TRUE;
}
// --- In?: hBitmap - handle to image
// pPalette - optional palette to use when setting image
// --- Out :
// --- Returns : Returns TRUE on success, FALSE otherwise
// --- Effect : Initialises the bitmap from the HBITMAP supplied. If failure, then
// object is initialised back to an empty bitmap.
BOOL CDIBSectionCE::SetBitmap(HBITMAP hBitmap, CPalette* pPalette /*= NULL*/)
{
DeleteObject();
if (!hBitmap)
return FALSE;
// Get dimensions of bitmap
BITMAP bm;
if (!::GetObject(hBitmap, sizeof(bm),(LPVOID)&bm))
return FALSE;
bm.bmHeight = abs(bm.bmHeight);
CWindowDC dc(NULL);
#ifndef DIBSECTION_NO_PALETTE
CPalette* pOldPalette = NULL;
#endif // DIBSECTION_NO_PALETTE
TRY {
m_iColorTableSize = NumColorEntries(bm.bmBitsPixel);
// Initialize the BITMAPINFOHEADER in m_DIBinfo
BITMAPINFOHEADER& bih = m_DIBinfo.bmiHeader;
bih.biSize = sizeof(BITMAPINFOHEADER);
bih.biWidth = bm.bmWidth;
bih.biHeight = bm.bmHeight;
bih.biPlanes = 1; // Must always be 1 according to docs
bih.biBitCount = bm.bmBitsPixel;
bih.biCompression = BI_RGB;
bih.biSizeImage = BytesPerLine(bm.bmWidth, bm.bmBitsPixel) * bm.bmHeight;
bih.biXPelsPerMeter = 0;
bih.biYPelsPerMeter = 0;
bih.biClrUsed = 0;
bih.biClrImportant = 0;
GetColorTableEntries(dc.GetSafeHdc(), hBitmap);
#ifndef DIBSECTION_NO_PALETTE
// If we have a palette supplied, then set the palette (and hance DIB color
// table) using this palette
if (pPalette)
SetPalette(pPalette);
if (m_Palette.GetSafeHandle())
{
pOldPalette = dc.SelectPalette(&m_Palette, FALSE);
dc.RealizePalette();
}
#endif // DIBSECTION_NO_PALETTE
// Create it!
m_hBitmap = CreateDIBSection(dc.m_hDC,
(const BITMAPINFO*) m_DIBinfo,
m_iColorDataType,
&m_ppvBits,
NULL, 0);
#ifndef DIBSECTION_NO_PALETTE
if (pOldPalette)
dc.SelectPalette(pOldPalette, FALSE);
pOldPalette = NULL;
#endif // DIBSECTION_NO_PALETTE
if (!m_hBitmap)
{
TRACE0("Unable to CreateDIBSection\n");
AfxThrowResourceException();
}
#ifndef DIBSECTION_NO_PALETTE
// If palette was supplied then create a palette using the entries in the DIB
// color table.
if (!pPalette)
CreatePalette();
#endif // DIBSECTION_NO_PALETTE
// Need to copy the supplied bitmap onto the newly created DIBsection
CDC memDC, CopyDC;
if (!CopyDC.CreateCompatibleDC(&dc) || !memDC.CreateCompatibleDC(&dc))
{
TRACE0("Unable to create compatible DC's\n");
AfxThrowResourceException();
}
#ifndef DIBSECTION_NO_PALETTE
if (m_Palette.GetSafeHandle())
{
memDC.SelectPalette(&m_Palette, FALSE); memDC.RealizePalette();
CopyDC.SelectPalette(&m_Palette, FALSE); CopyDC.RealizePalette();
}
#endif // DIBSECTION_NO_PALETTE
#ifndef _WIN32_WCE
// Flush the GDI batch queue
GdiFlush();
#endif
HBITMAP hOldMemBitmap = (HBITMAP) SelectObject(memDC.m_hDC, hBitmap);
HBITMAP hOldCopyBitmap = (HBITMAP) SelectObject(CopyDC.m_hDC, m_hBitmap);
CopyDC.BitBlt(0,0, bm.bmWidth, bm.bmHeight, &memDC, 0,0, SRCCOPY);
SelectObject(memDC.m_hDC, hOldMemBitmap);
SelectObject(CopyDC.m_hDC, hOldCopyBitmap);
#ifndef DIBSECTION_NO_PALETTE
if (m_Palette.GetSafeHandle())
{
memDC.SelectStockObject(DEFAULT_PALETTE);
CopyDC.SelectStockObject(DEFAULT_PALETTE);
}
#endif // DIBSECTION_NO_PALETTE
}
CATCH (CException, e)
{
e->Delete();
_ShowLastError();
#ifndef DIBSECTION_NO_PALETTE
if (pOldPalette)
dc.SelectPalette(pOldPalette, FALSE);
#endif // DIBSECTION_NO_PALETTE
DeleteObject();
return FALSE;
}
END_CATCH
return TRUE;
}
//
// Persistance...
// --- In?: lpszFileName - image filename
// --- Out :
// --- Returns : Returns TRUE on success, FALSE otherwise
// --- Effect : Loads the bitmap from a bitmap file with the name lpszFileName.
// If failure, then object is initialised back to an empty bitmap.
BOOL CDIBSectionCE::Load(LPCTSTR lpszFileName)
{
CFile file;
if (!file.Open(lpszFileName, CFile::modeRead))
return FALSE;
// 获得当前的文件位置.
DWORD dwFileStart = file.GetPosition();
// 文件的第一部分包含文件头.
// 这个将告诉我们是不是它是一个bitmap,头有多大，并且文件多大。
// 文件头中的头的大小包含了颜色表.
BITMAPFILEHEADER BmpFileHdr;
int nBytes;
nBytes = file.Read(&BmpFileHdr, sizeof(BmpFileHdr));
if (nBytes != sizeof(BmpFileHdr))
{
TRACE0("Failed to read file header\n");
return FALSE;
}
// 检查在开始地址是不是含有 'BM'.
if (BmpFileHdr.bfType != DS_BITMAP_FILEMARKER)
{
TRACE0("Not a bitmap file\n");
return FALSE;
}
// 读头 (assuming it's a DIB).
DIBINFO BmpInfo;
nBytes = file.Read(&BmpInfo, sizeof(BITMAPINFOHEADER));
if (nBytes != sizeof(BITMAPINFOHEADER))
{
TRACE0("Failed to read BITMAPINFOHEADER\n");
return FALSE;
}
// 检查我们有一个真实的window DIB 文件.
if (BmpInfo.bmiHeader.biSize != sizeof(BITMAPINFOHEADER))
{
TRACE0(" File is not a Windows DIB\n");
return FALSE;
}
// 看颜色表有多大 (if there is one).
int nColors = NumColorEntries(BmpInfo.bmiHeader.biBitCount);
if (nColors > 0)
{
// 读颜色表.
int nColorTableSize = nColors * sizeof(RGBQUAD);
nBytes = file.Read(BmpInfo.ColorTable(), nColorTableSize);
if (nBytes != nColorTableSize)
{
TRACE0("Failed to read color table\n");
return FALSE;
}
}
// bitmap surface有多大.
int nBitsSize = BmpFileHdr.bfSize - BmpFileHdr.bfOffBits;
// 为bits分配内存，并从文件中读bits.
BYTE* pBits = (BYTE*) malloc(nBitsSize);
if (!pBits)
{
TRACE0("Out of memory for DIB bits\n");
return FALSE;
}
// 在文件中跳到所要的位置.
file.Seek(dwFileStart + BmpFileHdr.bfOffBits, CFile::begin);
// read the bits
nBytes = file.Read(pBits, nBitsSize);
if (nBytes != nBitsSize)
{
TRACE0("Failed to read bits\n");
free(pBits);
return FALSE;
}
// Everything went OK.
BmpInfo.bmiHeader.biSizeImage = nBitsSize;
if (!SetBitmap((LPBITMAPINFO) BmpInfo, pBits))
{
TRACE0("Failed to set bitmap info\n");
free(pBits);
return FALSE;
}
free(pBits);
return TRUE;
}
// --- In?: lpszFileName - image filename
// --- Out :
// --- Returns : Returns TRUE on success, FALSE otherwise
// --- Effect : Saves the image to file.
BOOL CDIBSectionCE::Save(LPCTSTR lpszFileName)
{
BITMAPFILEHEADER hdr;
LPBITMAPINFOHEADER lpbi = GetBitmapInfoHeader();
if (!lpbi || !lpszFileName)
return FALSE;
CFile file;
if (!file.Open(lpszFileName, CFile::modeWrite|CFile::modeCreate))
return FALSE;
DWORD dwBitmapInfoSize = sizeof(BITMAPINFO) + m_iColorTableSize*sizeof(RGBQUAD);
DWORD dwFileHeaderSize = dwBitmapInfoSize + sizeof(hdr);
// Fill in the fields of the file header
hdr.bfType = DS_BITMAP_FILEMARKER;
hdr.bfSize = dwFileHeaderSize + lpbi->biSizeImage;
hdr.bfReserved1 = 0;
hdr.bfReserved2 = 0;
hdr.bfOffBits = dwFileHeaderSize;
// Write the file header
file.Write(&hdr, sizeof(hdr));
// Write the DIB header
file.Write(lpbi, dwBitmapInfoSize);
// Write DIB bits
file.Write(GetDIBits(), lpbi->biSizeImage);
return TRUE;
}
/
// CDIBSectionCE palette stuff
#ifndef DIBSECTION_NO_PALETTE
// --- In?:
// --- Out :
// --- Returns : TRUE on success
// --- Effect : Creates the palette from the DIBSection's color table. Assumes
// m_iColorTableSize has been set and the DIBsection m_hBitmap created
BOOL CDIBSectionCE::CreatePalette()
{
m_Palette.DeleteObject();
if (!m_hBitmap)
return FALSE;
// Create a 256 color halftone palette if there is no color table in the DIBSection
if (m_iColorTableSize == 0)
return CreateHalftonePalette(m_Palette, 256);
// Get space for the colour entries
RGBQUAD *pRGB = new RGBQUAD[m_iColorTableSize];
if (!pRGB)
return CreateHalftonePalette(m_Palette, m_iColorTableSize);
HDC hDC = ::GetDC(NULL);
if (!hDC)
{
delete [] pRGB;
return FALSE;
}
// Create a memory DC compatible with the current DC
CDC MemDC;
MemDC.CreateCompatibleDC(CDC::FromHandle(hDC));
if (!MemDC.GetSafeHdc())
{
delete [] pRGB;
::ReleaseDC(NULL, hDC);
return CreateHalftonePalette(m_Palette, m_iColorTableSize);
}
::ReleaseDC(NULL, hDC);
HBITMAP hOldBitmap = (HBITMAP) ::SelectObject(MemDC.GetSafeHdc(), m_hBitmap);
if (!hOldBitmap)
{
delete [] pRGB;
return CreateHalftonePalette(m_Palette, m_iColorTableSize);
}
// Get the colours used. WinCE does not support GetDIBColorTable so if you
// are using this on a CE device with palettes, then you need to replace
// the call with code that manually gets the color table from the m_DIBinfo structure.
#ifdef _WIN32_WCE
int nColours = ::CEGetDIBColorTable(MemDC.GetSafeHdc(), 0, m_iColorTableSize, pRGB);
#else
int nColours = ::GetDIBColorTable(MemDC.GetSafeHdc(), 0, m_iColorTableSize, pRGB);
#endif
// Clean up
::SelectObject(MemDC.GetSafeHdc(), hOldBitmap);
if (!nColours) // No colours retrieved => the bitmap in the DC is not a DIB section
{
delete [] pRGB;
return CreateHalftonePalette(m_Palette, m_iColorTableSize);
}
// Create and fill a LOGPALETTE structure with the colours used.
PALETTEINFO PaletteInfo;
PaletteInfo.palNumEntries = (WORD) m_iColorTableSize;
int i=0;
for (i = 0; i < nColours; i++)
{
PaletteInfo.palPalEntry[i].peRed = pRGB[i].rgbRed;
PaletteInfo.palPalEntry[i].peGreen = pRGB[i].rgbGreen;
PaletteInfo.palPalEntry[i].peBlue = pRGB[i].rgbBlue;
PaletteInfo.palPalEntry[i].peFlags = 0;
}
for (; i < (int) m_iColorTableSize; i++)
{
PaletteInfo.palPalEntry[i].peRed = 0;
PaletteInfo.palPalEntry[i].peGreen = 0;
PaletteInfo.palPalEntry[i].peBlue = 0;
PaletteInfo.palPalEntry[i].peFlags = 0;
}
delete [] pRGB;
// Create Palette!
return m_Palette.CreatePalette(&PaletteInfo);
}
// --- In?: pPalette - new palette to use
// --- Out :
// --- Returns : TRUE on success
// --- Effect : Sets the current palette used by the image from the supplied CPalette,
// and sets the color table in the DIBSection
BOOL CDIBSectionCE::SetPalette(CPalette* pPalette)
{
m_Palette.DeleteObject();
if (!pPalette)
return FALSE;
UINT nColours = pPalette->GetEntryCount();
if (nColours <= 0 || nColours > 256)
return FALSE;
// Get palette entries
PALETTEINFO pi;
pi.palNumEntries = (WORD) pPalette->GetPaletteEntries(0, nColours, (LPPALETTEENTRY) pi);
// TODO: If pi.palNumEntries < m_iColorTableSize, then fill in blanks with 0's
return SetLogPalette(&pi);
}
// --- In?: pLogPalette - new palette to use
// --- Out :
// --- Returns : TRUE on success
// --- Effect : Sets the current palette used by the image from the supplied LOGPALETTE
BOOL CDIBSectionCE::SetLogPalette(LOGPALETTE* pLogPalette)
{
ASSERT(pLogPalette->palVersion == (WORD) 0x300);
UINT nColours = pLogPalette->palNumEntries;
if (nColours <= 0 || nColours > 256)
{
CreatePalette();
return FALSE;
}
// Create new palette
m_Palette.DeleteObject();
if (!m_Palette.CreatePalette(pLogPalette))
{
CreatePalette();
return FALSE;
}
if (m_iColorTableSize == 0)
return TRUE;
// Set the DIB colours
RGBQUAD RGBquads[256];
for (UINT i = 0; i < nColours; i++)
{
RGBquads[i].rgbRed = pLogPalette->palPalEntry[i].peRed;
RGBquads[i].rgbGreen = pLogPalette->palPalEntry[i].peGreen;
RGBquads[i].rgbBlue = pLogPalette->palPalEntry[i].peBlue;
RGBquads[i].rgbReserved = 0;
}
return FillDIBColorTable(nColours, RGBquads);
}
// --- In?: nNumColours - number of colours to set
// pRGB - colours to fill
// --- Out :
// --- Returns : Returns TRUE on success
// --- Effect : Sets the colours used by the image. Only works if # colours <= 256
BOOL CDIBSectionCE::FillDIBColorTable(UINT nNumColours, RGBQUAD *pRGB)
{
if (!pRGB || !nNumColours || !m_iColorTableSize || nNumColours > 256)
return FALSE;
// get the number of colors to return per BITMAPINFOHEADER docs
UINT nColors;
LPBITMAPINFOHEADER pBmih = GetBitmapInfoHeader();
if (pBmih->biClrUsed)
nColors = pBmih->biClrUsed;
else
nColors = 1 << (pBmih->biBitCount*pBmih->biPlanes);
// Initialize the loop variables
nColors = min(nNumColours, nColors);
LPRGBQUAD pColorTable = GetColorTable();
for (UINT iColor = 0; iColor < nColors; iColor++)
{
pColorTable[iColor].rgbReserved = 0;
pColorTable[iColor].rgbBlue = pRGB[iColor].rgbBlue;
pColorTable[iColor].rgbRed = pRGB[iColor].rgbRed;
pColorTable[iColor].rgbGreen = pRGB[iColor].rgbGreen;
}
return TRUE;
}
#endif // DIBSECTION_NO_PALETTE
// --- In?: hdc - the Device Context in which the DIBSection is selected
// hBitmap - the bitmap whose solor entries are to be queried
// lpbi - a pointer to a BITMAPINFO structure that will have it's
// color table filled.
// --- Out :
// --- Returns : the number of colors placed in the color table
// --- Effect : This function is a replacement for GetDIBits, in that it retrieves
// (or synthesizes) the color table from the given bitmap, and stores
// the values in the BITMAPINFO structure supplied.
UINT CDIBSectionCE::GetColorTableEntries(HDC hdc, HBITMAP hBitmap)
{
UINT nColorTableSize = m_iColorTableSize;
if (!nColorTableSize)
return 0;
// Fill the color table with the colours from the bitmap's color table
LPRGBQUAD pColorTable = GetColorTable();
// Get the color table from the HBITMAP and copy them over.
UINT nCount;
RGBQUAD* pRGB = new RGBQUAD[nColorTableSize];
if (pRGB)
{
HBITMAP hOldBitmap = (HBITMAP) SelectObject(hdc, hBitmap);
nCount = CEGetDIBColorTable(hdc, 0, nColorTableSize, pRGB);
SelectObject(hdc, hOldBitmap);
if (nCount)
{
nColorTableSize = nCount;
memcpy(pColorTable, pRGB, nCount*sizeof(RGBQUAD));
}
}
delete [] pRGB;
// Didn't work - so synthesize one.
if (!nCount)
{
int nNumStandardColours = sizeof(ms_StdColours) / sizeof(ms_StdColours[0]);
UINT nIndex = 0;
int i = 0;
// The standard colours (16)
for (i = 0; i < nNumStandardColours; i++)
{
if (nIndex >= nColorTableSize)
break;
memcpy( &(pColorTable[i]), &(ms_StdColours[i]), sizeof(RGBQUAD) );
nIndex++;
}
// A colour cube (6 divisions = 216)
for (int blue = 0; blue <= 5; blue++)
for (int green = 0; green <= 5; green++)
for (int red = 0; red <= 5; red++)
{
if (nIndex >= nColorTableSize)
break;
pColorTable[i].rgbRed = (BYTE) ((red*255)/5);
pColorTable[i].rgbGreen = (BYTE) ((green*255)/5);
pColorTable[i].rgbBlue = (BYTE) ((blue*255)/5);
pColorTable[i].rgbReserved = 0;
nIndex++;
}
// A grey scale (24 divisions)
for (int grey = 0; grey <= 23; grey++)
{
if (nIndex >= nColorTableSize)
break;
pColorTable[i].rgbRed = (BYTE) (grey*255/23);
pColorTable[i].rgbGreen = (BYTE) (grey*255/23);
pColorTable[i].rgbBlue = (BYTE) (grey*255/23);
pColorTable[i].rgbReserved = 0;
nIndex++;
}
}
return nColorTableSize;
}
/**********************************************************************
This function is from the MS KB article "HOWTO: Get the Color Table of
a DIBSection in Windows CE".
PARAMETERS:
HDC - the Device Context in which the DIBSection is selected
UINT - the index of the first color table entry to retrieve
UINT - the number of color table entries to retrieve
RGBQUAD - a buffer large enough to hold the number of RGBQUAD
entries requested
RETURNS:
UINT - the number of colors placed in the buffer
***********************************************************************/
UINT CEGetDIBColorTable(HDC hdc, UINT uStartIndex, UINT cEntries,
RGBQUAD *pColors)
{
if (pColors == NULL)
return 0; // No place to put them, fail
// Get a description of the DIB Section
HBITMAP hDIBSection = (HBITMAP) GetCurrentObject( hdc, OBJ_BITMAP );
DIBSECTION ds;
DWORD dwSize = GetObject( hDIBSection, sizeof(DIBSECTION), &ds );
if (dwSize != sizeof(DIBSECTION))
return 0; // Must not be a DIBSection, fail
if (ds.dsBmih.biBitCount > 8)
return 0; // Not Palettized, fail
// get the number of colors to return per BITMAPINFOHEADER docs
UINT cColors;
if (ds.dsBmih.biClrUsed)
cColors = ds.dsBmih.biClrUsed;
else
cColors = 1 << (ds.dsBmih.biBitCount*ds.dsBmih.biPlanes);
// Create a mask for the palette index bits for 1, 2, 4, and 8 bpp
WORD wIndexMask = (0xFF << (8 - ds.dsBmih.biBitCount)) & 0x00FF;
// Get the pointer to the image bits
LPBYTE pBits = (LPBYTE) ds.dsBm.bmBits;
// Initialize the loop variables
cColors = min( cColors, cEntries );
BYTE OldPalIndex = *pBits;
UINT TestPixelY;
if (ds.dsBmih.biHeight > 0 )
// If button up DIB, pBits points to last row
TestPixelY = ds.dsBm.bmHeight-1;
else
// If top down DIB, pBits points to first row
TestPixelY = 0;
for (UINT iColor = uStartIndex; iColor < cColors; iColor++)
{
COLORREF rgbColor;
// Set the palette index for the test pixel,
// modifying only the bits for one pixel
*pBits = (iColor << (8 - ds.dsBmih.biBitCount)) |
(*pBits & ~wIndexMask);
// now get the resulting color
rgbColor = GetPixel( hdc, 0, TestPixelY );
pColors[iColor - uStartIndex].rgbReserved = 0;
pColors[iColor - uStartIndex].rgbBlue = GetBValue(rgbColor);
pColors[iColor - uStartIndex].rgbRed = GetRValue(rgbColor);
pColors[iColor - uStartIndex].rgbGreen = GetGValue(rgbColor);
}
// Restore the test pixel
*pBits = OldPalIndex;
return cColors;
}
// --- In?: pDC - device context to use when calling CreateCompatibleDC
// bSelectPalette - if TRUE, the current palette will be preselected
// --- Out :
// --- Returns : A pointer to a memory DC
// --- Effect : Creates a memory DC and selects in the current bitmap so it can be
// modified using the GDI functions. Only one memDC can be created for
// a given CDIBSectionCE object. If you have a memDC but wish to recreate it
// as compatible with a different DC, then call ReleaseMemoryDC first.
// If the memory DC has already been created then it will be recycled.
// Note that if using this in an environment where the colour depth of
// the screen may change, then you will need to set "m_bReuseMemDC" to FALSE
CDC* CDIBSectionCE::GetMemoryDC(CDC* pDC /*=NULL*/, BOOL bSelectPalette /*=TRUE*/)
{
if (!m_bReuseMemDC)
ReleaseMemoryDC(TRUE);
else if (m_MemDC.GetSafeHdc()) // Already created?
{
#ifndef _WIN32_WCE
// Flush the GDI batch queue
GdiFlush();
#endif
return &m_MemDC;
}
// Create a memory DC compatible with the given DC
if (pDC)
m_MemDC.CreateCompatibleDC(pDC);
else
{
HDC hDC = ::GetDC(NULL); // screen DC
if (!hDC) return FALSE;
m_MemDC.CreateCompatibleDC(CDC::FromHandle(hDC));
::ReleaseDC(NULL, hDC);
}
if (!m_MemDC.GetSafeHdc())
return NULL;
// Select in the bitmap
m_hOldBitmap = (HBITMAP) ::SelectObject(m_MemDC.GetSafeHdc(), m_hBitmap);
if (!m_hOldBitmap)
{
m_MemDC.DeleteDC();
return NULL;
}
#ifndef DIBSECTION_NO_PALETTE
// Select in the palette
if (bSelectPalette && UsesPalette(&m_MemDC))
{
// Palette should already have been created - but just in case...
if (!m_Palette.GetSafeHandle())
CreatePalette();
m_pOldPalette = m_MemDC.SelectPalette(&m_Palette, FALSE);
m_MemDC.RealizePalette();
}
else
m_pOldPalette = NULL;
#endif // DIBSECTION_NO_PALETTE
#ifndef _WIN32_WCE
// Flush the GDI batch queue
GdiFlush();
#endif // _WIN32_WCE
return &m_MemDC;
}
// --- In?: bForceRelease - if TRUE, then the memory DC is forcibly released
// --- Out :
// --- Returns : TRUE on success
// --- Effect : Selects out the current bitmap and deletes the mem dc. If bForceRelease
// is FALSE, then the DC release will not actually occur. This is provided
// so you can have
//
// GetMemoryDC(...)
// ... do something
// ReleaseMemoryDC()
//
// bracketed calls. If m_bReuseMemDC is subsequently set to FALSE, then
// the same code fragment will still work.
BOOL CDIBSectionCE::ReleaseMemoryDC(BOOL bForceRelease /*=FALSE*/)
{
if ( !m_MemDC.GetSafeHdc() || (m_bReuseMemDC && !bForceRelease) )
return TRUE; // Nothing to do
#ifndef _WIN32_WCE
// Flush the GDI batch queue
GdiFlush();
#endif // _WIN32_WCE
// Select out the current bitmap
if (m_hOldBitmap)
::SelectObject(m_MemDC.GetSafeHdc(), m_hOldBitmap);
m_hOldBitmap = NULL;
#ifndef DIBSECTION_NO_PALETTE
// Select out the current palette
if (m_pOldPalette)
m_MemDC.SelectPalette(m_pOldPalette, FALSE);
m_pOldPalette = NULL;
#endif // DIBSECTION_NO_PALETTE
// Delete the memory DC
return m_MemDC.DeleteDC();
}
#ifdef _DEBUG
// Makes trace windows a little bit more informative...
void CDIBSectionCE::_ShowLastError()
{
LPVOID lpMsgBuf;
FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
NULL, GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR) &lpMsgBuf, 0, NULL);
TRACE1("Last error: %s\n", lpMsgBuf);
LocalFree(lpMsgBuf);
}
#else
void CDIBSectionCE::_ShowLastError() {}
#endif