16.4.1自定义的 DIBSTRUCT结构体
|
字段 |
含义 |
|
PBYTE *ppRow |
①指向位图视觉上最上面的一行像素。（不管是自下而上，还是自上而下） ②放在第一个字段，为的是后面定义宏时可方便访问到 |
|
int iSignature |
=“Dib ”，是这个结构体的标志 |
|
HBITMAP hBitmap |
存储了由CreateDIBSection返回的位图句柄（注意，实质是DIB，但兼有DDB的特点，可直接BitBlt） |
|
BYTE *pBits |
指向像素阵列的指针，其指针值在CreateDIBSection中设定，而所指向的内存由操作系统管理，删除位图句柄后会自动释放。 |
|
DIBSECTION |
在DibCreateFromInfo中调用GetObject来填充该结构体，以方便使用（注意DibCreateFromInfo函数被本例所有创建DIB的函数所调用）。 |
|
int iRShift[3] |
是个数组，3个元素分别为R、G、B颜色遮罩需右移的位数 |
|
int iLShift[3] |
是个数组，3个元素分别为R、G、B颜色遮罩需左移的位数 |
16.4.2 信息获取函数
（1）DibIsValid函数——用来确保DIBSTRUCT结构的有效性
（2）DibIsAddressable（也可定义为DibIsNotCompression）：判断位图是否被压缩
（3）DibInfoHeaderSize等一组函数用于获取DIB区块各部分大小，这些函数可用来将一个DIB Section转换为紧凑DIB。
（4）获得各类指针的函数：如DibInfoHeaderPtr(获取BITMAPINFOHEADER指针)
16.4.3 读写像素信息
（1）DibPixelPtr：用来获取像素的内存指针。注意DIBSTRUCT结构的ppRow是一个指向从上向下排列的DIB像素行的指针，即ppRow[0]是位图视觉上的最上面的一行。如果位图被压缩时返回NULL。
（2）DibGetColor和DibSetColor：像素点在颜色表的值。对于1、4、8位，其RGB值就是要通过颜色表来查找。（对于16、24、32位的，不能通过这两个函数获取，其RGB值要通过掩码和位移获得）
16.4.4 创建和转换
（1）DibCreateFromInfo函数：是DIBHELP库中唯一一个调用CreateDIBSection并为DIBSTRUCT分配内存的函数。其他所有创建或复制都要通过调用该函数来完成。
①参数：BITMAPINFO结构的指针
②该函数调用CreateDIBSeciton后会初始化DIBSTRUCT的所有字段，第一个字段ppRow总是指向DIB的最上面的一行。
（2）DibDelete用来删除由DibCreateFromInfo创建的位图，并释放内存。
（3）DibCopyToPackedDib和DibCopyFromPackedDib常用于应用程序与剪贴板交换DIB
（4）DibCopyToDdb：从一个DIB创建一个GDI位图对象。
16.4.5 宏——快速读写像素位的宏（在DIBHELP.H头文件中）
16.4.6 Dibble程序
（1）三个重要的静态变量hdib、hPalette、hBitmap
（2）WM_USER_SETSCROLL和WM_USER_CREATEPAL消息：用来重置滚动条和创建调色板
（3）DisplayDib：显示位图，提供正常、居中、满拉到客户区、各向同性等4种方式。
①WM_PAINT消息中：位图句柄来自于DibCopyToDdb函数。（因可能要用调色板来显示）
②打印时：从DitbitmapHandle得到DIB Section位图的句柄。
（4）剪贴板：调用DibCopyToPackedDib和DibCopyFromPackedDib函数
（5）Flip函数——上下翻转；Rotate——顺时针转90度。
①DibFlipHorizontal函数：演示通过DibGetPixel和DibSetPixel，效率较低
②DibRotateRight函数：通过DIBHELP.H中定义的宏来读写像素，效率高。
16.4.7 简单的调色板和优化的调色板——在256色的视频模式下，可选择不同调色板
（1）创建调色板的函数
①半色调调色板——系统API提供的。会使用万能调色板与抖动技术来实现该调色板。
②DibPalDibTable：根据DIB颜色表来创建调色板
③DibPalAllPurpose：创建通用的调色板，其颜色见DibPal.C文件
④DibPalUniformGrays：创建一个只有灰度色阶的调色板
（2）优化调色板
①均匀分布算法：DibPalUniformColors——创建iNumR×iNumG×iNumB调色板，一般8级红色、8级绿色和4级蓝色，因为人眼为蓝色比较不敏感。
②流行度算法——DibPalPopularity函数
A、使用位图中被使用最多的256种RGB色值来构成调色板。但24位RGB，可表示2^24种颜色，如果每种颜色用1个int型保存使用次数的话，共需要64M左右，内存消耗大。
B、解决办法是只用RGB权重最高的几位，如用6位而非8位表示R值（因为显示器的解析度也是6位）。这样只需1M，而5位时只需32768字节。
③中分算法——DibPalMedianCut（PaulHeckbert发明）
A、中分算法中RGB值被映射到一个三维坐标中，三个坐标轴分别表示R、G、B
B、每个像素点的RGB值都能在这个坐标系中找到相应的点
C、找到一个能包含所有图像像素的长方体，取最长的一条边，将长方体分成两部分，使划分后的每个部分含有相同的像素数量。
D、然后对这两个盒子做同样的划分，这样2个分为4个、4个分为8个，8个分为16个，然后是32个，64个、128个、256个。
E、现在得到256个盒子，每个都包含了相等的像素数。对每个盒子的颜色取其平均值，并利用这个结构来改变调色板。
16.4.8 格式转换——参考DIbConv.c文件
（1）GetNearestPaletteIndex返回获得调色板中最接近的颜色的索引值
UINT GetNearestPaletteIndex
(
HPALETTE hpal, // 逻辑调色板
COLORREF crColor // 要匹配的颜色
）
（2）DibPalVga：获取标准16色显示器颜色值
（3）HDIBDibConvert(HDIB hdibSrc, int iBitCountDst);用来进行格式转换的函数
【Dibble程序】
效果图
//Dibble.c主程序
/*------------------------------------------------------------
DIBBLE.C -- Bitmap and Palette Program
(c) Charles Petzold, 1998
------------------------------------------------------------*/
#include <windows.h>
#include "resource.h"
#include "DibHelp.h"
#include "DibConv.h"
#include "DibPal.h"
#define WM_USER_SETSCROLLS (WM_USER + 1)
#define WM_USER_DELETEDIB (WM_USER + 2)
#define WM_USER_DELETEPAL (WM_USER + 3)
#define WM_USER_CREATEPAL (WM_USER + 4)
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
static TCHAR szAppName[] = TEXT("Dibble");
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
HWND hwnd;
MSG msg;
WNDCLASSEX wndclass;
HACCEL hAccel;
wndclass.style = CS_HREDRAW | CS_VREDRAW;
wndclass.cbSize = sizeof(WNDCLASSEX);
wndclass.lpfnWndProc = WndProc;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = hInstance;
wndclass.hIcon = LoadIcon(hInstance, szAppName);
wndclass.hIconSm = LoadIcon(hInstance, szAppName);
wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
wndclass.lpszMenuName = szAppName;
wndclass.lpszClassName = szAppName;
if (!RegisterClassEx(&wndclass))
{
MessageBox(NULL, TEXT("This program requires Windows NT!"),
szAppName, MB_ICONERROR);
return 0;
}
hwnd = CreateWindow(szAppName, // window class name
szAppName, // window caption
WS_OVERLAPPEDWINDOW | WS_VSCROLL | WS_HSCROLL, // window style
CW_USEDEFAULT, // initial x position
CW_USEDEFAULT, // initial y position
CW_USEDEFAULT, // initial x size
CW_USEDEFAULT, // initial y size
NULL, // parent window handle
NULL, // window menu handle
hInstance, // program instance handle
NULL); // creation parameters
ShowWindow(hwnd, iCmdShow);
UpdateWindow(hwnd);
hAccel = LoadAccelerators(hInstance, szAppName);
while (GetMessage(&msg, NULL, 0, 0))
{
if (!TranslateAccelerator(hwnd, hAccel, &msg))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
return msg.wParam;
}
/*-------------------------------------------------------------------------------
DisplayDib:根据菜单项的选择来显示（打印）DIB的实际大小图像或缩放的图像
--------------------------------------------------------------------------------*/
int DisplayDib(HDC hdc, HBITMAP hBitmap, int x, int y,
int cxClient, int cyClient,
WORD wShow, BOOL fHalftonePalette)
{
BITMAP bitmap;
HDC hdcMem;
int cxBitmap, cyBitmap, iReturn;
GetObject(hBitmap, sizeof(BITMAP), &bitmap);
cxBitmap = bitmap.bmWidth;
cyBitmap = bitmap.bmHeight;
SaveDC(hdc);
if (fHalftonePalette)
SetStretchBltMode(hdc, HALFTONE);
else
SetStretchBltMode(hdc, COLORONCOLOR);
hdcMem = CreateCompatibleDC(hdc);
SelectObject(hdcMem, hBitmap);
switch (wShow)
{
case IDM_SHOW_NORMAL:
if (fHalftonePalette)
{
iReturn = StretchBlt(hdc, 0, 0,
min(cxClient, cxBitmap - x),
min(cyClient, cyBitmap - y),
hdcMem, x, y,
min(cxClient, cxBitmap - x),
min(cyClient, cyBitmap - y),
SRCCOPY);
} else
{
iReturn = BitBlt(hdc, 0, 0,
min(cxClient, cxBitmap - x),
min(cyClient, cyBitmap - y),
hdcMem, x, y, SRCCOPY);
}
break;
case IDM_SHOW_CENTER:
if (fHalftonePalette)
{
iReturn = StretchBlt(hdc, (cxClient - cxBitmap) / 2, (cyClient - cyBitmap) / 2,
cxBitmap, cyBitmap,
hdcMem, 0, 0,
cxBitmap, cyBitmap,
SRCCOPY);
} else
{
iReturn = BitBlt(hdc, (cxClient - cxBitmap) / 2, (cyClient - cyBitmap) / 2,
cxBitmap, cyBitmap,
hdcMem, 0, 0, SRCCOPY);
}
break;
case IDM_SHOW_STRETCH:
iReturn = StretchBlt(hdc, 0, 0,
cxClient, cyClient,
hdcMem, 0, 0,
cxBitmap, cyBitmap,
SRCCOPY);
break;
case IDM_SHOW_ISOSTRETCH:
SetMapMode(hdc, MM_ISOTROPIC);
SetWindowExtEx(hdc, cxBitmap, cyBitmap, NULL);
SetViewportExtEx(hdc, cxClient, cyClient, NULL);
SetWindowOrgEx(hdc, cxBitmap / 2, cyBitmap / 2, NULL);
SetViewportOrgEx(hdc, cxClient / 2, cyClient / 2, NULL);
//iReturn = StretchBlt(hdc, 0, 0,
// cxBitmap, cyBitmap,
// hdcMem, 0, 0,
// cxBitmap, cyBitmap,
// SRCCOPY);
iReturn = BitBlt(hdc, 0, 0,
cxBitmap, cyBitmap,
hdcMem, 0, 0,
SRCCOPY);
break;
}
DeleteDC(hdcMem);
RestoreDC(hdc, -1);
return iReturn;
}
/*-------------------------------------------------------------------------------
PaletteMenu:设置“Palette”各菜单项的Check属性
--------------------------------------------------------------------------------*/
void PaletteMenu(HMENU hMenu, WORD wItemNew)
{
static WORD wItem = IDM_PAL_NONE;
CheckMenuItem(hMenu, wItem, MF_UNCHECKED);
wItem = wItemNew;
CheckMenuItem(hMenu, wItem, MF_CHECKED);
}
LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static OPENFILENAME ofn;
static TCHAR szFileName[MAX_PATH], szTitleName[MAX_PATH];
static TCHAR szFilter[] = TEXT("Bitmap Files (*.BMP)\0*.bmp\0")
TEXT("All Files (*.*)\0*.*\0\0");
static TCHAR* szCompression[] = {
TEXT("BI_RGB"), TEXT("BI_RLE8"),
TEXT("BI_RLE4"), TEXT("BI_BITFIELDS"),
TEXT("Unknown") };
static HDIB hdib;
static HPALETTE hPalette;
static HBITMAP hBitmap;
static BOOL fHalftonePalette;
static HMENU hMenu;
BOOL fSuccess;
static int cxClient, cyClient, iHscroll, iVscroll;
static WORD wShow = IDM_SHOW_NORMAL;
static PRINTDLG printdlg = { sizeof(PRINTDLG) };
static DOCINFO di = { sizeof(DOCINFO), TEXT("Dibble：Printing") };
int cxPage, cyPage;
HDC hdc, hdcPrn;
HGLOBAL hGlobal;
BYTE* pGlobal;
HDIB hdibNew;
PAINTSTRUCT ps;
SCROLLINFO si;
int iEnable, iConvert = 0;
TCHAR szBuffer[256];
switch (message)
{
case WM_CREATE:
//将菜单句柄保存在静态变量hMenu中
hMenu = GetMenu(hwnd);
//初始化打开文件对话框
memset(&ofn, 0, sizeof(OPENFILENAME));
ofn.lStructSize = sizeof(OPENFILENAME);
ofn.hwndOwner = hwnd;
ofn.lpstrFilter = szFilter;
ofn.lpstrFile = szFileName;
ofn.nMaxFile = MAX_PATH;
ofn.lpstrFileTitle = szTitleName;
ofn.nMaxFileTitle = MAX_PATH;
ofn.Flags = OFN_OVERWRITEPROMPT;
ofn.lpstrDefExt = TEXT("bmp");
return 0;
case WM_SIZE:
cxClient = LOWORD(lParam);
cyClient = HIWORD(lParam);
wParam = FALSE; //贯穿功能，继续执行下面的代码
//用户自定义消息，设置滚动条，如果显示模式是正常模式，则隐藏滚动条。如果
//wParam==TRUE，则复位滚动条的位置
case WM_USER_SETSCROLLS:
if (hdib == NULL || wShow != IDM_SHOW_NORMAL)
{
si.cbSize = sizeof(SCROLLINFO);
si.fMask = SIF_RANGE;
si.nMin = 0;
si.nMax = 0;
SetScrollInfo(hwnd, SB_VERT, &si, TRUE); //隐藏
SetScrollInfo(hwnd, SB_HORZ, &si, TRUE);
} else
{
//垂直滚动条
si.cbSize = sizeof(SCROLLINFO);
si.fMask = SIF_ALL;
GetScrollInfo(hwnd, SB_VERT, &si);
si.nMin = 0;
si.nMax = DibHeight(hdib);
si.nPage = cyClient;
if ((BOOL)wParam) //恢复到0的默认位置
si.nPos = 0;
SetScrollInfo(hwnd, SB_VERT, &si, TRUE);
GetScrollInfo(hwnd, SB_VERT, &si);
iVscroll = si.nPos;
//水平滚动条
GetScrollInfo(hwnd, SB_HORZ, &si);
si.nMin = 0;
si.nMax = DibWidth(hdib);
si.nPage = cxClient;
if ((BOOL)wParam) //恢复到0的默认位置
si.nPos = 0;
SetScrollInfo(hwnd, SB_HORZ, &si, TRUE);
GetScrollInfo(hwnd, SB_HORZ, &si);
iHscroll = si.nPos;
}
return 0;
case WM_VSCROLL:
si.cbSize = sizeof(SCROLLINFO);
si.fMask = SIF_ALL;
GetScrollInfo(hwnd, SB_VERT, &si);
iVscroll = si.nPos;
switch (LOWORD(wParam))
{
case SB_LINEUP: si.nPos -= 1; break;
case SB_LINEDOWN: si.nPos += 1; break;
case SB_PAGEUP: si.nPage -= si.nPage; break;
case SB_PAGEDOWN: si.nPage += si.nPage; break;
case SB_THUMBTRACK: si.nPos = si.nTrackPos; break;
default: break;
}
si.fMask = SIF_POS;
SetScrollInfo(hwnd, SB_VERT, &si, TRUE);
GetScrollInfo(hwnd, SB_VERT, &si);
if (si.nPos != iVscroll)
{
ScrollWindow(hwnd, 0, iVscroll - si.nPos, NULL, NULL);
iVscroll = si.nPos;
UpdateWindow(hwnd); //立即更新窗口，这行可以注释掉
}
return 0;
case WM_HSCROLL:
si.cbSize = sizeof(SCROLLINFO);
si.fMask = SIF_ALL;
GetScrollInfo(hwnd, SB_HORZ, &si);
iHscroll = si.nPos;
switch (LOWORD(wParam))
{
case SB_LINELEFT: si.nPos -= 1; break;
case SB_LINERIGHT: si.nPos += 1; break;
case SB_PAGELEFT: si.nPage -= si.nPage; break;
case SB_PAGERIGHT: si.nPage += si.nPage; break;
case SB_THUMBTRACK: si.nPos = si.nTrackPos; break;
default: break;
}
si.fMask = SIF_POS;
SetScrollInfo(hwnd, SB_HORZ, &si, TRUE);
GetScrollInfo(hwnd, SB_HORZ, &si);
if (si.nPos != iHscroll)
{
ScrollWindow(hwnd, iHscroll - si.nPos, 0, NULL, NULL);
iHscroll = si.nPos;
UpdateWindow(hwnd); //立即更新窗口，这行可以注释掉
}
return 0;
case WM_INITMENUPOPUP:
if (hdib)
iEnable = MF_ENABLED;
else
iEnable = MF_GRAYED;
EnableMenuItem(hMenu, IDM_FILE_SAVE, iEnable);
EnableMenuItem(hMenu, IDM_FILE_PRINT, iEnable);
EnableMenuItem(hMenu, IDM_FILE_PROPERTIES, iEnable);
EnableMenuItem(hMenu, IDM_EDIT_CUT, iEnable);
EnableMenuItem(hMenu, IDM_EDIT_COPY, iEnable);
EnableMenuItem(hMenu, IDM_EDIT_DELETE, iEnable);
if (DibIsAddressable(hdib))
iEnable = MF_ENABLED;
else
iEnable = MF_GRAYED;
EnableMenuItem(hMenu, IDM_EDIT_ROTATE, iEnable);
EnableMenuItem(hMenu, IDM_EDIT_FLIP, iEnable);
EnableMenuItem(hMenu, IDM_CONVERT_01, iEnable);
EnableMenuItem(hMenu, IDM_CONVERT_04, iEnable);
EnableMenuItem(hMenu, IDM_CONVERT_08, iEnable);
EnableMenuItem(hMenu, IDM_CONVERT_16, iEnable);
EnableMenuItem(hMenu, IDM_CONVERT_24, iEnable);
EnableMenuItem(hMenu, IDM_CONVERT_32, iEnable);
switch (DibBitCount(hdib))
{
case 1: EnableMenuItem(hMenu, IDM_CONVERT_01, MF_GRAYED); break;
case 4: EnableMenuItem(hMenu, IDM_CONVERT_04, MF_GRAYED); break;
case 8: EnableMenuItem(hMenu, IDM_CONVERT_08, MF_GRAYED); break;
case 16: EnableMenuItem(hMenu, IDM_CONVERT_16, MF_GRAYED); break;
case 24: EnableMenuItem(hMenu, IDM_CONVERT_24, MF_GRAYED); break;
case 32: EnableMenuItem(hMenu, IDM_CONVERT_32, MF_GRAYED); break;
}
if (hdib && DibColorSize(hdib) > 0)
iEnable = MF_ENABLED;
else
iEnable = MF_GRAYED;
EnableMenuItem(hMenu, IDM_PAL_DIBTABLE, iEnable);
if (DibIsAddressable(hdib) && DibBitCount(hdib)>8)
iEnable = MF_ENABLED;
else
iEnable = MF_GRAYED;
EnableMenuItem(hMenu, IDM_PAL_OPT_POP4, iEnable);
EnableMenuItem(hMenu, IDM_PAL_OPT_POP5, iEnable);
EnableMenuItem(hMenu, IDM_PAL_OPT_POP6, iEnable);
EnableMenuItem(hMenu, IDM_PAL_OPT_MEDCUT, iEnable);
EnableMenuItem(hMenu, IDM_EDIT_PASTE, IsClipboardFormatAvailable(CF_DIB) ? MF_ENABLED : MF_GRAYED);
return 0;
case WM_COMMAND:
switch (LOWORD(wParam))
{
case IDM_FILE_OPEN:
//显示“打开文件”对话框
if (!GetOpenFileName(&ofn))
return 0;
//如果DIB和调色板己经存在，则删除它们
SendMessage(hwnd, WM_USER_DELETEDIB, 0, 0);
//加载DIB文件到内存
SetCursor(LoadCursor(NULL, IDC_WAIT));
ShowCursor(TRUE);
hdib = DibFileLoad(szFileName);
SetCursor(LoadCursor(NULL, IDC_ARROW));
ShowCursor(FALSE);
//重置滚动条
SendMessage(hwnd, WM_USER_SETSCROLLS, TRUE, 0);
//创建调色板和DDB
SendMessage(hwnd, WM_USER_CREATEPAL, TRUE, 0); //根据调色板，创建DDB——hBitmap
if (!hdib)
{
MessageBox(hwnd, TEXT("Cannot load DIB file!"),
szAppName, MB_OK | MB_ICONEXCLAMATION);
}
InvalidateRect(hwnd, NULL, TRUE);
return 0;
case IDM_FILE_SAVE:
//打开“保存”对话框
if (!GetSaveFileName(&ofn))
return 0;
//将DIB保存到文件中
SetCursor(LoadCursor(NULL, IDC_WAIT));
ShowCursor(TRUE);
fSuccess = DibFileSave(hdib, szFileName);
SetCursor(LoadCursor(NULL, IDC_ARROW));
ShowCursor(FALSE);
if (!fSuccess)
{
MessageBox(hwnd, TEXT("Cannot Save DIB file!"),
szAppName, MB_OK | MB_ICONEXCLAMATION);
}
return 0;
case IDM_FILE_PRINT:
if (!hdib)
return 0;
//获得打印机DC
printdlg.Flags = PD_RETURNDC | PD_NOPAGENUMS | PD_NOSELECTION;
if (!PrintDlg(&printdlg))
return 0;
if (NULL == (hdcPrn = printdlg.hDC))
{
MessageBox(hwnd, TEXT("Cannot obtain Printer DC"), szAppName, MB_ICONEXCLAMATION | MB_OK);
return 0;
}
//检查打印机是否支持打印位图
if (!(RC_BITBLT & GetDeviceCaps(hdcPrn, RASTERCAPS)))
{
DeleteDC(hdcPrn);
MessageBox(hwnd, TEXT("Printer cannot print bitmaps"), szAppName, MB_ICONEXCLAMATION | MB_OK);
return 0;
}
//获取打机印的可打印区域
cxPage = GetDeviceCaps(hdcPrn, HORZRES);
cyPage = GetDeviceCaps(hdcPrn, VERTRES);
fSuccess = FALSE;
//将DIB发送到打印机
SetCursor(LoadCursor(NULL, IDC_WAIT));
ShowCursor(TRUE);
if ((StartDoc(hdcPrn, &di) > 0) && (StartPage(hdcPrn) > 0))
{
DisplayDib(hdcPrn, DibBitmapHandle(hdib), 0, 0, cxPage, cyPage, wShow, FALSE);
if (EndPage(hdcPrn) > 0)
{
fSuccess = TRUE;
EndDoc(hdcPrn);
}
}
ShowCursor(FALSE);
SetCursor(LoadCursor(NULL, IDC_ARROW));
DeleteDC(hdcPrn);
if (!fSuccess)
MessageBox(hwnd, TEXT("Cannot print bitmaps"),
szAppName, MB_ICONEXCLAMATION | MB_OK);
return 0;
case IDM_FILE_PROPERTIES:
if (!hdib)
return 0;
wsprintf(szBuffer, TEXT("Pixel width:\t%i\n") //%i与%d一样的
TEXT("Pixel Height:\t%i\n")
TEXT("Bits per pixel:\t%i\n")
TEXT("Number of colors:\t%i\n")
TEXT("Compression:\t%s\n"),
DibWidth(hdib), DibHeight(hdib),
DibBitCount(hdib), DibNumColors(hdib),
szCompression[min(3, DibCompression(hdib))]);
MessageBox(hwnd, szBuffer, szAppName, MB_ICONEXCLAMATION | MB_OK);
return 0;
case IDM_APP_EXIT:
SendMessage(hwnd, WM_CLOSE, 0, 0);
return 0;
case IDM_EDIT_COPY:
case IDM_EDIT_CUT:
if (!(hGlobal = DibCopyToPackedDib(hdib, TRUE)))
return 0;
OpenClipboard(hwnd);
EmptyClipboard();
SetClipboardData(CF_DIB, hGlobal);
CloseClipboard();
if (LOWORD(wParam) == IDM_EDIT_COPY)
return 0;
//剪切时，继续执行下去
case IDM_EDIT_DELETE:
SendMessage(hwnd, WM_USER_DELETEDIB, 0, 0);
InvalidateRect(hwnd, NULL, TRUE);
return 0;
case IDM_EDIT_PASTE:
OpenClipboard(hwnd);
hGlobal = GetClipboardData(CF_DIB);
pGlobal = GlobalLock(hGlobal);
//如果己经存在DIB位图和调色板，则删除它们
if (pGlobal)
{
SendMessage(hwnd, WM_USER_DELETEDIB, 0, 0);
hdib = DibCopyFromPackedDib((BITMAPINFO*)pGlobal);
SendMessage(hwnd, WM_USER_CREATEPAL, TRUE, 0);
}
GlobalUnlock(hGlobal);
CloseClipboard();
//重置滚动条
SendMessage(hwnd, WM_USER_SETSCROLLS, TRUE, 0);
InvalidateRect(hwnd, NULL, TRUE);
return 0;
case IDM_EDIT_ROTATE:
if (hdibNew = DibRotateRight(hdib))
{
DibDelete(hdib);
DeleteObject(hBitmap);
hdib = hdibNew;
hBitmap = DibCopyToDdb(hdib, hwnd, hPalette);
SendMessage(hwnd, WM_USER_SETSCROLLS, TRUE, 0);
InvalidateRect(hwnd, NULL, TRUE);
} else
{
MessageBox(hwnd, TEXT("Not enough memory"),
szAppName, MB_OK | MB_ICONEXCLAMATION);
}
return 0;
case IDM_EDIT_FLIP:
if (hdibNew = DibFlipHorizontal(hdib))
{
DibDelete(hdib);
DeleteObject(hBitmap);
hdib = hdibNew;
hBitmap = DibCopyToDdb(hdib, hwnd, hPalette);
InvalidateRect(hwnd, NULL, TRUE);
} else
{
MessageBox(hwnd, TEXT("Not enough memory"),
szAppName, MB_OK | MB_ICONEXCLAMATION);
}
return 0;
case IDM_SHOW_NORMAL:
case IDM_SHOW_STRETCH:
case IDM_SHOW_CENTER:
case IDM_SHOW_ISOSTRETCH:
CheckMenuItem(hMenu, wShow, MF_UNCHECKED);
wShow = LOWORD(wParam);
CheckMenuItem(hMenu, wShow, MF_CHECKED);
SendMessage(hwnd, WM_USER_SETSCROLLS, TRUE, 0);
InvalidateRect(hwnd, NULL, TRUE);
return 0;
case IDM_CONVERT_32:iConvert += 8;
case IDM_CONVERT_24:iConvert += 8;
case IDM_CONVERT_16:iConvert += 8;
case IDM_CONVERT_08:iConvert += 4;
case IDM_CONVERT_04:iConvert += 3;
case IDM_CONVERT_01:iConvert += 1;
SetCursor(LoadCursor(NULL, IDC_WAIT));
ShowCursor(TRUE);
hdibNew = DibConvert(hdib, iConvert);
ShowCursor(FALSE);
SetCursor(LoadCursor(NULL, IDC_ARROW));
if (hdibNew)
{
SendMessage(hwnd, WM_USER_DELETEDIB, 0, 0);
hdib = hdibNew;
SendMessage(hwnd, WM_USER_CREATEPAL, TRUE, 0);
InvalidateRect(hwnd, NULL, TRUE);
} else
{
MessageBox(hwnd, TEXT("Not enough memory"),
szAppName, MB_OK | MB_ICONEXCLAMATION);
}
return 0;
case IDM_APP_ABOUT:
MessageBox(hwnd, TEXT("Dibble (c) Charles Petzold,1998"),
szAppName, MB_OK | MB_ICONEXCLAMATION);
return 0;
}
//其余所有的WM_COMMAND消息都是来自调色板项目。如果删除己经存在的调色板，光标将被
//设置为沙漏的形状
SendMessage(hwnd, WM_USER_DELETEPAL, 0, 0);
SetCursor(LoadCursor(NULL, IDC_WAIT));
ShowCursor(TRUE);
//提醒，所有的调色板消息都以break结束而不是return，这允许后面进行一些额外的处理
switch (LOWORD(wParam))
{
case IDM_PAL_DIBTABLE:
hPalette = DibPalDibTable(hdib);
break;
case IDM_PAL_HALFTONE:
hdc = GetDC(hwnd);
if (hPalette = CreateHalftonePalette(hdc))
fHalftonePalette = TRUE;
ReleaseDC(hwnd, hdc);
break;
case IDM_PAL_ALLPURPOSE:
hPalette = DibPalAllPurpose();
break;
case IDM_PAL_GRAY2: hPalette = DibPalUniformGrays(2); break;
case IDM_PAL_GRAY3: hPalette = DibPalUniformGrays(3); break;
case IDM_PAL_GRAY4: hPalette = DibPalUniformGrays(4); break;
case IDM_PAL_GRAY8: hPalette = DibPalUniformGrays(8); break;
case IDM_PAL_GRAY16: hPalette = DibPalUniformGrays(16); break;
case IDM_PAL_GRAY32: hPalette = DibPalUniformGrays(32); break;
case IDM_PAL_GRAY64: hPalette = DibPalUniformGrays(64); break;
case IDM_PAL_GRAY128: hPalette = DibPalUniformGrays(128); break;
case IDM_PAL_GRAY256: hPalette = DibPalUniformGrays(256); break;
case IDM_PAL_RGB222: hPalette = DibPalUniformColors(2, 2, 2); break;
case IDM_PAL_RGB333: hPalette = DibPalUniformColors(3, 3, 3); break;
case IDM_PAL_RGB444: hPalette = DibPalUniformColors(4, 4, 4); break;
case IDM_PAL_RGB555: hPalette = DibPalUniformColors(5, 5, 5); break;
case IDM_PAL_RGB666: hPalette = DibPalUniformColors(6, 6, 6); break;
case IDM_PAL_RGB775: hPalette = DibPalUniformColors(7, 7, 5); break;
case IDM_PAL_RGB757: hPalette = DibPalUniformColors(7, 5, 7); break;
case IDM_PAL_RGB577: hPalette = DibPalUniformColors(5, 7, 7); break;
case IDM_PAL_RGB884: hPalette = DibPalUniformColors(8, 8, 4); break;
case IDM_PAL_RGB848: hPalette = DibPalUniformColors(8, 4, 8); break;
case IDM_PAL_RGB488: hPalette = DibPalUniformColors(4, 8, 8); break;
case IDM_PAL_OPT_POP4:
hPalette = DibPalPopularity(hdib, 4);
break;
case IDM_PAL_OPT_POP5:
hPalette = DibPalPopularity(hdib, 5);
break;
case IDM_PAL_OPT_POP6:
hPalette = DibPalPopularity(hdib, 6);
break;
case IDM_PAL_OPT_MEDCUT:
hPalette = DibPalMedianCut(hdib, 6);
break;
}
//当处理完菜单中的调色板项目后，光标恢复为箭头的形状，该项被设为Checked，并
//且刷新客户区
hBitmap = DibCopyToDdb(hdib, hwnd, hPalette);
ShowCursor(FALSE);
SetCursor(LoadCursor(NULL, IDC_ARROW));
if (hPalette)
PaletteMenu(hMenu, (LOWORD(wParam)));
InvalidateRect(hwnd, NULL, TRUE);
return 0; //WM_COMMAND消息处理完毕
//该消息中删除一个己经存在的DIB，为获取一个新DIB作准备。
//该消息会被打开、粘贴或其它菜单命令所调用
case WM_USER_DELETEDIB:
if (hdib)
{
DibDelete(hdib);
hdib = NULL;
}
SendMessage(hwnd, WM_USER_DELETEPAL, 0, 0);
return 0;
//基于一个新DIB创建一个调色板。如果wParam==TRUE，则同时创建DDB
case WM_USER_CREATEPAL:
if (hdib)
{
hdc = GetDC(hwnd);
if (!(RC_PALETTE & GetDeviceCaps(hdc, RASTERCAPS))) //不支持调色调
{
PaletteMenu(hMenu, IDM_PAL_NONE);
} else if (hPalette = CreateHalftonePalette(hdc)) //创建半色调调色板
{
fHalftonePalette = TRUE;
PaletteMenu(hMenu, IDM_PAL_HALFTONE);
}
ReleaseDC(hwnd, hdc);
if ((BOOL)wParam)
hBitmap = DibCopyToDdb(hdib, hwnd, hPalette);
}
return 0;
//删除一个己经存在的调色板，为创建新调色板做准备
case WM_USER_DELETEPAL:
if (hPalette)
{
DeleteObject(hPalette);
hPalette = NULL;
fHalftonePalette = FALSE;
PaletteMenu(hMenu, IDM_PAL_NONE);
}
if (hBitmap)
{
DeleteObject(hBitmap);
}
return 0;
case WM_PAINT:
hdc = BeginPaint(hwnd, &ps);
if (hPalette)
{
SelectPalette(hdc, hPalette, FALSE);
RealizePalette(hdc);
}
if (hBitmap)
{
DisplayDib(hdc,
fHalftonePalette ? DibBitmapHandle(hdib) : hBitmap,
iHscroll, iVscroll,
cxClient, cyClient,
wShow, fHalftonePalette);
}
EndPaint(hwnd, &ps);
return 0;
case WM_QUERYNEWPALETTE:
if (!hPalette)
return FALSE;
hdc = GetDC(hwnd);
SelectPalette(hdc, hPalette, FALSE);
RealizePalette(hdc);
InvalidateRect(hwnd, NULL, TRUE);
ReleaseDC(hwnd, hdc);
return TRUE;
case WM_PALETTECHANGED:
if (!hPalette || (HWND)wParam == hwnd)
return FALSE;
hdc = GetDC(hwnd);
SelectPalette(hdc, hPalette, FALSE);
RealizePalette(hdc);
UpdateColors(hdc);
ReleaseDC(hwnd, hdc);
break;
case WM_DESTROY:
if (hdib)
DibDelete(hdib);
if (hBitmap)
DeleteObject(hBitmap);
if (hPalette)
DeleteObject(hPalette);
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, message, wParam, lParam);
}
//resource.h
//{{NO_DEPENDENCIES}}
// Microsoft Visual C++ 生成的包含文件。
// 供 Dibble.rc 使用
//
#define IDM_FILE_OPEN 40001
#define IDM_FILE_SAVE 40002
#define IDM_FILE_PRINT 40003
#define IDM_FILE_PROPERTIES 40004
#define IDM_APP_EXIT 40005
#define IDM_EDIT_CUT 40006
#define IDM_EDIT_COPY 40007
#define IDM_EDIT_PASTE 40008
#define IDM_EDIT_DELETE 40009
#define IDM_EDIT_FLIP 40010
#define IDM_EDIT_ROTATE 40011
#define IDM_SHOW_NORMAL 40012
#define IDM_SHOW_CENTER 40013
#define IDM_SHOW_STRETCH 40014
#define IDM_SHOW_ISOSTRETCH 40015
#define IDM_PAL_NONE 40016
#define IDM_PAL_DIBTABLE 40017
#define IDM_PAL_HALFTONE 40018
#define IDM_PAL_ALLPURPOSE 40019
#define IDM_PAL_GRAY2 40020
#define IDM_PAL_GRAY3 40021
#define IDM_PAL_GRAY4 40022
#define IDM_PAL_GRAY8 40023
#define IDM_PAL_GRAY16 40024
#define IDM_PAL_GRAY32 40025
#define IDM_PAL_GRAY64 40026
#define IDM_PAL_GRAY128 40027
#define IDM_PAL_GRAY256 40028
#define IDM_PAL_RGB222 40029
#define IDM_PAL_RGB333 40030
#define IDM_PAL_RGB444 40031
#define IDM_PAL_RGB555 40032
#define IDM_PAL_RGB666 40033
#define IDM_PAL_RGB775 40034
#define IDM_PAL_RGB757 40035
#define IDM_PAL_RGB577 40036
#define IDM_PAL_RGB884 40037
#define IDM_PAL_RGB848 40038
#define IDM_PAL_RGB488 40039
#define IDM_CONVERT_01 40040
#define IDM_CONVERT_04 40041
#define IDM_CONVERT_08 40042
#define IDM_CONVERT_16 40043
#define IDM_CONVERT_24 40044
#define IDM_CONVERT_32 40045
#define IDM_APP_ABOUT 40046
#define IDM_PAL_OPT_POP4 40047
#define IDM_PAL_OPT_POP5 40048
#define IDM_PAL_OPT_POP6 40049
#define IDM_PAL_OPT_MEDCUT 40050
// Next default values for new objects
//
#ifdef APSTUDIO_INVOKED
#ifndef APSTUDIO_READONLY_SYMBOLS
#define _APS_NEXT_RESOURCE_VALUE 103
#define _APS_NEXT_COMMAND_VALUE 40040
#define _APS_NEXT_CONTROL_VALUE 1001
#define _APS_NEXT_SYMED_VALUE 101
#endif
#endif
//Dibble.rc
// Microsoft Visual C++ generated resource script. // #include "resource.h" #define APSTUDIO_READONLY_SYMBOLS ///////////////////////////////////////////////////////////////////////////// // // Generated from the TEXTINCLUDE 2 resource. // #include "winres.h" ///////////////////////////////////////////////////////////////////////////// #undef APSTUDIO_READONLY_SYMBOLS ///////////////////////////////////////////////////////////////////////////// // 中文(简体，中国) resources #if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_CHS) LANGUAGE LANG_CHINESE, SUBLANG_CHINESE_SIMPLIFIED #ifdef APSTUDIO_INVOKED ///////////////////////////////////////////////////////////////////////////// // // TEXTINCLUDE // 1 TEXTINCLUDE BEGIN "resource.h\0" END 2 TEXTINCLUDE BEGIN "#include ""winres.h""\r\n" "\0" END 3 TEXTINCLUDE BEGIN "\r\n" "\0" END #endif // APSTUDIO_INVOKED ///////////////////////////////////////////////////////////////////////////// // // Menu // DIBBLE MENU BEGIN POPUP "&File" BEGIN MENUITEM "&Open...\tCtrl+O", IDM_FILE_OPEN MENUITEM "&Save...\tCtrl+S", IDM_FILE_SAVE MENUITEM SEPARATOR MENUITEM "&Print...\tCtrl+P", IDM_FILE_PRINT MENUITEM SEPARATOR MENUITEM "Propert&ies...", IDM_FILE_PROPERTIES MENUITEM SEPARATOR MENUITEM "E&xit", IDM_APP_EXIT END POPUP "&Edit" BEGIN MENUITEM "Cu&t\tCtrl+X", IDM_EDIT_CUT MENUITEM "&Copy\tCtrl+C", IDM_EDIT_COPY MENUITEM "&Paste\tCtrl+V", IDM_EDIT_PASTE MENUITEM "&Delete\tDelete", IDM_EDIT_DELETE MENUITEM SEPARATOR MENUITEM "&Flip", IDM_EDIT_FLIP MENUITEM "&Rotate", IDM_EDIT_ROTATE END POPUP "&Show" BEGIN MENUITEM "&Actual Size", IDM_SHOW_NORMAL, CHECKED MENUITEM "&Center", IDM_SHOW_CENTER MENUITEM "&Stretch to Window", IDM_SHOW_STRETCH MENUITEM "Stretch &Isotropically", IDM_SHOW_ISOSTRETCH END POPUP "&Palette" BEGIN MENUITEM "&None", IDM_PAL_NONE, CHECKED MENUITEM "&Dib ColorTable", IDM_PAL_DIBTABLE MENUITEM "&Halftone", IDM_PAL_HALFTONE MENUITEM "&All-Purpose", IDM_PAL_ALLPURPOSE POPUP "&Gray Shades" BEGIN MENUITEM "&1. 2 Grays ", IDM_PAL_GRAY2 MENUITEM "&2. 3 Grays", IDM_PAL_GRAY3 MENUITEM "&3. 4 Grays", IDM_PAL_GRAY4 MENUITEM "&4. 8 Grays", IDM_PAL_GRAY8 MENUITEM "&5. 16 Grays", IDM_PAL_GRAY16 MENUITEM "&6. 32 Grays", IDM_PAL_GRAY32 MENUITEM "&7. 64 Grays", IDM_PAL_GRAY64 MENUITEM "&8. 128 Grays", IDM_PAL_GRAY128 MENUITEM "&9. 256 Grays", IDM_PAL_GRAY256 END POPUP "&Uniform Colors" BEGIN MENUITEM "&1. 2R×2G×2B (8)", IDM_PAL_RGB222 MENUITEM "&2. 3R×3G×3B (27)", IDM_PAL_RGB333 MENUITEM "&3. 4R×4G×4B (64)", IDM_PAL_RGB444 MENUITEM "&4. 5R×5G×5B (125)", IDM_PAL_RGB555 MENUITEM "&5. 6R×6G×6B (216)", IDM_PAL_RGB666 MENUITEM "&6. 7R×7G×5B (245)", IDM_PAL_RGB775 MENUITEM "&7. 7R×5G×7B (245)", IDM_PAL_RGB757 MENUITEM "&8. 5R×7G×7B (245)", IDM_PAL_RGB577 MENUITEM "&9. 8R×8G×4B (256)", IDM_PAL_RGB884 MENUITEM "&A. 8R×4G×8B (256)", IDM_PAL_RGB848 MENUITEM "&B. 4R×8G×8B (256)", IDM_PAL_RGB488 END POPUP "&Optimized" BEGIN MENUITEM "&1. Popularity Algorithm (4 bits)", IDM_PAL_OPT_POP4 MENUITEM "&2. Popularity Algorithm (5 bits)", IDM_PAL_OPT_POP5 MENUITEM "&3. Popularity Algorithm (6 bits)", IDM_PAL_OPT_POP6 MENUITEM "&4. Median Cut Algorithm (4 bits)", IDM_PAL_OPT_MEDCUT END END POPUP "Con&vert" BEGIN MENUITEM "&1. to 1 bit per pixel", IDM_CONVERT_01 MENUITEM "&2. to 4 bits per Pixel", IDM_CONVERT_04 MENUITEM "&3. to 8 bit per pixel", IDM_CONVERT_08 MENUITEM "&4. to 16 bits per Pixel", IDM_CONVERT_16 MENUITEM "&5. to 24 bit per pixel", IDM_CONVERT_24 MENUITEM "&6. to 32 bits per Pixel", IDM_CONVERT_32 END POPUP "&Help" BEGIN MENUITEM "&About", IDM_APP_ABOUT END END ///////////////////////////////////////////////////////////////////////////// // // Accelerator // DIBBLE ACCELERATORS BEGIN "C", IDM_EDIT_COPY, VIRTKEY, CONTROL, NOINVERT "X", IDM_EDIT_CUT, VIRTKEY, CONTROL, NOINVERT VK_DELETE, IDM_EDIT_DELETE, VIRTKEY, NOINVERT "V", IDM_EDIT_PASTE, VIRTKEY, CONTROL, NOINVERT "O", IDM_FILE_OPEN, VIRTKEY, CONTROL, NOINVERT "P", IDM_FILE_PRINT, VIRTKEY, CONTROL, NOINVERT "S", IDM_FILE_SAVE, VIRTKEY, CONTROL, NOINVERT END #endif // 中文(简体，中国) resources ///////////////////////////////////////////////////////////////////////////// #ifndef APSTUDIO_INVOKED ///////////////////////////////////////////////////////////////////////////// // // Generated from the TEXTINCLUDE 3 resource. // ///////////////////////////////////////////////////////////////////////////// #endif // not APSTUDIO_INVOKED
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//
/*--------------------------------------------------------
DIBHELP.H Header file for DIBHELP.C
--------------------------------------------------------*/
#pragma once
#include <windows.h>
typedef void* HDIB;
//DIBHELP.C中的函数
BOOL DibIsValid(HDIB hdib); //Dib文件是否有效
HBITMAP DibBitmapHandle(HDIB hdib);
int DibWidth(HDIB hdib);
int DibHeight(HDIB hdib);
int DibBitCount(HDIB hdib);
int DibRowLength(HDIB hdib); //每行像素数：4的倍数
int DibNumColors(HDIB hdib);
DWORD DibMask(HDIB hdib, int i);//获取颜色掩码
int DibRShift(HDIB hdib, int i);//
int DibLShift(HDIB hdib, int i);
int DibCompression(HDIB hdib); //获取biCompression字段的值
BOOL DibIsAddressable(HDIB hdib);//是否被压缩,DibIsNotCompressed
DWORD DibInfoHeaderSize(HDIB hdib);
DWORD DibMaskSize(HDIB hdib);
DWORD DibColorSize(HDIB hdib);
DWORD DibInfoSize(HDIB hdib);
DWORD DibBitsSize(HDIB hdib);
DWORD DibTotalSize(HDIB hdib);
BITMAPINFOHEADER* DibInfoHeaderPtr(HDIB hdib);
DWORD* DibMaskPtr(HDIB hdib);
void* DibBitsPtr(HDIB hdib);
BOOL DibGetColor(HDIB hdib, int index, RGBQUAD* prgb);
BOOL DibSetColor(HDIB hdib, int index, RGBQUAD*prgb);
BYTE* DibPixelPtr(HDIB hdib, int x, int y);
DWORD DibGetPixel(HDIB hdib, int x, int y);
BOOL DibSetPixel(HDIB hdib, int x, int y, DWORD dwPixel);
BOOL DibGetPixelColor(HDIB hdib, int x, int y, RGBQUAD* prgb);
BOOL DibSetPixelColor(HDIB hdib, int x, int y, RGBQUAD* prgb);
HDIB DibCreateFromInfo(BITMAPINFO* pbmi);
BOOL DibDelete(HDIB hdib);
HDIB DibCreate(int cx, int cy, int cBits, int cColors);
HDIB DibCopy(HDIB hdibSrc, BOOL fRotate);
BITMAPINFO* DibCopyToPackedDib(HDIB hdib, BOOL fUsedGlobal);
HDIB DibCopyFromPackedDib(BITMAPINFO* pPackedDib);
HDIB DibFileLoad(const TCHAR* szFileName);
BOOL DibFileSave(HDIB hdib, const TCHAR* szFileName);
HBITMAP DibCopyToDdb(HDIB hdib, HWND hwnd, HPALETTE hPalette);
HDIB DibCreateFromDdb(HBITMAP hBitmap); //该函数课本没有给出实现
/*----------------------------------------------------------
DibFlipHorizontal：调用没有优化的DibSetPixel和DibGetPixel
----------------------------------------------------------*/
HDIB DibFlipHorizontal(HDIB hdibSrc);
/*----------------------------------------------------------
DibRotateRight：调用优化过的DibSetPixelx和DibGetPixelx
----------------------------------------------------------*/
HDIB DibRotateRight(HDIB hdibSrc);
/*----------------------------------------------------------
快速无边界检查的gets和Sets宏
----------------------------------------------------------*/
#define DibPixelPtr1(hdib,x,y) (((*(PBYTE**)hdib)[y]) +((x)>>3))
#define DibPixelPtr4(hdib,x,y) (((*(PBYTE**)hdib)[y]) +((x)>>1))
#define DibPixelPtr8(hdib,x,y) (((*(PBYTE**)hdib)[y]) + (x) )
#define DibPixelPtr16(hdib,x,y) ((WORD*)(((*(PBYTE**)hdib)[y]) + (x)*2 ))
#define DibPixelPtr24(hdib,x,y) ((RGBTRIPLE*)(((*(PBYTE**)hdib)[y]) + (x)*3 ))
#define DibPixelPtr32(hdib,x,y) ((DWORD*)(((*(PBYTE**)hdib)[y]) + (x)*4 ))
#define DibGetPixel1(hdib,x,y) (0x01&(*DibPixelPtr1(hdib,x,y) >> (7 -((x)&7))))
#define DibGetPixel4(hdib,x,y) (0x0F &(*DibPixelPtr4(hdib,x,y)>>((x)&1 ? 0 : 4)))
#define DibGetPixel8(hdib,x,y) (*DibPixelPtr8(hdib,x,y))
#define DibGetPixel16(hdib,x,y) (*DibPixelPtr16(hdib,x,y))
#define DibGetPixel24(hdib,x,y) (*DibPixelPtr24(hdib,x,y))
#define DibGetPixel32(hdib,x,y) (*DibPixelPtr32(hdib,x,y))
#define DibSetPixel1(hdib, x, y, p) \
((*DibPixelPtr1(hdib, x, y) &= ~(1 << (7 - ((x)& 7)))), (*DibPixelPtr1(hdib, x, y) |= ((p) << (7 - ((x)& 7)))))
#define DibSetPixel4(hdib, x, y, p) \
((*DibPixelPtr4(hdib, x, y) &= (0x0F << ((x)& 1 ? 4 : 0))), (*DibPixelPtr4(hdib, x, y) |= ((p) << ((x)& 1 ? 0 : 4))))
#define DibSetPixel8(hdib, x, y, p) (* DibPixelPtr8 (hdib, x, y) = p)
#define DibSetPixel16(hdib, x, y, p) (* DibPixelPtr16 (hdib, x, y) = p)
#define DibSetPixel24(hdib, x, y, p) (* DibPixelPtr24 (hdib, x, y) = p)
#define DibSetPixel32(hdib, x, y, p) (* DibPixelPtr32 (hdib, x, y) = p)
//DibHelp.c
/*-------------------------------------------------------------
DIBHELP.C -- DIB Section Helper Routines
(c)Charles Petzold,1998
-------------------------------------------------------------*/
#include <windows.h>
#include "DibHelp.h"
#define HDIB_SIGNATURE (*(int*)"Dib ")
typedef struct
{
PBYTE* ppRow; //像素位的行指针，必须是第一个字段，为后面的宏操作更容易设计的。
//第一个指针指向DIB位图视觉上最上面的一行像素，最后一个指针指向
//DIB图像最后一行的像素，和pBits字段一样（也就是pBits也要被存成
//这样的格式）
int iSignature; //="Dib "
HBITMAP hBitmap;//接收从CreateDIBSection返回的句柄，明显返回的是设备无关的位图，
//但可以直接被BitBlt或StretchBlt
BYTE* pBits; //指向位图的像素数据，其值在CreateDIBSection函数中被设定。其所指
//的内存块由操作系统管理，但应用程序可以访问该内存块。删除位图
//句柄后，该内存块自动被删除
DIBSECTION ds; //可以用GetObject获得位图信图，存入该结构体
int iRShift[3]; //分别存入R、G、B3种颜色遮罩需左移的值
int iLShift[3]; //
}DIBSTRUCT, *PDIBSTRUCT;
/*----------------------------------------------------------------------------------
DibIsValid：如果hdib指向一个有效的DIBSTRUCT结构体时返回TRUE
-----------------------------------------------------------------------------------*/
BOOL DibIsValid(HDIB hdib)
{
DIBSTRUCT* pdib = hdib;
if (pdib == NULL)
return FALSE;
//检查是否有读取指定内存的内容的权限,参数1为要检查的内存指针，参数2为要检查的内存块大小
if (IsBadReadPtr(pdib, sizeof(DIBSTRUCT)))
return FALSE;
if (pdib->iSignature != HDIB_SIGNATURE) //自定义的DIB位图标识符
return FALSE;
return TRUE;
}
/*----------------------------------------------------------------------------------
DibBitmapHandle：返回DIB Section位图对象的句柄hBitmap
-----------------------------------------------------------------------------------*/
HBITMAP DibBitmapHandle(HDIB hdib)
{
if (!DibIsValid(hdib))
return NULL;
return ((PDIBSTRUCT)hdib)->hBitmap;
}
/*----------------------------------------------------------------------------------
DibWidth：返回位图的宽度（单位字节）
-----------------------------------------------------------------------------------*/
int DibWidth(HDIB hdib)
{
if (!DibIsValid(hdib))
return 0;
return ((PDIBSTRUCT)hdib)->ds.dsBm.bmWidth;
}
/*----------------------------------------------------------------------------------
DibHeight：返回位图的高度（单位字节）
-----------------------------------------------------------------------------------*/
int DibHeight(HDIB hdib)
{
if (!DibIsValid(hdib))
return 0;
return ((PDIBSTRUCT)hdib)->ds.dsBm.bmHeight;
}
/*----------------------------------------------------------------------------------
DibBitCount：返回每像素的位数
-----------------------------------------------------------------------------------*/
int DibBitCount(HDIB hdib)
{
if (!DibIsValid(hdib))
return 0;
return ((PDIBSTRUCT)hdib)->ds.dsBm.bmBitsPixel;
}
/*----------------------------------------------------------------------------------
DibRowLength：返回每行像素的大小（单位：字节）：4的倍数
-----------------------------------------------------------------------------------*/
int DibRowLength(HDIB hdib)
{
if (!DibIsValid(hdib))
return 0;
return 4 * ((DibWidth(hdib)*DibBitCount(hdib) + 31) / 32);
}
/*----------------------------------------------------------------------------------
DibNumColors：返回颜色表的颜色数目，无颜色表时返回0
-----------------------------------------------------------------------------------*/
int DibNumColors(HDIB hdib)
{
PDIBSTRUCT pdib = hdib;
if (!DibIsValid(hdib))
return 0;
if (pdib->ds.dsBmih.biClrUsed != 0)
{
return pdib->ds.dsBmih.biClrUsed;
} else if (DibBitCount(hdib) <= 8)
{
return 1 << DibBitCount(hdib); //2^bBitCount,如1位则2种颜色，8位256色
}
return 0;
}
/*----------------------------------------------------------------------------------
DibMask：返回3种颜色遮罩其中的一种，如红色遮罩
-----------------------------------------------------------------------------------*/
DWORD DibMask(HDIB hdib, int i)
{
PDIBSTRUCT pdib = hdib;
if (!DibIsValid(hdib) || i<0 || i>2)
return 0;
return pdib->ds.dsBitfields[i];//0—红色；1—绿色；2—蓝色
}
/*----------------------------------------------------------------------------------
DibRShift：返回需右移的位数
-----------------------------------------------------------------------------------*/
int DibRShift(HDIB hdib, int i)
{
PDIBSTRUCT pdib = hdib;
if (!DibIsValid(hdib) || i<0 || i>2)
return 0;
return pdib->iRShift[i];
}
/*----------------------------------------------------------------------------------
DibLShift：返回需左移的位数
-----------------------------------------------------------------------------------*/
int DibLShift(HDIB hdib, int i)
{
PDIBSTRUCT pdib = hdib;
if (!DibIsValid(hdib) || i<0 || i>2)
return 0;
return pdib->iLShift[i];
}
/*----------------------------------------------------------------------------------
DibCompression： 获取biCompression字段的值
-----------------------------------------------------------------------------------*/
int DibCompression(HDIB hdib)
{
if (!DibIsValid(hdib))
return 0;
return ((PDIBSTRUCT)hdib)->ds.dsBmih.biCompression;
}
//是否被压缩,DibIsNotCompressed
/*----------------------------------------------------------------------------------
DibIsAddressable： 如果DIB没压缩则返回TRUE
-----------------------------------------------------------------------------------*/
BOOL DibIsAddressable(HDIB hdib)
{
int iCompression;
if (!DibIsValid(hdib))
return 0;
iCompression = DibCompression(hdib);
if (iCompression == BI_RGB || iCompression == BI_BITFIELDS)
return TRUE;
return FALSE;
}
/*----------------------------------------------------------------------------------
下面这些函数返回DIB Section可能出现的各种变量信息，这些函数的目的是为了将DIB Section
转换为紧凑DIB或保存文件时使用
-----------------------------------------------------------------------------------*/
DWORD DibInfoHeaderSize(HDIB hdib) //文件信息头BITMAPINFOHEADER（不含颜色遮罩、颜色表）等
{
if (!DibIsValid(hdib))
return 0;
return ((PDIBSTRUCT)hdib)->ds.dsBmih.biSize;
}
DWORD DibMaskSize(HDIB hdib)
{
PDIBSTRUCT pdib = hdib;
if (!DibIsValid(hdib))
return 0;
if (pdib->ds.dsBmih.biCompression == BI_BITFIELDS)
return 3 * sizeof(DWORD);
return 0;
}
DWORD DibColorSize(HDIB hdib)
{
return DibNumColors(hdib)*sizeof(RGBQUAD);
}
DWORD DibInfoSize(HDIB hdib)
{
return DibInfoHeaderSize(hdib) + DibMaskSize(hdib) + DibColorSize(hdib);
}
DWORD DibBitsSize(HDIB hdib)
{
PDIBSTRUCT pdib = hdib;
if (!DibIsValid(hdib))
return 0;
if (pdib->ds.dsBmih.biSizeImage != 0)
{
return pdib->ds.dsBmih.biSizeImage;
}
return DibHeight(hdib)*DibRowLength(hdib);
}
DWORD DibTotalSize(HDIB hdib) //整个紧凑型DIB的大小
{
return DibInfoSize(hdib) + DibBitsSize(hdib);
}
/*----------------------------------------------------------------------------------
下面这些函数返回DIB Section各部分的指针
-----------------------------------------------------------------------------------*/
BITMAPINFOHEADER* DibInfoHeaderPtr(HDIB hdib)
{
if (!DibIsValid(hdib))
return NULL;
return &(((PDIBSTRUCT)hdib)->ds.dsBmih);
}
DWORD* DibMaskPtr(HDIB hdib)
{
PDIBSTRUCT pdib = hdib;
if (!DibIsValid(hdib))
return NULL;
return pdib->ds.dsBitfields;//因为这个字段是个数组，数组名是个指针。
}
void* DibBitsPtr(HDIB hdib)
{
if (!DibIsValid(hdib))
return NULL;
return ((PDIBSTRUCT)hdib)->pBits;
}
/*----------------------------------------------------------------------------------
DibGetColor:从DIB颜色表中获得指定索引号处的颜色，放在prgb结构体中
-----------------------------------------------------------------------------------*/
BOOL DibGetColor(HDIB hdib, int index, RGBQUAD* prgb)
{
PDIBSTRUCT pdib = hdib;
HDC hdcMem;
int iReturn;
if (!DibIsValid(hdib))
return FALSE;
hdcMem = CreateCompatibleDC(NULL);
SelectObject(hdcMem, pdib->hBitmap);
iReturn = GetDIBColorTable(hdcMem, index, 1, prgb); //API函数
DeleteDC(hdcMem);
return iReturn ? TRUE : FALSE;
}
/*----------------------------------------------------------------------------------
DibSetColor:prgb结构体颜色设置到DIB颜色表中
-----------------------------------------------------------------------------------*/
BOOL DibSetColor(HDIB hdib, int index, RGBQUAD*prgb)
{
PDIBSTRUCT pdib = hdib;
HDC hdcMem;
int iReturn;
if (!DibIsValid(hdib))
return FALSE;
hdcMem = CreateCompatibleDC(NULL);
SelectObject(hdcMem, pdib->hBitmap);
iReturn = SetDIBColorTable(hdcMem, index, 1, prgb); //API函数
DeleteDC(hdcMem);
return iReturn ? TRUE : FALSE;
}
/*----------------------------------------------------------------------------------
DibPixelPtr:返回(x,y)处的像素位指针
-----------------------------------------------------------------------------------*/
BYTE* DibPixelPtr(HDIB hdib, int x, int y)
{
if (!DibIsAddressable(hdib))
return NULL;
if (x < 0 || x >= DibWidth(hdib) || y < 0 || y >= DibHeight(hdib))
return NULL;
//x每次加1时，指针后移BitCount/8个字节，所以对于每像素1或4位时，
//获取每个字节的像素还需移位才能读出像素值
//对于8、16、24或32位的，每bitCount/8个字节
//具体的处理 见DibGetPixel或DibSetPixel函数的处理。
return (((PDIBSTRUCT)hdib)->ppRow)[y] + (x* DibBitCount(hdib) >> 3);
}
/*----------------------------------------------------------------------------------
DibGetPixel:返回(x,y)处的像素值
-----------------------------------------------------------------------------------*/
DWORD DibGetPixel(HDIB hdib, int x, int y)
{
PBYTE pPixel;
pPixel = DibPixelPtr(hdib, x, y);
if (!pPixel)
return 0;
switch (DibBitCount(hdib))
{
//快速求余法：X % （2^N） == X & (2^N - 1)，
case 1: return 0x01 & (*pPixel >> (7 - (x & 7)));
case 4: return 0x0F & (*pPixel >> (x & 1 ? 0 : 4));//x为奇数是，取低4位，偶数取高4位
case 8: return *pPixel;
case 16:return *(WORD*)pPixel;
case 24:return 0x00FFFFFF & *(DWORD*)pPixel;
case 32:return *(DWORD*)pPixel;
}
return 0;
}
/*----------------------------------------------------------------------------------
DibSetPixel:设置(x,y)处的像素值
-----------------------------------------------------------------------------------*/
BOOL DibSetPixel(HDIB hdib, int x, int y, DWORD dwPixel)
{
PBYTE pPixel;
pPixel = DibPixelPtr(hdib, x, y);
if (!pPixel)
return FALSE;
switch (DibBitCount(hdib))
{
case 1:
*pPixel &= ~(1 << (7 - (x & 7))); //取出该字节中除x处外的其余像素数
*pPixel |= dwPixel << (7 - (x & 7));//将颜色值加入上述的X处。
break;
case 4:
*pPixel &= 0x0F << (x & 1 ? 4 : 0);
*pPixel |= dwPixel << (x & 1 ? 0 : 4);
break;
case 8:
*pPixel = (BYTE)dwPixel;
break;
case 16:
*(WORD*)pPixel = (WORD)dwPixel;
break;
case 24:
*(RGBTRIPLE*)pPixel = *(RGBTRIPLE*)&dwPixel;
break;
case 32:
*(DWORD*)pPixel = dwPixel;
break;
default:
return FALSE;
}
return TRUE;
}
/*----------------------------------------------------------------------------------
DibGetPixelColor:获得（x,y）处的颜色值，并放入prgb所指的结构体中
-----------------------------------------------------------------------------------*/
BOOL DibGetPixelColor(HDIB hdib, int x, int y, RGBQUAD* prgb)
{
DWORD dwPixel;
int iBitCount;
PDIBSTRUCT pdib = hdib;
//获得每像素位的大小，也可以使用它来作有效性验证
if (0 == (iBitCount = DibBitCount(hdib)))
return FALSE;
//获取像素位的值，返回DWORD，该值可能是索引或里面含有RGB值
dwPixel = DibGetPixel(hdib, x, y);
//如果是8位或以下的，该值为颜色表索引
if (iBitCount <= 8)
return DibGetColor(hdib, (int)dwPixel, prgb);
else if (iBitCount == 24)
{
*(RGBTRIPLE*)prgb = *(RGBTRIPLE*)&dwPixel;
prgb->rgbReserved = 0;
} else if (iBitCount == 32 && pdib->ds.dsBmih.biCompression == BI_RGB)
{
*prgb = *(RGBQUAD*)&dwPixel;
}
//此外的情况，使用颜色遮罩和移位
else
{
//下面等号右边的式子，执行顺序先用掩码取出dwPixel的相应颜色，再右移，最后左移。
prgb->rgbRed = (BYTE)((pdib->ds.dsBitfields[0] & dwPixel) >> pdib->iRShift[0] << pdib->iLShift[0]);
prgb->rgbGreen = (BYTE)((pdib->ds.dsBitfields[1] & dwPixel) >> pdib->iRShift[1] << pdib->iLShift[1]);
prgb->rgbBlue = (BYTE)((pdib->ds.dsBitfields[2] & dwPixel) >> pdib->iRShift[2] << pdib->iLShift[2]);
}
return TRUE;
}
/*----------------------------------------------------------------------------------
DibSetPixelColor:获得（x,y）处的颜色值
-----------------------------------------------------------------------------------*/
BOOL DibSetPixelColor(HDIB hdib, int x, int y, RGBQUAD* prgb)
{
DWORD dwPixel;
int iBitCount;
PDIBSTRUCT pdib = hdib;
//不要利用DIBs的颜色表来执行该函数的操作
iBitCount = DibBitCount(hdib);
if (iBitCount <= 8)
return FALSE;
//剩下来的步骤与GetPixelColor相反
else if (iBitCount == 24)
{
*(RGBTRIPLE*)&dwPixel = *(RGBTRIPLE*)prgb;
dwPixel &= 0x00FFFFFF;
} else if (iBitCount == 32 && pdib->ds.dsBmih.biCompression == BI_RGB)
{
*(RGBQUAD*)&dwPixel = *prgb;
} else
{
//先将rgbRed由字节转为DWORD,再右移，最后左移
dwPixel = (((DWORD)prgb->rgbRed >> pdib->iLShift[0]) << pdib->iRShift[0]);
dwPixel |= (((DWORD)prgb->rgbGreen >> pdib->iLShift[1]) << pdib->iRShift[1]);
dwPixel |= (((DWORD)prgb->rgbBlue >> pdib->iLShift[2]) << pdib->iRShift[2]);
}
DibSetPixel(hdib, x, y, dwPixel);
return TRUE;
}
/*----------------------------------------------------------------------------------
根据遮罩颜色计算移位值，这些颜色遮罩来自于DibCreateFromInfo函数
-----------------------------------------------------------------------------------*/
static int MaskToRShift(DWORD dwMask)
{
int iShift;
if (0 == dwMask)
return 0;
for (iShift = 0; !(dwMask & 1); iShift++) //最低位为0，则右移1位
dwMask >>= 1;
return iShift;
}
static int MaskToLShift(DWORD dwMask)
{
int iShift;
if (0 == dwMask)
return 0;
while (!(dwMask & 1)) //dwMask右侧的0移掉
dwMask >>= 1;
for (iShift = 0; dwMask & 1; iShift++) //统计1的个数
dwMask >>= 1;
return 8 - iShift;
}
/*----------------------------------------------------------------------------------
DibCreateFromInfo：
所有创建DIB的函数最后都要调用该函数。这个函数负责调用CreateDIBSection，
为DIBSTRUCT分配内存，并设置行指针
-----------------------------------------------------------------------------------*/
HDIB DibCreateFromInfo(BITMAPINFO* pbmi)
{
DIBSTRUCT* pdib;
BYTE* pBits;
HBITMAP hBitmap;
int i, y, cy, iRowLength;
//根据pbmi创建DIB Section位图，pBits指向今后要存入的像素位的空间地址（由系统管理）
hBitmap = CreateDIBSection(NULL, pbmi, DIB_RGB_COLORS, &pBits, NULL, 0);
if (NULL == hBitmap)
return NULL;
if (NULL == (pdib = malloc(sizeof(DIBSTRUCT))))
{
DeleteObject(hBitmap);
return NULL;
}
pdib->iSignature = HDIB_SIGNATURE;
pdib->hBitmap = hBitmap;
pdib->pBits = pBits;
//填充DIBSECTION结构
GetObject(hBitmap, sizeof(DIBSECTION), &pdib->ds);
//现在可以使用自定义的DIB信息函数,如DibCompression
//如果压缩格式是BI_BITFIELDS，则计算掩码的移位
if (DibCompression(pdib) == BI_BITFIELDS)
{
for (i = 0; i < 3; i++)
{
pdib->iLShift[i] = MaskToLShift(pdib->ds.dsBitfields[i]);
pdib->iRShift[i] = MaskToRShift(pdib->ds.dsBitfields[i]);
}
}
//如果是BI_RGB，但是16位或32位的，则设置bitFields和masks字段
else if (DibCompression(pdib) == BI_RGB)
{
if (DibBitCount(pdib) == 16) //RGB分别使用5-5-5型遮罩
{
pdib->ds.dsBitfields[0] = 0x00007C00; //R Mask
pdib->ds.dsBitfields[1] = 0x000003E0; //G Mask
pdib->ds.dsBitfields[2] = 0x0000001F; //B Mask
pdib->iRShift[0] = 10;
pdib->iRShift[1] = 5;
pdib->iRShift[2] = 0;
pdib->iLShift[0] = 3;
pdib->iLShift[1] = 3;
pdib->iLShift[2] = 3;
} else if (DibBitCount(pdib) == 24 || DibBitCount(pdib) == 32) //使用8-8-8型
{
pdib->ds.dsBitfields[0] = 0x00FF0000; //R Mask
pdib->ds.dsBitfields[1] = 0x0000FF00; //G Mask
pdib->ds.dsBitfields[2] = 0x000000FF; //B Mask
pdib->iRShift[0] = 16;
pdib->iRShift[1] = 8;
pdib->iRShift[2] = 0;
pdib->iLShift[0] = 0;
pdib->iLShift[1] = 0;
pdib->iLShift[2] = 0;
}
}
//分配DIB像素行指针数组
cy = DibHeight(pdib);
pdib->ppRow = malloc(cy*sizeof(BYTE*));
if (NULL == pdib->ppRow)
{
free(pdib);
DeleteObject(hBitmap);
return NULL;
}
//初始化像素行指针数组，ppRow[0]设为图像视觉上的最顶行。
iRowLength = DibRowLength(pdib);
if (pbmi->bmiHeader.biHeight>0) //位图从下到上存储
{
for (y = 0; y < cy; y++)
pdib->ppRow[y] = pBits + (cy - 1 - y)*iRowLength;
} else //从上到下存储
{
for (y = 0; y < cy; y++)
pdib->ppRow[y] = pBits + y*iRowLength;
}
return pdib;
}
/*----------------------------------------------------------------------------------
DibDelete：删除DIBSTRUCT和在其中分配的内存
-----------------------------------------------------------------------------------*/
BOOL DibDelete(HDIB hdib)
{
DIBSTRUCT* pdib = hdib;
if (!DibIsValid(hdib))
return FALSE;
free(pdib->ppRow);
DeleteObject(pdib->hBitmap);
free(pdib);
return TRUE;
}
/*-----------------------------------------------------------------------------------
DibCreate: 通过显式指定参数来构建HDIB（）
-----------------------------------------------------------------------------------*/
HDIB DibCreate(int cx, int cy, int cBits, int cColors)
{
HDIB hdib;
BITMAPINFO* pbmi;
DWORD dwInfoSize;
int cEntries = 1;
if (cx <= 0 || cy <= 0 ||
((cBits != 1) && (cBits != 4) && (cBits != 8) &&
(cBits != 16) && (cBits != 24) && (cBits != 32)))
{
return NULL;
}
if (cColors != 0)
cEntries = cColors;
else if (cBits <= 8)
cEntries = 1 << cBits;
dwInfoSize = sizeof(BITMAPINFOHEADER) + (cEntries - 1)*sizeof(RGBQUAD);
if (NULL == (pbmi = malloc(dwInfoSize)))
{
return NULL;
}
ZeroMemory(pbmi, dwInfoSize);
pbmi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
pbmi->bmiHeader.biWidth = cx;
pbmi->bmiHeader.biHeight = cy;
pbmi->bmiHeader.biPlanes = 1;
pbmi->bmiHeader.biBitCount = cBits;
pbmi->bmiHeader.biCompression = BI_RGB;
pbmi->bmiHeader.biSizeImage = 0;
pbmi->bmiHeader.biXPelsPerMeter = 0;
pbmi->bmiHeader.biYPelsPerMeter = 0;
pbmi->bmiHeader.biClrUsed = cColors;
pbmi->bmiHeader.biClrImportant = 0;
hdib = DibCreateFromInfo(pbmi);
free(pbmi);
return hdib;
}
/*-----------------------------------------------------------------------------------
DibCopyToInfo: 构建BITMAPINFO结构体.(主要供DibCopy和DibCopyToDdb函数使用)
-----------------------------------------------------------------------------------*/
static BITMAPINFO* DibCopyToInfo(HDIB hdib)
{
BITMAPINFO* pbmi;
RGBQUAD* prgb;
int i, iNumColors;
if (!DibIsValid(hdib))
return NULL;
if (NULL == (pbmi = malloc(DibInfoSize(hdib))))
return NULL;
//复制BITMAPINFO信息头部分
CopyMemory(pbmi, DibInfoHeaderPtr(hdib), sizeof(BITMAPINFOHEADER));
//复制可能的颜色遮罩
prgb = (RGBQUAD*)((BYTE*)pbmi + sizeof(BITMAPINFOHEADER));
if (DibMaskSize(hdib))
{
CopyMemory(prgb, DibMaskPtr(hdib), 3 * sizeof(DWORD));
prgb = (RGBQUAD*)((BYTE*)prgb + 3 * sizeof(DWORD));//将指针移到遮罩后，指向颜色表
}
//复制颜色表
iNumColors = DibNumColors(hdib);
for (i = 0; i < iNumColors; i++)
{
DibGetColor(hdib, i, prgb + i); //每种颜色都是32位的。RGRQUAD也是32位的
}
return pbmi;
}
/*-----------------------------------------------------------------------------------
DibCopy: 从一个己经存在的DIB Section去创建一个新的DIB Section（注意：可以会交换
宽度与高度）
-----------------------------------------------------------------------------------*/
HDIB DibCopy(HDIB hdibSrc, BOOL fRotate)
{
BITMAPINFO* pbmi;
BYTE *pBitsSrc, *pBitsDst;
HDIB hdibDst;
if (!DibIsValid(hdibSrc))
return NULL;
if (NULL == (pbmi = DibCopyToInfo(hdibSrc)))
return NULL;
if (fRotate)
{
pbmi->bmiHeader.biWidth = DibHeight(hdibSrc);
pbmi->bmiHeader.biHeight = DibWidth(hdibSrc);
}
hdibDst = DibCreateFromInfo(pbmi);
free(pbmi);
if (!fRotate) //不旋转时直接复制像素数据。旋转时，需自行处理
{
pBitsSrc = DibBitsPtr(hdibSrc);
pBitsDst = DibBitsPtr(hdibDst);
CopyMemory(pBitsDst, pBitsSrc, DibBitsSize(hdibSrc));
}
return hdibDst;
}
/*-----------------------------------------------------------------------------------
DibCopyToPackedDib:
通常用于保存DIBs或将DIBs传输到剪贴板。当传输到剪贴板时，第2个参数必须设为TRUE，以便
分配一个全局共享内存
-----------------------------------------------------------------------------------*/
BITMAPINFO* DibCopyToPackedDib(HDIB hdib, BOOL fUsedGlobal)
{
BITMAPINFO* pPackedDib;
DWORD dwDibSize;
HGLOBAL hGlobal = NULL;
PDIBSTRUCT pdib = hdib;
RGBQUAD* prgb;
BYTE* pBits;
int iNumColors;
HDC hdcMem;
if (!DibIsValid(hdib))
return NULL;
//为紧凑型DIB分配内存
dwDibSize = DibTotalSize(hdib);
if (fUsedGlobal)
{
hGlobal = GlobalAlloc(GHND | GMEM_SHARE, dwDibSize);
pPackedDib = GlobalLock(hGlobal);
} else
{
pPackedDib = malloc(dwDibSize);
}
if (NULL == pPackedDib)
return NULL;
//复制信息头
CopyMemory(pPackedDib, &pdib->ds.dsBmih, sizeof(BITMAPINFOHEADER));
prgb = (RGBQUAD*)((BYTE*)pPackedDib + sizeof(BITMAPINFOHEADER));
//复制可能的颜色遮罩
if (pdib->ds.dsBmih.biCompression == BI_BITFIELDS)
{
CopyMemory(prgb, pdib->ds.dsBitfields, 3 * sizeof(DWORD));
prgb = (RGBQUAD*)((BYTE*)prgb + 3 * sizeof(DWORD));
}
//复制颜色表
if (iNumColors = DibNumColors(hdib))
{
hdcMem = CreateCompatibleDC(NULL);
SelectObject(hdcMem, pdib->hBitmap);
GetDIBColorTable(hdcMem, 0, iNumColors, prgb);
DeleteDC(hdcMem);
}
//复制像素数据
pBits = (BYTE*)(prgb + iNumColors);
CopyMemory(pBits, pdib->pBits, DibBitsSize(hdib));
//如果最后一个参数是TRUE，解锁全局内存块，并将全局句块转化为指针返回
if (fUsedGlobal)
{
GlobalUnlock(hGlobal);
pPackedDib = (BITMAPINFO*)hGlobal;
}
return pPackedDib;
}
/*-----------------------------------------------------------------------------------
DibCopyFromPackedDib:通常用于从剪贴板中粘贴DIBs
-----------------------------------------------------------------------------------*/
HDIB DibCopyFromPackedDib(BITMAPINFO* pPackedDib)
{
BYTE* pBits;
DWORD dwInfoSize, dwMaskSize, dwColorSize;
int iBitCount;
PDIBSTRUCT pdib;
//获取信息头类型，并做有效性验证
dwInfoSize = pPackedDib->bmiHeader.biSize;
if (dwInfoSize != sizeof(BITMAPCOREHEADER) &&
dwInfoSize != sizeof(BITMAPINFOHEADER) &&
dwInfoSize != sizeof(BITMAPV4HEADER) &&
dwInfoSize != sizeof(BITMAPV5HEADER))
{
return NULL;
}
//获取可能的颜色遮罩的大小
if (dwInfoSize == sizeof(BITMAPINFOHEADER) &&
pPackedDib->bmiHeader.biCompression == BI_BITFIELDS)
{
dwMaskSize = 3 * sizeof(DWORD);
} else
{
dwMaskSize = 0;
}
//获取颜色表的大小
if (dwInfoSize == sizeof(BITMAPCOREHEADER))
{
iBitCount = ((BITMAPCOREHEADER*)pPackedDib)->bcBitCount;
if (iBitCount <= 8)
{
dwColorSize = (1 << (iBitCount))*sizeof(RGBTRIPLE);
} else
dwColorSize = 0;
} else //所有非OS/2的DIBs
{
if (pPackedDib->bmiHeader.biClrUsed >0)
{
dwColorSize = pPackedDib->bmiHeader.biClrUsed*sizeof(RGBQUAD);
} else if (pPackedDib->bmiHeader.biBitCount <= 8)
{
dwColorSize = (1 << pPackedDib->bmiHeader.biBitCount)*sizeof(RGBQUAD);
} else
{
dwColorSize = 0;
}
}
//最后，获得pPackedDIB像素位的指针
pBits = (BYTE*)pPackedDib + dwInfoSize + dwMaskSize + dwColorSize;
//创建HDIB
pdib = DibCreateFromInfo(pPackedDib);
//复制像素位数据
CopyMemory(pdib->pBits, pBits, DibBitsSize(pdib));
return pdib;
}
/*----------------------------------------------------------------------------------
DibFileLoad：从DIB文件中创建DIB Section
-----------------------------------------------------------------------------------*/
HDIB DibFileLoad(const TCHAR* szFileName)
{
HANDLE hFile;
BITMAPFILEHEADER bmfh;
BITMAPINFO* pbmi;
BOOL bSuccess;
DWORD dwInfoSize, dwBytesRead, dwBitsSize;
HDIB hDib;
//打开文件（设为可读可写）
hFile = CreateFile(szFileName, GENERIC_READ, FILE_SHARE_READ, NULL,
OPEN_EXISTING, FILE_FLAG_SEQUENTIAL_SCAN, NULL);
if (hFile == INVALID_HANDLE_VALUE)
return NULL;
//读取文件头信息
bSuccess = ReadFile(hFile, &bmfh, sizeof(BITMAPFILEHEADER), &dwBytesRead, NULL);
if (!bSuccess || (dwBytesRead != sizeof(BITMAPFILEHEADER))
|| (bmfh.bfType != *(WORD*)"BM"))
{
CloseHandle(hFile);
return NULL;
}
//分配信息头大小，并读入数据
dwInfoSize = bmfh.bfOffBits - sizeof(BITMAPFILEHEADER);
pbmi = malloc(dwInfoSize);
if (NULL == pbmi)
{
CloseHandle(hFile);
return NULL;
}
bSuccess = ReadFile(hFile, pbmi, dwInfoSize, &dwBytesRead, NULL);
if (!bSuccess || (dwBytesRead != dwInfoSize))
{
CloseHandle(hFile);
free(pbmi);
return NULL;
}
//根据BITMAPINFO结构体来创建DIB
hDib = DibCreateFromInfo(pbmi);
free(pbmi);
if (NULL == hDib)
{
CloseHandle(hFile);
return NULL;
}
//读取像素位数据，放到DIBSTRUCT结构中pBits字段指向的空间中去
dwBitsSize = bmfh.bfSize - bmfh.bfOffBits;
bSuccess = ReadFile(hFile, ((PDIBSTRUCT)hDib)->pBits, dwBitsSize, &dwBytesRead, NULL);
CloseHandle(hFile);
if (!bSuccess || (dwBytesRead != dwBitsSize))
{
DibDelete(hDib);
return NULL;
}
return hDib;
}
/*----------------------------------------------------------------------------------
DibFileSave：将DIB Section位图保存到文件中
-----------------------------------------------------------------------------------*/
BOOL DibFileSave(HDIB hdib, const TCHAR* szFileName)
{
BITMAPFILEHEADER bmfh;
BITMAPINFO* pbmi;
BOOL bSuccess;
DWORD dwTotalSize, dwBytesWritten;
HANDLE hFile;
hFile = CreateFile(szFileName, GENERIC_WRITE, 0, NULL,
CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
if (INVALID_HANDLE_VALUE == hFile)
return FALSE;
dwTotalSize = DibTotalSize(hdib);
bmfh.bfType = *(WORD*)"BM";
bmfh.bfSize = sizeof(BITMAPFILEHEADER) + dwTotalSize;
bmfh.bfReserved1 = 0;
bmfh.bfReserved2 = 0;
bmfh.bfOffBits = bmfh.bfSize - DibBitsSize(hdib);
//写入BITMAPFILEHEADER
bSuccess = WriteFile(hFile, &bmfh, sizeof(BITMAPFILEHEADER), &dwBytesWritten, NULL);
if (!bSuccess || (dwBytesWritten != sizeof(BITMAPFILEHEADER)))
{
CloseHandle(hFile);
DeleteFile(szFileName);
return FALSE;
}
//获取整个紧凑型DIB格式
pbmi = DibCopyToPackedDib(hdib, FALSE);
if (NULL == pbmi)
{
CloseHandle(hFile);
DeleteFile(szFileName);
return FALSE;
}
//写入pbmi指定的整个紧凑型DIB
bSuccess = WriteFile(hFile, pbmi, dwTotalSize, &dwBytesWritten, NULL);
CloseHandle(hFile);
free(pbmi);
if (!bSuccess || (dwBytesWritten != dwTotalSize))
{
DeleteFile(szFileName);
return FALSE;
}
return TRUE;
}
/*----------------------------------------------------------------------------------
DibCopyToDdb：更高效的屏幕显示
-----------------------------------------------------------------------------------*/
HBITMAP DibCopyToDdb(HDIB hdib, HWND hwnd, HPALETTE hPalette)
{
HBITMAP hBitmap;
BITMAPINFO* pbmi;
HDC hdc;
if (!DibIsValid(hdib))
return NULL;
if (NULL == (pbmi = DibCopyToInfo(hdib)))
return NULL;
hdc = GetDC(hwnd);
if (hPalette)
{
SelectPalette(hdc, hPalette, FALSE);
RealizePalette(hdc);
}
hBitmap = CreateDIBitmap(hdc, DibInfoHeaderPtr(hdib), CBM_INIT,
DibBitsPtr(hdib), pbmi, DIB_RGB_COLORS);
ReleaseDC(hwnd, hdc);
free(pbmi);
return hBitmap;
}
/*----------------------------------------------------------------------------------
DibFlipHorizontal：调用没有优化的DibSetPixel和DibGetPixel
----------------------------------------------------------------------------------*/
HDIB DibFlipHorizontal(HDIB hdibSrc)
{
HDIB hdibDst;
int cx, cy, x, y;
if (!DibIsAddressable(hdibSrc))
return NULL;
if (NULL == (hdibDst = DibCopy(hdibSrc, FALSE)))
return NULL;
cx = DibWidth(hdibSrc);
cy = DibHeight(hdibSrc);
for (x = 0; x < cx; x++)
for (y = 0; y < cy; y++)
{
DibSetPixel(hdibDst, x, cy - 1 - y, DibGetPixel(hdibSrc, x, y));
}
return hdibDst;
}
/*----------------------------------------------------------------------------------
DibRotateRight：调用优化过的DibSetPixelx和DibGetPixelx
----------------------------------------------------------------------------------*/
HDIB DibRotateRight(HDIB hdibSrc)
{
HDIB hdibDst;
int cx, cy, x, y;
if (!DibIsAddressable(hdibSrc))
return NULL;
if (NULL == (hdibDst = DibCopy(hdibSrc, TRUE)))
return NULL;
cx = DibWidth(hdibSrc);
cy = DibHeight(hdibSrc);
switch (DibBitCount(hdibSrc))
{
case 1:
for (x = 0; x < cx; x++)
for (y = 0; y < cy; y++)
{
DibSetPixel1(hdibDst, cy - 1 - y, x, DibGetPixel1(hdibSrc, x, y)); //坐标旋转
}
break;
case 4:
for (x = 0; x < cx; x++)
for (y = 0; y < cy; y++)
{
DibSetPixel4(hdibDst, cy - 1 - y, x, DibGetPixel4(hdibSrc, x, y));
}
break;
case 8:
for (x = 0; x < cx; x++)
for (y = 0; y < cy; y++)
{
DibSetPixel8(hdibDst, cy - 1 - y, x, DibGetPixel8(hdibSrc, x, y));
}
break;
case 16:
for (x = 0; x < cx; x++)
for (y = 0; y < cy; y++)
{
DibSetPixel16(hdibDst, cy - 1 - y, x, DibGetPixel16(hdibSrc, x, y));
}
break;
case 24:
for (x = 0; x < cx; x++)
for (y = 0; y < cy; y++)
{
DibSetPixel24(hdibDst, cy - 1 - y, x, DibGetPixel24(hdibSrc, x, y));
}
break;
case 32:
for (x = 0; x < cx; x++)
for (y = 0; y < cy; y++)
{
DibSetPixel32(hdibDst, cy - 1 - y, x, DibGetPixel32(hdibSrc, x, y));
}
break;
}
return hdibDst;
}
时间： 2024-11-07 04:06:36