创建纯色bitmap和替换bitmap颜色

1、替换bitmap颜色

//-------------------------------------------------------------------------------
// ReplaceColor
//
// Author    : Dimitri Rochette drochette@coldcat.fr
// Specials Thanks to Joe Woodbury for his comments and code corrections
//
// Includes  : Only <windows.h>//
// hBmp         : Source Bitmap
// cOldColor : Color to replace in hBmp
// cNewColor : Color used for replacement
// hBmpDC    : DC of hBmp ( default NULL ) could be NULL if hBmp is not selected
//
// Retcode   : HBITMAP of the modified bitmap or NULL for errors
//
//-------------------------------------------------------------------------------
HBITMAP ReplaceColor(HBITMAP hBmp, COLORREF cOldColor, COLORREF cNewColor, HDC hBmpDC)
{HBITMAP RetBmp = NULL;if (hBmp){HDC BufferDC = CreateCompatibleDC(NULL);    // DC for Source Bitmapif (BufferDC){HBITMAP hTmpBitmap = (HBITMAP)NULL;if (hBmpDC)if (hBmp == (HBITMAP)GetCurrentObject(hBmpDC, OBJ_BITMAP)){hTmpBitmap = CreateBitmap(1, 1, 1, 1, NULL);SelectObject(hBmpDC, hTmpBitmap);}HGDIOBJ PreviousBufferObject = SelectObject(BufferDC, hBmp);// here BufferDC contains the bitmapHDC DirectDC = CreateCompatibleDC(NULL); // DC for workingif (DirectDC){// Get bitmap sizeBITMAP bm;GetObject(hBmp, sizeof(bm), &bm);// create a BITMAPINFO with minimal initilisation // for the CreateDIBSectionBITMAPINFO RGB32BitsBITMAPINFO;ZeroMemory(&RGB32BitsBITMAPINFO, sizeof(BITMAPINFO));RGB32BitsBITMAPINFO.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);RGB32BitsBITMAPINFO.bmiHeader.biWidth = bm.bmWidth;RGB32BitsBITMAPINFO.bmiHeader.biHeight = bm.bmHeight;RGB32BitsBITMAPINFO.bmiHeader.biPlanes = 1;RGB32BitsBITMAPINFO.bmiHeader.biBitCount = 32;// pointer used for direct Bitmap pixels accessUINT * ptPixels;HBITMAP DirectBitmap = CreateDIBSection(DirectDC,(BITMAPINFO *)&RGB32BitsBITMAPINFO,DIB_RGB_COLORS,(void **)&ptPixels,NULL, 0);if (DirectBitmap){// here DirectBitmap!=NULL so ptPixels!=NULL no need to testHGDIOBJ PreviousObject = SelectObject(DirectDC, DirectBitmap);BitBlt(DirectDC, 0, 0,bm.bmWidth, bm.bmHeight,BufferDC, 0, 0, SRCCOPY);// here the DirectDC contains the bitmap// Convert COLORREF to RGB (Invert RED and BLUE)cOldColor = COLORREF2RGB(cOldColor);cNewColor = COLORREF2RGB(cNewColor);// After all the inits we can do the job : Replace Colorfor (int i = ((bm.bmWidth*bm.bmHeight) - 1); i >= 0; i--){if (ptPixels[i] == cOldColor) ptPixels[i] = cNewColor;}// little clean up// Don't delete the result of SelectObject because it's // our modified bitmap (DirectBitmap)SelectObject(DirectDC, PreviousObject);// finishRetBmp = DirectBitmap;}// clean upDeleteDC(DirectDC);}if (hTmpBitmap){SelectObject(hBmpDC, hBmp);DeleteObject(hTmpBitmap);}SelectObject(BufferDC, PreviousBufferObject);// BufferDC is now uselessDeleteDC(BufferDC);}}return RetBmp;
}

2、创建纯色bitmap

//cNewColor:指定颜色
//width:宽 height：高
HBITMAP CreatePureColorBitmap(COLORREF cNewColor, LONG width, LONG height)
{HBITMAP RetBmp = NULL;HDC DirectDC = CreateCompatibleDC(NULL); // DC for workingif (DirectDC){// create a BITMAPINFO with minimal initilisation // for the CreateDIBSectionBITMAPINFO RGB32BitsBITMAPINFO;ZeroMemory(&RGB32BitsBITMAPINFO, sizeof(BITMAPINFO));RGB32BitsBITMAPINFO.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);RGB32BitsBITMAPINFO.bmiHeader.biWidth = width;RGB32BitsBITMAPINFO.bmiHeader.biHeight = height;RGB32BitsBITMAPINFO.bmiHeader.biPlanes = 1;RGB32BitsBITMAPINFO.bmiHeader.biBitCount = 32;// pointer used for direct Bitmap pixels accessUINT * ptPixels;HBITMAP DirectBitmap = CreateDIBSection(DirectDC,(BITMAPINFO *)&RGB32BitsBITMAPINFO,DIB_RGB_COLORS,(void **)&ptPixels,NULL, 0);if (DirectBitmap){// here DirectBitmap!=NULL so ptPixels!=NULL no need to testHGDIOBJ PreviousObject = SelectObject(DirectDC, DirectBitmap);cNewColor = COLORREF2RGB(cNewColor);// After all the inits we can do the job : Replace Colorfor (int i = ((width*height) - 1); i >= 0; i--){ptPixels[i] = cNewColor;}// little clean up// Don't delete the result of SelectObject because it's // our modified bitmap (DirectBitmap)SelectObject(DirectDC, PreviousObject);// finishRetBmp = DirectBitmap;}// clean upDeleteDC(DirectDC);}return RetBmp;
}

本文不算原创，只是参考了别人代码然后验证并修改为自己想要的功能。由于对Bitmap不熟悉，查找代码也耗费了不少时间，因此在这里做个记录。

原代码地址地址：https://www.codeproject.com/articles/2841/how-to-replace-a-color-in-a-hbitmap

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