82 lines
2.3 KiB
C++
82 lines
2.3 KiB
C++
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//---------------------------------------------------------------------------
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// BmpCache.cpp - single bitmap/hdc cache object for uxtheme
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//---------------------------------------------------------------------------
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#include "stdafx.h"
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#include "BmpCache.h"
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//---------------------------------------------------------------------------
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CBitmapCache::CBitmapCache()
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{
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_hBitmap = NULL;
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_iWidth = 0;
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_iHeight = 0;
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InitializeCriticalSection(&_csBitmapCache);
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}
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//---------------------------------------------------------------------------
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CBitmapCache::~CBitmapCache()
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{
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if (_hBitmap)
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{
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DeleteObject(_hBitmap);
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}
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DeleteCriticalSection(&_csBitmapCache);
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}
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//---------------------------------------------------------------------------
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HBITMAP CBitmapCache::AcquireBitmap(HDC hdc, int iWidth, int iHeight)
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{
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EnterCriticalSection(&_csBitmapCache);
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if ((iWidth > _iWidth) || (iHeight > _iHeight) || (! _hBitmap))
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{
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if (_hBitmap)
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{
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DeleteObject(_hBitmap);
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_hBitmap = NULL;
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_iWidth = 0;
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_iHeight = 0;
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}
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//---- create new bitmap & hdc ----
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struct {
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BITMAPINFOHEADER bmih;
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ULONG masks[3];
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} bmi;
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bmi.bmih.biSize = sizeof(bmi.bmih);
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bmi.bmih.biWidth = iWidth;
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bmi.bmih.biHeight = iHeight;
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bmi.bmih.biPlanes = 1;
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bmi.bmih.biBitCount = 32;
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bmi.bmih.biCompression = BI_BITFIELDS;
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bmi.bmih.biSizeImage = 0;
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bmi.bmih.biXPelsPerMeter = 0;
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bmi.bmih.biYPelsPerMeter = 0;
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bmi.bmih.biClrUsed = 3;
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bmi.bmih.biClrImportant = 0;
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bmi.masks[0] = 0xff0000; // red
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bmi.masks[1] = 0x00ff00; // green
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bmi.masks[2] = 0x0000ff; // blue
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_hBitmap = CreateDIBitmap(hdc, &bmi.bmih, CBM_CREATEDIB , NULL, (BITMAPINFO*)&bmi.bmih,
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DIB_RGB_COLORS);
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if (_hBitmap)
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{
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_iWidth = iWidth;
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_iHeight = iHeight;
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}
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}
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return _hBitmap;
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}
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//---------------------------------------------------------------------------
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void CBitmapCache::ReturnBitmap()
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{
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LeaveCriticalSection(&_csBitmapCache);
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}
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//---------------------------------------------------------------------------
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