我正在使用IImageList
和为任何给定路径提取巨型图标SHGetFileInfo
。一旦我有了它,我就可以将它渲染HICON
成一个HBITMAP
使用DrawIconEx
GDI+Bitmap
和Graphics
对象的最终渲染。
现在,这一切都很好,除了当我对位图进行最终渲染时,最左边的边缘总是有一个黑色伪影。对于我得到的几乎所有图标都是如此,并且始终是左边缘。
暗线可能来自哪里的任何想法?
我使用的代码大致是:
1.提取图标:
// Get the image list index of the icon
SHFILEINFO sfi;
if (!SHGetFileInfo(pszPath, 0, &sfi, sizeof(sfi), SHGFI_SYSICONINDEX)) return NULL;
// Get the jumbo image list
IImageList *piml;
if (FAILED(SHGetImageList(SHIL_JUMBO, IID_PPV_ARGS(&piml)))) return NULL;
// Extract an icon
HICON hicon;
piml->GetIcon(sfi.iIcon, ILD_SCALE|ILD_TRANSPARENT, &hicon);
return hicon;
2.生成位图
HDC hDC = GetDC(NULL);
HDC hMemDC = CreateCompatibleDC(hDC);
HBITMAP hMemBmp = CreateCompatibleBitmap(hDC, x, y);
HBITMAP hResultBmp = NULL;
HGDIOBJ hOrgBMP = SelectObject(hMemDC, hMemBmp);
HBRUSH hbr = CreateSolidBrush(bg);
RECT rr = { 0, 0, 256, 256 }; // jumbo icons
FillRect(hMemDC, &rr, hbr);
DeleteBrush(hbr);
DrawIconEx(hMemDC, 0, 0, hicon, size, size, 0, NULL, DI_NORMAL);
hResultBmp = hMemBmp;
hMemBmp = NULL;
SelectObject(hMemDC, hOrgBMP);
return hResultBitmap;
3.将GDI+位图渲染到“窗口位图”:
Bitmap *b = ::New Bitmap(hResultBitmap, NULL);
Graphics graphics(hdc);
graphics.SetTextRenderingHint(TextRenderingHintClearTypeGridFit);
SolidBrush bgbrush(Color(255, 255, 255, 255));
Rect r(0, 0, hwnd_w, hwnd_h);
graphics.FillRectangle(&bgbrush, r);
graphics.SetInterpolationMode(InterpolationModeHighQualityBicubic);
Rect r(5, 5, 128, 128);
graphics.DrawImage(dpd->image_to_draw, r);