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Text output needs clipping? |
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esc67 
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Joined: 09 June 2005 Status: Offline Points: 29 |
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 Topic: Text output needs clipping?Posted: 07 February 2007 at 12:17am |
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I noticed a similar problem in the MDI Text Editor sample (straight Debug build, no changes). In my case entire letters are missing.
See how the "e" in "parent:file" is totally occluded:
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_esl
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Joined: 23 January 2007 Status: Offline Points: 1 |
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Posted: 23 January 2007 at 6:31pm |
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I noticed that when the font is set to Consolas and ClearType rendering is on, I can see that sometimes the last column of pixels of a text block is overdrawn by the next block, cropping round letters:
 The effect disappeared when I changed CXTPSyntaxEditPaintManager::DrawLineText to use ExtTextOut with clipping:
... CRect rcBGex(nOutCol, /*nTxtBottom - 1 -> */iLine, nOutCol + nTxtWidth, nTxtBottom); ... pDC->FillSolidRect(&rcBGex, pDC->GetBkColor()); /* pDC->TextOut(nOutCol, iLine, pOutText, nOutTextLen); -> */ pDC->ExtTextOut(nOutCol, iLine, ETO_CLIPPED|ETO_OPAQUE, &rcBGex, pOutText, nOutTextLen, NULL); |
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