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Avoid excessive text clipping on Windows

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Use a better rounding strategy so that when the bounding box involves
part of a pixel we include the full pixel, so floor for -ve values and
ceil for +ve ones.  Without this I see lots of cut text on Windows.

Change-Id: I258f63eb37911574cd3f6f08da22349756c0775c
This commit is contained in:
Khaled Hosny
2016-10-31 04:46:34 +02:00
parent ebe3fd5291
commit 4b4abb73fc
1 changed files with 4 additions and 4 deletions
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8
vcl/win/gdi/winlayout.cxx
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@@ -3611,10 +3611,10 @@ std::vector<Rectangle> D2DWriteTextOutRenderer::GetGlyphInkBoxes(uint16_t * pGid
bottom = INT32(m.advanceHeight) - m.verticalOriginY - m.bottomSideBearing; bottom = INT32(m.advanceHeight) - m.verticalOriginY - m.bottomSideBearing;
// Scale to screen space. // Scale to screen space.
pOut->Left() = std::lround(left * mlfEmHeight / aFontMetrics.designUnitsPerEm); pOut->Left() = std::floor(left * mlfEmHeight / aFontMetrics.designUnitsPerEm);
pOut->Top() = std::lround(top * mlfEmHeight / aFontMetrics.designUnitsPerEm); pOut->Top() = std::floor(top * mlfEmHeight / aFontMetrics.designUnitsPerEm);
pOut->Right() = std::lround(right * mlfEmHeight / aFontMetrics.designUnitsPerEm); pOut->Right() = std::ceil(right * mlfEmHeight / aFontMetrics.designUnitsPerEm);
pOut->Bottom() = std::lround(bottom * mlfEmHeight / aFontMetrics.designUnitsPerEm); pOut->Bottom() = std::ceil(bottom * mlfEmHeight / aFontMetrics.designUnitsPerEm);
++pOut; ++pOut;
} }