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Fix for Bug#124543

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BeOS MathML implementation


r-rbs (rbs@maths.uq.edu.au)
a=roc+moz
This commit is contained in:
arougthopher%lizardland.net 2002-03-13 01:02:25 +00:00
parent 299b47cf06
commit 0897a30aaf
1 changed files with 54 additions and 4 deletions
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58
gfx/src/beos/nsRenderingContextBeOS.cpp
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@ -1105,8 +1105,32 @@ NS_IMETHODIMP
nsRenderingContextBeOS::GetBoundingMetrics(const char* aString,
PRUint32 aLength,
nsBoundingMetrics& aBoundingMetrics) {
// Fill me up
return NS_ERROR_NOT_IMPLEMENTED;
aBoundingMetrics.Clear();
if (0 >= aLength || !aString || !mCurrentFont)
return NS_ERROR_FAILURE;
BRect rect;
escapement_delta delta;
delta.nonspace = 0;
delta.space = 0;
// Use the printing metric to get more detail
mCurrentFont->GetBoundingBoxesForStrings(&aString, 1, B_PRINTING_METRIC, &delta, &rect);
aBoundingMetrics.width = NSToCoordRound(mCurrentFont->StringWidth(aString) * mP2T);
aBoundingMetrics.leftBearing = NSToCoordRound(rect.left * mP2T);
aBoundingMetrics.rightBearing = NSToCoordRound(rect.right * mP2T);
// The pen position for DrawString is at the baseline of the font for BeOS.
// The orientation for drawing moves downward for vertical metrics.
// MathML expects what X Windows does: the orientation of the ascent moves upward from the baseline.
// So, we need to negate the top value returned by GetBoundingBoxesForStrings, to have that value
// move up in BeOS.
aBoundingMetrics.ascent = NSToCoordRound((-rect.top) * mP2T);
aBoundingMetrics.descent = NSToCoordRound(rect.bottom * mP2T);
return NS_OK;
}
/**
@ -1117,7 +1141,33 @@ nsRenderingContextBeOS::GetBoundingMetrics(const PRUnichar* aString,
PRUint32 aLength,
nsBoundingMetrics& aBoundingMetrics,
PRInt32* aFontID) {
// Fill me up
return NS_ERROR_NOT_IMPLEMENTED;
aBoundingMetrics.Clear();
nsresult r = NS_OK;
if (0 < aLength) {
if (aString == NULL)
return NS_ERROR_FAILURE;
// Since more often than not, single char strings are passed to this function
// we will try keep this on the stack, instead of the heap
uint8 utf8buf[1024];
uint8* utf8str = (uint8*)&utf8buf;
if (aLength * 4 + 1 > 1024)
utf8str = new uint8[aLength * 4 + 1];
uint8 *utf8ptr = utf8str;
const PRUnichar *uniptr = aString;
for (PRUint32 i = 0; i < aLength; i++) {
convert_to_utf8(utf8ptr, uniptr);
}
*utf8ptr = '\0';
uint32 utf8str_len = strlen(utf8str);
r = GetBoundingMetrics((char *)utf8str, utf8str_len, aBoundingMetrics);
if (utf8str != utf8buf)
delete [] utf8str;
if (nsnull != aFontID)
*aFontID = 0;
}
return r;
}
#endif /* MOZ_MATHML */