NS_IMETHODIMP nsRenderingContextPh :: GetWidth(const char* aString, PRUint32 aLength, nscoord& aWidth )
{
PhRect_t extent;
/* Check for the very common case of trying to get the width of a single space */
if( aString[0] == ' ' && aLength == 1 )
return mFontMetrics->GetSpaceWidth(aWidth);
PfExtent( &extent, NULL, mPhotonFontName, 0L, 0L, aString, aLength, PF_SIMPLE_METRICS, NULL );
aWidth = NSToCoordRound((int) ((extent.lr.x - extent.ul.x + 1) * mP2T));
return NS_OK;
}
NS_IMETHODIMP nsFontMetricsPh::Init ( const nsFont& aFont, nsIAtom* aLangGroup, nsIDeviceContext* aContext )
{
NS_ASSERTION(!(nsnull == aContext), "attempt to init fontmetrics with null device context");
nsAutoString firstFace;
char *str = nsnull;
nsresult result;
PhRect_t extent;
if( !gFontMetricsCache ) {
nsresult res = InitGlobals( );
if( NS_FAILED(res) ) return res;
}
mFont = aFont;
mLangGroup = aLangGroup;
mDeviceContext = aContext;
result = aContext->FirstExistingFont(aFont, firstFace);
str = ToNewCString(firstFace);
#ifdef DEBUG_Adrian
printf( "\n\n\t\t\tIn nsFontMetricsPh::Init str=%s\n", str );
#endif
if( !str || !str[0] )
{
if( str ) free (str);
str = strdup("serif");
}
const char *cstring;
aLangGroup->GetUTF8String( &cstring );
char *prop = PR_smprintf( "font.name.%s.%s", str, cstring );
char *font_default = NULL;
if( prop )
{
gPref->CopyCharPref( prop, &font_default );
PR_smprintf_free( prop );
}
else gPref->CopyCharPref( "font.name.serif.x-western", &font_default );
if( font_default )
{
free (str);
/* font_default was allocated. in CopyCharPref. */
str = font_default;
}
float app2dev;
app2dev = mDeviceContext->AppUnitsToDevUnits();
PRInt32 sizePoints;
if( mFont.systemFont == PR_TRUE )
sizePoints = NSToIntRound( app2dev * mFont.size * 0.68 );
else sizePoints = NSToIntRound( app2dev * mFont.size * 0.74 );
char NSFullFontName[MAX_FONT_TAG];
unsigned int uiFlags = 0L;
if(aFont.weight > NS_FONT_WEIGHT_NORMAL)
uiFlags |= PF_STYLE_BOLD;
if(aFont.style & (NS_FONT_STYLE_ITALIC|NS_FONT_STYLE_OBLIQUE) )
uiFlags |= PF_STYLE_ITALIC;
if(aFont.style & NS_FONT_STYLE_ANTIALIAS)
uiFlags |= PF_STYLE_ANTIALIAS;
if( PfGenerateFontName( (char *)str, uiFlags, sizePoints, (char *)NSFullFontName ) == NULL )
{
#ifdef DEBUG_Adrian
printf( "!!!!!!!!!!!! PfGenerateFontName failed\n" );
#endif
PfGenerateFontName( "TextFont", uiFlags, sizePoints, (char *)NSFullFontName );
}
/* Once the Photon Font String is built get the attributes */
FontQueryInfo *node;
nsCStringKey key((char *)(NSFullFontName));
node = (FontQueryInfo *) gFontMetricsCache->Get(&key);
#ifdef DEBUG_Adrian
printf( "\t\t\tThe generated font name is NSFullFontName=%s\n", NSFullFontName );
if( node ) printf( "\t\t\t( cached ) The real font is desc=%s\n", node->desc );
#endif
if( !node )
{
node = (FontQueryInfo *)calloc(sizeof(FontQueryInfo), 1);
PfQueryFont(NSFullFontName, node);
#ifdef DEBUG_Adrian
printf( "\t\t\t(not cached ) The real font is desc=%s\n", node->desc );
printf( "\tCall PfLoadMetrics for NSFullFontName=%s\n", NSFullFontName );
#endif
gFontMetricsCache->Put(&key, node);
PfLoadMetrics( NSFullFontName );
}
float dev2app;
double height;
nscoord onePixel;
dev2app = mDeviceContext->DevUnitsToAppUnits();
onePixel = NSToCoordRound(1 * dev2app);
height = node->descender - node->ascender;
PfExtent( &extent, NULL, NSFullFontName, 0L, 0L, " ", 1, PF_SIMPLE_METRICS, NULL );
mSpaceWidth = NSToCoordRound((extent.lr.x - extent.ul.x + 1) * dev2app);
mLeading = NSToCoordRound(0);
mEmHeight = NSToCoordRound(height * dev2app);
mEmAscent = NSToCoordRound(node->ascender * dev2app * -1.0);
mEmDescent = NSToCoordRound(node->descender * dev2app);
mHeight = mMaxHeight = NSToCoordRound(height * dev2app);
mAscent = mMaxAscent = NSToCoordRound(node->ascender * dev2app * -1.0);
mDescent = mMaxDescent = NSToCoordRound(node->descender * dev2app);
mMaxAdvance = NSToCoordRound(node->width * dev2app);
mAveCharWidth = mSpaceWidth;
mXHeight = NSToCoordRound((float)node->ascender * dev2app * 0.56f * -1.0); // 56% of ascent, best guess for non-true type
mSuperscriptOffset = mXHeight; // XXX temporary code!
mSubscriptOffset = mXHeight; // XXX temporary code!
mStrikeoutSize = onePixel; // XXX this is a guess
mStrikeoutOffset = NSToCoordRound(mXHeight / 2.0f); // 50% of xHeight
mUnderlineSize = onePixel; // XXX this is a guess
mUnderlineOffset = -NSToCoordRound((float)node->descender * dev2app * 0.30f); // 30% of descent
if (mFontHandle)
free (mFontHandle);
mFontHandle = strdup(NSFullFontName);
free (str);
return NS_OK;
}
