internal static int GetGdiCompatibleMetrics(
IntPtr _fontFace,
float emSize,
float pixels_per_dip,
DWriteMatrix transform,
out FontMetrics metrics)
{
var GetGdiCompatibleMetricsFn = GetFunctionFromVTable <Delegate_GetGdiCompatibleMetrics>(_fontFace, 16);
return(GetGdiCompatibleMetricsFn(_fontFace, emSize, pixels_per_dip, ref transform, out metrics));
}
public static DWriteMatrix GetIdentityTransform()
{
DWriteMatrix transform = new DWriteMatrix();
transform.M11 = 1;
transform.M12 = 0;
transform.M22 = 1;
transform.M21 = 0;
transform.Dx = 0;
transform.Dy = 0;
return(transform);
}
public FontMetrics DisplayMetrics(float emSize, float pixelsPerDip)
{
FontMetrics fontMetrics;
IntPtr fontFace = _font.CreateFontFace();
try {
DWriteMatrix transform = Factory.GetIdentityTransform();
FontFace.GetGdiCompatibleMetrics(
fontFace,
emSize,
pixelsPerDip,
transform,
out fontMetrics
);
return(fontMetrics);
}
finally
{
Marshal.Release(fontFace);
}
}
unsafe public void GetGlyphPlacements(
IntPtr textString,
ushort *clusterMap, /* textLength */
ushort *textProps, /* textLength */
uint textLength,
ushort *glyphIndices, /* glyphCount */
ushort *glyphProps, /* glyphCount */
uint glyphCount,
Font font,
double fontEmSize,
double scalingFactor,
bool isSideways,
bool isRightToLeft,
CultureInfo cultureInfo,
DWriteFontFeature[][] features,
uint[] featureRangeLengths,
TextFormattingMode textFormattingMode,
ItemProps itemProps,
float pixelsPerDip,
int *glyphAdvances, /* glyphCount */
[Out] out GlyphOffset[] glyphOffsets
)
{
// Shaping should not have taken place if ScriptAnalysis is NULL!
Debug.Assert(itemProps.ScriptAnalysis != null);
// These are control characters and WPF will not display control characters.
if (GetScriptShapes(itemProps) != DWriteScriptShapes.Default)
{
GetGlyphPlacementsForControlCharacters(
textString,
textLength,
font,
textFormattingMode,
fontEmSize,
scalingFactor,
isSideways,
pixelsPerDip,
glyphCount,
glyphIndices,
glyphAdvances,
out glyphOffsets
);
}
else
{
float[] dwriteGlyphAdvances = new float[glyphCount];
DWriteGlyphOffset[] dwriteGlyphOffsets = null;
var featureRangeLengthsNonNull = featureRangeLengths != null ? featureRangeLengths : new uint[0];
fixed(uint *pFeatureRangeLengthsPinned = featureRangeLengthsNonNull)
{
GCHandle[] dwriteFontFeaturesGCHandles = null;
uint featureRanges = 0;
IntPtr[] dwriteTypographicFeatures = null;
IntPtr dwriteTypographicFeaturesMemory = IntPtr.Zero;
uint * pFeatureRangeLengths = null;
if (features != null)
{
pFeatureRangeLengths = pFeatureRangeLengthsPinned;
featureRanges = (uint)featureRangeLengths.Length;
dwriteTypographicFeatures = new IntPtr[featureRanges];
dwriteFontFeaturesGCHandles = new GCHandle[featureRanges];
dwriteTypographicFeatures = new IntPtr[featureRanges];
dwriteTypographicFeaturesMemory = Marshal.AllocCoTaskMem(Marshal.SizeOf <DWriteTypographicFeatures>() * (int)featureRanges);
}
FontFace fontFace = font.GetFontFace();
IntPtr scriptAnalysis = itemProps.ScriptAnalysisCoTaskMem();
try
{
string localeName = cultureInfo.IetfLanguageTag;
DWriteMatrix transform = Factory.GetIdentityTransform();
if (features != null)
{
for (uint i = 0; i < featureRanges; ++i)
{
dwriteFontFeaturesGCHandles[i] = GCHandle.Alloc(features[i], GCHandleType.Pinned);
var new_feature = new DWriteTypographicFeatures();
new_feature.features = dwriteFontFeaturesGCHandles[i].AddrOfPinnedObject();
new_feature.featureCount = features[i].Length;
dwriteTypographicFeatures[i] = dwriteTypographicFeaturesMemory + (int)i * Marshal.SizeOf <DWriteTypographicFeatures>();
Marshal.StructureToPtr <DWriteTypographicFeatures>(new_feature, dwriteTypographicFeatures[i], false);
}
}
float fontEmSizeFloat = (float)fontEmSize;
dwriteGlyphOffsets = new DWriteGlyphOffset[glyphCount];
if (textFormattingMode == TextFormattingMode.Ideal)
{
try {
_textAnalyzer.GetGlyphPlacements(
textString,
clusterMap,
textProps,
textLength,
glyphIndices,
glyphProps,
glyphCount,
fontFace.DWriteFontFaceNoAddRef,
fontEmSizeFloat,
isSideways,
isRightToLeft,
scriptAnalysis,
localeName,
dwriteTypographicFeatures,
pFeatureRangeLengths,
featureRanges,
dwriteGlyphAdvances,
dwriteGlyphOffsets
);
}
catch (ArgumentException)
{
// If pLocaleName is unsupported (e.g. "prs-af"), DWrite returns E_INVALIDARG.
// Try again with the default mapping.
_textAnalyzer.GetGlyphPlacements(
textString,
clusterMap,
textProps,
textLength,
glyphIndices,
glyphProps,
glyphCount,
fontFace.DWriteFontFaceNoAddRef,
fontEmSizeFloat,
isSideways,
isRightToLeft,
scriptAnalysis,
null,
dwriteTypographicFeatures,
pFeatureRangeLengths,
featureRanges,
dwriteGlyphAdvances,
dwriteGlyphOffsets
);
}
}
else
{
Debug.Assert(textFormattingMode == TextFormattingMode.Display);
try {
_textAnalyzer.GetGdiCompatibleGlyphPlacements(
textString,
clusterMap,
textProps,
textLength,
glyphIndices,
glyphProps,
glyphCount,
fontFace.DWriteFontFaceNoAddRef,
fontEmSizeFloat,
pixelsPerDip,
ref transform,
false,
isSideways,
isRightToLeft,
scriptAnalysis,
localeName,
dwriteTypographicFeatures,
pFeatureRangeLengths,
featureRanges,
dwriteGlyphAdvances,
dwriteGlyphOffsets
);
}
catch (ArgumentException) {
// If pLocaleName is unsupported (e.g. "prs-af"), DWrite returns E_INVALIDARG.
// Try again with the default mapping.
_textAnalyzer.GetGdiCompatibleGlyphPlacements(
textString,
clusterMap,
textProps,
textLength,
glyphIndices,
glyphProps,
glyphCount,
fontFace.DWriteFontFaceNoAddRef,
fontEmSizeFloat,
pixelsPerDip,
ref transform,
false,
isSideways,
isRightToLeft,
scriptAnalysis,
null,
dwriteTypographicFeatures,
pFeatureRangeLengths,
featureRanges,
dwriteGlyphAdvances,
dwriteGlyphOffsets
);
}
}
glyphOffsets = new GlyphOffset[glyphCount];
if (textFormattingMode == TextFormattingMode.Ideal)
{
for (uint i = 0; i < glyphCount; ++i)
{
glyphAdvances[i] = (int)Math.Round(dwriteGlyphAdvances[i] * fontEmSize * scalingFactor / fontEmSizeFloat);
glyphOffsets[i].du = (int)(dwriteGlyphOffsets[i].AdvanceOffset * scalingFactor);
glyphOffsets[i].dv = (int)(dwriteGlyphOffsets[i].AscenderOffset * scalingFactor);
}
}
else
{
for (uint i = 0; i < glyphCount; ++i)
{
glyphAdvances[i] = (int)Math.Round(dwriteGlyphAdvances[i] * scalingFactor);
glyphOffsets[i].du = (int)(dwriteGlyphOffsets[i].AdvanceOffset * scalingFactor);
glyphOffsets[i].dv = (int)(dwriteGlyphOffsets[i].AscenderOffset * scalingFactor);
}
}
}
finally
{
Marshal.FreeCoTaskMem(scriptAnalysis);
if (features != null)
{
for (uint i = 0; i < featureRanges; ++i)
{
dwriteFontFeaturesGCHandles[i].Free();
}
Marshal.FreeCoTaskMem(dwriteTypographicFeaturesMemory);
}
fontFace.Release();
}
}
}
}
