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/*=========================================================================
Program: Visualization Toolkit
Module: vtkFontConfigFreeTypeTools.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "vtkFontConfigFreeTypeTools.h"
#include "vtkMath.h"
#include "vtkObjectFactory.h"
#include "vtkSmartPointer.h"
#include "vtkTextProperty.h"
#ifndef _MSC_VER
# include <stdint.h>
#endif
#include <fontconfig/fontconfig.h>
vtkStandardNewMacro(vtkFontConfigFreeTypeTools)
namespace
{
// The FreeType face requester callback:
FT_CALLBACK_DEF(FT_Error)
vtkFontConfigFreeTypeToolsFaceRequester(FTC_FaceID face_id,
FT_Library lib,
FT_Pointer request_data,
FT_Face* face)
{
// Get a pointer to the current vtkFontConfigFreeTypeTools object
vtkFontConfigFreeTypeTools *self =
reinterpret_cast<vtkFontConfigFreeTypeTools*>(request_data);
// Map the ID to a text property
vtkSmartPointer<vtkTextProperty> tprop =
vtkSmartPointer<vtkTextProperty>::New();
self->MapIdToTextProperty(reinterpret_cast<intptr_t>(face_id), tprop);
bool faceIsSet = self->GetForceCompiledFonts() ?
false : self->LookupFaceFontConfig(tprop, lib, face);
// Fall back to compiled fonts if lookup fails/compiled fonts are forced:
if (!faceIsSet)
{
faceIsSet = self->Superclass::LookupFace(tprop, lib, face);
}
if (!faceIsSet)
{
return static_cast<FT_Error>(1);
}
if ( tprop->GetOrientation() != 0.0 )
{
// FreeType documentation says that the transform should not be set
// but we cache faces also by transform, so that there is a unique
// (face, orientation) cache entry
FT_Matrix matrix;
float angle = vtkMath::RadiansFromDegrees( tprop->GetOrientation() );
matrix.xx = (FT_Fixed)( cos(angle) * 0x10000L);
matrix.xy = (FT_Fixed)(-sin(angle) * 0x10000L);
matrix.yx = (FT_Fixed)( sin(angle) * 0x10000L);
matrix.yy = (FT_Fixed)( cos(angle) * 0x10000L);
FT_Set_Transform(*face, &matrix, NULL);
}
return static_cast<FT_Error>(0);
}
} // end anon namespace
void vtkFontConfigFreeTypeTools::PrintSelf(ostream &os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
}
vtkFontConfigFreeTypeTools::vtkFontConfigFreeTypeTools()
{
}
vtkFontConfigFreeTypeTools::~vtkFontConfigFreeTypeTools()
{
}
FT_Error vtkFontConfigFreeTypeTools::CreateFTCManager()
{
return FTC_Manager_New(*this->GetLibrary(),
this->MaximumNumberOfFaces,
this->MaximumNumberOfSizes,
this->MaximumNumberOfBytes,
vtkFontConfigFreeTypeToolsFaceRequester,
static_cast<FT_Pointer>(this),
this->CacheManager);
}
bool vtkFontConfigFreeTypeTools::LookupFaceFontConfig(vtkTextProperty *tprop,
FT_Library lib,
FT_Face *face)
{
if (!FcInit())
{
return false;
}
// Query tprop
const FcChar8 *family = reinterpret_cast<const FcChar8*>(
tprop->GetFontFamilyAsString());
const double pointSize = static_cast<double>(tprop->GetFontSize());
const int weight = tprop->GetBold() ? FC_WEIGHT_BOLD : FC_WEIGHT_MEDIUM;
const int slant = tprop->GetItalic() ? FC_SLANT_ITALIC : FC_SLANT_ROMAN;
// Build pattern
FcPattern *pattern = FcPatternCreate();
FcPatternAddString(pattern, FC_FAMILY, family);
FcPatternAddDouble(pattern, FC_SIZE, pointSize);
FcPatternAddInteger(pattern, FC_WEIGHT, weight);
FcPatternAddInteger(pattern, FC_SLANT, slant);
FcPatternAddBool(pattern, FC_SCALABLE, true);
// Replace common font names, e.g. arial, times, etc -> sans, serif, etc
FcConfigSubstitute(NULL, pattern, FcMatchPattern);
// Fill in any missing defaults:
FcDefaultSubstitute(pattern);
// Match pattern
FcResult result;
FcFontSet *fontMatches = FcFontSort(NULL, pattern, false, NULL, &result);
FcPatternDestroy(pattern);
pattern = NULL;
if (!fontMatches || fontMatches->nfont == 0)
{
if (fontMatches)
FcFontSetDestroy(fontMatches);
return false;
}
// Grab the first match that is scalable -- even though we've requested
// scalable fonts in the match, FC seems to not weigh that option very heavily
FcPattern *match = NULL;
for (int i = 0; i < fontMatches->nfont; ++i)
{
match = fontMatches->fonts[i];
FcBool isScalable;
FcPatternGetBool(match, FC_SCALABLE, 0, &isScalable);
if (!isScalable)
continue;
else
break;
}
if (!match)
{
FcFontSetDestroy(fontMatches);
return false;
}
// Get filename. Do not free the filename string -- it is owned by FcPattern
// "match". Likewise, do not use the filename after match is freed.
FcChar8 *filename;
result = FcPatternGetString(match, FC_FILE, 0, &filename);
FT_Error error = FT_New_Face(lib, reinterpret_cast<const char*>(filename), 0,
face);
if (error)
{
FcFontSetDestroy(fontMatches);
return false;
}
FcFontSetDestroy(fontMatches);
fontMatches = NULL;
return true;
}
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