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295 lines
11 KiB
295 lines
11 KiB
// TeXFont_PFB.cpp
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//
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// Part of KDVI - A DVI previewer for the KDE desktop environemt
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//
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// (C) 2003 Stefan Kebekus
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// Distributed under the GPL
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// This file is compiled only if the FreeType library is present on
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// the system
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// Add header files alphabetically
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#include <config.h>
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#include <kdebug.h>
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#include <klocale.h>
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#include <tqimage.h>
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#include "fontpool.h"
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#ifdef HAVE_FREETYPE
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#include "glyph.h"
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#include "TeXFont_PFB.h"
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//#define DEBUG_PFB 1
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TeXFont_PFB::TeXFont_PFB(TeXFontDefinition *tqparent, fontEncoding *enc, double slant)
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: TeXFont(tqparent)
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{
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#ifdef DEBUG_PFB
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if (enc != 0)
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kdDebug(4300) << "TeXFont_PFB::TeXFont_PFB( tqparent=" << tqparent << ", encoding=" << enc->encodingFullName << " )" << endl;
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else
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kdDebug(4300) << "TeXFont_PFB::TeXFont_PFB( tqparent=" << tqparent << ", encoding=0 )" << endl;
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#endif
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fatalErrorInFontLoading = false;
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int error = FT_New_Face( tqparent->font_pool->FreeType_library, tqparent->filename.local8Bit(), 0, &face );
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if ( error == FT_Err_Unknown_File_Format ) {
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errorMessage = i18n("The font file %1 could be opened and read, but its font format is unsupported.").tqarg(tqparent->filename);
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kdError(4300) << errorMessage << endl;
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fatalErrorInFontLoading = true;
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return;
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} else
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if ( error ) {
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errorMessage = i18n("The font file %1 is broken, or it could not be opened or read.").tqarg(tqparent->filename);
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kdError(4300) << errorMessage << endl;
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fatalErrorInFontLoading = true;
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return;
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}
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// Take care of slanting, and transform all characters in the font, if necessary.
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if (slant != 0.0) {
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// Construct a transformation matrix for vertical shear which will
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// be used to transform the characters.
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transformationMatrix.xx = 0x10000;
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transformationMatrix.xy = (FT_Fixed)(slant * 0x10000);
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transformationMatrix.yx = 0;
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transformationMatrix.yy = 0x10000;
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FT_Set_Transform( face, &transformationMatrix, 0);
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}
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if (face->family_name != 0)
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tqparent->fullFontName = face->family_name;
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// Finally, we need to set up the charMap array, which maps TeX
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// character codes to glyph indices in the font. (Remark: the
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// charMap, and the font encoding procedure is necessary, because
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// TeX is only able to address character codes 0-255 while
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// e.g. Type1 fonts may contain several thousands of characters)
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if (enc != 0) {
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tqparent->fullEncodingName = enc->encodingFullName.remove(TQString::tqfromLatin1( "Encoding" ));
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tqparent->fullEncodingName = enc->encodingFullName.remove(TQString::tqfromLatin1( "encoding" ));
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// An encoding vector is given for this font, i.e. an array of
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// character names (such as: 'parenleft' or 'dotlessj'). We use
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// the FreeType library function 'FT_Get_Name_Index()' to
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// associate glyph indices to those names.
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#ifdef DEBUG_PFB
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kdDebug(4300) << "Trying to associate glyph indices to names from the encoding vector." << endl;
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#endif
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for(int i=0; i<256; i++) {
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charMap[i] = FT_Get_Name_Index( face, (FT_String *)(enc->glyphNameVector[i].ascii()) );
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#ifdef DEBUG_PFB
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kdDebug(4300) << i << ": " << enc->glyphNameVector[i] << ", GlyphIndex=" << charMap[i] << endl;
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#endif
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}
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} else {
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// If there is no encoding vector available, we check if the font
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// itself contains a charmap that could be used. An admissible
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// charMap will be stored under platform_id=7 and encoding_id=2.
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FT_CharMap found = 0;
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for (int n = 0; n<face->num_charmaps; n++ ) {
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FT_CharMap charmap = face->charmaps[n];
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if ( charmap->platform_id == 7 && charmap->encoding_id == 2 ) {
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found = charmap;
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break;
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}
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}
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if ((found != 0) && (FT_Set_Charmap( face, found ) == 0)) {
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// Feed the charMap array with the charmap data found in the
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// previous step.
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#ifdef DEBUG_PFB
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kdDebug(4300) << "No encoding given: using charmap platform=7, encoding=2 that is contained in the font." << endl;
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#endif
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for(int i=0; i<256; i++)
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charMap[i] = FT_Get_Char_Index( face, i );
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} else {
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if ((found == 0) && (face->charmap != 0)) {
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#ifdef DEBUG_PFB
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kdDebug(4300) << "No encoding given: using charmap platform=" << face->charmap->platform_id <<
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", encoding=" << face->charmap->encoding_id << " that is contained in the font." << endl;
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#endif
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for(int i=0; i<256; i++)
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charMap[i] = FT_Get_Char_Index( face, i );
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} else {
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// As a last resort, we use the identity map.
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#ifdef DEBUG_PFB
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kdDebug(4300) << "No encoding given, no suitable charmaps found in the font: using identity charmap." << endl;
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#endif
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for(int i=0; i<256; i++)
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charMap[i] = i;
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}
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}
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}
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}
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TeXFont_PFB::~TeXFont_PFB()
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{
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FT_Done_Face( face );
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}
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glyph *TeXFont_PFB::getGlyph(TQ_UINT16 ch, bool generateCharacterPixmap, const TQColor& color)
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{
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#ifdef DEBUG_PFB
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kdDebug(4300) << "TeXFont_PFB::getGlyph( ch=" << ch << ", '" << (char)(ch) << "', generateCharacterPixmap=" << generateCharacterPixmap << " )" << endl;
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#endif
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// Paranoia checks
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if (ch >= TeXFontDefinition::max_num_of_chars_in_font) {
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kdError(4300) << "TeXFont_PFB::getGlyph(): Argument is too big." << endl;
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return glyphtable;
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}
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// This is the address of the glyph that will be returned.
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struct glyph *g = glyphtable+ch;
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if (fatalErrorInFontLoading == true)
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return g;
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if ((generateCharacterPixmap == true) && ((g->shrunkenCharacter.isNull()) || (color != g->color)) ) {
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int error;
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unsigned int res = (unsigned int)(tqparent->displayResolution_in_dpi/tqparent->enlargement +0.5);
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g->color = color;
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// Character height in 1/64th of points (reminder: 1 pt = 1/72 inch)
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// Only approximate, may vary from file to file!!!! @@@@@
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long int characterSize_in_printers_points_by_64 = (long int)((64.0*72.0*tqparent->scaled_size_in_DVI_units*tqparent->font_pool->getCMperDVIunit())/2.54 + 0.5 );
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error = FT_Set_Char_Size(face, 0, characterSize_in_printers_points_by_64, res, res );
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if (error) {
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TQString msg = i18n("FreeType reported an error when setting the character size for font file %1.").tqarg(tqparent->filename);
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if (errorMessage.isEmpty())
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errorMessage = msg;
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kdError(4300) << msg << endl;
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g->shrunkenCharacter.resize(1,1);
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g->shrunkenCharacter.fill(TQColor(255, 255, 255));
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return g;
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}
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// load glyph image into the slot and erase the previous one
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if (tqparent->font_pool->getUseFontHints() == true)
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error = FT_Load_Glyph(face, charMap[ch], FT_LOAD_DEFAULT );
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else
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error = FT_Load_Glyph(face, charMap[ch], FT_LOAD_NO_HINTING );
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if (error) {
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TQString msg = i18n("FreeType is unable to load glyph #%1 from font file %2.").tqarg(ch).tqarg(tqparent->filename);
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if (errorMessage.isEmpty())
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errorMessage = msg;
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kdError(4300) << msg << endl;
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g->shrunkenCharacter.resize(1,1);
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g->shrunkenCharacter.fill(TQColor(255, 255, 255));
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return g;
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}
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// convert to an anti-aliased bitmap
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error = FT_Render_Glyph( face->glyph, ft_render_mode_normal );
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if (error) {
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TQString msg = i18n("FreeType is unable to render glyph #%1 from font file %2.").tqarg(ch).tqarg(tqparent->filename);
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if (errorMessage.isEmpty())
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errorMessage = msg;
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kdError(4300) << msg << endl;
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g->shrunkenCharacter.resize(1,1);
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g->shrunkenCharacter.fill(TQColor(255, 255, 255));
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return g;
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}
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FT_GlyphSlot slot = face->glyph;
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if ((slot->bitmap.width == 0) || (slot->bitmap.rows == 0)) {
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if (errorMessage.isEmpty())
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errorMessage = i18n("Glyph #%1 is empty.").tqarg(ch);
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kdError(4300) << i18n("Glyph #%1 from font file %2 is empty.").tqarg(ch).tqarg(tqparent->filename) << endl;
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g->shrunkenCharacter.resize( 15, 15 );
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g->shrunkenCharacter.fill(TQColor(255, 0, 0));
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g->x2 = 0;
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g->y2 = 15;
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} else {
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TQImage imgi(slot->bitmap.width, slot->bitmap.rows, 32);
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imgi.setAlphaBuffer(true);
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// Do TQPixmaps fully support the alpha channel? If yes, we use
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// that. Otherwise, use other routines as a fallback
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if (tqparent->font_pool->TQPixmapSupportsAlpha) {
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// If the alpha channel is properly supported, we set the
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// character glyph to a colored rectangle, and define the
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// character outline only using the alpha channel. That
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// ensures good quality rendering for overlapping characters.
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uchar *srcScanLine = slot->bitmap.buffer;
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for(int row=0; row<slot->bitmap.rows; row++) {
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uchar *destScanLine = imgi.scanLine(row);
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for(int col=0; col<slot->bitmap.width; col++) {
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destScanLine[4*col+0] = color.blue();
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destScanLine[4*col+1] = color.green();
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destScanLine[4*col+2] = color.red();
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destScanLine[4*col+3] = srcScanLine[col];
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}
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srcScanLine += slot->bitmap.pitch;
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}
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} else {
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// If the alpha channel is not supported... QT seems to turn
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// the alpha channel into a crude bitmap which is used to tqmask
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// the resulting TQPixmap. In this case, we define the
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// character outline using the image data, and use the alpha
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// channel only to store "maximally opaque" or "completely
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// transparent" values. When characters are rendered,
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// overlapping characters are no longer correctly drawn, but
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// quality is still sufficient for most purposes. One notable
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// exception is output from the gftodvi program, which will be
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// partially unreadable.
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TQ_UINT16 rInv = 0xFF - color.red();
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TQ_UINT16 gInv = 0xFF - color.green();
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TQ_UINT16 bInv = 0xFF - color.blue();
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for(TQ_UINT16 y=0; y<slot->bitmap.rows; y++) {
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TQ_UINT8 *srcScanLine = slot->bitmap.buffer + y*slot->bitmap.pitch;
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unsigned int *destScanLine = (unsigned int *)imgi.scanLine(y);
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for(TQ_UINT16 col=0; col<slot->bitmap.width; col++) {
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TQ_UINT16 data = *srcScanLine;
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// The value stored in "data" now has the following meaning:
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// data = 0 -> white; data = 0xff -> use "color"
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*destScanLine = tqRgba(0xFF - (rInv*data + 0x7F) / 0xFF,
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0xFF - (gInv*data + 0x7F) / 0xFF,
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0xFF - (bInv*data + 0x7F) / 0xFF,
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(data > 0x03) ? 0xff : 0x00);
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destScanLine++;
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srcScanLine++;
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}
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}
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}
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g->shrunkenCharacter.convertFromImage (imgi, 0);
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g->x2 = -slot->bitmap_left;
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g->y2 = slot->bitmap_top;
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}
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}
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// Load glyph width, if that hasn't been done yet.
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if (g->dvi_advance_in_units_of_design_size_by_2e20 == 0) {
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int error = FT_Load_Glyph(face, charMap[ch], FT_LOAD_NO_SCALE);
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if (error) {
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TQString msg = i18n("FreeType is unable to load metric for glyph #%1 from font file %2.").tqarg(ch).tqarg(tqparent->filename);
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if (errorMessage.isEmpty())
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errorMessage = msg;
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kdError(4300) << msg << endl;
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g->dvi_advance_in_units_of_design_size_by_2e20 = 1;
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}
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g->dvi_advance_in_units_of_design_size_by_2e20 = (TQ_INT32)(((TQ_INT64)(1<<20) * (TQ_INT64)face->glyph->metrics.horiAdvance) / (TQ_INT64)face->units_per_EM);
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}
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return g;
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}
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#endif // HAVE_FREETYPE
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