Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.

BUG:215923


git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdegraphics@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

1 files changed, 294 insertions, 0 deletions

diff --git a/kdvi/TeXFont_PFB.cpp b/kdvi/TeXFont_PFB.cpp
new file mode 100644
index 00000000..927c84bc
--- /dev/null
+++ b/kdvi/TeXFont_PFB.cpp
@@ -0,0 +1,294 @@
+// TeXFont_PFB.cpp
+//
+// Part of KDVI - A DVI previewer for the KDE desktop environemt 
+//
+// (C) 2003 Stefan Kebekus
+// Distributed under the GPL
+
+// This file is compiled only if the FreeType library is present on
+// the system
+
+// Add header files alphabetically
+
+#include <config.h>
+
+#include <kdebug.h>
+#include <klocale.h>
+#include <qimage.h>
+
+#include "fontpool.h"
+
+#ifdef HAVE_FREETYPE
+
+#include "glyph.h"
+#include "TeXFont_PFB.h"
+
+//#define DEBUG_PFB 1
+
+
+TeXFont_PFB::TeXFont_PFB(TeXFontDefinition *parent, fontEncoding *enc, double slant)
+  : TeXFont(parent)
+{
+#ifdef DEBUG_PFB
+  if (enc != 0)
+    kdDebug(4300) << "TeXFont_PFB::TeXFont_PFB( parent=" << parent << ", encoding=" << enc->encodingFullName << " )" << endl;
+  else
+    kdDebug(4300) << "TeXFont_PFB::TeXFont_PFB( parent=" << parent << ", encoding=0 )" << endl;
+#endif
+
+  fatalErrorInFontLoading = false;
+
+  int error = FT_New_Face( parent->font_pool->FreeType_library, parent->filename.local8Bit(), 0, &face );
+  
+  if ( error == FT_Err_Unknown_File_Format ) {
+    errorMessage = i18n("The font file %1 could be opened and read, but its font format is unsupported.").arg(parent->filename);
+    kdError(4300) << errorMessage << endl;
+    fatalErrorInFontLoading = true;
+    return;
+  } else 
+    if ( error ) {
+      errorMessage = i18n("The font file %1 is broken, or it could not be opened or read.").arg(parent->filename);
+      kdError(4300) << errorMessage << endl;
+      fatalErrorInFontLoading = true;
+      return;
+    }
+
+  // Take care of slanting, and transform all characters in the font, if necessary.
+  if (slant != 0.0) {
+    // Construct a transformation matrix for vertical shear which will
+    // be used to transform the characters.
+    transformationMatrix.xx = 0x10000;
+    transformationMatrix.xy = (FT_Fixed)(slant * 0x10000);
+    transformationMatrix.yx = 0;
+    transformationMatrix.yy = 0x10000;
+    
+    FT_Set_Transform( face, &transformationMatrix, 0);
+  }
+  
+  if (face->family_name != 0)
+    parent->fullFontName = face->family_name;
+
+  // Finally, we need to set up the charMap array, which maps TeX
+  // character codes to glyph indices in the font. (Remark: the
+  // charMap, and the font encoding procedure is necessary, because
+  // TeX is only able to address character codes 0-255 while
+  // e.g. Type1 fonts may contain several thousands of characters)
+  if (enc != 0) {
+    parent->fullEncodingName = enc->encodingFullName.remove(QString::fromLatin1( "Encoding" ));
+    parent->fullEncodingName = enc->encodingFullName.remove(QString::fromLatin1( "encoding" ));
+
+    // An encoding vector is given for this font, i.e. an array of
+    // character names (such as: 'parenleft' or 'dotlessj'). We use
+    // the FreeType library function 'FT_Get_Name_Index()' to
+    // associate glyph indices to those names.
+#ifdef DEBUG_PFB
+    kdDebug(4300) << "Trying to associate glyph indices to names from the encoding vector." << endl;
+#endif
+    for(int i=0; i<256; i++) {
+      charMap[i] = FT_Get_Name_Index( face, (FT_String *)(enc->glyphNameVector[i].ascii()) );
+#ifdef DEBUG_PFB
+      kdDebug(4300) << i << ": " << enc->glyphNameVector[i] << ", GlyphIndex=" <<  charMap[i] << endl;
+#endif
+    }
+  } else {
+    // If there is no encoding vector available, we check if the font
+    // itself contains a charmap that could be used. An admissible
+    // charMap will be stored under platform_id=7 and encoding_id=2.
+    FT_CharMap  found = 0;
+    for (int n = 0; n<face->num_charmaps; n++ ) {
+      FT_CharMap charmap = face->charmaps[n];
+      if ( charmap->platform_id == 7 && charmap->encoding_id == 2 ) {
+	found = charmap;
+	break;
+      }
+    }
+    
+    if ((found != 0) && (FT_Set_Charmap( face, found ) == 0)) {
+      // Feed the charMap array with the charmap data found in the
+      // previous step.
+#ifdef DEBUG_PFB
+      kdDebug(4300) << "No encoding given: using charmap platform=7, encoding=2 that is contained in the font." << endl;
+#endif
+      for(int i=0; i<256; i++) 
+	charMap[i] = FT_Get_Char_Index( face, i );
+    } else {
+      if ((found == 0) && (face->charmap != 0)) {
+#ifdef DEBUG_PFB
+	kdDebug(4300) << "No encoding given: using charmap platform=" << face->charmap->platform_id <<
+	  ", encoding=" << face->charmap->encoding_id << " that is contained in the font." << endl;
+#endif
+	for(int i=0; i<256; i++) 
+	  charMap[i] = FT_Get_Char_Index( face, i );
+      } else {
+	// As a last resort, we use the identity map.
+#ifdef DEBUG_PFB
+	kdDebug(4300) << "No encoding given, no suitable charmaps found in the font: using identity charmap." << endl;
+#endif
+	for(int i=0; i<256; i++) 
+	  charMap[i] = i;
+      }
+    }
+  }
+}
+
+
+TeXFont_PFB::~TeXFont_PFB()
+{
+  FT_Done_Face( face );
+}
+
+
+glyph *TeXFont_PFB::getGlyph(Q_UINT16 ch, bool generateCharacterPixmap, const QColor& color)
+{
+#ifdef DEBUG_PFB
+  kdDebug(4300) << "TeXFont_PFB::getGlyph( ch=" << ch << ", '" << (char)(ch) << "', generateCharacterPixmap=" << generateCharacterPixmap << " )" << endl;
+#endif
+  
+  // Paranoia checks
+  if (ch >= TeXFontDefinition::max_num_of_chars_in_font) {
+    kdError(4300) << "TeXFont_PFB::getGlyph(): Argument is too big." << endl;
+    return glyphtable;
+  }
+
+  // This is the address of the glyph that will be returned.
+  struct glyph *g = glyphtable+ch;
+
+
+  if (fatalErrorInFontLoading == true)
+    return g;
+  
+  if ((generateCharacterPixmap == true) && ((g->shrunkenCharacter.isNull()) || (color != g->color)) ) {
+    int error;
+    unsigned int res =  (unsigned int)(parent->displayResolution_in_dpi/parent->enlargement +0.5);
+    g->color = color;
+
+    // Character height in 1/64th of points (reminder: 1 pt = 1/72 inch)
+    // Only approximate, may vary from file to file!!!! @@@@@
+
+    long int characterSize_in_printers_points_by_64 = (long int)((64.0*72.0*parent->scaled_size_in_DVI_units*parent->font_pool->getCMperDVIunit())/2.54 + 0.5 ); 
+    error = FT_Set_Char_Size(face, 0, characterSize_in_printers_points_by_64, res, res );
+    if (error) {
+      QString msg = i18n("FreeType reported an error when setting the character size for font file %1.").arg(parent->filename);
+      if (errorMessage.isEmpty())
+	errorMessage = msg;
+      kdError(4300) << msg << endl;
+      g->shrunkenCharacter.resize(1,1);
+      g->shrunkenCharacter.fill(QColor(255, 255, 255));
+      return g;
+    }
+    
+    // load glyph image into the slot and erase the previous one
+    if (parent->font_pool->getUseFontHints() == true)
+      error = FT_Load_Glyph(face, charMap[ch], FT_LOAD_DEFAULT ); 
+    else
+      error = FT_Load_Glyph(face, charMap[ch], FT_LOAD_NO_HINTING );
+
+    if (error) {
+      QString msg = i18n("FreeType is unable to load glyph #%1 from font file %2.").arg(ch).arg(parent->filename);
+      if (errorMessage.isEmpty())
+	errorMessage = msg;
+      kdError(4300) << msg << endl;
+      g->shrunkenCharacter.resize(1,1);
+      g->shrunkenCharacter.fill(QColor(255, 255, 255));
+      return g;
+    }
+    
+    // convert to an anti-aliased bitmap
+    error = FT_Render_Glyph( face->glyph, ft_render_mode_normal );
+    if (error) {
+      QString msg = i18n("FreeType is unable to render glyph #%1 from font file %2.").arg(ch).arg(parent->filename);
+      if (errorMessage.isEmpty())
+	errorMessage = msg;
+      kdError(4300) << msg << endl;
+      g->shrunkenCharacter.resize(1,1);
+      g->shrunkenCharacter.fill(QColor(255, 255, 255));
+      return g;
+    }
+    
+    FT_GlyphSlot slot = face->glyph;
+
+    if ((slot->bitmap.width == 0) || (slot->bitmap.rows == 0)) {
+      if (errorMessage.isEmpty())
+	errorMessage = i18n("Glyph #%1 is empty.").arg(ch);
+      kdError(4300) << i18n("Glyph #%1 from font file %2 is empty.").arg(ch).arg(parent->filename) << endl;
+      g->shrunkenCharacter.resize( 15, 15 );
+      g->shrunkenCharacter.fill(QColor(255, 0, 0));
+      g->x2 = 0;
+      g->y2 = 15;
+    } else {
+      QImage imgi(slot->bitmap.width, slot->bitmap.rows, 32);
+      imgi.setAlphaBuffer(true);
+
+      // Do QPixmaps fully support the alpha channel? If yes, we use
+      // that. Otherwise, use other routines as a fallback
+      if (parent->font_pool->QPixmapSupportsAlpha) {
+	// If the alpha channel is properly supported, we set the
+	// character glyph to a colored rectangle, and define the
+	// character outline only using the alpha channel. That
+	// ensures good quality rendering for overlapping characters.
+	uchar *srcScanLine = slot->bitmap.buffer;
+	for(int row=0; row<slot->bitmap.rows; row++) {
+	  uchar *destScanLine = imgi.scanLine(row);
+	  for(int col=0; col<slot->bitmap.width; col++) {
+	    destScanLine[4*col+0] = color.blue();
+	    destScanLine[4*col+1] = color.green();
+	    destScanLine[4*col+2] = color.red();
+	    destScanLine[4*col+3] = srcScanLine[col];
+	  }
+	  srcScanLine += slot->bitmap.pitch;
+	}
+      } else {
+	// If the alpha channel is not supported... QT seems to turn
+	// the alpha channel into a crude bitmap which is used to mask
+	// the resulting QPixmap. In this case, we define the
+	// character outline using the image data, and use the alpha
+	// channel only to store "maximally opaque" or "completely
+	// transparent" values. When characters are rendered,
+	// overlapping characters are no longer correctly drawn, but
+	// quality is still sufficient for most purposes. One notable
+	// exception is output from the gftodvi program, which will be
+	// partially unreadable.
+	Q_UINT16 rInv = 0xFF - color.red();
+	Q_UINT16 gInv = 0xFF - color.green();
+	Q_UINT16 bInv = 0xFF - color.blue();
+	
+	for(Q_UINT16 y=0; y<slot->bitmap.rows; y++) {
+	  Q_UINT8 *srcScanLine = slot->bitmap.buffer + y*slot->bitmap.pitch;
+	  unsigned int *destScanLine = (unsigned int *)imgi.scanLine(y);
+	  for(Q_UINT16 col=0; col<slot->bitmap.width; col++) {
+	    Q_UINT16 data =  *srcScanLine;
+	    // The value stored in "data" now has the following meaning:
+	    // data = 0 -> white; data = 0xff -> use "color"
+	    *destScanLine = qRgba(0xFF - (rInv*data + 0x7F) / 0xFF,
+				  0xFF - (gInv*data + 0x7F) / 0xFF,
+				  0xFF - (bInv*data + 0x7F) / 0xFF,
+				  (data > 0x03) ? 0xff : 0x00);
+	    destScanLine++;
+	    srcScanLine++;
+	  }
+	}
+      }
+      
+      g->shrunkenCharacter.convertFromImage (imgi, 0);
+      g->x2 = -slot->bitmap_left;
+      g->y2 = slot->bitmap_top;
+    }
+  }
+  
+  // Load glyph width, if that hasn't been done yet.
+  if (g->dvi_advance_in_units_of_design_size_by_2e20 == 0) {
+    int error = FT_Load_Glyph(face, charMap[ch], FT_LOAD_NO_SCALE);
+    if (error) {
+      QString msg = i18n("FreeType is unable to load metric for glyph #%1 from font file %2.").arg(ch).arg(parent->filename);
+      if (errorMessage.isEmpty())
+	errorMessage = msg;
+      kdError(4300) << msg << endl;
+      g->dvi_advance_in_units_of_design_size_by_2e20 =  1;
+    }
+    g->dvi_advance_in_units_of_design_size_by_2e20 =  (Q_INT32)(((Q_INT64)(1<<20) * (Q_INT64)face->glyph->metrics.horiAdvance) / (Q_INT64)face->units_per_EM);
+  }
+  
+  return g;
+}
+
+#endif // HAVE_FREETYPE