mirror of
https://invent.kde.org/graphics/okular
synced 2024-08-25 02:45:38 +00:00
![Frederik Gladhorn](/assets/img/avatar_default.png)
Seems like kDebug doesn't spam the user, so this needs to use qCDebug.
This reverts commit 34fbdf8c85
.
292 lines
11 KiB
C++
292 lines
11 KiB
C++
// -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil; c-brace-offset: 0; -*-
|
|
// TeXFont_PFB.cpp
|
|
//
|
|
// Part of KDVI - A DVI previewer for the KDE desktop environment
|
|
//
|
|
// (C) 2003 Stefan Kebekus
|
|
// Distributed under the GPL
|
|
|
|
// This file is compiled only if the FreeType library is present on
|
|
// the system
|
|
|
|
#include <config.h>
|
|
|
|
#ifdef HAVE_FREETYPE
|
|
|
|
#include "TeXFont_PFB.h"
|
|
#include "fontpool.h"
|
|
#include "kvs_debug.h"
|
|
|
|
#include <klocale.h>
|
|
|
|
#include <QImage>
|
|
|
|
//#define DEBUG_PFB 1
|
|
|
|
|
|
TeXFont_PFB::TeXFont_PFB(TeXFontDefinition *parent, fontEncoding *enc, double slant)
|
|
: TeXFont(parent), face(0)
|
|
{
|
|
#ifdef DEBUG_PFB
|
|
if (enc != 0)
|
|
kDebug(kvs::dvi) << "TeXFont_PFB::TeXFont_PFB( parent=" << parent << ", encoding=" << enc->encodingFullName << " )";
|
|
else
|
|
kDebug(kvs::dvi) << "TeXFont_PFB::TeXFont_PFB( parent=" << parent << ", encoding=0 )";
|
|
#endif
|
|
|
|
fatalErrorInFontLoading = false;
|
|
|
|
int error = FT_New_Face( parent->font_pool->FreeType_library, parent->filename.toLocal8Bit().constData(), 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.", parent->filename);
|
|
kError(kvs::dvi) << errorMessage << endl;
|
|
fatalErrorInFontLoading = true;
|
|
return;
|
|
} else
|
|
if ( error ) {
|
|
errorMessage = i18n("The font file %1 is broken, or it could not be opened or read.", parent->filename);
|
|
kError(kvs::dvi) << 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
|
|
kDebug(kvs::dvi) << "Trying to associate glyph indices to names from the encoding vector.";
|
|
#endif
|
|
for(int i=0; i<256; i++) {
|
|
charMap[i] = FT_Get_Name_Index( face, (FT_String *)(enc->glyphNameVector[i].toAscii().data()) );
|
|
#ifdef DEBUG_PFB
|
|
kDebug(kvs::dvi) << i << ": " << enc->glyphNameVector[i] << ", GlyphIndex=" << charMap[i];
|
|
#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
|
|
kDebug(kvs::dvi) << "No encoding given: using charmap platform=7, encoding=2 that is contained in the font.";
|
|
#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
|
|
kDebug(kvs::dvi) << "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
|
|
kDebug(kvs::dvi) << "No encoding given, no suitable charmaps found in the font: using identity charmap.";
|
|
#endif
|
|
for(int i=0; i<256; i++)
|
|
charMap[i] = i;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
TeXFont_PFB::~TeXFont_PFB()
|
|
{
|
|
FT_Done_Face( face );
|
|
}
|
|
|
|
|
|
glyph* TeXFont_PFB::getGlyph(quint16 ch, bool generateCharacterPixmap, const QColor& color)
|
|
{
|
|
#ifdef DEBUG_PFB
|
|
kDebug(kvs::dvi) << "TeXFont_PFB::getGlyph( ch=" << ch << ", '" << (char)(ch) << "', generateCharacterPixmap=" << generateCharacterPixmap << " )";
|
|
#endif
|
|
|
|
// Paranoia checks
|
|
if (ch >= TeXFontDefinition::max_num_of_chars_in_font) {
|
|
kError(kvs::dvi) << "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.", parent->filename);
|
|
if (errorMessage.isEmpty())
|
|
errorMessage = msg;
|
|
kError(kvs::dvi) << msg << endl;
|
|
g->shrunkenCharacter = QImage(1, 1, QImage::Format_RGB32);
|
|
g->shrunkenCharacter.fill(qRgb(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.", ch, parent->filename);
|
|
if (errorMessage.isEmpty())
|
|
errorMessage = msg;
|
|
kError(kvs::dvi) << msg << endl;
|
|
g->shrunkenCharacter = QImage(1, 1, QImage::Format_RGB32);
|
|
g->shrunkenCharacter.fill(qRgb(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.", ch, parent->filename);
|
|
if (errorMessage.isEmpty())
|
|
errorMessage = msg;
|
|
kError(kvs::dvi) << msg << endl;
|
|
g->shrunkenCharacter = QImage(1, 1, QImage::Format_RGB32);
|
|
g->shrunkenCharacter.fill(qRgb(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.", ch);
|
|
kError(kvs::dvi) << i18n("Glyph #%1 from font file %2 is empty.", ch, parent->filename) << endl;
|
|
g->shrunkenCharacter = QImage(15, 15 , QImage::Format_RGB32);
|
|
g->shrunkenCharacter.fill(qRgb(255, 0, 0));
|
|
g->x2 = 0;
|
|
g->y2 = 15;
|
|
} else {
|
|
QImage imgi(slot->bitmap.width, slot->bitmap.rows, QImage::Format_ARGB32);
|
|
|
|
// 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.
|
|
quint16 rInv = 0xFF - color.red();
|
|
quint16 gInv = 0xFF - color.green();
|
|
quint16 bInv = 0xFF - color.blue();
|
|
|
|
for(quint16 y=0; y<slot->bitmap.rows; y++) {
|
|
quint8 *srcScanLine = slot->bitmap.buffer + y*slot->bitmap.pitch;
|
|
unsigned int *destScanLine = (unsigned int *)imgi.scanLine(y);
|
|
for(quint16 col=0; col<slot->bitmap.width; col++) {
|
|
quint16 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 = imgi;
|
|
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.", ch, parent->filename);
|
|
if (errorMessage.isEmpty())
|
|
errorMessage = msg;
|
|
kError(kvs::dvi) << msg << endl;
|
|
g->dvi_advance_in_units_of_design_size_by_2e20 = 1;
|
|
}
|
|
g->dvi_advance_in_units_of_design_size_by_2e20 = (qint32)(((qint64)(1<<20) * (qint64)face->glyph->metrics.horiAdvance) / (qint64)face->units_per_EM);
|
|
}
|
|
|
|
return g;
|
|
}
|
|
|
|
#endif // HAVE_FREETYPE
|