github.com/pdfcpu/pdfcpu@v0.11.1/internal/corefont/metrics/metrics.go (about)

     1  /*
     2  Copyright 2018 The pdfcpu Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8  	http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  // Package metrics provides font metrics for the PDF standard fonts.
    18  package metrics
    19  
    20  // The PostScript names of the 14 Type 1 fonts, aka the PDF core font set, are as follows:
    21  //
    22  // Times-Roman,
    23  // Helvetica,
    24  // Courier,
    25  // Symbol,
    26  // Times-Bold,
    27  // Helvetica-Bold,
    28  // Courier-Bold,
    29  // ZapfDingbats,
    30  // Times-Italic,
    31  // Helvetica- Oblique,
    32  // Courier-Oblique,
    33  // Times-BoldItalic,
    34  // Helvetica-BoldOblique,
    35  // Courier-BoldOblique
    36  
    37  // CoreFontCharWidth returns the character width for fontName and c in glyph space units.
    38  func CoreFontCharWidth(fontName string, c int) int {
    39  	var m map[int]string
    40  	switch fontName {
    41  	case "Symbol":
    42  		m = SymbolGlyphMap
    43  	case "ZapfDingbats":
    44  		m = ZapfDingbatsGlyphMap
    45  	default:
    46  		m = WinAnsiGlyphMap
    47  	}
    48  	glyphName := m[c]
    49  	fm := CoreFontMetrics[fontName]
    50  	w, ok := fm.W[glyphName]
    51  	if !ok {
    52  		w = 1000 //m.W["bullet"]
    53  	}
    54  	return w
    55  }