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1 /*
2  *******************************************************************************
3  *
4  *   © 2016 and later: Unicode, Inc. and others.
5  *   License & terms of use: http://www.unicode.org/copyright.html#License
6  *
7  *******************************************************************************
8  *******************************************************************************
9  *
10  *   Copyright (C) 1999-2007, International Business Machines
11  *   Corporation and others.  All Rights Reserved.
12  *
13  *******************************************************************************
14  *   file name:  GnomeFontInstance.cpp
15  *
16  *   created on: 08/30/2001
17  *   created by: Eric R. Mader
18  */
19 
20 #include <gnome.h>
21 #include <ft2build.h>
22 #include FT_FREETYPE_H
23 #include FT_GLYPH_H
24 #include FT_RENDER_H
25 #include FT_TRUETYPE_TABLES_H
26 #include <cairo.h>
27 #include <cairo-ft.h>
28 
29 #include "layout/LETypes.h"
30 #include "layout/LESwaps.h"
31 
32 #include "GnomeFontInstance.h"
33 #include "sfnt.h"
34 #include "cmaps.h"
35 
GnomeSurface(GtkWidget * theWidget)36 GnomeSurface::GnomeSurface(GtkWidget *theWidget)
37     : fWidget(theWidget)
38 {
39     fCairo = gdk_cairo_create(fWidget->window);
40 }
41 
~GnomeSurface()42 GnomeSurface::~GnomeSurface()
43 {
44     cairo_destroy(fCairo);
45 }
46 
drawGlyphs(const LEFontInstance * font,const LEGlyphID * glyphs,le_int32 count,const float * positions,le_int32 x,le_int32 y,le_int32,le_int32)47 void GnomeSurface::drawGlyphs(const LEFontInstance *font, const LEGlyphID *glyphs, le_int32 count,
48                               const float *positions, le_int32 x, le_int32 y, le_int32 /*width*/, le_int32 /*height*/)
49 {
50     GnomeFontInstance *gFont = (GnomeFontInstance *) font;
51 
52     gFont->rasterizeGlyphs(fCairo, glyphs, count, positions, x, y);
53 }
54 
GnomeFontInstance(FT_Library engine,const char * fontPathName,le_int16 pointSize,LEErrorCode & status)55 GnomeFontInstance::GnomeFontInstance(FT_Library engine, const char *fontPathName, le_int16 pointSize, LEErrorCode &status)
56     : FontTableCache(), fPointSize(pointSize), fUnitsPerEM(0), fAscent(0), fDescent(0), fLeading(0),
57       fDeviceScaleX(1), fDeviceScaleY(1), fMapper(NULL)
58 {
59     FT_Error error;
60 
61     fFace      = NULL;
62     fCairoFace = NULL;
63 
64     error = FT_New_Face(engine, fontPathName, 0, &fFace);
65 
66     if (error != 0) {
67         printf("OOPS! Got error code %d\n", error);
68         status = LE_FONT_FILE_NOT_FOUND_ERROR;
69         return;
70     }
71 
72     // FIXME: what about the display resolution?
73     fDeviceScaleX = ((float) 96) / 72;
74     fDeviceScaleY = ((float) 96) / 72;
75 
76     error = FT_Set_Char_Size(fFace, 0, pointSize << 6, 92, 92);
77 
78     fCairoFace = cairo_ft_font_face_create_for_ft_face(fFace, 0);
79 
80     fUnitsPerEM = fFace->units_per_EM;
81 
82     fAscent  = (le_int32) (yUnitsToPoints(fFace->ascender) * fDeviceScaleY);
83     fDescent = (le_int32) -(yUnitsToPoints(fFace->descender) * fDeviceScaleY);
84     fLeading = (le_int32) (yUnitsToPoints(fFace->height) * fDeviceScaleY) - fAscent - fDescent;
85 
86     // printf("Face = %s, unitsPerEM = %d, ascent = %d, descent = %d\n", fontPathName, fUnitsPerEM, fAscent, fDescent);
87 
88     if (error != 0) {
89         status = LE_MEMORY_ALLOCATION_ERROR;
90         return;
91     }
92 
93     status = initMapper();
94 }
95 
~GnomeFontInstance()96 GnomeFontInstance::~GnomeFontInstance()
97 {
98     cairo_font_face_destroy(fCairoFace);
99 
100     if (fFace != NULL) {
101         FT_Done_Face(fFace);
102     }
103 }
104 
initMapper()105 LEErrorCode GnomeFontInstance::initMapper()
106 {
107     LETag cmapTag = LE_CMAP_TABLE_TAG;
108     const CMAPTable *cmap = (const CMAPTable *) readFontTable(cmapTag);
109 
110     if (cmap == NULL) {
111         return LE_MISSING_FONT_TABLE_ERROR;
112     }
113 
114     fMapper = CMAPMapper::createUnicodeMapper(cmap);
115 
116     if (fMapper == NULL) {
117         return LE_MISSING_FONT_TABLE_ERROR;
118     }
119 
120     return LE_NO_ERROR;
121 }
122 
getFontTable(LETag tableTag) const123 const void *GnomeFontInstance::getFontTable(LETag tableTag) const
124 {
125     return FontTableCache::find(tableTag);
126 }
127 
readFontTable(LETag tableTag) const128 const void *GnomeFontInstance::readFontTable(LETag tableTag) const
129 {
130     FT_ULong len = 0;
131     FT_Byte *result = NULL;
132 
133     FT_Load_Sfnt_Table(fFace, tableTag, 0, NULL, &len);
134 
135     if (len > 0) {
136         result = LE_NEW_ARRAY(FT_Byte, len);
137         FT_Load_Sfnt_Table(fFace, tableTag, 0, result, &len);
138     }
139 
140     return result;
141 }
142 
getGlyphAdvance(LEGlyphID glyph,LEPoint & advance) const143 void GnomeFontInstance::getGlyphAdvance(LEGlyphID glyph, LEPoint &advance) const
144 {
145     advance.fX = 0;
146     advance.fY = 0;
147 
148     if (glyph >= 0xFFFE) {
149         return;
150     }
151 
152     FT_Error error;
153 
154     error = FT_Load_Glyph(fFace, glyph, FT_LOAD_DEFAULT);
155 
156     if (error != 0) {
157         return;
158     }
159 
160     advance.fX = fFace->glyph->metrics.horiAdvance >> 6;
161     return;
162 }
163 
getGlyphPoint(LEGlyphID glyph,le_int32 pointNumber,LEPoint & point) const164 le_bool GnomeFontInstance::getGlyphPoint(LEGlyphID glyph, le_int32 pointNumber, LEPoint &point) const
165 {
166     FT_Error error;
167 
168     error = FT_Load_Glyph(fFace, glyph, FT_LOAD_DEFAULT);
169 
170     if (error != 0) {
171         return FALSE;
172     }
173 
174     if (pointNumber >= fFace->glyph->outline.n_points) {
175         return FALSE;
176     }
177 
178     point.fX = fFace->glyph->outline.points[pointNumber].x >> 6;
179     point.fY = fFace->glyph->outline.points[pointNumber].y >> 6;
180 
181     return TRUE;
182 }
183 
rasterizeGlyphs(cairo_t * cairo,const LEGlyphID * glyphs,le_int32 glyphCount,const float * positions,le_int32 x,le_int32 y) const184 void GnomeFontInstance::rasterizeGlyphs(cairo_t *cairo, const LEGlyphID *glyphs, le_int32 glyphCount, const float *positions,
185                                         le_int32 x, le_int32 y) const
186 {
187     cairo_glyph_t *glyph_t = LE_NEW_ARRAY(cairo_glyph_t, glyphCount);
188     le_int32 in, out;
189 
190     for (in = 0, out = 0; in < glyphCount; in += 1) {
191         TTGlyphID glyph = LE_GET_GLYPH(glyphs[in]);
192 
193         if (glyph < 0xFFFE) {
194             glyph_t[out].index = glyph;
195             glyph_t[out].x     = x + positions[in*2];
196             glyph_t[out].y     = y + positions[in*2 + 1];
197 
198             out += 1;
199         }
200     }
201 
202     cairo_set_font_face(cairo, fCairoFace);
203     cairo_set_font_size(cairo, getXPixelsPerEm() * getScaleFactorX());
204     cairo_show_glyphs(cairo, glyph_t, out);
205 
206     LE_DELETE_ARRAY(glyph_t);
207 }
208