1 /*
2 *******************************************************************************
3 *
4 * Copyright (C) 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