1 /*
2 *******************************************************************************
3 *
4 * Copyright (C) 1999-2007, International Business Machines
5 * Corporation and others. All Rights Reserved.
6 *
7 *******************************************************************************
8 * file name: GnomeFontInstance.cpp
9 *
10 * created on: 08/30/2001
11 * created by: Eric R. Mader
12 */
13
14 #include <gnome.h>
15 #include <ft2build.h>
16 #include FT_FREETYPE_H
17 #include FT_GLYPH_H
18 #include FT_RENDER_H
19 #include FT_TRUETYPE_TABLES_H
20 #include <cairo.h>
21 #include <cairo-ft.h>
22
23 #include "layout/LETypes.h"
24 #include "layout/LESwaps.h"
25
26 #include "GnomeFontInstance.h"
27 #include "sfnt.h"
28 #include "cmaps.h"
29
GnomeSurface(GtkWidget * theWidget)30 GnomeSurface::GnomeSurface(GtkWidget *theWidget)
31 : fWidget(theWidget)
32 {
33 fCairo = gdk_cairo_create(fWidget->window);
34 }
35
~GnomeSurface()36 GnomeSurface::~GnomeSurface()
37 {
38 cairo_destroy(fCairo);
39 }
40
drawGlyphs(const LEFontInstance * font,const LEGlyphID * glyphs,le_int32 count,const float * positions,le_int32 x,le_int32 y,le_int32,le_int32)41 void GnomeSurface::drawGlyphs(const LEFontInstance *font, const LEGlyphID *glyphs, le_int32 count,
42 const float *positions, le_int32 x, le_int32 y, le_int32 /*width*/, le_int32 /*height*/)
43 {
44 GnomeFontInstance *gFont = (GnomeFontInstance *) font;
45
46 gFont->rasterizeGlyphs(fCairo, glyphs, count, positions, x, y);
47 }
48
GnomeFontInstance(FT_Library engine,const char * fontPathName,le_int16 pointSize,LEErrorCode & status)49 GnomeFontInstance::GnomeFontInstance(FT_Library engine, const char *fontPathName, le_int16 pointSize, LEErrorCode &status)
50 : FontTableCache(), fPointSize(pointSize), fUnitsPerEM(0), fAscent(0), fDescent(0), fLeading(0),
51 fDeviceScaleX(1), fDeviceScaleY(1), fMapper(NULL)
52 {
53 FT_Error error;
54
55 fFace = NULL;
56 fCairoFace = NULL;
57
58 error = FT_New_Face(engine, fontPathName, 0, &fFace);
59
60 if (error != 0) {
61 printf("OOPS! Got error code %d\n", error);
62 status = LE_FONT_FILE_NOT_FOUND_ERROR;
63 return;
64 }
65
66 // FIXME: what about the display resolution?
67 fDeviceScaleX = ((float) 96) / 72;
68 fDeviceScaleY = ((float) 96) / 72;
69
70 error = FT_Set_Char_Size(fFace, 0, pointSize << 6, 92, 92);
71
72 fCairoFace = cairo_ft_font_face_create_for_ft_face(fFace, 0);
73
74 fUnitsPerEM = fFace->units_per_EM;
75
76 fAscent = (le_int32) (yUnitsToPoints(fFace->ascender) * fDeviceScaleY);
77 fDescent = (le_int32) -(yUnitsToPoints(fFace->descender) * fDeviceScaleY);
78 fLeading = (le_int32) (yUnitsToPoints(fFace->height) * fDeviceScaleY) - fAscent - fDescent;
79
80 // printf("Face = %s, unitsPerEM = %d, ascent = %d, descent = %d\n", fontPathName, fUnitsPerEM, fAscent, fDescent);
81
82 if (error != 0) {
83 status = LE_MEMORY_ALLOCATION_ERROR;
84 return;
85 }
86
87 status = initMapper();
88 }
89
~GnomeFontInstance()90 GnomeFontInstance::~GnomeFontInstance()
91 {
92 cairo_font_face_destroy(fCairoFace);
93
94 if (fFace != NULL) {
95 FT_Done_Face(fFace);
96 }
97 }
98
initMapper()99 LEErrorCode GnomeFontInstance::initMapper()
100 {
101 LETag cmapTag = LE_CMAP_TABLE_TAG;
102 const CMAPTable *cmap = (const CMAPTable *) readFontTable(cmapTag);
103
104 if (cmap == NULL) {
105 return LE_MISSING_FONT_TABLE_ERROR;
106 }
107
108 fMapper = CMAPMapper::createUnicodeMapper(cmap);
109
110 if (fMapper == NULL) {
111 return LE_MISSING_FONT_TABLE_ERROR;
112 }
113
114 return LE_NO_ERROR;
115 }
116
getFontTable(LETag tableTag) const117 const void *GnomeFontInstance::getFontTable(LETag tableTag) const
118 {
119 return FontTableCache::find(tableTag);
120 }
121
readFontTable(LETag tableTag) const122 const void *GnomeFontInstance::readFontTable(LETag tableTag) const
123 {
124 FT_ULong len = 0;
125 FT_Byte *result = NULL;
126
127 FT_Load_Sfnt_Table(fFace, tableTag, 0, NULL, &len);
128
129 if (len > 0) {
130 result = LE_NEW_ARRAY(FT_Byte, len);
131 FT_Load_Sfnt_Table(fFace, tableTag, 0, result, &len);
132 }
133
134 return result;
135 }
136
getGlyphAdvance(LEGlyphID glyph,LEPoint & advance) const137 void GnomeFontInstance::getGlyphAdvance(LEGlyphID glyph, LEPoint &advance) const
138 {
139 advance.fX = 0;
140 advance.fY = 0;
141
142 if (glyph >= 0xFFFE) {
143 return;
144 }
145
146 FT_Error error;
147
148 error = FT_Load_Glyph(fFace, glyph, FT_LOAD_DEFAULT);
149
150 if (error != 0) {
151 return;
152 }
153
154 advance.fX = fFace->glyph->metrics.horiAdvance >> 6;
155 return;
156 }
157
getGlyphPoint(LEGlyphID glyph,le_int32 pointNumber,LEPoint & point) const158 le_bool GnomeFontInstance::getGlyphPoint(LEGlyphID glyph, le_int32 pointNumber, LEPoint &point) const
159 {
160 FT_Error error;
161
162 error = FT_Load_Glyph(fFace, glyph, FT_LOAD_DEFAULT);
163
164 if (error != 0) {
165 return FALSE;
166 }
167
168 if (pointNumber >= fFace->glyph->outline.n_points) {
169 return FALSE;
170 }
171
172 point.fX = fFace->glyph->outline.points[pointNumber].x >> 6;
173 point.fY = fFace->glyph->outline.points[pointNumber].y >> 6;
174
175 return TRUE;
176 }
177
rasterizeGlyphs(cairo_t * cairo,const LEGlyphID * glyphs,le_int32 glyphCount,const float * positions,le_int32 x,le_int32 y) const178 void GnomeFontInstance::rasterizeGlyphs(cairo_t *cairo, const LEGlyphID *glyphs, le_int32 glyphCount, const float *positions,
179 le_int32 x, le_int32 y) const
180 {
181 cairo_glyph_t *glyph_t = LE_NEW_ARRAY(cairo_glyph_t, glyphCount);
182 le_int32 in, out;
183
184 for (in = 0, out = 0; in < glyphCount; in += 1) {
185 TTGlyphID glyph = LE_GET_GLYPH(glyphs[in]);
186
187 if (glyph < 0xFFFE) {
188 glyph_t[out].index = glyph;
189 glyph_t[out].x = x + positions[in*2];
190 glyph_t[out].y = y + positions[in*2 + 1];
191
192 out += 1;
193 }
194 }
195
196 cairo_set_font_face(cairo, fCairoFace);
197 cairo_set_font_size(cairo, getXPixelsPerEm() * getScaleFactorX());
198 cairo_show_glyphs(cairo, glyph_t, out);
199
200 LE_DELETE_ARRAY(glyph_t);
201 }
202