1 // Copyright 2014 PDFium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
6
7 #include "fx_fpf.h"
8
9 #include <algorithm>
10
11 #if _FX_OS_ == _FX_ANDROID_
12 #include "fpf_skiafont.h"
13 #include "fpf_skiafontmgr.h"
14 #define FPF_EM_ADJUST(em, a) (em == 0 ? (a) : (a)*1000 / em)
CFPF_SkiaFont()15 CFPF_SkiaFont::CFPF_SkiaFont()
16 : m_pFontMgr(NULL),
17 m_pFontDes(NULL),
18 m_Face(NULL),
19 m_dwStyle(0),
20 m_uCharset(0),
21 m_dwRefCount(0) {}
~CFPF_SkiaFont()22 CFPF_SkiaFont::~CFPF_SkiaFont() {
23 if (m_Face) {
24 FXFT_Done_Face(m_Face);
25 }
26 }
Release()27 void CFPF_SkiaFont::Release() {
28 if (--m_dwRefCount == 0) {
29 delete this;
30 }
31 }
Retain()32 IFPF_Font* CFPF_SkiaFont::Retain() {
33 m_dwRefCount++;
34 return (IFPF_Font*)this;
35 }
GetHandle()36 FPF_HFONT CFPF_SkiaFont::GetHandle() {
37 return NULL;
38 }
GetFamilyName()39 CFX_ByteString CFPF_SkiaFont::GetFamilyName() {
40 if (!m_Face) {
41 return CFX_ByteString();
42 }
43 return CFX_ByteString(FXFT_Get_Face_Family_Name(m_Face));
44 }
GetPsName()45 CFX_WideString CFPF_SkiaFont::GetPsName() {
46 if (!m_Face) {
47 return CFX_WideString();
48 }
49 return CFX_WideString::FromLocal(FXFT_Get_Postscript_Name(m_Face));
50 }
GetGlyphIndex(FX_WCHAR wUnicode)51 int32_t CFPF_SkiaFont::GetGlyphIndex(FX_WCHAR wUnicode) {
52 if (!m_Face) {
53 return wUnicode;
54 }
55 if (FXFT_Select_Charmap(m_Face, FXFT_ENCODING_UNICODE)) {
56 return 0;
57 }
58 return FXFT_Get_Char_Index(m_Face, wUnicode);
59 }
GetGlyphWidth(int32_t iGlyphIndex)60 int32_t CFPF_SkiaFont::GetGlyphWidth(int32_t iGlyphIndex) {
61 if (!m_Face) {
62 return 0;
63 }
64 if (FXFT_Load_Glyph(
65 m_Face, iGlyphIndex,
66 FXFT_LOAD_NO_SCALE | FXFT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH)) {
67 return 0;
68 }
69 return FPF_EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
70 FXFT_Get_Glyph_HoriAdvance(m_Face));
71 }
GetAscent() const72 int32_t CFPF_SkiaFont::GetAscent() const {
73 if (!m_Face) {
74 return 0;
75 }
76 return FPF_EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
77 FXFT_Get_Face_Ascender(m_Face));
78 }
GetDescent() const79 int32_t CFPF_SkiaFont::GetDescent() const {
80 if (!m_Face) {
81 return 0;
82 }
83 return FPF_EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
84 FXFT_Get_Face_Descender(m_Face));
85 }
GetGlyphBBox(int32_t iGlyphIndex,FX_RECT & rtBBox)86 FX_BOOL CFPF_SkiaFont::GetGlyphBBox(int32_t iGlyphIndex, FX_RECT& rtBBox) {
87 if (!m_Face) {
88 return FALSE;
89 }
90 if (FXFT_Is_Face_Tricky(m_Face)) {
91 if (FXFT_Set_Char_Size(m_Face, 0, 1000 * 64, 72, 72)) {
92 return FALSE;
93 }
94 if (FXFT_Load_Glyph(m_Face, iGlyphIndex,
95 FXFT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH)) {
96 FXFT_Set_Pixel_Sizes(m_Face, 0, 64);
97 return FALSE;
98 }
99 FXFT_Glyph glyph;
100 if (FXFT_Get_Glyph(m_Face->glyph, &glyph)) {
101 FXFT_Set_Pixel_Sizes(m_Face, 0, 64);
102 return FALSE;
103 }
104 FXFT_BBox cbox;
105 FXFT_Glyph_Get_CBox(glyph, FXFT_GLYPH_BBOX_PIXELS, &cbox);
106 int32_t x_ppem = m_Face->size->metrics.x_ppem;
107 int32_t y_ppem = m_Face->size->metrics.y_ppem;
108 rtBBox.left = FPF_EM_ADJUST(x_ppem, cbox.xMin);
109 rtBBox.right = FPF_EM_ADJUST(x_ppem, cbox.xMax);
110 rtBBox.top = FPF_EM_ADJUST(y_ppem, cbox.yMax);
111 rtBBox.bottom = FPF_EM_ADJUST(y_ppem, cbox.yMin);
112 rtBBox.top = std::min(rtBBox.top, GetAscent());
113 rtBBox.bottom = std::max(rtBBox.bottom, GetDescent());
114 FXFT_Done_Glyph(glyph);
115 return FXFT_Set_Pixel_Sizes(m_Face, 0, 64) == 0;
116 }
117 if (FXFT_Load_Glyph(
118 m_Face, iGlyphIndex,
119 FXFT_LOAD_NO_SCALE | FXFT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH)) {
120 return FALSE;
121 }
122 rtBBox.left = FPF_EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
123 FXFT_Get_Glyph_HoriBearingX(m_Face));
124 rtBBox.bottom = FPF_EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
125 FXFT_Get_Glyph_HoriBearingY(m_Face));
126 rtBBox.right = FPF_EM_ADJUST(
127 FXFT_Get_Face_UnitsPerEM(m_Face),
128 FXFT_Get_Glyph_HoriBearingX(m_Face) + FXFT_Get_Glyph_Width(m_Face));
129 rtBBox.top = FPF_EM_ADJUST(
130 FXFT_Get_Face_UnitsPerEM(m_Face),
131 FXFT_Get_Glyph_HoriBearingY(m_Face) - FXFT_Get_Glyph_Height(m_Face));
132 return TRUE;
133 }
GetBBox(FX_RECT & rtBBox)134 FX_BOOL CFPF_SkiaFont::GetBBox(FX_RECT& rtBBox) {
135 if (!m_Face) {
136 return FALSE;
137 }
138 rtBBox.left = FPF_EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
139 FXFT_Get_Face_xMin(m_Face));
140 rtBBox.top = FPF_EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
141 FXFT_Get_Face_yMin(m_Face));
142 rtBBox.right = FPF_EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
143 FXFT_Get_Face_xMax(m_Face));
144 rtBBox.bottom = FPF_EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
145 FXFT_Get_Face_yMax(m_Face));
146 return TRUE;
147 }
GetHeight() const148 int32_t CFPF_SkiaFont::GetHeight() const {
149 if (!m_Face) {
150 return 0;
151 }
152 return FPF_EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
153 FXFT_Get_Face_Height(m_Face));
154 }
GetItalicAngle() const155 int32_t CFPF_SkiaFont::GetItalicAngle() const {
156 if (!m_Face) {
157 return 0;
158 }
159 TT_Postscript* ttInfo =
160 (TT_Postscript*)FT_Get_Sfnt_Table(m_Face, ft_sfnt_post);
161 if (ttInfo) {
162 return ttInfo->italicAngle;
163 }
164 return 0;
165 }
GetFontData(FX_DWORD dwTable,uint8_t * pBuffer,FX_DWORD dwSize)166 FX_DWORD CFPF_SkiaFont::GetFontData(FX_DWORD dwTable,
167 uint8_t* pBuffer,
168 FX_DWORD dwSize) {
169 if (!m_Face) {
170 return 0;
171 }
172 FT_ULong ulSize = pdfium::base::checked_cast<FT_ULong>(dwSize);
173 if (FXFT_Load_Sfnt_Table(m_Face, dwTable, 0, pBuffer, &ulSize)) {
174 return 0;
175 }
176 return pdfium::base::checked_cast<FX_DWORD>(ulSize);
177 }
InitFont(CFPF_SkiaFontMgr * pFontMgr,CFPF_SkiaFontDescriptor * pFontDes,const CFX_ByteStringC & bsFamily,FX_DWORD dwStyle,uint8_t uCharset)178 FX_BOOL CFPF_SkiaFont::InitFont(CFPF_SkiaFontMgr* pFontMgr,
179 CFPF_SkiaFontDescriptor* pFontDes,
180 const CFX_ByteStringC& bsFamily,
181 FX_DWORD dwStyle,
182 uint8_t uCharset) {
183 if (!pFontMgr || !pFontDes) {
184 return FALSE;
185 }
186 switch (pFontDes->GetType()) {
187 case FPF_SKIAFONTTYPE_Path: {
188 CFPF_SkiaPathFont* pFont = (CFPF_SkiaPathFont*)pFontDes;
189 m_Face = pFontMgr->GetFontFace(pFont->m_pPath, pFont->m_iFaceIndex);
190 } break;
191 case FPF_SKIAFONTTYPE_File: {
192 CFPF_SkiaFileFont* pFont = (CFPF_SkiaFileFont*)pFontDes;
193 m_Face = pFontMgr->GetFontFace(pFont->m_pFile, pFont->m_iFaceIndex);
194 } break;
195 case FPF_SKIAFONTTYPE_Buffer: {
196 CFPF_SkiaBufferFont* pFont = (CFPF_SkiaBufferFont*)pFontDes;
197 m_Face = pFontMgr->GetFontFace((const uint8_t*)pFont->m_pBuffer,
198 pFont->m_szBuffer, pFont->m_iFaceIndex);
199 } break;
200 default:
201 return FALSE;
202 }
203 if (!m_Face) {
204 return FALSE;
205 }
206 m_dwStyle = dwStyle;
207 m_uCharset = uCharset;
208 m_pFontMgr = pFontMgr;
209 m_pFontDes = pFontDes;
210 m_dwRefCount = 1;
211 return TRUE;
212 }
213 #endif
214