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#if _FX_OS_ == _FX_ANDROID_
9#include "fpf_skiafont.h"
10#include "fpf_skiafontmgr.h"
11#define FPF_EM_ADJUST(em, a) (em == 0 ? (a) : (a) * 1000 / em)
12CFPF_SkiaFont::CFPF_SkiaFont()
13    : m_pFontMgr(NULL)
14    , m_pFontDes(NULL)
15    , m_Face(NULL)
16    , m_dwStyle(0)
17    , m_uCharset(0)
18    , m_dwRefCount(0)
19{
20}
21CFPF_SkiaFont::~CFPF_SkiaFont()
22{
23    if (m_Face) {
24        FXFT_Done_Face(m_Face);
25    }
26}
27void CFPF_SkiaFont::Release()
28{
29    if (--m_dwRefCount == 0) {
30        delete this;
31    }
32}
33IFPF_Font* CFPF_SkiaFont::Retain()
34{
35    m_dwRefCount++;
36    return (IFPF_Font*)this;
37}
38FPF_HFONT CFPF_SkiaFont::GetHandle()
39{
40    return NULL;
41}
42CFX_ByteString CFPF_SkiaFont::GetFamilyName()
43{
44    if (!m_Face) {
45        return CFX_ByteString();
46    }
47    return CFX_ByteString(FXFT_Get_Face_Family_Name(m_Face));
48}
49CFX_WideString CFPF_SkiaFont::GetPsName()
50{
51    if (!m_Face) {
52        return CFX_WideString();
53    }
54    return CFX_WideString::FromLocal(FXFT_Get_Postscript_Name(m_Face));
55}
56FX_INT32 CFPF_SkiaFont::GetGlyphIndex(FX_WCHAR wUnicode)
57{
58    if (!m_Face) {
59        return wUnicode;
60    }
61    if (FXFT_Select_Charmap(m_Face, FXFT_ENCODING_UNICODE)) {
62        return 0;
63    }
64    return FXFT_Get_Char_Index(m_Face, wUnicode);
65}
66FX_INT32 CFPF_SkiaFont::GetGlyphWidth(FX_INT32 iGlyphIndex)
67{
68    if (!m_Face) {
69        return 0;
70    }
71    if (FXFT_Load_Glyph(m_Face, iGlyphIndex, FXFT_LOAD_NO_SCALE | FXFT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH)) {
72        return 0;
73    }
74    return FPF_EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face), FXFT_Get_Glyph_HoriAdvance(m_Face));
75}
76FX_INT32 CFPF_SkiaFont::GetAscent() const
77{
78    if (!m_Face) {
79        return 0;
80    }
81    return FPF_EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face), FXFT_Get_Face_Ascender(m_Face));
82}
83FX_INT32 CFPF_SkiaFont::GetDescent() const
84{
85    if (!m_Face) {
86        return 0;
87    }
88    return FPF_EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face), FXFT_Get_Face_Descender(m_Face));
89}
90FX_BOOL CFPF_SkiaFont::GetGlyphBBox(FX_INT32 iGlyphIndex, FX_RECT &rtBBox)
91{
92    if (!m_Face) {
93        return FALSE;
94    }
95    if (FXFT_Is_Face_Tricky(m_Face)) {
96        if (FXFT_Set_Char_Size(m_Face, 0, 1000 * 64, 72, 72)) {
97            return FALSE;
98        }
99        if (FXFT_Load_Glyph(m_Face, iGlyphIndex, FXFT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH)) {
100            FXFT_Set_Pixel_Sizes(m_Face, 0, 64);
101            return FALSE;
102        }
103        FXFT_Glyph glyph;
104        if (FXFT_Get_Glyph(m_Face->glyph, &glyph)) {
105            FXFT_Set_Pixel_Sizes(m_Face, 0, 64);
106            return FALSE;
107        }
108        FXFT_BBox cbox;
109        FXFT_Glyph_Get_CBox(glyph, FXFT_GLYPH_BBOX_PIXELS, &cbox);
110        FX_INT32 x_ppem = m_Face->size->metrics.x_ppem;
111        FX_INT32 y_ppem = m_Face->size->metrics.y_ppem;
112        rtBBox.left = FPF_EM_ADJUST(x_ppem, cbox.xMin);
113        rtBBox.right = FPF_EM_ADJUST(x_ppem, cbox.xMax);
114        rtBBox.top = FPF_EM_ADJUST(y_ppem, cbox.yMax);
115        rtBBox.bottom = FPF_EM_ADJUST(y_ppem, cbox.yMin);
116        rtBBox.top = FX_MIN(rtBBox.top, GetAscent());
117        rtBBox.bottom = FX_MAX(rtBBox.bottom, GetDescent());
118        FXFT_Done_Glyph(glyph);
119        return FXFT_Set_Pixel_Sizes(m_Face, 0, 64) == 0;
120    }
121    if (FXFT_Load_Glyph(m_Face, iGlyphIndex, FXFT_LOAD_NO_SCALE | FXFT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH)) {
122        return FALSE;
123    }
124    rtBBox.left = FPF_EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face), FXFT_Get_Glyph_HoriBearingX(m_Face));
125    rtBBox.bottom = FPF_EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face), FXFT_Get_Glyph_HoriBearingY(m_Face));
126    rtBBox.right = FPF_EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face), FXFT_Get_Glyph_HoriBearingX(m_Face) + FXFT_Get_Glyph_Width(m_Face));
127    rtBBox.top = FPF_EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face), FXFT_Get_Glyph_HoriBearingY(m_Face) - FXFT_Get_Glyph_Height(m_Face));
128    return TRUE;
129}
130FX_BOOL CFPF_SkiaFont::GetBBox(FX_RECT &rtBBox)
131{
132    if (!m_Face) {
133        return FALSE;
134    }
135    rtBBox.left = FPF_EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face), FXFT_Get_Face_xMin(m_Face));
136    rtBBox.top = FPF_EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face), FXFT_Get_Face_yMin(m_Face));
137    rtBBox.right = FPF_EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face), FXFT_Get_Face_xMax(m_Face));
138    rtBBox.bottom = FPF_EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face), FXFT_Get_Face_yMax(m_Face));
139    return TRUE;
140}
141FX_INT32 CFPF_SkiaFont::GetHeight() const
142{
143    if (!m_Face) {
144        return 0;
145    }
146    return	FPF_EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face), FXFT_Get_Face_Height(m_Face));
147}
148FX_INT32 CFPF_SkiaFont::GetItalicAngle() const
149{
150    if (!m_Face) {
151        return 0;
152    }
153    TT_Postscript *ttInfo = (TT_Postscript*)FT_Get_Sfnt_Table(m_Face, ft_sfnt_post);
154    if (ttInfo) {
155        return ttInfo->italicAngle;
156    }
157    return 0;
158}
159FX_DWORD CFPF_SkiaFont::GetFontData(FX_DWORD dwTable, FX_LPBYTE pBuffer, FX_DWORD dwSize)
160{
161    if (!m_Face) {
162        return FALSE;
163    }
164    if (FXFT_Load_Sfnt_Table(m_Face, dwTable, 0, pBuffer, (unsigned long*)&dwSize)) {
165        return 0;
166    }
167    return dwSize;
168}
169FX_BOOL CFPF_SkiaFont::InitFont(CFPF_SkiaFontMgr *pFontMgr, CFPF_SkiaFontDescriptor *pFontDes, FX_BSTR bsFamily, FX_DWORD dwStyle, FX_BYTE uCharset)
170{
171    if (!pFontMgr || !pFontDes) {
172        return FALSE;
173    }
174    switch (pFontDes->GetType()) {
175        case FPF_SKIAFONTTYPE_Path: {
176                CFPF_SkiaPathFont *pFont = (CFPF_SkiaPathFont*)pFontDes;
177                m_Face = pFontMgr->GetFontFace(pFont->m_pPath, pFont->m_iFaceIndex);
178            }
179            break;
180        case FPF_SKIAFONTTYPE_File: {
181                CFPF_SkiaFileFont *pFont = (CFPF_SkiaFileFont*)pFontDes;
182                m_Face = pFontMgr->GetFontFace(pFont->m_pFile, pFont->m_iFaceIndex);
183            }
184            break;
185        case FPF_SKIAFONTTYPE_Buffer: {
186                CFPF_SkiaBufferFont *pFont = (CFPF_SkiaBufferFont*)pFontDes;
187                m_Face = pFontMgr->GetFontFace((FX_LPCBYTE)pFont->m_pBuffer, pFont->m_szBuffer, pFont->m_iFaceIndex);
188            }
189            break;
190        default:
191            return FALSE;
192    }
193    if (!m_Face) {
194        return FALSE;
195    }
196    m_dwStyle = dwStyle;
197    m_uCharset = uCharset;
198    m_pFontMgr = pFontMgr;
199    m_pFontDes = pFontDes;
200    m_dwRefCount = 1;
201    return TRUE;
202}
203#endif
204