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// Copyright 2016 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#include "core/fxge/android/cfpf_skiafont.h"
#include <algorithm>
#include "core/fxcrt/fx_system.h"
#include "core/fxge/android/cfpf_skiafontmgr.h"
#include "core/fxge/android/cfpf_skiapathfont.h"
#include "core/fxge/fx_freetype.h"
#define FPF_EM_ADJUST(em, a) (em == 0 ? (a) : (a)*1000 / em)
CFPF_SkiaFont::CFPF_SkiaFont(CFPF_SkiaFontMgr* pFontMgr,
const CFPF_SkiaPathFont* pFont,
uint32_t dwStyle,
uint8_t uCharset)
: m_pFontMgr(pFontMgr),
m_pFont(pFont),
m_Face(m_pFontMgr->GetFontFace(m_pFont->path(), m_pFont->face_index())),
m_dwStyle(dwStyle),
m_uCharset(uCharset) {}
CFPF_SkiaFont::~CFPF_SkiaFont() {
if (m_Face)
FXFT_Done_Face(m_Face);
}
void CFPF_SkiaFont::Release() {
if (--m_dwRefCount == 0)
delete this;
}
CFPF_SkiaFont* CFPF_SkiaFont::Retain() {
m_dwRefCount++;
return this;
}
ByteString CFPF_SkiaFont::GetFamilyName() {
if (!m_Face)
return ByteString();
return ByteString(FXFT_Get_Face_Family_Name(m_Face));
}
ByteString CFPF_SkiaFont::GetPsName() {
if (!m_Face)
return ByteString();
return FXFT_Get_Postscript_Name(m_Face);
}
int32_t CFPF_SkiaFont::GetGlyphIndex(wchar_t wUnicode) {
if (!m_Face)
return wUnicode;
if (FXFT_Select_Charmap(m_Face, FXFT_ENCODING_UNICODE))
return 0;
return FXFT_Get_Char_Index(m_Face, wUnicode);
}
int32_t CFPF_SkiaFont::GetGlyphWidth(int32_t iGlyphIndex) {
if (!m_Face)
return 0;
if (FXFT_Load_Glyph(
m_Face, iGlyphIndex,
FXFT_LOAD_NO_SCALE | FXFT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH)) {
return 0;
}
return FPF_EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
FXFT_Get_Glyph_HoriAdvance(m_Face));
}
int32_t CFPF_SkiaFont::GetAscent() const {
if (!m_Face)
return 0;
return FPF_EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
FXFT_Get_Face_Ascender(m_Face));
}
int32_t CFPF_SkiaFont::GetDescent() const {
if (!m_Face)
return 0;
return FPF_EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
FXFT_Get_Face_Descender(m_Face));
}
bool CFPF_SkiaFont::GetGlyphBBox(int32_t iGlyphIndex, FX_RECT& rtBBox) {
if (!m_Face)
return false;
if (FXFT_Is_Face_Tricky(m_Face)) {
if (FXFT_Set_Char_Size(m_Face, 0, 1000 * 64, 72, 72))
return false;
if (FXFT_Load_Glyph(m_Face, iGlyphIndex,
FXFT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH)) {
FXFT_Set_Pixel_Sizes(m_Face, 0, 64);
return false;
}
FXFT_Glyph glyph;
if (FXFT_Get_Glyph(m_Face->glyph, &glyph)) {
FXFT_Set_Pixel_Sizes(m_Face, 0, 64);
return false;
}
FXFT_BBox cbox;
FXFT_Glyph_Get_CBox(glyph, FXFT_GLYPH_BBOX_PIXELS, &cbox);
int32_t x_ppem = m_Face->size->metrics.x_ppem;
int32_t y_ppem = m_Face->size->metrics.y_ppem;
rtBBox.left = FPF_EM_ADJUST(x_ppem, cbox.xMin);
rtBBox.right = FPF_EM_ADJUST(x_ppem, cbox.xMax);
rtBBox.top = FPF_EM_ADJUST(y_ppem, cbox.yMax);
rtBBox.bottom = FPF_EM_ADJUST(y_ppem, cbox.yMin);
rtBBox.top = std::min(rtBBox.top, GetAscent());
rtBBox.bottom = std::max(rtBBox.bottom, GetDescent());
FXFT_Done_Glyph(glyph);
return FXFT_Set_Pixel_Sizes(m_Face, 0, 64) == 0;
}
if (FXFT_Load_Glyph(
m_Face, iGlyphIndex,
FXFT_LOAD_NO_SCALE | FXFT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH)) {
return false;
}
rtBBox.left = FPF_EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
FXFT_Get_Glyph_HoriBearingX(m_Face));
rtBBox.bottom = FPF_EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
FXFT_Get_Glyph_HoriBearingY(m_Face));
rtBBox.right = FPF_EM_ADJUST(
FXFT_Get_Face_UnitsPerEM(m_Face),
FXFT_Get_Glyph_HoriBearingX(m_Face) + FXFT_Get_Glyph_Width(m_Face));
rtBBox.top = FPF_EM_ADJUST(
FXFT_Get_Face_UnitsPerEM(m_Face),
FXFT_Get_Glyph_HoriBearingY(m_Face) - FXFT_Get_Glyph_Height(m_Face));
return true;
}
bool CFPF_SkiaFont::GetBBox(FX_RECT& rtBBox) {
if (!m_Face) {
return false;
}
rtBBox.left = FPF_EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
FXFT_Get_Face_xMin(m_Face));
rtBBox.top = FPF_EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
FXFT_Get_Face_yMin(m_Face));
rtBBox.right = FPF_EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
FXFT_Get_Face_xMax(m_Face));
rtBBox.bottom = FPF_EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
FXFT_Get_Face_yMax(m_Face));
return true;
}
int32_t CFPF_SkiaFont::GetHeight() const {
if (!m_Face)
return 0;
return FPF_EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
FXFT_Get_Face_Height(m_Face));
}
int32_t CFPF_SkiaFont::GetItalicAngle() const {
if (!m_Face)
return 0;
auto* info =
static_cast<TT_Postscript*>(FT_Get_Sfnt_Table(m_Face, ft_sfnt_post));
return info ? info->italicAngle : 0;
}
uint32_t CFPF_SkiaFont::GetFontData(uint32_t dwTable,
uint8_t* pBuffer,
uint32_t dwSize) {
if (!m_Face)
return 0;
FT_ULong ulSize = pdfium::base::checked_cast<FT_ULong>(dwSize);
if (FXFT_Load_Sfnt_Table(m_Face, dwTable, 0, pBuffer, &ulSize))
return 0;
return pdfium::base::checked_cast<uint32_t>(ulSize);
}
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