[Android] Add support for standalone PDFium gn build on Android.

core/fxge/android/fpf_skiafontmgr.cpp

 // Copyright 2014 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/fxcrt/include/fx_system.h"
 
 #if _FX_OS_ == _FX_ANDROID_
 
@@ skipping 12 matching lines @@
 #endif
 static unsigned long FPF_SkiaStream_Read(FXFT_Stream stream,
                                          unsigned long offset,
                                          unsigned char* buffer,
                                          unsigned long count) {
   IFX_FileRead* pFileRead = (IFX_FileRead*)stream->descriptor.pointer;
   if (!pFileRead) {
     return 0;
   }
   if (count > 0) {
-    if (pFileRead->ReadBlock(buffer, (FX_FILESIZE)offset, (size_t)count) !=
-        count) {
+    if (!pFileRead->ReadBlock(buffer, (FX_FILESIZE)offset, (size_t)count)) {
       return 0;
     }
   }
   return count;
 }
 static void FPF_SkiaStream_Close(FXFT_Stream stream) {}
 #ifdef __cplusplus
 };
 #endif
 struct FPF_SKIAFONTMAP {
@@ skipping 157 matching lines @@
   bsFont += uCharset;
   return FPF_GetHashCode_StringA(bsFont.c_str(), bsFont.GetLength(), TRUE);
 }
 static FX_BOOL FPF_SkiaIsCJK(uint8_t uCharset) {
   return (uCharset == FXFONT_GB2312_CHARSET) ||
          (uCharset == FXFONT_CHINESEBIG5_CHARSET) ||
          (uCharset == FXFONT_HANGEUL_CHARSET) ||
          (uCharset == FXFONT_SHIFTJIS_CHARSET);
 }
 static FX_BOOL FPF_SkiaMaybeSymbol(const CFX_ByteStringC& bsFacename) {
-  CFX_ByteString bsName = bsFacename;
+  CFX_ByteString bsName(bsFacename);
   bsName.MakeLower();
   return bsName.Find("symbol") > -1;
 }
 static FX_BOOL FPF_SkiaMaybeArabic(const CFX_ByteStringC& bsFacename) {
-  CFX_ByteString bsName = bsFacename;
+  CFX_ByteString bsName(bsFacename);
   bsName.MakeLower();
   return bsName.Find("arabic") > -1;
 }
 CFPF_SkiaFontMgr::CFPF_SkiaFontMgr() : m_bLoaded(FALSE), m_FTLibrary(nullptr) {}
 CFPF_SkiaFontMgr::~CFPF_SkiaFontMgr() {
   for (const auto& pair : m_FamilyFonts) {
     if (pair.second)
       pair.second->Release();
   }
   m_FamilyFonts.clear();
@@ skipping 136 matching lines @@
 FXFT_Face CFPF_SkiaFontMgr::GetFontFace(const CFX_ByteStringC& bsFile,
                                         int32_t iFaceIndex) {
   if (bsFile.IsEmpty()) {
     return nullptr;
   }
   if (iFaceIndex < 0) {
     return nullptr;
   }
   FXFT_Open_Args args;
   args.flags = FT_OPEN_PATHNAME;
-  args.pathname = static_cast<FT_String*>(bsFile.c_str());
+  args.pathname = const_cast<FT_String*>(bsFile.c_str());
   FXFT_Face face;
   if (FXFT_Open_Face(m_FTLibrary, &args, iFaceIndex, &face)) {
     return FALSE;
   }
   FXFT_Set_Pixel_Sizes(face, 0, 64);
   return face;
 }
 FXFT_Face CFPF_SkiaFontMgr::GetFontFace(const uint8_t* pBuffer,
                                         size_t szBuffer,
                                         int32_t iFaceIndex) {
   if (!pBuffer || szBuffer < 1) {
     return nullptr;
   }
   if (iFaceIndex < 0) {
     return nullptr;
   }
   FXFT_Open_Args args;
   args.flags = FT_OPEN_MEMORY;
   args.memory_base = pBuffer;
   args.memory_size = szBuffer;
   FXFT_Face face;
   if (FXFT_Open_Face(m_FTLibrary, &args, iFaceIndex, &face)) {
     return FALSE;
   }
   FXFT_Set_Pixel_Sizes(face, 0, 64);
   return face;
 }
-void CFPF_SkiaFontMgr::ScanPath(const CFX_ByteStringC& path) {
+void CFPF_SkiaFontMgr::ScanPath(const CFX_ByteString& path) {
   void* handle = FX_OpenFolder(path.c_str());
   if (!handle) {
     return;
   }
   CFX_ByteString filename;
   FX_BOOL bFolder = FALSE;
   while (FX_GetNextFile(handle, filename, bFolder)) {
     if (bFolder) {
       if (filename == "." || filename == "..") {
         continue;
       }
     } else {
       CFX_ByteString ext = filename.Right(4);
       ext.MakeLower();
       if (ext != ".ttf" && ext != ".ttc" && ext != ".otf") {
         continue;
       }
     }
-    CFX_ByteString fullpath = path;
+    CFX_ByteString fullpath(path);
     fullpath += "/";
     fullpath += filename;
     if (bFolder) {
       ScanPath(fullpath);
     } else {
       ScanFile(fullpath);
     }
   }
   FX_CloseFolder(handle);
 }
-void CFPF_SkiaFontMgr::ScanFile(const CFX_ByteStringC& file) {
-  FXFT_Face face = GetFontFace(file);
+void CFPF_SkiaFontMgr::ScanFile(const CFX_ByteString& file) {
+  FXFT_Face face = GetFontFace(file.AsStringC());
   if (face) {
     CFPF_SkiaPathFont* pFontDesc = new CFPF_SkiaPathFont;
     pFontDesc->SetPath(file.c_str());
     ReportFace(face, pFontDesc);
     m_FontFaces.push_back(pFontDesc);
     FXFT_Done_Face(face);
   }
 }
 static const uint32_t g_FPFSkiaFontCharsets[] = {
     FPF_SKIACHARSET_Ansi,
@@ skipping 70 matching lines @@
   }
   if (pOS2 && (pOS2->ulCodePageRange1 & (1 << 31))) {
     pFontDesc->m_dwStyle |= FXFONT_SYMBOLIC;
   }
   pFontDesc->m_dwCharsets = FPF_SkiaGetFaceCharset(pOS2);
   pFontDesc->m_iFaceIndex = face->face_index;
   pFontDesc->m_iGlyphNum = face->num_glyphs;
 }
 void CFPF_SkiaFontMgr::OutputSystemFonts() {}
 #endif