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      1 /*
      2  * Copyright 2014 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #ifndef SkDWrite_DEFINED
      9 #define SkDWrite_DEFINED
     10 
     11 #include "SkFontStyle.h"
     12 #include "SkTemplates.h"
     13 
     14 #include <dwrite.h>
     15 #include <winsdkver.h>
     16 
     17 class SkString;
     18 
     19 ////////////////////////////////////////////////////////////////////////////////
     20 // Factory
     21 
     22 #ifndef SK_HAS_DWRITE_1_H
     23 #define SK_HAS_DWRITE_1_H (WINVER_MAXVER >= 0x0602)
     24 #endif
     25 
     26 #ifndef SK_HAS_DWRITE_2_H
     27 #define SK_HAS_DWRITE_2_H (WINVER_MAXVER >= 0x0603)
     28 #endif
     29 
     30 IDWriteFactory* sk_get_dwrite_factory();
     31 
     32 ////////////////////////////////////////////////////////////////////////////////
     33 // String conversion
     34 
     35 /** Prefer to use this type to prevent template proliferation. */
     36 typedef SkAutoSTMalloc<16, WCHAR> SkSMallocWCHAR;
     37 
     38 /** Converts a utf8 string to a WCHAR string. */
     39 HRESULT sk_cstring_to_wchar(const char* skname, SkSMallocWCHAR* name);
     40 
     41 /** Converts a WCHAR string to a utf8 string.
     42  *  @param nameLen the number of WCHARs in the name.
     43  */
     44 HRESULT sk_wchar_to_skstring(WCHAR* name, int nameLen, SkString* skname);
     45 
     46 ////////////////////////////////////////////////////////////////////////////////
     47 // Locale
     48 
     49 void sk_get_locale_string(IDWriteLocalizedStrings* names, const WCHAR* preferedLocale,
     50                        SkString* skname);
     51 
     52 typedef int (WINAPI *SkGetUserDefaultLocaleNameProc)(LPWSTR, int);
     53 HRESULT SkGetGetUserDefaultLocaleNameProc(SkGetUserDefaultLocaleNameProc* proc);
     54 
     55 ////////////////////////////////////////////////////////////////////////////////
     56 // Table handling
     57 
     58 class AutoDWriteTable {
     59 public:
     60     AutoDWriteTable(IDWriteFontFace* fontFace, UINT32 beTag) : fExists(FALSE), fFontFace(fontFace) {
     61         // Any errors are ignored, user must check fExists anyway.
     62         fontFace->TryGetFontTable(beTag,
     63             reinterpret_cast<const void **>(&fData), &fSize, &fLock, &fExists);
     64     }
     65     ~AutoDWriteTable() {
     66         if (fExists) {
     67             fFontFace->ReleaseFontTable(fLock);
     68         }
     69     }
     70 
     71     const uint8_t* fData;
     72     UINT32 fSize;
     73     BOOL fExists;
     74 private:
     75     // Borrowed reference, the user must ensure the fontFace stays alive.
     76     IDWriteFontFace* fFontFace;
     77     void* fLock;
     78 };
     79 template<typename T> class AutoTDWriteTable : public AutoDWriteTable {
     80 public:
     81     static const UINT32 tag = DWRITE_MAKE_OPENTYPE_TAG(T::TAG0, T::TAG1, T::TAG2, T::TAG3);
     82     AutoTDWriteTable(IDWriteFontFace* fontFace) : AutoDWriteTable(fontFace, tag) { }
     83 
     84     const T* get() const { return reinterpret_cast<const T*>(fData); }
     85     const T* operator->() const { return reinterpret_cast<const T*>(fData); }
     86 };
     87 
     88 ////////////////////////////////////////////////////////////////////////////////
     89 // Style conversion
     90 
     91 struct DWriteStyle {
     92     explicit DWriteStyle(const SkFontStyle& pattern) {
     93         switch (pattern.slant()) {
     94         case SkFontStyle::kUpright_Slant:
     95             fSlant = DWRITE_FONT_STYLE_NORMAL;
     96             break;
     97         case SkFontStyle::kItalic_Slant:
     98             fSlant = DWRITE_FONT_STYLE_ITALIC;
     99             break;
    100         default:
    101             SkASSERT(false);
    102         }
    103 
    104         fWeight = (DWRITE_FONT_WEIGHT)pattern.weight();
    105         fWidth = (DWRITE_FONT_STRETCH)pattern.width();
    106     }
    107     DWRITE_FONT_STYLE fSlant;
    108     DWRITE_FONT_WEIGHT fWeight;
    109     DWRITE_FONT_STRETCH fWidth;
    110 };
    111 
    112 #endif
    113