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
17class SkString;
18
19////////////////////////////////////////////////////////////////////////////////
20// Factory
21
22IDWriteFactory* sk_get_dwrite_factory();
23
24////////////////////////////////////////////////////////////////////////////////
25// String conversion
26
27/** Prefer to use this type to prevent template proliferation. */
28typedef SkAutoSTMalloc<16, WCHAR> SkSMallocWCHAR;
29
30/** Converts a utf8 string to a WCHAR string. */
31HRESULT sk_cstring_to_wchar(const char* skname, SkSMallocWCHAR* name);
32
33/** Converts a WCHAR string to a utf8 string.
34 *  @param nameLen the number of WCHARs in the name.
35 */
36HRESULT sk_wchar_to_skstring(WCHAR* name, int nameLen, SkString* skname);
37
38////////////////////////////////////////////////////////////////////////////////
39// Locale
40
41void sk_get_locale_string(IDWriteLocalizedStrings* names, const WCHAR* preferedLocale,
42                       SkString* skname);
43
44typedef int (WINAPI *SkGetUserDefaultLocaleNameProc)(LPWSTR, int);
45HRESULT SkGetGetUserDefaultLocaleNameProc(SkGetUserDefaultLocaleNameProc* proc);
46
47////////////////////////////////////////////////////////////////////////////////
48// Table handling
49
50class AutoDWriteTable {
51public:
52    AutoDWriteTable(IDWriteFontFace* fontFace, UINT32 beTag) : fExists(FALSE), fFontFace(fontFace) {
53        // Any errors are ignored, user must check fExists anyway.
54        fontFace->TryGetFontTable(beTag,
55            reinterpret_cast<const void **>(&fData), &fSize, &fLock, &fExists);
56    }
57    ~AutoDWriteTable() {
58        if (fExists) {
59            fFontFace->ReleaseFontTable(fLock);
60        }
61    }
62
63    const uint8_t* fData;
64    UINT32 fSize;
65    BOOL fExists;
66private:
67    // Borrowed reference, the user must ensure the fontFace stays alive.
68    IDWriteFontFace* fFontFace;
69    void* fLock;
70};
71template<typename T> class AutoTDWriteTable : public AutoDWriteTable {
72public:
73    static const UINT32 tag = DWRITE_MAKE_OPENTYPE_TAG(T::TAG0, T::TAG1, T::TAG2, T::TAG3);
74    AutoTDWriteTable(IDWriteFontFace* fontFace) : AutoDWriteTable(fontFace, tag) { }
75
76    const T* get() const { return reinterpret_cast<const T*>(fData); }
77    const T* operator->() const { return reinterpret_cast<const T*>(fData); }
78};
79
80////////////////////////////////////////////////////////////////////////////////
81// Style conversion
82
83struct DWriteStyle {
84    explicit DWriteStyle(const SkFontStyle& pattern) {
85        fWeight = (DWRITE_FONT_WEIGHT)pattern.weight();
86        fWidth = (DWRITE_FONT_STRETCH)pattern.width();
87        switch (pattern.slant()) {
88            case SkFontStyle::kUpright_Slant: fSlant = DWRITE_FONT_STYLE_NORMAL ; break;
89            case SkFontStyle::kItalic_Slant:  fSlant = DWRITE_FONT_STYLE_ITALIC ; break;
90            case SkFontStyle::kOblique_Slant: fSlant = DWRITE_FONT_STYLE_OBLIQUE; break;
91            default: SkASSERT(false); break;
92        }
93    }
94    DWRITE_FONT_WEIGHT fWeight;
95    DWRITE_FONT_STRETCH fWidth;
96    DWRITE_FONT_STYLE fSlant;
97};
98
99#endif
100