Split SkFontHost_win_dw.
Split SkFontHost_win_dw into FontMgr, Typeface, and ScalerContext.
This makes working on these files easier, and moves away from the legacy
FontHost naming.
R=reed@google.com
Author: bungeman@google.com
Review URL: https://codereview.chromium.org/314193002
diff --git a/src/utils/win/SkDWrite.h b/src/utils/win/SkDWrite.h
index 06e9c8b..679447d 100644
--- a/src/utils/win/SkDWrite.h
+++ b/src/utils/win/SkDWrite.h
@@ -5,6 +5,9 @@
* found in the LICENSE file.
*/
+#ifndef SkDWrite_DEFINED
+#define SkDWrite_DEFINED
+
#include "SkTemplates.h"
#include <dwrite.h>
@@ -36,3 +39,38 @@
typedef decltype(GetUserDefaultLocaleName)* SkGetUserDefaultLocaleNameProc;
HRESULT SkGetGetUserDefaultLocaleNameProc(SkGetUserDefaultLocaleNameProc* proc);
+
+////////////////////////////////////////////////////////////////////////////////
+// Table handling
+
+class AutoDWriteTable {
+public:
+ AutoDWriteTable(IDWriteFontFace* fontFace, UINT32 beTag) : fFontFace(fontFace), fExists(FALSE) {
+ // Any errors are ignored, user must check fExists anyway.
+ fontFace->TryGetFontTable(beTag,
+ reinterpret_cast<const void **>(&fData), &fSize, &fLock, &fExists);
+ }
+ ~AutoDWriteTable() {
+ if (fExists) {
+ fFontFace->ReleaseFontTable(fLock);
+ }
+ }
+
+ const uint8_t* fData;
+ UINT32 fSize;
+ BOOL fExists;
+private:
+ // Borrowed reference, the user must ensure the fontFace stays alive.
+ IDWriteFontFace* fFontFace;
+ void* fLock;
+};
+template<typename T> class AutoTDWriteTable : public AutoDWriteTable {
+public:
+ static const UINT32 tag = DWRITE_MAKE_OPENTYPE_TAG(T::TAG0, T::TAG1, T::TAG2, T::TAG3);
+ AutoTDWriteTable(IDWriteFontFace* fontFace) : AutoDWriteTable(fontFace, tag) { }
+
+ const T* get() const { return reinterpret_cast<const T*>(fData); }
+ const T* operator->() const { return reinterpret_cast<const T*>(fData); }
+};
+
+#endif