| |
| /* |
| * Copyright 2010 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| |
| |
| #ifndef GrTextContext_DEFINED |
| #define GrTextContext_DEFINED |
| |
| #include "GrGlyph.h" |
| #include "GrMatrix.h" |
| #include "GrRefCnt.h" |
| |
| class GrContext; |
| class GrFontScaler; |
| class GrPaint; |
| |
| class SkGpuDevice; |
| class SkPaint; |
| |
| class GrTextContext: public GrRefCnt { |
| protected: |
| GrContext* fContext; |
| |
| public: |
| /** |
| * To use a text context it must be wrapped in an AutoFinish. AutoFinish's |
| * destructor ensures all drawing is flushed to the GrContext. |
| */ |
| class AutoFinish { |
| public: |
| AutoFinish(GrTextContext* textContext, GrContext* context, |
| const GrPaint&, const GrMatrix* extMatrix); |
| ~AutoFinish(); |
| GrTextContext* getTextContext() const; |
| |
| private: |
| GrTextContext* fTextContext; |
| }; |
| |
| virtual void drawPackedGlyph(GrGlyph::PackedID, GrFixed left, GrFixed top, |
| GrFontScaler*) = 0; |
| |
| virtual ~GrTextContext() {} |
| |
| protected: |
| GrTextContext() { |
| fContext = NULL; |
| } |
| |
| bool isValid() const { |
| return (NULL != fContext); |
| } |
| |
| /** |
| * Initialize the object. |
| * |
| * Before call to this method, the instance is considered to be in |
| * invalid state. I.e. call to any method other than isValid will result in |
| * undefined behaviour. |
| * |
| * @see finish |
| */ |
| virtual void init(GrContext* context, const GrPaint&, |
| const GrMatrix* extMatrix) { |
| fContext = context; |
| } |
| |
| /** |
| * Reset the object to invalid state. |
| * |
| * After call to this method, the instance is considered to be in |
| * invalid state. |
| * |
| * It might be brought back to a valid state by calling init. |
| * |
| * @see init |
| */ |
| virtual void finish() { |
| fContext = NULL; |
| } |
| |
| private: |
| typedef GrRefCnt INHERITED; |
| }; |
| |
| inline GrTextContext::AutoFinish::AutoFinish(GrTextContext* textContext, |
| GrContext* context, |
| const GrPaint& grPaint, |
| const GrMatrix* extMatrix) { |
| GrAssert(NULL != textContext); |
| fTextContext = textContext; |
| fTextContext->ref(); |
| fTextContext->init(context, grPaint, extMatrix); |
| } |
| |
| inline GrTextContext::AutoFinish::~AutoFinish() { |
| fTextContext->finish(); |
| fTextContext->unref(); |
| } |
| |
| inline GrTextContext* GrTextContext::AutoFinish::getTextContext() const { |
| return fTextContext; |
| } |
| |
| #endif |