GrTextContext.h revision 4c18e9fbb685cccf23342757e786027a032197da 
1/*
2 * Copyright 2010 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 GrTextContext_DEFINED
9#define GrTextContext_DEFINED
10
11#include "GrPoint.h"
12#include "GrGlyph.h"
13#include "GrPaint.h"
14#include "SkDeviceProperties.h"
15
16#include "SkPostConfig.h"
17
18class GrContext;
19class GrDrawTarget;
20class GrFontScaler;
21
22/*
23 * This class wraps the state for a single text render
24 */
25class GrTextContext {
26public:
27    virtual ~GrTextContext() {}
28    virtual void drawText(const GrPaint&, const SkPaint&, const char text[], size_t byteLength,
29                          SkScalar x, SkScalar y) = 0;
30    virtual void drawPosText(const GrPaint&, const SkPaint&,
31                             const char text[], size_t byteLength,
32                             const SkScalar pos[], SkScalar constY,
33                             int scalarsPerPosition) = 0;
34
35    virtual bool canDraw(const SkPaint& paint) = 0;
36
37protected:
38    GrTextContext(GrContext*, const SkDeviceProperties&);
39
40    static GrFontScaler* GetGrFontScaler(SkGlyphCache* cache);
41    static void MeasureText(SkGlyphCache* cache, SkDrawCacheProc glyphCacheProc,
42                            const char text[], size_t byteLength, SkVector* stopVector);
43
44    void init(const GrPaint&, const SkPaint&);
45    void finish() { fDrawTarget = NULL; }
46
47    GrContext*         fContext;
48    SkDeviceProperties fDeviceProperties;
49
50    GrDrawTarget*      fDrawTarget;
51    SkIRect            fClipRect;
52    GrPaint            fPaint;
53    SkPaint            fSkPaint;
54};
55
56#endif
57