• Home
  • History
  • Annotate
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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 #include "GrTextContext.h"
9 #include "GrContext.h"
10 
11 #include "SkAutoKern.h"
12 #include "SkGlyphCache.h"
13 #include "GrFontScaler.h"
14 
GrTextContext(GrContext * context,const SkDeviceProperties & properties)15 GrTextContext::GrTextContext(GrContext* context, const SkDeviceProperties& properties) :
16                             fContext(context), fDeviceProperties(properties), fDrawTarget(NULL) {
17 }
18 
init(const GrPaint & grPaint,const SkPaint & skPaint)19 void GrTextContext::init(const GrPaint& grPaint, const SkPaint& skPaint) {
20     const GrClipData* clipData = fContext->getClip();
21 
22     SkRect devConservativeBound;
23     clipData->fClipStack->getConservativeBounds(
24                                      -clipData->fOrigin.fX,
25                                      -clipData->fOrigin.fY,
26                                      fContext->getRenderTarget()->width(),
27                                      fContext->getRenderTarget()->height(),
28                                      &devConservativeBound);
29 
30     devConservativeBound.roundOut(&fClipRect);
31 
32     fDrawTarget = fContext->getTextTarget();
33 
34     fPaint = grPaint;
35     fSkPaint = skPaint;
36 }
37 
38 //*** change to output positions?
MeasureText(SkGlyphCache * cache,SkDrawCacheProc glyphCacheProc,const char text[],size_t byteLength,SkVector * stopVector)39 void GrTextContext::MeasureText(SkGlyphCache* cache, SkDrawCacheProc glyphCacheProc,
40                                 const char text[], size_t byteLength, SkVector* stopVector) {
41     SkFixed     x = 0, y = 0;
42     const char* stop = text + byteLength;
43 
44     SkAutoKern  autokern;
45 
46     while (text < stop) {
47         // don't need x, y here, since all subpixel variants will have the
48         // same advance
49         const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0);
50 
51         x += autokern.adjust(glyph) + glyph.fAdvanceX;
52         y += glyph.fAdvanceY;
53     }
54     stopVector->set(SkFixedToScalar(x), SkFixedToScalar(y));
55 
56     SkASSERT(text == stop);
57 }
58 
GlyphCacheAuxProc(void * data)59 static void GlyphCacheAuxProc(void* data) {
60     GrFontScaler* scaler = (GrFontScaler*)data;
61     SkSafeUnref(scaler);
62 }
63 
GetGrFontScaler(SkGlyphCache * cache)64 GrFontScaler* GrTextContext::GetGrFontScaler(SkGlyphCache* cache) {
65     void* auxData;
66     GrFontScaler* scaler = NULL;
67 
68     if (cache->getAuxProcData(GlyphCacheAuxProc, &auxData)) {
69         scaler = (GrFontScaler*)auxData;
70     }
71     if (NULL == scaler) {
72         scaler = SkNEW_ARGS(GrFontScaler, (cache));
73         cache->setAuxProc(GlyphCacheAuxProc, scaler);
74     }
75 
76     return scaler;
77 }
78