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 15 GrTextContext::GrTextContext(GrContext* context, const SkDeviceProperties& properties) : 16 fContext(context), fDeviceProperties(properties), fDrawTarget(NULL) { 17 } 18 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? 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 59 static void GlyphCacheAuxProc(void* data) { 60 GrFontScaler* scaler = (GrFontScaler*)data; 61 SkSafeUnref(scaler); 62 } 63 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
