michael@0: /*
michael@0:  * Copyright 2010 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: #include "GrTextContext.h"
michael@0: #include "GrContext.h"
michael@0: 
michael@0: #include "SkAutoKern.h"
michael@0: #include "SkGlyphCache.h"
michael@0: #include "SkGr.h"
michael@0: 
michael@0: GrTextContext::GrTextContext(GrContext* context, const SkDeviceProperties& properties) :
michael@0:                             fContext(context), fDeviceProperties(properties), fDrawTarget(NULL) {
michael@0: }
michael@0: 
michael@0: void GrTextContext::init(const GrPaint& grPaint, const SkPaint& skPaint) {
michael@0:     const GrClipData* clipData = fContext->getClip();
michael@0: 
michael@0:     SkRect devConservativeBound;
michael@0:     clipData->fClipStack->getConservativeBounds(
michael@0:                                      -clipData->fOrigin.fX,
michael@0:                                      -clipData->fOrigin.fY,
michael@0:                                      fContext->getRenderTarget()->width(),
michael@0:                                      fContext->getRenderTarget()->height(),
michael@0:                                      &devConservativeBound);
michael@0: 
michael@0:     devConservativeBound.roundOut(&fClipRect);
michael@0: 
michael@0:     fDrawTarget = fContext->getTextTarget();
michael@0: 
michael@0:     fPaint = grPaint;
michael@0:     fSkPaint = skPaint;
michael@0: }
michael@0: 
michael@0: //*** change to output positions?
michael@0: void GrTextContext::MeasureText(SkGlyphCache* cache, SkDrawCacheProc glyphCacheProc,
michael@0:                                 const char text[], size_t byteLength, SkVector* stopVector) {
michael@0:     SkFixed     x = 0, y = 0;
michael@0:     const char* stop = text + byteLength;
michael@0: 
michael@0:     SkAutoKern  autokern;
michael@0: 
michael@0:     while (text < stop) {
michael@0:         // don't need x, y here, since all subpixel variants will have the
michael@0:         // same advance
michael@0:         const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0);
michael@0: 
michael@0:         x += autokern.adjust(glyph) + glyph.fAdvanceX;
michael@0:         y += glyph.fAdvanceY;
michael@0:     }
michael@0:     stopVector->set(SkFixedToScalar(x), SkFixedToScalar(y));
michael@0: 
michael@0:     SkASSERT(text == stop);
michael@0: }
michael@0: 
michael@0: static void GlyphCacheAuxProc(void* data) {
michael@0:     GrFontScaler* scaler = (GrFontScaler*)data;
michael@0:     SkSafeUnref(scaler);
michael@0: }
michael@0: 
michael@0: GrFontScaler* GrTextContext::GetGrFontScaler(SkGlyphCache* cache) {
michael@0:     void* auxData;
michael@0:     GrFontScaler* scaler = NULL;
michael@0: 
michael@0:     if (cache->getAuxProcData(GlyphCacheAuxProc, &auxData)) {
michael@0:         scaler = (GrFontScaler*)auxData;
michael@0:     }
michael@0:     if (NULL == scaler) {
michael@0:         scaler = SkNEW_ARGS(SkGrFontScaler, (cache));
michael@0:         cache->setAuxProc(GlyphCacheAuxProc, scaler);
michael@0:     }
michael@0: 
michael@0:     return scaler;
michael@0: }