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/*
* Copyright 2010 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrTextContext.h"
#include "GrContext.h"
#include "GrDrawTarget.h"
#include "GrFontScaler.h"
#include "SkAutoKern.h"
#include "SkGlyphCache.h"
GrTextContext::GrTextContext(GrContext* context, const SkDeviceProperties& properties) :
fFallbackTextContext(NULL),
fContext(context), fDeviceProperties(properties), fDrawTarget(NULL) {
}
GrTextContext::~GrTextContext() {
SkDELETE(fFallbackTextContext);
}
void GrTextContext::init(GrRenderTarget* rt, const GrClip& clip, const GrPaint& grPaint,
const SkPaint& skPaint) {
fClip = clip;
fRenderTarget.reset(SkRef(rt));
fClip.getConservativeBounds(fRenderTarget->width(), fRenderTarget->height(), &fClipRect);
fDrawTarget = fContext->getTextTarget();
fPaint = grPaint;
fSkPaint = skPaint;
}
bool GrTextContext::drawText(GrRenderTarget* rt, const GrClip& clip, const GrPaint& paint,
const SkPaint& skPaint, const SkMatrix& viewMatrix,
const char text[], size_t byteLength,
SkScalar x, SkScalar y) {
GrTextContext* textContext = this;
do {
if (textContext->canDraw(skPaint, viewMatrix)) {
textContext->onDrawText(rt, clip, paint, skPaint, viewMatrix, text, byteLength, x, y);
return true;
}
textContext = textContext->fFallbackTextContext;
} while (textContext);
return false;
}
bool GrTextContext::drawPosText(GrRenderTarget* rt, const GrClip& clip, const GrPaint& paint,
const SkPaint& skPaint, const SkMatrix& viewMatrix,
const char text[], size_t byteLength,
const SkScalar pos[], int scalarsPerPosition,
const SkPoint& offset) {
GrTextContext* textContext = this;
do {
if (textContext->canDraw(skPaint, viewMatrix)) {
textContext->onDrawPosText(rt, clip, paint, skPaint, viewMatrix, text, byteLength, pos,
scalarsPerPosition, offset);
return true;
}
textContext = textContext->fFallbackTextContext;
} while (textContext);
return false;
}
//*** change to output positions?
int GrTextContext::MeasureText(SkGlyphCache* cache, SkDrawCacheProc glyphCacheProc,
const char text[], size_t byteLength, SkVector* stopVector) {
SkFixed x = 0, y = 0;
const char* stop = text + byteLength;
SkAutoKern autokern;
int numGlyphs = 0;
while (text < stop) {
// don't need x, y here, since all subpixel variants will have the
// same advance
const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0);
x += autokern.adjust(glyph) + glyph.fAdvanceX;
y += glyph.fAdvanceY;
++numGlyphs;
}
stopVector->set(SkFixedToScalar(x), SkFixedToScalar(y));
SkASSERT(text == stop);
return numGlyphs;
}
static void GlyphCacheAuxProc(void* data) {
GrFontScaler* scaler = (GrFontScaler*)data;
SkSafeUnref(scaler);
}
GrFontScaler* GrTextContext::GetGrFontScaler(SkGlyphCache* cache) {
void* auxData;
GrFontScaler* scaler = NULL;
if (cache->getAuxProcData(GlyphCacheAuxProc, &auxData)) {
scaler = (GrFontScaler*)auxData;
}
if (NULL == scaler) {
scaler = SkNEW_ARGS(GrFontScaler, (cache));
cache->setAuxProc(GlyphCacheAuxProc, scaler);
}
return scaler;
}
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