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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkGScalerContext.h"
#include "SkGlyph.h"
#include "SkPath.h"
#include "SkCanvas.h"
class SkGScalerContext : public SkScalerContext {
public:
SkGScalerContext(SkGTypeface*, const SkDescriptor*);
virtual ~SkGScalerContext();
protected:
virtual unsigned generateGlyphCount() SK_OVERRIDE;
virtual uint16_t generateCharToGlyph(SkUnichar) SK_OVERRIDE;
virtual void generateAdvance(SkGlyph*) SK_OVERRIDE;
virtual void generateMetrics(SkGlyph*) SK_OVERRIDE;
virtual void generateImage(const SkGlyph&) SK_OVERRIDE;
virtual void generatePath(const SkGlyph&, SkPath*) SK_OVERRIDE;
virtual void generateFontMetrics(SkPaint::FontMetrics*) SK_OVERRIDE;
private:
SkGTypeface* fFace;
SkScalerContext* fProxy;
SkMatrix fMatrix;
};
#define STD_SIZE 1
#include "SkDescriptor.h"
SkGScalerContext::SkGScalerContext(SkGTypeface* face, const SkDescriptor* desc)
: SkScalerContext(face, desc)
, fFace(face)
{
size_t descSize = SkDescriptor::ComputeOverhead(1) + sizeof(SkScalerContext::Rec);
SkAutoDescriptor ad(descSize);
SkDescriptor* newDesc = ad.getDesc();
newDesc->init();
void* entry = newDesc->addEntry(kRec_SkDescriptorTag,
sizeof(SkScalerContext::Rec), &fRec);
{
SkScalerContext::Rec* rec = (SkScalerContext::Rec*)entry;
rec->fTextSize = STD_SIZE;
rec->fPreScaleX = SK_Scalar1;
rec->fPreSkewX = 0;
rec->fPost2x2[0][0] = rec->fPost2x2[1][1] = SK_Scalar1;
rec->fPost2x2[1][0] = rec->fPost2x2[0][1] = 0;
}
SkASSERT(descSize == newDesc->getLength());
newDesc->computeChecksum();
fProxy = face->proxy()->createScalerContext(newDesc);
fRec.getSingleMatrix(&fMatrix);
fMatrix.preScale(SK_Scalar1 / STD_SIZE, SK_Scalar1 / STD_SIZE);
}
SkGScalerContext::~SkGScalerContext() {
SkDELETE(fProxy);
}
unsigned SkGScalerContext::generateGlyphCount() {
return fProxy->getGlyphCount();
}
uint16_t SkGScalerContext::generateCharToGlyph(SkUnichar uni) {
return fProxy->charToGlyphID(uni);
}
void SkGScalerContext::generateAdvance(SkGlyph* glyph) {
fProxy->getAdvance(glyph);
SkVector advance;
fMatrix.mapXY(SkFixedToScalar(glyph->fAdvanceX),
SkFixedToScalar(glyph->fAdvanceY), &advance);
glyph->fAdvanceX = SkScalarToFixed(advance.fX);
glyph->fAdvanceY = SkScalarToFixed(advance.fY);
}
void SkGScalerContext::generateMetrics(SkGlyph* glyph) {
fProxy->getMetrics(glyph);
SkVector advance;
fMatrix.mapXY(SkFixedToScalar(glyph->fAdvanceX),
SkFixedToScalar(glyph->fAdvanceY), &advance);
glyph->fAdvanceX = SkScalarToFixed(advance.fX);
glyph->fAdvanceY = SkScalarToFixed(advance.fY);
SkPath path;
fProxy->getPath(*glyph, &path);
path.transform(fMatrix);
SkRect storage;
const SkPaint& paint = fFace->paint();
const SkRect& newBounds = paint.doComputeFastBounds(path.getBounds(),
&storage,
SkPaint::kFill_Style);
SkIRect ibounds;
newBounds.roundOut(&ibounds);
glyph->fLeft = ibounds.fLeft;
glyph->fTop = ibounds.fTop;
glyph->fWidth = ibounds.width();
glyph->fHeight = ibounds.height();
glyph->fMaskFormat = SkMask::kARGB32_Format;
}
void SkGScalerContext::generateImage(const SkGlyph& glyph) {
if (SkMask::kARGB32_Format == glyph.fMaskFormat) {
SkPath path;
fProxy->getPath(glyph, &path);
SkBitmap bm;
bm.installPixels(SkImageInfo::MakeN32Premul(glyph.fWidth, glyph.fHeight),
glyph.fImage, glyph.rowBytes());
bm.eraseColor(0);
SkCanvas canvas(bm);
canvas.translate(-SkIntToScalar(glyph.fLeft),
-SkIntToScalar(glyph.fTop));
canvas.concat(fMatrix);
canvas.drawPath(path, fFace->paint());
} else {
fProxy->getImage(glyph);
}
}
void SkGScalerContext::generatePath(const SkGlyph& glyph, SkPath* path) {
fProxy->getPath(glyph, path);
path->transform(fMatrix);
}
void SkGScalerContext::generateFontMetrics(SkPaint::FontMetrics* metrics) {
fProxy->getFontMetrics(metrics);
if (metrics) {
SkScalar scale = fMatrix.getScaleY();
metrics->fTop = SkScalarMul(metrics->fTop, scale);
metrics->fAscent = SkScalarMul(metrics->fAscent, scale);
metrics->fDescent = SkScalarMul(metrics->fDescent, scale);
metrics->fBottom = SkScalarMul(metrics->fBottom, scale);
metrics->fLeading = SkScalarMul(metrics->fLeading, scale);
metrics->fAvgCharWidth = SkScalarMul(metrics->fAvgCharWidth, scale);
metrics->fXMin = SkScalarMul(metrics->fXMin, scale);
metrics->fXMax = SkScalarMul(metrics->fXMax, scale);
metrics->fXHeight = SkScalarMul(metrics->fXHeight, scale);
}
}
///////////////////////////////////////////////////////////////////////////////
#include "SkTypefaceCache.h"
SkGTypeface::SkGTypeface(SkTypeface* proxy, const SkPaint& paint)
: SkTypeface(proxy->fontStyle(), SkTypefaceCache::NewFontID(), false)
, fProxy(SkRef(proxy))
, fPaint(paint) {}
SkGTypeface::~SkGTypeface() {
fProxy->unref();
}
SkScalerContext* SkGTypeface::onCreateScalerContext(
const SkDescriptor* desc) const {
return SkNEW_ARGS(SkGScalerContext, (const_cast<SkGTypeface*>(this), desc));
}
void SkGTypeface::onFilterRec(SkScalerContextRec* rec) const {
fProxy->filterRec(rec);
rec->setHinting(SkPaint::kNo_Hinting);
rec->fMaskFormat = SkMask::kARGB32_Format;
}
SkAdvancedTypefaceMetrics* SkGTypeface::onGetAdvancedTypefaceMetrics(
SkAdvancedTypefaceMetrics::PerGlyphInfo info,
const uint32_t* glyphIDs,
uint32_t glyphIDsCount) const {
return fProxy->getAdvancedTypefaceMetrics(info, glyphIDs, glyphIDsCount);
}
SkStream* SkGTypeface::onOpenStream(int* ttcIndex) const {
return fProxy->openStream(ttcIndex);
}
void SkGTypeface::onGetFontDescriptor(SkFontDescriptor* desc,
bool* isLocal) const {
fProxy->getFontDescriptor(desc, isLocal);
}
int SkGTypeface::onCharsToGlyphs(const void* chars, Encoding encoding,
uint16_t glyphs[], int glyphCount) const {
return fProxy->charsToGlyphs(chars, encoding, glyphs, glyphCount);
}
int SkGTypeface::onCountGlyphs() const {
return fProxy->countGlyphs();
}
int SkGTypeface::onGetUPEM() const {
return fProxy->getUnitsPerEm();
}
void SkGTypeface::onGetFamilyName(SkString* familyName) const {
fProxy->getFamilyName(familyName);
}
SkTypeface::LocalizedStrings* SkGTypeface::onCreateFamilyNameIterator() const {
return fProxy->createFamilyNameIterator();
}
int SkGTypeface::onGetTableTags(SkFontTableTag tags[]) const {
return fProxy->getTableTags(tags);
}
size_t SkGTypeface::onGetTableData(SkFontTableTag tag, size_t offset,
size_t length, void* data) const {
return fProxy->getTableData(tag, offset, length, data);
}
///////////////////////////////////////////////////////////////////////////////
#if 0
// under construction -- defining a font purely in terms of skia primitives
// ala an SVG-font.
class SkGFont : public SkRefCnt {
public:
virtual ~SkGFont();
int unicharToGlyph(SkUnichar) const;
int countGlyphs() const { return fCount; }
float getAdvance(int index) const {
SkASSERT((unsigned)index < (unsigned)fCount);
return fGlyphs[index].fAdvance;
}
const SkPath& getPath(int index) const {
SkASSERT((unsigned)index < (unsigned)fCount);
return fGlyphs[index].fPath;
}
private:
struct Glyph {
SkUnichar fUni;
float fAdvance;
SkPath fPath;
};
int fCount;
Glyph* fGlyphs;
friend class SkGFontBuilder;
SkGFont(int count, Glyph* array);
};
class SkGFontBuilder {
public:
};
#endif
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