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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkCanvas.h"
#include "SkGlyph.h"
#include "SkMakeUnique.h"
#include "SkPath.h"
#include "SkRandomScalerContext.h"
#include "SkRasterizer.h"
class SkDescriptor;
class SkRandomScalerContext : public SkScalerContext {
public:
SkRandomScalerContext(sk_sp<SkRandomTypeface>, const SkScalerContextEffects&,
const SkDescriptor*, bool fFakeIt);
protected:
unsigned generateGlyphCount() override;
uint16_t generateCharToGlyph(SkUnichar) override;
void generateAdvance(SkGlyph*) override;
void generateMetrics(SkGlyph*) override;
void generateImage(const SkGlyph&) override;
void generatePath(SkGlyphID, SkPath*) override;
void generateFontMetrics(SkPaint::FontMetrics*) override;
private:
SkRandomTypeface* getRandomTypeface() const {
return static_cast<SkRandomTypeface*>(this->getTypeface());
}
std::unique_ptr<SkScalerContext> fProxy;
bool fFakeIt;
};
SkRandomScalerContext::SkRandomScalerContext(sk_sp<SkRandomTypeface> face,
const SkScalerContextEffects& effects,
const SkDescriptor* desc,
bool fakeIt)
: SkScalerContext(std::move(face), effects, desc)
, fFakeIt(fakeIt) {
fProxy = this->getRandomTypeface()->proxy()->createScalerContext(effects, desc);
}
unsigned SkRandomScalerContext::generateGlyphCount() {
return fProxy->getGlyphCount();
}
uint16_t SkRandomScalerContext::generateCharToGlyph(SkUnichar uni) {
return fProxy->charToGlyphID(uni);
}
void SkRandomScalerContext::generateAdvance(SkGlyph* glyph) {
fProxy->getAdvance(glyph);
}
void SkRandomScalerContext::generateMetrics(SkGlyph* glyph) {
// Here we will change the mask format of the glyph
// NOTE this is being overridden by the base class
SkMask::Format format = SkMask::kARGB32_Format; // init to handle defective compilers
switch (glyph->getGlyphID() % 4) {
case 0:
format = SkMask::kLCD16_Format;
break;
case 1:
format = SkMask::kA8_Format;
break;
case 2:
format = SkMask::kARGB32_Format;
break;
case 3:
format = SkMask::kBW_Format;
break;
}
fProxy->getMetrics(glyph);
glyph->fMaskFormat = format;
if (fFakeIt) {
return;
}
if (SkMask::kARGB32_Format == format) {
SkPath path;
fProxy->getPath(glyph->getPackedID(), &path);
SkRect storage;
const SkPaint& paint = this->getRandomTypeface()->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();
} else {
SkPath devPath, fillPath;
SkMatrix fillToDevMatrix;
this->internalGetPath(glyph->getPackedID(), &fillPath, &devPath, &fillToDevMatrix);
// just use devPath
const SkIRect ir = devPath.getBounds().roundOut();
if (ir.isEmpty() || !ir.is16Bit()) {
glyph->fLeft = 0;
glyph->fTop = 0;
glyph->fWidth = 0;
glyph->fHeight = 0;
return;
}
glyph->fLeft = ir.fLeft;
glyph->fTop = ir.fTop;
glyph->fWidth = SkToU16(ir.width());
glyph->fHeight = SkToU16(ir.height());
if (glyph->fWidth > 0) {
switch (glyph->fMaskFormat) {
case SkMask::kLCD16_Format:
glyph->fWidth += 2;
glyph->fLeft -= 1;
break;
default:
break;
}
}
}
}
void SkRandomScalerContext::generateImage(const SkGlyph& glyph) {
SkMask::Format format = (SkMask::Format)glyph.fMaskFormat;
switch (glyph.getGlyphID() % 4) {
case 0:
format = SkMask::kLCD16_Format;
break;
case 1:
format = SkMask::kA8_Format;
break;
case 2:
format = SkMask::kARGB32_Format;
break;
case 3:
format = SkMask::kBW_Format;
break;
}
const_cast<SkGlyph&>(glyph).fMaskFormat = format;
// if the format is ARGB, we just draw the glyph from path ourselves. Otherwise, we force
// our proxy context to generate the image from paths.
if (!fFakeIt) {
if (SkMask::kARGB32_Format == glyph.fMaskFormat) {
SkPath path;
fProxy->getPath(glyph.getPackedID(), &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.drawPath(path, this->getRandomTypeface()->paint());
} else {
fProxy->forceGenerateImageFromPath();
fProxy->getImage(glyph);
fProxy->forceOffGenerateImageFromPath();
}
} else {
sk_bzero(glyph.fImage, glyph.computeImageSize());
}
}
void SkRandomScalerContext::generatePath(SkGlyphID glyph, SkPath* path) {
fProxy->generatePath(glyph, path);
}
void SkRandomScalerContext::generateFontMetrics(SkPaint::FontMetrics* metrics) {
fProxy->getFontMetrics(metrics);
}
///////////////////////////////////////////////////////////////////////////////
#include "SkTypefaceCache.h"
SkRandomTypeface::SkRandomTypeface(sk_sp<SkTypeface> proxy, const SkPaint& paint, bool fakeIt)
: SkTypeface(proxy->fontStyle(), false)
, fProxy(std::move(proxy))
, fPaint(paint)
, fFakeIt(fakeIt) {}
SkScalerContext* SkRandomTypeface::onCreateScalerContext(const SkScalerContextEffects& effects,
const SkDescriptor* desc) const {
return new SkRandomScalerContext(sk_ref_sp(const_cast<SkRandomTypeface*>(this)),
effects, desc, fFakeIt);
}
void SkRandomTypeface::onFilterRec(SkScalerContextRec* rec) const {
fProxy->filterRec(rec);
rec->setHinting(SkPaint::kNo_Hinting);
rec->fMaskFormat = SkMask::kARGB32_Format;
}
SkAdvancedTypefaceMetrics* SkRandomTypeface::onGetAdvancedTypefaceMetrics(
PerGlyphInfo info,
const uint32_t* glyphIDs,
uint32_t glyphIDsCount) const {
return fProxy->getAdvancedTypefaceMetrics(info, glyphIDs, glyphIDsCount);
}
SkStreamAsset* SkRandomTypeface::onOpenStream(int* ttcIndex) const {
return fProxy->openStream(ttcIndex);
}
void SkRandomTypeface::onGetFontDescriptor(SkFontDescriptor* desc,
bool* isLocal) const {
fProxy->getFontDescriptor(desc, isLocal);
}
int SkRandomTypeface::onCharsToGlyphs(const void* chars, Encoding encoding,
uint16_t glyphs[], int glyphCount) const {
return fProxy->charsToGlyphs(chars, encoding, glyphs, glyphCount);
}
int SkRandomTypeface::onCountGlyphs() const {
return fProxy->countGlyphs();
}
int SkRandomTypeface::onGetUPEM() const {
return fProxy->getUnitsPerEm();
}
void SkRandomTypeface::onGetFamilyName(SkString* familyName) const {
fProxy->getFamilyName(familyName);
}
SkTypeface::LocalizedStrings* SkRandomTypeface::onCreateFamilyNameIterator() const {
return fProxy->createFamilyNameIterator();
}
int SkRandomTypeface::onGetVariationDesignPosition(
SkFontArguments::VariationPosition::Coordinate coordinates[], int coordinateCount) const
{
return fProxy->onGetVariationDesignPosition(coordinates, coordinateCount);
}
int SkRandomTypeface::onGetTableTags(SkFontTableTag tags[]) const {
return fProxy->getTableTags(tags);
}
size_t SkRandomTypeface::onGetTableData(SkFontTableTag tag, size_t offset,
size_t length, void* data) const {
return fProxy->getTableData(tag, offset, length, data);
}
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