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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkFont.h"
#include "SkTo.h"
#include "SkTypeface.h"
#include "SkUtils.h"
SkFont::SkFont(sk_sp<SkTypeface> face, SkScalar size, SkScalar scaleX, SkScalar skewX, MaskType mt,
uint32_t flags)
: fTypeface(face ? std::move(face) : SkTypeface::MakeDefault())
, fSize(size)
, fScaleX(scaleX)
, fSkewX(skewX)
, fFlags(flags)
, fMaskType(SkToU8(mt))
{
SkASSERT(size > 0);
SkASSERT(scaleX > 0);
SkASSERT(SkScalarIsFinite(skewX));
SkASSERT(0 == (flags & ~kAllFlags));
}
sk_sp<SkFont> SkFont::Make(sk_sp<SkTypeface> face, SkScalar size, SkScalar scaleX, SkScalar skewX,
MaskType mt, uint32_t flags) {
if (size <= 0 || !SkScalarIsFinite(size)) {
return nullptr;
}
if (scaleX <= 0 || !SkScalarIsFinite(scaleX)) {
return nullptr;
}
if (!SkScalarIsFinite(skewX)) {
return nullptr;
}
flags &= kAllFlags;
return sk_sp<SkFont>(new SkFont(std::move(face), size, scaleX, skewX, mt, flags));
}
sk_sp<SkFont> SkFont::Make(sk_sp<SkTypeface> face, SkScalar size, MaskType mt, uint32_t flags) {
return SkFont::Make(std::move(face), size, 1, 0, mt, flags);
}
sk_sp<SkFont> SkFont::makeWithSize(SkScalar newSize) const {
return SkFont::Make(sk_ref_sp(this->getTypeface()), newSize, this->getScaleX(),
this->getSkewX(), this->getMaskType(), this->getFlags());
}
sk_sp<SkFont> SkFont::makeWithFlags(uint32_t newFlags) const {
return SkFont::Make(sk_ref_sp(this->getTypeface()), this->getSize(), this->getScaleX(),
this->getSkewX(), this->getMaskType(), newFlags);
}
///////////////////////////////////////////////////////////////////////////////////////////////////
int SkFont::textToGlyphs(const void* text, size_t byteLength, SkTextEncoding encoding,
uint16_t glyphs[], int maxGlyphCount) const {
if (0 == byteLength) {
return 0;
}
SkASSERT(text);
int count = 0; // fix uninitialized warning (even though the switch is complete!)
switch (encoding) {
case kUTF8_SkTextEncoding:
count = SkUTF::CountUTF8((const char*)text, byteLength);
break;
case kUTF16_SkTextEncoding:
count = SkUTF::CountUTF16((const uint16_t*)text, byteLength);
break;
case kUTF32_SkTextEncoding:
count = SkToInt(byteLength >> 2);
break;
case kGlyphID_SkTextEncoding:
count = SkToInt(byteLength >> 1);
break;
}
if (!glyphs) {
return count;
}
// TODO: unify/eliminate SkTypeface::Encoding with SkTextEncoding
SkTypeface::Encoding typefaceEncoding;
switch (encoding) {
case kUTF8_SkTextEncoding:
typefaceEncoding = SkTypeface::kUTF8_Encoding;
break;
case kUTF16_SkTextEncoding:
typefaceEncoding = SkTypeface::kUTF16_Encoding;
break;
case kUTF32_SkTextEncoding:
typefaceEncoding = SkTypeface::kUTF32_Encoding;
break;
default:
SkASSERT(kGlyphID_SkTextEncoding == encoding);
// we can early exit, since we already have glyphIDs
memcpy(glyphs, text, count << 1);
return count;
}
(void)fTypeface->charsToGlyphs(text, typefaceEncoding, glyphs, count);
return count;
}
SkScalar SkFont::measureText(const void* text, size_t byteLength, SkTextEncoding encoding) const {
// TODO: need access to the cache
return -1;
}
///////////////////////////////////////////////////////////////////////////////////////////////////
#include "SkPaint.h"
sk_sp<SkFont> SkFont::Testing_CreateFromPaint(const SkPaint& paint) {
uint32_t flags = 0;
if (paint.isVerticalText()) {
flags |= kVertical_Flag;
}
if (paint.isEmbeddedBitmapText()) {
flags |= kEmbeddedBitmaps_Flag;
}
if (paint.isFakeBoldText()) {
flags |= kEmbolden_Flag;
}
if (SkPaint::kFull_Hinting == paint.getHinting()) {
flags |= kEnableByteCodeHints_Flag;
}
if (paint.isAutohinted()) {
flags |= kEnableAutoHints_Flag;
}
if (paint.isSubpixelText() || paint.isLinearText()) {
// this is our default
} else {
flags |= kUseNonlinearMetrics_Flag;
}
MaskType maskType = SkFont::kBW_MaskType;
if (paint.isAntiAlias()) {
maskType = paint.isLCDRenderText() ? kLCD_MaskType : kA8_MaskType;
}
return Make(sk_ref_sp(paint.getTypeface()), paint.getTextSize(), paint.getTextScaleX(),
paint.getTextSkewX(), maskType, flags);
}
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