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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <SkTypeface.h>
#include <SkPaint.h>
#define LOG_TAG "Minikin"
#include <cutils/log.h>
#include "MinikinSkia.h"
namespace android {
MinikinFontSkia::MinikinFontSkia(SkTypeface *typeface) :
mTypeface(typeface) {
}
MinikinFontSkia::~MinikinFontSkia() {
SkSafeUnref(mTypeface);
}
bool MinikinFontSkia::GetGlyph(uint32_t codepoint, uint32_t *glyph) const {
SkPaint paint;
paint.setTypeface(mTypeface);
paint.setTextEncoding(SkPaint::kUTF32_TextEncoding);
uint16_t glyph16;
paint.textToGlyphs(&codepoint, sizeof(codepoint), &glyph16);
*glyph = glyph16;
return !!glyph16;
}
static void MinikinFontSkia_SetSkiaPaint(const MinikinFont* font, SkPaint* skPaint, const MinikinPaint& paint) {
skPaint->setTextEncoding(SkPaint::kGlyphID_TextEncoding);
skPaint->setTextSize(paint.size);
skPaint->setTextScaleX(paint.scaleX);
skPaint->setTextSkewX(paint.skewX);
MinikinFontSkia::unpackPaintFlags(skPaint, paint.paintFlags);
// Apply font fakery on top of user-supplied flags.
MinikinFontSkia::populateSkPaint(skPaint, font, paint.fakery);
}
float MinikinFontSkia::GetHorizontalAdvance(uint32_t glyph_id,
const MinikinPaint &paint) const {
SkPaint skPaint;
uint16_t glyph16 = glyph_id;
SkScalar skWidth;
MinikinFontSkia_SetSkiaPaint(this, &skPaint, paint);
skPaint.getTextWidths(&glyph16, sizeof(glyph16), &skWidth, NULL);
#ifdef VERBOSE
ALOGD("width for typeface %d glyph %d = %f", mTypeface->uniqueID(), glyph_id, skWidth);
#endif
return skWidth;
}
void MinikinFontSkia::GetBounds(MinikinRect* bounds, uint32_t glyph_id,
const MinikinPaint& paint) const {
SkPaint skPaint;
uint16_t glyph16 = glyph_id;
SkRect skBounds;
MinikinFontSkia_SetSkiaPaint(this, &skPaint, paint);
skPaint.getTextWidths(&glyph16, sizeof(glyph16), NULL, &skBounds);
bounds->mLeft = skBounds.fLeft;
bounds->mTop = skBounds.fTop;
bounds->mRight = skBounds.fRight;
bounds->mBottom = skBounds.fBottom;
}
bool MinikinFontSkia::GetTable(uint32_t tag, uint8_t *buf, size_t *size) {
if (buf == NULL) {
const size_t tableSize = mTypeface->getTableSize(tag);
*size = tableSize;
return tableSize != 0;
} else {
const size_t actualSize = mTypeface->getTableData(tag, 0, *size, buf);
*size = actualSize;
return actualSize != 0;
}
}
SkTypeface *MinikinFontSkia::GetSkTypeface() const {
return mTypeface;
}
int32_t MinikinFontSkia::GetUniqueId() const {
return mTypeface->uniqueID();
}
uint32_t MinikinFontSkia::packPaintFlags(const SkPaint* paint) {
uint32_t flags = paint->getFlags();
SkPaint::Hinting hinting = paint->getHinting();
// select only flags that might affect text layout
flags &= (SkPaint::kAntiAlias_Flag | SkPaint::kFakeBoldText_Flag | SkPaint::kLinearText_Flag |
SkPaint::kSubpixelText_Flag | SkPaint::kDevKernText_Flag |
SkPaint::kEmbeddedBitmapText_Flag | SkPaint::kAutoHinting_Flag |
SkPaint::kVerticalText_Flag);
flags |= (hinting << 16);
return flags;
}
void MinikinFontSkia::unpackPaintFlags(SkPaint* paint, uint32_t paintFlags) {
paint->setFlags(paintFlags & SkPaint::kAllFlags);
paint->setHinting(static_cast<SkPaint::Hinting>(paintFlags >> 16));
}
void MinikinFontSkia::populateSkPaint(SkPaint* paint, const MinikinFont* font, FontFakery fakery) {
paint->setTypeface(reinterpret_cast<const MinikinFontSkia*>(font)->GetSkTypeface());
paint->setFakeBoldText(paint->isFakeBoldText() || fakery.isFakeBold());
if (fakery.isFakeItalic()) {
paint->setTextSkewX(paint->getTextSkewX() - 0.25f);
}
}
}
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