android minikin的功能,MinikinSkia.cpp

weixin_39903538

于 2021-05-26 19:54:16 发布

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文章标签： android minikin的功能

此博客展示了Android中MinikinFontSkia相关功能的C++代码实现，包含构造与析构函数，以及获取字形、设置SkPaint、获取水平间距、获取边界、获取字体表等功能函数，还涉及字体标志的打包与解包等操作。

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* 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 #include #define LOG_TAG "Minikin"

#include #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(paintFlags >> 16));

}

void MinikinFontSkia::populateSkPaint(SkPaint* paint, const MinikinFont* font, FontFakery fakery) {

paint->setTypeface(reinterpret_cast(font)->GetSkTypeface());

paint->setFakeBoldText(paint->isFakeBoldText() || fakery.isFakeBold());

if (fakery.isFakeItalic()) {

paint->setTextSkewX(paint->getTextSkewX() - 0.25f);

}

C++程序

127行

4.2 KB

* 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

#define LOG_TAG "Minikin"

#include

#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<:hinting>(paintFlags >> 16));

}

void MinikinFontSkia::populateSkPaint(SkPaint* paint, const MinikinFont* font, FontFakery fakery) {

paint->setTypeface(reinterpret_cast(font)->GetSkTypeface());

paint->setFakeBoldText(paint->isFakeBoldText() || fakery.isFakeBold());

if (fakery.isFakeItalic()) {

paint->setTextSkewX(paint->getTextSkewX() - 0.25f);

}