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/*
* Copyright (C) 2010 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.
*/
#define LOG_TAG "TextLayout"
#include "TextLayout.h"
#include "TextLayoutCache.h"
#include <android_runtime/AndroidRuntime.h>
#include "SkTemplates.h"
#include "unicode/ubidi.h"
#include "unicode/ushape.h"
#include <utils/Log.h>
namespace android {
// Returns true if we might need layout. If bidiFlags force LTR, assume no layout, if
// bidiFlags indicate there probably is RTL, assume we do, otherwise scan the text
// looking for a character >= the first RTL character in unicode and assume we do if
// we find one.
bool TextLayout::needsLayout(const jchar* text, jint len, jint bidiFlags) {
if (bidiFlags == kBidi_Force_LTR) {
return false;
}
if ((bidiFlags == kBidi_RTL) || (bidiFlags == kBidi_Default_RTL) ||
bidiFlags == kBidi_Force_RTL) {
return true;
}
for (int i = 0; i < len; ++i) {
if (text[i] >= UNICODE_FIRST_RTL_CHAR) {
return true;
}
}
return false;
}
// Draws or gets the path of a paragraph of text on a single line, running bidi and shaping.
// This will draw if canvas is not null, otherwise path must be non-null and it will create
// a path representing the text that would have been drawn.
void TextLayout::handleText(SkPaint *paint, const jchar* text, jsize len,
jint bidiFlags, jfloat x, jfloat y, SkPath *path) {
sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(paint,
text, 0, len, len, bidiFlags);
if (value == NULL) {
return ;
}
// Beware: this needs Glyph encoding (already done on the Paint constructor)
paint->getTextPath(value->getGlyphs(), value->getGlyphsCount() * 2, x, y, path);
}
void TextLayout::getTextRunAdvances(SkPaint* paint, const jchar* chars, jint start,
jint count, jint contextCount, jint dirFlags,
jfloat* resultAdvances, jfloat* resultTotalAdvance) {
sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(paint,
chars, start, count, contextCount, dirFlags);
if (value == NULL) {
return ;
}
if (resultAdvances) {
memcpy(resultAdvances, value->getAdvances(), value->getAdvancesCount() * sizeof(jfloat));
}
if (resultTotalAdvance) {
*resultTotalAdvance = value->getTotalAdvance();
}
}
void TextLayout::getTextPath(SkPaint *paint, const jchar *text, jsize len,
jint bidiFlags, jfloat x, jfloat y, SkPath *path) {
handleText(paint, text, len, bidiFlags, x, y, path);
}
void TextLayout::drawTextOnPath(SkPaint* paint, const jchar* text, int count,
int bidiFlags, jfloat hOffset, jfloat vOffset,
SkPath* path, SkCanvas* canvas) {
sp<TextLayoutValue> value = TextLayoutEngine::getInstance().getValue(paint,
text, 0, count, count, bidiFlags);
if (value == NULL) {
return;
}
// Beware: this needs Glyph encoding (already done on the Paint constructor)
canvas->drawTextOnPathHV(value->getGlyphs(), value->getGlyphsCount() * 2, *path,
hOffset, vOffset, *paint);
}
}
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