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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.
*/
#include "jni.h"
#include "SkCanvas.h"
#include "SkPaint.h"
#include "unicode/utypes.h"
namespace android {
class TextLayout {
public:
enum {
kDirection_LTR = 0,
kDirection_RTL = 1,
kDirection_Mask = 0x1
};
enum {
kBidi_LTR = 0,
kBidi_RTL = 1,
kBidi_Default_LTR = 2,
kBidi_Default_RTL = 3,
kBidi_Force_LTR = 4,
kBidi_Force_RTL = 5,
kBidi_Mask = 0x7
};
/*
* Draws a unidirectional run of text.
*/
static void drawTextRun(SkPaint* paint, const jchar* chars,
jint start, jint count, jint contextCount,
int dirFlags, jfloat x, jfloat y, SkCanvas* canvas);
static void getTextRunAdvances(SkPaint *paint, const jchar *chars, jint start,
jint count, jint contextCount, jint dirFlags,
jfloat *resultAdvances, jfloat &resultTotalAdvance);
static void drawText(SkPaint* paint, const jchar* text, jsize len,
jint bidiFlags, jfloat x, jfloat y, SkCanvas* canvas);
static void getTextPath(SkPaint *paint, const jchar *text, jsize len,
jint bidiFlags, jfloat x, jfloat y, SkPath *path);
static void drawTextOnPath(SkPaint* paint, const jchar* text, jsize len,
int bidiFlags, jfloat hOffset, jfloat vOffset,
SkPath* path, SkCanvas* canvas);
static bool prepareText(SkPaint *paint, const jchar* text, jsize len, jint bidiFlags,
const jchar** outText, int32_t* outBytes, jchar** outBuffer);
private:
static bool needsLayout(const jchar* text, jint len, jint bidiFlags);
static int shapeRtlText(const jchar* context, jsize start, jsize count, jsize contextCount,
jchar* shaped, UErrorCode &status);
static jint layoutLine(const jchar* text, jint len, jint flags, int &dir, jchar* buffer,
UErrorCode &status);
static void handleText(SkPaint *paint, const jchar* text, jsize len,
int bidiFlags, jfloat x, jfloat y,SkCanvas *canvas, SkPath *path);
};
}
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