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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"
#include "TextLayoutCache.h"
namespace android {
#define UNICODE_NOT_A_CHAR 0xffff
#define UNICODE_ZWSP 0x200b
#define UNICODE_FIRST_LOW_SURROGATE 0xdc00
#define UNICODE_FIRST_HIGH_SURROGATE 0xd800
#define UNICODE_FIRST_PRIVATE_USE 0xe000
#define UNICODE_FIRST_RTL_CHAR 0x0590
/*
* Temporary buffer size
*/
#define CHAR_BUFFER_SIZE 80
/**
* Turn on for using the Cache
*/
#define USE_TEXT_LAYOUT_CACHE 1
#if USE_TEXT_LAYOUT_CACHE
static TextLayoutCache gTextLayoutCache;
#endif
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 getTextRunAdvancesICU(SkPaint* paint, const jchar* chars, jint start,
jint count, jint contextCount, jint dirFlags,
jfloat* resultAdvances, jfloat& resultTotalAdvance);
static void getTextRunAdvancesHB(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);
static bool prepareRtlTextRun(const jchar* context, jsize start, jsize& count,
jsize contextCount, jchar* shaped);
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);
};
} // namespace android
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