| /* |
| * 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 { |
| |
| #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 |
| |
| 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); |
| 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); |
| }; |
| |
| } |