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author | Steve Block <steveblock@google.com> | 2011-05-06 11:45:16 +0100 |
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committer | Steve Block <steveblock@google.com> | 2011-05-12 13:44:10 +0100 |
commit | cad810f21b803229eb11403f9209855525a25d57 (patch) | |
tree | 29a6fd0279be608e0fe9ffe9841f722f0f4e4269 /Source/WebCore/icu/unicode/ushape.h | |
parent | 121b0cf4517156d0ac5111caf9830c51b69bae8f (diff) | |
download | external_webkit-cad810f21b803229eb11403f9209855525a25d57.zip external_webkit-cad810f21b803229eb11403f9209855525a25d57.tar.gz external_webkit-cad810f21b803229eb11403f9209855525a25d57.tar.bz2 |
Merge WebKit at r75315: Initial merge by git.
Change-Id: I570314b346ce101c935ed22a626b48c2af266b84
Diffstat (limited to 'Source/WebCore/icu/unicode/ushape.h')
-rw-r--r-- | Source/WebCore/icu/unicode/ushape.h | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/Source/WebCore/icu/unicode/ushape.h b/Source/WebCore/icu/unicode/ushape.h new file mode 100644 index 0000000..34e81e3 --- /dev/null +++ b/Source/WebCore/icu/unicode/ushape.h @@ -0,0 +1,234 @@ +/* +****************************************************************************** +* +* Copyright (C) 2000-2004, International Business Machines +* Corporation and others. All Rights Reserved. +* +****************************************************************************** +* file name: ushape.h +* encoding: US-ASCII +* tab size: 8 (not used) +* indentation:4 +* +* created on: 2000jun29 +* created by: Markus W. Scherer +*/ + +#ifndef __USHAPE_H__ +#define __USHAPE_H__ + +#include "unicode/utypes.h" + +/** + * \file + * \brief C API: Arabic shaping + * + */ + +/** + * Shape Arabic text on a character basis. + * + * <p>This function performs basic operations for "shaping" Arabic text. It is most + * useful for use with legacy data formats and legacy display technology + * (simple terminals). All operations are performed on Unicode characters.</p> + * + * <p>Text-based shaping means that some character code points in the text are + * replaced by others depending on the context. It transforms one kind of text + * into another. In comparison, modern displays for Arabic text select + * appropriate, context-dependent font glyphs for each text element, which means + * that they transform text into a glyph vector.</p> + * + * <p>Text transformations are necessary when modern display technology is not + * available or when text needs to be transformed to or from legacy formats that + * use "shaped" characters. Since the Arabic script is cursive, connecting + * adjacent letters to each other, computers select images for each letter based + * on the surrounding letters. This usually results in four images per Arabic + * letter: initial, middle, final, and isolated forms. In Unicode, on the other + * hand, letters are normally stored abstract, and a display system is expected + * to select the necessary glyphs. (This makes searching and other text + * processing easier because the same letter has only one code.) It is possible + * to mimic this with text transformations because there are characters in + * Unicode that are rendered as letters with a specific shape + * (or cursive connectivity). They were included for interoperability with + * legacy systems and codepages, and for unsophisticated display systems.</p> + * + * <p>A second kind of text transformations is supported for Arabic digits: + * For compatibility with legacy codepages that only include European digits, + * it is possible to replace one set of digits by another, changing the + * character code points. These operations can be performed for either + * Arabic-Indic Digits (U+0660...U+0669) or Eastern (Extended) Arabic-Indic + * digits (U+06f0...U+06f9).</p> + * + * <p>Some replacements may result in more or fewer characters (code points). + * By default, this means that the destination buffer may receive text with a + * length different from the source length. Some legacy systems rely on the + * length of the text to be constant. They expect extra spaces to be added + * or consumed either next to the affected character or at the end of the + * text.</p> + * + * <p>For details about the available operations, see the description of the + * <code>U_SHAPE_...</code> options.</p> + * + * @param source The input text. + * + * @param sourceLength The number of UChars in <code>source</code>. + * + * @param dest The destination buffer that will receive the results of the + * requested operations. It may be <code>NULL</code> only if + * <code>destSize</code> is 0. The source and destination must not + * overlap. + * + * @param destSize The size (capacity) of the destination buffer in UChars. + * If <code>destSize</code> is 0, then no output is produced, + * but the necessary buffer size is returned ("preflighting"). + * + * @param options This is a 32-bit set of flags that specify the operations + * that are performed on the input text. If no error occurs, + * then the result will always be written to the destination + * buffer. + * + * @param pErrorCode must be a valid pointer to an error code value, + * which must not indicate a failure before the function call. + * + * @return The number of UChars written to the destination buffer. + * If an error occured, then no output was written, or it may be + * incomplete. If <code>U_BUFFER_OVERFLOW_ERROR</code> is set, then + * the return value indicates the necessary destination buffer size. + * @stable ICU 2.0 + */ +U_STABLE int32_t U_EXPORT2 +u_shapeArabic(const UChar *source, int32_t sourceLength, + UChar *dest, int32_t destSize, + uint32_t options, + UErrorCode *pErrorCode); + +/** + * Memory option: allow the result to have a different length than the source. + * @stable ICU 2.0 + */ +#define U_SHAPE_LENGTH_GROW_SHRINK 0 + +/** + * Memory option: the result must have the same length as the source. + * If more room is necessary, then try to consume spaces next to modified characters. + * @stable ICU 2.0 + */ +#define U_SHAPE_LENGTH_FIXED_SPACES_NEAR 1 + +/** + * Memory option: the result must have the same length as the source. + * If more room is necessary, then try to consume spaces at the end of the text. + * @stable ICU 2.0 + */ +#define U_SHAPE_LENGTH_FIXED_SPACES_AT_END 2 + +/** + * Memory option: the result must have the same length as the source. + * If more room is necessary, then try to consume spaces at the beginning of the text. + * @stable ICU 2.0 + */ +#define U_SHAPE_LENGTH_FIXED_SPACES_AT_BEGINNING 3 + +/** Bit mask for memory options. @stable ICU 2.0 */ +#define U_SHAPE_LENGTH_MASK 3 + + +/** Direction indicator: the source is in logical (keyboard) order. @stable ICU 2.0 */ +#define U_SHAPE_TEXT_DIRECTION_LOGICAL 0 + +/** + * Direction indicator: + * the source is in visual LTR order, + * the leftmost displayed character stored first. + * @stable ICU 2.0 + */ +#define U_SHAPE_TEXT_DIRECTION_VISUAL_LTR 4 + +/** Bit mask for direction indicators. @stable ICU 2.0 */ +#define U_SHAPE_TEXT_DIRECTION_MASK 4 + + +/** Letter shaping option: do not perform letter shaping. @stable ICU 2.0 */ +#define U_SHAPE_LETTERS_NOOP 0 + +/** Letter shaping option: replace abstract letter characters by "shaped" ones. @stable ICU 2.0 */ +#define U_SHAPE_LETTERS_SHAPE 8 + +/** Letter shaping option: replace "shaped" letter characters by abstract ones. @stable ICU 2.0 */ +#define U_SHAPE_LETTERS_UNSHAPE 0x10 + +/** + * Letter shaping option: replace abstract letter characters by "shaped" ones. + * The only difference with U_SHAPE_LETTERS_SHAPE is that Tashkeel letters + * are always "shaped" into the isolated form instead of the medial form + * (selecting code points from the Arabic Presentation Forms-B block). + * @stable ICU 2.0 + */ +#define U_SHAPE_LETTERS_SHAPE_TASHKEEL_ISOLATED 0x18 + +/** Bit mask for letter shaping options. @stable ICU 2.0 */ +#define U_SHAPE_LETTERS_MASK 0x18 + + +/** Digit shaping option: do not perform digit shaping. @stable ICU 2.0 */ +#define U_SHAPE_DIGITS_NOOP 0 + +/** + * Digit shaping option: + * Replace European digits (U+0030...) by Arabic-Indic digits. + * @stable ICU 2.0 + */ +#define U_SHAPE_DIGITS_EN2AN 0x20 + +/** + * Digit shaping option: + * Replace Arabic-Indic digits by European digits (U+0030...). + * @stable ICU 2.0 + */ +#define U_SHAPE_DIGITS_AN2EN 0x40 + +/** + * Digit shaping option: + * Replace European digits (U+0030...) by Arabic-Indic digits if the most recent + * strongly directional character is an Arabic letter + * (<code>u_charDirection()</code> result <code>U_RIGHT_TO_LEFT_ARABIC</code> [AL]).<br> + * The direction of "preceding" depends on the direction indicator option. + * For the first characters, the preceding strongly directional character + * (initial state) is assumed to be not an Arabic letter + * (it is <code>U_LEFT_TO_RIGHT</code> [L] or <code>U_RIGHT_TO_LEFT</code> [R]). + * @stable ICU 2.0 + */ +#define U_SHAPE_DIGITS_ALEN2AN_INIT_LR 0x60 + +/** + * Digit shaping option: + * Replace European digits (U+0030...) by Arabic-Indic digits if the most recent + * strongly directional character is an Arabic letter + * (<code>u_charDirection()</code> result <code>U_RIGHT_TO_LEFT_ARABIC</code> [AL]).<br> + * The direction of "preceding" depends on the direction indicator option. + * For the first characters, the preceding strongly directional character + * (initial state) is assumed to be an Arabic letter. + * @stable ICU 2.0 + */ +#define U_SHAPE_DIGITS_ALEN2AN_INIT_AL 0x80 + +/** Not a valid option value. May be replaced by a new option. @stable ICU 2.0 */ +#define U_SHAPE_DIGITS_RESERVED 0xa0 + +/** Bit mask for digit shaping options. @stable ICU 2.0 */ +#define U_SHAPE_DIGITS_MASK 0xe0 + + +/** Digit type option: Use Arabic-Indic digits (U+0660...U+0669). @stable ICU 2.0 */ +#define U_SHAPE_DIGIT_TYPE_AN 0 + +/** Digit type option: Use Eastern (Extended) Arabic-Indic digits (U+06f0...U+06f9). @stable ICU 2.0 */ +#define U_SHAPE_DIGIT_TYPE_AN_EXTENDED 0x100 + +/** Not a valid option value. May be replaced by a new option. @stable ICU 2.0 */ +#define U_SHAPE_DIGIT_TYPE_RESERVED 0x200 + +/** Bit mask for digit type options. @stable ICU 2.0 */ +#define U_SHAPE_DIGIT_TYPE_MASK 0x3f00 + +#endif |