SkShaper_primitive.cpp File Reference

#include "include/core/SkFont.h"
#include "include/core/SkFontMgr.h"
#include "include/core/SkFontTypes.h"
#include "include/core/SkPoint.h"
#include "include/core/SkScalar.h"
#include "include/core/SkTypes.h"
#include "include/private/base/SkTo.h"
#include "modules/skshaper/include/SkShaper.h"
#include "src/base/SkUTF.h"
#include <cstdint>
#include <cstring>
#include <memory>

Go to the source code of this file.

Classes
class	SkShaperPrimitive

Namespaces
namespace	SkShapers
namespace	SkShapers::Primitive

Functions
static bool	is_breaking_whitespace (SkUnichar c)
static size_t	linebreak (const char text[], const char stop[], const SkFont &font, SkScalar width, SkScalar *advance, size_t *trailing)

Function Documentation

is_breaking_whitespace()

static bool is_breaking_whitespace ( SkUnichar  c )

inlinestatic

Definition at line 52 of file SkShaper_primitive.cpp.

                                                       {
    switch (c) {
        case 0x0020: // SPACE
        //case 0x00A0: // NO-BREAK SPACE
        case 0x1680: // OGHAM SPACE MARK
        case 0x180E: // MONGOLIAN VOWEL SEPARATOR
        case 0x2000: // EN QUAD
        case 0x2001: // EM QUAD
        case 0x2002: // EN SPACE (nut)
        case 0x2003: // EM SPACE (mutton)
        case 0x2004: // THREE-PER-EM SPACE (thick space)
        case 0x2005: // FOUR-PER-EM SPACE (mid space)
        case 0x2006: // SIX-PER-EM SPACE
        case 0x2007: // FIGURE SPACE
        case 0x2008: // PUNCTUATION SPACE
        case 0x2009: // THIN SPACE
        case 0x200A: // HAIR SPACE
        case 0x200B: // ZERO WIDTH SPACE
        case 0x202F: // NARROW NO-BREAK SPACE
        case 0x205F: // MEDIUM MATHEMATICAL SPACE
        case 0x3000: // IDEOGRAPHIC SPACE
        //case 0xFEFF: // ZERO WIDTH NO-BREAK SPACE
            return true;
        default:
            return false;
    }
}

linebreak()

static size_t linebreak ( const char  text[], const char  stop[], const SkFont &  font, SkScalar  width, SkScalar *  advance, size_t *  trailing  )

static

Definition at line 80 of file SkShaper_primitive.cpp.

{
    SkScalar accumulatedWidth = 0;
    int glyphIndex = 0;
    const char* start = text;
    const char* wordStart = text;
    bool prevWS = true;
    *trailing = 0;
 
    while (text < stop) {
        const char* prevText = text;
        SkUnichar uni = SkUTF::NextUTF8(&text, stop);
        accumulatedWidth += advance[glyphIndex++];
        bool currWS = is_breaking_whitespace(uni);
 
        if (!currWS && prevWS) {
            wordStart = prevText;
        }
        prevWS = currWS;
 
        if (width < accumulatedWidth) {
            bool consumeWhitespace = false;
            if (currWS) {
                // previous fit, put this and following whitespace in trailing
                if (prevText == start) {
                    // don't put this in trailing if it's the first thing
                    prevText = text;
                }
                consumeWhitespace = true;
            } else if (wordStart != start) {
                // backup to the last whitespace that fit
                text = wordStart;
            } else if (prevText > start) {
                // backup to just before the glyph that didn't fit
                text = prevText;
            } else {
                // let it overflow, put any following whitespace in trailing
                prevText = text;
                consumeWhitespace = true;
            }
            if (consumeWhitespace) {
                const char* next = text;
                while (next < stop && is_breaking_whitespace(SkUTF::NextUTF8(&next, stop))) {
                    text = next;
                }
                if (trailing) {
                    *trailing = text - prevText;
                }
            }
            break;
        }
    }
 
    return text - start;
}