Font

    203 void Font::render(SkPaint* paint, const char *text, uint32_t start, uint32_t len,
    204         int numGlyphs, SkPath* path, float hOffset, float vOffset) {
    205     if (numGlyphs == 0 || text == NULL || len == 0) {
    206         return;
    207     }
    208 
    209     text += start;
    210 
    211     int glyphsCount = 0;
    212     SkFixed prevRsbDelta = 0;
    213 
    214     float penX = 0.0f;
    215 
    216     SkPoint position;
    217     SkVector tangent;
    218 
    219     SkPathMeasure measure(*path, false);
    220     float pathLength = SkScalarToFloat(measure.getLength());
    221 
    222     if (paint->getTextAlign() != SkPaint::kLeft_Align) {
    223         float textWidth = SkScalarToFloat(paint->measureText(text, len));
    224         float pathOffset = pathLength;
    225         if (paint->getTextAlign() == SkPaint::kCenter_Align) {
    226             textWidth *= 0.5f;
    227             pathOffset *= 0.5f;
    228         }
    229         penX += pathOffset - textWidth;
    230     }
    231 
    232     while (glyphsCount < numGlyphs && penX < pathLength) {
    233         glyph_t glyph = GET_GLYPH(text);
    234 
    235         if (IS_END_OF_STRING(glyph)) {
    236             break;
    237         }
    238 
    239         CachedGlyphInfo* cachedGlyph = getCachedGlyph(paint, glyph);
    240         penX += SkFixedToFloat(AUTO_KERN(prevRsbDelta, cachedGlyph->mLsbDelta));
    241         prevRsbDelta = cachedGlyph->mRsbDelta;
    242 
    243         if (cachedGlyph->mIsValid) {
    244             drawCachedGlyph(cachedGlyph, penX, hOffset, vOffset, measure, &position, &tangent);
    245         }
    246 
    247         penX += SkFixedToFloat(cachedGlyph->mAdvanceX);
    248 
    249         glyphsCount++;
    250     }
    251 }