Method requestCharacters

packages/fairygui/src/text/DynamicFont.ts:249–271

* Request characters to be available in the atlas * 请求字符在图集中可用 * * Similar to Unity's Font.RequestCharactersInTexture

(text: string)

     * Similar to Unity's Font.RequestCharactersInTexture
     */
    public requestCharacters(text: string): void {
        let hasNew = false;

        for (let i = 0; i < text.length; i++) {
            const charCode = text.charCodeAt(i);

            // Skip if already cached
            if (this._glyphs.has(charCode)) continue;

            // Skip control characters
            if (charCode < 32 && charCode !== 9 && charCode !== 10 && charCode !== 13) continue;

            // Render the character
            if (this.renderCharacter(charCode)) {
                hasNew = true;
            }
        }

        // Upload texture if needed
        if (hasNew && this._onTextureUpload && this._dirtyRegion) {
            this.uploadTexture();
        }
    }

    /**
     * Render a character to the atlas