base_font_truetype.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

/*
 * This file is based on WME Lite.
 * http://dead-code.org/redir.php?target=wmelite
 * Copyright (c) 2011 Jan Nedoma
 */

#ifndef WINTERMUTE_BASE_FONTTT_H
#define WINTERMUTE_BASE_FONTTT_H

#include "engines/wintermute/base/font/base_font_storage.h"
#include "engines/wintermute/base/font/base_font.h"
#include "engines/wintermute/base/gfx/base_surface.h"
#include "common/rect.h"
#include "graphics/surface.h"
#include "graphics/font.h"

#define NUM_CACHED_TEXTS 30

namespace Wintermute {

class BaseFontTT : public BaseFont {
private:
    class BaseCachedTTFontText {
    public:
        WideString _text;
        int32 _width;
        TTextAlign _align;
        int32 _maxHeight;
        int32 _maxLength;
        BaseSurface *_surface;
        //int32 _priority;
        int32 _textOffset;
        bool _marked;
        uint32 _lastUsed;

        BaseCachedTTFontText() : _text() {
            //_text = L"";
            _width = _maxHeight = _maxLength = -1;
            _align = TAL_LEFT;
            _surface = nullptr;
            //_priority = -1;
            _textOffset = 0;
            _lastUsed = 0;
            _marked = false;
        }

        virtual ~BaseCachedTTFontText() {
            if (_surface) {
                delete _surface;
            }
        }
    };

public:
    class BaseTTFontLayer {
    public:
        BaseTTFontLayer() {
            _offsetX = _offsetY = 0;
            _color = 0x00000000;
        }

        bool persist(BasePersistenceManager *persistMgr) {
            persistMgr->transferSint32(TMEMBER(_offsetX));
            persistMgr->transferSint32(TMEMBER(_offsetY));
            persistMgr->transferUint32(TMEMBER(_color));
            return STATUS_OK;
        }

        int32 _offsetX;
        int32 _offsetY;
        uint32 _color;
    };

    class TextLine {
    public:
        TextLine(const WideString &text, int32 width) {
            _text = text;
            _width = width;
        }

        const WideString &getText() const {
            return _text;
        }
        int32 getWidth() const {
            return _width;
        }

    private:
        WideString _text;
        int32 _width;
    };
    typedef Common::List<TextLine *> TextLineList;

public:
    DECLARE_PERSISTENT(BaseFontTT, BaseFont)
    BaseFontTT(BaseGame *inGame);
    ~BaseFontTT() override;

    int getTextWidth(const byte *text, int maxLength = -1) override;
    int getTextHeight(const byte *text, int width) override;
    void drawText(const byte *text, int x, int y, int width, TTextAlign align = TAL_LEFT, int max_height = -1, int maxLength = -1) override;
    int getLetterHeight() override;

    bool loadBuffer(char *buffer);
    bool loadFile(const char *filename);

    float getLineHeight() const {
        return _lineHeight;
    }

    void afterLoad() override;
    void initLoop() override;

private:
    bool parseLayer(BaseTTFontLayer *layer, char *buffer);

    int32 wrapText(const WideString &text, int32 maxWidth, int32 maxHeight, TextLineList &lines);
    void measureText(const WideString &text, int maxWidth, int maxHeight, int &textWidth, int &textHeight);
    float getKerning(wchar_t leftChar, wchar_t rightChar);

    BaseSurface *renderTextToTexture(const WideString &text, int width, TTextAlign align, int maxHeight, int &textOffset);

    BaseCachedTTFontText *_cachedTexts[NUM_CACHED_TEXTS];

    bool initFont();

    Graphics::Font *_deletableFont;
    const Graphics::Font *_font;
    const Graphics::Font *_fallbackFont;

    float _lineHeight;

    size_t _maxCharWidth;
    size_t _maxCharHeight;

private:
    bool _isBold;
    bool _isItalic;
    bool _isUnderline;
    bool _isStriked;
    int32 _fontHeight;
    char *_fontFile;
    TTextCharset _charset;

    BaseArray<BaseTTFontLayer *> _layers;
    void clearCache();
};

} // End of namespace Wintermute

#endif