libgui/include/gui/FreeTypeGX.h

/*
 * FreeTypeGX is a wrapper class for libFreeType which renders a compiled
 * FreeType parsable font into a GX texture for Wii homebrew development.
 * Copyright (C) 2008 Armin Tamzarian
 * Modified by Dimok, 2015 for WiiU GX2
 *
 * This file is part of FreeTypeGX.
 *
 * FreeTypeGX is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * FreeTypeGX 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with FreeTypeGX.  If not, see <http://www.gnu.org/licenses/>.
 */

#pragma once

#include <string>
#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_BITMAP_H

#include <malloc.h>
#include <string.h>
#include <wchar.h>
#include <map>


#include <gui/gx2_ext.h>

#include <gx2/sampler.h>
#include <gx2/texture.h>

#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>

/*! \struct ftgxCharData_
 *
 * Font face character glyph relevant data structure.
 */
typedef struct ftgxCharData_ {
    int16_t renderOffsetX; /**< Texture X axis bearing offset. */
    uint16_t glyphAdvanceX; /**< Character glyph X coordinate advance in pixels. */
    uint16_t glyphAdvanceY; /**< Character glyph Y coordinate advance in pixels. */
    uint32_t glyphIndex; /**< Charachter glyph index in the font face. */

    int16_t renderOffsetY; /**< Texture Y axis bearing offset. */
    int16_t renderOffsetMax; /**< Texture Y axis bearing maximum value. */
    int16_t renderOffsetMin; /**< Texture Y axis bearing minimum value. */

    GX2Texture *texture;
} ftgxCharData;

/*! \struct ftgxDataOffset_
 *
 * Offset structure which hold both a maximum and minimum value.
 */
typedef struct ftgxDataOffset_ {
    int16_t ascender; /**< Maximum data offset. */
    int16_t descender; /**< Minimum data offset. */
    int16_t max; /**< Maximum data offset. */
    int16_t min; /**< Minimum data offset. */
} ftgxDataOffset;

typedef struct ftgxCharData_ ftgxCharData;
typedef struct ftgxDataOffset_ ftgxDataOffset;
#define _TEXT(t) L ## t /**< Unicode helper macro. */

#define FTGX_NULL               0x0000
#define FTGX_JUSTIFY_LEFT       0x0001
#define FTGX_JUSTIFY_CENTER     0x0002
#define FTGX_JUSTIFY_RIGHT      0x0004
#define FTGX_JUSTIFY_MASK       0x000f

#define FTGX_ALIGN_TOP          0x0010
#define FTGX_ALIGN_MIDDLE       0x0020
#define FTGX_ALIGN_BOTTOM       0x0040
#define FTGX_ALIGN_BASELINE     0x0080
#define FTGX_ALIGN_GLYPH_TOP    0x0100
#define FTGX_ALIGN_GLYPH_MIDDLE 0x0200
#define FTGX_ALIGN_GLYPH_BOTTOM 0x0400
#define FTGX_ALIGN_MASK         0x0ff0

#define FTGX_STYLE_UNDERLINE    0x1000
#define FTGX_STYLE_STRIKE       0x2000
#define FTGX_STYLE_MASK         0xf000

/**< Constant color value used only to sanitize Doxygen documentation. */
static const GX2ColorF32 ftgxWhite = (GX2ColorF32) {
        1.0f, 1.0f, 1.0f, 1.0f
};


//! forward declaration
class CVideo;

/*! \class FreeTypeGX
 * \brief Wrapper class for the libFreeType library with GX rendering.
 * \author Armin Tamzarian
 * \version 0.2.4
 *
 * FreeTypeGX acts as a wrapper class for the libFreeType library. It supports precaching of transformed glyph data into
 * a specified texture format. Rendering of the data to the EFB is accomplished through the application of high performance
 * GX texture functions resulting in high throughput of string rendering.
 */
class FreeTypeGX {
private:
    FT_Library ftLibrary; /**< FreeType FT_Library instance. */
    FT_Face ftFace; /**< FreeType reusable FT_Face typographic object. */
    int16_t ftPointSize; /**< Current set size of the rendered font. */
    bool ftKerningEnabled; /**< Flag indicating the availability of font kerning data. */
    uint8_t vertexIndex; /**< Vertex format descriptor index. */
    GX2Sampler ftSampler;

    typedef struct _ftGX2Data {
        ftgxDataOffset ftgxAlign;
        std::map<wchar_t, ftgxCharData> ftgxCharMap;
    } ftGX2Data;

    std::map<int16_t, ftGX2Data> fontData; /**< Map which holds the glyph data structures for the corresponding characters in one size. */

    int16_t getStyleOffsetWidth(uint16_t width, uint16_t format);

    int16_t getStyleOffsetHeight(int16_t format, uint16_t pixelSize);

    void unloadFont();

    ftgxCharData *cacheGlyphData(wchar_t charCode, int16_t pixelSize);

    uint16_t cacheGlyphDataComplete(int16_t pixelSize);

    void loadGlyphData(FT_Bitmap *bmp, ftgxCharData *charData);

    void copyTextureToFramebuffer(CVideo *pVideo, GX2Texture *tex, int16_t screenX, int16_t screenY, int16_t screenZ, const glm::vec4 &color, const float &textBlur, const float &colorBlurIntensity, const glm::vec4 &blurColor,
                                  const float &superSamplingScale);

public:
    FreeTypeGX(const uint8_t *fontBuffer, FT_Long bufferSize, bool lastFace = false);

    ~FreeTypeGX();

    uint16_t drawText(CVideo *pVideo, int16_t x, int16_t y, int16_t z, const wchar_t *text, int16_t pixelSize, const glm::vec4 &color,
                      uint16_t textStyling, uint16_t textWidth, const float &textBlur, const float &colorBlurIntensity, const glm::vec4 &blurColor, const float &superSamplingScale);


    uint16_t getWidth(const wchar_t *text, int16_t pixelSize);

    uint16_t getCharWidth(const wchar_t wChar, int16_t pixelSize, const wchar_t prevChar = 0x0000);

    uint16_t getHeight(const wchar_t *text, int16_t pixelSize);

    void getOffset(const wchar_t *text, int16_t pixelSize, uint16_t widthLimit = 0);

    static wchar_t *charToWideChar(const char *p);

    static char *wideCharToUTF8(const wchar_t *strChar);
};