textrender.h

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/* (c) Magnus Auvinen. See licence.txt in the root of the distribution for more information. */
/* If you are missing that file, acquire a complete release at teeworlds.com.                */
#ifndef ENGINE_TEXTRENDER_H
#define ENGINE_TEXTRENDER_H
#include "kernel.h"
 
#include <base/color.h>
 
#include <engine/graphics.h>
 
#include <cstdint>
#include <memory>
 
enum
{
    TEXTFLAG_RENDER = 1 << 0,
    TEXTFLAG_DISALLOW_NEWLINE = 1 << 1,
    TEXTFLAG_STOP_AT_END = 1 << 2,
    TEXTFLAG_ELLIPSIS_AT_END = 1 << 3,
};
 
enum ETextAlignment
{
    TEXTALIGN_LEFT = 0,
    TEXTALIGN_CENTER = 1 << 1,
    TEXTALIGN_RIGHT = 1 << 2,
    TEXTALIGN_TOP = 0, // this is also 0, so the default alignment is top-left
    TEXTALIGN_MIDDLE = 1 << 3,
    TEXTALIGN_BOTTOM = 1 << 4,
 
    TEXTALIGN_TL = TEXTALIGN_TOP | TEXTALIGN_LEFT,
    TEXTALIGN_TC = TEXTALIGN_TOP | TEXTALIGN_CENTER,
    TEXTALIGN_TR = TEXTALIGN_TOP | TEXTALIGN_RIGHT,
    TEXTALIGN_ML = TEXTALIGN_MIDDLE | TEXTALIGN_LEFT,
    TEXTALIGN_MC = TEXTALIGN_MIDDLE | TEXTALIGN_CENTER,
    TEXTALIGN_MR = TEXTALIGN_MIDDLE | TEXTALIGN_RIGHT,
    TEXTALIGN_BL = TEXTALIGN_BOTTOM | TEXTALIGN_LEFT,
    TEXTALIGN_BC = TEXTALIGN_BOTTOM | TEXTALIGN_CENTER,
    TEXTALIGN_BR = TEXTALIGN_BOTTOM | TEXTALIGN_RIGHT,
 
    TEXTALIGN_MASK_HORIZONTAL = TEXTALIGN_LEFT | TEXTALIGN_CENTER | TEXTALIGN_RIGHT,
    TEXTALIGN_MASK_VERTICAL = TEXTALIGN_TOP | TEXTALIGN_MIDDLE | TEXTALIGN_BOTTOM,
};
 
enum ETextRenderFlags
{
    TEXT_RENDER_FLAG_NO_X_BEARING = 1 << 0,
    TEXT_RENDER_FLAG_NO_Y_BEARING = 1 << 1,
    TEXT_RENDER_FLAG_ONLY_ADVANCE_WIDTH = 1 << 2,
    TEXT_RENDER_FLAG_NO_PIXEL_ALIGNMENT = 1 << 3,
    TEXT_RENDER_FLAG_KERNING = 1 << 4,
    TEXT_RENDER_FLAG_NO_OVERSIZE = 1 << 5,
    TEXT_RENDER_FLAG_NO_FIRST_CHARACTER_X_BEARING = 1 << 6,
    TEXT_RENDER_FLAG_NO_LAST_CHARACTER_ADVANCE = 1 << 7,
    TEXT_RENDER_FLAG_NO_AUTOMATIC_QUAD_UPLOAD = 1 << 8,
    // text is only rendered once and then discarded (a hint for buffer creation)
    TEXT_RENDER_FLAG_ONE_TIME_USE = 1 << 9,
};
 
enum class EFontPreset
{
    DEFAULT_FONT,
    ICON_FONT,
};
 
namespace FontIcons
{
    // Each font icon is named according to its official name in Font Awesome
    [[maybe_unused]] static const char *FONT_ICON_PLUS = "+";
    [[maybe_unused]] static const char *FONT_ICON_MINUS = "-";
    [[maybe_unused]] static const char *FONT_ICON_LOCK = "\xEF\x80\xA3";
    [[maybe_unused]] static const char *FONT_ICON_MAGNIFYING_GLASS = "\xEF\x80\x82";
    [[maybe_unused]] static const char *FONT_ICON_HEART = "\xEF\x80\x84";
    [[maybe_unused]] static const char *FONT_ICON_HEART_CRACK = "\xEF\x9E\xA9";
    [[maybe_unused]] static const char *FONT_ICON_STAR = "\xEF\x80\x85";
    [[maybe_unused]] static const char *FONT_ICON_XMARK = "\xEF\x80\x8D";
    [[maybe_unused]] static const char *FONT_ICON_CIRCLE = "\xEF\x84\x91";
    [[maybe_unused]] static const char *FONT_ICON_ARROW_ROTATE_LEFT = "\xEF\x83\xA2";
    [[maybe_unused]] static const char *FONT_ICON_ARROW_ROTATE_RIGHT = "\xEF\x80\x9E";
    [[maybe_unused]] static const char *FONT_ICON_FLAG_CHECKERED = "\xEF\x84\x9E";
    [[maybe_unused]] static const char *FONT_ICON_BAN = "\xEF\x81\x9E";
    [[maybe_unused]] static const char *FONT_ICON_CIRCLE_CHEVRON_DOWN = "\xEF\x84\xBA";
    [[maybe_unused]] static const char *FONT_ICON_KEY = "\xEF\x82\x84";
    [[maybe_unused]] static const char *FONT_ICON_SQUARE_MINUS = "\xEF\x85\x86";
    [[maybe_unused]] static const char *FONT_ICON_SQUARE_PLUS = "\xEF\x83\xBE";
    [[maybe_unused]] static const char *FONT_ICON_SORT_UP = "\xEF\x83\x9E";
    [[maybe_unused]] static const char *FONT_ICON_SORT_DOWN = "\xEF\x83\x9D";
    [[maybe_unused]] static const char *FONT_ICON_TRIANGLE_EXCLAMATION = "\xEF\x81\xB1";
 
    [[maybe_unused]] static const char *FONT_ICON_HOUSE = "\xEF\x80\x95";
    [[maybe_unused]] static const char *FONT_ICON_BOOKMARK = "\xEF\x80\xAE";
    [[maybe_unused]] static const char *FONT_ICON_NEWSPAPER = "\xEF\x87\xAA";
    [[maybe_unused]] static const char *FONT_ICON_POWER_OFF = "\xEF\x80\x91";
    [[maybe_unused]] static const char *FONT_ICON_GEAR = "\xEF\x80\x93";
    [[maybe_unused]] static const char *FONT_ICON_PEN_TO_SQUARE = "\xEF\x81\x84";
    [[maybe_unused]] static const char *FONT_ICON_CLAPPERBOARD = "\xEE\x84\xB1";
    [[maybe_unused]] static const char *FONT_ICON_EARTH_AMERICAS = "\xEF\x95\xBD";
    [[maybe_unused]] static const char *FONT_ICON_NETWORK_WIRED = "\xEF\x9B\xBF";
    [[maybe_unused]] static const char *FONT_ICON_LIST_UL = "\xEF\x83\x8A";
    [[maybe_unused]] static const char *FONT_ICON_INFO = "\xEF\x84\xA9";
    [[maybe_unused]] static const char *FONT_ICON_TERMINAL = "\xEF\x84\xA0";
 
    [[maybe_unused]] static const char *FONT_ICON_SLASH = "\xEF\x9C\x95";
    [[maybe_unused]] static const char *FONT_ICON_PLAY = "\xEF\x81\x8B";
    [[maybe_unused]] static const char *FONT_ICON_PAUSE = "\xEF\x81\x8C";
    [[maybe_unused]] static const char *FONT_ICON_STOP = "\xEF\x81\x8D";
    [[maybe_unused]] static const char *FONT_ICON_CHEVRON_LEFT = "\xEF\x81\x93";
    [[maybe_unused]] static const char *FONT_ICON_CHEVRON_RIGHT = "\xEF\x81\x94";
    [[maybe_unused]] static const char *FONT_ICON_CHEVRON_UP = "\xEF\x81\xB7";
    [[maybe_unused]] static const char *FONT_ICON_CHEVRON_DOWN = "\xEF\x81\xB8";
    [[maybe_unused]] static const char *FONT_ICON_BACKWARD = "\xEF\x81\x8A";
    [[maybe_unused]] static const char *FONT_ICON_FORWARD = "\xEF\x81\x8E";
    [[maybe_unused]] static const char *FONT_ICON_RIGHT_FROM_BRACKET = "\xEF\x8B\xB5";
    [[maybe_unused]] static const char *FONT_ICON_RIGHT_TO_BRACKET = "\xEF\x8B\xB6";
    [[maybe_unused]] static const char *FONT_ICON_ARROW_UP_RIGHT_FROM_SQUARE = "\xEF\x82\x8E";
    [[maybe_unused]] static const char *FONT_ICON_BACKWARD_STEP = "\xEF\x81\x88";
    [[maybe_unused]] static const char *FONT_ICON_FORWARD_STEP = "\xEF\x81\x91";
    [[maybe_unused]] static const char *FONT_ICON_BACKWARD_FAST = "\xEF\x81\x89";
    [[maybe_unused]] static const char *FONT_ICON_FORWARD_FAST = "\xEF\x81\x90";
    [[maybe_unused]] static const char *FONT_ICON_KEYBOARD = "\xE2\x8C\xA8";
    [[maybe_unused]] static const char *FONT_ICON_ELLIPSIS = "\xEF\x85\x81";
 
    [[maybe_unused]] static const char *FONT_ICON_FOLDER = "\xEF\x81\xBB";
    [[maybe_unused]] static const char *FONT_ICON_FOLDER_OPEN = "\xEF\x81\xBC";
    [[maybe_unused]] static const char *FONT_ICON_FOLDER_TREE = "\xEF\xA0\x82";
    [[maybe_unused]] static const char *FONT_ICON_FILM = "\xEF\x80\x88";
    [[maybe_unused]] static const char *FONT_ICON_VIDEO = "\xEF\x80\xBD";
    [[maybe_unused]] static const char *FONT_ICON_MAP = "\xEF\x89\xB9";
    [[maybe_unused]] static const char *FONT_ICON_IMAGE = "\xEF\x80\xBE";
    [[maybe_unused]] static const char *FONT_ICON_MUSIC = "\xEF\x80\x81";
    [[maybe_unused]] static const char *FONT_ICON_FILE = "\xEF\x85\x9B";
 
    [[maybe_unused]] static const char *FONT_ICON_PENCIL = "\xEF\x8C\x83";
    [[maybe_unused]] static const char *FONT_ICON_TRASH = "\xEF\x87\xB8";
 
    [[maybe_unused]] static const char *FONT_ICON_ARROWS_LEFT_RIGHT = "\xEF\x8C\xB7";
    [[maybe_unused]] static const char *FONT_ICON_ARROWS_UP_DOWN = "\xEF\x81\xBD";
    [[maybe_unused]] static const char *FONT_ICON_CIRCLE_PLAY = "\xEF\x85\x84";
    [[maybe_unused]] static const char *FONT_ICON_BORDER_ALL = "\xEF\xA1\x8C";
    [[maybe_unused]] static const char *FONT_ICON_EYE = "\xEF\x81\xAE";
    [[maybe_unused]] static const char *FONT_ICON_EYE_SLASH = "\xEF\x81\xB0";
    [[maybe_unused]] static const char *FONT_ICON_EYE_DROPPER = "\xEF\x87\xBB";
    [[maybe_unused]] static const char *FONT_ICON_COMMENT = "\xEF\x81\xB5";
    [[maybe_unused]] static const char *FONT_ICON_COMMENT_SLASH = "\xEF\x92\xB3";
 
    [[maybe_unused]] static const char *FONT_ICON_DICE_ONE = "\xEF\x94\xA5";
    [[maybe_unused]] static const char *FONT_ICON_DICE_TWO = "\xEF\x94\xA8";
    [[maybe_unused]] static const char *FONT_ICON_DICE_THREE = "\xEF\x94\xA7";
    [[maybe_unused]] static const char *FONT_ICON_DICE_FOUR = "\xEF\x94\xA4";
    [[maybe_unused]] static const char *FONT_ICON_DICE_FIVE = "\xEF\x94\xA3";
    [[maybe_unused]] static const char *FONT_ICON_DICE_SIX = "\xEF\x94\xA6";
 
    [[maybe_unused]] static const char *FONT_ICON_LAYER_GROUP = "\xEF\x97\xBD";
    [[maybe_unused]] static const char *FONT_ICON_UNDO = "\xEF\x8B\xAA";
    [[maybe_unused]] static const char *FONT_ICON_REDO = "\xEF\x8B\xB9";
 
    [[maybe_unused]] static const char *FONT_ICON_ARROWS_ROTATE = "\xEF\x80\xA1";
    [[maybe_unused]] static const char *FONT_ICON_QUESTION = "?";
 
    [[maybe_unused]] static const char *FONT_ICON_CAMERA = "\xEF\x80\xB0";
}
 
enum ETextCursorSelectionMode
{
    // ignore any kind of selection
    TEXT_CURSOR_SELECTION_MODE_NONE = 0,
    // calculates the selection based on the mouse press and release cursor position
    TEXT_CURSOR_SELECTION_MODE_CALCULATE,
    // sets the selection based on the character start and end count(these values have to be decoded character offsets)
    TEXT_CURSOR_SELECTION_MODE_SET,
};
 
enum ETextCursorCursorMode
{
    // ignore any kind of cursor
    TEXT_CURSOR_CURSOR_MODE_NONE = 0,
    // calculates the cursor based on the mouse release cursor position
    TEXT_CURSOR_CURSOR_MODE_CALCULATE,
    // sets the cursor based on the current character (this value has to be decoded character offset)
    TEXT_CURSOR_CURSOR_MODE_SET,
};
 
struct STextBoundingBox
{
    float m_X;
    float m_Y;
    float m_W;
    float m_H;
 
    float Right() const { return m_X + m_W; }
    float Bottom() const { return m_Y + m_H; }
    vec2 Size() const { return vec2(m_W, m_H); }
    void MoveBy(vec2 Offset)
    {
        m_X += Offset.x;
        m_Y += Offset.y;
    }
};
 
// Allow to render multi colored text in one go without having to call TextEx() multiple times.
// Needed to allow multi colored multi line texts
struct STextColorSplit
{
    int m_CharIndex; // Which index within the text should the split occur
    int m_Length; // How long is the split
    ColorRGBA m_Color; // The color the text should be starting from m_CharIndex
 
    STextColorSplit(int CharIndex, int Length, const ColorRGBA &Color) :
        m_CharIndex(CharIndex), m_Length(Length), m_Color(Color) {}
};
 
class CTextCursor
{
public:
    int m_Flags = TEXTFLAG_RENDER;
    int m_LineCount = 1;
    int m_GlyphCount = 0;
    int m_CharCount = 0;
    int m_MaxLines = 0;
 
    float m_StartX = 0.0f;
    float m_StartY = 0.0f;
    float m_LineWidth = -1.0f;
    float m_X = 0.0f;
    float m_Y = 0.0f;
    float m_MaxCharacterHeight = 0.0f;
    float m_LongestLineWidth = 0.0f;
 
    float m_FontSize = 0.0f;
    float m_AlignedFontSize = 0.0f;
    float m_LineSpacing = 0.0f;
    float m_AlignedLineSpacing = 0.0f;
 
    ETextCursorSelectionMode m_CalculateSelectionMode = TEXT_CURSOR_SELECTION_MODE_NONE;
    float m_SelectionHeightFactor = 1.0f;
 
    // these coordinates are respected if selection mode is set to calculate @see ETextCursorSelectionMode
    vec2 m_PressMouse = vec2(0.0f, 0.0f);
    // these coordinates are respected if selection/cursor mode is set to calculate @see ETextCursorSelectionMode / @see ETextCursorCursorMode
    vec2 m_ReleaseMouse = vec2(0.0f, 0.0f);
 
    // note m_SelectionStart can be bigger than m_SelectionEnd, depending on how the mouse cursor was dragged
    // also note, that these are the character offsets decoded
    int m_SelectionStart = 0;
    int m_SelectionEnd = 0;
 
    ETextCursorCursorMode m_CursorMode = TEXT_CURSOR_CURSOR_MODE_NONE;
    bool m_ForceCursorRendering = false;
    // note this is the decoded character offset
    int m_CursorCharacter = -1;
    vec2 m_CursorRenderedPosition = vec2(-1.0f, -1.0f);

    bool m_Truncated = false;
 
    // Color splits of the cursor to allow multicolored text
    std::vector<STextColorSplit> m_vColorSplits;
 
    float Height() const;
    STextBoundingBox BoundingBox() const;
    void SetPosition(vec2 Position);
};
 
struct STextContainerUsages
{
    int m_Dummy = 0;
};
 
struct STextContainerIndex
{
    int m_Index;
    std::shared_ptr<STextContainerUsages> m_UseCount =
        std::make_shared<STextContainerUsages>(STextContainerUsages());
 
    STextContainerIndex() { Reset(); }
    bool Valid() const { return m_Index >= 0; }
    void Reset() { m_Index = -1; }
};
 
struct STextSizeProperties
{
    float *m_pHeight = nullptr;
    float *m_pAlignedFontSize = nullptr;
    float *m_pMaxCharacterHeightInLine = nullptr;
    int *m_pLineCount = nullptr;
};
 
class ITextRender : public IInterface
{
    MACRO_INTERFACE("textrender")
public:
    virtual bool LoadFonts() = 0;
    virtual void SetFontPreset(EFontPreset FontPreset) = 0;
    virtual void SetFontLanguageVariant(const char *pLanguageFile) = 0;
 
    virtual void SetRenderFlags(unsigned Flags) = 0;
    virtual unsigned GetRenderFlags() const = 0;
 
    ColorRGBA DefaultTextColor() const { return ColorRGBA(1, 1, 1, 1); }
    ColorRGBA DefaultTextOutlineColor() const { return ColorRGBA(0, 0, 0, 0.3f); }
    ColorRGBA DefaultTextSelectionColor() const { return ColorRGBA(1.0f, 1.0f, 1.0f, 0.5f); }
 
    //
    virtual void TextEx(CTextCursor *pCursor, const char *pText, int Length = -1) = 0;
    virtual bool CreateTextContainer(STextContainerIndex &TextContainerIndex, CTextCursor *pCursor, const char *pText, int Length = -1) = 0;
    virtual void AppendTextContainer(STextContainerIndex TextContainerIndex, CTextCursor *pCursor, const char *pText, int Length = -1) = 0;
    // either creates a new text container or appends to a existing one
    virtual bool CreateOrAppendTextContainer(STextContainerIndex &TextContainerIndex, CTextCursor *pCursor, const char *pText, int Length = -1) = 0;
    // just deletes and creates text container
    virtual void RecreateTextContainer(STextContainerIndex &TextContainerIndex, CTextCursor *pCursor, const char *pText, int Length = -1) = 0;
    virtual void RecreateTextContainerSoft(STextContainerIndex &TextContainerIndex, CTextCursor *pCursor, const char *pText, int Length = -1) = 0;
    virtual void DeleteTextContainer(STextContainerIndex &TextContainerIndex) = 0;
 
    virtual void UploadTextContainer(STextContainerIndex TextContainerIndex) = 0;
 
    virtual void RenderTextContainer(STextContainerIndex TextContainerIndex, const ColorRGBA &TextColor, const ColorRGBA &TextOutlineColor) = 0;
    virtual void RenderTextContainer(STextContainerIndex TextContainerIndex, const ColorRGBA &TextColor, const ColorRGBA &TextOutlineColor, float X, float Y) = 0;
 
    virtual STextBoundingBox GetBoundingBoxTextContainer(STextContainerIndex TextContainerIndex) = 0;
 
    virtual void UploadEntityLayerText(const CImageInfo &TextImage, int TexSubWidth, int TexSubHeight, const char *pText, int Length, float x, float y, int FontSize) = 0;
    virtual int AdjustFontSize(const char *pText, int TextLength, int MaxSize, int MaxWidth) const = 0;
    virtual float GetGlyphOffsetX(int FontSize, char TextCharacter) const = 0;
    virtual int CalculateTextWidth(const char *pText, int TextLength, int FontWidth, int FontSize) const = 0;
 
    // old foolish interface
    virtual void TextColor(float r, float g, float b, float a) = 0;
    virtual void TextColor(ColorRGBA Color) = 0;
    virtual void TextOutlineColor(float r, float g, float b, float a) = 0;
    virtual void TextOutlineColor(ColorRGBA Color) = 0;
    virtual void TextSelectionColor(float r, float g, float b, float a) = 0;
    virtual void TextSelectionColor(ColorRGBA Color) = 0;
    virtual void Text(float x, float y, float Size, const char *pText, float LineWidth = -1.0f) = 0;
    virtual float TextWidth(float Size, const char *pText, int StrLength = -1, float LineWidth = -1.0f, int Flags = 0, const STextSizeProperties &TextSizeProps = {}) = 0;
    virtual STextBoundingBox TextBoundingBox(float Size, const char *pText, int StrLength = -1, float LineWidth = -1.0f, float LineSpacing = 0.0f, int Flags = 0) = 0;
 
    virtual ColorRGBA GetTextColor() const = 0;
    virtual ColorRGBA GetTextOutlineColor() const = 0;
    virtual ColorRGBA GetTextSelectionColor() const = 0;
 
    virtual void OnPreWindowResize() = 0;
    virtual void OnWindowResize() = 0;
};
 
class IEngineTextRender : public ITextRender
{
    MACRO_INTERFACE("enginetextrender")
public:
    virtual void Init() = 0;
    void Shutdown() override = 0;
};
 
extern IEngineTextRender *CreateEngineTextRender();
 
#endif