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/*
* Copyright 2010 Inalogic® Inc.
*
* This program 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 2.1 or 3.0
* of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranties of
* MERCHANTABILITY, SATISFACTORY QUALITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the applicable version of the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of both the GNU Lesser General Public
* License along with this program. If not, see <http://www.gnu.org/licenses/>
*
* Authored by: Jay Taoko <jaytaoko@inalogic.com>
*
*/
#ifndef FONTTEXTURE_H
#define FONTTEXTURE_H
class IOpenGLPixelShader;
namespace nux
{
typedef enum _TextAlignment
{
eAlignTextNone = 0,
eAlignTextLeft = 1,
eAlignTextRight = 2,
eAlignTextCenter = 3,
} TextAlignment;
class StringBBox
{
public:
StringBBox()
{
x = 0;
y = 0;
width = 0;
height = 0;
ybearing = 0;
downline = 0;
};
~StringBBox() {};
int x;
int y;
int width;
int height;
int ybearing; // max ybearing of the string
int downline; // max downline of the string(max space below the baseline)
};
class PageBBox
{
public:
PageBBox()
{
xmin = 0;
ymin = 0;
xmax = 0;
ymax = 0;
x_margin = 0;
y_margin = 0;
};
~PageBBox() {};
INT xmin;
INT ymin;
INT xmax;
INT ymax;
INT x_margin;
INT y_margin;
};
///////////////////////////////////////////////////////////////////////////////////////////////////////
struct CharDescriptor
{
//clean 16 bytes
unsigned short x;
unsigned short y;
unsigned short Width;
unsigned short Height;
short XOffset;
short YOffset;
unsigned short page;
short XAdvance;
short abcA;
short abcB;
short abcC;
CharDescriptor()
: x( 0 )
, y( 0 )
, Width( 0 )
, Height( 0 )
, XOffset( 0 )
, YOffset( 0 )
, page( 0 )
, XAdvance( 0 )
, abcA( 0 )
, abcB( 0 )
, abcC( 0 )
{ }
};
struct KerningPair
{
unsigned short first;
unsigned short second;
short amount;
KerningPair()
: first(0), second(0), amount(0)
{}
};
struct Charset
{
bool italic;
bool bold;
unsigned short LineHeight;
unsigned short Base;
unsigned short Width, Height;
unsigned short Pages;
unsigned short FontHeight;
unsigned short Ascent;
unsigned short Descent;
int AvgCharWidth;
int MaxCharWidth;
int InternalLeading;
int ExternalLeading;
unsigned short NumChar;
CharDescriptor Chars[256];
unsigned short NumKerningPairs;
KerningPair *Kerning;
Charset()
: italic(false), bold(false), LineHeight(0), Base(0), Width(0), Height(0)
, Pages(0), FontHeight(0), Ascent(0), Descent(0), AvgCharWidth(0)
, MaxCharWidth(0), InternalLeading(0), ExternalLeading(0)
, NumChar(0), NumKerningPairs(0), Kerning(NULL)
{}
~Charset()
{
delete [] Kerning;
}
};
// Information about a glyph. Tex_y2 can be calculated from tex_y1
// and _tex_line_height(see below). Advance is the width of the
// glyph in screen space.
struct Glyph
{
float tex_x1, tex_y1, tex_x2;
int advance;
};
class FontRenderer;
////////////////////////////////////////////////////////////////////////////////////////////////////
// This font system loads in a custom file containing a gray scale
// texture(used as alpha texture) with all the letters on it, and
// information about what glyph is where.
class FontTexture: public Object
{
public:
NUX_DECLARE_OBJECT_TYPE(FontTexture, Object);
FontTexture(const char *FontFile, NUX_FILE_LINE_PROTO);
FontTexture(INT width, INT height, BYTE *Texture);
~FontTexture();
// The line height is a constant;
int GetLineHeight() const
{
return m_Charset.FontHeight;
}
// Knowing the width of a character or a string can be useful if you
// want your UI to look good at all.
int GetCharWidth(const char &c) const;
int GetStringWidth(const NString &str) const;
int GetCharStringWidth(const char *str) const;
int GetStringWidth(const NString &str, int num_char_to_compute) const;
int GetCharStringWidth(const char *str, int num_char_to_compute) const;
int GetFontHeight();
// CursorPosToX(similar to ScriptStringCPtoX from microsoft UniScript)
// The CursorPosToX function returns the x-coordinate for the leading or trailing edge of a character position.
// Parameters
// icp
// [in] Character position in the string.
// fTrailing
// [in] Indicates the edge of the icp that corresponds to the x coordinate. If TRUE, it indicates the trailing edge. If FALSE, it indicates the leading edge.
// pX
// [out] Pointer to a variable that receives the corresponding x coordinate for the icp.
//
// Return Values
// If the function succeeds, it returns S_OK.
// If the function fails, it returns an HRESULT.
// The return value can be tested with the SUCCEEDED and FAILED macros.
bool CursorPosToX(const NString &Str,
int icp,
bool fTrailing,
int *pX);
// XToCursorPosition(similar to ScriptStringXtoCP from microsoft UniScript)
// The XToCursorPosition function converts an x-coordinate to a character position.
//
// Parameters
// iX
// [in] Specifies the x coordinate.
// FirstVisibleCharIndex,
// [in] Index of the first visible character in the text box
// piCh
// [out] Pointer to a variable that receives the character position corresponding to iX.
// piTrailing
// [out] Pointer to a variable that receives an indicator whether the position is the leading or trailing edge of the character.
//
// Return Values
// If the function is successful, it returns S_OK.
// If the function fails, it returns an HRESULT.
// The return value can be tested with the SUCCEEDED and FAILED macros.
bool XToCursorPosition(const NString &Str,
int iX,
unsigned int FirstVisibleCharIndex,
int *piCh,
int *piTrailing);
bool BMFontParseFNT( std::istream &Stream);
const Charset &GetFontInfo() const;
std::vector<BaseTexture*> TextureArray;
private:
INT _RefCount;
INT _textureBMF;
std::vector<unsigned int> m_gl_texture_id;
Charset m_Charset;
friend class FontRenderer;
};
}
#endif //FONTTEXTURE_H
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