Irrlicht输出中文字符串

Irrlicht输出中文字符串

作者：Kagula

内容概要

以源代码的形式示例，如何让Irrlicht输出中文字符串

读者对象：

熟悉C语言开发工具的程序员

环境

[1]Irrlicht 1.6.1

下载地址：http://irrlicht.sourceforge.net/downloads.html 

[2]Free type 2.3.11

下载地址：http://freetype.sourceforge.net/index2.html 

以MT方式生成freetype2311MT.lib文件

[3] irrKlang-1.1.3

  下载地址：http://www.ambiera.com/irrklang/

[4]VisualStudio2008+SP1

 

正文

在Irrlicht的Hello World例程中使用下面的代码片段实现中文输出

Step1:使用头文件

#define COMPILE_WITH_FREETYPE

#include "gui_freetype_font.h"

Step2:准备中文输出

    CGUITTFace myFace;

    myFace.load("simhei.ttf");

 

     CGUIFreetypeFont myFont(driver);

     myFont.attach(&myFace,16);

Step3:方式一,输出中文

         myFont.draw(L"中华人民共和国",rect<s32>(100,100,222,22),0xffffffff,false,false,NULL);

 

         driver->endScene();//这行代码是原来有的

Step3:方式二,让控件直接支持输出中文

  IGUIEnvironment* env = m_device->getGUIEnvironment();
  IGUISkin* skin = env->getSkin();
  
  m_face = new CGUITTFace();
  m_face->load(filename.c_str());

  m_font = new CGUIFreetypeFont(m_driver);
  m_font->attach(m_face,12);
  skin->setFont(m_font);
  skin->setFont(m_font, EGDF_TOOLTIP);//env->getBuiltInFont()

 

 

上面的代码使用了源自http://www.michaelzeilfelder.de/irrlicht.htm#TrueType地址的

gui_freetype_font.h、gui_freetype_font.cpp文件。我对这两个代码做了些非功能性修改。下面是我修改后的这两个源文件的清单。

Gui_freetype_font.h文件源码

 #ifndef _GUI_FREETYPE_FONT_H #define _GUI_FREETYPE_FONT_H #include <ft2build.h> #include <freetype/freetype.h> #include <irrlicht.h> #define COMPILE_WITH_FREETYPE class CGUITTFace : public irr::IReferenceCounted { public: CGUITTFace(); virtual ~CGUITTFace(); bool load(const irr::io::path& filename); FT_Face face; // handle to face private: static int countClassObjects; static FT_Library library; // handle to library }; class CGUIFreetypeFont; class CGUITTGlyph : public irr::IReferenceCounted { public: CGUITTGlyph(); virtual ~CGUITTGlyph(); bool cached; void cache(irr::u32 idx_, const CGUIFreetypeFont * freetypeFont); //void cache(irr::u32 idx_, CGUITTFace& ttFace, irr::video::IVideoDriver* driver_, irr::core::dimension2d<irr::u32> &largestSize); irr::u32 size; irr::u32 top; irr::u32 left; irr::u32 texw; irr::u32 texh; irr::u32 imgw; irr::u32 imgh; irr::video::ITexture *tex; irr::u32 top16; irr::u32 left16; irr::u32 texw16; irr::u32 texh16; irr::u32 imgw16; irr::u32 imgh16; irr::video::ITexture *tex16; irr::u8 *image; private: void setGlyphTextureFlags(irr::video::IVideoDriver* driver_); void restoreTextureFlags(irr::video::IVideoDriver* driver_); static bool mTexFlag16; static bool mTexFlag32; static bool mTexFlagMip; }; class CGUIFreetypeFont : public irr::gui::IGUIFont { friend class CGUITTGlyph; public: //! constructor CGUIFreetypeFont(irr::video::IVideoDriver* Driver); //! destructor virtual ~CGUIFreetypeFont(); //! loads a truetype font file bool attach(CGUITTFace *Face,irr::u32 size); //! draws an text and clips it to the specified rectangle if wanted virtual void draw(const irr::core::stringw& text, const irr::core::rect<irr::s32>& position, irr::video::SColor color, bool hcenter=false, bool vcenter=false, const irr::core::rect<irr::s32>* clip=0); //! returns the dimension of a text virtual irr::core::dimension2d<irr::u32> getDimension(const wchar_t* text) const; //! Calculates the index of the character in the text which is on a specific position. virtual irr::s32 getCharacterFromPos(const wchar_t* text, irr::s32 pixel_x) const; //! Not yet supported virtual void setKerningWidth (irr::s32 kerning) {} //! Not yet supported virtual void setKerningHeight (irr::s32 kerning) {} //! Not yet supported virtual irr::s32 getKerningWidth(const wchar_t* thisLetter=0, const wchar_t* previousLetter=0) const { return 0; } //! Not yet supported virtual irr::s32 getKerningHeight() const { return 0; } //! Not yet supported virtual void setInvisibleCharacters( const wchar_t *s ) {} bool AntiAlias; bool Transparency; protected: void clearGlyphs(); private: irr::u32 getWidthFromCharacter(wchar_t c) const; irr::u32 getGlyphByChar(wchar_t c) const; irr::video::IVideoDriver* Driver; irr::core::array< CGUITTGlyph* > Glyphs; CGUITTFace * TrueTypeFace; mutable irr::core::dimension2d<irr::u32> LargestGlyph; }; #endif // _GUI_FREETYPE_FONT_H

Gui_freetype_font.cpp文件源码

#include "gui_freetype_font.h" #ifdef COMPILE_WITH_FREETYPE #include <cassert> using namespace irr; using namespace gui; #ifdef _MSC_VER #pragma warning(disable: 4996) #endif // -------------------------------------------------------- CGUITTGlyph::CGUITTGlyph() : IReferenceCounted() ,cached(false) ,size(0) ,top(0) ,left(0) ,texw(0) ,texh(0) ,imgw(0) ,imgh(0) ,tex(NULL) ,top16(0) ,left16(0) ,texw16(0) ,texh16(0) ,imgw16(0) ,imgh16(0) ,tex16(NULL) ,image(NULL) { } CGUITTGlyph::~CGUITTGlyph() { delete[] image; } //void CGUITTGlyph::cache(u32 idx_, CGUITTFace& ttFace_, video::IVideoDriver* driver_, irr::core::dimension2d<irr::u32> &largestSize) void CGUITTGlyph::cache(u32 idx_, const CGUIFreetypeFont * freetypeFont) { assert(freetypeFont); FT_Face face = freetypeFont->TrueTypeFace->face; FT_Set_Pixel_Sizes(face, 0, size); if ( size > freetypeFont->LargestGlyph.Height ) freetypeFont->LargestGlyph.Height = size; if ( !FT_Load_Glyph(face, idx_, FT_LOAD_NO_HINTING|FT_LOAD_NO_BITMAP) ) { FT_GlyphSlot glyph = face->glyph; FT_Bitmap bits; if (glyph->format == ft_glyph_format_outline ) { if (!FT_Render_Glyph( glyph, FT_RENDER_MODE_NORMAL)) { bits = glyph->bitmap; u8 *pt = bits.buffer; delete[] image; image = new u8[bits.width * bits.rows]; memcpy(image,pt,bits.width * bits.rows); top = glyph->bitmap_top; left = glyph->bitmap_left; imgw = 1; imgh = 1; texw = bits.width; texh = bits.rows; for(;;) { if (imgw > texw) { break; } else { imgw <<= 1; } } for(;;) { if (imgh > texh) { break; } else { imgh <<= 1; } } if (imgw > imgh) { imgh = imgw; } else { imgw = imgh; } s32 offx = left; s32 offy = size - top; if ( offx+texw > freetypeFont->LargestGlyph.Width ) freetypeFont->LargestGlyph.Width = offx+texw; if ( offy+texh > freetypeFont->LargestGlyph.Height ) freetypeFont->LargestGlyph.Height = offy+texh; u32 *texd = new u32[imgw*imgh]; memset(texd,0,imgw*imgh*sizeof(u32)); u32 *texp = texd; bool cflag = (freetypeFont->Driver->getDriverType() == video::EDT_DIRECT3D8); for (int i = 0;i < bits.rows;i++) { u32 *rowp = texp; for (int j = 0;j < bits.width;j++) { if (*pt) { if (cflag) { *rowp = *pt; *rowp *= 0x01010101; } else { *rowp = *pt << 24; *rowp |= 0xffffff; } } else { *rowp = 0; } pt++; rowp++; } texp += imgw; } c8 name[128]; sprintf(name,"ttf%d_%d_%p",idx_, size, freetypeFont ); video::IImage *img = freetypeFont->Driver->createImageFromData(video::ECF_A8R8G8B8,core::dimension2d<u32>(imgw,imgh),texd); setGlyphTextureFlags(freetypeFont->Driver); tex = freetypeFont->Driver->addTexture(name,img); img->drop(); restoreTextureFlags(freetypeFont->Driver); delete[] texd; cached = true; } } } if (!FT_Load_Glyph(face,idx_,FT_LOAD_NO_HINTING|FT_LOAD_RENDER|FT_LOAD_MONOCHROME)) { FT_GlyphSlot glyph = face->glyph; FT_Bitmap bits = glyph->bitmap; u8 *pt = bits.buffer; top16 = glyph->bitmap_top; left16 = glyph->bitmap_left; imgw16 = 1; imgh16 = 1; texw16 = bits.width; texh16 = bits.rows; for(;;) { if (imgw16 >= texw16) { break; } else { imgw16 <<= 1; } } for(;;) { if (imgh16 >= texh16) { break; } else { imgh16 <<= 1; } } if (imgw16 > imgh16) { imgh16 = imgw16; } else { imgw16 = imgh16; } s32 offx = left; s32 offy = size - top; if ( offx+texw > freetypeFont->LargestGlyph.Width ) freetypeFont->LargestGlyph.Width = offx+texw; if ( offy+texh > freetypeFont->LargestGlyph.Height ) freetypeFont->LargestGlyph.Height = offy+texh; u16 *texd16 = new u16[imgw16*imgh16]; memset(texd16,0,imgw16*imgh16*sizeof(u16)); u16 *texp16 = texd16; for (int y = 0;y < bits.rows;y++) { u16 *rowp = texp16; for (int x = 0;x < bits.width;x++) { if (pt[y * bits.pitch + (x / 8)] & (0x80 >> (x % 8))) { *rowp = 0xffff; } rowp++; } texp16 += imgw16; } c8 name[128]; sprintf(name,"ttf%d_%d_%p_16",idx_, size, freetypeFont ); video::IImage *img = freetypeFont->Driver->createImageFromData(video::ECF_A1R5G5B5,core::dimension2d<u32>(imgw16,imgh16),texd16); setGlyphTextureFlags(freetypeFont->Driver); tex16 = freetypeFont->Driver->addTexture(name,img); img->drop(); restoreTextureFlags(freetypeFont->Driver); // freetypeFont->Driver->makeColorKeyTexture(tex16,video::SColor(0,0,0,0)); delete[] texd16; } } bool CGUITTGlyph::mTexFlag16 = false; bool CGUITTGlyph::mTexFlag32 = true; bool CGUITTGlyph::mTexFlagMip = false; void CGUITTGlyph::setGlyphTextureFlags(video::IVideoDriver* driver_) { mTexFlag16 = driver_->getTextureCreationFlag(video::ETCF_ALWAYS_16_BIT); mTexFlag32 = driver_->getTextureCreationFlag(video::ETCF_ALWAYS_32_BIT); mTexFlagMip = driver_->getTextureCreationFlag(video::ETCF_CREATE_MIP_MAPS); driver_->setTextureCreationFlag(video::ETCF_ALWAYS_16_BIT,false); driver_->setTextureCreationFlag(video::ETCF_ALWAYS_32_BIT,true); driver_->setTextureCreationFlag(video::ETCF_CREATE_MIP_MAPS, false); } void CGUITTGlyph::restoreTextureFlags(video::IVideoDriver* driver_) { driver_->setTextureCreationFlag(video::ETCF_ALWAYS_16_BIT, mTexFlag16); driver_->setTextureCreationFlag(video::ETCF_ALWAYS_32_BIT, mTexFlag32); driver_->setTextureCreationFlag(video::ETCF_CREATE_MIP_MAPS, mTexFlagMip); } // -------------------------------------------------------- FT_Library CGUITTFace::library = 0; int CGUITTFace::countClassObjects = 0; CGUITTFace::CGUITTFace() : face(0) { ++countClassObjects; } CGUITTFace::~CGUITTFace() { if ( face ) FT_Done_Face( face ); --countClassObjects; assert(countClassObjects >= 0 ); if ( !countClassObjects && library ) { FT_Done_FreeType( library ); library = 0; } } //! loads a font file bool CGUITTFace::load(const irr::io::path& filename) { if ( !library ) { if (FT_Init_FreeType( &library )) { return false; } } core::stringc ansiFilename(filename); // path can be anything but freetype can only work with ansi-filenames if (FT_New_Face( library,ansiFilename.c_str(),0,&face )) { return false; } return true; } // -------------------------------------------------------- //! constructor CGUIFreetypeFont::CGUIFreetypeFont(video::IVideoDriver* driver) : Driver(driver) , TrueTypeFace(0) { #ifdef _DEBUG setDebugName("CGUIFreetypeFont"); #endif if (Driver) Driver->grab(); AntiAlias = false; Transparency = false; } //! destructor CGUIFreetypeFont::~CGUIFreetypeFont() { if ( TrueTypeFace ) TrueTypeFace->drop(); if (Driver) Driver->drop(); clearGlyphs(); } bool CGUIFreetypeFont::attach(CGUITTFace *Face,u32 size) { if (!Driver || !Face) return false; Face->grab(); if ( TrueTypeFace ) TrueTypeFace->drop(); TrueTypeFace = Face; if ( !TrueTypeFace ) return false; clearGlyphs(); Glyphs.reallocate(TrueTypeFace->face->num_glyphs); Glyphs.set_used(TrueTypeFace->face->num_glyphs); for (int i = 0;i < TrueTypeFace->face->num_glyphs;i++) { CGUITTGlyph * glyph = new CGUITTGlyph(); glyph->size = size; // glyph->cache((wchar_t)i + 1); Glyphs[i] = glyph; } // TODO: this is a workaround to get a probably ok height for getDimensions. So we check a few extreme characters which usually make trouble. getGlyphByChar(L'A'); getGlyphByChar(L'g'); getGlyphByChar(L'.'); getGlyphByChar(L'('); return true; } void CGUIFreetypeFont::clearGlyphs() { for ( unsigned int i=0; i < Glyphs.size(); ++i ) { if ( Glyphs[i] ) { Glyphs[i]->drop(); } Glyphs[i] = 0; } } u32 CGUIFreetypeFont::getGlyphByChar(wchar_t c) const { u32 idx = FT_Get_Char_Index( TrueTypeFace->face, c ); if ( idx && !Glyphs[idx - 1]->cached ) Glyphs[idx - 1]->cache(idx, this); return idx; } //! returns the dimension of a text core::dimension2d<u32> CGUIFreetypeFont::getDimension(const wchar_t* text) const { core::dimension2d<u32> dim(0, Glyphs[0]->size); for(const wchar_t* p = text; *p; ++p) { dim.Width += getWidthFromCharacter(*p); } // TODO: The correct solution might be working with TrueTypeFace->height but I can't figure out how to use units_per_EM // even if I know which FT_Render_Mode I used. I'm sure there is some way to figure that out, but I have to give up for now. if ( TrueTypeFace && LargestGlyph.Height > dim.Height) dim.Height = LargestGlyph.Height; return dim; } inline u32 CGUIFreetypeFont::getWidthFromCharacter(wchar_t c) const { u32 n = getGlyphByChar(c); if ( n > 0) { int w = Glyphs[n - 1]->texw; s32 left = Glyphs[n - 1]->left; if (w + left > 0) return w + left; } if (c >= 0x2000) { return Glyphs[0]->size; } else { return Glyphs[0]->size / 2; } } //! draws an text and clips it to the specified rectangle if wanted void CGUIFreetypeFont::draw(const irr::core::stringw& textstring, const irr::core::rect<s32>& position, video::SColor color, bool hcenter, bool vcenter, const core::rect<s32>* clip) { if (!Driver) return; core::dimension2d<s32> textDimension; core::position2d<s32> offset = position.UpperLeftCorner; video::SColor colors[4]; for (int i = 0;i < 4;i++) { colors[i] = color; } const wchar_t * text = textstring.c_str(); if (hcenter || vcenter) { textDimension = getDimension(text); if (hcenter) offset.X = ((position.getWidth() - textDimension.Width)>>1) + offset.X; if (vcenter) offset.Y = ((position.getHeight() - textDimension.Height)>>1) + offset.Y; } u32 n; while(*text) { n = getGlyphByChar(*text); if ( n > 0) { if (AntiAlias) { // s32 imgw = Glyphs[n-1]->imgw; // s32 imgh = Glyphs[n-1]->imgh; s32 texw = Glyphs[n-1]->texw; s32 texh = Glyphs[n-1]->texh; s32 offx = Glyphs[n-1]->left; s32 offy = Glyphs[n-1]->size - Glyphs[n-1]->top; if (Driver->getDriverType() != video::EDT_SOFTWARE) { if (!Transparency) color.color |= 0xff000000; Driver->draw2DImage(Glyphs[n-1]->tex,core::position2d<s32>(offset.X+offx,offset.Y+offy),core::rect<s32>(0,0,texw,texh),clip,color,true); } else { s32 a = color.getAlpha(); s32 r = color.getRed(); s32 g = color.getGreen(); s32 b = color.getBlue(); u8 *pt = Glyphs[n-1]->image; if (!Transparency) a = 255; for (int y = 0;y < texh;y++) { for (int x = 0;x < texw;x++) { if (!clip || clip->isPointInside(core::position2d<s32>(offset.X+x+offx,offset.Y+y+offy))) { if (*pt) { Driver->draw2DRectangle(video::SColor((a * *pt)/255,r,g,b),core::rect<s32>(offset.X+x+offx,offset.Y+y+offy,offset.X+x+offx+1,offset.Y+y+offy+1)); } pt++; } } } } } else { // s32 imgw = Glyphs[n-1]->imgw16; // s32 imgh = Glyphs[n-1]->imgh16; s32 texw = Glyphs[n-1]->texw16; s32 texh = Glyphs[n-1]->texh16; s32 offx = Glyphs[n-1]->left16; s32 offy = Glyphs[n-1]->size - Glyphs[n-1]->top16; if (!Transparency) { color.color |= 0xff000000; } Driver->draw2DImage(Glyphs[n-1]->tex16, core::position2d<s32>(offset.X+offx,offset.Y+offy), core::rect<s32>(0,0,texw,texh), clip, color, true); } offset.X += getWidthFromCharacter(*text); } else { offset.X += getWidthFromCharacter(*text); } ++text; } } //! Calculates the index of the character in the text which is on a specific position. s32 CGUIFreetypeFont::getCharacterFromPos(const wchar_t* text, s32 pixel_x) const { s32 x = 0; s32 idx = 0; while (text[idx]) { x += getWidthFromCharacter(text[idx]); if (x >= pixel_x) return idx; ++idx; } return -1; } #endif // #if COMPILE_WITH_FREETYPE

 

参考网站

[1]Irrlicht ML 1.5

This is a multilingual version of Irrlicht 3D engine（最高只支持Irrlicht 1.5版本）

http://etwas.wolfish.org/Irrlicht/irrlichtml_en.html