freetype2结合bitmap中文显示
1. 注意pitch，是显示客户区域的长度，并安4bit对齐
2。单个字向客户显示区域bitblt
3. bitmap.buffer由1byte转换成rgb,0时则跳过
4。由于freetype形成的字体轮廓问题，有的字体当大小不适合时显示中文出现异常
//***********************************************************/
#include "stdafx.h"
#include "freetype.h"
#include "commdlg.h"
#include
#include "gl\glu.h"
#include "glut.h"
#include
#include
#include
#include
#include
#pragma comment(lib , "lib/freetype2110.lib")
//#pragma comment(lib , "lib/glut32.lib")
#define MAX_LOADSTRING 100
// Global Variables:
HINSTANCE hInst; // current instance
TCHAR szTitle[MAX_LOADSTRING]; // The title bar text
TCHAR szWindowClass[MAX_LOADSTRING]; // the main window class name
int g_nRowsize=0; //pixes per row
// Forward declarations of functions included in this code module:
ATOM MyRegisterClass(HINSTANCE hInstance);
BOOL InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK About(HWND, UINT, WPARAM, LPARAM);
void drawText(HDC hdc, wchar_t* _strText,int x , int y, int maxW , int h);
LPWSTR AnsiToUnicode(LPCSTR lpcstr) ;
HBITMAP createDIBitmapCommon(wchar_t ch, HDC hdc);
/*****************************************************************/
struct xCharTexture
{
GLuint m_texID;
wchar_t m_chaID;
int m_Width;
int m_Height;
int m_adv_x;
int m_adv_y;
int m_delta_x;
int m_delta_y;
GLubyte* m_pbuf;
public:
xCharTexture()
{
m_texID = 0;
m_chaID = 0;
m_Width = 0;
m_Height = 0;
}
}g_TexID[65536];
class xFreeTypeLib
{
FT_Library m_FT2Lib;
FT_Face m_FT_Face;
public:
int m_w;
int m_h;
void load(const char* font_file , int _w , int _h);
GLuint loadChar(wchar_t ch);
GLuint Paint(HDC hdc, wchar_t ch);
BOOL xFreeTypeLib::fontPaint(HDC hdc);
};
xFreeTypeLib g_FreeTypeLib;
xCharTexture* getTextChar(wchar_t ch);
wchar_t g_UnicodeString[]=L"AAbb\x4E2D\x6587\x0031\x0032\x0033";
const char g_AnsiString[]=
"aaa VB文件格式：\n\
若不明确就标为未知\n\
表演者： 若不明确就标为未知\n\
专辑： 若不明确就标为未知\n\
持续时间：01:01:00超过1小时；\n\
09:09不足小时；00:09不足1分钟\n\
glBindTexture(GL_TEXTURE_2D,pCharTex->m_texID);\n\
glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );\n\
glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );\n\
glEnable(GL_BLEND);\n\
glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA)" ;
/******************************************************/
int APIENTRY _tWinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPTSTR lpCmdLine,
int nCmdShow)
{
// TODO: Place code here.
MSG msg;
HACCEL hAccelTable;
// Initialize global strings
LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
LoadString(hInstance, IDC_FREETYPE, szWindowClass, MAX_LOADSTRING);
MyRegisterClass(hInstance);
g_FreeTypeLib.load("c:\\windows\\fonts\\simhei.ttf",0,24);
//g_FreeTypeLib.load("c:\\windows\\fonts\\simsun.ttc",0,18);
// Perform application initialization:
if (!InitInstance (hInstance, nCmdShow))
{
return FALSE;
}
hAccelTable = LoadAccelerators(hInstance, (LPCTSTR)IDC_FREETYPE);
// Main message loop:
while (GetMessage(&msg, NULL, 0, 0))
{
if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
return (int) msg.wParam;
}
//
// FUNCTION: MyRegisterClass()
//
// PURPOSE: Registers the window class.
//
// COMMENTS:
//
// This function and its usage are only necessary if you want this code
// to be compatible with Win32 systems prior to the 'RegisterClassEx'
// function that was added to Windows 95. It is important to call this function
// so that the application will get 'well formed' small icons associated
// with it.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
WNDCLASSEX wcex;
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = (WNDPROC)WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = LoadIcon(hInstance, (LPCTSTR)IDI_FREETYPE);
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName = (LPCTSTR)IDC_FREETYPE;
wcex.lpszClassName = szWindowClass;
wcex.hIconSm = LoadIcon(wcex.hInstance, (LPCTSTR)IDI_SMALL);
return RegisterClassEx(&wcex);
}
//
// FUNCTION: InitInstance(HANDLE, int)
//
// PURPOSE: Saves instance handle and creates main window
//
// COMMENTS:
//
// In this function, we save the instance handle in a global variable and
// create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
HWND hWnd;
hInst = hInstance; // Store instance handle in our global variable
hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, 0, 300, 240, NULL, NULL, hInstance, NULL);
if (!hWnd)
{
return FALSE;
}
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
return TRUE;
}
//
// FUNCTION: WndProc(HWND, unsigned, WORD, LONG)
//
// PURPOSE: Processes messages for the main window.
//
// WM_COMMAND - process the application menu
// WM_PAINT - Paint the main window
// WM_DESTROY - post a quit message and return
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
int wmId, wmEvent;
PAINTSTRUCT ps;
HDC hdc;
switch (message)
{
case WM_COMMAND:
wmId = LOWORD(wParam);
wmEvent = HIWORD(wParam);
// Parse the menu selections:
switch (wmId)
{
case IDM_ABOUT:
DialogBox(hInst, (LPCTSTR)IDD_ABOUTBOX, hWnd, (DLGPROC)About);
break;
case IDM_EXIT:
DestroyWindow(hWnd);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
break;
case WM_PAINT:
hdc = BeginPaint(hWnd, &ps);
// TODO: Add any drawing code here...
wchar_t *wstr;
//wstr = AnsiToUnicode(g_AnsiString);
wstr = g_UnicodeString;
if (g_nRowsize==0)
{
int nRowPad = 4;
RECT r;
GetClientRect(hWnd, &r);
g_nRowsize = r.right-r.left;
g_nRowsize += nRowPad - 1;
g_nRowsize -= g_nRowsize % nRowPad;
}
drawText(hdc, wstr, 50, 50, 300,25);
EndPaint(hWnd, &ps);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}
// Message handler for about box.
LRESULT CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_INITDIALOG:
return TRUE;
case WM_COMMAND:
if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
{
EndDialog(hDlg, LOWORD(wParam));
return TRUE;
}
break;
}
return FALSE;
}
/******************************************/
void xFreeTypeLib::load(const char* font_file , int _w , int _h)
{
FT_Library library;
if (FT_Init_FreeType( &library) )
exit(0);
//加载一个字体,取默认的Face,一般为Regualer
if (FT_New_Face( library, font_file, 0, &m_FT_Face ))
exit(0);
FT_Select_Charmap(m_FT_Face, FT_ENCODING_UNICODE);
m_w = _w ; m_h = _h;
m_FT_Face->num_fixed_sizes;
//大小要乘64.这是规定。照做就可以了。
//FT_Set_Char_Size( m_FT_Face , 64 << 1 , 64 << 1 , 1200 , 1200 );
FT_Set_Pixel_Sizes(m_FT_Face,m_w, m_h);
}
GLuint xFreeTypeLib::loadChar(wchar_t ch)
{
if(g_TexID[ch].m_texID)
return g_TexID[ch].m_texID;
if(FT_Load_Char(m_FT_Face, ch, /*FT_LOAD_RENDER|*/FT_LOAD_FORCE_AUTOHINT|
(TRUE ? FT_LOAD_TARGET_NORMAL : FT_LOAD_MONOCHROME | FT_LOAD_TARGET_MONO) ) )
{
return 0;
}
/*if(FT_Load_Glyph( m_FT_Face, FT_Get_Char_Index( m_FT_Face, ch ), FT_LOAD_RENDER|FT_LOAD_FORCE_AUTOHINT|
(TRUE ? FT_LOAD_TARGET_NORMAL : FT_LOAD_MONOCHROME | FT_LOAD_TARGET_MONO) ))
throw std::runtime_error("FT_Load_Glyph failed");*/
xCharTexture& charTex = g_TexID[ch];
//得到字模
FT_Glyph glyph;
if(FT_Get_Glyph( m_FT_Face->glyph, &glyph ))
return 0;
//转化成位图
BOOL aa=FALSE;
FT_Render_Glyph( m_FT_Face->glyph, aa ? ft_render_mode_normal : ft_render_mode_mono );//FT_RENDER_MODE_NORMAL );
FT_Glyph_To_Bitmap( &glyph, ft_render_mode_normal, 0, 1 );
FT_BitmapGlyph bitmap_glyph = (FT_BitmapGlyph)glyph;
//取道位图数据
FT_Bitmap& bitmap=bitmap_glyph->bitmap;
bitmap.pixel_mode =FT_PIXEL_MODE_MONO;
glGenTextures(1,&charTex.m_texID);
//把位图数据拷贝自己定义的数据区里.这样旧可以画到需要的东西上面了。
int width = bitmap.width;
int height = bitmap.rows;
m_FT_Face->size->metrics.y_ppem;
m_FT_Face->glyph->metrics.horiAdvance;
charTex.m_Width = width;
charTex.m_Height = height;
charTex.m_adv_x = m_FT_Face->glyph->advance.x / 64.0f;
charTex.m_adv_y = m_FT_Face->size->metrics.y_ppem; //m_FT_Face->glyph->metrics.horiBearingY / 64.0f;
charTex.m_delta_x = (float)bitmap_glyph->left;
charTex.m_delta_y = (float)bitmap_glyph->top - height;
int nPitch = g_nRowsize * 3;
charTex.m_pbuf = new GLubyte[nPitch * height];
memset(charTex.m_pbuf, 0, nPitch * height);
GLubyte *pbuf = new GLubyte[ width * height];
GLubyte *p;
for(int j=0; j < height ; j++)
{
for(int i=0; i < width; i++)
{
int n = *bitmap.buffer++;
if (n>0)
{
int nPos = j*nPitch + 3*i;
charTex.m_pbuf[ nPos ] = 0x00;
charTex.m_pbuf[nPos+1] = 0x00;
charTex.m_pbuf[nPos+2] = 0xFF;
}
}
}
return charTex.m_chaID;
}
/*****************************************************************/
void drawText(HDC hdc, wchar_t* _strText,int x , int y, int maxW , int h)
{
int sx = x;
int sy = y;
int maxH = h;
size_t nLen = wcslen(_strText);
for(int i = 0 ; i {
if(_strText[i] =='\n')
{
sx = x ;
sy += maxH * 1.2;
continue;
}
xCharTexture* pCharTex = getTextChar(_strText[i]);
int w = pCharTex->m_Width;
int h = pCharTex->m_Height;
int ch_x = sx + pCharTex->m_delta_x;
int ch_y = sy - h - pCharTex->m_delta_y+20;
if(maxH < h) maxH = h;
HBITMAP hbmp = createDIBitmapCommon(_strText[i], hdc);
HDC bmpDC = CreateCompatibleDC(hdc);
if (bmpDC) {
SelectObject(bmpDC, hbmp);
if(1==2)
StretchBlt(hdc, sx+1, sx+1, sy-2, sy-2, bmpDC, ch_x, ch_y,ch_x+w, ch_y+h,SRCCOPY);
else
BitBlt(hdc, 20+sx, 20, w, h, bmpDC, 0, 0, SRCCOPY);
DeleteDC(bmpDC);
}
DeleteObject(hbmp);
sx += pCharTex->m_adv_x;
if(sx > x + maxW)
{
sx = x ;
sy += maxH +5 ;
}
//break;
}
}
xCharTexture* getTextChar(wchar_t ch)
{
g_FreeTypeLib.loadChar(ch);
return &g_TexID[ch];
}
LPWSTR AnsiToUnicode(LPCSTR lpcstr) //参数lpcstr类型也可是char*
{
LPWSTR Pwstr;
int i;
i=MultiByteToWideChar(CP_ACP,0,lpcstr,-1,NULL,0);
Pwstr=new WCHAR[i];
MultiByteToWideChar(CP_ACP,0,lpcstr,-1,Pwstr,i);
return (Pwstr);
}
static HBITMAP createDIBitmapCommon(wchar_t ch, HDC hdc)
{
int bmpDx = g_TexID[ch].m_Width;
int bmpDy = g_TexID[ch].m_Height;
int bmpRowSize =bmpDx*bmpDy;
BITMAPINFOHEADER bmih;
bmih.biSize = sizeof(bmih);
bmih.biHeight = -bmpDy;
bmih.biWidth = g_nRowsize;
bmih.biPlanes = 1;
bmih.biBitCount = 24;
bmih.biCompression = BI_RGB;
bmih.biSizeImage = bmpRowSize;
bmih.biXPelsPerMeter = bmih.biYPelsPerMeter = 0;
bmih.biClrUsed = bmih.biClrImportant = 0;
unsigned char* bmpData = g_TexID[ch].m_pbuf;
HBITMAP hbmp = ::CreateDIBitmap(hdc, &bmih, CBM_INIT, bmpData, (BITMAPINFO *)&bmih , DIB_RGB_COLORS);
return hbmp;
}
