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label.c
138 lines (125 loc) · 3.43 KB
/
label.c
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#include "label.h"
static FT_Library library;
static int texture;
EXPORT_API void RNG_LabelInit()
{
FT_Init_FreeType( &library );
glGenTextures(1,&texture);
glBindTexture(GL_TEXTURE_2D,texture);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
}
EXPORT_API RNG_Label * RNG_LabelNew(const char *file_name)
{
RNG_Label * label =malloc(sizeof(RNG_Label ));
FT_New_Face( library,file_name ,0,&(label->face) );
FT_Set_Pixel_Sizes((label->face),0,128 );
label->file_name=file_name;
label->str=NULL;
label->width=32;
label->offset.x=0;
label->offset.y=0;
label->height=32;
label->color=RNG_Col4(1,1,1,1);
return label;
}
EXPORT_API void RNG_LabelSetText(RNG_Label * ptr,wchar_t * str)
{
ptr->str=str;
}
static void text_draw(FT_Face face,wchar_t * str,RNG_Int width ,RNG_Int height,RNG_Color color,RNG_Vector offset)
{
static GLdouble quad[4][2];
static GLubyte expanded_data [128*128*4];
static GLfloat textureCoordinates[4][2];
glTranslated(offset.x,offset.y,0);
for(int k=0; str[k]!='\0'; k++)
{
//对空格进行特殊处理
if(str[k]==32)
{
for(int i =0; i<128*128*4; i++)
{
expanded_data[i]=0;
}
}
else
{
FT_Load_Glyph( face, FT_Get_Char_Index( face, str[k]), FT_LOAD_DEFAULT );
FT_Render_Glyph( face->glyph, FT_RENDER_MODE_NORMAL );
for(int j=0; j <face->glyph->bitmap.rows; j++)
{
for(int i=0; i < face->glyph->bitmap.width; i++)
{
if(face->glyph->bitmap.buffer[i + face->glyph->bitmap.width*j])
{
expanded_data[4*(i+j*face->glyph->bitmap.width)] = 255;
expanded_data[4*(i+j*face->glyph->bitmap.width)+1]=255;
expanded_data[4*(i+j*face->glyph->bitmap.width)+2]=255;
expanded_data[4*(i+j*face->glyph->bitmap.width)+3]=255;
}
else
{
expanded_data[4*(i+j*face->glyph->bitmap.width)] = 0;
expanded_data[4*(i+j*face->glyph->bitmap.width)+1]=0;
expanded_data[4*(i+j*face->glyph->bitmap.width)+2]=0;
expanded_data[4*(i+j*face->glyph->bitmap.width)+3]=0;
}
}
}
}
//左下
quad[0][0]=0;
quad[0][1]=0;
//右下
quad[1][0]=width;
quad[1][1]=0;
//左上
quad[2][0]=0;
quad[2][1]=height;
//右上
quad[3][0]=width;
quad[3][1]=height;
//左下
textureCoordinates[0][0]=0;
textureCoordinates[0][1]=1;
//右下
textureCoordinates[1][0]=1;
textureCoordinates[1][1]=1;
//左上
textureCoordinates[2][0]=0;
textureCoordinates[2][1]=0;
//右上
glColor4d(color.red,color.green,color.blue,color.alpha);
textureCoordinates[3][0]=1;
textureCoordinates[3][1]=0;
glBindTexture(GL_TEXTURE_2D,texture);
glTexImage2D(GL_TEXTURE_2D,0,GL_RGBA,face->glyph->bitmap.width,face->glyph->bitmap.rows,0,GL_RGBA,GL_UNSIGNED_BYTE,expanded_data);
glTranslatef(width,0,0);
glTexCoordPointer(2, GL_FLOAT, 0, textureCoordinates);
glVertexPointer(2,GL_DOUBLE,0,quad);
glDrawArrays(GL_TRIANGLE_STRIP,0,4);
}
}
EXPORT_API void RNG_LabelDraw(RNG_Label * ptr)
{
text_draw(ptr->face,ptr->str,ptr->width,ptr->height,ptr->color,ptr->offset);
}
EXPORT_API void RNG_LabelDispose(RNG_Label *ptr)
{
FT_Done_Face( ptr-> face );
free(ptr);
}
EXPORT_API void RNG_LabelSetSize(RNG_Label * ptr,RNG_Int width,RNG_Int height)
{
ptr->width=width;
ptr->height=height;
}
EXPORT_API void RNG_LabelSetColor(RNG_Label *ptr,RNG_Color color)
{
ptr->color=color;
}
EXPORT_API void RNG_LabelSetOffset(RNG_Label *ptr,RNG_Vector offset)
{
ptr->offset=offset;
}