freeglut_font.c
上传用户:gb3593
上传日期:2022-01-07
资源大小:3028k
文件大小:12k
- /*
- * freeglut_font.c
- *
- * Bitmap and stroke fonts displaying.
- *
- * Copyright (c) 1999-2000 Pawel W. Olszta. All Rights Reserved.
- * Written by Pawel W. Olszta, <olszta@sourceforge.net>
- * Creation date: Thu Dec 16 1999
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included
- * in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * PAWEL W. OLSZTA BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
- * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
- #include <GL/freeglut.h>
- #include "freeglut_internal.h"
- /*
- * TODO BEFORE THE STABLE RELEASE:
- *
- * Test things out ...
- */
- /* -- IMPORT DECLARATIONS -------------------------------------------------- */
- /*
- * These are the font faces defined in freeglut_font_data.c file:
- */
- extern SFG_Font fgFontFixed8x13;
- extern SFG_Font fgFontFixed9x15;
- extern SFG_Font fgFontHelvetica10;
- extern SFG_Font fgFontHelvetica12;
- extern SFG_Font fgFontHelvetica18;
- extern SFG_Font fgFontTimesRoman10;
- extern SFG_Font fgFontTimesRoman24;
- extern SFG_StrokeFont fgStrokeRoman;
- extern SFG_StrokeFont fgStrokeMonoRoman;
- /* -- PRIVATE FUNCTIONS ---------------------------------------------------- */
- /*
- * Matches a font ID with a SFG_Font structure pointer.
- * This was changed to match the GLUT header style.
- */
- static SFG_Font* fghFontByID( void* font )
- {
- if( font == GLUT_BITMAP_8_BY_13 )
- return &fgFontFixed8x13;
- if( font == GLUT_BITMAP_9_BY_15 )
- return &fgFontFixed9x15;
- if( font == GLUT_BITMAP_HELVETICA_10 )
- return &fgFontHelvetica10;
- if( font == GLUT_BITMAP_HELVETICA_12 )
- return &fgFontHelvetica12;
- if( font == GLUT_BITMAP_HELVETICA_18 )
- return &fgFontHelvetica18;
- if( font == GLUT_BITMAP_TIMES_ROMAN_10 )
- return &fgFontTimesRoman10;
- if( font == GLUT_BITMAP_TIMES_ROMAN_24 )
- return &fgFontTimesRoman24;
- fgWarning( "font 0x%08x not found", font );
- return 0;
- }
- /*
- * Matches a font ID with a SFG_StrokeFont structure pointer.
- * This was changed to match the GLUT header style.
- */
- static SFG_StrokeFont* fghStrokeByID( void* font )
- {
- if( font == GLUT_STROKE_ROMAN )
- return &fgStrokeRoman;
- if( font == GLUT_STROKE_MONO_ROMAN )
- return &fgStrokeMonoRoman;
- fgWarning( "stroke font 0x%08x not found", font );
- return 0;
- }
- /* -- INTERFACE FUNCTIONS -------------------------------------------------- */
- /*
- * Draw a bitmap character
- */
- void FGAPIENTRY glutBitmapCharacter( void* fontID, int character )
- {
- const GLubyte* face;
- SFG_Font* font;
- FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutBitmapCharacter" );
- font = fghFontByID( fontID );
- freeglut_return_if_fail( ( character >= 1 )&&( character < 256 ) );
- freeglut_return_if_fail( font );
- /*
- * Find the character we want to draw (???)
- */
- face = font->Characters[ character ];
- glPushClientAttrib( GL_CLIENT_PIXEL_STORE_BIT );
- glPixelStorei( GL_UNPACK_SWAP_BYTES, GL_FALSE );
- glPixelStorei( GL_UNPACK_LSB_FIRST, GL_FALSE );
- glPixelStorei( GL_UNPACK_ROW_LENGTH, 0 );
- glPixelStorei( GL_UNPACK_SKIP_ROWS, 0 );
- glPixelStorei( GL_UNPACK_SKIP_PIXELS, 0 );
- glPixelStorei( GL_UNPACK_ALIGNMENT, 1 );
- glBitmap(
- face[ 0 ], font->Height, /* The bitmap's width and height */
- font->xorig, font->yorig, /* The origin in the font glyph */
- ( float )( face[ 0 ] ), 0.0, /* The raster advance -- inc. x,y */
- ( face + 1 ) /* The packed bitmap data... */
- );
- glPopClientAttrib( );
- }
- void FGAPIENTRY glutBitmapString( void* fontID, const unsigned char *string )
- {
- unsigned char c;
- float x = 0.0f ;
- SFG_Font* font;
- FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutBitmapString" );
- font = fghFontByID( fontID );
- freeglut_return_if_fail( font );
- if ( !string || ! *string )
- return;
- glPushClientAttrib( GL_CLIENT_PIXEL_STORE_BIT );
- glPixelStorei( GL_UNPACK_SWAP_BYTES, GL_FALSE );
- glPixelStorei( GL_UNPACK_LSB_FIRST, GL_FALSE );
- glPixelStorei( GL_UNPACK_ROW_LENGTH, 0 );
- glPixelStorei( GL_UNPACK_SKIP_ROWS, 0 );
- glPixelStorei( GL_UNPACK_SKIP_PIXELS, 0 );
- glPixelStorei( GL_UNPACK_ALIGNMENT, 1 );
- /*
- * Step through the string, drawing each character.
- * A newline will simply translate the next character's insertion
- * point back to the start of the line and down one line.
- */
- while( ( c = *string++) )
- if( c == 'n' )
- {
- glBitmap ( 0, 0, 0, 0, -x, (float) -font->Height, NULL );
- x = 0.0f;
- }
- else /* Not an EOL, draw the bitmap character */
- {
- const GLubyte* face = font->Characters[ c ];
- glBitmap(
- face[ 0 ], font->Height, /* Bitmap's width and height */
- font->xorig, font->yorig, /* The origin in the font glyph */
- ( float )( face[ 0 ] ), 0.0, /* The raster advance; inc. x,y */
- ( face + 1 ) /* The packed bitmap data... */
- );
- x += ( float )( face[ 0 ] );
- }
- glPopClientAttrib( );
- }
- /*
- * Returns the width in pixels of a font's character
- */
- int FGAPIENTRY glutBitmapWidth( void* fontID, int character )
- {
- SFG_Font* font;
- FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutBitmapWidth" );
- font = fghFontByID( fontID );
- freeglut_return_val_if_fail( character > 0 && character < 256, 0 );
- freeglut_return_val_if_fail( font, 0 );
- return *( font->Characters[ character ] );
- }
- /*
- * Return the width of a string drawn using a bitmap font
- */
- int FGAPIENTRY glutBitmapLength( void* fontID, const unsigned char* string )
- {
- unsigned char c;
- int length = 0, this_line_length = 0;
- SFG_Font* font;
- FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutBitmapLength" );
- font = fghFontByID( fontID );
- freeglut_return_val_if_fail( font, 0 );
- if ( !string || ! *string )
- return 0;
- while( ( c = *string++) )
- {
- if( c != 'n' )/* Not an EOL, increment length of line */
- this_line_length += *( font->Characters[ c ]);
- else /* EOL; reset the length of this line */
- {
- if( length < this_line_length )
- length = this_line_length;
- this_line_length = 0;
- }
- }
- if ( length < this_line_length )
- length = this_line_length;
- return length;
- }
- /*
- * Returns the height of a bitmap font
- */
- int FGAPIENTRY glutBitmapHeight( void* fontID )
- {
- SFG_Font* font;
- FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutBitmapHeight" );
- font = fghFontByID( fontID );
- freeglut_return_val_if_fail( font, 0 );
- return font->Height;
- }
- /*
- * Draw a stroke character
- */
- void FGAPIENTRY glutStrokeCharacter( void* fontID, int character )
- {
- const SFG_StrokeChar *schar;
- const SFG_StrokeStrip *strip;
- int i, j;
- SFG_StrokeFont* font;
- FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutStrokeCharacter" );
- font = fghStrokeByID( fontID );
- freeglut_return_if_fail( character >= 0 );
- freeglut_return_if_fail( character < font->Quantity );
- freeglut_return_if_fail( font );
- schar = font->Characters[ character ];
- freeglut_return_if_fail( schar );
- strip = schar->Strips;
- for( i = 0; i < schar->Number; i++, strip++ )
- {
- glBegin( GL_LINE_STRIP );
- for( j = 0; j < strip->Number; j++ )
- glVertex2f( strip->Vertices[ j ].X, strip->Vertices[ j ].Y );
- glEnd( );
- glBegin( GL_POINTS );
- for( j = 0; j < strip->Number; j++ )
- glVertex2f( strip->Vertices[ j ].X, strip->Vertices[ j ].Y );
- glEnd( );
- }
- glTranslatef( schar->Right, 0.0, 0.0 );
- }
- void FGAPIENTRY glutStrokeString( void* fontID, const unsigned char *string )
- {
- unsigned char c;
- int i, j;
- float length = 0.0;
- SFG_StrokeFont* font;
- FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutStrokeString" );
- font = fghStrokeByID( fontID );
- freeglut_return_if_fail( font );
- if ( !string || ! *string )
- return;
- /*
- * Step through the string, drawing each character.
- * A newline will simply translate the next character's insertion
- * point back to the start of the line and down one line.
- */
- while( ( c = *string++) )
- if( c < font->Quantity )
- {
- if( c == 'n' )
- {
- glTranslatef ( -length, -( float )( font->Height ), 0.0 );
- length = 0.0;
- }
- else /* Not an EOL, draw the bitmap character */
- {
- const SFG_StrokeChar *schar = font->Characters[ c ];
- if( schar )
- {
- const SFG_StrokeStrip *strip = schar->Strips;
- for( i = 0; i < schar->Number; i++, strip++ )
- {
- glBegin( GL_LINE_STRIP );
- for( j = 0; j < strip->Number; j++ )
- glVertex2f( strip->Vertices[ j ].X,
- strip->Vertices[ j ].Y);
- glEnd( );
- }
- length += schar->Right;
- glTranslatef( schar->Right, 0.0, 0.0 );
- }
- }
- }
- }
- /*
- * Return the width in pixels of a stroke character
- */
- int FGAPIENTRY glutStrokeWidth( void* fontID, int character )
- {
- const SFG_StrokeChar *schar;
- SFG_StrokeFont* font;
- FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutStrokeWidth" );
- font = fghStrokeByID( fontID );
- freeglut_return_val_if_fail( ( character >= 0 ) &&
- ( character < font->Quantity ),
- 0
- );
- freeglut_return_val_if_fail( font, 0 );
- schar = font->Characters[ character ];
- freeglut_return_val_if_fail( schar, 0 );
- return ( int )( schar->Right + 0.5 );
- }
- /*
- * Return the width of a string drawn using a stroke font
- */
- int FGAPIENTRY glutStrokeLength( void* fontID, const unsigned char* string )
- {
- unsigned char c;
- float length = 0.0;
- float this_line_length = 0.0;
- SFG_StrokeFont* font;
- FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutStrokeLength" );
- font = fghStrokeByID( fontID );
- freeglut_return_val_if_fail( font, 0 );
- if ( !string || ! *string )
- return 0;
- while( ( c = *string++) )
- if( c < font->Quantity )
- {
- if( c == 'n' ) /* EOL; reset the length of this line */
- {
- if( length < this_line_length )
- length = this_line_length;
- this_line_length = 0.0;
- }
- else /* Not an EOL, increment the length of this line */
- {
- const SFG_StrokeChar *schar = font->Characters[ c ];
- if( schar )
- this_line_length += schar->Right;
- }
- }
- if( length < this_line_length )
- length = this_line_length;
- return( int )( length + 0.5 );
- }
- /*
- * Returns the height of a stroke font
- */
- GLfloat FGAPIENTRY glutStrokeHeight( void* fontID )
- {
- SFG_StrokeFont* font;
- FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutStrokeHeight" );
- font = fghStrokeByID( fontID );
- freeglut_return_val_if_fail( font, 0.0 );
- return font->Height;
- }
- /*** END OF FILE ***/