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