974831e7f8
git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk@27 7f0cb862-5218-0410-a997-914c9d46530a
338 lines
8.8 KiB
C
338 lines
8.8 KiB
C
/*
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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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#define G_LOG_DOMAIN "freeglut-font"
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#include "../include/GL/freeglut.h"
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#include "../include/GL/freeglut_internal.h"
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/*
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* TODO BEFORE THE STABLE RELEASE:
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*
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* glutStrokeCharacter() -- stroke fonts not implemented, uses a bitmap font instead
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* glutStrokeWidth() -- stroke fonts not implemented, uses a bitmap font instead
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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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/*
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* This is for GLUT binary compatibility, as suggested by Steve Baker
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*/
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#if TARGET_HOST_UNIX_X11
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void* glutStrokeRoman;
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void* glutStrokeMonoRoman;
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void* glutBitmap9By15;
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void* glutBitmap8By13;
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void* glutBitmapTimesRoman10;
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void* glutBitmapTimesRoman24;
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void* glutBitmapHelvetica10;
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void* glutBitmapHelvetica12;
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void* glutBitmapHelvetica18;
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#endif
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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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/*
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* Try matching the font ID and the font data structure
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*/
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if( font == GLUT_BITMAP_8_BY_13 ) return( &fgFontFixed8x13 );
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if( font == GLUT_BITMAP_9_BY_15 ) return( &fgFontFixed9x15 );
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if( font == GLUT_BITMAP_HELVETICA_10 ) return( &fgFontHelvetica10 );
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if( font == GLUT_BITMAP_HELVETICA_12 ) return( &fgFontHelvetica12 );
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if( font == GLUT_BITMAP_HELVETICA_18 ) return( &fgFontHelvetica18 );
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if( font == GLUT_BITMAP_TIMES_ROMAN_10 ) return( &fgFontTimesRoman10 );
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if( font == GLUT_BITMAP_TIMES_ROMAN_24 ) return( &fgFontTimesRoman24 );
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/*
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* This probably is the library user's fault
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*/
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fgError( "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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/*
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* Try matching the font ID and the font data structure
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*/
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if( font == GLUT_STROKE_ROMAN ) return( &fgStrokeRoman );
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if( font == GLUT_STROKE_MONO_ROMAN ) return( &fgStrokeMonoRoman );
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/*
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* This probably is the library user's fault
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*/
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fgError( "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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/*
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* First of all we'll need a font to use
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*/
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SFG_Font* font = fghFontByID( fontID );
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/*
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* Make sure the character we want to output is valid
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*/
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freeglut_return_if_fail( character >= 0 && character < 256 );
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/*
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* Then find the character we want to draw
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*/
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face = font->Characters[ character - 1 ];
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/*
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* Save the old pixel store settings
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*/
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glPushClientAttrib( GL_CLIENT_PIXEL_STORE_BIT );
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/*
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* Set up the pixel unpacking ways
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*/
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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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* We'll use a glBitmap call to draw the font.
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*/
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glBitmap(
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face[ 0 ], font->Height, /* The bitmap's width and height */
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0, 0, /* The origin -- what the hell? */
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face[ 0 ] + 1, 0, /* The raster advance -- inc. x */
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(face + 1) /* The packed bitmap data... */
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);
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/*
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* Restore the old pixel store settings
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*/
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glPopClientAttrib();
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}
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void FGAPIENTRY glutBitmapString( void* fontID, const char *string )
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{
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int i;
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for( i=0; i<strlen( string ); i++ )
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glutBitmapCharacter( fontID, string[ i ] );
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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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/*
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* First of all, grab the font we need
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*/
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SFG_Font* font = fghFontByID( fontID );
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/*
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* Make sure the character we want to output is valid
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*/
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freeglut_return_val_if_fail( character > 0 && character < 256, 0 );
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/*
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* Scan the font looking for the specified character
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*/
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return( *(font->Characters[ character - 1 ]) + 1 );
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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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/*
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* First of all we'll need a font to use
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*/
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SFG_StrokeFont* font = fghStrokeByID( fontID );
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/*
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* Make sure the character we want to output is valid
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*/
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freeglut_return_if_fail( character >= 0 && character < font->Quantity );
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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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{
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glVertex2f(strip->Vertices[j].X, strip->Vertices[j].Y);
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}
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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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/*
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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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/*
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* First of all we'll need a font to use
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*/
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SFG_StrokeFont* font = fghStrokeByID( fontID );
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/*
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* Make sure the character we want to output is valid
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*/
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freeglut_return_if_fail( character >= 0 && character < font->Quantity );
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schar = font->Characters[character];
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freeglut_return_if_fail( schar );
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return (schar->Right);
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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 char* string )
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{
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int i, length = 0;
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/*
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* Using glutBitmapWidth() function to calculate the result
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*/
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for( i=0; i<strlen( string ); i++ )
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length += glutBitmapWidth( fontID, string[ i ] );
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/*
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* Return the result now
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*/
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return( length );
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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 char* string )
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{
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int i, length = 0;
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/*
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* Using glutStrokeWidth() function to calculate the result
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*/
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for( i=0; i<strlen( string ); i++ )
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length += glutStrokeWidth( fontID, string[ i ] );
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/*
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* Return the result now
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*/
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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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/*
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* See which font are we queried about
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*/
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SFG_Font* font = fghFontByID( fontID );
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/*
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* Return the character set's height
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*/
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return( font->Height );
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}
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/*
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* Returns the height of a stroke font
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*/
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GLfloat FGAPIENTRY glutStrokeHeight( void* fontID )
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{
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/*
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* See which font are we queried about
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*/
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SFG_StrokeFont* font = fghStrokeByID( fontID );
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/*
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* Return the character set's height
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*/
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return( font->Height );
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}
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/*** END OF FILE ***/
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