image_get_width.c

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/*****************************************************************************
 * ugBASIC - an isomorphic BASIC language compiler for retrocomputers        *
 *****************************************************************************
 * Copyright 2021-2026 Marco Spedaletti (asimov@mclink.it)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *----------------------------------------------------------------------------
 * Concesso in licenza secondo i termini della Licenza Apache, versione 2.0
 * (la "Licenza"); è proibito usare questo file se non in conformità alla
 * Licenza. Una copia della Licenza è disponibile all'indirizzo:
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Se non richiesto dalla legislazione vigente o concordato per iscritto,
 * il software distribuito nei termini della Licenza è distribuito
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 ****************************************************************************/
 
/****************************************************************************
 * INCLUDE SECTION 
 ****************************************************************************/
 
#include "../../ugbc.h"
 
/****************************************************************************
 * CODE SECTION 
 ****************************************************************************/

Variable * image_get_width( Environment * _environment, char * _image ) {
 
    Variable * image = variable_retrieve( _environment, _image );
    Variable * result = variable_temporary( _environment, VT_WORD, "(image width)" );
 
    outline1("LDA #<%s", image->realName );
    outline0("STA TMPPTR" );
    outline1("LDA #>%s", image->realName );
    outline0("STA TMPPTR+1" );
    switch( image->type ) {
        case VT_IMAGE:
            outline0("LDY #0" );
            break;
        case VT_IMAGES:
        case VT_SEQUENCE:
            outline0("LDY #3" );
            break;
        default:
            CRITICAL_NOT_IMAGE( _image );
    }
    outline0("LDA (TMPPTR),Y" );
    outline1("STA %s", result->realName );
    outline0("INY" );
    outline0("LDA (TMPPTR),Y" );
    outline1("STA %s", address_displacement(_environment, result->realName, "1") );
 
    return result;
 
}