guiimage.cpp

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/***************************************************************************
 
    file                 : guiimage.cpp
    created              : Wed May  1 10:29:28 CEST 2002
    copyright            : (C) 2001-2026 by Eric Espié, Bernhard Wymann
    email                : berniw@bluewin.ch
 
 ***************************************************************************/
 
/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

 
#include <stdlib.h>
#ifdef WIN32
#include <windows.h>
#endif
#include <tgfclient.h>
#include "gui.h"
 

int GfuiStaticImageCreate(void *scr, int x, int y, int w, int h, char *name)
{
    tGfuiImage *image;
    tGfuiObject *object;
    tGfuiScreen *screen = (tGfuiScreen*)scr;
 
    if (!screen) {
        return -1;
    }
 
    object = (tGfuiObject*)calloc(1, sizeof(tGfuiObject));
    if (!object) {
        return -1;
    }
    object->widget = GFUI_IMAGE;
    object->focusMode = GFUI_FOCUS_NONE;
    object->visible = 1;
    object->id = screen->curId++;
 
    image = &(object->u.image);
    image->texture = name ? GfImgReadTex(name) : 0;
 
    object->xmin = x;
    object->xmax = x + w;
    object->ymin = y;
    object->ymax = y + h;
 
    gfuiAddObject(screen, object);
 
    return object->id;
}

void GfuiStaticImageSet(void *scr, int id, char *name)
{
    tGfuiObject *curObject;
    tGfuiScreen *screen = (tGfuiScreen*)scr;
    tGfuiImage *image;
 
    curObject = screen->objects;
    if (curObject != NULL) {
        do {
            curObject = curObject->next;
            if (curObject->id == id) {
                if (curObject->widget == GFUI_IMAGE) {
                    image = &(curObject->u.image);
                    GfImgFreeTex(image->texture);
                    image->texture = name ? GfImgReadTex(name) : 0;
                }
            return;
            }
        } while (curObject != screen->objects);
    }
}
 
void
gfuiReleaseImage(tGfuiObject *obj)
{
    tGfuiImage    *image;
 
    image = &(obj->u.image);
    GfImgFreeTex(image->texture);
    free(obj);
}
 
void
gfuiDrawImage(tGfuiObject *obj)
{
    tGfuiImage    *image;
 
    image = &(obj->u.image);
    if (!image->texture) {
        return;
    }
 
    glEnable(GL_TEXTURE_2D);
    glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
    glBindTexture(GL_TEXTURE_2D, image->texture);
 
    glBegin(GL_TRIANGLE_STRIP);
    {
    glColor4f(1.0, 1.0, 1.0, 0.0);
    glTexCoord2f(0.0, 0.0); glVertex2f(obj->xmin, obj->ymin);
    glTexCoord2f(0.0, 1.0); glVertex2f(obj->xmin, obj->ymax);
    glTexCoord2f(1.0, 0.0); glVertex2f(obj->xmax, obj->ymin);
    glTexCoord2f(1.0, 1.0); glVertex2f(obj->xmax, obj->ymax);
    }
    glEnd();
    glBindTexture(GL_TEXTURE_2D, 0);
    glDisable(GL_TEXTURE_2D);
}