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/*
* Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software and
* its documentation for any purpose is hereby granted without fee, provided
* that (i) the above copyright notices and this permission notice appear in
* all copies of the software and related documentation, and (ii) the name of
* Silicon Graphics may not be used in any advertising or
* publicity relating to the software without the specific, prior written
* permission of Silicon Graphics.
*
* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF
* ANY KIND,
* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
*
* IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR
* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <GL/glut.h>
#include "loadppm.c"
GLenum doubleBuffer;
GLint windW, windH;
char *fileName = 0;
PPMImage *image;
float point[3];
float zoom;
GLint x, y;
static void Init(void)
{
glClearColor(0.0, 0.0, 0.0, 0.0);
x = 0;
y = windH;
zoom = 1.8;
}
static void Reshape(int width, int height)
{
windW = (GLint)width;
windH = (GLint)height;
glViewport(0, 0, windW, windH);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(0, windW, 0, windH);
glMatrixMode(GL_MODELVIEW);
}
static void Key(unsigned char key, int x, int y)
{
switch (key) {
case 27:
exit(1);
case 'Z':
zoom += 0.2;
break;
case 'z':
zoom -= 0.2;
if (zoom < 0.2) {
zoom = 0.2;
}
break;
default:
return;
}
glutPostRedisplay();
}
static void Mouse(int button, int state, int mouseX, int mouseY)
{
if (state != GLUT_DOWN)
return;
x = (GLint)mouseX;
y = (GLint)mouseY;
glutPostRedisplay();
}
static void Draw(void)
{
glClear(GL_COLOR_BUFFER_BIT);
point[0] = (windW / 2) - (image->sizeX / 2);
point[1] = (windH / 2) - (image->sizeY / 2);
point[2] = 0;
glRasterPos3fv(point);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glPixelZoom(1.0, 1.0);
glDrawPixels(image->sizeX, image->sizeY, GL_RGB, GL_UNSIGNED_BYTE,
image->data);
point[0] = (float)x;
point[1] = windH - (float)y;
point[2] = 0.0;
glRasterPos3fv(point);
glPixelZoom(zoom, zoom);
glCopyPixels((windW/2)-(image->sizeX/2),
(windH/2)-(image->sizeY/2),
image->sizeX, image->sizeY, GL_COLOR);
glFlush();
if (doubleBuffer) {
glutSwapBuffers();
}
}
static GLenum Args(int argc, char **argv)
{
GLint i;
doubleBuffer = GL_FALSE;
for (i = 1; i < argc; i++) {
if (strcmp(argv[i], "-sb") == 0) {
doubleBuffer = GL_FALSE;
} else if (strcmp(argv[i], "-db") == 0) {
doubleBuffer = GL_TRUE;
} else if (strcmp(argv[i], "-f") == 0) {
if (i+1 >= argc || argv[i+1][0] == '-') {
printf("-f (No file name).\n");
return GL_FALSE;
} else {
fileName = argv[++i];
}
} else {
printf("%s (Bad option).\n", argv[i]);
return GL_FALSE;
}
}
return GL_TRUE;
}
int main(int argc, char **argv)
{
GLenum type;
glutInit(&argc, argv);
if (Args(argc, argv) == GL_FALSE) {
exit(1);
}
if (fileName == 0) {
printf("No image file.\n");
exit(1);
}
image = LoadPPM(fileName);
windW = 300;
windH = 300;
glutInitWindowPosition(0, 0); glutInitWindowSize( windW, windH);
type = GLUT_RGB;
type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
glutInitDisplayMode(type);
if (glutCreateWindow("Copy Test") == GL_FALSE) {
exit(1);
}
Init();
glutReshapeFunc(Reshape);
glutKeyboardFunc(Key);
glutMouseFunc(Mouse);
glutDisplayFunc(Draw);
glutMainLoop();
return 0;
}
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