/* * 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; }