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Diffstat (limited to 'progs/redbook/histogram.c')
| -rw-r--r-- | progs/redbook/histogram.c | 213 |
1 files changed, 0 insertions, 213 deletions
diff --git a/progs/redbook/histogram.c b/progs/redbook/histogram.c deleted file mode 100644 index 12b0e315ca..0000000000 --- a/progs/redbook/histogram.c +++ /dev/null @@ -1,213 +0,0 @@ -/* - * Copyright (c) 1993-2003, Silicon Graphics, Inc. - * All Rights Reserved - * - * Permission to use, copy, modify, and distribute this software for any - * purpose and without fee is hereby granted, provided that the above - * copyright notice appear in all copies and that both the copyright - * notice and this permission notice appear in supporting documentation, - * and that the name of Silicon Graphics, Inc. not be used in - * advertising or publicity pertaining to distribution of the software - * without specific, written prior permission. - * - * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "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, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT, - * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, - * OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION, LOSS OF - * PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF THIRD - * PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN ADVISED OF - * THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON ANY THEORY OF - * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE POSSESSION, USE - * OR PERFORMANCE OF THIS SOFTWARE. - * - * US Government Users Restricted Rights - * Use, duplication, or disclosure by the Government is subject to - * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph - * (c)(1)(ii) of the Rights in Technical Data and Computer Software - * clause at DFARS 252.227-7013 and/or in similar or successor clauses - * in the FAR or the DOD or NASA FAR Supplement. Unpublished - rights - * reserved under the copyright laws of the United States. - * - * Contractor/manufacturer is: - * Silicon Graphics, Inc. - * 1500 Crittenden Lane - * Mountain View, CA 94043 - * United State of America - * - * OpenGL(R) is a registered trademark of Silicon Graphics, Inc. - */ - -/* - * histogram.c - * Compute the histogram of the image. This program illustrates the - * use of the glHistogram() function. - */ - -#include <GL/glew.h> -#include <GL/glut.h> -#include <assert.h> -#include <stdlib.h> -#include <stdio.h> - -#define HISTOGRAM_SIZE 256 /* Must be a power of 2 */ - - -static GLubyte *pixels; -static GLsizei width, height; - - - -static GLuint bswap(GLuint x) -{ - const GLuint ui = 1; - const GLubyte *ubp = (const GLubyte *) &ui; - if (*ubp == 1) { - /* we're on little endiang so byteswap x */ - GLsizei y = ((x >> 24) - | ((x >> 8) & 0xff00) - | ((x << 8) & 0xff0000) - | ((x << 24) & 0xff000000)); - return y; - } - else { - return x; - } -} - - -static GLubyte* -readImage( const char* filename, GLsizei* width, GLsizei *height ) -{ - int n; - GLubyte* pixels; - size_t num_read; - - FILE* infile = fopen( filename, "rb" ); - - if ( !infile ) { - fprintf( stderr, "Unable to open file '%s'\n", filename ); - exit(1); - } - - num_read = fread( width, sizeof( GLsizei ), 1, infile ); - assert(num_read == 1); - num_read = fread( height, sizeof( GLsizei ), 1, infile ); - assert(num_read == 1); - - *width = bswap(*width); - *height = bswap(*height); - - n = 3 * (*width) * (*height); - - pixels = (GLubyte *) malloc( n * sizeof( GLubyte )); - if ( !pixels ) { - fprintf( stderr, "Unable to malloc() bytes for pixels\n" ); - fclose( infile ); - return NULL; - } - - num_read = fread( pixels, sizeof( GLubyte ), n, infile ); - assert(num_read == n); - - fclose( infile ); - - return pixels; -} - -static void init(void) -{ - if (!glutExtensionSupported("GL_ARB_imaging")) { - fprintf(stderr, "Sorry, this program requires GL_ARB_imaging.\n"); - exit(1); - } - - glPixelStorei(GL_UNPACK_ALIGNMENT, 1); - glClearColor(0.0, 0.0, 0.0, 0.0); - - glHistogram(GL_HISTOGRAM, HISTOGRAM_SIZE, GL_RGB, GL_FALSE); - glEnable(GL_HISTOGRAM); -} - -static void display(void) -{ - int i; - GLushort values[HISTOGRAM_SIZE][3]; - - glClear(GL_COLOR_BUFFER_BIT); - glRasterPos2i(1, 1); - glDrawPixels(width, height, GL_RGB, GL_UNSIGNED_BYTE, pixels); - - glGetHistogram(GL_HISTOGRAM, GL_TRUE, GL_RGB, GL_UNSIGNED_SHORT, values); - - /* Plot histogram */ - - glBegin(GL_LINE_STRIP); - glColor3f(1.0, 0.0, 0.0); - for ( i = 0; i < HISTOGRAM_SIZE; i++ ) - glVertex2s(i, values[i][0]); - glEnd(); - - glBegin(GL_LINE_STRIP); - glColor3f(0.0, 1.0, 0.0); - for ( i = 0; i < HISTOGRAM_SIZE; i++ ) - glVertex2s(i, values[i][1]); - glEnd(); - - glBegin(GL_LINE_STRIP); - glColor3f(0.0, 0.0, 1.0); - for ( i = 0; i < HISTOGRAM_SIZE; i++ ) - glVertex2s(i, values[i][2]); - glEnd(); - glFlush(); -} - -static void reshape(int w, int h) -{ - glViewport(0, 0, (GLsizei) w, (GLsizei) h); - glMatrixMode(GL_PROJECTION); - glLoadIdentity(); - glOrtho(0, 256, 0, 10000, -1.0, 1.0); - glMatrixMode(GL_MODELVIEW); -} - -static void keyboard(unsigned char key, int x, int y) -{ - static GLboolean sink = GL_FALSE; - - switch (key) { - case 's' : - sink = !sink; - glHistogram(GL_HISTOGRAM, HISTOGRAM_SIZE, GL_RGB, sink); - break; - - case 27: - exit(0); - } - glutPostRedisplay(); - -} - -/* Main Loop - * Open window with initial window size, title bar, - * RGBA display mode, and handle input events. - */ -int main(int argc, char** argv) -{ - pixels = readImage("leeds.bin", &width, &height); - - glutInit(&argc, argv); - glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB); - glutInitWindowSize(width, height); - glutInitWindowPosition(100, 100); - glutCreateWindow(argv[0]); - glewInit(); - init(); - glutReshapeFunc(reshape); - glutKeyboardFunc(keyboard); - glutDisplayFunc(display); - glutMainLoop(); - return 0; -} |