mirror of
https://github.com/eddyem/eddys_snippets.git
synced 2026-03-20 00:30:59 +03:00
Almost ready image view OpenGL module
This commit is contained in:
Eddy
398
image_view_module/imageview.c
Normal file
398
image_view_module/imageview.c
Normal file
@@ -0,0 +1,398 @@
|
||||
// bmpview.c
|
||||
//
|
||||
// Copyright 2010 Edward V. Emelianoff <eddy@sao.ru>
|
||||
//
|
||||
// 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.
|
||||
//
|
||||
// This program is distributed in the hope that it will be useful,
|
||||
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
// GNU General Public License for more details.
|
||||
//
|
||||
// You should have received a copy of the GNU General Public License
|
||||
// along with this program; if not, write to the Free Software
|
||||
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
|
||||
// MA 02110-1301, USA.
|
||||
//-lglut
|
||||
#include "imageview.h"
|
||||
#include "macros.h"
|
||||
#include <pthread.h>
|
||||
#include <X11/Xlib.h> // XInitThreads();
|
||||
|
||||
int totWindows = 0; // total number of opened windows
|
||||
|
||||
pthread_t GLUTthread; // main GLUT thread
|
||||
pthread_mutex_t winini_mutex = PTHREAD_MUTEX_INITIALIZER; // mutex for windows initialization
|
||||
volatile int wannacreate = 0; // flag: ==1 if someone wants to create window
|
||||
windowData *wininiptr = NULL;
|
||||
|
||||
int initialized = 0; // ==1 if GLUT is initialized; ==0 after clear_GL_context
|
||||
|
||||
void createWindow(windowData *win);
|
||||
void RedrawWindow();
|
||||
void Resize(int width, int height);
|
||||
|
||||
/**
|
||||
* calculate window properties on creating & resizing
|
||||
*/
|
||||
void calc_win_props(windowData *win, GLfloat *Wortho, GLfloat *Hortho){
|
||||
if(!win || ! win->image) return;
|
||||
double a, A, w, h, W, H;
|
||||
double Zoom = win->zoom;
|
||||
w = (double)win->image->w / 2.;
|
||||
h = (double)win->image->h / 2.;
|
||||
W = (double)win->w;
|
||||
H = (double)win->h;
|
||||
A = W / H;
|
||||
a = w / h;
|
||||
if(A > a){ // now W & H are parameters for glOrtho
|
||||
win->Daspect = h / H * 2.;
|
||||
W = h * A; H = h;
|
||||
}else{
|
||||
win->Daspect = w / W * 2.;
|
||||
H = w / A; W = w;
|
||||
}
|
||||
if(Wortho) *Wortho = W;
|
||||
if(Hortho) *Hortho = H;
|
||||
// calculate coordinates of center
|
||||
win->x0 = W/Zoom - w + win->x / Zoom;
|
||||
win->y0 = H / Zoom + h - win->y / Zoom;
|
||||
}
|
||||
|
||||
/**
|
||||
* create window & run main loop
|
||||
*/
|
||||
void createWindow(windowData *win){
|
||||
FNAME();
|
||||
if(!initialized) return;
|
||||
if(!win) return;
|
||||
int w = win->w, h = win->h;
|
||||
DBG("create window with title %s", win->title);
|
||||
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
|
||||
glutInitWindowSize(w, h);
|
||||
win->GL_ID = glutCreateWindow(win->title);
|
||||
DBG("created GL_ID=%d", win->GL_ID);
|
||||
glutReshapeFunc(Resize);
|
||||
glutDisplayFunc(RedrawWindow);
|
||||
glutKeyboardFunc(keyPressed);
|
||||
glutSpecialFunc(keySpPressed);
|
||||
//glutMouseWheelFunc(mouseWheel);
|
||||
glutMouseFunc(mousePressed);
|
||||
glutMotionFunc(mouseMove);
|
||||
//glutIdleFunc(glutPostRedisplay);
|
||||
glutIdleFunc(NULL);
|
||||
DBG("init textures");
|
||||
glGenTextures(1, &(win->Tex));
|
||||
calc_win_props(win, NULL, NULL);
|
||||
win->zoom = 1. / win->Daspect;
|
||||
// createMenu(win->ID);
|
||||
glEnable(GL_TEXTURE_2D);
|
||||
glBindTexture(GL_TEXTURE_2D, win->Tex);
|
||||
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
|
||||
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
|
||||
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
|
||||
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
|
||||
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
|
||||
//glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, w, h, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
|
||||
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, win->image->w, win->image->h, 0,
|
||||
GL_RGB, GL_UNSIGNED_BYTE, win->image->rawdata);
|
||||
glDisable(GL_TEXTURE_2D);
|
||||
totWindows++;
|
||||
DBG("OK, total opened windows: %d", totWindows);
|
||||
}
|
||||
|
||||
|
||||
int killwindow(int GL_ID){
|
||||
DBG("try to kill win GL_ID=%d", GL_ID);
|
||||
windowData *win;
|
||||
int canceled = 1;
|
||||
win = searchWindow_byGLID(GL_ID);
|
||||
if(!win) return 0;
|
||||
if(!pthread_cancel(win->thread)){ // cancel thread changing data
|
||||
canceled = 0;
|
||||
}
|
||||
// pthread_join(win->thread, NULL);
|
||||
glDeleteTextures(1, &win->Tex);
|
||||
glFinish();
|
||||
glutDestroyWindow(win->GL_ID);
|
||||
win->GL_ID = 0; // reset for forEachWindow()
|
||||
pthread_mutex_unlock(&win->mutex);
|
||||
if(!canceled && !pthread_cancel(win->thread)){ // cancel thread changing data
|
||||
WARN(_("can't cancel a thread!"));
|
||||
}
|
||||
pthread_join(win->thread, NULL);
|
||||
if(!removeWindow(win->ID)) WARNX(_("Error removing from list"));
|
||||
totWindows--;
|
||||
return 1;
|
||||
}
|
||||
|
||||
/**
|
||||
* destroy window with OpenGL or inner identificator "window"
|
||||
* @param window inner or OpenGL id
|
||||
* @param idtype = INNER or OPENGL
|
||||
* @return 1 in case of OK, 0 if fault
|
||||
*/
|
||||
int destroyWindow(int window, winIdType type){
|
||||
if(!initialized) return 0;
|
||||
int r = 0;
|
||||
pthread_mutex_lock(&winini_mutex);
|
||||
if(type == INNER){
|
||||
windowData *win = searchWindow(window);
|
||||
if(win) r = killwindow(win->GL_ID);
|
||||
}else
|
||||
r = killwindow(window);
|
||||
pthread_mutex_unlock(&winini_mutex);
|
||||
return r;
|
||||
}
|
||||
|
||||
void renderBitmapString(float x, float y, void *font, char *string, GLubyte *color){
|
||||
if(!initialized) return;
|
||||
char *c;
|
||||
int x1=x, W=0;
|
||||
for(c = string; *c; c++){
|
||||
W += glutBitmapWidth(font,*c);// + 1;
|
||||
}
|
||||
x1 -= W/2;
|
||||
glColor3ubv(color);
|
||||
glLoadIdentity();
|
||||
glTranslatef(0.,0., -150);
|
||||
//glTranslatef(x,y, -4000.);
|
||||
for (c = string; *c != '\0'; c++){
|
||||
glColor3ubv(color);
|
||||
glRasterPos2f(x1,y);
|
||||
glutBitmapCharacter(font, *c);
|
||||
//glutStrokeCharacter(GLUT_STROKE_ROMAN, *c);
|
||||
x1 = x1 + glutBitmapWidth(font,*c);// + 1;
|
||||
}
|
||||
}
|
||||
|
||||
void redisplay(int GL_ID){
|
||||
if(!initialized) return;
|
||||
glutSetWindow(GL_ID);
|
||||
glutPostRedisplay();
|
||||
}
|
||||
|
||||
/*
|
||||
if(redraw)
|
||||
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, w, h,
|
||||
GL_LUMINANCE, GL_FLOAT, ptro); // s/image->data/tex/
|
||||
else
|
||||
glTexImage2D(GL_TEXTURE_2D, 0, GL_INTENSITY, w, h,
|
||||
0, GL_LUMINANCE, GL_FLOAT, ptro);
|
||||
//glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
|
||||
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
|
||||
//glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
|
||||
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
|
||||
*/
|
||||
|
||||
void RedrawWindow(){
|
||||
if(!initialized) return;
|
||||
int window;
|
||||
window = glutGetWindow();
|
||||
windowData *win = searchWindow_byGLID(window);
|
||||
if(!win) return;
|
||||
if(pthread_mutex_trylock(&win->mutex) != 0) return;
|
||||
int w = win->image->w, h = win->image->h;
|
||||
glClearColor(0.0, 0.0, 0.0, 1.0);
|
||||
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
|
||||
glLoadIdentity();
|
||||
//glTranslatef(win->x-w/2., win->y-h/2., win->z);
|
||||
glTranslatef(win->x, win->y, 0.);
|
||||
glScalef(-win->zoom, -win->zoom, 1.);
|
||||
glEnable(GL_TEXTURE_2D);
|
||||
glBindTexture(GL_TEXTURE_2D, win->Tex);
|
||||
if(win->image->changed){
|
||||
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
|
||||
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, w, h, GL_RGB, GL_UNSIGNED_BYTE, win->image->rawdata);
|
||||
win->image->changed = 0;
|
||||
}
|
||||
/*
|
||||
glBegin(GL_QUADS);
|
||||
glTexCoord2f(0., 1.); glVertex3f(0., 0., 0.);
|
||||
glTexCoord2f(0., 0.); glVertex3f(0.,h, 0.);
|
||||
glTexCoord2f(1., 0.); glVertex3f(w, h, 0.);
|
||||
glTexCoord2f(1., 1.); glVertex3f(w, 0., 0.);
|
||||
glEnd();
|
||||
*/
|
||||
w /= 2.; h /= 2.;
|
||||
glBegin(GL_QUADS);
|
||||
glTexCoord2f(0.0f, 0.0f); glVertex2f(-w, -h );
|
||||
glTexCoord2f(1.0f, 0.0f); glVertex2f( w, -h );
|
||||
glTexCoord2f(1.0f, 1.0f); glVertex2f( w, h );
|
||||
glTexCoord2f(0.0f, 1.0f); glVertex2f(-w, h );
|
||||
glEnd();
|
||||
glDisable(GL_TEXTURE_2D);
|
||||
glFinish();
|
||||
glutSwapBuffers();
|
||||
pthread_mutex_unlock(&win->mutex);
|
||||
}
|
||||
|
||||
/**
|
||||
* main freeGLUT loop
|
||||
* waits for global signals to create windows & make other actions
|
||||
*/
|
||||
void *Redraw(_U_ void *arg){
|
||||
while(1){
|
||||
pthread_mutex_lock(&winini_mutex);
|
||||
if(!initialized) return NULL;
|
||||
if(wannacreate){ // someone asks to create window
|
||||
DBG("call for window creating, id: %d", wininiptr->ID);
|
||||
createWindow(wininiptr);
|
||||
DBG("done!");
|
||||
wininiptr = NULL;
|
||||
wannacreate = 0;
|
||||
}
|
||||
forEachWindow(redisplay);
|
||||
pthread_mutex_unlock(&winini_mutex);
|
||||
if(totWindows) glutMainLoopEvent(); // process actions if there are windows
|
||||
usleep(10000);
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
|
||||
void Resize(int width, int height){
|
||||
if(!initialized) return;
|
||||
int window = glutGetWindow();
|
||||
windowData *win = searchWindow_byGLID(window);
|
||||
if(!win) return;
|
||||
/* int GRAB_WIDTH = win->w, GRAB_HEIGHT = win->h;
|
||||
float _U_ tmp, wd = (float) width/GRAB_WIDTH, ht = (float)height/GRAB_HEIGHT;
|
||||
tmp = (wd + ht) / 2.;
|
||||
width = (int)(tmp * GRAB_WIDTH); height = (int)(tmp * GRAB_HEIGHT);*/
|
||||
glutReshapeWindow(width, height);
|
||||
win->w = width;
|
||||
win->h = height;
|
||||
glViewport(0, 0, width, height);
|
||||
glMatrixMode(GL_PROJECTION);
|
||||
glLoadIdentity();
|
||||
//GLfloat W = (GLfloat)GRAB_WIDTH; GLfloat H = (GLfloat)GRAB_HEIGHT;
|
||||
GLfloat W, H;
|
||||
calc_win_props(win, &W, &H);
|
||||
glOrtho(-W,W, -H,H, -1., 1.);
|
||||
// gluPerspective(90., W/H, 0., 100.0);
|
||||
// gluLookAt(0., 0., H/2., 0., 0., 0., 0., 1., 0.);
|
||||
glMatrixMode(GL_MODELVIEW);
|
||||
glLoadIdentity();
|
||||
}
|
||||
|
||||
/**
|
||||
* create new window, run thread & return pointer to its structure or NULL
|
||||
* asynchroneous call from outside
|
||||
* wait for window creating & return its data
|
||||
* @param title - header (copyed inside this function)
|
||||
* @param w,h - image size
|
||||
* @param rawdata - NULL (then the memory will be allocated here with size w x h)
|
||||
* or allocated outside data
|
||||
*/
|
||||
windowData *createGLwin(char *title, int w, int h, rawimage *rawdata){
|
||||
FNAME();
|
||||
if(!initialized) return NULL;
|
||||
windowData *win = MALLOC(windowData, 1);
|
||||
if(!addWindow(win)){
|
||||
FREE(win);
|
||||
return NULL;
|
||||
}
|
||||
rawimage *raw;
|
||||
if(rawdata){
|
||||
raw = rawdata;
|
||||
}else{
|
||||
raw = MALLOC(rawimage, 1);
|
||||
if(raw){
|
||||
raw->rawdata = MALLOC(GLubyte, w*h*3);
|
||||
raw->w = w;
|
||||
raw->h = h;
|
||||
raw->changed = 1;
|
||||
// raw->protected is zero automatically
|
||||
}
|
||||
}
|
||||
if(!raw || !raw->rawdata){
|
||||
free(raw);
|
||||
return NULL;
|
||||
}
|
||||
win->title = strdup(title);
|
||||
win->image = raw;
|
||||
if(pthread_mutex_init(&win->mutex, NULL)){
|
||||
WARN(_("Can't init mutex!"));
|
||||
removeWindow(win->ID);
|
||||
return NULL;
|
||||
}
|
||||
win->w = w;
|
||||
win->h = h;
|
||||
while(wannacreate); // wait if there was another creating
|
||||
pthread_mutex_lock(&winini_mutex);
|
||||
wininiptr = win;
|
||||
wannacreate = 1;
|
||||
pthread_mutex_unlock(&winini_mutex);
|
||||
DBG("wait for creatin");
|
||||
while(wannacreate); // wait until window created from main thread
|
||||
DBG("window created");
|
||||
return win;
|
||||
}
|
||||
|
||||
/**
|
||||
* Init freeGLUT
|
||||
*/
|
||||
void imageview_init(){
|
||||
FNAME();
|
||||
char *v[] = {PROJNAME, NULL};
|
||||
int c = 1;
|
||||
static int glutnotinited = 1;
|
||||
if(initialized){
|
||||
// "Уже инициализировано!"
|
||||
WARNX(_("Already initialized!"));
|
||||
return;
|
||||
}
|
||||
if(glutnotinited){
|
||||
XInitThreads(); // we need it for threaded windows
|
||||
glutInit(&c, v);
|
||||
glutnotinited = 0;
|
||||
}
|
||||
glutSetOption(GLUT_ACTION_ON_WINDOW_CLOSE, GLUT_ACTION_CONTINUE_EXECUTION);
|
||||
pthread_create(&GLUTthread, NULL, &Redraw, NULL);
|
||||
initialized = 1;
|
||||
}
|
||||
|
||||
void killwindow_v(int GL_ID){
|
||||
DBG("GL_ID: %d", GL_ID);
|
||||
killwindow(GL_ID);
|
||||
}
|
||||
|
||||
/**
|
||||
* Close all opened windows and terminate main GLUT thread
|
||||
*/
|
||||
void clear_GL_context(){
|
||||
FNAME();
|
||||
if(!initialized) return;
|
||||
pthread_mutex_lock(&winini_mutex);
|
||||
forEachWindow(killwindow_v);
|
||||
pthread_cancel(GLUTthread); // kill main GLUT thread
|
||||
pthread_join(GLUTthread, NULL);
|
||||
initialized = 0;
|
||||
pthread_mutex_unlock(&winini_mutex);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Coordinates transformation from CS of drawingArea into CS of picture
|
||||
* x,y - pointer coordinates
|
||||
* X,Y - coordinates of appropriate point at picture
|
||||
*/
|
||||
void conv_mouse_to_image_coords(int x, int y,
|
||||
float *X, float *Y,
|
||||
windowData *window){
|
||||
float a = window->Daspect / window->zoom;
|
||||
*X = x * a - window->x0;
|
||||
*Y = window->y0 - y * a;
|
||||
}
|
||||
|
||||
void conv_image_to_mouse_coords(float X, float Y,
|
||||
int *x, int *y,
|
||||
windowData *window){
|
||||
float a = window->zoom / window->Daspect;
|
||||
*x = (X + window->x0) * a;
|
||||
*y = (window->y0 - Y) * a;
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user