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253 lines
6.9 KiB
253 lines
6.9 KiB
/***************************************************************************************
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*
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* histogram.cc is part of SimpleSkyCam.
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*
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*****************************************************************************************/
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#include <math.h>
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#include "simpleskycam.h"
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#include "histogram.h"
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#include "gui.h"
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#include "configuration.h"
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#include "video.h"
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#define HISTOGRAM_WIDTH 256
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#define HISTOGRAM_MARGIN 16
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GtkWidget *histogram_da = NULL;
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int histogram[3][HISTOGRAM_WIDTH]; // 6* hist_width min, max, min , max.....
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int histogram_max; // max vlaue
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int histogram_zoom_start = 0; // first zoom value
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int histogram_zoom_stop = HISTOGRAM_WIDTH-1; // second zoom value
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int histogram_x; // current mouse x-coordinate
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int histogram_pressed_x; // window x-coordinate when pressing a button
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int histogram_released_x; // window x-coordinate when releasing a button
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int histogram_pressed = 0; // indicates button pressed or not
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int histogram_zoomed = 0; // indicates zoom
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extern GtkBuilder *_builder_; // work around for threads
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void cb_histogramda_draw(GtkWidget *area, cairo_t *cr, int w, int h, gpointer data) {
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int clientw, clienth, px, px2, py2;
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GdkRGBA color;
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char txt[255];
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if (histogram_da == NULL) // should only be called once
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histogram_da = GTK_WIDGET(gtk_builder_get_object (GTK_BUILDER(_builder_), "histogram-da"));
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clienth = gtk_widget_get_allocated_height(histogram_da);
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clientw = gtk_widget_get_allocated_width(histogram_da);
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//
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// put the drawing area on the screen
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cairo_paint(cr);
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cairo_fill (cr);
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if (histogram_max == 0) return;
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for (int chan = 0; chan < 3; chan++) {
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switch (chan) {
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case 0:
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color.blue = 0.0;
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color.red = 1.0;
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color.green = 0.0;
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color.alpha = 0.5;
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break;
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case 1:
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color.blue = 0.0;
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color.red = 0.0;
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color.green = 1.0;
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color.alpha = 0.5;
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break;
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case 2:
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color.blue = 1.0;
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color.red = 0.0;
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color.green = 0.0;
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color.alpha = 0.5;
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break;
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}
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gdk_cairo_set_source_rgba(cr, &color);
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int histogram_width = histogram_zoom_stop - histogram_zoom_start + 1;
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int histogram_scale = histogram_width - 1 > 0 ? histogram_width - 1 : 1;
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for (int i = 0; i < histogram_width; i++) {
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px = HISTOGRAM_MARGIN + ((clientw-HISTOGRAM_MARGIN*2) * i) / histogram_scale;
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if (config.GetHistogramLog())
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py2 = (clienth-HISTOGRAM_MARGIN) - ((clienth-HISTOGRAM_MARGIN*2) * log10(histogram[chan][histogram_zoom_start+i]+1) / log10(histogram_max));
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else
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py2 = (clienth-HISTOGRAM_MARGIN) - ((clienth-HISTOGRAM_MARGIN*2) * histogram[chan][histogram_zoom_start+i] / histogram_max);
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if (i == 0) cairo_move_to(cr, px, py2);
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else cairo_line_to(cr, px, py2);
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}
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cairo_stroke(cr);
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if (histogram_pressed) {
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if (histogram_pressed_x < histogram_x) {
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px = histogram_pressed_x;
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px2 = histogram_x;
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} else {
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px2 = histogram_pressed_x;
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px = histogram_x;
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}
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cairo_set_source_rgba(cr, 0.5, 0.5, 0.5, 0.5);
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cairo_rectangle (cr, px, 0, px2-px, clienth);
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cairo_fill (cr);
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}
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}
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// draw some text
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if (config.GetHistogramLog()) snprintf (txt, 255, "%d - Log", histogram_max);
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else snprintf (txt, 255, "%d - Lin", histogram_max);
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for (int i = 0; i < 5; i++) {
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int dx, dy;
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switch (i) {
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case 0:
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cairo_set_source_rgb(cr, 1.0, 1.0, 1.0);
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dx = -1;
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dy = 0;
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break;
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case 1:
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dx = +1;
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dy = 0;
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break;
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case 2:
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dx = 0;
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dy = -1;
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break;
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case 3:
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dx = 0;
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dy = +1;
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break;
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case 4:
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cairo_set_source_rgb(cr, 0.1, 0.1, 0.1);
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dx = 0;
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dy = 0;
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break;
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}
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cairo_select_font_face (cr, "sans-serif", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_BOLD);
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cairo_set_font_size (cr, 12);
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cairo_move_to (cr, 10+dx, 15+dy);
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cairo_show_text(cr, txt);
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cairo_stroke(cr);
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}
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};
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/*
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* test function
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*/
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void histogram_update(VideoFrame *vf) {
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// save some time
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static int to = 0;
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if ((++to) % 8 == 0) return;
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int chan, i, x, y;
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if (vf == NULL) return;
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if (vf->w <= 0 ) return;
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// initialize histogram
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memset (histogram, 0, sizeof(histogram));
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for (i = 0, x = 0; x < vf->w; x++) {
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for (y = 0; y < vf->h; y++) {
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for (chan = 0; chan < 3; chan++) {
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histogram[chan][vf->data[i++]]++;
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}
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}
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}
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if (histogram_da)
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gdk_window_invalidate_rect(gtk_widget_get_window(histogram_da), NULL, true);
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for (histogram_max = 0, chan = 0; chan < 3; chan++) for (i = 0; i < HISTOGRAM_WIDTH; i++)
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if (histogram_max < histogram[chan][i]) histogram_max = histogram[chan][i];
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};
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void cb_histogramda_motion (GtkWidget *widget, GdkEvent *event, gpointer data) {
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if(!histogram_zoomed) {
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histogram_x = (int)round(event->button.x);
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}
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};
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void cb_histogramda_btnpress (GtkWidget *widget, gpointer data) {
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if (!histogram_zoomed) {
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if (!histogram_pressed) {
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histogram_pressed = 1;
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histogram_pressed_x = histogram_x;
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}
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} else {
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histogram_zoomed = 0;
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histogram_zoom_start = 0;
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histogram_zoom_stop = HISTOGRAM_WIDTH-1;
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}
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};
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void cb_histogramda_btnrelease (GtkWidget *widget, gpointer data) {
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if (!histogram_zoomed) {
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if (histogram_pressed) {
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histogram_pressed = 0;
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histogram_released_x = histogram_x;
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histogram_zoomed = 1;
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// here we need to compute start/stop coordinates inside histogram
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int clientw;
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clientw = gtk_widget_get_allocated_width(histogram_da);
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// translate first coordinate
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histogram_zoom_start = (histogram_pressed_x - HISTOGRAM_MARGIN) * HISTOGRAM_WIDTH / (clientw - HISTOGRAM_MARGIN*2);
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if (histogram_zoom_start < 0) histogram_zoom_start = 0;
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if (histogram_zoom_start >= HISTOGRAM_WIDTH) histogram_zoom_start = HISTOGRAM_WIDTH-1;
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// translate second coordinate
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histogram_zoom_stop = (histogram_released_x - HISTOGRAM_MARGIN) * HISTOGRAM_WIDTH / (clientw - HISTOGRAM_MARGIN*2) + 1;
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// limit the values
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if (histogram_zoom_stop < 0) histogram_zoom_stop = 0;
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if (histogram_zoom_stop >= HISTOGRAM_WIDTH) histogram_zoom_stop = HISTOGRAM_WIDTH-1;
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// exchange the values if necessary
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if (histogram_zoom_start > histogram_zoom_stop) {
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int t = histogram_zoom_start;
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histogram_zoom_start = histogram_zoom_stop;
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histogram_zoom_stop = t;
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}
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}
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}
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};
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void cb_histogramda_keypress (GtkWidget *widget, GdkEventKey *event, gpointer data) {
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printf ("%s:%d %s\n", __FILE__, __LINE__, __FUNCTION__);
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if (event == NULL) return;
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else if (event->keyval == 'l') config.SetHistogramLog(config.GetHistogramLog() == 0);
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};
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void cb_histogram_show_window (GtkWidget *widget, gpointer data) {
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printf ("%s:%d %s\n", __FILE__, __LINE__, __FUNCTION__);
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GtkWidget *wnd = GTK_WIDGET(gtk_builder_get_object (GTK_BUILDER(_builder_), "window-histogram"));
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gtk_widget_show(wnd);
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};
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void cb_menu_set_histlog (GtkCheckMenuItem *checkmenuitem, gpointer user_data) {
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config.SetHistogramLog(gtk_check_menu_item_get_active(checkmenuitem) == TRUE);
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}
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