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161 lines
3.5 KiB
161 lines
3.5 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 "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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GtkWidget *histogram_da = NULL;
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int histogram[3][256]; // 6* hist_width min, max, min , max.....
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int histogram_max; // max vlaue
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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, 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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for (int i = 0; i < 256; i++) {
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px = 16 + ((clientw-32) * i) / 256;
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py2 = (clienth-16) - ((clienth-32) * histogram[chan][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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}
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// draw some text
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snprintf (txt, 255, "%d", 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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for (chan = 0; chan < 3; chan++) for (i = 0; i < 256; i++)
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histogram[chan][i] = 0;
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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 < 256; 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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// printf ("%s:%d %s\n", __FILE__, __LINE__, __FUNCTION__);
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};
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void cb_histogramda_btnpress (GtkWidget *widget, gpointer data) {
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printf ("%s:%d %s\n", __FILE__, __LINE__, __FUNCTION__);
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};
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void cb_histogramda_btnrelease (GtkWidget *widget, gpointer data) {
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printf ("%s:%d %s\n", __FILE__, __LINE__, __FUNCTION__);
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};
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