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histogram

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master
Steffen Pohle 3 years ago
parent 1877e5951c
commit d4f71a7847
1 changed files with 78 additions and 114 deletions
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192
histogram.cc
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@ -12,122 +12,99 @@
GtkWidget *histogram_da = NULL;
GdkPixbuf *histogram_pixbuf = NULL;
int *hist_minmax = NULL; // 2* hist_width min, max, min , max.....
int hist_width = 0;
int histogram[3][256]; // 6* hist_width min, max, min , max.....
int histogram_max; // max vlaue
extern GtkBuilder *_builder_; // work around for threads
#define S_X(_x_) (((_x_) * clientw / pixbufw))
#define S_Y(_y_) (((_y_) * clienth / pixbufh))
void cb_histogramda_draw(GtkWidget *area, cairo_t *cr, int w, int h, gpointer data) {
int clientw, clienth, pixbufw, pixbufh;
int clientw, clienth, px, py2;
GdkRGBA color;
char txt[255];
if (histogram_da == NULL) // should only be called once
histogram_da = GTK_WIDGET(gtk_builder_get_object (GTK_BUILDER(_builder_), "histogram-da"));
//
// create or resize pixbuf if needed
clienth = gtk_widget_get_allocated_height(histogram_da);
clientw = gtk_widget_get_allocated_width(histogram_da);
if (histogram_pixbuf == NULL) {
histogram_pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, false, 8, clientw, clienth);
memset (gdk_pixbuf_get_pixels(histogram_pixbuf), 0, 3 * gdk_pixbuf_get_height(histogram_pixbuf) * gdk_pixbuf_get_width(histogram_pixbuf));
}
pixbufh = gdk_pixbuf_get_height(histogram_pixbuf);
pixbufw = gdk_pixbuf_get_width(histogram_pixbuf);
if (pixbufw != clientw || pixbufh != clienth) {
g_object_unref(histogram_pixbuf);
histogram_pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, false, 8, clientw, clienth);
memset (gdk_pixbuf_get_pixels(histogram_pixbuf), 0, 3 * gdk_pixbuf_get_height(histogram_pixbuf) * gdk_pixbuf_get_width(histogram_pixbuf));
}
//
// put the drawing area on the screen
gdk_cairo_set_source_pixbuf(cr, histogram_pixbuf, 0, 0);
cairo_paint(cr);
cairo_fill (cr);
//
// draw cross
color.blue = 1.0;
color.red = 0.0;
color.green = 1.0;
color.alpha = 1.0;
gdk_cairo_set_source_rgba(cr, &color);
cairo_move_to(cr, 0, 0);
cairo_line_to(cr, pixbufw, pixbufh);
cairo_move_to(cr, pixbufw, 0);
cairo_line_to(cr, 0, pixbufh);
cairo_stroke(cr);
//
// draw basic histogram
if (hist_minmax != NULL) {
//
// draw cross
color.blue = 0.75;
color.red = 0.75;
color.green = 0.75;
color.alpha = 0.8;
if (histogram_max == 0) return;
for (int chan = 0; chan < 3; chan++) {
switch (chan) {
case 0:
color.blue = 0.0;
color.red = 1.0;
color.green = 0.0;
color.alpha = 0.5;
break;
case 1:
color.blue = 0.0;
color.red = 0.0;
color.green = 1.0;
color.alpha = 0.5;
break;
case 2:
color.blue = 1.0;
color.red = 0.0;
color.green = 0.0;
color.alpha = 0.5;
break;
}
gdk_cairo_set_source_rgba(cr, &color);
int x, i; // position in histogram
int px, py1, py2; // screen pos x and line from to
for (int i = 0; i < 256; i++) {
px = 16 + ((clientw-32) * i) / 256;
py2 = (clienth-16) - ((clienth-32) * histogram[chan][i]) / histogram_max;
for (i = 0, x = 0; x < hist_width; x++) {
if (i == 0) cairo_move_to(cr, px, py2);
else cairo_line_to(cr, px, py2);
px = (pixbufw * x) / hist_width;
py1 = (pixbufh * hist_minmax[i++]) / 255;
py2 = (pixbufh * hist_minmax[i++]) / 255;
cairo_move_to(cr, px, py1);
cairo_line_to(cr, px, py2);
}
cairo_stroke(cr);
}
cairo_stroke(cr);
// draw some text
snprintf (txt, 255, "%d", histogram_max);
for (int i = 0; i < 5; i++) {
int dx, dy;
switch (i) {
case 0:
cairo_set_source_rgb(cr, 1.0, 1.0, 1.0);
dx = -1;
dy = 0;
break;
case 1:
dx = +1;
dy = 0;
break;
case 2:
dx = 0;
dy = -1;
break;
case 3:
dx = 0;
dy = +1;
break;
case 4:
cairo_set_source_rgb(cr, 0.1, 0.1, 0.1);
dx = 0;
dy = 0;
break;
}
}
// draw some text
for (int i = 0; i < 5; i++) {
int dx, dy;
switch (i) {
case 0:
cairo_set_source_rgb(cr, 1.0, 1.0, 1.0);
dx = -1;
dy = 0;
break;
case 1:
dx = +1;
dy = 0;
break;
case 2:
dx = 0;
dy = -1;
break;
case 3:
dx = 0;
dy = +1;
break;
case 4:
cairo_set_source_rgb(cr, 0.1, 0.1, 0.1);
dx = 0;
dy = 0;
break;
}
cairo_select_font_face (cr, "sans-serif", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_BOLD);
cairo_set_font_size (cr, 12);
cairo_move_to (cr, 10+dx, 15+dy);
cairo_show_text(cr, "Test");
cairo_stroke(cr);
}
cairo_select_font_face (cr, "sans-serif", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_BOLD);
cairo_set_font_size (cr, 12);
cairo_move_to (cr, 10+dx, 15+dy);
cairo_show_text(cr, txt);
cairo_stroke(cr);
}
};
@ -135,39 +112,26 @@ void cb_histogramda_draw(GtkWidget *area, cairo_t *cr, int w, int h, gpointer da
* test function
*/
void histogram_update(VideoFrame *vf) {
int i, x, y, min, max, v;
int chan, i, x, y;
if (vf == NULL) return;
if (vf->w <= 0 ) return;
if (hist_minmax == NULL ) {
hist_minmax = (int*) malloc (2 * sizeof(int) * vf->w);
hist_width = vf->w;
}
if (hist_width != vf->w) {
free (hist_minmax);
hist_minmax = (int*) malloc (2 * sizeof(int) * vf->w);
hist_width = vf->w;
}
for (chan = 0; chan < 3; chan++) for (i = 0; i < 256; i++)
histogram[chan][i] = 0;
for (i = 0, x = 0; x < vf->w; x++) {
for (y = 0; y < vf->h; y++) {
v = (vf->data[3*y*vf->w+x + 0] +
vf->data[3*y*vf->w+x + 1] +
vf->data[3*y*vf->w+x + 2]) / 3;
if (y == 0) {
min = v;
max = v;
for (chan = 0; chan < 3; chan++) {
histogram[chan][vf->data[3*(y*vf->w+x) + chan]]++;
}
if (v < min) min = v;
if (v > max) max = v;
}
hist_minmax[i++] = min;
hist_minmax[i++] = max;
}
if (histogram_da)
gdk_window_invalidate_rect(gtk_widget_get_window(histogram_da), NULL, true);
for (histogram_max = 0, chan = 0; chan < 3; chan++) for (i = 0; i < 256; i++)
if (histogram_max < histogram[chan][i]) histogram_max = histogram[chan][i];
};

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