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livetrax/libs/gtkmm2ext/fastmeter.cc

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/*
Copyright (C) 2003-2006 Paul Davis
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., 675 Mass Ave, Cambridge, MA 02139, USA.
$Id$
*/
#include <iostream>
#include <cmath>
#include <algorithm>
#include <gdkmm/rectangle.h>
#include <gtkmm2ext/fastmeter.h>
#include <gtkmm2ext/utils.h>
#include <gtkmm/style.h>
#include <string.h>
using namespace Gtk;
using namespace Gdk;
using namespace Glib;
using namespace Gtkmm2ext;
using namespace std;
int FastMeter::min_v_pixbuf_size = 50;
int FastMeter::max_v_pixbuf_size = 1024;
Glib::RefPtr<Gdk::Pixbuf>* FastMeter::v_pixbuf_cache = 0;
int FastMeter::min_h_pixbuf_size = 50;
int FastMeter::max_h_pixbuf_size = 1024;
Glib::RefPtr<Gdk::Pixbuf>* FastMeter::h_pixbuf_cache = 0;
FastMeter::FastMeter (long hold, unsigned long dimen, Orientation o)
{
orientation = o;
hold_cnt = hold;
hold_state = 0;
current_peak = 0;
current_level = 0;
current_user_level = -100.0f;
set_events (BUTTON_PRESS_MASK|BUTTON_RELEASE_MASK);
pixrect.x = 0;
pixrect.y = 0;
if (orientation == Vertical) {
pixbuf = request_vertical_meter(dimen, 250);
} else {
pixbuf = request_horizontal_meter(186, dimen);
}
pixheight = pixbuf->get_height();
pixwidth = pixbuf->get_width();
if (orientation == Vertical) {
pixrect.width = min (pixwidth, (gint) dimen);
pixrect.height = pixheight;
} else {
pixrect.width = pixwidth;
pixrect.height = min (pixheight, (gint) dimen);
}
request_width = pixrect.width;
request_height= pixrect.height;
}
Glib::RefPtr<Gdk::Pixbuf> FastMeter::request_vertical_meter(int width, int height)
{
if (height < min_v_pixbuf_size)
height = min_v_pixbuf_size;
if (height > max_v_pixbuf_size)
height = max_v_pixbuf_size;
int index = height - 1;
if (v_pixbuf_cache == 0) {
v_pixbuf_cache = (Glib::RefPtr<Gdk::Pixbuf>*) malloc(sizeof(Glib::RefPtr<Gdk::Pixbuf>) * max_v_pixbuf_size);
memset(v_pixbuf_cache,0,sizeof(Glib::RefPtr<Gdk::Pixbuf>) * max_v_pixbuf_size);
}
Glib::RefPtr<Gdk::Pixbuf> ret = v_pixbuf_cache[index];
if (ret)
return ret;
guint8* data;
data = (guint8*) malloc(width*height * 3);
guint8 r,g,b;
r=0;
g=255;
b=0;
// fake log calculation copied from log_meter.h
// actual calculation:
// log_meter(0.0f) =
// def = (0.0f + 20.0f) * 2.5f + 50f
// return def / 115.0f
int knee = (int)floor((float)height * 100.0f / 115.0f);
int y;
for (y = 0; y < knee / 2; y++) {
r = (guint8)floor(255.0 * (float)y/(float)(knee / 2));
for (int x = 0; x < width; x++) {
data[ (x+(height-y-1)*width) * 3 + 0 ] = r;
data[ (x+(height-y-1)*width) * 3 + 1 ] = g;
data[ (x+(height-y-1)*width) * 3 + 2 ] = b;
}
}
for (; y < knee; y++) {
g = 255 - (guint8)floor(170.0 * (float)(y - knee/ 2)/(float)(knee / 2));
for (int x = 0; x < width; x++) {
data[ (x+(height-y-1)*width) * 3 + 0 ] = r;
data[ (x+(height-y-1)*width) * 3 + 1 ] = g;
data[ (x+(height-y-1)*width) * 3 + 2 ] = b;
}
}
r=255;
g=0;
b=0;
for (; y < height; y++) {
for (int x = 0; x < width; x++) {
data[ (x+(height-y-1)*width) * 3 + 0 ] = r;
data[ (x+(height-y-1)*width) * 3 + 1 ] = g;
data[ (x+(height-y-1)*width) * 3 + 2 ] = b;
}
}
ret = Pixbuf::create_from_data(data, COLORSPACE_RGB, false, 8, width, height, width * 3);
v_pixbuf_cache[index] = ret;
return ret;
}
Glib::RefPtr<Gdk::Pixbuf> FastMeter::request_horizontal_meter(int width, int height)
{
if (width < min_h_pixbuf_size)
width = min_h_pixbuf_size;
if (width > max_h_pixbuf_size)
width = max_h_pixbuf_size;
int index = width - 1;
if (h_pixbuf_cache == 0) {
h_pixbuf_cache = (Glib::RefPtr<Gdk::Pixbuf>*) malloc(sizeof(Glib::RefPtr<Gdk::Pixbuf>) * max_h_pixbuf_size);
memset(h_pixbuf_cache,0,sizeof(Glib::RefPtr<Gdk::Pixbuf>) * max_h_pixbuf_size);
}
Glib::RefPtr<Gdk::Pixbuf> ret = h_pixbuf_cache[index];
if (ret)
return ret;
guint8* data;
data = (guint8*) malloc(width*height * 3);
guint8 r,g,b;
r=0;
g=255;
b=0;
// fake log calculation copied from log_meter.h
// actual calculation:
// log_meter(0.0f) =
// def = (0.0f + 20.0f) * 2.5f + 50f
// return def / 115.0f
int knee = (int)floor((float)width * 100.0f / 115.0f);
int x;
for (x = 0; x < knee / 2; x++) {
r = (guint8)floor(255.0 * (float)x/(float)(knee / 2));
for (int y = 0; y < height; y++) {
data[ (x+(height-y-1)*width) * 3 + 0 ] = r;
data[ (x+(height-y-1)*width) * 3 + 1 ] = g;
data[ (x+(height-y-1)*width) * 3 + 2 ] = b;
}
}
for (; x < knee; x++) {
g = 255 - (guint8)floor(170.0 * (float)(x - knee/ 2)/(float)(knee / 2));
for (int y = 0; y < height; y++) {
data[ (x+(height-y-1)*width) * 3 + 0 ] = r;
data[ (x+(height-y-1)*width) * 3 + 1 ] = g;
data[ (x+(height-y-1)*width) * 3 + 2 ] = b;
}
}
r=255;
g=0;
b=0;
for (; x < width; x++) {
for (int y = 0; y < height; y++) {
data[ (x+(height-y-1)*width) * 3 + 0 ] = r;
data[ (x+(height-y-1)*width) * 3 + 1 ] = g;
data[ (x+(height-y-1)*width) * 3 + 2 ] = b;
}
}
ret = Pixbuf::create_from_data(data, COLORSPACE_RGB, false, 8, width, height, width * 3);
h_pixbuf_cache[index] = ret;
return ret;
}
FastMeter::~FastMeter ()
{
}
void
FastMeter::set_hold_count (long val)
{
if (val < 1) {
val = 1;
}
hold_cnt = val;
hold_state = 0;
current_peak = 0;
queue_draw ();
}
void
FastMeter::on_size_request (GtkRequisition* req)
{
if (orientation == Vertical) {
req->height = request_height;
req->height = max(req->height, min_v_pixbuf_size);
req->height = min(req->height, max_v_pixbuf_size);
req->width = request_width;
} else {
req->width = request_width;
req->width = max(req->width, min_h_pixbuf_size);
req->width = min(req->width, max_h_pixbuf_size);
req->height = request_height;
}
}
void
FastMeter::on_size_allocate (Gtk::Allocation &alloc)
{
if (orientation == Vertical) {
if (alloc.get_width() != request_width) {
alloc.set_width (request_width);
}
int h = alloc.get_height();
h = max(h, min_v_pixbuf_size);
h = min(h, max_v_pixbuf_size);
if ( h != alloc.get_height())
alloc.set_height(h);
if (pixheight != h) {
pixbuf = request_vertical_meter(request_width, h);
}
} else {
if (alloc.get_height() != request_height) {
alloc.set_height(request_height);
}
int w = alloc.get_width();
w = max(w, min_h_pixbuf_size);
w = min(w, max_h_pixbuf_size);
if ( w != alloc.get_width())
alloc.set_width(w);
if (pixwidth != w) {
pixbuf = request_horizontal_meter(w, request_height);
}
}
pixheight = pixbuf->get_height();
pixwidth = pixbuf->get_width();
DrawingArea::on_size_allocate(alloc);
}
bool
FastMeter::on_expose_event (GdkEventExpose* ev)
{
if (orientation == Vertical) {
return vertical_expose (ev);
} else {
return horizontal_expose (ev);
}
}
bool
FastMeter::vertical_expose (GdkEventExpose* ev)
{
gint top_of_meter;
GdkRectangle intersection;
GdkRectangle background;
top_of_meter = (gint) floor (pixheight * current_level);
pixrect.height = top_of_meter;
background.x = 0;
background.y = 0;
background.width = pixrect.width;
background.height = pixheight - top_of_meter;
if (gdk_rectangle_intersect (&background, &ev->area, &intersection)) {
get_window()->draw_rectangle (get_style()->get_black_gc(), true,
intersection.x, intersection.y,
intersection.width, intersection.height);
}
if (gdk_rectangle_intersect (&pixrect, &ev->area, &intersection)) {
// draw the part of the meter image that we need. the area we draw is bounded "in reverse" (top->bottom)
get_window()->draw_pixbuf(get_style()->get_fg_gc(get_state()), pixbuf,
intersection.x, pixheight - top_of_meter,
intersection.x, pixheight - top_of_meter,
intersection.width, intersection.height,
Gdk::RGB_DITHER_NONE, 0, 0);
}
// draw peak bar
if (hold_state && intersection.width > 0) {
gint y = pixheight - (gint) floor (pixheight * current_peak);
int h = min(3, pixheight - y);
get_window()->draw_pixbuf (get_style()->get_fg_gc(get_state()), pixbuf,
intersection.x, y,
intersection.x, y,
intersection.width, h,
Gdk::RGB_DITHER_NONE, 0, 0);
}
return TRUE;
}
bool
FastMeter::horizontal_expose (GdkEventExpose* ev)
{
gint right_of_meter;
GdkRectangle intersection;
GdkRectangle background;
right_of_meter = (gint) floor (pixwidth * current_level);
pixrect.width = right_of_meter;
background.x = 0;
background.y = 0;
background.width = pixwidth - right_of_meter;
background.height = pixrect.height;
if (gdk_rectangle_intersect (&background, &ev->area, &intersection)) {
get_window()->draw_rectangle (get_style()->get_black_gc(), true,
intersection.x + right_of_meter, intersection.y,
intersection.width, intersection.height);
}
if (gdk_rectangle_intersect (&pixrect, &ev->area, &intersection)) {
// draw the part of the meter image that we need. the area we draw is bounded "in reverse" (top->bottom)
get_window()->draw_pixbuf(get_style()->get_fg_gc(get_state()), pixbuf,
intersection.x, intersection.y,
intersection.x, intersection.y,
intersection.width, intersection.height,
Gdk::RGB_DITHER_NONE, 0, 0);
}
// draw peak bar
// XXX: peaks don't work properly
/*
if (hold_state && intersection.height > 0) {
gint x = (gint) floor(pixwidth * current_peak);
get_window()->draw_pixbuf (get_style()->get_fg_gc(get_state()), pixbuf,
x, intersection.y,
x, intersection.y,
3, intersection.height,
Gdk::RGB_DITHER_NONE, 0, 0);
}
*/
return true;
}
void
FastMeter::set (float lvl, float usrlvl)
{
current_level = lvl;
current_user_level = usrlvl;
if (lvl > current_peak) {
current_peak = lvl;
hold_state = hold_cnt;
}
if (hold_state > 0) {
if (--hold_state == 0) {
current_peak = lvl;
}
}
queue_draw ();
}
void
FastMeter::clear ()
{
current_level = 0;
current_peak = 0;
hold_state = 0;
queue_draw ();
}