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livetrax/gtk2_ardour/lineset.cc
David Robillard ed626628b5 Delete trailing whitespace
git-svn-id: svn://localhost/ardour2/branches/3.0@9656 d708f5d6-7413-0410-9779-e7cbd77b26cf
2011-06-01 17:00:29 +00:00

804 lines
18 KiB
C++

/*
Copyright (C) 2007 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.
*/
#include "lineset.h"
#include "rgb_macros.h"
#include <libgnomecanvas/libgnomecanvas.h>
#include <libgnomecanvasmm/group.h>
#include <libgnomecanvasmm/canvas.h>
#include <algorithm>
#include <cmath>
#include <iostream>
using namespace std;
namespace Gnome {
namespace Canvas {
LineSetClass LineSet::lineset_class;
//static const char* overlap_error_str = "LineSet error: Line overlap";
LineSet::Line::Line(double c, double w, uint32_t color)
: coord(c)
, width(w)
{
UINT_TO_RGBA (color, &r, &g, &b, &a);
}
/* Constructor for dummy lines that are used only with the coordinate */
LineSet::Line::Line(double c)
: coord(c)
{
}
void
LineSet::Line::set_color(uint32_t color)
{
UINT_TO_RGBA (color, &r, &g, &b, &a);
}
const Glib::Class&
LineSetClass::init()
{
if (!gtype_) {
class_init_func_ = &LineSetClass::class_init_function;
register_derived_type(Item::get_type());
}
return *this;
}
void
LineSetClass::class_init_function(void* /*g_class*/, void* /*class_data*/)
{
}
LineSet::LineSet(Group& parent, Orientation o)
: Glib::ObjectBase("GnomeCanvasLineSet")
, Item(Glib::ConstructParams(lineset_class.init()))
, cached_pos(lines.end())
, orientation(o)
, x1(*this, "x1", 0.0)
, y1(*this, "y1", 0.0)
, x2(*this, "x2", 0.0)
, y2(*this, "y2", 0.0)
, in_update(false)
, update_region1(1.0)
, update_region2(0.0)
, bounds_changed(false)
, covered1(1.0) // covered1 > covered2 ==> nothing's covered
, covered2(0.0)
{
item_construct(parent);
property_x1().signal_changed().connect(sigc::mem_fun(*this, &LineSet::bounds_need_update));
property_y1().signal_changed().connect(sigc::mem_fun(*this, &LineSet::bounds_need_update));
property_x2().signal_changed().connect(sigc::mem_fun(*this, &LineSet::bounds_need_update));
property_y2().signal_changed().connect(sigc::mem_fun(*this, &LineSet::bounds_need_update));
}
LineSet::~LineSet()
{
}
bool
LineSet::line_compare(const Line& a, const Line& b)
{
return a.coord < b.coord;
}
void
LineSet::print_lines()
{
for (Lines::iterator it = lines.begin(); it != lines.end(); ++it) {
cerr << " " << it->coord << " " << it->width << " " << (int)it->r << " " << (int)it->g << " " << (int)it->b << " " << (int)it->a << endl;
}
}
void
LineSet::move_line(double coord, double dest)
{
if (coord == dest) {
return;
}
Lines::iterator it = line_at(coord);
if (it != lines.end()) {
double width = it->width;
it->coord = dest;
Lines::iterator ins = lower_bound(lines.begin(), lines.end(), *it, line_compare);
lines.insert(ins, *it);
lines.erase(it);
if (coord > dest) {
region_needs_update(dest, coord + width);
} else {
region_needs_update(coord, dest + width);
}
}
}
void
LineSet::change_line_width(double coord, double width)
{
Lines::iterator it = line_at(coord);
if (it != lines.end()) {
Line& l = *it;
++it;
if (it != lines.end()) {
if (l.coord + width > it->coord) {
//cerr << overlap_error_str << endl;
return;
}
}
l.width = width;
region_needs_update(coord, coord + width);
}
}
void
LineSet::change_line_color(double coord, uint32_t color)
{
Lines::iterator it = line_at(coord);
if (it != lines.end()) {
it->set_color(color);
region_needs_update(it->coord, it->coord + it->width);
}
}
void
LineSet::add_line(double coord, double width, uint32_t color)
{
Line l(coord, width, color);
Lines::iterator it = std::lower_bound(lines.begin(), lines.end(), l, line_compare);
/* overlap checking */
if (it != lines.end()) {
if (l.coord + l.width > it->coord) {
//cerr << overlap_error_str << endl;
return;
}
}
if (it != lines.begin()) {
--it;
if (l.coord < it->coord + it->width) {
//cerr << overlap_error_str << endl;
return;
}
++it;
}
lines.insert(it, l);
region_needs_update(coord, coord + width);
}
void
LineSet::remove_line(double coord)
{
Lines::iterator it = line_at(coord);
if (it != lines.end()) {
double start = it->coord;
double end = start + it->width;
lines.erase(it);
region_needs_update(start, end);
}
}
void
LineSet::remove_lines(double c1, double c2)
{
if (!lines.empty()) {
region_needs_update(c1, c2);
}
}
void
LineSet::remove_until(double coord)
{
if (!lines.empty()) {
double first = lines.front().coord;
// code
region_needs_update(first, coord);
}
}
void
LineSet::remove_from(double coord)
{
if (!lines.empty()) {
double last = lines.back().coord + lines.back().width;
// code
region_needs_update(coord, last);
}
}
void
LineSet::clear()
{
if (!lines.empty()) {
double coord1 = lines.front().coord;
double coord2 = lines.back().coord + lines.back().width;
lines.clear();
region_needs_update(coord1, coord2);
}
}
/*
* this function is optimized to work faster if we access elements that are adjacent to each other.
* so if a large number of lines are modified, it is wise to modify them in sorted order.
*/
LineSet::Lines::iterator
LineSet::line_at(double coord)
{
if (cached_pos != lines.end()) {
if (coord < cached_pos->coord) {
/* backward search */
while (--cached_pos != lines.end()) {
if (cached_pos->coord <= coord) {
if (cached_pos->coord + cached_pos->width < coord) {
/* coord is between two lines */
return lines.end();
} else {
return cached_pos;
}
}
}
} else {
/* forward search */
while (cached_pos != lines.end()) {
if (cached_pos->coord > coord) {
/* we searched past the line that we want, so now see
if the previous line includes the coordinate */
--cached_pos;
if (cached_pos->coord + cached_pos->width >= coord) {
return cached_pos;
} else {
return lines.end();
}
}
++cached_pos;
}
}
} else {
/* initialize the cached position */
Line dummy(coord);
cached_pos = lower_bound(lines.begin(), lines.end(), dummy, line_compare);
/* The iterator found should point to the element after the one we want. */
--cached_pos;
if (cached_pos != lines.end()) {
if (cached_pos->coord <= coord) {
if (cached_pos->coord + cached_pos->width >= coord) {
return cached_pos;
} else {
return lines.end();
}
} else {
return lines.end();
}
} else {
return lines.end();
}
}
return lines.end();
}
void
LineSet::redraw_request (ArtDRect const & r)
{
int x0, y0, x1, y1;
Canvas& cv = *get_canvas();
//cerr << "redraw request: " << r.x0 << " " << r.y0 << " " << r.x1 << " " << r.y1 << endl;
double fx0 = r.x0;
if (fx0 > INT_MAX) {
fx0 = INT_MAX;
}
double fx1 = r.x1;
if (fx1 > INT_MAX) {
fx1 = INT_MAX;
}
cv.w2c (fx0, r.y0, x0, y0);
cv.w2c (fx1, r.y1, x1, y1);
cv.request_redraw(x0, y0, x1, y1);
}
void
LineSet::update_lines(bool need_redraw)
{
//cerr << "update_lines need_redraw=" << need_redraw << endl;
if (!need_redraw) {
update_region1 = 1.0;
update_region2 = 0.0;
return;
}
if (update_region2 > update_region1) {
ArtDRect redraw;
LineSet::bounds_vfunc(&redraw.x0, &redraw.y0, &redraw.x1, &redraw.y1);
i2w(redraw.x0, redraw.y0);
i2w(redraw.x1, redraw.y1);
if (orientation == Vertical) {
redraw.x1 = redraw.x0 + update_region2;
redraw.x0 += update_region1;
} else {
redraw.y1 = redraw.y0 + update_region2;
redraw.y0 += update_region1;
}
redraw_request(redraw);
update_region1 = 1.0;
update_region2 = 0.0;
}
// if we need to calculate what becomes visible, use some of this
//cv.c2w (0, 0, world_v[X1], world_v[Y1]);
//cv.c2w (cv.get_width(), cv.get_height(), world_v[X2], world_v[Y2]);
}
/*
* return false if a full redraw request has been made.
* return true if nothing or only parts of the rect area has been requested for redraw
*/
bool
LineSet::update_bounds()
{
GnomeCanvasItem* item = GNOME_CANVAS_ITEM(gobj());
ArtDRect old_b;
ArtDRect new_b;
ArtDRect redraw;
Canvas& cv = *get_canvas();
/* store the old bounding box */
old_b.x0 = item->x1;
old_b.y0 = item->y1;
old_b.x1 = item->x2;
old_b.y1 = item->y2;
LineSet::bounds_vfunc(&new_b.x0, &new_b.y0, &new_b.x1, &new_b.y1);
i2w(new_b.x0, new_b.y0);
i2w(new_b.x1, new_b.y1);
item->x1 = new_b.x0;
item->y1 = new_b.y0;
item->x2 = new_b.x1;
item->y2 = new_b.y1;
/* Update bounding box used in rendering function */
double fx0 = new_b.x0;
if (fx0 > INT_MAX) {
fx0 = INT_MAX;
}
double fx1 = new_b.x1;
if (fx1 > INT_MAX) {
fx1 = INT_MAX;
}
cv.w2c (fx0, new_b.y0, bbox.x0, bbox.y0);
cv.w2c (fx1, new_b.y1, bbox.x1, bbox.y1);
/*
* if the first primary axis property (x1 for Vertical, y1 for Horizontal) changed, we must redraw everything,
* because lines are positioned relative to this coordinate. Please excuse the confusion resulting from
* gnome canvas coordinate numbering (1, 2) and libart's (0, 1).
*/
if (orientation == Vertical) {
if (new_b.x0 == old_b.x0) {
/* No need to update everything */
if (new_b.y0 != old_b.y0) {
redraw.x0 = old_b.x0;
redraw.y0 = min(old_b.y0, new_b.y0);
redraw.x1 = old_b.x1;
redraw.y1 = max(old_b.y0, new_b.y0);
redraw_request(redraw);
}
if (new_b.y1 != old_b.y1) {
redraw.x0 = old_b.x0;
redraw.y0 = min(old_b.y1, new_b.y1);
redraw.x1 = old_b.x1;
redraw.y1 = max(old_b.y1, new_b.y1);
redraw_request(redraw);
}
if (new_b.x1 > old_b.x1) {
// we have a larger area ==> possibly more lines
request_lines(old_b.x1, new_b.x1);
redraw.x0 = old_b.x1;
redraw.y0 = min(old_b.y0, new_b.y0);
redraw.x1 = new_b.x1;
redraw.y1 = max(old_b.y1, new_b.y1);
redraw_request(redraw);
} else if (new_b.x1 < old_b.x1) {
remove_lines(new_b.x1, old_b.x1);
redraw.x0 = new_b.x1;
redraw.y0 = min(old_b.y0, new_b.y0);
redraw.x1 = old_b.x1;
redraw.y1 = max(old_b.y1, new_b.y1);
redraw_request(redraw);
}
return true;
} else {
/* update everything */
//cerr << "update everything" << endl;
art_drect_union(&redraw, &old_b, &new_b);
redraw_request(redraw);
return false;
}
} else {
if (new_b.y0 == old_b.y0) {
/* No need to update everything */
if (new_b.x0 != old_b.x0) {
redraw.y0 = old_b.y0;
redraw.x0 = min(old_b.x0, new_b.x0);
redraw.y1 = old_b.y1;
redraw.x1 = max(old_b.x0, new_b.x0);
redraw_request(redraw);
}
if (new_b.x1 != old_b.x1) {
redraw.y0 = old_b.y0;
redraw.x0 = min(old_b.x1, new_b.x1);
redraw.y1 = old_b.y1;
redraw.x1 = max(old_b.x1, new_b.x1);
redraw_request(redraw);
}
if (new_b.y1 > old_b.y1) {
// we have a larger area ==> possibly more lines
request_lines(old_b.y1, new_b.y1);
redraw.y0 = old_b.y1;
redraw.x0 = min(old_b.x0, new_b.x0);
redraw.y1 = new_b.y1;
redraw.x1 = max(old_b.x1, new_b.x1);
redraw_request(redraw);
} else if (new_b.y1 < old_b.y1) {
remove_lines(new_b.y1, old_b.y1);
redraw.y0 = new_b.y1;
redraw.x0 = min(old_b.x0, new_b.x0);
redraw.y1 = old_b.y1;
redraw.x1 = max(old_b.x1, new_b.x1);
redraw_request(redraw);
}
return true;
} else {
/* update everything */
art_drect_union(&redraw, &old_b, &new_b);
redraw_request(redraw);
return false;
}
}
}
/*
* what to do here?
* 1. find out if any line data has been modified since last update.
* N. find out if the item moved. if it moved, the old bbox and the new bbox need to be updated.
*/
void
LineSet::update_vfunc(double* /*affine*/, ArtSVP* /*clip_path*/, int /*flags*/)
{
GnomeCanvasItem* item = GNOME_CANVAS_ITEM(gobj());
bool lines_need_redraw = true;
/*
* need to call gnome_canvas_item_update here, to unset the need_update flag.
* but a call to Gnome::Canvas::Item::update_vfunc results in infinite recursion.
* that function is declared in gnome_canvas.c so no way to call it directly:
* Item::update_vfunc(affine, clip_path, flags);
* So just copy the code from that function. This has to be a bug or
* something I haven't figured out.
*/
GTK_OBJECT_UNSET_FLAGS (item, GNOME_CANVAS_ITEM_NEED_UPDATE);
GTK_OBJECT_UNSET_FLAGS (item, GNOME_CANVAS_ITEM_NEED_AFFINE);
GTK_OBJECT_UNSET_FLAGS (item, GNOME_CANVAS_ITEM_NEED_CLIP);
GTK_OBJECT_UNSET_FLAGS (item, GNOME_CANVAS_ITEM_NEED_VIS);
//cerr << "update {" << endl;
in_update = true;
// ahh. We must update bounds no matter what. If the group position changed,
// there is no way that we are notified of that.
//if (bounds_changed) {
lines_need_redraw = update_bounds();
bounds_changed = false;
//}
update_lines(lines_need_redraw);
in_update = false;
//cerr << "}" << endl;
}
void
LineSet::draw_vfunc(const Glib::RefPtr<Gdk::Drawable>& /*drawable*/, int /*x*/, int /*y*/, int /*width*/, int /*height*/)
{
cerr << "please don't use the GnomeCanvasLineSet item in a non-aa Canvas" << endl;
abort();
}
inline void
LineSet::paint_vert(GnomeCanvasBuf* buf, LineSet::Line& line, int x1, int y1, int x2, int y2)
{
if (line.width == 1.0) {
PAINT_VERTA(buf, line.r, line.g, line.b, line.a, x1, y1, y2);
} else {
PAINT_BOX(buf, line.r, line.g, line.b, line.a, x1, y1, x2, y2);
}
}
inline void
LineSet::paint_horiz(GnomeCanvasBuf* buf, LineSet::Line& line, int x1, int y1, int x2, int y2)
{
if (line.width == 1.0) {
PAINT_HORIZA(buf, line.r, line.g, line.b, line.a, x1, x2, y1);
} else {
PAINT_BOX(buf, line.r, line.g, line.b, line.a, x1, y1, x2, y2);
}
}
void
LineSet::render_vfunc(GnomeCanvasBuf* buf)
{
ArtIRect rect;
int pos0, pos1, offset;
if (buf->is_bg) {
gnome_canvas_buf_ensure_buf (buf);
buf->is_bg = FALSE;
}
/* get the rect that we are rendering to */
art_irect_intersect(&rect, &bbox, &buf->rect);
#if 0
/* DEBUG render bounding box for this region. should result in the full
bounding box when all rendering regions are finished */
PAINT_BOX(buf, 0xaa, 0xaa, 0xff, 0xbb, rect.x0, rect.y0, rect.x1, rect.y1);
#endif
#if 0
/* harlequin debugging, shows the rect that is actually drawn, distinct from
rects from other render cycles */
gint r, g, b, a;
r = random() % 0xff;
g = random() % 0xff;
b = random() % 0xff;
PAINT_BOX(buf, r, g, b, 0x33, rect.x0, rect.y0, rect.x1, rect.y1);
#endif
if (lines.empty()) {
return;
}
Lines::iterator it = lines.begin();
Lines::iterator end = --lines.end();
/**
* The first and the last line in this render have to be handled separately from those in between, because those lines
* may be cut off at the ends.
*/
if (orientation == Vertical) {
offset = bbox.x0;
// skip parts of lines that are to the right of the buffer, and paint the last line visible
for (; end != lines.end(); --end) {
pos0 = ((int) floor(end->coord)) + offset;
if (pos0 < rect.x1) {
pos1 = min((pos0 + (int) floor(end->width)), rect.x1);
if (pos0 < rect.x0 && pos1 < rect.x0) {
return;
}
paint_vert(buf, *end, pos0, rect.y0, pos1, rect.y1);
break;
}
}
if (end == lines.end()) {
return;
}
// skip parts of lines that are to the left of the buffer
for (; it != end; ++it) {
pos0 = ((int) floor(it->coord)) + offset;
pos1 = pos0 + ((int) floor(it->width));
if (pos1 > rect.x0) {
pos0 = max(pos0, rect.x0);
paint_vert(buf, *it, pos0, rect.y0, pos1, rect.y1);
++it;
break;
}
}
// render what's between the first and last lines
for (; it != end; ++it) {
pos0 = ((int) floor(it->coord)) + offset;
pos1 = pos0 + ((int) floor(it->width));
paint_vert(buf, *it, pos0, rect.y0, pos1, rect.y1);
}
} else {
offset = bbox.y0;
// skip parts of lines that are to the right of the buffer, and paint the last line visible
for (; end != lines.end(); --end) {
pos0 = ((int) floor(end->coord)) + offset;
if (pos0 < rect.y1) {
pos1 = min((pos0 + (int) floor(end->width)), rect.y1);
if (pos0 < rect.y0 && pos1 < rect.y0) {
return;
}
paint_horiz(buf, *end, rect.x0, pos0, rect.x1, pos1);
break;
}
}
if (end == lines.end()) {
return;
}
// skip parts of lines that are to the left of the buffer
for (; it != end; ++it) {
pos0 = ((int) floor(it->coord)) + offset;
pos1 = pos0 + ((int) floor(it->width));
if (pos1 > rect.y0) {
pos0 = max(pos0, rect.y0);
paint_horiz(buf, *it, rect.x0, pos0, rect.x1, pos1);
++it;
break;
}
}
// render what's between the first and last lines
for (; it != end; ++it) {
pos0 = ((int) floor(it->coord)) + offset;
pos1 = pos0 + ((int) floor(it->width));
paint_horiz(buf, *it, rect.x0, pos0, rect.x1, pos1);
}
}
}
void
LineSet::bounds_vfunc(double* _x1, double* _y1, double* _x2, double* _y2)
{
*_x1 = x1;
*_y1 = y1;
*_x2 = x2 + 1;
*_y2 = y2 + 1;
}
double
LineSet::point_vfunc(double x, double y, int /*cx*/, int /*cy*/, GnomeCanvasItem** actual_item)
{
double x1, y1, x2, y2;
double dx, dy;
LineSet::bounds_vfunc(&x1, &y1, &x2, &y2);
*actual_item = gobj();
if (x < x1) {
dx = x1 - x;
} else if (x > x2) {
dx = x - x2;
} else {
dx = 0.0;
}
if (y < y1) {
dy = y1 - y;
} else if (y > y2) {
dy = y - y2;
} else {
if (dx == 0.0) {
// point is inside
return 0.0;
} else {
dy = 0.0;
}
}
return sqrt (dx * dx + dy * dy);
}
/* If not overrided emit the signal */
void
LineSet::request_lines(double c1, double c2)
{
signal_request_lines(*this, c1, c2);
}
void
LineSet::bounds_need_update()
{
bounds_changed = true;
if (!in_update) {
request_update();
}
}
void
LineSet::region_needs_update(double coord1, double coord2)
{
if (update_region1 > update_region2) {
update_region1 = coord1;
update_region2 = coord2;
} else {
update_region1 = min(update_region1, coord1);
update_region2 = max(update_region2, coord2);
}
if (!in_update) {
request_update();
}
}
/*
* These have been defined to avoid endless recursion with gnomecanvasmm.
* Don't know why this happens
*/
bool LineSet::on_event(GdkEvent* /*p1*/)
{
return false;
}
void LineSet::realize_vfunc() { }
void LineSet::unrealize_vfunc() { }
void LineSet::map_vfunc() { }
void LineSet::unmap_vfunc() { }
} /* namespace Canvas */
} /* namespace Gnome */