ardour/gtk2_ardour/plugin_display.cc

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/*
* Copyright (C) 2017 Johannes Mueller <github@johannes-mueller.org>
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <gtkmm/container.h>
#include "gtkmm2ext/colors.h"
#include "gtkmm2ext/gtk_ui.h"
#include "gtkmm2ext/gui_thread.h"
#include "gtkmm2ext/utils.h"
#include "ui_config.h"
#include "plugin_display.h"
PluginDisplay::PluginDisplay (boost::shared_ptr<ARDOUR::Plugin> p, uint32_t max_height)
: _plug (p)
, _surf (0)
, _max_height (max_height)
, _cur_height (1)
, _scroll (false)
{
add_events (Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON_RELEASE_MASK);
_plug->DropReferences.connect (_death_connection, invalidator (*this), boost::bind (&PluginDisplay::plugin_going_away, this), gui_context());
_plug->QueueDraw.connect (_qdraw_connection, invalidator (*this),
boost::bind (&Gtk::Widget::queue_draw, this), gui_context ());
}
PluginDisplay::~PluginDisplay ()
{
if (_surf) {
cairo_surface_destroy (_surf);
}
}
bool
PluginDisplay::on_button_press_event (GdkEventButton *ev)
{
return false;
}
bool
PluginDisplay::on_button_release_event (GdkEventButton *ev)
{
return false;
}
void
PluginDisplay::on_size_request (Gtk::Requisition* req)
{
req->width = 300;
req->height = _cur_height;
}
void
PluginDisplay::update_height_alloc (uint32_t height)
{
uint32_t shm = std::min (_max_height, height);
if (shm != _cur_height) {
_cur_height = shm;
queue_resize ();
}
}
uint32_t
PluginDisplay::render_inline (cairo_t* cr, uint32_t width)
{
ARDOUR::Plugin::Display_Image_Surface* dis = _plug->render_inline_display (width, _max_height);
if (!dis) {
return 0;
}
/* allocate a local image-surface,
* We cannot re-use the data via cairo_image_surface_create_for_data(),
* since pixman keeps a reference to it.
* we'd need to hand over the data and ha cairo_surface_destroy to free it.
* it might be possible to work around via cairo_surface_set_user_data().
*/
if (!_surf
|| dis->width != cairo_image_surface_get_width (_surf)
|| dis->height != cairo_image_surface_get_height (_surf)
) {
if (_surf) {
cairo_surface_destroy (_surf);
}
_surf = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, dis->width, dis->height);
}
if (cairo_image_surface_get_stride (_surf) == dis->stride) {
memcpy (cairo_image_surface_get_data (_surf), dis->data, dis->stride * dis->height);
} else {
unsigned char *src = dis->data;
unsigned char *dst = cairo_image_surface_get_data (_surf);
const int dst_stride = cairo_image_surface_get_stride (_surf);
for (int y = 0; y < dis->height; ++y) {
memcpy (dst, src, dis->width * 4 /*ARGB32*/);
src += dis->stride;
dst += dst_stride;
}
}
cairo_surface_flush(_surf);
cairo_surface_mark_dirty(_surf);
const double xc = floor ((width - dis->width) * .5);
cairo_set_source_surface(cr, _surf, xc, 0);
cairo_paint (cr);
return dis->height;
}
bool
PluginDisplay::on_expose_event (GdkEventExpose* ev)
{
Gtk::Allocation a = get_allocation();
double const width = a.get_width();
double const height = a.get_height();
cairo_t* cr = gdk_cairo_create (get_window()->gobj());
cairo_rectangle (cr, ev->area.x, ev->area.y, ev->area.width, ev->area.height);
cairo_clip (cr);
Gdk::Color const bg = get_style()->get_bg (Gtk::STATE_NORMAL);
cairo_set_source_rgb (cr, bg.get_red_p (), bg.get_green_p (), bg.get_blue_p ());
cairo_rectangle (cr, 0, 0, width, height);
cairo_fill (cr);
cairo_save (cr);
cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
display_frame(cr, width, height);
cairo_clip (cr);
cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
uint32_t ht = render_inline (cr, width);
cairo_restore (cr);
if (ht == 0) {
hide ();
if (_cur_height != 1) {
_cur_height = 1;
queue_resize ();
}
cairo_destroy (cr);
return true;
} else {
update_height_alloc (ht);
}
bool failed = false;
std::string name = get_name();
Gtkmm2ext::Color fill_color = UIConfiguration::instance().color (string_compose ("%1: fill active", name), &failed);
display_frame(cr, width, height);
cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
cairo_set_line_width(cr, 1.0);
if (failed) {
cairo_set_source_rgba (cr, .75, .75, .75, 1.0);
} else {
Gtkmm2ext::set_source_rgb_a (cr, fill_color, 1.0);
}
cairo_stroke (cr);
cairo_destroy(cr);
return true;
}
void
PluginDisplay::display_frame (cairo_t* cr, double w, double h)
{
cairo_rectangle (cr, 0.0, 0.0, w, h);
}