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-rw-r--r--plugins/eg-sampler.lv2/sampler_ui.c393
1 files changed, 393 insertions, 0 deletions
diff --git a/plugins/eg-sampler.lv2/sampler_ui.c b/plugins/eg-sampler.lv2/sampler_ui.c
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+++ b/plugins/eg-sampler.lv2/sampler_ui.c
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+/*
+ LV2 Sampler Example Plugin UI
+ Copyright 2011-2016 David Robillard <d@drobilla.net>
+
+ Permission to use, copy, modify, and/or distribute this software for any
+ purpose with or without fee is hereby granted, provided that the above
+ copyright notice and this permission notice appear in all copies.
+
+ THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#include "peaks.h"
+#include "uris.h"
+
+#include "lv2/atom/atom.h"
+#include "lv2/atom/forge.h"
+#include "lv2/atom/util.h"
+#include "lv2/core/lv2.h"
+#include "lv2/core/lv2_util.h"
+#include "lv2/log/log.h"
+#include "lv2/log/logger.h"
+#include "lv2/midi/midi.h"
+#include "lv2/ui/ui.h"
+#include "lv2/urid/urid.h"
+
+#include <cairo.h>
+#include <gdk/gdk.h>
+#include <glib-object.h>
+#include <glib.h>
+#include <gobject/gclosure.h>
+#include <gtk/gtk.h>
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define SAMPLER_UI_URI "http://lv2plug.in/plugins/eg-sampler#ui"
+
+#define MIN_CANVAS_W 128
+#define MIN_CANVAS_H 80
+
+typedef struct {
+ LV2_Atom_Forge forge;
+ LV2_URID_Map* map;
+ LV2_Log_Logger logger;
+ SamplerURIs uris;
+ PeaksReceiver precv;
+
+ LV2UI_Write_Function write;
+ LV2UI_Controller controller;
+
+ GtkWidget* box;
+ GtkWidget* play_button;
+ GtkWidget* file_button;
+ GtkWidget* button_box;
+ GtkWidget* canvas;
+ GtkWidget* window; /* For optional show interface. */
+
+ uint32_t width;
+ uint32_t requested_n_peaks;
+ char* filename;
+
+ uint8_t forge_buf[1024];
+} SamplerUI;
+
+static void
+on_file_set(GtkFileChooserButton* widget, void* handle)
+{
+ SamplerUI* ui = (SamplerUI*)handle;
+
+ // Get the filename from the file chooser
+ char* filename = gtk_file_chooser_get_filename(GTK_FILE_CHOOSER(widget));
+
+ // Write a set message to the plugin to load new file
+ lv2_atom_forge_set_buffer(&ui->forge, ui->forge_buf, sizeof(ui->forge_buf));
+ LV2_Atom* msg = (LV2_Atom*)write_set_file(&ui->forge, &ui->uris,
+ filename, strlen(filename));
+
+ ui->write(ui->controller, 0, lv2_atom_total_size(msg),
+ ui->uris.atom_eventTransfer,
+ msg);
+
+ g_free(filename);
+}
+
+static void
+on_play_clicked(GtkFileChooserButton* widget, void* handle)
+{
+ SamplerUI* ui = (SamplerUI*)handle;
+ struct {
+ LV2_Atom atom;
+ uint8_t msg[3];
+ } note_on;
+
+ note_on.atom.type = ui->uris.midi_Event;
+ note_on.atom.size = 3;
+ note_on.msg[0] = LV2_MIDI_MSG_NOTE_ON;
+ note_on.msg[1] = 60;
+ note_on.msg[2] = 60;
+ ui->write(ui->controller, 0, sizeof(note_on),
+ ui->uris.atom_eventTransfer,
+ &note_on);
+}
+
+static void
+request_peaks(SamplerUI* ui, uint32_t n_peaks)
+{
+ if (n_peaks == ui->requested_n_peaks) {
+ return;
+ }
+
+ lv2_atom_forge_set_buffer(&ui->forge, ui->forge_buf, sizeof(ui->forge_buf));
+
+ LV2_Atom_Forge_Frame frame;
+ lv2_atom_forge_object(&ui->forge, &frame, 0, ui->uris.patch_Get);
+ lv2_atom_forge_key(&ui->forge, ui->uris.patch_accept);
+ lv2_atom_forge_urid(&ui->forge, ui->precv.uris.peaks_PeakUpdate);
+ lv2_atom_forge_key(&ui->forge, ui->precv.uris.peaks_total);
+ lv2_atom_forge_int(&ui->forge, n_peaks);
+ lv2_atom_forge_pop(&ui->forge, &frame);
+
+ LV2_Atom* msg = lv2_atom_forge_deref(&ui->forge, frame.ref);
+ ui->write(ui->controller, 0, lv2_atom_total_size(msg),
+ ui->uris.atom_eventTransfer,
+ msg);
+
+ ui->requested_n_peaks = n_peaks;
+}
+
+/** Set Cairo color to a GDK color (to follow Gtk theme). */
+static void
+cairo_set_source_gdk(cairo_t* cr, const GdkColor* color)
+{
+ cairo_set_source_rgb(
+ cr, color->red / 65535.0, color->green / 65535.0, color->blue / 65535.0);
+
+}
+
+static gboolean
+on_canvas_expose(GtkWidget* widget, GdkEventExpose* event, gpointer data)
+{
+ SamplerUI* ui = (SamplerUI*)data;
+
+ GtkAllocation size;
+ gtk_widget_get_allocation(widget, &size);
+
+ ui->width = size.width;
+ if ((uint32_t)ui->width > 2 * ui->requested_n_peaks) {
+ request_peaks(ui, 2 * ui->requested_n_peaks);
+ }
+
+ cairo_t* cr = gdk_cairo_create(gtk_widget_get_window(widget));
+
+ cairo_set_line_width(cr, 1.0);
+ cairo_translate(cr, 0.5, 0.5);
+
+ const int mid_y = size.height / 2;
+
+ const float* const peaks = ui->precv.peaks;
+ const int32_t n_peaks = ui->precv.n_peaks;
+ if (peaks) {
+ // Draw waveform
+ const double scale = size.width / ((double)n_peaks - 1.0f);
+
+ // Start at left origin
+ cairo_move_to(cr, 0, mid_y);
+
+ // Draw line through top peaks
+ for (int i = 0; i < n_peaks; ++i) {
+ const float peak = peaks[i];
+ cairo_line_to(cr, i * scale, mid_y + (peak / 2.0f) * size.height);
+ }
+
+ // Continue through bottom peaks
+ for (int i = n_peaks - 1; i >= 0; --i) {
+ const float peak = peaks[i];
+ cairo_line_to(cr, i * scale, mid_y - (peak / 2.0f) * size.height);
+ }
+
+ // Close shape
+ cairo_line_to(cr, 0, mid_y);
+
+ cairo_set_source_gdk(cr, widget->style->mid);
+ cairo_fill_preserve(cr);
+
+ cairo_set_source_gdk(cr, widget->style->fg);
+ cairo_stroke(cr);
+ }
+
+ cairo_destroy(cr);
+ return TRUE;
+}
+
+static LV2UI_Handle
+instantiate(const LV2UI_Descriptor* descriptor,
+ const char* plugin_uri,
+ const char* bundle_path,
+ LV2UI_Write_Function write_function,
+ LV2UI_Controller controller,
+ LV2UI_Widget* widget,
+ const LV2_Feature* const* features)
+{
+ SamplerUI* ui = (SamplerUI*)calloc(1, sizeof(SamplerUI));
+ if (!ui) {
+ return NULL;
+ }
+
+ ui->write = write_function;
+ ui->controller = controller;
+ ui->width = MIN_CANVAS_W;
+ *widget = NULL;
+
+ // Get host features
+ const char* missing = lv2_features_query(
+ features,
+ LV2_LOG__log, &ui->logger.log, false,
+ LV2_URID__map, &ui->map, true,
+ NULL);
+ lv2_log_logger_set_map(&ui->logger, ui->map);
+ if (missing) {
+ lv2_log_error(&ui->logger, "Missing feature <%s>\n", missing);
+ free(ui);
+ return NULL;
+ }
+
+ // Map URIs and initialise forge
+ map_sampler_uris(ui->map, &ui->uris);
+ lv2_atom_forge_init(&ui->forge, ui->map);
+ peaks_receiver_init(&ui->precv, ui->map);
+
+ // Construct Gtk UI
+ ui->box = gtk_vbox_new(FALSE, 4);
+ ui->play_button = gtk_button_new_with_label("▶");
+ ui->canvas = gtk_drawing_area_new();
+ ui->button_box = gtk_hbox_new(FALSE, 4);
+ ui->file_button = gtk_file_chooser_button_new(
+ "Load Sample", GTK_FILE_CHOOSER_ACTION_OPEN);
+ gtk_widget_set_size_request(ui->canvas, MIN_CANVAS_W, MIN_CANVAS_H);
+ gtk_container_set_border_width(GTK_CONTAINER(ui->box), 4);
+ gtk_box_pack_start(GTK_BOX(ui->box), ui->canvas, TRUE, TRUE, 0);
+ gtk_box_pack_start(GTK_BOX(ui->box), ui->button_box, FALSE, TRUE, 0);
+ gtk_box_pack_start(GTK_BOX(ui->button_box), ui->play_button, FALSE, FALSE, 0);
+ gtk_box_pack_start(GTK_BOX(ui->button_box), ui->file_button, TRUE, TRUE, 0);
+
+ g_signal_connect(ui->file_button, "file-set",
+ G_CALLBACK(on_file_set), ui);
+
+ g_signal_connect(ui->play_button, "clicked",
+ G_CALLBACK(on_play_clicked), ui);
+
+ g_signal_connect(G_OBJECT(ui->canvas), "expose_event",
+ G_CALLBACK(on_canvas_expose), ui);
+
+ // Request state (filename) from plugin
+ lv2_atom_forge_set_buffer(&ui->forge, ui->forge_buf, sizeof(ui->forge_buf));
+ LV2_Atom_Forge_Frame frame;
+ LV2_Atom* msg = (LV2_Atom*)lv2_atom_forge_object(
+ &ui->forge, &frame, 0, ui->uris.patch_Get);
+ lv2_atom_forge_pop(&ui->forge, &frame);
+
+ ui->write(ui->controller, 0, lv2_atom_total_size(msg),
+ ui->uris.atom_eventTransfer,
+ msg);
+
+ *widget = ui->box;
+
+ return ui;
+}
+
+static void
+cleanup(LV2UI_Handle handle)
+{
+ SamplerUI* ui = (SamplerUI*)handle;
+ gtk_widget_destroy(ui->box);
+ gtk_widget_destroy(ui->play_button);
+ gtk_widget_destroy(ui->canvas);
+ gtk_widget_destroy(ui->button_box);
+ gtk_widget_destroy(ui->file_button);
+ free(ui);
+}
+
+static void
+port_event(LV2UI_Handle handle,
+ uint32_t port_index,
+ uint32_t buffer_size,
+ uint32_t format,
+ const void* buffer)
+{
+ SamplerUI* ui = (SamplerUI*)handle;
+ if (format == ui->uris.atom_eventTransfer) {
+ const LV2_Atom* atom = (const LV2_Atom*)buffer;
+ if (lv2_atom_forge_is_object_type(&ui->forge, atom->type)) {
+ const LV2_Atom_Object* obj = (const LV2_Atom_Object*)atom;
+ if (obj->body.otype == ui->uris.patch_Set) {
+ const char* path = read_set_file(&ui->uris, obj);
+ if (path && (!ui->filename || strcmp(path, ui->filename))) {
+ g_free(ui->filename);
+ ui->filename = g_strdup(path);
+ gtk_file_chooser_set_filename(
+ GTK_FILE_CHOOSER(ui->file_button), path);
+ peaks_receiver_clear(&ui->precv);
+ ui->requested_n_peaks = 0;
+ request_peaks(ui, ui->width / 2 * 2);
+ } else if (!path) {
+ lv2_log_warning(&ui->logger, "Set message has no path\n");
+ }
+ } else if (obj->body.otype == ui->precv.uris.peaks_PeakUpdate) {
+ if (!peaks_receiver_receive(&ui->precv, obj)) {
+ gtk_widget_queue_draw(ui->canvas);
+ }
+ }
+ } else {
+ lv2_log_error(&ui->logger, "Unknown message type\n");
+ }
+ } else {
+ lv2_log_warning(&ui->logger, "Unknown port event format\n");
+ }
+}
+
+/* Optional non-embedded UI show interface. */
+static int
+ui_show(LV2UI_Handle handle)
+{
+ SamplerUI* ui = (SamplerUI*)handle;
+
+ int argc = 0;
+ gtk_init(&argc, NULL);
+
+ ui->window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
+ gtk_container_add(GTK_CONTAINER(ui->window), ui->box);
+ gtk_widget_show_all(ui->window);
+ gtk_window_present(GTK_WINDOW(ui->window));
+
+ return 0;
+}
+
+/* Optional non-embedded UI hide interface. */
+static int
+ui_hide(LV2UI_Handle handle)
+{
+ return 0;
+}
+
+/* Idle interface for optional non-embedded UI. */
+static int
+ui_idle(LV2UI_Handle handle)
+{
+ SamplerUI* ui = (SamplerUI*)handle;
+ if (ui->window) {
+ gtk_main_iteration();
+ }
+ return 0;
+}
+
+static const void*
+extension_data(const char* uri)
+{
+ static const LV2UI_Show_Interface show = { ui_show, ui_hide };
+ static const LV2UI_Idle_Interface idle = { ui_idle };
+ if (!strcmp(uri, LV2_UI__showInterface)) {
+ return &show;
+ } else if (!strcmp(uri, LV2_UI__idleInterface)) {
+ return &idle;
+ }
+ return NULL;
+}
+
+static const LV2UI_Descriptor descriptor = {
+ SAMPLER_UI_URI,
+ instantiate,
+ cleanup,
+ port_event,
+ extension_data
+};
+
+LV2_SYMBOL_EXPORT
+const LV2UI_Descriptor*
+lv2ui_descriptor(uint32_t index)
+{
+ switch (index) {
+ case 0:
+ return &descriptor;
+ default:
+ return NULL;
+ }
+}
generated by cgit v1.2.1 (git 2.18.0) at 2024-11-18 04:49:55 +0000