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285 lines
8.5 KiB
Vala
285 lines
8.5 KiB
Vala
/* spek-spectrogram.vala
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*
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* Copyright (C) 2010 Alexander Kojevnikov <alexander@kojevnikov.com>
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*
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* Spek is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Spek is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Spek. If not, see <http://www.gnu.org/licenses/>.
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*/
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using Cairo;
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using Gdk;
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using Gtk;
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using Pango;
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namespace Spek {
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class Spectrogram : DrawingArea {
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public string file_name { get; private set; }
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private Pipeline pipeline;
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private string info;
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private const int THRESHOLD = -92;
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private const int NFFT = 2048;
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private const int BANDS = NFFT / 2 + 1;
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private ImageSurface image;
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private ImageSurface palette;
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private const int LPAD = 60;
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private const int TPAD = 60;
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private const int RPAD = 60;
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private const int BPAD = 40;
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private const int GAP = 10;
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private const int RULER = 10;
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private double FONT_SCALE = 1.0;
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public Spectrogram () {
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// Pango/Quartz fonts are smaller than on X.
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if (Config.HOST_OS.down ().has_prefix ("darwin")) {
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FONT_SCALE = 1.4;
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}
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// Pre-draw the palette.
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palette = new ImageSurface (Format.RGB24, RULER, BANDS);
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for (int y = 0; y < BANDS; y++) {
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var color = get_color (y / (double) BANDS);
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for (int x = 0; x < RULER; x++) {
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put_pixel (palette, x, y, color);
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}
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}
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show_all ();
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}
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public void open (string file_name) {
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this.file_name = file_name;
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this.info = "";
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start ();
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}
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public void save (string file_name) {
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var surface = new ImageSurface (Format.RGB24, allocation.width, allocation.height);
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draw (new Cairo.Context (surface));
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surface.write_to_png (file_name);
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}
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private void start () {
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if (pipeline != null) {
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pipeline.stop ();
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}
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// The number of samples is the number of pixels available for the image.
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// The number of bands is fixed, FFT results are very different for
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// different values but we need some consistency.
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int samples = allocation.width - LPAD - RPAD;
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if (samples > 0) {
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image = new ImageSurface (Format.RGB24, samples, BANDS);
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pipeline = new Pipeline (file_name, BANDS, samples, THRESHOLD, data_cb);
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pipeline.start ();
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info = pipeline.description;
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} else {
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image = null;
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pipeline = null;
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}
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queue_draw ();
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}
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private int prev_width = -1;
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protected override void size_allocate (Gdk.Rectangle allocation) {
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base.size_allocate (allocation);
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bool width_changed = prev_width != allocation.width;
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prev_width = allocation.width;
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if (file_name != null && width_changed) {
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start ();
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}
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}
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private double log10_threshold = Math.log10 (-THRESHOLD);
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private void data_cb (int sample, float[] values) {
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for (int y = 0; y < BANDS; y++) {
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var level = double.min (
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1.0, Math.log10 (1.0 - THRESHOLD + values[y]) / log10_threshold);
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put_pixel (image, sample, y, get_color (level));
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}
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Idle.add (() => { queue_draw (); return false; });
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}
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protected override bool expose_event (EventExpose event) {
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var cr = cairo_create (this.window);
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// Clip to the exposed area.
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cr.rectangle (event.area.x, event.area.y, event.area.width, event.area.height);
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cr.clip ();
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draw (cr);
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return true;
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}
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private void draw (Cairo.Context cr) {
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double w = allocation.width;
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double h = allocation.height;
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int text_width, text_height;
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// Clean the background.
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cr.set_source_rgb (0, 0, 0);
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cr.paint ();
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// Spek version
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cr.set_source_rgb (1, 1, 1);
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var layout = cairo_create_layout (cr);
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layout.set_font_description (FontDescription.from_string (
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"Sans " + (9 * FONT_SCALE).to_string ()));
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layout.set_width (RPAD * Pango.SCALE);
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layout.set_text ("v" + Config.PACKAGE_VERSION, -1);
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layout.get_pixel_size (out text_width, out text_height);
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int line_height = text_height;
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cr.move_to (w - (RPAD + text_width) / 2, TPAD - GAP);
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cairo_show_layout_line (cr, layout.get_line (0));
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layout.set_font_description (FontDescription.from_string (
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"Sans Bold " + (10 * FONT_SCALE).to_string ()));
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layout.set_text (Config.PACKAGE_NAME, -1);
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layout.get_pixel_size (out text_width, out text_height);
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cr.move_to (w - (RPAD + text_width) / 2, TPAD - 2 * GAP - line_height);
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cairo_show_layout_line (cr, layout.get_line (0));
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if (image != null) {
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// Draw the spectrogram.
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cr.translate (LPAD, h - BPAD);
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cr.scale (1, -(h - TPAD - BPAD) / image.get_height ());
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cr.set_source_surface (image, 0, 0);
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cr.paint ();
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cr.identity_matrix ();
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// Prepare to draw the rulers.
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cr.set_source_rgb (1, 1, 1);
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cr.set_line_width (1);
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cr.set_antialias (Antialias.NONE);
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layout.set_font_description (FontDescription.from_string (
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"Sans " + (8 * FONT_SCALE).to_string ()));
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layout.set_width (-1);
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// Time ruler.
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var duration_seconds = (int) pipeline.duration;
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var time_ruler = new Ruler (
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"00:00",
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{1, 2, 5, 10, 20, 30, 1*60, 2*60, 5*60, 10*60, 20*60, 30*60},
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duration_seconds,
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1.5,
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unit => (w - LPAD - RPAD) * unit / duration_seconds,
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unit => "%d:%02d".printf (unit / 60, unit % 60));
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cr.translate (LPAD, h - BPAD);
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time_ruler.draw (cr, layout, true);
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cr.identity_matrix ();
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// Frequency ruler.
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var freq = pipeline.sample_rate / 2;
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var rate_ruler = new Ruler (
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"00 kHz",
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{1000, 2000, 5000, 10000, 20000},
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freq,
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3.0,
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unit => (h - TPAD - BPAD) * unit / freq,
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unit => "%d kHz".printf (unit / 1000));
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cr.translate (LPAD, TPAD);
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rate_ruler.draw (cr, layout, false);
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cr.identity_matrix ();
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// File properties.
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cr.move_to (LPAD, TPAD - GAP);
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layout.set_font_description (FontDescription.from_string (
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"Sans " + (9 * FONT_SCALE).to_string ()));
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layout.set_width ((int) (w - LPAD - RPAD) * Pango.SCALE);
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layout.set_ellipsize (EllipsizeMode.END);
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layout.set_text (info, -1);
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cairo_show_layout_line (cr, layout.get_line (0));
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layout.get_pixel_size (out text_width, out text_height);
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// File name.
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cr.move_to (LPAD, TPAD - 2 * GAP - text_height);
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layout.set_font_description (FontDescription.from_string (
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"Sans Bold " + (10 * FONT_SCALE).to_string ()));
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layout.set_width ((int) (w - LPAD - RPAD) * Pango.SCALE);
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layout.set_ellipsize (EllipsizeMode.START);
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layout.set_text (file_name, -1);
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cairo_show_layout_line (cr, layout.get_line (0));
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}
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// Border around the spectrogram.
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cr.set_source_rgb (1, 1, 1);
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cr.set_line_width (1);
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cr.set_antialias (Antialias.NONE);
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cr.rectangle (LPAD, TPAD, w - LPAD - RPAD, h - TPAD - BPAD);
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cr.stroke ();
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// The palette.
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cr.translate (w - RPAD + GAP, h - BPAD);
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cr.scale (1, -(h - TPAD - BPAD) / palette.get_height ());
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cr.set_source_surface (palette, 0, 0);
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cr.paint ();
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cr.identity_matrix ();
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}
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private void put_pixel (ImageSurface surface, int x, int y, uint32 color) {
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var i = y * surface.get_stride () + x * 4;
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unowned uchar[] data = surface.get_data ();
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// Translate uchar* to uint32* to avoid dealing with endianness.
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uint32 *p = (uint32 *) (&data[i]);
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*p = color;
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}
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// Modified version of Dan Bruton's algorithm:
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// http://www.physics.sfasu.edu/astro/color/spectra.html
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private uint32 get_color (double level) {
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level *= 0.6625;
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double r = 0.0, g = 0.0, b = 0.0;
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if (level >= 0 && level < 0.15) {
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r = (0.15 - level) / (0.15 + 0.075);
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g = 0.0;
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b = 1.0;
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} else if (level >= 0.15 && level < 0.275) {
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r = 0.0;
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g = (level - 0.15) / (0.275 - 0.15);
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b = 1.0;
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} else if (level >= 0.275 && level < 0.325) {
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r = 0.0;
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g = 1.0;
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b = (0.325 - level) / (0.325 - 0.275);
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} else if (level >= 0.325 && level < 0.5) {
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r = (level - 0.325) / (0.5 - 0.325);
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g = 1.0;
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b = 0.0;
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} else if (level >= 0.5 && level < 0.6625) {
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r = 1.0;
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g = (0.6625 - level) / (0.6625 - 0.5f);
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b = 0.0;
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}
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// Intensity correction.
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double cf = 1.0;
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if (level >= 0.0 && level < 0.1) {
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cf = level / 0.1;
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}
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cf *= 255.0;
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// Pack RGB values into Cairo-happy format.
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uint32 rr = (uint32) (r * cf + 0.5);
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uint32 gg = (uint32) (g * cf + 0.5);
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uint32 bb = (uint32) (b * cf + 0.5);
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return (rr << 16) + (gg << 8) + bb;
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}
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}
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}
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