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Replace GtkImage/GdkPixbuf with GtkDrawingArea/CairoImageSurface

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This commit is contained in:
Alexander Kojevnikov 2010-05-07 18:44:08 +10:00
parent f2e2c16c55
commit f4a2e3ce93
2 changed files with 35 additions and 16 deletions
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49
src/spek-spectrogram.vala
View File

@ -1,47 +1,62 @@
using Cairo;
using Gdk;
using Gtk;
namespace Spek {
class Spectrogram : Gtk.Image {
class Spectrogram : DrawingArea {
private Source source;
private const int THRESHOLD = -92;
private struct Color { uchar r; uchar g; uchar b; }
private ImageSurface image;
public Spectrogram () {
show_all ();
}
public void show_file (string file_name) {
pixbuf = new Pixbuf (Colorspace.RGB, false, 8, allocation.width, allocation.height);
pixbuf.fill (0);
public void open (string file_name) {
image = new ImageSurface (Format.RGB24, allocation.width, allocation.height);
source = new Source (
file_name, allocation.height, allocation.width,
THRESHOLD, source_callback);
queue_draw ();
}
private void source_callback (int sample, float[] values) {
var x = sample;
var rowstride = pixbuf.rowstride;
unowned uchar[] pixels = pixbuf.get_pixels ();
var stride = image.get_stride ();
unowned uchar[] data = image.get_data ();
for (int y = 0; y < values.length; y++) {
var i = (values.length - y - 1) * rowstride + x * 3;
var i = (values.length - y - 1) * stride + x * 4;
var level = float.min (
1f, Math.log10f (1f - THRESHOLD + values[y]) / Math.log10f (-THRESHOLD));
var color = get_color (level);
uint32 color = get_color (level);
if (sample < 20) {
// TODO: allocate additional space for this.
color = get_color (((float) y) / values.length);
}
pixels[i] = color.r;
pixels[i + 1] = color.g;
pixels[i + 2] = color.b;
uint32 *p = &data[i];
*p = color;
}
queue_draw_area (allocation.x + sample, allocation.y, 1, allocation.height);
queue_draw_area (sample, 0, 1, allocation.height);
}
private override bool expose_event (EventExpose event) {
var cr = cairo_create (this.window);
if (image == null) {
cr.set_source_rgb (0, 0, 0);
} else {
cr.set_source_surface (image, 0, 0);
}
cr.rectangle (event.area.x, event.area.y, event.area.width, event.area.height);
cr.fill ();
return true;
}
// Modified version of Dan Bruton's algorithm:
// http://www.physics.sfasu.edu/astro/color/spectra.html
private Color get_color (float level) {
private uint32 get_color (float level) {
level *= 0.6625f;
float r = 0.0f, g = 0.0f, b = 0.0f;
if (level >= 0f && level < 0.15f) {
@ -73,7 +88,11 @@ namespace Spek {
}
cf *= 255f;
return { (uchar) (r * cf + 0.5f), (uchar) (g * cf + 0.5f), (uchar) (b * cf + 0.5f) };
// Pack RGB values into Cairo-happy format.
uint32 rr = (uint32) (r * cf + 0.5f);
uint32 gg = (uint32) (g * cf + 0.5f);
uint32 bb = (uint32) (b * cf + 0.5f);
return (rr << 16) + (gg << 8) + bb;
}
}
}

2
src/spek-window.vala
View File

@ -33,7 +33,7 @@ namespace Spek {
STOCK_CANCEL, ResponseType.CANCEL,
STOCK_OPEN, ResponseType.ACCEPT, null);
if (chooser.run () == ResponseType.ACCEPT) {
spectrogram.show_file (chooser.get_filename ());
spectrogram.open (chooser.get_filename ());
}
chooser.destroy ();
}