[chronojump] Added methods for load, resize jpeg, png using Cairo
- From: Xavier de Blas <xaviblas src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [chronojump] Added methods for load, resize jpeg, png using Cairo
- Date: Thu, 1 Feb 2018 12:59:46 +0000 (UTC)
commit 081eb5a4db8cedc5cae0b486517b1513153501b7
Author: Xavier de Blas <xaviblas gmail com>
Date: Thu Feb 1 13:58:34 2018 +0100
Added methods for load, resize jpeg, png using Cairo
src/gui/preferences.cs | 2 +-
src/utilMultimedia.cs | 170 ++++++++++++++++++++++++++++++++++++++++++++++++
src/utilVideo.cs | 44 ------------
3 files changed, 171 insertions(+), 45 deletions(-)
---
diff --git a/src/gui/preferences.cs b/src/gui/preferences.cs
index 64be622..b92a2a3 100644
--- a/src/gui/preferences.cs
+++ b/src/gui/preferences.cs
@@ -328,7 +328,7 @@ public class PreferencesWindow
PreferencesWindowBox.radio_gstreamer_1_0.Active = true;
PreferencesWindowBox.label_test_sound_result.Text = "";
- PreferencesWindowBox.createComboCamera(UtilVideo.GetVideoDevices(),
preferences.videoDeviceNum);
+ PreferencesWindowBox.createComboCamera(UtilMultimedia.GetVideoDevices(),
preferences.videoDeviceNum);
string [] decs = {"1", "2", "3"};
diff --git a/src/utilMultimedia.cs b/src/utilMultimedia.cs
new file mode 100644
index 0000000..3905997
--- /dev/null
+++ b/src/utilMultimedia.cs
@@ -0,0 +1,170 @@
+/*
+ * This file is part of ChronoJump
+ *
+ * ChronoJump 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.
+ *
+ * ChronoJump 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Copyright (C) 2004-2017 Xavier de Blas <xaviblas gmail com>
+ */
+
+using System;
+using System.Text; //StringBuilder
+using System.Collections; //ArrayList
+using System.Collections.Generic; //List
+using System.Diagnostics; //for detect OS
+using System.IO; //for detect OS
+using Cairo;
+using Gdk;
+
+//this class tries to be a space for methods that are used in different classes
+public class UtilMultimedia
+{
+ /*
+ * VIDEO
+ */
+
+ public static string [] GetVideoDevices () {
+ List<LongoMatch.Video.Utils.Device> devices =
LongoMatch.Video.Utils.Device.ListVideoDevices();
+ string [] devicesStr = new String[devices.Count];
+ int count = 0;
+ LogB.Information("Searching video devices");
+ foreach(LongoMatch.Video.Utils.Device dev in devices) {
+ devicesStr[count++] = dev.ID.ToString();
+ LogB.Information(dev.ID.ToString());
+ }
+ return devicesStr;
+ }
+
+ /*
+ * IMAGES
+ */
+
+ private enum ImageTypes { UNKNOWN, PNG, JPEG }
+ private static ImageTypes getImageType(string filename)
+ {
+ if(filename.ToLower().EndsWith("jpeg") || filename.ToLower().EndsWith("jpg"))
+ return ImageTypes.JPEG;
+ else if(filename.ToLower().EndsWith("png"))
+ return ImageTypes.PNG;
+
+ return ImageTypes.UNKNOWN;
+ }
+
+ public static void ResizeImages()
+ {
+ string file1 = "/home/xavier/Imatges/tenerife.png";
+ string file2 = "/home/xavier/Imatges/2016-06-07-152244.jpg";
+ string file3 = "/home/xavier/Imatges/humor-desmotivaciones-ofender-lasers.jpeg";
+
+ resizeImage(file1, "/home/xavier/Imatges/prova1.png", 100, 150);
+ resizeImage(file2, "/home/xavier/Imatges/prova2.png", 200, 200);
+ resizeImage(file3, "/home/xavier/Imatges/prova3.png", 400, 350);
+ }
+
+ private static void resizeImage(string filenameOriginal, string filenameDest, int width, int height)
+ {
+ ImageSurface imgSurface;
+ if(getImageType(filenameOriginal) == ImageTypes.PNG)
+ {
+ imgSurface = LoadPngToCairoImageSurface(filenameOriginal);
+ }
+ else if(getImageType(filenameOriginal) == ImageTypes.JPEG)
+ {
+ imgSurface = LoadJpegToCairoImageSurface(filenameOriginal);
+ }
+ else //(getImageType(filenameOriginal) == ImageTypes.UNKNOWN)
+ {
+ return;
+ }
+
+ ImageSurfaceResize(imgSurface, filenameDest, width, height);
+ }
+
+ public static ImageSurface LoadJpegToCairoImageSurface(string jpegFilename)
+ {
+ Gdk.Pixbuf pixbuf = new Pixbuf (jpegFilename); //from a file
+ return pixbufToCairoImageSurface(pixbuf);
+ }
+
+ // Thanks to: Chris Thomson
+ // https://stackoverflow.com/questions/25106063/how-do-i-draw-pixbufs-onto-a-surface-with-cairo-sharp
+ private static ImageSurface pixbufToCairoImageSurface(Pixbuf pixbuf)
+ {
+ ImageSurface imgSurface = new ImageSurface(Format.ARGB32, pixbuf.Width, pixbuf.Height);
+
+ using (Cairo.Context cr = new Cairo.Context(imgSurface)) {
+ Gdk.CairoHelper.SetSourcePixbuf (cr, pixbuf, 0, 0);
+ cr.Paint ();
+ cr.Dispose ();
+ }
+
+ return imgSurface;
+ }
+
+ public static ImageSurface LoadPngToCairoImageSurface (string pngFilename)
+ {
+ Cairo.ImageSurface imgSurface = new Cairo.ImageSurface(pngFilename);
+ Context cr = new Context(imgSurface);
+ cr.SetSource(imgSurface);
+ cr.Paint();
+ cr.Dispose ();
+
+ return imgSurface;
+ }
+
+ public static void ImageSurfaceResize(ImageSurface imgSurface, string filename_dest,
+ int width, int height)
+ {
+ Surface surfaceResized = scale_surface(
+ imgSurface, imgSurface.Width, imgSurface.Height, width, height);
+
+ LogB.Information("ImageFileResize - " + filename_dest);
+ try {
+ surfaceResized.WriteToPng(filename_dest);
+ } catch {
+ LogB.Warning("Catched at ImageFileResize");
+ }
+ }
+
+ // Thanks to: Owen Taylor
+ // https://lists.freedesktop.org/archives/cairo/2006-January/006178.html
+ private static Surface scale_surface (Surface old_surface,
+ int old_width, int old_height,
+ int new_width, int new_height)
+ {
+ Surface new_surface = old_surface.CreateSimilar(Cairo.Content.ColorAlpha, new_width,
new_height);
+ Context cr = new Context (new_surface);
+
+ /* Scale *before* setting the source surface (1) */
+ cr.Scale ((double)new_width / old_width, (double)new_height / old_height);
+ cr.SetSourceSurface (old_surface, 0, 0);
+
+ /* To avoid getting the edge pixels blended with 0 alpha, which would
+ * occur with the default EXTEND_NONE. Use EXTEND_PAD for 1.2 or newer (2)
+ */
+ Cairo.Pattern pattern = new SurfacePattern (old_surface);
+ pattern.Extend = Cairo.Extend.Reflect;
+
+ /* Replace the destination with the source instead of overlaying */
+ cr.Operator = Cairo.Operator.Source;
+
+ /* Do the actual drawing */
+ cr.Paint();
+
+ cr.Dispose();
+
+ return new_surface;
+ }
+
+}
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