From af9c9091ed69394171485aa4c4814504f86f2004 Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Mon, 23 Jan 2012 20:08:12 +0100
Subject: Simple image blit. New slider class. New filenamelineedit. New
 pixelbuffer used for drawing everything but the root window - with alpha
 blending...

---
 plugingui/pixelbuffer.cc | 122 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 122 insertions(+)
 create mode 100644 plugingui/pixelbuffer.cc

(limited to 'plugingui/pixelbuffer.cc')

diff --git a/plugingui/pixelbuffer.cc b/plugingui/pixelbuffer.cc
new file mode 100644
index 0000000..fb4d05f
--- /dev/null
+++ b/plugingui/pixelbuffer.cc
@@ -0,0 +1,122 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ *            pixelbuffer.cc
+ *
+ *  Thu Nov 10 09:00:38 CET 2011
+ *  Copyright 2011 Bent Bisballe Nyeng
+ *  deva@aasimon.org
+ ****************************************************************************/
+
+/*
+ *  This file is part of DrumGizmo.
+ *
+ *  DrumGizmo 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.
+ *
+ *  DrumGizmo 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 DrumGizmo; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
+ */
+#include "pixelbuffer.h"
+
+#include <stdio.h>
+
+GUI::PixelBuffer::PixelBuffer(size_t width, size_t height)
+{
+  buf = NULL;
+  realloc(width, height);
+}
+
+void GUI::PixelBuffer::realloc(size_t width, size_t height)
+{
+  if(buf) free(buf);
+  buf = (unsigned char *)calloc(width * height, 3);
+  this->width = width;
+  this->height = height;
+}
+
+#define PX(k) (x + y * width) * 3 + k
+void GUI::PixelBuffer::setPixel(size_t x, size_t y,
+                                unsigned char red,
+                                unsigned char green,
+                                unsigned char blue,
+                                unsigned char alpha)
+{
+  //printf("%d %d %d\n", red, green, blue);
+  if(x >= width || y >= height) return;
+  float a = alpha / 255.0;
+  buf[PX(0)] = (unsigned char)(red * a + buf[PX(0)] * (1-a));
+  buf[PX(1)] = (unsigned char)(green * a + buf[PX(1)] * (1-a));
+  buf[PX(2)] = (unsigned char)(blue * a + buf[PX(2)] * (1-a));
+}
+
+static int idx = 0;
+GUI::PixelBufferAlpha::PixelBufferAlpha(size_t width, size_t height)
+{
+  this->idx = ::idx++;
+  buf = NULL;
+  x = y = 0;
+  realloc(width, height);
+}
+
+void GUI::PixelBufferAlpha::realloc(size_t width, size_t height)
+{
+  if(buf) free(buf);
+  buf = (unsigned char *)calloc(width * height, 4);
+  this->width = width;
+  this->height = height;
+}
+
+#undef PX
+#define PX(k) (x + y * width) * 4 + k
+void GUI::PixelBufferAlpha::setPixel(size_t x, size_t y,
+                                     unsigned char red,
+                                     unsigned char green,
+                                     unsigned char blue,
+                                     unsigned char alpha)
+{
+  //  printf("%d %d %d %d\n", red, green, blue, alpha);
+  if(x >= width || y >= height) return;
+  buf[PX(0)] = red;
+  buf[PX(1)] = green;
+  buf[PX(2)] = blue;
+  buf[PX(3)] = alpha;
+}
+
+void GUI::PixelBufferAlpha::pixel(size_t x, size_t y,
+                                  unsigned char *red,
+                                  unsigned char *green,
+                                  unsigned char *blue,
+                                  unsigned char *alpha)
+{
+  //printf("%d %d %d\n", red, green, blue);
+  if(x > width || y > height) return;
+  *red = buf[PX(0)];
+  *green = buf[PX(1)];
+  *blue = buf[PX(2)];
+  *alpha = buf[PX(3)];
+}
+
+#ifdef TEST_PIXELBUFFER
+//Additional dependency files
+//deps:
+//Required cflags (autoconf vars may be used)
+//cflags:
+//Required link options (autoconf vars may be used)
+//libs:
+#include "test.h"
+
+TEST_BEGIN;
+
+// TODO: Put some testcode here (see test.h for usable macros).
+
+TEST_END;
+
+#endif/*TEST_PIXELBUFFER*/
-- 
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