1 files changed, 47 insertions, 0 deletions

diff --git a/util/fbcompose/OpenGLUtility.cc b/util/fbcompose/OpenGLUtility.cc
new file mode 100644
index 0000000..c2c1510
--- /dev/null
+++ b/util/fbcompose/OpenGLUtility.cc
@@ -0,0 +1,47 @@
+/** OpenGLUtility.cc file for the fluxbox compositor. */
+
+// Copyright (c) 2011 Gediminas Liktaras (gliktaras at gmail dot com)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+
+#include "OpenGLUtility.hh"
+
+using namespace FbCompositor;
+
+
+//--- FUNCTIONS ----------------------------------------------------------------
+
+// Converts screen coordinates to OpenGL coordinates.
+void FbCompositor::toOpenGLCoords(int screen_width, int screen_height, int x, int y, int width, int height,
+                                  GLfloat *x_low_return, GLfloat *x_high_return, GLfloat *y_low_return,
+                                  GLfloat *y_high_return) {
+    *x_low_return  = ((x * 2.0) / screen_width) - 1.0;
+    *x_high_return = (((x + width) * 2.0) / screen_width) - 1.0;
+    *y_low_return  = 1.0 - ((y * 2.0) / screen_height);
+    *y_high_return = 1.0 - (((y + height) * 2.0) / screen_height);
+}
+
+// Converts screen coordinates to OpenGL coordinates. */
+void FbCompositor::toOpenGLCoords(int screen_width, int screen_height, XRectangle rect,
+                                  GLfloat *x_low_return, GLfloat *x_high_return, GLfloat *y_low_return,
+                                  GLfloat *y_high_return) {
+    toOpenGLCoords(screen_width, screen_height, rect.x, rect.y, rect.width, rect.height,
+                        x_low_return, x_high_return, y_low_return, y_high_return);
+}