for transparent drawable

1 files changed, 233 insertions, 0 deletions

diff --git a/src/FbTk/Transparent.cc b/src/FbTk/Transparent.cc
new file mode 100644
index 0000000..e3e1698
--- /dev/null
+++ b/src/FbTk/Transparent.cc
@@ -0,0 +1,233 @@
+// Transparent.cc for FbTk - Fluxbox Toolkit
+// Copyright (c) 2003 Henrik Kinnunen (fluxgen(at)users.sourceforge.net)
+// 
+// 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.
+
+// $Id: Transparent.cc,v 1.1 2003/04/20 13:27:16 fluxgen Exp $
+
+#include "Transparent.hh"
+#include "App.hh"
+
+// #ifdef HAVE_XRENDER
+#include <X11/extensions/Xrender.h>
+// #endif // HAVE_XRENDER
+
+#include <iostream>
+using namespace std;
+
+namespace {
+
+Picture createAlphaPic(Window drawable, unsigned char alpha) {
+    Display *disp = FbTk::App::instance()->display();
+
+    // try to find a specific render format
+    XRenderPictFormat pic_format;
+    pic_format.type  = PictTypeDirect;
+    pic_format.depth = 8; // alpha with bit depth 8
+    pic_format.direct.alphaMask = 0xff;    
+    XRenderPictFormat *format = XRenderFindFormat(disp, PictFormatType |
+                                                  PictFormatDepth | PictFormatAlphaMask,
+                                                  &pic_format, 0);
+    if (format == 0) {
+        cerr<<"Warning! FbTk::Transparent:  Failed to find valid format for alpha."<<endl;
+        return 0;
+    }
+
+    // create one pixel pixmap with depth 8 for alpha
+    Pixmap alpha_pm = XCreatePixmap(disp, drawable,
+                                    1, 1, 8);
+    if (alpha_pm == 0) {
+        cerr<<"Warning! FbTk::Transparent: Failed to create alpha pixmap."<<endl;
+        return 0;
+    }
+
+    // create picture with alpha_pm as repeated background
+    XRenderPictureAttributes attr;
+    attr.repeat = True; // small bitmap repeated
+    Picture alpha_pic = XRenderCreatePicture(disp, alpha_pm,
+                                             format, CPRepeat, &attr);
+    if (alpha_pic == 0) {
+        XFreePixmap(disp, alpha_pm);
+        cerr<<"Warning! FbTk::Transparent: Failed to create alpha picture."<<endl;
+        return 0;
+    }
+
+    // finaly set alpha and fill with it
+    XRenderColor color;
+    // calculate alpha percent and then scale it to short
+    color.red = 0xFF;
+    color.blue = 0xFF;
+    color.green = 0xFF;
+    color.alpha = ((unsigned short) (255 * alpha) << 8);
+
+    XRenderFillRectangle(disp, PictOpSrc, alpha_pic, &color,
+                         0, 0, 1, 1);
+
+    XFreePixmap(disp, alpha_pm);
+
+    return alpha_pic;
+}
+
+};
+
+namespace FbTk {
+
+
+Transparent::Transparent(Drawable src, Drawable dest, unsigned char alpha, int screen_num):
+    m_alpha_pic(0), m_src_pic(0), m_dest_pic(0),
+    m_source(src), m_dest(dest), m_alpha(alpha) {
+
+    allocAlpha(m_alpha);
+
+    Display *disp = FbTk::App::instance()->display();
+
+    XRenderPictFormat *format = 
+        XRenderFindVisualFormat(disp, 
+                                DefaultVisual(disp, screen_num));
+
+
+    if (src != 0 && format != 0) {
+        m_src_pic = XRenderCreatePicture(disp, src, format, 
+                                         0, 0);
+    }
+
+    if (dest != 0 && format != 0) {
+        m_dest_pic = XRenderCreatePicture(disp, dest, format,
+                                          0, 0);
+    }
+
+}
+
+Transparent::~Transparent() {
+    if (m_alpha_pic != 0)
+        freeAlpha();
+
+    Display *disp = FbTk::App::instance()->display();
+
+    if (m_dest_pic != 0)
+        XRenderFreePicture(disp, m_dest_pic);
+
+    if (m_src_pic != 0)
+        XRenderFreePicture(disp, m_src_pic);
+}
+
+void Transparent::setAlpha(unsigned char alpha) {
+    if (m_source == 0)
+        return;
+
+    freeAlpha();
+    allocAlpha(alpha);
+}
+
+void Transparent::setDest(Drawable dest, int screen_num) {
+    if (m_dest == dest)
+        return;
+
+    Display *disp = FbTk::App::instance()->display();
+
+    if (m_dest_pic != 0) {
+        XRenderFreePicture(disp, m_dest_pic);
+        m_dest_pic = 0;
+    }
+    // create new dest pic if we have a valid dest drawable
+    if (dest != 0) {
+
+        XRenderPictFormat *format = 
+            XRenderFindVisualFormat(disp, 
+                                    DefaultVisual(disp, screen_num));
+        if (format == 0)
+            cerr<<"Warning! FbTk::Transparent: Failed to find format for screen("<<screen_num<<")"<<endl;
+        m_dest_pic = XRenderCreatePicture(disp, dest, format, 0, 0);
+       
+
+    }
+    m_dest = dest;
+
+}
+
+void Transparent::setSource(Drawable source, int screen_num) {
+    if (m_source == source)
+        return;
+
+    if (m_alpha_pic != 0)
+        freeAlpha();
+
+    Display *disp = FbTk::App::instance()->display();   
+
+    if (m_src_pic != 0) {
+        XRenderFreePicture(disp, m_src_pic);
+        m_src_pic = 0;
+    }
+
+    m_source = source;
+    allocAlpha(m_alpha);
+
+    // create new source pic if we have a valid source drawable
+    if (m_source != 0) {
+
+        XRenderPictFormat *format = 
+            XRenderFindVisualFormat(disp, 
+                                    DefaultVisual(disp, screen_num));
+        if (format == 0)
+            cerr<<"Warning! FbTk::Transparent: Failed to find format for screen("<<screen_num<<")"<<endl;
+        m_src_pic = XRenderCreatePicture(disp, m_source, format, 
+                                         0, 0);    
+    }
+}
+
+void Transparent::render(int src_x, int src_y,
+                         int dest_x, int dest_y,
+                         unsigned int width, unsigned int height) const {
+    if (m_src_pic == 0 || m_dest_pic == 0 ||
+        m_alpha_pic  == 0)
+        return;
+    // render src+alpha to dest picture
+    XRenderComposite(FbTk::App::instance()->display(), 
+                     PictOpOver, 
+                     m_src_pic,
+                     m_alpha_pic, 
+                     m_dest_pic, 
+                     src_x, src_y,
+                     0, 0, 
+                     dest_x, dest_y,
+                     width, height);
+
+
+}
+
+void Transparent::allocAlpha(unsigned char alpha) {
+    if (m_source == 0)
+        return;
+    if (m_alpha_pic != 0)
+        freeAlpha();
+
+    m_alpha_pic = createAlphaPic(m_source, alpha);
+    m_alpha = alpha;
+}
+
+void Transparent::freeAlpha() {
+    XRenderFreePicture(FbTk::App::instance()->display(), m_alpha_pic);
+    m_alpha_pic = 0;
+    m_alpha = 255;
+}
+
+}; // end namespace FbTk
+
+
+