for transparent drawable
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233
src/FbTk/Transparent.cc
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233
src/FbTk/Transparent.cc
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// Transparent.cc for FbTk - Fluxbox Toolkit
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// Copyright (c) 2003 Henrik Kinnunen (fluxgen(at)users.sourceforge.net)
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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// $Id: Transparent.cc,v 1.1 2003/04/20 13:27:16 fluxgen Exp $
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#include "Transparent.hh"
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#include "App.hh"
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// #ifdef HAVE_XRENDER
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#include <X11/extensions/Xrender.h>
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// #endif // HAVE_XRENDER
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#include <iostream>
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using namespace std;
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namespace {
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Picture createAlphaPic(Window drawable, unsigned char alpha) {
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Display *disp = FbTk::App::instance()->display();
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// try to find a specific render format
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XRenderPictFormat pic_format;
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pic_format.type = PictTypeDirect;
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pic_format.depth = 8; // alpha with bit depth 8
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pic_format.direct.alphaMask = 0xff;
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XRenderPictFormat *format = XRenderFindFormat(disp, PictFormatType |
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PictFormatDepth | PictFormatAlphaMask,
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&pic_format, 0);
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if (format == 0) {
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cerr<<"Warning! FbTk::Transparent: Failed to find valid format for alpha."<<endl;
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return 0;
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}
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// create one pixel pixmap with depth 8 for alpha
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Pixmap alpha_pm = XCreatePixmap(disp, drawable,
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1, 1, 8);
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if (alpha_pm == 0) {
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cerr<<"Warning! FbTk::Transparent: Failed to create alpha pixmap."<<endl;
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return 0;
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}
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// create picture with alpha_pm as repeated background
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XRenderPictureAttributes attr;
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attr.repeat = True; // small bitmap repeated
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Picture alpha_pic = XRenderCreatePicture(disp, alpha_pm,
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format, CPRepeat, &attr);
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if (alpha_pic == 0) {
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XFreePixmap(disp, alpha_pm);
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cerr<<"Warning! FbTk::Transparent: Failed to create alpha picture."<<endl;
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return 0;
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}
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// finaly set alpha and fill with it
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XRenderColor color;
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// calculate alpha percent and then scale it to short
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color.red = 0xFF;
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color.blue = 0xFF;
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color.green = 0xFF;
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color.alpha = ((unsigned short) (255 * alpha) << 8);
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XRenderFillRectangle(disp, PictOpSrc, alpha_pic, &color,
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0, 0, 1, 1);
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XFreePixmap(disp, alpha_pm);
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return alpha_pic;
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}
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};
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namespace FbTk {
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Transparent::Transparent(Drawable src, Drawable dest, unsigned char alpha, int screen_num):
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m_alpha_pic(0), m_src_pic(0), m_dest_pic(0),
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m_source(src), m_dest(dest), m_alpha(alpha) {
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allocAlpha(m_alpha);
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Display *disp = FbTk::App::instance()->display();
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XRenderPictFormat *format =
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XRenderFindVisualFormat(disp,
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DefaultVisual(disp, screen_num));
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if (src != 0 && format != 0) {
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m_src_pic = XRenderCreatePicture(disp, src, format,
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0, 0);
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}
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if (dest != 0 && format != 0) {
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m_dest_pic = XRenderCreatePicture(disp, dest, format,
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0, 0);
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}
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}
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Transparent::~Transparent() {
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if (m_alpha_pic != 0)
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freeAlpha();
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Display *disp = FbTk::App::instance()->display();
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if (m_dest_pic != 0)
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XRenderFreePicture(disp, m_dest_pic);
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if (m_src_pic != 0)
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XRenderFreePicture(disp, m_src_pic);
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}
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void Transparent::setAlpha(unsigned char alpha) {
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if (m_source == 0)
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return;
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freeAlpha();
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allocAlpha(alpha);
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}
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void Transparent::setDest(Drawable dest, int screen_num) {
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if (m_dest == dest)
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return;
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Display *disp = FbTk::App::instance()->display();
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if (m_dest_pic != 0) {
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XRenderFreePicture(disp, m_dest_pic);
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m_dest_pic = 0;
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}
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// create new dest pic if we have a valid dest drawable
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if (dest != 0) {
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XRenderPictFormat *format =
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XRenderFindVisualFormat(disp,
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DefaultVisual(disp, screen_num));
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if (format == 0)
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cerr<<"Warning! FbTk::Transparent: Failed to find format for screen("<<screen_num<<")"<<endl;
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m_dest_pic = XRenderCreatePicture(disp, dest, format, 0, 0);
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}
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m_dest = dest;
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}
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void Transparent::setSource(Drawable source, int screen_num) {
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if (m_source == source)
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return;
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if (m_alpha_pic != 0)
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freeAlpha();
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Display *disp = FbTk::App::instance()->display();
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if (m_src_pic != 0) {
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XRenderFreePicture(disp, m_src_pic);
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m_src_pic = 0;
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}
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m_source = source;
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allocAlpha(m_alpha);
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// create new source pic if we have a valid source drawable
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if (m_source != 0) {
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XRenderPictFormat *format =
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XRenderFindVisualFormat(disp,
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DefaultVisual(disp, screen_num));
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if (format == 0)
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cerr<<"Warning! FbTk::Transparent: Failed to find format for screen("<<screen_num<<")"<<endl;
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m_src_pic = XRenderCreatePicture(disp, m_source, format,
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0, 0);
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}
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}
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void Transparent::render(int src_x, int src_y,
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int dest_x, int dest_y,
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unsigned int width, unsigned int height) const {
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if (m_src_pic == 0 || m_dest_pic == 0 ||
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m_alpha_pic == 0)
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return;
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// render src+alpha to dest picture
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XRenderComposite(FbTk::App::instance()->display(),
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PictOpOver,
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m_src_pic,
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m_alpha_pic,
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m_dest_pic,
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src_x, src_y,
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0, 0,
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dest_x, dest_y,
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width, height);
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}
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void Transparent::allocAlpha(unsigned char alpha) {
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if (m_source == 0)
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return;
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if (m_alpha_pic != 0)
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freeAlpha();
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m_alpha_pic = createAlphaPic(m_source, alpha);
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m_alpha = alpha;
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}
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void Transparent::freeAlpha() {
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XRenderFreePicture(FbTk::App::instance()->display(), m_alpha_pic);
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m_alpha_pic = 0;
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m_alpha = 255;
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}
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}; // end namespace FbTk
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62
src/FbTk/Transparent.hh
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62
src/FbTk/Transparent.hh
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@ -0,0 +1,62 @@
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// Transparent.hh for FbTk - Fluxbox Toolkit
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// Copyright (c) 2003 Henrik Kinnunen (fluxgen(at)users.sourceforge.net)
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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// $Id: Transparent.hh,v 1.1 2003/04/20 13:27:16 fluxgen Exp $
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#ifndef FBTK_TRANSPARENT_HH
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#define FBTK_TRANSPARENT_HH
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#include <X11/Xlib.h>
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namespace FbTk {
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/// renders to drawable together with an alpha mask
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class Transparent {
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public:
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Transparent(Drawable source, Drawable dest, unsigned char alpha, int screen_num);
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~Transparent();
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/// sets alpha value
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void setAlpha(unsigned char alpha);
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/// sets source drawable
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void setSource(Drawable src, int screen_num);
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/// sets destination drawable
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void setDest(Drawable dest, int screen_num);
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/**
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renders to dest from src with specified coordinates and size
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*/
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void render(int src_x, int src_y,
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int dest_x, int dest_y,
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unsigned int width, unsigned int height) const;
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unsigned char alpha() const { return m_alpha; }
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private:
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void freeAlpha();
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void allocAlpha(unsigned char newval);
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unsigned long m_alpha_pic;
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unsigned long m_src_pic;
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unsigned long m_dest_pic;
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Drawable m_source, m_dest;
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unsigned char m_alpha;
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};
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}; // end namespace FbTk
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#endif // FBTK_TRANSPARENT_HH
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