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// $Id: xxPixmapGraph.cc 2641 2007-09-02 21:31:02Z flaterco $
/* xxPixmapGraph Graph implemented as Pixmap.
Copyright (C) 1998 David Flater.
This program 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 3 of the License, or
(at your option) any later version.
This program 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, see <http://www.gnu.org/licenses/>.
*/
#include "xtide.hh"
#include "Graph.hh"
#include "RGBGraph.hh"
#include "xxPixmapGraph.hh"
xxPixmapGraph::xxPixmapGraph (unsigned xSize,
unsigned ySize,
GraphStyle style):
Graph (xSize, ySize, style),
antiAliasingDisabled (xxX::displaySucks || Global::settings["aa"].c == 'n'),
pixelCache(NULL) {
assert (xSize >= Global::minGraphWidth && ySize >= Global::minGraphHeight);
pixmap = xxX::makePixmap (xSize, ySize);
}
xxPixmapGraph::~xxPixmapGraph() {
stopPixelCache();
XFreePixmap (xxX::display, pixmap);
}
const unsigned xxPixmapGraph::stringWidth (const Dstr &s) const {
return xxX::stringWidth (xxX::smallFontStruct, s);
}
const unsigned xxPixmapGraph::fontHeight() const {
return xxX::smallFontHeight;
}
void xxPixmapGraph::setPixel (int x, int y, Colors::Colorchoice c) {
if (x < 0 || x >= (int)_xSize || y < 0 || y >= (int)_ySize)
return;
XSetForeground (xxX::display, xxX::spareGC, xxX::pixels[c]);
XDrawPoint (xxX::display, pixmap, xxX::spareGC, x, y);
}
void xxPixmapGraph::setPixel (int x,
int y,
Colors::Colorchoice c,
double saturation) {
if (x < 0 || x >= (int)_xSize || y < 0 || y >= (int)_ySize)
return;
if (antiAliasingDisabled) {
if (saturation >= 0.5)
setPixel (x, y, c);
} else {
// We arrive at this sorry crossroads as a result of these
// unhealthy facts about Xlib:
// 1. Apart from doing XGetImage, there is no way to "read"
// the value of a pixel in a Pixmap.
// 2. The drawing functions XDrawPoint, XDrawLine, and XDrawString
// only work on "drawables." Windows and Pixmaps are drawables;
// XImages are not. So it's not possible to avoid the kludge
// by using XImages instead of Pixmaps everywhere.
// It would be nice to just inherit everything from RGBGraph and then
// convert the PPM to a Pixmap at the end, but this suddenly gets
// complicated when your display only supports 256 colors. It's also
// intolerably slow. The only remaining alternative would be to
// duplicate the effort in RGBGraph to create an XImage at the PutPixel
// level, sans even XDrawLine to speed things up. This would probably
// be even slower than the current implementation (I guess).
// 2005-12-24 Pixel cache added to speed this up.
Pixel pixel;
if (pixelCache)
pixel = XGetPixel (pixelCache, x, y);
else {
XImage *img (XGetImage (xxX::display, pixmap, x, y, 1, 1,
AllPlanes, ZPixmap));
pixel = XGetPixel (img, 0, 0);
XDestroyImage (img);
}
unsigned short r1, g1, b1, r2, g2, b2;
xxX::colorOfPixel (pixel, r1, g1, b1);
xxX::colorOfPixel (xxX::pixels[c], r2, g2, b2);
XSetForeground (xxX::display,
xxX::spareGC,
xxX::getColor (linterp (r1, r2, saturation),
linterp (g1, g2, saturation),
linterp (b1, b2, saturation)));
XDrawPoint (xxX::display, pixmap, xxX::spareGC, x, y);
}
}
void xxPixmapGraph::drawVerticalLine (int x,
int y1,
int y2,
Colors::Colorchoice c) {
XSetForeground (xxX::display, xxX::spareGC, xxX::pixels[c]);
XDrawLine (xxX::display, pixmap, xxX::spareGC, x, y1, x, y2);
}
void xxPixmapGraph::drawHorizontalLine (int xlo,
int xhi,
int y,
Colors::Colorchoice c) {
XSetForeground (xxX::display, xxX::spareGC, xxX::pixels[c]);
if (xlo <= xhi) // Constraint per Graph::drawHorizontalLine.
XDrawLine (xxX::display, pixmap, xxX::spareGC, xlo, y, xhi, y);
}
void xxPixmapGraph::drawString (int x, int y, const Dstr &s) {
XDrawString (xxX::display, pixmap, xxX::textGC, x, y+fontHeight()-2,
s.aschar(), s.length());
}
void xxPixmapGraph::startPixelCache() {
assert (!pixelCache);
if (!antiAliasingDisabled)
pixelCache = XGetImage (xxX::display, pixmap, 0, 0, _xSize, _ySize,
AllPlanes, ZPixmap);
}
void xxPixmapGraph::stopPixelCache() {
if (pixelCache) {
XDestroyImage (pixelCache);
pixelCache = NULL;
}
}
// Cleanup2006 Done
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