lyx_mirror/src/Painter.C

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// -*- C++ -*-
/* This file is part of
* ======================================================
*
* LyX, The Document Processor
*
* Copyright 1998-2000 The LyX Team
*
*======================================================*/
#include <config.h>
#ifdef __GNUG__
#pragma implementation
#endif
#include <cmath>
#ifdef USE_STL_MEMORY
#include <memory>
#endif
#include FORMS_H_LOCATION
#include "Painter.h"
#include "LString.h"
#include "debug.h"
#include "lyxfont.h"
#include "support/LAssert.h"
#include "support/lstrings.h"
Painter::Painter(WorkArea & wa)
: PainterBase(wa)
{
colormap = fl_state[fl_get_vclass()].colormap;
// Clear the GC cache
for (int i = 0; i <= LColor::ignore; ++i) {
colorGCcache[i] = 0;
}
}
Painter::~Painter() {
// Release all the registered GCs
for (int i = 0; i <= LColor::ignore; ++i) {
if (colorGCcache[i] != 0) {
XFreeGC(display, colorGCcache[i]);
}
}
// Iterate over the line cache and Free the GCs
for (LineGCCache::iterator lit = lineGCcache.begin();
lit != lineGCcache.end(); ++lit) {
XFreeGC(display, (*lit).second);
}
}
/* Basic drawing routines */
extern bool Lgb_bug_find_hack;
PainterBase & Painter::point(int x, int y, LColor::color c)
{
if (lyxerr.debugging()) {
if (!Lgb_bug_find_hack)
lyxerr << "point not called from "
"workarea::workhandler\n";
lyxerr.debug() << "Painter drawable: " << drawable << endl;
}
XDrawPoint(display, drawable, getGCForeground(c), x, y);
return *this;
}
PainterBase & Painter::line(int x1, int y1, int x2, int y2,
LColor::color col,
enum line_style ls,
enum line_width lw)
{
if (lyxerr.debugging()) {
if (!Lgb_bug_find_hack)
lyxerr << "line not called from "
"workarea::workhandler\n";
lyxerr.debug() << "Painter drawable: " << drawable << endl;
}
XDrawLine(display, drawable,
getGCLinepars(ls, lw, col), x1, y1, x2, y2);
return *this;
}
PainterBase & Painter::lines(int const * xp, int const * yp, int np,
LColor::color col,
enum line_style ls,
enum line_width lw)
{
if (lyxerr.debugging()) {
if (!Lgb_bug_find_hack)
lyxerr << "lines not called from "
"workarea::workhandler\n";
lyxerr.debug() << "Painter drawable: " << drawable << endl;
}
#ifndef HAVE_AUTO_PTR
XPoint * points = new XPoint[np];
#else
auto_ptr<XPoint> points(new Xpoint[np]);
#endif
for (int i=0; i<np; ++i) {
points[i].x = xp[i];
points[i].y = yp[i];
}
XDrawLines(display, drawable, getGCLinepars(ls, lw, col),
points, np, CoordModeOrigin);
#ifndef HAVE_AUTO_PTR
delete[] points;
#endif
return *this;
}
PainterBase & Painter::rectangle(int x, int y, int w, int h,
LColor::color col,
enum line_style ls,
enum line_width lw)
{
if (lyxerr.debugging()) {
if (!Lgb_bug_find_hack)
lyxerr << "rectangle not called from "
"workarea::workhandler\n";
lyxerr << "Painter drawable: " << drawable << endl;
}
XDrawRectangle(display, drawable, getGCLinepars(ls, lw, col),
x, y, w, h);
return *this;
}
PainterBase & Painter::fillRectangle(int x, int y, int w, int h,
LColor::color col)
{
if (lyxerr.debugging()) {
if (!Lgb_bug_find_hack)
lyxerr << "fillrectangle not called from "
"workarea::workhandler\n";
lyxerr << "Painter drawable: " << drawable << endl;
}
XFillRectangle(display, drawable, getGCForeground(col), x, y, w, h);
return *this;
}
PainterBase & Painter::fillPolygon(int const * xp, int const * yp, int np,
LColor::color col)
{
if (lyxerr.debugging()) {
if (!Lgb_bug_find_hack)
lyxerr <<"fillpolygon not called from "
"workarea::workhandler\n";
lyxerr << "Painter drawable: " << drawable << endl;
}
#ifndef HAVE_AUTO_PTR
XPoint * points = new XPoint[np];
#else
auto_ptr<XPoint> points(new XPoint[np]);
#endif
for (int i=0; i<np; ++i) {
points[i].x = xp[i];
points[i].y = yp[i];
}
XFillPolygon(display, drawable, getGCForeground(col), points, np,
Nonconvex, CoordModeOrigin);
#ifndef HAVE_AUTO_PTR
delete[] points;
#endif
return *this;
}
PainterBase & Painter::arc(int x, int y,
unsigned int w, unsigned int h,
int a1, int a2, LColor::color col)
{
if (lyxerr.debugging()) {
if (!Lgb_bug_find_hack)
lyxerr << "arc not called from "
"workarea::workhandler\n";
lyxerr << "Painter drawable: " << drawable << endl;
}
XDrawArc(display, drawable, getGCForeground(col),
x, y, w, h, a1, a2);
return *this;
}
/// Draw lines from x1,y1 to x2,y2. They are arrays
PainterBase & Painter::segments(int const * x1, int const * y1,
int const * x2, int const * y2, int ns,
LColor::color col,
enum line_style ls, enum line_width lw)
{
if (lyxerr.debugging()) {
if (!Lgb_bug_find_hack)
lyxerr << "segments not called from "
"workarea::workhandler\n";
lyxerr << "Painter drawable: " << drawable << endl;
}
#ifndef HAVE_AUTO_PTR
XSegment * s= new XSegment[ns];
#else
auto_ptr<XSegment> s(new XSegment[ns]);
#endif
for (int i=0; i<ns; ++i) {
s[i].x1 = x1[i];
s[i].y1 = y1[i];
s[i].x2 = x2[i];
s[i].y2 = y2[i];
}
XDrawSegments(display, drawable, getGCLinepars(ls, lw, col), s, ns);
#ifndef HAVE_AUTO_PTR
delete [] s;
#endif
return *this;
}
PainterBase & Painter::pixmap(int x, int y, int w, int h, Pixmap bitmap)
{
if (lyxerr.debugging()) {
if (!Lgb_bug_find_hack)
lyxerr << "workAreaExpose not called from "
"workarea::workhandler\n";
lyxerr << "Painter drawable: " << drawable << endl;
}
XGCValues val;
val.function = GXcopy;
GC gc = XCreateGC(display, drawable,
GCFunction, &val);
XCopyArea(display, bitmap, drawable, gc,
0, 0, w, h, x, y);
XFreeGC(display, gc);
return *this;
}
PainterBase & Painter::text(int x, int y, string const & s, LyXFont const & f)
{
return text(x, y, s.c_str(), s.length(), f);
}
PainterBase & Painter::text(int x, int y, char c, LyXFont const & f)
{
char s[2] = { c, '\0' };
return text(x, y, s, 1, f);
}
PainterBase & Painter::text(int x, int y, char const * s, int ls,
LyXFont const & f)
{
if (lyxerr.debugging()) {
if (!Lgb_bug_find_hack)
lyxerr << "text not called from "
"workarea::workhandler\n";
lyxerr << "Painter drawable: " << drawable << endl;
}
GC gc = getGCForeground(f.realColor());
XSetFont(display, gc, f.getFontID());
XDrawString(display, drawable, gc, x, y, s, ls);
underline(f, x, y, this->width(s, ls, f));
return *this;
}
void Painter::underline(LyXFont const & f, int x, int y, int width)
{
// What about underbars?
if (f.underbar() == LyXFont::ON && f.latex() != LyXFont::ON) {
int below = f.maxDescent() / 2;
if (below < 2) below = 2;
int height = (f.maxDescent() / 4) - 1;
if (height < 0) height = 0;
fillRectangle(x, y + below, width, below + height, f.color());
}
}
// Gets GC according to color
// Uses caching
GC Painter::getGCForeground(LColor::color c)
{
if (lyxerr.debugging()) {
lyxerr << "Painter drawable: " << drawable << endl;
}
if (colorGCcache[c] != 0) return colorGCcache[c];
XColor xcol, ccol;
string s = lcolor.getX11Name(c);
XGCValues val;
// Look up the RGB values for the color, and an approximate
// color that we can hope to get on this display.
if (XLookupColor(display, colormap, s.c_str(), &xcol, &ccol) == 0) {
lyxerr << _("LyX: Unknown X11 color ") << s
<< _(" for ") << lcolor.getGUIName(c) << '\n'
<< _(" Using black instead, sorry!.") << endl;
unsigned long bla = BlackPixel(display,
DefaultScreen(display));
val.foreground = bla;
// Try the exact RGB values first, then the approximate.
} else if (XAllocColor(display, colormap, &xcol) != 0) {
if (lyxerr.debugging()) {
lyxerr << _("LyX: X11 color ") << s
<< _(" allocated for ")
<< lcolor.getGUIName(c) << endl;
}
val.foreground = xcol.pixel;
} else if (XAllocColor(display, colormap, &ccol)) {
lyxerr << _("LyX: Using approximated X11 color ") << s
<< _(" allocated for ")
<< lcolor.getGUIName(c) << endl;
val.foreground = xcol.pixel;
} else {
// Here we are traversing the current colormap to find
// the color closest to the one we want.
Visual * vi = DefaultVisual(display, DefaultScreen(display));
XColor * cmap = new XColor[vi->map_entries];
for(int i = 0; i < vi->map_entries; ++i) {
cmap[i].pixel = i;
}
XQueryColors(display, colormap, cmap, vi->map_entries);
// Walk through the cmap and look for close colors.
int closest_pixel = 0;
double closest_distance = 1e20; // we want to minimize this
double distance = 0;
for(int t = 0; t < vi->map_entries; ++t) {
// The Euclidean distance between two points in
// a three-dimensional space, the RGB color-cube,
// is used as the distance measurement between two
// colors.
// Since square-root is monotonous, we don't have to
// take the square-root to find the minimum, and thus
// we use the squared distance instead to be faster.
// If we want to get fancy, we could convert the RGB
// coordinates to a different color-cube, maybe HSV,
// but the RGB cube seems to work great. (Asger)
distance = pow(cmap[t].red - xcol.red, 2.0) +
pow(cmap[t].green - xcol.green, 2.0) +
pow(cmap[t].blue - xcol.blue, 2.0);
if (distance < closest_distance) {
closest_distance = distance;
closest_pixel = t;
}
}
lyxerr << _("LyX: Couldn't allocate '") << s
<< _("' for ") << lcolor.getGUIName(c)
<< _(" with (r,g,b)=(")
<< xcol.red << "," << xcol.green << ","
<< xcol.blue << ").\n"
<< _(" Using closest allocated "
"color with (r,g,b)=(")
<< cmap[closest_pixel].red << ","
<< cmap[closest_pixel].green << ","
<< cmap[closest_pixel].blue << ") instead.\n"
<< "Pixel [" << closest_pixel << "] is used." << endl;
val.foreground = cmap[closest_pixel].pixel;
delete[] cmap;
}
val.function = GXcopy;
return colorGCcache[c] = XCreateGC(display, drawable,
GCForeground | GCFunction, &val);
}
// Gets GC for line
GC Painter::getGCLinepars(enum line_style ls,
enum line_width lw, LColor::color c)
{
if (lyxerr.debugging()) {
lyxerr << "Painter drawable: " << drawable << endl;
}
int index = lw + (ls << 1) + (c << 3);
if (lineGCcache.find(index) != lineGCcache.end())
return lineGCcache[index];
XGCValues val;
XGetGCValues(display, getGCForeground(c), GCForeground, &val);
switch (lw) {
case line_thin: val.line_width = 0; break;
case line_thick: val.line_width = 2; break;
}
switch (ls) {
case line_solid: val.line_style = LineSolid; break;
case line_onoffdash: val.line_style = LineOnOffDash; break;
case line_doubledash: val.line_style = LineDoubleDash; break;
}
val.cap_style = CapRound;
val.join_style = JoinRound;
val.function = GXcopy;
return lineGCcache[index] =
XCreateGC(display, drawable,
GCForeground | GCLineStyle | GCLineWidth |
GCCapStyle | GCJoinStyle | GCFunction, &val);
}