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x11_render.c
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1994-06-29
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/* x11_render.c -- Rendering for X11
Copyright (C) 1993, 1994 John Harper <jsh@ukc.ac.uk>
This file is part of Jade.
Jade 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 2, or (at your option)
any later version.
Jade 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 Jade; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "jade.h"
#include "jade_protos.h"
_PR void x11_handle_gexposures(VW *);
_PR void x11_handle_expose(VW *, XExposeEvent *);
_PR void sys_scroll_vw(VW *, long);
static Bool
gex_pred(Display *dpy, XEvent *ev, XPointer arg)
{
return((ev->type == NoExpose) || (ev->type == GraphicsExpose));
}
void
x11_handle_gexposures(VW *vw)
{
XEvent ev;
do {
POS start, end;
unsigned int x1, y1, x2, y2;
XIfEvent(x11_display, &ev, gex_pred, (XPointer)NULL);
if(ev.type == NoExpose)
return;
x1 = ev.xgraphicsexpose.x;
y1 = ev.xgraphicsexpose.y;
x2 = x1 + ev.xgraphicsexpose.width;
y2 = y1 + ev.xgraphicsexpose.height;
if(y2 >= vw->vw_MessageLineY)
{
y2 = vw->vw_MessageLineY - 1;
draw_message_line(vw);
if(vw->vw_Message)
redraw_message(vw, vw->vw_Message, strlen(vw->vw_Message));
else
redraw_message(vw, "", 0);
if(y1 >= vw->vw_MessageLineY)
continue;
}
start.pos_Col = ((x1 - vw->vw_XStartPix) / vw->vw_FontX)
+ vw->vw_StartCol;
start.pos_Line = ((y1 - vw->vw_YStartPix) / vw->vw_FontY)
+ vw->vw_StartLine;
end.pos_Col = (((x2 - 1)- vw->vw_XStartPix) / vw->vw_FontX)
+ vw->vw_StartCol;
end.pos_Line = (((y2 - 1) - vw->vw_YStartPix) / vw->vw_FontY)
+ vw->vw_StartLine;
redraw_rect(vw, &start, &end, FALSE);
} while(ev.xgraphicsexpose.count > 0);
}
void
x11_handle_expose(VW *vw, XExposeEvent *ev)
{
POS start, end;
unsigned int x1, y1, x2, y2;
x1 = ev->x;
y1 = ev->y;
x2 = x1 + ev->width;
y2 = y1 + ev->height;
if(y2 >= vw->vw_MessageLineY)
{
y2 = vw->vw_MessageLineY - 1;
draw_message_line(vw);
if(vw->vw_Message)
redraw_message(vw, vw->vw_Message, strlen(vw->vw_Message));
else
redraw_message(vw, "", 0);
if(y1 >= vw->vw_MessageLineY)
return;
}
/*
* Special case of whole window being redrawn
*/
if((x1 == 0) && (y1 == 0) && (x2 >= vw->vw_XEndPix)
&& (y2 >= (vw->vw_MessageLineY - 1)))
redraw_all(vw);
else
{
start.pos_Col = ((x1 - vw->vw_XStartPix) / vw->vw_FontX)
+ vw->vw_StartCol;
start.pos_Line = ((y1 - vw->vw_YStartPix) / vw->vw_FontY)
+ vw->vw_StartLine;
end.pos_Col = (((x2 - 1)- vw->vw_XStartPix) / vw->vw_FontX)
+ vw->vw_StartCol;
end.pos_Line = (((y2 - 1) - vw->vw_YStartPix) / vw->vw_FontY)
+ vw->vw_StartLine;
redraw_rect(vw, &start, &end, TRUE);
}
}
/*
* Scrolls the view `lines' towards line 0,
*/
void
sys_scroll_vw(VW *vw, long lines)
{
int xsrc, ysrc, xwth, yht, xdst, ydst;
xsrc = vw->vw_XStartPix;
xwth = vw->vw_XWidthPix;
xdst = vw->vw_XStartPix;
if(lines > 0)
{
ysrc = vw->vw_YStartPix + (lines * vw->vw_FontY);
yht = vw->vw_YHeightPix - (lines * vw->vw_FontY);
ydst = vw->vw_YStartPix;
XCopyArea(x11_display, vw->vw_Window, vw->vw_Window,
vw->vw_WindowSys.ws_TextFontGC,
xsrc, ysrc,
xwth, yht,
xdst, ydst);
x11_handle_gexposures(vw);
XClearArea(x11_display, vw->vw_Window,
xsrc, vw->vw_YStartPix + yht,
xwth, ysrc - ydst,
False);
}
else if(lines < 0)
{
lines = 0 - lines;
ysrc = vw->vw_YStartPix;
yht = vw->vw_YHeightPix - (lines * vw->vw_FontY);
ydst = vw->vw_YStartPix + (lines * vw->vw_FontY);
XCopyArea(x11_display, vw->vw_Window, vw->vw_Window,
vw->vw_WindowSys.ws_TextFontGC,
xsrc, ysrc,
xwth, yht,
xdst, ydst);
x11_handle_gexposures(vw);
XClearArea(x11_display, vw->vw_Window,
xsrc, ysrc,
xwth, ydst - ysrc,
False);
}
}