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Fixes the bug, which caused dtterm to show stripes of wrong color between text lines when using fontsets that include fonts of slightly different heights.

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The cause of the bug was that X*DrawImageString draws background
according to the extents of the given string, not to extents of the font set,
which determine terminal line height.

Now, when such a situation is detected, the background is cleared before
drawing the characters.
This commit is contained in:
Eugene Doudine 2014-05-03 21:02:50 +03:00 • committed by Jon Trulson
parent a9dbe60805
commit 4e2adc1f8e
1 changed files with 77 additions and 50 deletions
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97
cde/lib/DtTerm/TermPrim/TermPrimRenderFontSet.c
View file

@ -64,10 +64,57 @@ FontSetRenderFunction(
XGCValues values;
unsigned long valueMask;
TermFontSet termFontSet = (TermFontSet) font->fontInfo;
int escapement;
XRectangle extents;
Boolean fixExtents;
/* set the renderGC... */
valueMask = (unsigned long) 0;
/* set background... */
if (tpd->renderGC.background != bg) {
tpd->renderGC.background = bg;
values.background = bg;
valueMask |= GCBackground;
}
/* since Xlib will be mucking with the GC's font under us, we need to
* make sure we trash the cached value...
*/
tpd->renderGC.fid = (Font) 0;
escapement = (tpd->mbCurMax == 1) ?
XmbTextExtents(termFontSet->fontSet, (char *) string, len,
NULL, &extents) :
XwcTextExtents(termFontSet->fontSet, (wchar_t*) string, len,
NULL, &extents);
/* Text height may be smaller than cellHeight (happens when using font sets).
In this case we need to fill background manually and then use X*DrawString
instead of X*DrawImageString */
fixExtents = extents.height < tpd->cellHeight;
if (fixExtents) {
/* set background color as foreground if needed*/
if (tpd->renderGC.foreground != bg) {
tpd->renderGC.foreground = bg;
valueMask|= GCForeground ;
values.foreground = bg;
}
if (valueMask) {
(void) XChangeGC(XtDisplay(w), tpd->renderGC.gc, valueMask, &values);
valueMask= (unsigned long) 0;
}
/* paint background manually */
(void) XFillRectangle(XtDisplay(w),
XtWindow(w),
tpd->renderGC.gc,
x,
y,
escapement,
tpd->cellHeight);
}
/* set the foreground... */
if (TermIS_SECURE(flags)) {
if (tpd->renderGC.foreground != bg) {
@ -82,19 +129,6 @@ FontSetRenderFunction(
valueMask |= GCForeground;
}
}
/* set background... */
if (tpd->renderGC.background != bg) {
tpd->renderGC.background = bg;
values.background = bg;
valueMask |= GCBackground;
}
/* since Xlib will be mucking with the GC's font under us, we need to
* make sure we trash the cached value...
*/
tpd->renderGC.fid = (Font) 0;
if (valueMask) {
(void) XChangeGC(XtDisplay(w), tpd->renderGC.gc, valueMask,
&values);
@ -102,6 +136,10 @@ FontSetRenderFunction(
/* draw image string a line of text... */
if (isDebugFSet('t', 1)) {
/* we need to clear background after the debug draw and delay,
so this will cause X*DrawImageString to be always used
in debug mode */
fixExtents = 0;
#ifdef BBA
#pragma BBA_IGNORE
#endif /*BBA*/
@ -113,18 +151,18 @@ FontSetRenderFunction(
tpd->renderGC.gc,
x,
y,
(tpd->mbCurMax == 1) ?
XmbTextEscapement(termFontSet->fontSet, (char *) string, len) :
XwcTextEscapement(termFontSet->fontSet, (wchar_t *) string,
len),
tpd->cellHeight);
escapement,
extents.height);
(void) XSync(XtDisplay(w), False);
(void) shortSleep(100000);
}
if (tpd->mbCurMax == 1)
{
(void) XmbDrawImageString(XtDisplay(w),/* Display */
/* select right function, we do not want text background be drawn twice */
(void) (fixExtents ? XmbDrawString: XmbDrawImageString)
(XtDisplay(w), /* Display */
XtWindow(w), /* Drawable */
termFontSet->fontSet, /* XFontSet */
tpd->renderGC.gc, /* GC */
@ -144,22 +182,12 @@ FontSetRenderFunction(
(char *)string, /* string */
len); /* length */
}
/* handle the underline enhancement... */
/* draw the underline... */
if (TermIS_UNDERLINE(flags)) {
XDrawLine(XtDisplay(w), /* Display */
XtWindow(w), /* Window */
tpd->renderGC.gc, /* GC */
x, /* X1 */
y + tpd->cellHeight - 1, /* Y1 */
x - 1 + XmbTextEscapement(termFontSet->fontSet,
(char *) string, len), /* X2 */
y + tpd->cellHeight - 1);/* Y2 */
}
}
else
{
(void) XwcDrawImageString(XtDisplay(w), /* Display */
/* select right function, we do not want text background be drawn twice */
(void) (fixExtents ? XwcDrawString: XwcDrawImageString)
(XtDisplay(w), /* Displa*/
XtWindow(w), /* Drawable */
termFontSet->fontSet, /* XFontSet */
tpd->renderGC.gc, /* GC */
@ -179,6 +207,7 @@ FontSetRenderFunction(
(wchar_t *) string, /* string */
len); /* length */
}
}
/* handle the underline enhancement... */
/* draw the underline... */
if (TermIS_UNDERLINE(flags)) {
@ -187,11 +216,9 @@ FontSetRenderFunction(
tpd->renderGC.gc, /* GC */
x, /* X1 */
y + tpd->cellHeight - 1, /* Y1 */
x - 1 + XwcTextEscapement(termFontSet->fontSet,
(wchar_t *) string, len), /* X2 */
x - 1 + escapement, /* X2 */
y + tpd->cellHeight - 1); /* Y2 */
}
}
}
static void