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Fix possible chart rendering problem for single pixels 

Generalize the special case of drawing a single pixel in a chart in
case the two y coordinates happen to be identical.

This should fix https://bugs.gentoo.org/show_bug.cgi?id=438872
This commit is contained in:
Stefan Gehn 2016-02-11 18:33:50 +01:00
parent d188b31a34
commit 83d18ccdf9
1 changed files with 13 additions and 7 deletions
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20
src/chart.c
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@ -267,6 +267,16 @@ gkrellm_set_chartdata_flags(GkrellmChartdata *cd, gint flags)
cd->flags = flags;
}
static void
gk_draw_vertical_line(GdkDrawable *drawable, GdkGC *gc, gint x, gint y1, gint y2)
{
if (y1 == y2)
gdk_draw_point(drawable, gc, x, y1);
else
gdk_draw_line(drawable, gc, x, y1, x, y2);
}
static gint
chartdata_ycoord(GkrellmChart *cp, GkrellmChartdata *cd, gint yd)
{
@ -413,7 +423,7 @@ draw_chartdata_impulses(GkrellmChart *cp, GList *cd_list,
yI += cd->data[x];
y = chartdata_ycoord(cp, cd, yI);
if (cd->data[x] > 0)
gdk_draw_line(cd->data_bitmap, _GK.bit1_GC, n, y1, n, y);
gk_draw_vertical_line(cd->data_bitmap, _GK.bit1_GC, n, y1, y);
y1 = y;
}
else
@ -423,7 +433,7 @@ draw_chartdata_impulses(GkrellmChart *cp, GList *cd_list,
yN += cd->data[x];
y = chartdata_ycoord(cp, cd, yN);
if (cd->data[x] > 0)
gdk_draw_line(cd->data_bitmap, _GK.bit1_GC, n, y0, n, y);
gk_draw_vertical_line(cd->data_bitmap, _GK.bit1_GC, n, y0, y);
y0 = y;
}
}
@ -501,11 +511,7 @@ draw_chartdata_lines(GkrellmChart *cp, GkrellmChartdata *cd, gint i0)
cd->y_p_valid = FALSE; /* Need a store_chartdata to make it valid */
if (cd->data[x] > 0 || (cd->inverted ? (y > y0) : (y < y0)))
{
if (y == y1)
gdk_draw_point(cd->data_bitmap, _GK.bit1_GC, cp->x + n, y1);
else
gdk_draw_line(cd->data_bitmap, _GK.bit1_GC,
cp->x + n, y, cp->x + n, y1);
gk_draw_vertical_line(cd->data_bitmap, _GK.bit1_GC, cp->x + n, y, y1);
}
}
/* Push the grided pixmap through the data bitmap onto the expose pixmap