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avfilter/vf_waveform: make sure that x/y for text position is positive 

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2016-03-08 22:04:57 +01:00
parent 8ca2c872b6
commit 209cff2d9c
1 changed files with 18 additions and 8 deletions
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26
libavfilter/vf_waveform.c
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@ -1369,9 +1369,12 @@ static void graticule_green_row(WaveformContext *s, AVFrame *out)
}
for (l = 0; l < FF_ARRAY_ELEMS(lines[0]) && (s->flags & 1); l++) {
const int x = offset + (s->mirror ? 255 - lines[c][l] : lines[c][l]) - 10;
int x = offset + (s->mirror ? 255 - lines[c][l] : lines[c][l]) - 10;
char text[16];
if (x < 0)
x = 4;
snprintf(text, sizeof(text), "%d", lines[c][l]);
draw_vtext(out, x, 2, o1, o2, text, green_yuva_color);
}
@ -1403,9 +1406,12 @@ static void graticule16_green_row(WaveformContext *s, AVFrame *out)
}
for (l = 0; l < FF_ARRAY_ELEMS(lines[0]) && (s->flags & 1); l++) {
const int x = offset + (s->mirror ? s->size - 1 - lines[c][l] * mult : lines[c][l] * mult) - 10;
int x = offset + (s->mirror ? s->size - 1 - lines[c][l] * mult : lines[c][l] * mult) - 10;
char text[16];
if (x < 0)
x = 4;
snprintf(text, sizeof(text), "%d", lines[c][l] * mult);
draw_vtext16(out, x, 2, mult, o1, o2, text, green_yuva_color);
}
@ -1436,12 +1442,14 @@ static void graticule_green_column(WaveformContext *s, AVFrame *out)
}
for (l = 0; l < FF_ARRAY_ELEMS(lines[0]) && (s->flags & 1); l++) {
const int y = offset + (s->mirror ? 255 - lines[c][l] : lines[c][l]) - 10;
int y = offset + (s->mirror ? 255 - lines[c][l] : lines[c][l]) - 10;
char text[16];
if (y < 0)
y = 4;
snprintf(text, sizeof(text), "%d", lines[c][l]);
draw_htext(out, 2, y,
o1, o2, text, green_yuva_color);
draw_htext(out, 2, y, o1, o2, text, green_yuva_color);
}
offset += 256 * s->display;
@ -1471,12 +1479,14 @@ static void graticule16_green_column(WaveformContext *s, AVFrame *out)
}
for (l = 0; l < FF_ARRAY_ELEMS(lines[0]) && (s->flags & 1); l++) {
const int y = offset + (s->mirror ? s->size - 1 - lines[c][l] * mult : lines[c][l] * mult) - 10;
int y = offset + (s->mirror ? s->size - 1 - lines[c][l] * mult : lines[c][l] * mult) - 10;
char text[16];
if (y < 0)
y = 4;
snprintf(text, sizeof(text), "%d", lines[c][l] * mult);
draw_htext16(out, 2, y,
mult, o1, o2, text, green_yuva_color);
draw_htext16(out, 2, y, mult, o1, o2, text, green_yuva_color);
}
offset += s->size * s->display;