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-rw-r--r--payloads/libpayload/drivers/video/graphics.c27
1 files changed, 13 insertions, 14 deletions
diff --git a/payloads/libpayload/drivers/video/graphics.c b/payloads/libpayload/drivers/video/graphics.c
index 2bf5e19d88..563f2961c7 100644
--- a/payloads/libpayload/drivers/video/graphics.c
+++ b/payloads/libpayload/drivers/video/graphics.c
@@ -858,24 +858,25 @@ static int draw_bitmap_v3(const struct vector *top_left,
}
/*
- * Initialize the sample array for this line. For pixels to the
- * left of S0 there are no corresponding input pixels so just
- * copy the S0 values over.
- *
- * Also initialize the equals counter, which counts how many of
- * the latest pixels were exactly equal. We know the columns
- * left of S0 must be equal to S0, so start with that number.
+ * Initialize the sample array for this line, and also
+ * the equals counter, which counts how many of the latest
+ * pixels were exactly equal.
*/
- int equals = S0 * SSZ;
+ int equals = 0;
uint8_t last_equal = ypix[0][0];
- for (sy = 0; sy < SSZ; sy++) {
- for (sx = S0; sx < SSZ; sx++) {
- if (sx >= dim_org->width) {
+ for (sx = 0; sx < SSZ; sx++) {
+ for (sy = 0; sy < SSZ; sy++) {
+ if (sx - S0 >= dim_org->width) {
sample[sx][sy] = sample[sx - 1][sy];
equals++;
continue;
}
- uint8_t i = ypix[sy][sx - S0];
+ /*
+ * For pixels to the left of S0 there are no
+ * corresponding input pixels so just use
+ * ypix[sy][0].
+ */
+ uint8_t i = ypix[sy][MAX(0, sx - S0)];
if (pal_to_rgb(i, pal, header->colors_used,
&sample[sx][sy]))
goto bitmap_error;
@@ -886,8 +887,6 @@ static int draw_bitmap_v3(const struct vector *top_left,
equals = 1;
}
}
- for (sx = S0 - 1; sx >= 0; sx--)
- sample[sx][sy] = sample[S0][sy];
}
ix = 0;