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-rw-r--r--payloads/libpayload/drivers/video/graphics.c50
1 files changed, 40 insertions, 10 deletions
diff --git a/payloads/libpayload/drivers/video/graphics.c b/payloads/libpayload/drivers/video/graphics.c
index ea10f131da..81d2bb9e55 100644
--- a/payloads/libpayload/drivers/video/graphics.c
+++ b/payloads/libpayload/drivers/video/graphics.c
@@ -72,6 +72,35 @@ static int is_valid_fraction(const struct fraction *f)
return f->d != 0;
}
+static int is_valid_scale(const struct scale *s)
+{
+ return is_valid_fraction(&s->x) && is_valid_fraction(&s->y);
+}
+
+static void add_fractions(struct fraction *out,
+ const struct fraction *f1, const struct fraction *f2)
+{
+ int64_t n, d;
+ int shift;
+ n = (int64_t)f1->n * f2->d + (int64_t)f2->n * f1->d;
+ d = (int64_t)f1->d * f2->d;
+ /* Simplest way to reduce the fraction until fitting in int32_t */
+ shift = log2(MAX(ABS(n), ABS(d)) >> 31);
+ if (shift > 0) {
+ n >>= shift;
+ d >>= shift;
+ }
+ out->n = n;
+ out->d = d;
+}
+
+static void add_scales(struct scale *out,
+ const struct scale *s1, const struct scale *s2)
+{
+ add_fractions(&out->x, &s1->x, &s2->x);
+ add_fractions(&out->y, &s1->y, &s2->y);
+}
+
/*
* Transform a vector:
* x' = x * a_x + offset_x
@@ -82,7 +111,7 @@ static int transform_vector(struct vector *out,
const struct scale *a,
const struct vector *offset)
{
- if (!is_valid_fraction(&a->x) || !is_valid_fraction(&a->y))
+ if (!is_valid_scale(a))
return CBGFX_ERROR_INVALID_PARAMETER;
out->x = a->x.n * in->x / a->x.d + offset->x;
out->y = a->y.n * in->y / a->y.d + offset->y;
@@ -211,7 +240,6 @@ static int cbgfx_init(void)
int draw_box(const struct rect *box, const struct rgb_color *rgb)
{
struct vector top_left;
- struct vector size;
struct vector p, t;
if (cbgfx_init())
@@ -222,14 +250,13 @@ int draw_box(const struct rect *box, const struct rgb_color *rgb)
.x = { .n = box->offset.x, .d = CANVAS_SCALE, },
.y = { .n = box->offset.y, .d = CANVAS_SCALE, }
};
- const struct scale size_s = {
- .x = { .n = box->size.x, .d = CANVAS_SCALE, },
- .y = { .n = box->size.y, .d = CANVAS_SCALE, }
+ const struct scale bottom_right_s = {
+ .x = { .n = box->offset.x + box->size.x, .d = CANVAS_SCALE, },
+ .y = { .n = box->offset.y + box->size.y, .d = CANVAS_SCALE, }
};
transform_vector(&top_left, &canvas.size, &top_left_s, &canvas.offset);
- transform_vector(&size, &canvas.size, &size_s, &vzero);
- add_vectors(&t, &top_left, &size);
+ transform_vector(&t, &canvas.size, &bottom_right_s, &canvas.offset);
if (within_box(&t, &canvas) < 0) {
LOG("Box exceeds canvas boundary\n");
return CBGFX_ERROR_BOUNDARY;
@@ -247,8 +274,8 @@ int draw_rounded_box(const struct scale *pos_rel, const struct scale *dim_rel,
const struct fraction *thickness,
const struct fraction *radius)
{
+ struct scale pos_end_rel;
struct vector top_left;
- struct vector size;
struct vector p, t;
if (cbgfx_init())
@@ -256,9 +283,12 @@ int draw_rounded_box(const struct scale *pos_rel, const struct scale *dim_rel,
const uint32_t color = calculate_color(rgb, 0);
+ if (!is_valid_scale(pos_rel) || !is_valid_scale(dim_rel))
+ return CBGFX_ERROR_INVALID_PARAMETER;
+
+ add_scales(&pos_end_rel, pos_rel, dim_rel);
transform_vector(&top_left, &canvas.size, pos_rel, &canvas.offset);
- transform_vector(&size, &canvas.size, dim_rel, &vzero);
- add_vectors(&t, &top_left, &size);
+ transform_vector(&t, &canvas.size, &pos_end_rel, &canvas.offset);
if (within_box(&t, &canvas) < 0) {
LOG("Box exceeds canvas boundary\n");
return CBGFX_ERROR_BOUNDARY;