From 3da7c6305ac0c6fe6289f29d92fd993a4ca9a653 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Sat, 8 Jan 2022 11:07:03 -0800
Subject: [PATCH] Assert that we have drawn the expected number of points
---
src/render/SDL_render.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/src/render/SDL_render.c b/src/render/SDL_render.c
index dcef14ae44c..299af227930 100644
--- a/src/render/SDL_render.c
+++ b/src/render/SDL_render.c
@@ -2789,7 +2789,7 @@ static int plotLineLow(SDL_Renderer *renderer, float x0, float y0, float x1, flo
float dy = y1 - y0;
int yi = 1;
float x, y, D;
- int count = (x1 - x0 + 1);
+ int count = (int)SDL_ceilf(x1 - x0 + 1);
SDL_bool isstack;
SDL_FPoint *points = SDL_small_alloc(SDL_FPoint, count, &isstack);
SDL_FPoint *tmp = points;
@@ -2812,6 +2812,7 @@ static int plotLineLow(SDL_Renderer *renderer, float x0, float y0, float x1, flo
D += 2*dy;
}
}
+ SDL_assert((tmp - points) == count);
if (renderer->scale.x != 1.0f || renderer->scale.y != 1.0f) {
retval = RenderDrawPointsWithRectsF(renderer, points, count);
@@ -2831,7 +2832,7 @@ static int plotLineHigh(SDL_Renderer *renderer, float x0, float y0, float x1, fl
float dy = y1 - y0;
int xi = 1;
float x, y, D;
- int count = (y1 - y0 + 1);
+ int count = (int)SDL_ceilf(y1 - y0 + 1);
SDL_bool isstack;
SDL_FPoint *points = SDL_small_alloc(SDL_FPoint, count, &isstack);
SDL_FPoint *tmp = points;
@@ -2854,6 +2855,7 @@ static int plotLineHigh(SDL_Renderer *renderer, float x0, float y0, float x1, fl
D += 2*dx;
}
}
+ SDL_assert((tmp - points) == count);
if (renderer->scale.x != 1.0f || renderer->scale.y != 1.0f) {
retval = RenderDrawPointsWithRectsF(renderer, points, count);