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Assert that we have drawn the expected number of points

This commit is contained in:
Sam Lantinga 2022-01-08 11:07:03 -08:00
parent 9f56faeedc
commit 3da7c6305a
1 changed files with 4 additions and 2 deletions
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6
src/render/SDL_render.c
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@ -2789,7 +2789,7 @@ static int plotLineLow(SDL_Renderer *renderer, float x0, float y0, float x1, flo
float dy = y1 - y0; float dy = y1 - y0;
int yi = 1; int yi = 1;
float x, y, D; float x, y, D;
int count = (x1 - x0 + 1); int count = (int)SDL_ceilf(x1 - x0 + 1);
SDL_bool isstack; SDL_bool isstack;
SDL_FPoint *points = SDL_small_alloc(SDL_FPoint, count, &isstack); SDL_FPoint *points = SDL_small_alloc(SDL_FPoint, count, &isstack);
SDL_FPoint *tmp = points; SDL_FPoint *tmp = points;
@ -2812,6 +2812,7 @@ static int plotLineLow(SDL_Renderer *renderer, float x0, float y0, float x1, flo
D += 2*dy; D += 2*dy;
} }
} }
SDL_assert((tmp - points) == count);
if (renderer->scale.x != 1.0f || renderer->scale.y != 1.0f) { if (renderer->scale.x != 1.0f || renderer->scale.y != 1.0f) {
retval = RenderDrawPointsWithRectsF(renderer, points, count); 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; float dy = y1 - y0;
int xi = 1; int xi = 1;
float x, y, D; float x, y, D;
int count = (y1 - y0 + 1); int count = (int)SDL_ceilf(y1 - y0 + 1);
SDL_bool isstack; SDL_bool isstack;
SDL_FPoint *points = SDL_small_alloc(SDL_FPoint, count, &isstack); SDL_FPoint *points = SDL_small_alloc(SDL_FPoint, count, &isstack);
SDL_FPoint *tmp = points; SDL_FPoint *tmp = points;
@ -2854,6 +2855,7 @@ static int plotLineHigh(SDL_Renderer *renderer, float x0, float y0, float x1, fl
D += 2*dx; D += 2*dx;
} }
} }
SDL_assert((tmp - points) == count);
if (renderer->scale.x != 1.0f || renderer->scale.y != 1.0f) { if (renderer->scale.x != 1.0f || renderer->scale.y != 1.0f) {
retval = RenderDrawPointsWithRectsF(renderer, points, count); retval = RenderDrawPointsWithRectsF(renderer, points, count);