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Prevent divide by zero

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This commit is contained in:
twinaphex 2016-09-24 17:08:46 +02:00
parent 764a4319a0
commit 49a9f189e9
1 changed files with 11 additions and 4 deletions
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15
input/input_driver.c
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@ -386,13 +386,20 @@ bool input_translate_coord_viewport(int mouse_x, int mouse_y,
int16_t *res_screen_y)
{
int scaled_screen_x, scaled_screen_y, scaled_x, scaled_y;
int norm_full_vp_width, norm_full_vp_height;
struct video_viewport vp = {0};
if (!video_driver_get_viewport_info(&vp))
return false;
scaled_screen_x = (2 * mouse_x * 0x7fff) / (int)vp.full_width - 0x7fff;
scaled_screen_y = (2 * mouse_y * 0x7fff) / (int)vp.full_height - 0x7fff;
norm_full_vp_width = (int)vp.full_width;
norm_full_vp_height = (int)vp.full_height;
if (norm_full_vp_width <= 0 || norm_full_vp_height <= 0)
return false;
scaled_screen_x = (2 * mouse_x * 0x7fff) / norm_full_vp_width - 0x7fff;
scaled_screen_y = (2 * mouse_y * 0x7fff) / norm_full_vp_height - 0x7fff;
if (scaled_screen_x < -0x7fff || scaled_screen_x > 0x7fff)
scaled_screen_x = -0x8000; /* OOB */
if (scaled_screen_y < -0x7fff || scaled_screen_y > 0x7fff)
@ -401,8 +408,8 @@ bool input_translate_coord_viewport(int mouse_x, int mouse_y,
mouse_x -= vp.x;
mouse_y -= vp.y;
scaled_x = (2 * mouse_x * 0x7fff) / (int)vp.width - 0x7fff;
scaled_y = (2 * mouse_y * 0x7fff) / (int)vp.height - 0x7fff;
scaled_x = (2 * mouse_x * 0x7fff) / norm_full_vp_width - 0x7fff;
scaled_y = (2 * mouse_y * 0x7fff) / norm_full_vp_height - 0x7fff;
if (scaled_x < -0x7fff || scaled_x > 0x7fff)
scaled_x = -0x8000; /* OOB */
if (scaled_y < -0x7fff || scaled_y > 0x7fff)