[PATCH 1/2] wined3d: Avoid division by zero in wined3d_format_get_float_color_key().

[Elizabeth Figura]

From: Elizabeth Figura

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=56969
---
 dlls/wined3d/utils.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/dlls/wined3d/utils.c b/dlls/wined3d/utils.c
index 71b629da50e..27abbeb574e 100644
--- a/dlls/wined3d/utils.c
+++ b/dlls/wined3d/utils.c
@@ -6111,7 +6111,7 @@ static float color_to_float(DWORD color, DWORD size, DWORD offset)
 void wined3d_format_get_float_color_key(const struct wined3d_format *format,
         const struct wined3d_color_key *key, struct wined3d_color *float_colors)
 {
-    struct wined3d_color slop;
+    struct wined3d_color slop = {INFINITY, INFINITY, INFINITY, INFINITY};

switch (format->id)
     {
@@ -6133,10 +6133,14 @@ void wined3d_format_get_float_color_key(const struct wined3d_format *format,
         case WINED3DFMT_R8G8B8X8_UNORM:
         case WINED3DFMT_R16G16_UNORM:
         case WINED3DFMT_B10G10R10A2_UNORM:
-            slop.r = 0.5f / wined3d_mask_from_size(format->red_size);
-            slop.g = 0.5f / wined3d_mask_from_size(format->green_size);
-            slop.b = 0.5f / wined3d_mask_from_size(format->blue_size);
-            slop.a = 0.5f / wined3d_mask_from_size(format->alpha_size);
+            if (format->red_size)
+                slop.r = 0.5f / wined3d_mask_from_size(format->red_size);
+            if (format->green_size)
+                slop.g = 0.5f / wined3d_mask_from_size(format->green_size);
+            if (format->blue_size)
+                slop.b = 0.5f / wined3d_mask_from_size(format->blue_size);
+            if (format->alpha_size)
+                slop.a = 0.5f / wined3d_mask_from_size(format->alpha_size);

float_colors[0].r = color_to_float(key->color_space_low_value, format->red_size, format->red_offset)
                     - slop.r;