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ImDrawList: fixed AddCircle, AddCircleFilled buffer read overflow with (rad > 0.0f && rad < 1.0f && num_segments == 0). (#3738)

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Amend 051ce076. Maximum cached count becomes 63 instead of 64.
This commit is contained in:
ocornut
2021-01-25 14:58:52 +01:00
parent 58075c4414
commit f144c67676
5 changed files with 19 additions and 6 deletions
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3
imgui_internal.h
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@ -610,6 +610,7 @@ struct IMGUI_API ImChunkStream
//-----------------------------------------------------------------------------
// ImDrawList: Helper function to calculate a circle's segment count given its radius and a "maximum error" value.
// FIXME: the minimum number of auto-segment may be undesirably high for very small radiuses (e.g. 1.0f)
#define IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_MIN 12
#define IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_MAX 512
#define IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_CALC(_RAD,_MAXERROR) ImClamp((int)((IM_PI * 2.0f) / ImAcos(((_RAD) - (_MAXERROR)) / (_RAD))), IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_MIN, IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_MAX)
@ -633,7 +634,7 @@ struct IMGUI_API ImDrawListSharedData
// [Internal] Lookup tables
ImVec2 ArcFastVtx[12 * IM_DRAWLIST_ARCFAST_TESSELLATION_MULTIPLIER]; // FIXME: Bake rounded corners fill/borders in atlas
ImU8 CircleSegmentCounts[64]; // Precomputed segment count for given radius (array index + 1) before we calculate it dynamically (to avoid calculation overhead)
ImU8 CircleSegmentCounts[64]; // Precomputed segment count for given radius before we calculate it dynamically (to avoid calculation overhead)
const ImVec4* TexUvLines; // UV of anti-aliased lines in the atlas
ImDrawListSharedData();