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DrawList: added ImDrawListFlags_NoTextPixelSnap to disable snapping of AddText() coordinates for a given scope. (#3437, #9417, #2291)

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This may evolve into a per-call ImDrawFlags option as well.
+ clip_rect.Max.y early out may be applied before truncation.
This commit is contained in:
ocornut
2026-05-29 18:10:29 +02:00
parent 75f985998b
commit 1d33ea939f
3 changed files with 22 additions and 9 deletions
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20
imgui_draw.cpp
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@@ -5764,8 +5764,13 @@ void ImFont::RenderChar(ImDrawList* draw_list, float size, const ImVec2& pos, Im
if (glyph->Colored)
col |= ~IM_COL32_A_MASK;
float scale = (size >= 0.0f) ? (size / baked->Size) : 1.0f;
float x = IM_TRUNC(pos.x);
float y = IM_TRUNC(pos.y);
float x = pos.x;
float y = pos.y;
if ((draw_list->Flags & ImDrawListFlags_NoTextPixelSnap) == 0)
{
x = IM_TRUNC(x);
y = IM_TRUNC(y);
}
float x1 = x + glyph->X0 * scale;
float x2 = x + glyph->X1 * scale;
@@ -5797,12 +5802,17 @@ void ImFont::RenderChar(ImDrawList* draw_list, float size, const ImVec2& pos, Im
// DO NOT CALL DIRECTLY THIS WILL CHANGE WILDLY IN 2026. Use ImDrawList::AddText().
void ImFont::RenderText(ImDrawList* draw_list, float size, const ImVec2& pos, ImU32 col, const ImVec4& clip_rect, const char* text_begin, const char* text_end, float wrap_width, ImDrawTextFlags flags)
{
// Align to be pixel perfect
begin:
float x = IM_TRUNC(pos.x);
float y = IM_TRUNC(pos.y);
// Align to be pixel perfect
float x = pos.x;
float y = pos.y;
if (y > clip_rect.w)
return;
if ((draw_list->Flags & ImDrawListFlags_NoTextPixelSnap) == 0)
{
x = IM_TRUNC(x);
y = IM_TRUNC(y);
}
if (!text_end)
text_end = text_begin + ImStrlen(text_begin); // ImGui:: functions generally already provides a valid text_end, so this is merely to handle direct calls.