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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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10
docs/CHANGELOG.txt
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@@ -50,15 +50,17 @@ Other Changes:
- Clicking on a window's empty-space to move/focus a window checks
for lack of queued focus request. (#9382)
- InputText:
- Added style.InputTextCursorSize to configure cursor/caret thickness. (#7031, #9409)
This is automatically scaled by style.ScaleAllSizes().
- Added `style.InputTextCursorSize` to configure cursor/caret thickness. (#7031, #9409)
This is automatically scaled by `style.ScaleAllSizes()`.
- Fonts:
- Added `IMGUI_DISABLE_DEFAULT_FONT_BITMAP`/`IMGUI_DISABLE_DEFAULT_FONT_VECTOR` to
disable embedding either fonts separately. (#9407)
- Tweak CalcTextSize() awkward width rounding/ceiling code to reduce floating-point
- Tweak `CalcTextSize()` awkward width rounding/ceiling code to reduce floating-point
imprecisions altering the result by 1 even at relatively small width. (#791)
- DrawList:
- Minor optimization to AddLine(), AddLineH(), AddLineV() functions. (#4091)
- Minor optimization to `AddLine()`, `AddLineH()`, `AddLineV()` functions. (#4091)
- Added `ImDrawListFlags_NoTextPixelSnap` to disable snapping of AddText()
coordinates for a given scope. (#3437, #9417, #2291)
- Demo:
- Extract 'Widgets->Tree Nodes->Selectable Nodes' out of the 'Advanced'
demo for clarity (manual reimplementation of basic selection).

1
imgui.h
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@@ -3279,6 +3279,7 @@ enum ImDrawListFlags_
ImDrawListFlags_AntiAliasedLinesUseTex = 1 << 1, // Enable anti-aliased lines/borders using textures when possible. Require backend to render with bilinear filtering (NOT point/nearest filtering).
ImDrawListFlags_AntiAliasedFill = 1 << 2, // Enable anti-aliased edge around filled shapes (rounded rectangles, circles).
ImDrawListFlags_AllowVtxOffset = 1 << 3, // Can emit 'VtxOffset > 0' to allow large meshes. Set when 'ImGuiBackendFlags_RendererHasVtxOffset' is enabled.
ImDrawListFlags_NoTextPixelSnap = 1 << 4, // [Internal] Disable automatically snapping AddText() calls to pixel boundaries.
};
// Draw command list

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.