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ImFont: added cpu clip fine option for ImFont::RenderChar() (which is technically internal).

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(toward #7024)
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ocornut
2025-04-16 20:21:23 +02:00
parent faea193800
commit e4a865177e
2 changed files with 26 additions and 3 deletions
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2
imgui.h
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@@ -3532,7 +3532,7 @@ struct ImFont
// 'wrap_width' enable automatic word-wrapping across multiple lines to fit into given width. 0.0f to disable.
IMGUI_API ImVec2 CalcTextSizeA(float size, float max_width, float wrap_width, const char* text_begin, const char* text_end = NULL, const char** remaining = NULL); // utf8
IMGUI_API const char* CalcWordWrapPositionA(float scale, const char* text, const char* text_end, float wrap_width);
IMGUI_API void RenderChar(ImDrawList* draw_list, float size, const ImVec2& pos, ImU32 col, ImWchar c);
IMGUI_API void RenderChar(ImDrawList* draw_list, float size, const ImVec2& pos, ImU32 col, ImWchar c, const ImVec4* cpu_fine_clip = NULL);
IMGUI_API void 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 = 0.0f, bool cpu_fine_clip = false);
// [Internal] Don't use!

27
imgui_draw.cpp
View File

@@ -4113,7 +4113,7 @@ ImVec2 ImFont::CalcTextSizeA(float size, float max_width, float wrap_width, cons
}
// Note: as with every ImDrawList drawing function, this expects that the font atlas texture is bound.
void ImFont::RenderChar(ImDrawList* draw_list, float size, const ImVec2& pos, ImU32 col, ImWchar c)
void ImFont::RenderChar(ImDrawList* draw_list, float size, const ImVec2& pos, ImU32 col, ImWchar c, const ImVec4* cpu_fine_clip)
{
const ImFontGlyph* glyph = FindGlyph(c);
if (!glyph || !glyph->Visible)
@@ -4123,8 +4123,31 @@ void ImFont::RenderChar(ImDrawList* draw_list, float size, const ImVec2& pos, Im
float scale = (size >= 0.0f) ? (size / FontSize) : 1.0f;
float x = IM_TRUNC(pos.x);
float y = IM_TRUNC(pos.y);
float x1 = x + glyph->X0 * scale;
float x2 = x + glyph->X1 * scale;
if (cpu_fine_clip && (x1 > cpu_fine_clip->z || x2 < cpu_fine_clip->x))
return;
float y1 = y + glyph->Y0 * scale;
float y2 = y + glyph->Y1 * scale;
float u1 = glyph->U0;
float v1 = glyph->V0;
float u2 = glyph->U1;
float v2 = glyph->V1;
// Always CPU fine clip. Code extracted from RenderText().
// CPU side clipping used to fit text in their frame when the frame is too small. Only does clipping for axis aligned quads.
if (cpu_fine_clip != NULL)
{
if (x1 < cpu_fine_clip->x) { u1 = u1 + (1.0f - (x2 - cpu_fine_clip->x) / (x2 - x1)) * (u2 - u1); x1 = cpu_fine_clip->x; }
if (y1 < cpu_fine_clip->y) { v1 = v1 + (1.0f - (y2 - cpu_fine_clip->y) / (y2 - y1)) * (v2 - v1); y1 = cpu_fine_clip->y; }
if (x2 > cpu_fine_clip->z) { u2 = u1 + ((cpu_fine_clip->z - x1) / (x2 - x1)) * (u2 - u1); x2 = cpu_fine_clip->z; }
if (y2 > cpu_fine_clip->w) { v2 = v1 + ((cpu_fine_clip->w - y1) / (y2 - y1)) * (v2 - v1); y2 = cpu_fine_clip->w; }
if (y1 >= y2)
return;
}
draw_list->PrimReserve(6, 4);
draw_list->PrimRectUV(ImVec2(x + glyph->X0 * scale, y + glyph->Y0 * scale), ImVec2(x + glyph->X1 * scale, y + glyph->Y1 * scale), ImVec2(glyph->U0, glyph->V0), ImVec2(glyph->U1, glyph->V1), col);
draw_list->PrimRectUV(ImVec2(x1, y1), ImVec2(x2, y2), ImVec2(u1, v1), ImVec2(u2, v2), col);
}
// Note: as with every ImDrawList drawing function, this expects that the font atlas texture is bound.