Function ImFontAtlasBuildUpdateBasicTexData

src/imgui/imgui_draw.cpp:3476–3508

}

static void ImFontAtlasBuildUpdateBasicTexData(ImFontAtlas* atlas)
{
    // Pack and store identifier so we can refresh UV coordinates on texture resize.
    // FIXME-NEWATLAS: User/custom rects where user code wants to store UV coordinates will need to do the same thing.
    ImFontAtlasBuilder* builder = atlas->Builder;
    ImVec2i pack_size = (atlas->Flags & ImFontAtlasFlags_NoMouseCursors) ? ImVec2i(2, 2) : ImVec2i(FONT_ATLAS_DEFAULT_TEX_DATA_W * 2 + 1, FONT_ATLAS_DEFAULT_TEX_DATA_H);

    ImFontAtlasRect r;
    bool add_and_draw = (atlas->GetCustomRect(builder->PackIdMouseCursors, &r) == false);
    if (add_and_draw)
    {
        builder->PackIdMouseCursors = atlas->AddCustomRect(pack_size.x, pack_size.y, &r);
        IM_ASSERT(builder->PackIdMouseCursors != ImFontAtlasRectId_Invalid);

        // Draw to texture
        if (atlas->Flags & ImFontAtlasFlags_NoMouseCursors)
        {
            // 2x2 white pixels
            ImFontAtlasBuildRenderBitmapFromString(atlas, r.x, r.y, 2, 2, "XX" "XX", 'X');
        }
        else
        {
            // 2x2 white pixels + mouse cursors
            const int x_for_white = r.x;
            const int x_for_black = r.x + FONT_ATLAS_DEFAULT_TEX_DATA_W + 1;
            ImFontAtlasBuildRenderBitmapFromString(atlas, x_for_white, r.y, FONT_ATLAS_DEFAULT_TEX_DATA_W, FONT_ATLAS_DEFAULT_TEX_DATA_H, FONT_ATLAS_DEFAULT_TEX_DATA_PIXELS, '.');
            ImFontAtlasBuildRenderBitmapFromString(atlas, x_for_black, r.y, FONT_ATLAS_DEFAULT_TEX_DATA_W, FONT_ATLAS_DEFAULT_TEX_DATA_H, FONT_ATLAS_DEFAULT_TEX_DATA_PIXELS, 'X');
        }
    }

    // Refresh UV coordinates
    atlas->TexUvWhitePixel = ImVec2((r.x + 0.5f) * atlas->TexUvScale.x, (r.y + 0.5f) * atlas->TexUvScale.y);
}

static void ImFontAtlasBuildUpdateLinesTexData(ImFontAtlas* atlas)
{