Function ImFontAtlasBuildSetTexture

src/imgui/imgui_draw.cpp:3932–3940

Set current texture. This is mostly called from AddTexture() + to handle a failed resize.

// Set current texture. This is mostly called from AddTexture() + to handle a failed resize.
static void ImFontAtlasBuildSetTexture(ImFontAtlas* atlas, ImTextureData* tex)
{
    ImTextureRef old_tex_ref = atlas->TexRef;
    atlas->TexData = tex;
    atlas->TexUvScale = ImVec2(1.0f / tex->Width, 1.0f / tex->Height);
    atlas->TexRef._TexData = tex;
    //atlas->TexRef._TexID = tex->TexID; // <-- We intentionally don't do that. It would be misleading and betray promise that both fields aren't set.
    ImFontAtlasUpdateDrawListsTextures(atlas, old_tex_ref, atlas->TexRef);
}

// Create a new texture, discard previous one
ImTextureData* ImFontAtlasTextureAdd(ImFontAtlas* atlas, int w, int h)