Imgui: [Question]CEF Off-Screen-Rendering + ImGUI

[Centurius123]

Hello guys,

I have a Question. Is it possible to add CEF into a ImGUI Window?

I get on the CEF onPaint Function a buffer and can I at this buffer into a ImGUI Window?
void CEFView::OnPaint(CefRefPtr<CefBrowser> browser, CefRenderHandler::PaintElementType paintType, const CefRenderHandler::RectList& dirtyRects, const void* buffer, int width, int height)

[ocornut]

I have no idea what CEF is. Please clarify the question and the context.

You can use AddImage() to render anything that your imgui renderer wants to handle, and you can use render callbacks as well.

On 13 May 2017, at 12:09, Centurius123 [e-mail] wrote:

Hello guys,

I have a Question. Is it possible to add CEF into a ImGUI Window?

I get on the CEF onPaint Function a buffer and can I at this buffer into a ImGUI Window?
void CEFView::OnPaint(CefRefPtr browser, CefRenderHandler::PaintElementType paintType, const CefRenderHandler::RectList& dirtyRects, const void* buffer, int width, int height)

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[Centurius123]

Ohh sorry!
CEF -> Chromium Embedded Framework
https://bitbucket.org/chromiumembedded/cef

I try to open a Website and draw this Website into a ImGUI Window

[ocornut]

So the most typical approach would be to render CEF into a texture, which may already be the case.

Then depending on how your imgui renderer loop handle ImTextureId you can pass the information of this texture to eg AddImage().
ImTextureId is basically a void* type can you use to pass texture/material information from your app code to your renderer code.

[Centurius123]

I try to use ImGUI::Image, but my game crashs.
I can write the buffer into a bmp file, but I dont know how I create a Image with the buffer into a ImGUI Window

[ocornut]

If something crash please specify exactly why and in which condition.

Uploading a texture to your renderer/engine is up to you, it's generally a simple/common task. If you are using one of the stock imgui_impl_xxx.cpp examples so you can see how they upload textures. For example OpenGL uses glGenTextures+glBindTexture+glTexImage2D

[Centurius123]

I use dx11
How I draw a Bitmap?

[ocornut]

You upload it into a texture and pass this texture pointer to AddImage().

[Centurius123]

Do you have an example for addimage?

[ocornut]

Use
ImGui::Image(ID3D11ShaderResourceView* id, ImVec2 size);

ImTextureID = ID3D11ShaderResourceView* if you are using imgui_impl_dx11.cpp renderer.

[rafadsm]

I was looking for it!
Is it possible to use ImGui to render the buffer using DX9?
I tried using ImGui :: Image and drawlist-> addimage, but crash

• |buffer| contains the pixel data for the whole image
• |buffer| will be width * height * 4 bytes in size and represents a BGRA image

[ocornut]

Please provide your code snippet.
Please provide info about the crash.

On 17 May 2017, at 01:33, rafadsm20 [e-mail] wrote:

I was looking for it!
Is it possible to use ImGui to render the buffer using DX9?
I tried using ImGui :: Image and drawlist-> addimage, but crash

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[rafadsm]

My code:

static class CefDelegate
{
public:
    void OnPaint(CefRefPtr<CefBrowser> browser,
    CefRenderHandler::PaintElementType type,
    const CefRenderHandler::RectList& dirtyRects,
    const void* buffer, int width, int height)
    {
        ImGui_ImplDX9_NewFrame();       
        ImGui::SetNextWindowSize(ImVec2(width, height), ImGuiSetCond_FirstUseEver);
        ImGui::SetNextWindowPos(ImVec2(0, 0));
        if (!ImGui::Begin("Cef Frame", 0, ImVec2(0, 0), 0.0f, ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoSavedSettings))
        {
            ImGui::End();
            return;
        }       
        ImDrawList* draw_list = ImGui::GetWindowDrawList();
        draw_list->AddImage(&buffer, ImVec2(0, 0), ImVec2(width, height));      
        /*
        or
        ImGui::Image(&buffer, ImVec2(width, height));
        */      
        ImGui::End();       
        RGetDevice()->SetRenderState(D3DRS_ZENABLE, false);
        RGetDevice()->SetRenderState(D3DRS_ALPHABLENDENABLE, false);
        RGetDevice()->SetRenderState(D3DRS_SCISSORTESTENABLE, false);
        ImGui::Render();
    }
};

Visual Studio ScreenShot
https://prnt.sc/f8wrod
DX9 version

I also tried to store a buffer in a texture using:

In Definitions
IDirect3DTexture9* tx;
In Init
RGetDevice()->CreateTexture(RGetScreenWidth(), RGetScreenHeight(), 1, 0, D3DFMT_A4R4G4B4, D3DPOOL_MANAGED, &tx, NULL);

In OnPaint:

D3DLOCKED_RECT d3dLockedRect;
tx->LockRect(0, &d3dLockedRect, 0, 0);
memcpy(d3dLockedRect.pBits, buffer, width *height* 4);
tx->UnlockRect(0);

In Draw Function:

draw_list->AddImage(tx, ImVec2(0, 0), ImVec2(width, height));
or
ImGui::Image(tx, ImVec2(width, height));

OnPaint API Docs: http://magpcss.org/ceforum/apidocs/projects/(default)/CefRenderHandler.html#OnPaint(CefRefPtr,PaintElementType,constRectList&,constvoid*)

[ocornut]

Is &buffer a LPDIRECT3DTEXTURE9, aka buffer of DIRECT3DTEXTURE9 type?
Read the rendering code ImGui_ImplDX9_RenderDrawLists to understand what is happening. Whatever you are passing to ImGui::Image or ImDrawList::AddImage() is passed to that render loop,
g_pd3dDevice->SetTexture(0, (LPDIRECT3DTEXTURE9)pcmd->TextureId);

Also this (bool*)true passed on Begin makes no sense. Pass a NULL pointer if you don't have a bool to store the state of whether the window is open or not. You are passing an invalid pointer (pointer to 0x00000001) which is going to crash whenever imgui tries to write there.

PS: When posting attachment, please use the github attachment system.

[rafadsm]

• Is &buffer a LPDIRECT3DTEXTURE9, aka buffer of DIRECT3DTEXTURE9 type?
  No, the documentation says it contains pixel data for the entire image
  "|buffer| contains the pixel data for the whole image"

• PS: When posting attachment, please use the github attachment system.
  I apologize, I did, but the attached image did not open, so I sent

Could you help me convert the buffer to an IDirect3DTexture9 texture?
I tried using:
My application freezes and crashes using this

D3DLOCKED_RECT d3dLockedRect;
tx->LockRect(0, &d3dLockedRect, 0, 0);
memcpy(d3dLockedRect.pBits, buffer, width *height* 4);
tx->UnlockRect(0);

• Buffer Documentation:
  |buffer| will be width * height *4 bytes in size and represents a BGRA image
  |buffer| contains the pixel data for the whole image

[ocornut]

Could you help me convert the buffer to an IDirect3DTexture9 texture?

Sorry this question has nothing to do with imgui. Try to look up the answer elsewhere.

[Centurius123]

Try to use CreateDDSTextureFromMemory()