Function ImFontAtlasTextureBlockQueueUpload

src/imgui/imgui_draw.cpp:2942–2967

Queue texture block update for renderer backend

// Queue texture block update for renderer backend
void ImFontAtlasTextureBlockQueueUpload(ImFontAtlas* atlas, ImTextureData* tex, int x, int y, int w, int h)
{
    IM_ASSERT(tex->Status != ImTextureStatus_WantDestroy && tex->Status != ImTextureStatus_Destroyed);
    IM_ASSERT(x >= 0 && x <= 0xFFFF && y >= 0 && y <= 0xFFFF && w >= 0 && x + w <= 0x10000 && h >= 0 && y + h <= 0x10000);
    IM_UNUSED(atlas);

    ImTextureRect req = { (unsigned short)x, (unsigned short)y, (unsigned short)w, (unsigned short)h };
    int new_x1 = ImMax(tex->UpdateRect.w == 0 ? 0 : tex->UpdateRect.x + tex->UpdateRect.w, req.x + req.w);
    int new_y1 = ImMax(tex->UpdateRect.h == 0 ? 0 : tex->UpdateRect.y + tex->UpdateRect.h, req.y + req.h);
    tex->UpdateRect.x = ImMin(tex->UpdateRect.x, req.x);
    tex->UpdateRect.y = ImMin(tex->UpdateRect.y, req.y);
    tex->UpdateRect.w = (unsigned short)(new_x1 - tex->UpdateRect.x);
    tex->UpdateRect.h = (unsigned short)(new_y1 - tex->UpdateRect.y);
    tex->UsedRect.x = ImMin(tex->UsedRect.x, req.x);
    tex->UsedRect.y = ImMin(tex->UsedRect.y, req.y);
    tex->UsedRect.w = (unsigned short)(ImMax(tex->UsedRect.x + tex->UsedRect.w, req.x + req.w) - tex->UsedRect.x);
    tex->UsedRect.h = (unsigned short)(ImMax(tex->UsedRect.y + tex->UsedRect.h, req.y + req.h) - tex->UsedRect.y);
    atlas->TexIsBuilt = false;

    // No need to queue if status is == ImTextureStatus_WantCreate
    if (tex->Status == ImTextureStatus_OK || tex->Status == ImTextureStatus_WantUpdates)
    {
        tex->Status = ImTextureStatus_WantUpdates;
        tex->Updates.push_back(req);
    }
}

#ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
static void GetTexDataAsFormat(ImFontAtlas* atlas, ImTextureFormat format, unsigned char** out_pixels, int* out_width, int* out_height, int* out_bytes_per_pixel)