Function ImFontAtlasTextureBlockCopy

src/imgui/imgui_draw.cpp:2929–2939

Copy block from one texture to another

// Copy block from one texture to another
void ImFontAtlasTextureBlockCopy(ImTextureData* src_tex, int src_x, int src_y, ImTextureData* dst_tex, int dst_x, int dst_y, int w, int h)
{
    IM_ASSERT(src_tex->Pixels != NULL && dst_tex->Pixels != NULL);
    IM_ASSERT(src_tex->Format == dst_tex->Format);
    IM_ASSERT(src_x >= 0 && src_x + w <= src_tex->Width);
    IM_ASSERT(src_y >= 0 && src_y + h <= src_tex->Height);
    IM_ASSERT(dst_x >= 0 && dst_x + w <= dst_tex->Width);
    IM_ASSERT(dst_y >= 0 && dst_y + h <= dst_tex->Height);
    for (int y = 0; y < h; y++)
        memcpy(dst_tex->GetPixelsAt(dst_x, dst_y + y), src_tex->GetPixelsAt(src_x, src_y + y), w * dst_tex->BytesPerPixel);
}

// Queue texture block update for renderer backend
void ImFontAtlasTextureBlockQueueUpload(ImFontAtlas* atlas, ImTextureData* tex, int x, int y, int w, int h)