Function ImFontAtlasTextureBlockFill

src/imgui/imgui_draw.cpp:2909–2926

Fill with single color. We don't use this directly but it is convenient for anyone working on uploading custom rects.

// Fill with single color. We don't use this directly but it is convenient for anyone working on uploading custom rects.
void ImFontAtlasTextureBlockFill(ImTextureData* dst_tex, int dst_x, int dst_y, int w, int h, ImU32 col)
{
    if (dst_tex->Format == ImTextureFormat_Alpha8)
    {
        ImU8 col_a = (col >> IM_COL32_A_SHIFT) & 0xFF;
        for (int y = 0; y < h; y++)
            memset((ImU8*)dst_tex->GetPixelsAt(dst_x, dst_y + y), col_a, w);
    }
    else
    {
        for (int y = 0; y < h; y++)
        {
            ImU32* p = (ImU32*)(void*)dst_tex->GetPixelsAt(dst_x, dst_y + y);
            for (int x = w; x > 0; x--, p++)
                *p = col;
        }
    }
}

// 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)