Getting all previous frames with STBImage.stbi_load_gif_from_memory

[D4ann]

Im loading a gif like this

public static Buffers getGifBuffer(@Nullable NativeImage.Format format, ByteBuffer buffer) throws IOException {
        if (format != null && !format.isWriteable()) {
            throw new UnsupportedOperationException("Don't know how to read format " + format);
        } else {
            MemoryStack memoryStack = MemoryStack.stackPush();
            try {
                IntBuffer intBuffer = memoryStack.mallocInt(1);
                IntBuffer intBuffer2 = memoryStack.mallocInt(1);
                IntBuffer intBuffer3 = memoryStack.mallocInt(1);
                IntBuffer intBuffer4 = memoryStack.mallocInt(1);
                PointerBuffer pointerBuffer = memoryStack.callocPointer(1);
                int form = format == null ? 0 : channel(format);
                ByteBuffer byteBuffer = STBImage.stbi_load_gif_from_memory(buffer, pointerBuffer, intBuffer, intBuffer2, intBuffer3, intBuffer4, form);
                if (byteBuffer == null) {
                    System.out.println(STBImage.stbi_failure_reason());
                    throw new IOException("Could not load image: " + STBImage.stbi_failure_reason());
                }
                return new Buffers(byteBuffer, intBuffer.get(0), intBuffer2.get(0), pointerBuffer.get(0), intBuffer4.get(0), form);
            } catch (Throwable var9) {
                if (memoryStack != null) {
                    try {
                        memoryStack.close();
                    } catch (Throwable var8) {
                        var9.addSuppressed(var8);
                    }
                }
                throw var9;
            }
        }
    }

then i try to render a frame of the gif using the pointer that i get like this

public static long getOffset(int width, int height, int frame_index, int channel_count) {
        return (long) width * height * frame_index * channel_count;
    }

but im getting the frame that im searching + all the previous ones.