diff --git a/app/src/control_msg.c b/app/src/control_msg.c index e78f0c57..e46c6165 100644 --- a/app/src/control_msg.c +++ b/app/src/control_msg.c @@ -127,10 +127,14 @@ sc_control_msg_serialize(const struct sc_control_msg *msg, uint8_t *buf) { return 32; case SC_CONTROL_MSG_TYPE_INJECT_SCROLL_EVENT: write_position(&buf[1], &msg->inject_scroll_event.position); - int16_t hscroll = - sc_float_to_i16fp(msg->inject_scroll_event.hscroll); - int16_t vscroll = - sc_float_to_i16fp(msg->inject_scroll_event.vscroll); + // Accept values in the range [-16, 16]. + // Normalize to [-1, 1] in order to use sc_float_to_i16fp(). + float hscroll_norm = msg->inject_scroll_event.hscroll / 16; + hscroll_norm = CLAMP(hscroll_norm, -1, 1); + float vscroll_norm = msg->inject_scroll_event.vscroll / 16; + vscroll_norm = CLAMP(vscroll_norm, -1, 1); + int16_t hscroll = sc_float_to_i16fp(hscroll_norm); + int16_t vscroll = sc_float_to_i16fp(vscroll_norm); sc_write16be(&buf[13], (uint16_t) hscroll); sc_write16be(&buf[15], (uint16_t) vscroll); sc_write32be(&buf[17], msg->inject_scroll_event.buttons); diff --git a/app/src/mouse_sdk.c b/app/src/mouse_sdk.c index 1b05d02b..7eceffa7 100644 --- a/app/src/mouse_sdk.c +++ b/app/src/mouse_sdk.c @@ -113,8 +113,8 @@ sc_mouse_processor_process_mouse_scroll(struct sc_mouse_processor *mp, .type = SC_CONTROL_MSG_TYPE_INJECT_SCROLL_EVENT, .inject_scroll_event = { .position = event->position, - .hscroll = CLAMP(event->hscroll, -1, 1), - .vscroll = CLAMP(event->vscroll, -1, 1), + .hscroll = event->hscroll, + .vscroll = event->vscroll, .buttons = convert_mouse_buttons(event->buttons_state), }, }; diff --git a/app/tests/test_control_msg_serialize.c b/app/tests/test_control_msg_serialize.c index af97182d..0d19919e 100644 --- a/app/tests/test_control_msg_serialize.c +++ b/app/tests/test_control_msg_serialize.c @@ -127,8 +127,8 @@ static void test_serialize_inject_scroll_event(void) { .height = 1920, }, }, - .hscroll = 1, - .vscroll = -1, + .hscroll = 16, + .vscroll = -16, .buttons = 1, }, }; @@ -141,8 +141,8 @@ static void test_serialize_inject_scroll_event(void) { SC_CONTROL_MSG_TYPE_INJECT_SCROLL_EVENT, 0x00, 0x00, 0x01, 0x04, 0x00, 0x00, 0x04, 0x02, // 260 1026 0x04, 0x38, 0x07, 0x80, // 1080 1920 - 0x7F, 0xFF, // 1 (float encoded as i16) - 0x80, 0x00, // -1 (float encoded as i16) + 0x7F, 0xFF, // 16 (float encoded as i16 in the range [-16, 16]) + 0x80, 0x00, // -16 (float encoded as i16 in the range [-16, 16]) 0x00, 0x00, 0x00, 0x01, // 1 }; assert(!memcmp(buf, expected, sizeof(expected))); diff --git a/server/src/main/java/com/genymobile/scrcpy/control/ControlMessageReader.java b/server/src/main/java/com/genymobile/scrcpy/control/ControlMessageReader.java index e503ec61..830a7ec7 100644 --- a/server/src/main/java/com/genymobile/scrcpy/control/ControlMessageReader.java +++ b/server/src/main/java/com/genymobile/scrcpy/control/ControlMessageReader.java @@ -112,8 +112,9 @@ public class ControlMessageReader { private ControlMessage parseInjectScrollEvent() throws IOException { Position position = parsePosition(); - float hScroll = Binary.i16FixedPointToFloat(dis.readShort()); - float vScroll = Binary.i16FixedPointToFloat(dis.readShort()); + // Binary.i16FixedPointToFloat() decodes values assuming the full range is [-1, 1], but the actual range is [-16, 16]. + float hScroll = Binary.i16FixedPointToFloat(dis.readShort()) * 16; + float vScroll = Binary.i16FixedPointToFloat(dis.readShort()) * 16; int buttons = dis.readInt(); return ControlMessage.createInjectScrollEvent(position, hScroll, vScroll, buttons); } diff --git a/server/src/test/java/com/genymobile/scrcpy/control/ControlMessageReaderTest.java b/server/src/test/java/com/genymobile/scrcpy/control/ControlMessageReaderTest.java index 74df064f..0cc0a6b5 100644 --- a/server/src/test/java/com/genymobile/scrcpy/control/ControlMessageReaderTest.java +++ b/server/src/test/java/com/genymobile/scrcpy/control/ControlMessageReaderTest.java @@ -125,7 +125,7 @@ public class ControlMessageReaderTest { dos.writeShort(1080); dos.writeShort(1920); dos.writeShort(0); // 0.0f encoded as i16 - dos.writeShort(0x8000); // -1.0f encoded as i16 + dos.writeShort(0x8000); // -16.0f encoded as i16 (the range is [-16, 16]) dos.writeInt(1); byte[] packet = bos.toByteArray(); @@ -139,7 +139,7 @@ public class ControlMessageReaderTest { Assert.assertEquals(1080, event.getPosition().getScreenSize().getWidth()); Assert.assertEquals(1920, event.getPosition().getScreenSize().getHeight()); Assert.assertEquals(0f, event.getHScroll(), 0f); - Assert.assertEquals(-1f, event.getVScroll(), 0f); + Assert.assertEquals(-16f, event.getVScroll(), 0f); Assert.assertEquals(1, event.getButtons()); Assert.assertEquals(-1, bis.read()); // EOS