From 381858b82c5197193ba2f490a8282149536a54f7 Mon Sep 17 00:00:00 2001
From: Sven Gothel <sgothel@jausoft.com>
Date: Fri, 29 Nov 2019 07:32:52 +0100
Subject: Bug 1156: DRM/GBM: Add full PointerIcon (Cursor) Support

DRM allows 64x64 pixel cursor images, using GBM_FORMAT_ARGB888 only.

Notable: GBM_FORMAT_ARGB888 == PixelFormat.BGRA8888

Having fixed mouse and keyboard input with previous commit,
the demo com.jogamp.opengl.test.junit.jogl.demos.es2.newt.TestGearsES2NEWT
shows via key press
- i -> pointer visible/invisible
- c -> pointer icon change
---
 src/newt/native/drm_gbm.c | 105 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 105 insertions(+)

(limited to 'src/newt/native/drm_gbm.c')

diff --git a/src/newt/native/drm_gbm.c b/src/newt/native/drm_gbm.c
index 93b02dbe7..fd1879d88 100644
--- a/src/newt/native/drm_gbm.c
+++ b/src/newt/native/drm_gbm.c
@@ -49,6 +49,111 @@ JNIEXPORT void JNICALL Java_jogamp_newt_driver_egl_gbm_DisplayDriver_DispatchMes
 {
 }
 
+JNIEXPORT jlong JNICALL Java_jogamp_newt_driver_egl_gbm_DisplayDriver_CreatePointerIcon0
+  (JNIEnv *env, jclass clazz, jlong jgbmDevice, jobject jpixels, jint pixels_byte_offset, jboolean pixels_is_direct, 
+   jint width, jint height, jint hotX, jint hotY)
+{
+    const uint32_t *pixels = NULL;
+    struct gbm_device * gbmDevice = (struct gbm_device *) (intptr_t) jgbmDevice;
+    struct gbm_bo *bo = NULL;
+	uint32_t bo_handle;
+    uint32_t buf[64 * 64];
+    int i, j;
+
+    ERR_PRINT("cursor.cstr %dx%d %d/%d\n", width, height, hotX, hotY);
+
+    if ( NULL == jpixels ) {
+        ERR_PRINT("CreateCursor: null icon pixels\n");
+        return 0;
+    }
+    if( 0 >= width || width > 64 || 0 >= height || height > 64 ) {
+        ERR_PRINT("CreateCursor: icon must be of size [1..64] x [1..64]\n");
+        return 0;
+    }
+    {
+        const char * c1 = (const char *) ( JNI_TRUE == pixels_is_direct ? 
+                           (*env)->GetDirectBufferAddress(env, jpixels) : 
+                           (*env)->GetPrimitiveArrayCritical(env, jpixels, NULL) );
+        pixels = (uint32_t *) ( c1 + pixels_byte_offset );
+    }
+
+    bo = gbm_bo_create(gbmDevice, 64, 64, 
+                       GBM_FORMAT_ARGB8888,
+                       // GBM_FORMAT_BGRA8888,
+                       GBM_BO_USE_CURSOR_64X64 | GBM_BO_USE_WRITE);
+    if( NULL == bo ) {
+        ERR_PRINT("cursor.cstr gbm_bo_create failed\n");
+        return 0;
+    }
+
+    // align user data width x height -> 64 x 64
+    memset(buf, 0, sizeof(buf)); // cleanup
+    for(int i=0; i<height; i++) {
+        memcpy(buf + i * 64, pixels + i * width, width * 4);
+    }
+    if ( gbm_bo_write(bo, buf, sizeof(buf)) < 0 ) {
+        ERR_PRINT("cursor.cstr gbm_bo_write failed\n");
+        gbm_bo_destroy(bo);
+        return 0;
+    }
+    return (jlong) (intptr_t) bo;
+}
+
+JNIEXPORT void JNICALL Java_jogamp_newt_driver_egl_gbm_DisplayDriver_DestroyPointerIcon0
+  (JNIEnv *env, jclass clazz, jlong jcursor)
+{
+    struct gbm_bo *bo = (struct gbm_bo *) (intptr_t) jcursor;
+
+    if ( NULL == bo ) {
+        ERR_PRINT("DestroyCursor: null cursor\n");
+        return;
+    }
+    gbm_bo_destroy(bo);
+}
+
+JNIEXPORT jboolean JNICALL Java_jogamp_newt_driver_egl_gbm_DisplayDriver_SetPointerIcon0
+  (JNIEnv *env, jobject obj, jint drmFd, jint jcrtc_id, jlong jcursor, jboolean enable, jint x, jint y)
+{
+    uint32_t crtc_id = (uint32_t)jcrtc_id;
+    struct gbm_bo *bo = (struct gbm_bo *) (intptr_t) jcursor;
+    uint32_t bo_handle = gbm_bo_get_handle(bo).u32;
+    int ret;
+
+    // int drmModeSetCursor(int fd, uint32_t crtcId, uint32_t bo_handle, uint32_t width, uint32_t height);
+    // int drmModeSetCursor2(int fd, uint32_t crtcId, uint32_t bo_handle, uint32_t width, uint32_t height, int32_t hot_x, int32_t hot_y);
+    if( enable ) {
+        ret = drmModeSetCursor(drmFd, crtc_id, bo_handle, 64, 64);
+        if( ret ) {
+            ERR_PRINT("SetCursor enable failed: %d %s\n", ret, strerror(errno));
+        } else {
+            ret = drmModeMoveCursor(drmFd, crtc_id, x, y);
+            if( ret ) {
+                ERR_PRINT("SetCursor move failed: %d %s\n", ret, strerror(errno));
+            }
+        }
+    } else {
+        ret = drmModeSetCursor(drmFd, crtc_id, 0, 0, 0);
+        if( ret ) {
+            ERR_PRINT("SetCursor disable failed: %d %s\n", ret, strerror(errno));
+        }
+    }
+    return ret ? JNI_FALSE : JNI_TRUE;
+}
+
+JNIEXPORT jboolean JNICALL Java_jogamp_newt_driver_egl_gbm_DisplayDriver_MovePointerIcon0
+  (JNIEnv *env, jobject obj, jint drmFd, jint jcrtc_id, jint x, jint y)
+{
+    uint32_t crtc_id = (uint32_t)jcrtc_id;
+	int ret;
+
+    ret = drmModeMoveCursor(drmFd, crtc_id, x, y);
+    if( ret ) {
+        ERR_PRINT("cursor drmModeMoveCursor failed: %d %s\n", ret, strerror(errno));
+        return JNI_FALSE;
+    }
+    return JNI_TRUE;
+}
+
 /**
  * Screen
  */
-- 
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