vl/compositor: implement error handling

pipe_buffer_map and pipe_buffer_create may return NULL

Signed-off-by: Nayan Deshmukh <nayan26deshmukh@gmail.com>
Reviewed-by: Christian König <christian.koenig@amd.com>

src/gallium/auxiliary/vl/vl_compositor.c

@@ -919,7 +919,7 @@ vl_compositor_cleanup(struct vl_compositor *c)
    cleanup_pipe_state(c);
 }
 
-void
+bool
 vl_compositor_set_csc_matrix(struct vl_compositor_state *s,
                              vl_csc_matrix const *matrix,
                              float luma_min, float luma_max)
@@ -932,6 +932,9 @@ vl_compositor_set_csc_matrix(struct vl_compositor_state *s,
                                PIPE_TRANSFER_WRITE | PIPE_TRANSFER_DISCARD_RANGE,
                                &buf_transfer);
 
+   if (!ptr)
+      return false;
+
    memcpy(ptr, matrix, sizeof(vl_csc_matrix));
 
    ptr += sizeof(vl_csc_matrix)/sizeof(float);
@@ -939,6 +942,8 @@ vl_compositor_set_csc_matrix(struct vl_compositor_state *s,
    ptr[1] = luma_max;
 
    pipe_buffer_unmap(s->pipe, buf_transfer);
+
+   return true;
 }
 
 void
@@ -1246,10 +1251,14 @@ vl_compositor_init_state(struct vl_compositor_state *s, struct pipe_context *pip
       sizeof(csc_matrix) + 2*sizeof(float)
    );
 
+   if (!s->csc_matrix)
+      return false;
+
    vl_compositor_clear_layers(s);
 
    vl_csc_get_matrix(VL_CSC_COLOR_STANDARD_IDENTITY, NULL, true, &csc_matrix);
-   vl_compositor_set_csc_matrix(s, (const vl_csc_matrix *)&csc_matrix, 1.0f, 0.0f);
+   if (!vl_compositor_set_csc_matrix(s, (const vl_csc_matrix *)&csc_matrix, 1.0f, 0.0f))
+      return false;
 
    return true;
 }

src/gallium/auxiliary/vl/vl_compositor.h

@@ -142,7 +142,7 @@ vl_compositor_init_state(struct vl_compositor_state *state, struct pipe_context
 /**
  * set yuv -> rgba conversion matrix
  */
-void
+bool
 vl_compositor_set_csc_matrix(struct vl_compositor_state *settings,
                              const vl_csc_matrix *matrix,
                              float luma_min, float luma_max);