private void FindProperValues(float threshold, ref SerializedProperty top, ref SerializedProperty bottom, ref SerializedProperty left, ref SerializedProperty right)
{
int width = InputSequence.width;
int height = InputSequence.height;
int minX = width;
int maxX = 0;
int minY = height;
int maxY = 0;
Color[] colors;
RenderTexture tempRT = RenderTexture.GetTemporary(width, height, 0, RenderTextureFormat.ARGBHalf, RenderTextureReadWrite.Linear);
for (int i = 0; i < InputSequence.frames.Count; i++)
{
ProcessingFrame f = InputSequence.frames[i];
VFXToolboxGUIUtility.DisplayProgressBar("Crop processor", "Evaluating closest bound (Frame #" + i + " on " + InputSequence.frames.Count + "...)", (float)i / InputSequence.frames.Count);
if (InputSequence.processor != null)
{
f.Process();
colors = VFXToolboxUtility.ReadBack(f.texture as RenderTexture);
}
else
{
Graphics.Blit(f.texture, tempRT);
colors = VFXToolboxUtility.ReadBack(tempRT);
}
// Check frame
for (int j = 0; j < colors.Length; j++)
{
int x = j % width;
int y = j / width;
if (colors[j].a >= threshold)
{
minX = Mathf.Min(minX, x);
maxX = Mathf.Max(maxX, x);
minY = Mathf.Min(minY, y);
maxY = Mathf.Max(maxY, y);
}
}
}
VFXToolboxGUIUtility.ClearProgressBar();
bottom.intValue = minY;
top.intValue = height - maxY - 1;
left.intValue = minX;
right.intValue = width - maxX - 1;
RenderTexture.ReleaseTemporary(tempRT);
}