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# CEF off-screen rendering using the Panda3D game engine:
# http://www.panda3d.org/
# You need panda3D SDK that is compatible with python 2.7,
# version 1.8.0 comes by default with python 2.7.
# To use custom python (not the one provided with the SDK)
# create a "panda.pth" file inside your copy of python, in
# this file put paths to panda & bin directory on separate
# lines, for example:
#
# c:\Panda3D-1.8.0
# c:\Panda3D-1.8.0\bin
#
# This will enable your copy of python to find the panda libraries.
# TODO: fix the blurriness of the browser when window is resized.
TEST_TRANSPARENCY = False
import platform
if platform.architecture()[0] != "32bit":
raise Exception("Only 32bit architecture is supported")
import os, sys
libcef_dll = os.path.join(os.path.dirname(os.path.abspath(__file__)),
'libcef.dll')
if os.path.exists(libcef_dll):
# Import the local module.
if 0x02070000 <= sys.hexversion < 0x03000000:
import cefpython_py27 as cefpython
elif 0x03000000 <= sys.hexversion < 0x04000000:
import cefpython_py32 as cefpython
else:
raise Exception("Unsupported python version: %s" % sys.version)
else:
# Import the package.
from cefpython1 import cefpython
from pandac.PandaModules import loadPrcFileData
loadPrcFileData("", "Panda3D example")
loadPrcFileData("", "fullscreen 0")
loadPrcFileData("", "win-size 1024 768")
from pandac.PandaModules import TransparencyAttrib
import direct.directbase.DirectStart
from panda3d.core import *
from direct.showbase.DirectObject import DirectObject
from direct.task import Task
from math import pi, sin, cos, floor, ceil
import platform
import ctypes
def GetApplicationPath(file=None):
import re, os
# If file is None return current directory without trailing slash.
if file is None:
file = ""
# Only when relative path.
if not file.startswith("/") and not file.startswith("\\") and (
not re.search(r"^[\w-]+:", file)):
if hasattr(sys, "frozen"):
path = os.path.dirname(sys.executable)
elif "__file__" in globals():
path = os.path.dirname(os.path.realpath(__file__))
else:
path = os.getcwd()
path = path + os.sep + file
path = re.sub(r"[/\\]+", re.escape(os.sep), path)
path = re.sub(r"[/\\]+$", "", path)
return path
return str(file)
def ExceptHook(excType, excValue, traceObject):
import traceback, os, time, codecs
# This hook does the following: in case of exception write it to
# the "error.log" file, display it to the console, shutdown CEF
# and exit application immediately by ignoring "finally" (_exit()).
errorMsg = "\n".join(traceback.format_exception(excType, excValue,
traceObject))
errorFile = GetApplicationPath("error.log")
try:
appEncoding = cefpython.g_applicationSettings["string_encoding"]
except:
appEncoding = "utf-8"
if type(errorMsg) == bytes:
errorMsg = errorMsg.decode(encoding=appEncoding, errors="replace")
try:
with codecs.open(errorFile, mode="a", encoding=appEncoding) as fp:
fp.write("\n[%s] %s\n" % (
time.strftime("%Y-%m-%d %H:%M:%S"), errorMsg))
except:
print("cefpython: WARNING: failed writing to error file: %s" % (
errorFile))
# Convert error message to ascii before printing, otherwise
# you may get error like this:
# | UnicodeEncodeError: 'charmap' codec can't encode characters
errorMsg = errorMsg.encode("ascii", errors="replace")
errorMsg = errorMsg.decode("ascii", errors="replace")
print("\n"+errorMsg+"\n")
cefpython.QuitMessageLoop()
cefpython.Shutdown()
os._exit(1)
class World(DirectObject):
browser = None
texture = None
nodePath = None
lastMouseMove = (-1, -1)
translateKeys = None
keyModifiers = 0
modifierKeys = None
def __init__(self):
environ = loader.loadModel("models/environment")
environ.reparentTo(render)
environ.setScale(0.25,0.25,0.25)
environ.setPos(-8,42,0)
taskMgr.add(self.spinCameraTask, "SpinCameraTask")
self.texture = Texture()
self.texture.setCompression(Texture.CMOff)
self.texture.setComponentType(Texture.TUnsignedByte)
self.texture.setFormat(Texture.FRgba4)
cardMaker = CardMaker("browser2d")
cardMaker.setFrame(-0.75, 0.75, -0.75, 0.75)
node = cardMaker.generate()
self.nodePath = render2d.attachNewNode(node)
self.nodePath.setTexture(self.texture)
if TEST_TRANSPARENCY:
self.nodePath.setTransparency(TransparencyAttrib.MAlpha)
self.nodePath.setHpr(0, 0, 5)
windowHandle = base.win.getWindowHandle().getIntHandle()
windowInfo = cefpython.WindowInfo()
windowInfo.SetAsOffscreen(windowHandle)
if TEST_TRANSPARENCY:
windowInfo.SetTransparentPainting(True)
# By default window rendering is 30 fps, let's change
# it to 60 for better user experience when scrolling.
browserSettings = {"animation_frame_rate": 60}
self.browser = cefpython.CreateBrowserSync(
windowInfo, browserSettings,
navigateUrl=GetApplicationPath("cefsimple.html"))
self.browser.SetClientHandler(
ClientHandler(self.browser, self.texture))
# SetFocus needs to be called after browser creation.
if platform.system() == "Windows":
ctypes.windll.user32.SetFocus(windowHandle)
self.browser.SendFocusEvent(True)
self.setBrowserSize()
self.accept("window-event", self.setBrowserSize)
self.initMouseHandlers()
self.initKeyboardHandlers()
taskMgr.add(self.messageLoop, "CefMessageLoop")
def setBrowserSize(self, window=None):
width = int(round(base.win.getXSize() * 0.75))
height = int(round(base.win.getYSize() * 0.75))
self.texture.setXSize(width)
self.texture.setYSize(height)
self.browser.SetSize(cefpython.PET_VIEW, width, height)
def initMouseHandlers(self):
# Browser methods for sending mouse/keyboard/focus events:
# SendKeyEvent(), SendMouseClickEvent(), SendMouseMoveEvent(),
# SendMouseWheelEvent(), SendFocusEvent(), SendCaptureLostEvent().
taskMgr.add(self.onMouseMove, "onMouseMove")
self.accept("mouse1", self.onMouseDown)
self.accept("mouse1-up", self.onMouseUp)
self.accept("wheel_up", self.onMouseWheelUp)
self.accept("wheel_down", self.onMouseWheelDown)
def initKeyboardHandlers(self):
self.translateKeys = {
"f1": cefpython.VK_F1, "f2": cefpython.VK_F2,
"f3": cefpython.VK_F3, "f4": cefpython.VK_F4,
"f5": cefpython.VK_F5, "f6": cefpython.VK_F6,
"f7": cefpython.VK_F7, "f8": cefpython.VK_F8,
"f9": cefpython.VK_F9, "f10": cefpython.VK_F10,
"f11": cefpython.VK_F11, "f12": cefpython.VK_F12,
"arrow_left": cefpython.VK_LEFT,
"arrow_up": cefpython.VK_UP,
"arrow_down": cefpython.VK_DOWN,
"arrow_right": cefpython.VK_RIGHT,
"enter": cefpython.VK_RETURN,
"tab": cefpython.VK_TAB,
"space": cefpython.VK_SPACE,
"escape": cefpython.VK_ESCAPE,
"backspace": cefpython.VK_BACK,
"insert": cefpython.VK_INSERT,
"delete": cefpython.VK_DELETE,
"home": cefpython.VK_HOME,
"end": cefpython.VK_END,
"page_up": cefpython.VK_PAGEUP,
"page_down": cefpython.VK_PAGEDOWN,
"num_lock": cefpython.VK_NUMLOCK,
"caps_lock": cefpython.VK_CAPITAL,
"scroll_lock": cefpython.VK_SCROLL,
"lshift": cefpython.VK_LSHIFT,
"rshift": cefpython.VK_RSHIFT,
"lcontrol": cefpython.VK_LCONTROL,
"rcontrol": cefpython.VK_RCONTROL,
"lalt": cefpython.VK_LMENU,
"ralt": cefpython.VK_RMENU,
}
base.buttonThrowers[0].node().setKeystrokeEvent('keystroke')
base.buttonThrowers[0].node().setButtonDownEvent('button-down')
base.buttonThrowers[0].node().setButtonUpEvent('button-up')
base.buttonThrowers[0].node().setButtonRepeatEvent('button-repeat')
self.accept("keystroke", self.onKeystroke)
self.accept("button-down", self.onButtonDown)
self.accept("button-up", self.onButtonUp)
self.accept("button-repeat", self.onButtonDown)
self.keyModifiers = 0
self.modifierKeys = {
"shift": cefpython.KEY_SHIFT,
"ctrl": cefpython.KEY_CTRL,
"alt": cefpython.KEY_ALT
}
def keyInfo(self, key):
if platform.system() == "Windows":
return (key, 0, 0)
elif platform.system() == "Darwin":
return (key, 0, 0)
elif platform.system() == "Linux":
return (key,)
def onKeystroke(self, key):
self.browser.SendKeyEvent(cefpython.KEYTYPE_CHAR,
self.keyInfo(ord(key)), 0)
def onButtonDownOrUp(self, keyType, key):
if key in self.modifierKeys:
self.keyModifiers |= self.modifierKeys[key]
else:
if key in self.translateKeys:
self.browser.SendKeyEvent(keyType,
self.keyInfo(self.translateKeys[key]),
self.keyModifiers)
def onButtonDown(self, key):
self.onButtonDownOrUp(cefpython.KEYTYPE_KEYDOWN, key)
def onButtonUp(self, key):
self.onButtonDownOrUp(cefpython.KEYTYPE_KEYUP, key)
def isMouseInsideBrowser(self, mouse):
if mouse.getX() >= -0.75 and mouse.getX() <= 0.75 and (
mouse.getY() >= -0.75 and mouse.getY() <= 0.75):
return True
else:
return False
def getMousePixelCoordinates(self, mouse):
# This calculation works only for the browser area.
relX = mouse.getX()
relY = mouse.getY()
relX += 0.75 # 0 .. 1.5
relY += 0.75 # 0 .. 1.5
width = self.texture.getXSize()
height = self.texture.getYSize()
width /= 1.5
height /= 1.5
pixelX = relX * width
pixelY = relY * height
pixelY = abs(pixelY - self.texture.getYSize())
pixelX = int(round(pixelX))
pixelY = int(round(pixelY))
return (pixelX, pixelY)
def onMouseMove(self, task):
if base.mouseWatcherNode.hasMouse():
mouse = base.mouseWatcherNode.getMouse()
(lastX, lastY) = self.lastMouseMove
if lastX == mouse.getX() and lastY == mouse.getY():
return Task.cont
else:
self.lastMouseMove = (mouse.getX(), mouse.getY())
if self.isMouseInsideBrowser(mouse):
self.nodePath.setHpr(0, 0, 0)
(x,y) = self.getMousePixelCoordinates(mouse)
self.browser.SendMouseMoveEvent(x, y, mouseLeave=False)
else:
self.browser.SendMouseMoveEvent(-1, -1, mouseLeave=True)
self.nodePath.setHpr(0, 0, 5)
else:
self.nodePath.setHpr(0, 0, 5)
return Task.cont
def onMouseDown(self):
mouse = base.mouseWatcherNode.getMouse()
(x,y) = self.getMousePixelCoordinates(mouse)
self.browser.SendMouseClickEvent(x, y, cefpython.MOUSEBUTTON_LEFT,
mouseUp=False, clickCount=1)
def onMouseUp(self):
mouse = base.mouseWatcherNode.getMouse()
(x,y) = self.getMousePixelCoordinates(mouse)
self.browser.SendMouseClickEvent(x, y, cefpython.MOUSEBUTTON_LEFT,
mouseUp=True, clickCount=1)
def onMouseWheelUp(self):
if base.mouseWatcherNode.hasMouse():
mouse = base.mouseWatcherNode.getMouse()
if self.isMouseInsideBrowser(mouse):
(x,y) = self.getMousePixelCoordinates(mouse)
self.browser.SendMouseWheelEvent(x, y, deltaX=0, deltaY=120)
def onMouseWheelDown(self):
if base.mouseWatcherNode.hasMouse():
mouse = base.mouseWatcherNode.getMouse()
if self.isMouseInsideBrowser(mouse):
(x,y) = self.getMousePixelCoordinates(mouse)
self.browser.SendMouseWheelEvent(x, y, deltaX=0, deltaY=-120)
def messageLoop(self, task):
cefpython.MessageLoopWork()
return Task.cont
def spinCameraTask(self, task):
angleDegrees = task.time * 6.0
angleRadians = angleDegrees * (pi / 180.0)
camera.setPos(20 * sin(angleRadians), -20.0 * cos(angleRadians), 3)
camera.setHpr(angleDegrees, 0, 0)
return Task.cont
class ClientHandler:
browser = None
texture = None
def __init__(self, browser, texture):
self.browser = browser
self.texture = texture
def OnPaint(self, browser, paintElementType, dirtyRects, buffer):
(width, height) = self.browser.GetSize(paintElementType)
img = self.texture.modifyRamImage()
if paintElementType == cefpython.PET_POPUP:
print("width=%s, height=%s" % (width, height))
elif paintElementType == cefpython.PET_VIEW:
img.setData(buffer.GetString(mode="bgra", origin="bottom-left"))
else:
raise Exception("Unknown paintElementType: %s" % paintElementType)
def GetViewRect(self, browser, rect):
return False
print("GetViewRect()")
width = self.texture.getXSize()
height = self.texture.getYSize()
rect.append(0)
rect.append(0)
rect.append(width)
rect.append(height)
return True
def GetScreenRect(self, browser, rect):
return False
print("GetScreenRect()")
return self.GetViewRect(browser, rect)
def GetScreenPoint(self, browser, viewX, viewY, screenCoordinates):
return False
print("GetScreenPoint()")
return False
def OnLoadEnd(self, browser, frame, httpStatusCode):
return
self._saveImage()
def _saveImage(self):
try:
from PIL import Image
except:
print("PIL library not available, can't save image")
return
(width, height) = self.browser.GetSize(cefpython.PET_VIEW)
buffer = self.browser.GetImage(cefpython.PET_VIEW, width, height)
image = Image.fromstring(
"RGBA", (width,height),
buffer.GetString(mode="rgba", origin="top-left"),
"raw", "RGBA", 0, 1)
image.save("panda3d_image.png", "PNG")
if __name__ == "__main__":
sys.excepthook = ExceptHook
settings = {
"log_severity": cefpython.LOGSEVERITY_INFO,
"log_file": GetApplicationPath("debug.log"),
"release_dcheck_enabled": True # Enable only when debugging.
}
cefpython.Initialize(settings)
print("Panda3D version: %s" % PandaSystem.getVersionString())
w = World()
run()
del w
cefpython.Shutdown()
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