我放弃了在没有ctypes
我们需要的情况下创建它ctypes.byref
,我现在正在导入sdl2
而不是sdl2.ext
更pythonic,但也限制了这里需要的一些功能。
现在回答这个问题,我在这里遵循了本指南(如果您不构建浏览器,它可能对您来说有点偏离主题)
所以我还从上面的指南中实现了一个足够通用的版本,你可以绘制到Window.skia_surface
然后调用Window.update
将skia表面复制到窗口屏幕:
import skia
import sdl2 as sdl
from ctypes import byref
def sdl_event_loop():
event = sdl.SDL_Event()
running = True
while running:
pending_events = sdl.SDL_PollEvent(byref(event))
while pending_events != 0:
# QUIT HANDLER
if event.type == sdl.SDL_QUIT:
running = False
sdl.SDL_Quit()
break
# UPDATE PENDING EVENTS
pending_events = sdl.SDL_PollEvent(byref(event))
class Window:
DEFAULT_FLAGS = sdl.SDL_WINDOW_SHOWN
BYTE_ORDER = {
# ---------- -> RED GREEN BLUE ALPHA
"BIG_ENDIAN": (0xff000000, 0x00ff0000, 0x0000ff00, 0x000000ff),
"LIL_ENDIAN": (0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000)
}
PIXEL_DEPTH = 32 # BITS PER PIXEL
PIXEL_PITCH_FACTOR = 4 # Multiplied by Width to get BYTES PER ROW
def __init__(self, title, width, height, x=None, y=None, flags=None):
self.title = bytes(title, "utf8")
self.width = width
self.height = height
# Center Window By default
self.x, self.y = x, y
if x is None:
self.x = sdl.SDL_WINDOWPOS_CENTERED
if y is None:
self.y = sdl.SDL_WINDOWPOS_CENTERED
# Override flags
self.flags = flags
if flags is None:
self.flags = self.DEFAULT_FLAGS
# SET RGBA MASKS BASED ON BYTE_ORDER
is_big_endian = sdl.SDL_BYTEORDER == sdl.SDL_BIG_ENDIAN
if is_big_endian:
self.RGBA_MASKS = self.BYTE_ORDER["BIG_ENDIAN"]
else:
self.RGBA_MASKS = self.BYTE_ORDER["LIL_ENDIAN"]
# CALCULATE PIXEL PITCH
self.PIXEL_PITCH = self.PIXEL_PITCH_FACTOR * self.width
# SKIA INIT
self.skia_surface = self.__create_skia_surface()
# SDL INIT
sdl.SDL_Init(sdl.SDL_INIT_EVENTS) # INITIALIZE SDL EVENTS
self.sdl_window = self.__create_SDL_Window()
sdl_event_loop()
def __create_SDL_Window(self):
window = sdl.SDL_CreateWindow(
self.title,
self.x, self.y,
self.width, self.height,
self.flags
)
return window
def __create_skia_surface(self):
surface_blueprint = skia.ImageInfo.Make(
self.width, self.height,
ct=skia.kRGBA_8888_ColorType,
at=skia.kUnpremul_AlphaType
)
surface = skia.Surface.MakeRaster(surface_blueprint)
return surface
def __pixels_from_skia_surface(self):
image = self.skia_surface.makeImageSnapshot()
pixels = image.tobytes()
return pixels
def __transform_skia_surface_to_SDL_surface(self):
pixels = self.__pixels_from_skia_surface()
sdl_surface = sdl.SDL_CreateRGBSurfaceFrom(
pixels,
self.width, self.height,
self.PIXEL_DEPTH, self.PIXEL_PITCH,
*self.RGBA_MASKS
)
return sdl_surface
def update(self):
rect = sdl.SDL_Rect(0, 0, self.width, self.height)
window_surface = sdl.SDL_GetWindowSurface(self.sdl_window) # the SDL surface associated with the window
transformed_skia_surface = self.__transform_skia_surface_to_SDL_surface()
# Transfer skia surface to SDL window's surface
sdl.SDL_BlitSurface(
transformed_skia_surface, rect,
window_surface, rect
)
# Update window with new copied data
sdl.SDL_UpdateWindowSurface(self.sdl_window)
if __name__ == "__main__":
window = Window("Browser Test", 500, 500, flags=sdl.SDL_WINDOW_SHOWN | sdl.SDL_WINDOW_RESIZABLE)
说明: 上面的代码主要做了四件事,创建一个您将在其上绘制的滑雪表面,创建一个 SDL 窗口,将滑雪表面转换为 SDL 表面,最后将新创建的表面中的数据复制到与窗口并更新它。如需更多解释,我建议您查看上述指南并查看skia-python 文档和SDL2 的 API 参考。