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# skia_glfw_module
# This file created by 2023 Hin-Tak Leung; but Copyright skia-python project:
# Adapted from https://kyamagu.github.io/skia-python/tutorial/canvas.html#opengl-window
# Typical usage:
#
# from skia_glfw_module import glfw_window, skia_surface
# ....
# with glfw_window(WIDTH, HEIGHT) as window:
# ...
# with skia_surface(window) as surface:
# with surface as canvas:
# canvas.drawStuff()
#
# surface.flushAndSubmit()
# glfw.swap_buffers(window)
#
import contextlib, glfw
import skia
from OpenGL import GL
@contextlib.contextmanager
def glfw_window(WIDTH, HEIGHT):
if not glfw.init():
raise RuntimeError('glfw.init() failed')
glfw.window_hint(glfw.STENCIL_BITS, 8)
window = glfw.create_window(WIDTH, HEIGHT, '', None, None)
glfw.make_context_current(window)
yield window
glfw.terminate()
@contextlib.contextmanager
def skia_surface(window):
context = skia.GrDirectContext.MakeGL()
(fb_width, fb_height) = glfw.get_framebuffer_size(window)
backend_render_target = skia.GrBackendRenderTarget(
fb_width,
fb_height,
0, # sampleCnt
0, # stencilBits
skia.GrGLFramebufferInfo(0, GL.GL_RGBA8))
surface = skia.Surface.MakeFromBackendRenderTarget(
context, backend_render_target, skia.kBottomLeft_GrSurfaceOrigin,
skia.kRGBA_8888_ColorType, skia.ColorSpace.MakeSRGB())
assert surface is not None
yield surface
context.abandonContext()
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