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import sys
import wx
# use the numpy code instead of the raw access code for comparison
USE_NUMPY = False
# time the execution of making a bitmap?
TIMEIT = False
PASSES = 100
# how big to make the bitmaps
DIM = 100
# should we use a wx.GraphicsContext for painting?
TEST_GC = False
#----------------------------------------------------------------------
# attempt to import a numeric module if requested to
if USE_NUMPY:
try:
import numpy as np
def makeByteArray(shape):
return np.empty(shape, np.uint8)
numtype = 'numpy'
except ImportError:
USE_NUMPY = False
#----------------------------------------------------------------------
class TestPanel(wx.Panel):
def __init__(self, parent, log):
self.log = log
wx.Panel.__init__(self, parent, -1)
self.Bind(wx.EVT_PAINT, self.OnPaint)
if TIMEIT:
import timeit
timeit.s = self # Put self in timeit's global namespace as
# 's' so it can be found in the code
# snippets being tested.
if not USE_NUMPY:
t = timeit.Timer("bmp = s.MakeBitmap(10, 20, 30)")
else:
t = timeit.Timer("bmp = s.MakeBitmap2(10, 20, 30)")
log.write("Timing...\n")
num = PASSES
tm = t.timeit(num)
log.write("%d passes creating %dx%d images in %f seconds\n"
"\t%f seconds per pass " % (num, DIM,DIM, tm, tm/num))
if not USE_NUMPY:
log.write("using raw access\n")
self.redBmp = self.MakeBitmap(178, 34, 34)
self.greenBmp = self.MakeBitmap( 35, 142, 35)
self.blueBmp = self.MakeBitmap( 0, 0, 139)
else:
log.write("using %s\n" % numtype)
self.redBmp = self.MakeBitmap2(178, 34, 34)
self.greenBmp = self.MakeBitmap2( 35, 142, 35)
self.blueBmp = self.MakeBitmap2( 0, 0, 139)
def OnPaint(self, evt):
dc = wx.PaintDC(self)
if not TEST_GC:
dc.DrawBitmap(self.redBmp, 50, 50, True)
dc.DrawBitmap(self.greenBmp, 110, 110, True)
dc.DrawBitmap(self.blueBmp, 170, 50, True)
self.log.write("using wx.DC\n")
else:
gc = wx.GraphicsContext.Create(dc)
gc.DrawBitmap(self.redBmp, 50, 50, DIM,DIM)
gc.DrawBitmap(self.greenBmp, 110, 110, DIM,DIM)
gc.DrawBitmap(self.blueBmp, 170, 50, DIM,DIM)
self.log.write("using wx.GraphicsContext\n")
def MakeBitmap(self, red, green, blue, alpha=128):
# Create the bitmap that we will stuff pixel values into using
# the raw bitmap access classes.
bmp = wx.Bitmap(DIM, DIM, 32)
# Create an object that facilitates access to the bitmap's
# pixel buffer
pixelData = wx.AlphaPixelData(bmp)
if not pixelData:
raise RuntimeError("Failed to gain raw access to bitmap data.")
# We have two ways to access each pixel, first we'll use an
# iterator to set every pixel to the colour and alpha values
# passed in.
for pixel in pixelData:
pixel.Set(red, green, blue, alpha)
# This block of code is another way to do the same as above,
# but with the accessor interface instead of the Python
# iterator. It is a bit faster than the above because it
# avoids the iterator/generator magic, but it is not nearly as
# 'clean' looking ;-)
#pixels = pixelData.GetPixels()
#for y in range(DIM):
# pixels.MoveTo(pixelData, 0, y)
# for x in range(DIM):
# pixels.Set(red, green, blue, alpha)
# pixels.nextPixel()
# Next we'll use the pixel accessor to set the border pixels
# to be fully opaque
pixels = pixelData.GetPixels()
for x in range(DIM):
pixels.MoveTo(pixelData, x, 0)
pixels.Set(red, green, blue, wx.ALPHA_OPAQUE)
pixels.MoveTo(pixelData, x, DIM-1)
pixels.Set(red, green, blue, wx.ALPHA_OPAQUE)
for y in range(DIM):
pixels.MoveTo(pixelData, 0, y)
pixels.Set(red, green, blue, wx.ALPHA_OPAQUE)
pixels.MoveTo(pixelData, DIM-1, y)
pixels.Set(red, green, blue, wx.ALPHA_OPAQUE)
return bmp
def MakeBitmap2(self, red, green, blue, alpha=128):
# Make an array of bytes that is DIM*DIM in size, with enough
# slots for each pixel to have a RGB and A value
arr = makeByteArray( (DIM,DIM, 4) )
# just some indexes to keep track of which byte is which
R, G, B, A = range(4)
# initialize all pixel values to the values passed in
arr[:,:,R] = red
arr[:,:,G] = green
arr[:,:,B] = blue
arr[:,:,A] = alpha
# Set the alpha for the border pixels to be fully opaque
arr[0, 0:DIM, A] = wx.ALPHA_OPAQUE # first row
arr[DIM-1, 0:DIM, A] = wx.ALPHA_OPAQUE # last row
arr[0:DIM, 0, A] = wx.ALPHA_OPAQUE # first col
arr[0:DIM, DIM-1, A] = wx.ALPHA_OPAQUE # last col
# finally, use the array to create a bitmap
bmp = wx.Bitmap.FromBufferRGBA(DIM, DIM, arr)
return bmp
#----------------------------------------------------------------------
if __name__ == '__main__':
app = wx.App()
frm = wx.Frame(None, title="RawBitmap Test", size=(500,350))
pnl = TestPanel(frm, sys.stdout)
frm.Show()
app.MainLoop()
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