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add nbpresent slide data
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‎pycon2017_cffi.ipynb‎

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@@ -41,7 +41,7 @@
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}
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"source": [
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"### Why did you bother to show up? There is a lecture about Grumpy and PyPy next door\n",
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"### Thanks for coming, I too would rather be in the lecture about Grumpy and PyPy next door\n",
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"\n",
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"Here is what we will do\n",
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"\n",
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"Our mission: to create a fractal image. Hmm, what is an image? We decide to define a simple structure to hold the image: width, height, data-as-pointer"
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"Now we design an API where we loop over the image, doing a calculation at each pixel location.\n",
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"For reasons known to only a select few, we normalize the horizontal values to be from -2 to 1 and the vertical values to -1 to 1, and then call a function with these normalized values. Also, our system architect is adamant that every function return a status, so our calculation function must accept a pointer to the value to be returned. This makes more sense in C, but can be done in python as well, although awkwardly.\n",
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"fig, ax = subplots(1)\n",
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"img = Image.open('python_numpy.png')\n",
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"ax.imshow(img); ax.set_title('pure python, {:.2f} millisecs'.format(pure_python*1000))"
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"ax.imshow(img); ax.set_title('pure python, {:.2f} millisecs'.format(pure_python*1000));"
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"#include <complex.h>\n",
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"\n",
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"int mandel(float x, float y, int max_iters, unsigned char * val)\n",
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"{\n",
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" int i = 0;\n",
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" _Complex float c = CMPLX(x, y);\n",
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" _Complex float z = CMPLX(0, 0);\n",
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" {\n",
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" z = z * z + c;\n",
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" if ((crealf(z) * crealf(z) + cimagf(z) * cimagf(z)) >= 4)\n",
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" {\n",
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" *val = i;\n",
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" *val = max_iters;\n",
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" return 1;\n",
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"%%bash\n",
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"### %%bash\n",
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"# EVERYONE KNOWS PYTHON IS TOO SLOW! So we outsource the whole thing to a contractor, keeping the format of\n",
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"# two functions and their signatures. The contractor rewrites it in C, now the ``*val`` make sense\n",
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"cat mandel.c"
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"#cffi\n",
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