Added a PIL alpha_over extension in C, and code to setup.py to build it
I needed a way to let py2exe options be provided only when py2exe is available. My solution (maybe not the best) was to put all the arguments for the final setup() call into a dictionary, that is filled in conditionally during the script's execution. This is why the file is completely changed; however, it still does what it used to do (when py2exe is available).
This commit is contained in:
Aaron Griffith
7
.gitignore
vendored
7
.gitignore
vendored
@@ -1 +1,8 @@
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*.pyc
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build
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# various forms of compiled _composite extensions
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_composite.so
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_composite.pyd
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_composite_d.pyd
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_composite.dylib
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217
_composite.c
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217
_composite.c
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@@ -0,0 +1,217 @@
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/*
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* This file is part of the Minecraft Overviewer.
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*
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* Minecraft Overviewer is free software: you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as published
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* by the Free Software Foundation, either version 3 of the License, or (at
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* your option) any later version.
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*
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* Minecraft Overviewer is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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* Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with the Overviewer. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* This file implements a custom alpha_over function for (some) PIL
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* images. It's designed to be used through composite.py, which
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* includes a proxy alpha_over function that falls back to the default
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* PIL paste if this extension is not found.
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*/
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#include <Python.h>
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#include <Imaging.h>
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/* like (a * b + 127) / 255), but much faster on most platforms
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from PIL's _imaging.c */
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#define MULDIV255(a, b, tmp) \
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(tmp = (a) * (b) + 128, ((((tmp) >> 8) + (tmp)) >> 8))
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typedef struct
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{
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PyObject_HEAD
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Imaging image;
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} ImagingObject;
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static Imaging imaging_python_to_c(PyObject* obj)
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{
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/* first, get the 'im' attribute */
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PyObject* im = PyObject_GetAttrString(obj, "im");
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if (!im)
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return NULL;
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/* make sure 'im' is the right type */
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if (strcmp(im->ob_type->tp_name, "ImagingCore") != 0)
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{
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/* it's not -- raise an error and exit */
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PyErr_SetString(PyExc_TypeError, "image attribute 'im' is not a core Imaging type");
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return NULL;
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}
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Imaging image = ((ImagingObject*)im)->image;
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Py_DECREF(im);
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return image;
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}
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static PyObject* _composite_alpha_over(PyObject* self, PyObject* args)
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{
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PyObject* dest, * src, * pos, * mask;
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if (!PyArg_ParseTuple(args, "OOOO", &dest, &src, &pos, &mask))
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return NULL;
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Imaging imDest = imaging_python_to_c(dest);
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Imaging imSrc = imaging_python_to_c(src);
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Imaging imMask = imaging_python_to_c(mask);
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if (!imDest || !imSrc || !imMask)
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return NULL;
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/* check the various image modes, make sure they make sense */
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if (strcmp(imDest->mode, "RGBA") != 0)
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{
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PyErr_SetString(PyExc_ValueError, "given destination image does not have mode \"RGBA\"");
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return NULL;
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}
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if (strcmp(imSrc->mode, "RGBA") != 0 && strcmp(imSrc->mode, "RGB") != 0)
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{
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PyErr_SetString(PyExc_ValueError, "given source image does not have mode \"RGBA\" or \"RGB\"");
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return NULL;
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}
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if (strcmp(imMask->mode, "RGBA") != 0 && strcmp(imMask->mode, "L") != 0)
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{
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PyErr_SetString(PyExc_ValueError, "given mask image does not have mode \"RGBA\" or \"L\"");
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return NULL;
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}
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/* make sure mask size matches src size */
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if (imSrc->xsize != imMask->xsize || imSrc->ysize != imMask->ysize)
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{
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PyErr_SetString(PyExc_ValueError, "mask and source image sizes do not match");
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return NULL;
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}
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/* set up flags for the src/mask type */
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int src_has_alpha = (imSrc->pixelsize == 4 ? 1 : 0);
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/* how far into image the first alpha byte resides */
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int mask_offset = (imMask->pixelsize == 4 ? 3 : 0);
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/* how many bytes to skip to get to the next alpha byte */
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int mask_stride = imMask->pixelsize;
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/* destination position read */
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int dx, dy, xsize, ysize;
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if (!PyArg_ParseTuple(pos, "iiii", &dx, &dy, &xsize, &ysize))
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{
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PyErr_SetString(PyExc_TypeError, "given blend destination rect is not valid");
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return NULL;
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}
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/* set up the source position, size and destination position */
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int sx, sy;
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/* handle negative dest pos */
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if (dx < 0)
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{
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sx = -dx;
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dx = 0;
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} else {
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sx = 0;
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}
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if (dy < 0)
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{
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sy = -dy;
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dy = 0;
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} else {
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sy = 0;
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}
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/* set up source dimensions */
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xsize -= sx;
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ysize -= sy;
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/* clip dimensions, if needed */
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if (dx + xsize > imDest->xsize)
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xsize = imDest->xsize - dx;
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if (dy + ysize > imDest->ysize)
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ysize = imDest->ysize - dy;
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/* check that there remains any blending to be done */
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if (xsize <= 0 || ysize <= 0)
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{
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/* nothing to do, return */
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Py_INCREF(dest);
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return dest;
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}
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/* iteration variables */
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unsigned int x, y, i;
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/* temporary calculation variables */
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int tmp1, tmp2, tmp3;
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for (y = 0; y < ysize; y++)
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{
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UINT8* out = (UINT8*) imDest->image[dy + y] + dx*4;
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UINT8* outmask = (UINT8*) imDest->image[dy + y] + dx*4 + 3;
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UINT8* in = (UINT8*) imSrc->image[sy + y] + sx*(imSrc->pixelsize);
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UINT8* inmask = (UINT8*) imMask->image[sy + y] + sx*mask_stride + mask_offset;
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for (x = 0; x < xsize; x++)
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{
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/* special cases */
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if (*inmask == 255 || *outmask == 0)
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{
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*outmask = *inmask;
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*out = *in;
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out++, in++;
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*out = *in;
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out++, in++;
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*out = *in;
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out++, in++;
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} else if (*inmask == 0) {
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/* do nothing -- source is fully transparent */
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out += 3;
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in += 3;
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} else {
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/* general case */
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int alpha = *inmask + MULDIV255(*outmask, 255 - *inmask, tmp1);
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for (i = 0; i < 3; i++)
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{
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/* general case */
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*out = MULDIV255(*in, *inmask, tmp1) + MULDIV255(MULDIV255(*out, *outmask, tmp2), 255 - *inmask, tmp3);
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*out = (*out * 255) / alpha;
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out++, in++;
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}
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*outmask = alpha;
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}
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out++;
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if (src_has_alpha)
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in++;
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outmask += 4;
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inmask += mask_stride;
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}
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}
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Py_INCREF(dest);
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return dest;
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}
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static PyMethodDef _CompositeMethods[] =
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{
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{"alpha_over", _composite_alpha_over, METH_VARARGS, "alpha over composite function"},
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{NULL, NULL, 0, NULL}
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};
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PyMODINIT_FUNC init_composite(void)
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{
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(void) Py_InitModule("_composite", _CompositeMethods);
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}
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75
setup.py
75
setup.py
@@ -1,13 +1,68 @@
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from distutils.core import setup
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import py2exe
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from distutils.core import setup, Extension
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from distutils.command.build import build
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from distutils.command.clean import clean
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from distutils.dir_util import remove_tree
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from distutils import log
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import os, os.path
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setup(console=['gmap.py'],
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data_files=[('textures', ['textures/lava.png', 'textures/water.png']),
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('', ['template.html'])],
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zipfile = None,
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options = {'py2exe': {
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'bundle_files': 1,
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}},
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try:
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import py2exe
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except ImportError:
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py2exe = None
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# now, setup the keyword arguments for setup
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# (because we don't know until runtime if py2exe is available)
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setup_kwargs = {}
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setup_kwargs['options'] = {}
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setup_kwargs['ext_modules'] = []
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setup_kwargs['cmdclass'] = {}
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)
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#
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# py2exe options
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#
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if py2exe != None:
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setup_kwargs['console'] = ['gmap.py']
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setup_kwargs['data_files'] = [('textures', ['textures/lava.png', 'textures/water.png']),
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('', ['template.html'])]
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setup_kwargs['zipfile'] = None
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setup_kwargs['options']['py2exe'] = {'bundle_files' : 1}
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#
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# _composite.c extension
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#
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setup_kwargs['ext_modules'].append(Extension('_composite', ['_composite.c']))
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# tell build_ext to build the extension in-place
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# (NOT in build/)
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setup_kwargs['options']['build_ext'] = {'inplace' : 1}
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# tell the build command to only run build_ext
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build.sub_commands = [('build_ext', None)]
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# custom clean command to remove in-place extension
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class CustomClean(clean):
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def run(self):
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# do the normal cleanup
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clean.run(self)
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# try to remove '_composite.{so,pyd,...}' extension,
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# regardless of the current system's extension name convention
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build_ext = self.get_finalized_command('build_ext')
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fname = build_ext.get_ext_fullpath('_composite')
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pretty_fname = os.path.split(fname)[1]
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if os.path.exists(fname):
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try:
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if not self.dry_run:
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os.remove(fname)
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log.info("removing '%s'", pretty_fname)
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except OSError:
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log.warn("'%s' could not be cleaned -- permission denied",
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pretty_fname)
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else:
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log.debug("'%s' does not exist -- can't clean it",
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pretty_fname)
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setup_kwargs['cmdclass']['clean'] = CustomClean
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###
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setup(**setup_kwargs)
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Reference in New Issue
Block a user