add pillow package (#861)

docs/changelog.md

@@ -20,7 +20,7 @@
   [#846](https://github.com/iodide-project/pyodide/pull/846)
 - Updated to emscripten 1.38.34
   [#480](https://github.com/iodide-project/pyodide/pull/480)
-- New packages: freesasa, lxml, python-sat, traits, astropy
+- New packages: freesasa, lxml, python-sat, traits, astropy, pillow
 - Updated packages: numpy 1.15.4, pandas 1.0.5 among others.
 - Updated default `--ldflags` argument to `pyodide_build` scripts to equal what
   pyodide actually uses.

packages/pillow/meta.yaml

@@ -0,0 +1,19 @@
+package:
+  name: pillow
+  version: 8.0.1
+source:
+  sha256: 11c5c6e9b02c9dac08af04f093eb5a2f84857df70a7d4a6a6ad461aca803fb9e
+  url: https://files.pythonhosted.org/packages/2b/06/93bf1626ef36815010e971a5ce90f49919d84ab5d2fa310329f843a74bc1/Pillow-8.0.1.tar.gz
+
+  patches:
+   - patches/setitup.patch
+  extras:
+   -
+      - src/setup.cfg
+      - ./setup.cfg
+build:
+  cflags: -s USE_ZLIB=1 -s USE_LIBJPEG=1 -s USE_FREETYPE=1
+  ldflags: -L ../../../../emsdk/emsdk/.emscripten_cache/asmjs/ ../../../../emsdk/emsdk/.emscripten_cache/asmjs/libjpeg.bc
+test:
+  imports:
+  - PIL

packages/pillow/patches/setitup.patch

@@ -0,0 +1,45 @@
+--- a/setup.py	2020-10-22 16:27:16.000000000 +0200
++++ b/setup.py	2020-12-15 08:43:30.000000000 +0100
+@@ -557,7 +557,9 @@
+ 
+         if feature.want("zlib"):
+             _dbg("Looking for zlib")
+-            if _find_include_file(self, "zlib.h"):
++            if "PYODIDE_PACKAGE_ABI" in os.environ:
++                feature.zlib = "z"
++            elif _find_include_file(self, "zlib.h"):
+                 if _find_library_file(self, "z"):
+                     feature.zlib = "z"
+                 elif sys.platform == "win32" and _find_library_file(self, "zlib"):
+@@ -565,7 +567,9 @@
+ 
+         if feature.want("jpeg"):
+             _dbg("Looking for jpeg")
+-            if _find_include_file(self, "jpeglib.h"):
++            if "PYODIDE_PACKAGE_ABI" in os.environ:
++                feature.jpeg = "jpeg"
++            elif _find_include_file(self, "jpeglib.h"):
+                 if _find_library_file(self, "jpeg"):
+                     feature.jpeg = "jpeg"
+                 elif sys.platform == "win32" and _find_library_file(self, "libjpeg"):
+@@ -631,7 +635,9 @@
+ 
+         if feature.want("freetype"):
+             _dbg("Looking for freetype")
+-            if _find_library_file(self, "freetype"):
++            if "PYODIDE_PACKAGE_ABI" in os.environ:
++                feature.freetype = "freetype"
++            elif _find_library_file(self, "freetype"):
+                 # look for freetype2 include files
+                 freetype_version = 0
+                 for subdir in self.compiler.include_dirs:
+@@ -704,7 +710,8 @@
+         libs = self.add_imaging_libs.split()
+         defs = []
+         if feature.jpeg:
+-            libs.append(feature.jpeg)
++            if not "PYODIDE_PACKAGE_ABI" in os.environ:
++                libs.append(feature.jpeg)
+             defs.append(("HAVE_LIBJPEG", None))
+         if feature.jpeg2000:
+             libs.append(feature.jpeg2000)

packages/pillow/src/setup.cfg

@@ -0,0 +1,12 @@
+[build_ext]
+disable-platform-guessing=True
+enable-zlib=True
+enable-jpeg=True
+enable-freetype=True
+disable-lcms=True
+disable-tiff=True
+disable-xcb=True
+disable-webp=True
+disable-webpmux=True
+disable-jpeg2000=True
+disable-imagequant=True

packages/pillow/test_pillow.py

@@ -0,0 +1,24 @@
+def test_pillow(selenium):
+    selenium.load_package("pillow")
+    selenium.run(
+        r"""
+from PIL import Image, ImageDraw, ImageOps
+import io
+
+img=Image.new('RGB',(4,4),color=(0,0,0))
+ctx=ImageDraw.Draw(img)
+ctx.line([0,0,3,0,3,3,0,3,0,0],(255,0,0),1)
+img.putpixel((1,1),(0,255,0))
+img.putpixel((2,2),(0,0,255))
+img=ImageOps.flip(img)
+assert img.tobytes() == b'\xff\x00\x00\xff\x00\x00\xff\x00\x00\xff\x00\x00\xff\x00\x00\x00\x00\x00\x00\x00\xff\xff\x00\x00\xff\x00\x00\x00\xff\x00\x00\x00\x00\xff\x00\x00\xff\x00\x00\xff\x00\x00\xff\x00\x00\xff\x00\x00'
+byio=io.BytesIO()
+img.save(byio,format='PNG')
+assert byio.getvalue() == b'\x89PNG\r\n\x1a\n\x00\x00\x00\rIHDR\x00\x00\x00\x04\x00\x00\x00\x04\x08\x02\x00\x00\x00&\x93\t)\x00\x00\x00\x1cIDATx\x9cc\xfc\xcf\x80\x04`\x9c\xff\xff\x19\x18\x98`\x02\x8c\x0c\x0c\x0c\x8c\xc8\xca\x00\xb5\x05\x06\x00\xcbi8B\x00\x00\x00\x00IEND\xaeB`\x82'  
+img=Image.open(byio)
+assert img.tobytes() == b'\xff\x00\x00\xff\x00\x00\xff\x00\x00\xff\x00\x00\xff\x00\x00\x00\x00\x00\x00\x00\xff\xff\x00\x00\xff\x00\x00\x00\xff\x00\x00\x00\x00\xff\x00\x00\xff\x00\x00\xff\x00\x00\xff\x00\x00\xff\x00\x00'
+asjpg=io.BytesIO()
+img.save(asjpg,format='JPEG')
+img=Image.open(asjpg)
+    """
+    )