Merge pull request #619 from eliempje/master

Bugfix: EPS thumbnail failed

PIL/EpsImagePlugin.py

@@ -11,6 +11,7 @@
 # 1996-08-23 fl   Handle files from Macintosh (0.3)
 # 2001-02-17 fl   Use 're' instead of 'regex' (Python 2.1) (0.4)
 # 2003-09-07 fl   Check gs.close status (from Federico Di Gregorio) (0.5)
+# 2014-05-07 e    Handling of EPS with binary preview and fixed resolution resizing
 #
 # Copyright (c) 1997-2003 by Secret Labs AB.
 # Copyright (c) 1995-2003 by Fredrik Lundh
@@ -77,8 +78,9 @@ def Ghostscript(tile, size, fp, scale=1):
     orig_size = size
     orig_bbox = bbox
     size = (size[0] * scale, size[1] * scale)
-    bbox = [bbox[0], bbox[1], bbox[2] * scale, bbox[3] * scale]
+    # resolution is dependend on bbox and size
-    #print("Ghostscript", scale, size, orig_size, bbox, orig_bbox)
+    res = ( float((72.0 * size[0]) / (bbox[2]-bbox[0])), float((72.0 * size[1]) / (bbox[3]-bbox[1])) )
+    #print("Ghostscript", scale, size, orig_size, bbox, orig_bbox, res)
 
     import tempfile, os, subprocess
 
@@ -87,20 +89,29 @@ def Ghostscript(tile, size, fp, scale=1):
     in_fd, infile = tempfile.mkstemp()
     os.close(in_fd)
     
+    # ignore length and offset!
+    # ghostscript can read it   
+    # copy whole file to read in ghostscript
     with open(infile, 'wb') as f:
-        fp.seek(offset)
+        # fetch length of fp
-        while length >0:
+        fp.seek(0, 2)
-            s = fp.read(100*1024)
+        fsize = fp.tell()
+        # ensure start position
+        # go back
+        fp.seek(0)
+        lengthfile = fsize
+        while lengthfile > 0:
+            s = fp.read(min(lengthfile, 100*1024))
             if not s:
                 break
-            length = length - len(s)
+            lengthfile = lengthfile - len(s)
             f.write(s)
 
     # Build ghostscript command
     command = ["gs",
                "-q",                        # quiet mode
                "-g%dx%d" % size,            # set output geometry (pixels)
-               "-r%d" % (72*scale),         # set input DPI (dots per inch)
+               "-r%fx%f" % res,             # set input DPI (dots per inch)
                "-dNOPAUSE -dSAFER",         # don't pause between pages, safe mode
                "-sDEVICE=ppmraw",           # ppm driver
                "-sOutputFile=%s" % outfile, # output file
@@ -145,6 +156,8 @@ class PSFile:
         self.fp.seek(offset, whence)
     def read(self, count):
         return self.fp.read(count).decode('latin-1')
+    def readbinary(self, count):
+        return self.fp.read(count)
     def tell(self):
         pos = self.fp.tell()
         if self.char:
@@ -182,24 +195,32 @@ class EpsImageFile(ImageFile.ImageFile):
 
     def _open(self):
 
-        # FIXME: should check the first 512 bytes to see if this
-        # really is necessary (platform-dependent, though...)
-
         fp = PSFile(self.fp)
 
-        # HEAD
+        # FIX for: Some EPS file not handled correctly / issue #302 
-        s = fp.read(512)
+        # EPS can contain binary data
+        # or start directly with latin coding
+        # read header in both ways to handle both
+        # file types
+        # more info see http://partners.adobe.com/public/developer/en/ps/5002.EPSF_Spec.pdf
+        
+        # for HEAD without binary preview
+        s = fp.read(4)
+        # for HEAD with binary preview
+        fp.seek(0)
+        sb = fp.readbinary(160)
+
         if s[:4] == "%!PS":
-            offset = 0
             fp.seek(0, 2)
             length = fp.tell()
-        elif i32(s) == 0xC6D3D0C5:
+            offset = 0
-            offset = i32(s[4:])
+        elif i32(sb[0:4]) == 0xC6D3D0C5:
-            length = i32(s[8:])
+            offset = i32(sb[4:8])
-            fp.seek(offset)
+            length = i32(sb[8:12])
         else:
             raise SyntaxError("not an EPS file")
 
+        # go to offset - start of "%!PS" 
         fp.seek(offset)
         
         box = None

Tests/test_file_eps.py

@@ -1,25 +1,27 @@
 from tester import *
 
 from PIL import Image, EpsImagePlugin
-import sys
 import io
 
 if not EpsImagePlugin.has_ghostscript():
     skip()
 
-#Our two EPS test files (they are identical except for their bounding boxes)
+# Our two EPS test files (they are identical except for their bounding boxes)
 file1 = "Tests/images/zero_bb.eps"
 file2 = "Tests/images/non_zero_bb.eps"
 
-#Due to palletization, we'll need to convert these to RGB after load
+# Due to palletization, we'll need to convert these to RGB after load
 file1_compare = "Tests/images/zero_bb.png"
 file1_compare_scale2 = "Tests/images/zero_bb_scale2.png"
 
 file2_compare = "Tests/images/non_zero_bb.png"
 file2_compare_scale2 = "Tests/images/non_zero_bb_scale2.png"
 
+# EPS test files with binary preview
+file3 = "Tests/images/binary_preview_map.eps"
+
 def test_sanity():
-    #Regular scale
+    # Regular scale
     image1 = Image.open(file1)
     image1.load()
     assert_equal(image1.mode, "RGB")
@@ -32,7 +34,7 @@ def test_sanity():
     assert_equal(image2.size, (360, 252))
     assert_equal(image2.format, "EPS")
 
-    #Double scale
+    # Double scale
     image1_scale2 = Image.open(file1)
     image1_scale2.load(scale=2)
     assert_equal(image1_scale2.mode, "RGB")
@@ -45,54 +47,96 @@ def test_sanity():
     assert_equal(image2_scale2.size, (720, 504))
     assert_equal(image2_scale2.format, "EPS")
 
+
 def test_file_object():
-    #issue 479
+    # issue 479
     image1 = Image.open(file1)
     with open(tempfile('temp_file.eps'), 'wb') as fh:
         image1.save(fh, 'EPS')
 
+
 def test_iobase_object():
-    #issue 479
+    # issue 479
     image1 = Image.open(file1)
     with io.open(tempfile('temp_iobase.eps'), 'wb') as fh:
         image1.save(fh, 'EPS')
 
+
 def test_render_scale1():
-    #We need png support for these render test
+    # We need png support for these render test
     codecs = dir(Image.core)
     if "zip_encoder" not in codecs or "zip_decoder" not in codecs:
         skip("zip/deflate support not available")
 
-    #Zero bounding box
+    # Zero bounding box
     image1_scale1 = Image.open(file1)
     image1_scale1.load()
     image1_scale1_compare = Image.open(file1_compare).convert("RGB")
     image1_scale1_compare.load()
     assert_image_similar(image1_scale1, image1_scale1_compare, 5)
 
-    #Non-Zero bounding box
+    # Non-Zero bounding box
     image2_scale1 = Image.open(file2)
     image2_scale1.load()
     image2_scale1_compare = Image.open(file2_compare).convert("RGB")
     image2_scale1_compare.load()
     assert_image_similar(image2_scale1, image2_scale1_compare, 10)
 
+
 def test_render_scale2():
-    #We need png support for these render test
+    # We need png support for these render test
     codecs = dir(Image.core)
     if "zip_encoder" not in codecs or "zip_decoder" not in codecs:
         skip("zip/deflate support not available")
 
-    #Zero bounding box
+    # Zero bounding box
     image1_scale2 = Image.open(file1)
     image1_scale2.load(scale=2)
     image1_scale2_compare = Image.open(file1_compare_scale2).convert("RGB")
     image1_scale2_compare.load()
     assert_image_similar(image1_scale2, image1_scale2_compare, 5)
 
-    #Non-Zero bounding box
+    # Non-Zero bounding box
     image2_scale2 = Image.open(file2)
     image2_scale2.load(scale=2)
     image2_scale2_compare = Image.open(file2_compare_scale2).convert("RGB")
     image2_scale2_compare.load()
     assert_image_similar(image2_scale2, image2_scale2_compare, 10)
+
+
+def test_resize():
+    # Arrange
+    image1 = Image.open(file1)
+    image2 = Image.open(file2)
+    new_size = (100, 100)
+
+    # Act
+    image1 = image1.resize(new_size)
+    image2 = image2.resize(new_size)
+
+    # Assert
+    assert_equal(image1.size, new_size)
+    assert_equal(image2.size, new_size)
+
+
+def test_thumbnail():
+    # Issue #619
+    # Arrange
+    image1 = Image.open(file1)
+    image2 = Image.open(file2)
+    new_size = (100, 100)
+
+    # Act
+    image1.thumbnail(new_size)
+    image2.thumbnail(new_size)
+
+    # Assert
+    assert_equal(max(image1.size), max(new_size))
+    assert_equal(max(image2.size), max(new_size))
+
+def test_read_binary_preview():
+    # Issue 302
+    # open image with binary preview
+    image1 = Image.open(file3)
+
+# End of file