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Added a way to specify the render size for EPS files.

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There is now a scale parameter that you can pass in to the EpsImageFile.load() function. This parameter is used to specify at what scale Ghostscript renders the EPS internally. Scale needs to be an integer, and all of the internal structures (image size and bounding box) are scaled based on that parameter.
This commit is contained in:
Esteban Santana Santana 2013-11-17 01:26:44 -06:00
parent f44f4efb68
commit 7989378bfd
1 changed files with 12 additions and 3 deletions
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15
PIL/EpsImagePlugin.py
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@ -50,13 +50,21 @@ if sys.platform.startswith('win'):
else: else:
gs_windows_binary = False gs_windows_binary = False
def Ghostscript(tile, size, fp): def Ghostscript(tile, size, fp, scale=1):
"""Render an image using Ghostscript""" """Render an image using Ghostscript"""
# Unpack decoder tile # Unpack decoder tile
decoder, tile, offset, data = tile[0] decoder, tile, offset, data = tile[0]
length, bbox = data length, bbox = data
#Hack to support hi-res rendering
scale = int(scale) or 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]
#print("Ghostscript", scale, size, orig_size, bbox, orig_bbox)
import tempfile, os import tempfile, os
file = tempfile.mktemp() file = tempfile.mktemp()
@ -65,6 +73,7 @@ def Ghostscript(tile, size, fp):
command = ["gs", command = ["gs",
"-q", # quite mode "-q", # quite mode
"-g%dx%d" % size, # set output geometry (pixels) "-g%dx%d" % size, # set output geometry (pixels)
"-r%d" % (72*scale), # set input DPI (dots per inch)
"-dNOPAUSE -dSAFER", # don't pause between pages, safe mode "-dNOPAUSE -dSAFER", # don't pause between pages, safe mode
"-sDEVICE=ppmraw", # ppm driver "-sDEVICE=ppmraw", # ppm driver
"-sOutputFile=%s" % file,# output file "-sOutputFile=%s" % file,# output file
@ -304,11 +313,11 @@ class EpsImageFile(ImageFile.ImageFile):
if not box: if not box:
raise IOError("cannot determine EPS bounding box") raise IOError("cannot determine EPS bounding box")
def load(self): def load(self, scale=1):
# Load EPS via Ghostscript # Load EPS via Ghostscript
if not self.tile: if not self.tile:
return return
self.im = Ghostscript(self.tile, self.size, self.fp) self.im = Ghostscript(self.tile, self.size, self.fp, scale)
self.mode = self.im.mode self.mode = self.im.mode
self.size = self.im.size self.size = self.im.size
self.tile = [] self.tile = []