def __getitem__(self, point):
point = Vector.coerce(point)
px = ffi.new("PixelPacket *")
# TODO retval is t/f
with magick_try() as exc:
lib.GetOneCacheViewAuthenticPixel(self._ptr, point.x, point.y, px, exc.ptr)
array = ffi.new("double[]", 4)
lib.sanpera_pixel_to_doubles(px, array)
return RGBColor(*array)
def __call__(self, *frames, **kwargs):
channel = kwargs.get('channel', lib.DefaultChannels)
c_channel = ffi.cast('ChannelType', channel)
steps = ffi.new("sanpera_evaluate_step[]", self.compiled_steps)
c_frames = ffi.new("Image *[]", [f._frame for f in frames] + [ffi.NULL])
with magick_try() as exc:
new_frame = ffi.gc(
lib.sanpera_evaluate_filter(c_frames, steps, c_channel, exc.ptr),
lib.DestroyImageList)
return Image(new_frame)
def __getitem__(self, point):
point = Vector.coerce(point)
px = ffi.new("PixelPacket *")
# TODO retval is t/f
with magick_try() as exc:
lib.GetOneCacheViewAuthenticPixel(self._ptr, point.x, point.y, px,
exc.ptr)
array = ffi.new("double[]", 4)
lib.sanpera_pixel_to_doubles(px, array)
return RGBColor(*array)
def __call__(self, *frames, **kwargs):
channel = kwargs.get('channel', lib.DefaultChannels)
c_channel = ffi.cast('ChannelType', channel)
steps = ffi.new("sanpera_evaluate_step[]", self.compiled_steps)
c_frames = ffi.new("Image *[]", [f._frame for f in frames] + [ffi.NULL])
with magick_try() as exc:
# TODO can this raise an exception /but also/ return a new value?
# is that a thing i should be handling better
new_frame = lib.sanpera_evaluate_filter(
c_frames, steps, c_channel, exc.ptr)
return Image(new_frame)
def __setitem__(self, point, color):
"""Set a single pixel to a given color.
This is "slow", in the sense that you probably don't want to do this to
edit every pixel in an entire image.
"""
point = Vector.coerce(point)
rgb = color.rgb()
# TODO retval is t/f
with magick_try() as exc:
# Surprise! GetOneCacheViewAuthenticPixel doesn't actually respect
# writes, even though the docs explicitly says it does.
# So get a view of this single pixel instead.
px = lib.GetCacheViewAuthenticPixels(self._ptr, point.x, point.y,
1, 1, exc.ptr)
exc.check(px == ffi.NULL)
array = ffi.new("double[]",
[rgb._red, rgb._green, rgb._blue, rgb._opacity])
lib.sanpera_pixel_from_doubles(px, array)
#print(repr(ffi.buffer(ffi.cast("char*", ffi.cast("void*", px)), 16)[:]))
with magick_try() as exc:
assert lib.SyncCacheViewAuthenticPixels(self._ptr, exc.ptr)
def color(self, value):
if self._pixel == ffi.NULL:
raise ValueError("Pixel has expired")
array = ffi.new(
"double[]",
[value._red, value._green, value._blue, value._opacity])
lib.sanpera_pixel_from_doubles(self._pixel, array)
def color(self):
# XXX this needs to do something special to handle non-rgba images
if self._pixel == ffi.NULL:
raise ValueError("Pixel has expired")
array = ffi.new("double[]", 4)
lib.sanpera_pixel_to_doubles(self._pixel, array)
return RGBColor(*array)
def _get_formats():
formats = dict()
formats_by_mime = dict()
num_formats = ffi.new("size_t *")
# Snag the list of known supported image formats
with magick_try() as exc:
magick_infos = ffi.gc(
lib.GetMagickInfoList(b"*", num_formats, exc.ptr),
lib.RelinquishMagickMemory)
for i in range(num_formats[0]):
imageformat = ImageFormat(
name=ffi.string(magick_infos[i].name).decode('latin-1'),
description=ffi.string(magick_infos[i].description).decode('latin-1'),
can_read=magick_infos[i].decoder != ffi.NULL,
can_write=magick_infos[i].encoder != ffi.NULL,
supports_frames=magick_infos[i].adjoin != 0,
mime_type=ffi.string(magick_infos[i].mime_type).decode('ascii') if magick_infos[i].mime_type else None,
)
formats[imageformat.name.lower()] = imageformat
formats_by_mime[imageformat.mime_type] = imageformat
return formats, formats_by_mime
def _from_pixel(cls, pixel):
"""Create a color from a PixelPacket."""
array = ffi.new("double[]", 4)
lib.sanpera_pixel_to_doubles(pixel, array)
# Okay, yes, this isn't much of a classmethod. TODO?
return RGBColor._from_c_array(array)
def to_rect_info(self):
rectinfo = ffi.new("RectangleInfo *")
rectinfo.x = self.left
rectinfo.y = self.top
rectinfo.width = self.width
rectinfo.height = self.height
return rectinfo
def to_rect_info(self):
rectinfo = ffi.new("RectangleInfo *")
rectinfo.x = self.left
rectinfo.y = self.top
rectinfo.width = self.width
rectinfo.height = self.height
return rectinfo
def _get_formats():
formats = dict()
num_formats = ffi.new("size_t *")
# Snag the list of known supported image formats
with magick_try() as exc:
magick_infos = ffi.gc(lib.GetMagickInfoList(b"*", num_formats, exc.ptr), lib.RelinquishMagickMemory)
# Sometimes this call can generate an exception (such as a module not
# being loadable) but then succeed anyway and return a useful value, in
# which case we want to ignore the exception
if magick_infos != ffi.NULL:
exc.clear()
for i in range(num_formats[0]):
name = ffi.string(magick_infos[i].name).decode("latin-1")
formats[name.lower()] = ImageFormat(
name=name,
description=ffi.string(magick_infos[i].description).decode("latin-1"),
can_read=magick_infos[i].decoder != ffi.NULL,
can_write=magick_infos[i].encoder != ffi.NULL,
supports_frames=magick_infos[i].adjoin != 0,
)
return formats
def _from_pixel(cls, pixel):
"""Create a color from a PixelPacket."""
array = ffi.new("double[]", 4)
lib.sanpera_pixel_to_doubles(pixel, array)
# Okay, yes, this isn't much of a classmethod. TODO?
return RGBColor._from_c_array(array)
def to_buffer(self, format=None):
if not self._frames:
raise EmptyImageError
image_info = blank_image_info()
length = ffi.new("size_t *")
# Force writing to a single file
image_info.adjoin = lib.MagickTrue
# Stupid hack to fix a bug in the rgb codec
if format == 'rgba':
for frame in self._frames:
frame._fix_for_rgba_codec()
if format:
# If the caller provided an explicit format, pass it along
# Make sure not to overflow the char[]
# TODO maybe just error out when this happens
image_info.magick = format.encode('ascii')[:lib.MaxTextExtent]
elif self._stack.magick[0] == b'\0':
# Uhoh; no format provided and nothing given by caller
raise MissingFormatError
with magick_try() as exc:
with self._link_frames(self._frames) as ptr:
cbuf = ffi.gc(
lib.ImagesToBlob(image_info, ptr, length, exc.ptr),
lib.RelinquishMagickMemory)
return ffi.buffer(cbuf, length[0])
def color(self):
# XXX this needs to do something special to handle non-rgba images
if self._pixel == ffi.NULL:
raise ValueError("Pixel has expired")
array = ffi.new("double[]", 4)
lib.sanpera_pixel_to_doubles(self._pixel, array)
return RGBColor(*array)
def to_buffer(self, format=None):
if not self._frames:
raise EmptyImageError
image_info = blank_image_info()
length = ffi.new("size_t *")
# Force writing to a single file
image_info.adjoin = lib.MagickTrue
# Stupid hack to fix a bug in the rgb codec
if format == 'rgba':
for frame in self._frames:
frame._fix_for_rgba_codec()
if format:
# If the caller provided an explicit format, pass it along
# Make sure not to overflow the char[]
# TODO maybe just error out when this happens
image_info.magick = format.encode('ascii')[:lib.MaxTextExtent]
elif self._stack.magick[0] == b'\0':
# Uhoh; no format provided and nothing given by caller
raise MissingFormatError
with magick_try() as exc:
with self._link_frames(self._frames) as ptr:
cbuf = ffi.gc(
lib.ImagesToBlob(image_info, ptr, length, exc.ptr),
lib.RelinquishMagickMemory)
return ffi.buffer(cbuf, length[0])
def op_color(color):
_color = ffi.new("PixelPacket *")
color._populate_pixel(_color)
return dict(
op=lib.SANPERA_OP_LOAD_COLOR,
color=_color,
number=0.,
)
def __init__(self, red, green, blue, opacity=1.0, _array=None):
self._red = red
self._green = green
self._blue = blue
self._opacity = opacity
self._extra_channels = ()
if _array is None:
self._array = ffi.new("double[]", [red, green, blue, opacity])
else:
self._array = _array
def __init__(self, red, green, blue, opacity=1.0, _array=None):
self._red = red
self._green = green
self._blue = blue
self._opacity = opacity
self._extra_channels = ()
if _array is None:
self._array = ffi.new("double[]", [red, green, blue, opacity])
else:
self._array = _array
def __call__(self, frame, **kwargs):
channel = kwargs.get('channel', lib.DefaultChannels)
# This is incredibly stupid, but yes, ColorizeImage only accepts a
# string for the opacity.
opacity = str(self._amount * 100.).encode('ascii') + b"%"
color = ffi.new("PixelPacket *")
self._color._populate_pixel(color)
with magick_try() as exc:
# TODO what if this raises but doesn't return NULL
# TODO in general i need to figure out when i use gc and do it
# consistently
return lib.ColorizeImage(frame._frame, opacity, color[0], exc.ptr)
def cropped(self, rect, preserve_canvas=False):
rectinfo = rect.to_rect_info()
p = self._stack
new_stack_ptr = ffi.new("Image **", ffi.NULL)
while p:
with magick_try() as exc:
new_frame = lib.CropImage(p, rectinfo, exc.ptr)
# Only GC the first frame in the stack, since the others will be
# in the same list and thus nuked automatically
if new_stack_ptr == ffi.NULL:
new_frame = ffi.gc(new_frame, lib.DestroyImageList)
lib.AppendImageToList(new_stack_ptr, new_frame)
p = lib.GetNextImageInList(p)
new = type(self)(new_stack_ptr[0])
# Repage by default after a crop; not doing this is unexpected and
# frankly insane. Plain old `+repage` behavior would involve nuking
# the page entirely, but that would screw up multiple frames; instead,
# shift the canvas for every frame so the crop region's upper left
# corner is the new origin, and fix the dimensions so every frame fits
# (up to the size of the crop area, though ImageMagick should never
# return an image bigger than the crop area... right?)
if not preserve_canvas:
# ImageMagick actually behaves when the crop area extends out
# beyond the origin, so don't fix the edges in that case
# TODO this is complex enough that i should perhaps just do it
# myself
left_delta = max(rect.left, 0)
top_delta = max(rect.top, 0)
# New canvas should be the size of the overlap between the current
# canvas and the crop area
new_canvas = rect.intersection(self.size.at(origin))
new_height = new_canvas.height
new_width = new_canvas.width
for frame in new:
frame._frame.page.x -= left_delta
frame._frame.page.y -= top_delta
frame._frame.page.height = new_height
frame._frame.page.width = new_width
return new
def cropped(self, rect, preserve_canvas=False):
rectinfo = rect.to_rect_info()
p = self._stack
new_stack_ptr = ffi.new("Image **", ffi.NULL)
while p:
with magick_try() as exc:
new_frame = lib.CropImage(p, rectinfo, exc.ptr)
# Only GC the first frame in the stack, since the others will be
# in the same list and thus nuked automatically
if new_stack_ptr == ffi.NULL:
new_frame = ffi.gc(new_frame, lib.DestroyImageList)
lib.AppendImageToList(new_stack_ptr, new_frame)
p = lib.GetNextImageInList(p)
new = type(self)(new_stack_ptr[0])
# Repage by default after a crop; not doing this is unexpected and
# frankly insane. Plain old `+repage` behavior would involve nuking
# the page entirely, but that would screw up multiple frames; instead,
# shift the canvas for every frame so the crop region's upper left
# corner is the new origin, and fix the dimensions so every frame fits
# (up to the size of the crop area, though ImageMagick should never
# return an image bigger than the crop area... right?)
if not preserve_canvas:
# ImageMagick actually behaves when the crop area extends out
# beyond the origin, so don't fix the edges in that case
# TODO this is complex enough that i should perhaps just do it
# myself
left_delta = max(rect.left, 0)
top_delta = max(rect.top, 0)
# New canvas should be the size of the overlap between the current
# canvas and the crop area
new_canvas = rect.intersection(self.size.at(origin))
new_height = new_canvas.height
new_width = new_canvas.width
for frame in new:
frame._frame.page.x -= left_delta
frame._frame.page.y -= top_delta
frame._frame.page.height = new_height
frame._frame.page.width = new_width
return new
def parse(cls, name):
"""Parse a color specification.
Supports a whole buncha formats.
"""
# TODO i don't like that this is tied to imagemagick's implementation.
# would rather do most of the parsing myself, well-define what those
# formats *are*, and use some other mechanism to expose the list of
# builtin color names. (maybe several lists, even.)
# TODO also this always returns RGB anyway.
pixel = ffi.new("PixelPacket *")
with magick_try() as exc:
success = lib.QueryColorDatabase(name.encode('ascii'), pixel, exc.ptr)
if not success:
raise ValueError("Can't find a color named {0!r}".format(name))
return cls._from_pixel(pixel)
def gradient(self, from_color, to_color):
gradient_info = self.draw_info.gradient
gradient_info.type = lib.LinearGradient
width = self.frame._frame.columns
height = self.frame._frame.rows
# Fit bounding box to the size of the image itself
gradient_info.bounding_box.x = 0
gradient_info.bounding_box.y = 0
gradient_info.bounding_box.width = width
gradient_info.bounding_box.height = height
# Draw it vertically for now
gradient_info.gradient_vector.x1 = 0.
gradient_info.gradient_vector.y1 = 0.
gradient_info.gradient_vector.x2 = 0.
gradient_info.gradient_vector.y2 = height - 1.
gradient_info.spread = lib.PadSpread
gradient_info.center.x = width / 2
gradient_info.center.y = height / 2
gradient_info.radius = lib.sanpera_to_magick_real_type(
max(width, height) / 2)
# Construct some stops
stops = ffi.new("StopInfo[]", 2)
from_color._populate_magick_pixel(ffi.addressof(stops[0], "color"))
stops[0].offset = lib.sanpera_to_magick_real_type(0.)
to_color._populate_magick_pixel(ffi.addressof(stops[1], "color"))
stops[1].offset = lib.sanpera_to_magick_real_type(1.)
try:
gradient_info.stops = stops
gradient_info.number_stops = 2
lib.DrawGradientImage(self.frame._frame, self.draw_info)
finally:
gradient_info.stops = ffi.NULL
gradient_info.number_stops = 0
def gradient(self, from_color, to_color):
gradient_info = self.draw_info.gradient
gradient_info.type = lib.LinearGradient
width = self.frame._frame.columns
height = self.frame._frame.rows
# Fit bounding box to the size of the image itself
gradient_info.bounding_box.x = 0
gradient_info.bounding_box.y = 0
gradient_info.bounding_box.width = width
gradient_info.bounding_box.height = height
# Draw it vertically for now
gradient_info.gradient_vector.x1 = 0.
gradient_info.gradient_vector.y1 = 0.
gradient_info.gradient_vector.x2 = 0.
gradient_info.gradient_vector.y2 = height - 1.
gradient_info.spread = lib.PadSpread
gradient_info.center.x = width / 2
gradient_info.center.y = height / 2
gradient_info.radius = lib.sanpera_to_magick_real_type(max(width, height) / 2)
# Construct some stops
stops = ffi.new("StopInfo[]", 2)
from_color._populate_magick_pixel(ffi.addressof(stops[0], "color"))
stops[0].offset = lib.sanpera_to_magick_real_type(0.)
to_color._populate_magick_pixel(ffi.addressof(stops[1], "color"))
stops[1].offset = lib.sanpera_to_magick_real_type(1.)
try:
gradient_info.stops = stops
gradient_info.number_stops = 2
lib.DrawGradientImage(self.frame._frame, self.draw_info)
finally:
gradient_info.stops = ffi.NULL
gradient_info.number_stops = 0
def parse(cls, name):
"""Parse a color specification.
Supports a whole buncha formats.
"""
# TODO i don't like that this is tied to imagemagick's implementation.
# would rather do most of the parsing myself, well-define what those
# formats *are*, and use some other mechanism to expose the list of
# builtin color names. (maybe several lists, even.)
# TODO also this always returns RGB anyway.
pixel = ffi.new("PixelPacket *")
with magick_try() as exc:
success = lib.QueryColorDatabase(name.encode('ascii'), pixel,
exc.ptr)
if not success:
raise ValueError("Can't find a color named {0!r}".format(name))
return cls._from_pixel(pixel)
def _get_formats():
formats = dict()
num_formats = ffi.new("size_t *")
# Snag the list of known supported image formats
with magick_try() as exc:
magick_infos = ffi.gc(
lib.GetMagickInfoList(b"*", num_formats, exc.ptr),
lib.RelinquishMagickMemory)
for i in range(num_formats[0]):
name = ffi.string(magick_infos[i].name).decode('latin-1')
formats[name.lower()] = ImageFormat(
name=name,
description=ffi.string(
magick_infos[i].description).decode('latin-1'),
can_read=magick_infos[i].decoder != ffi.NULL,
can_write=magick_infos[i].encoder != ffi.NULL,
supports_frames=magick_infos[i].adjoin != 0,
)
return formats
def __setitem__(self, point, color):
"""Set a single pixel to a given color.
This is "slow", in the sense that you probably don't want to do this to
edit every pixel in an entire image.
"""
point = Vector.coerce(point)
rgb = color.rgb()
# TODO retval is t/f
with magick_try() as exc:
# Surprise! GetOneCacheViewAuthenticPixel doesn't actually respect
# writes, even though the docs explicitly says it does.
# So get a view of this single pixel instead.
px = lib.GetCacheViewAuthenticPixels(
self._ptr, point.x, point.y, 1, 1, exc.ptr)
exc.check(px == ffi.NULL)
array = ffi.new("double[]", [rgb._red, rgb._green, rgb._blue, rgb._opacity])
lib.sanpera_pixel_from_doubles(px, array)
#print(repr(ffi.buffer(ffi.cast("char*", ffi.cast("void*", px)), 16)[:]))
with magick_try() as exc:
assert lib.SyncCacheViewAuthenticPixels(self._ptr, exc.ptr)
from __future__ import division
from __future__ import print_function
from collections import namedtuple
from sanpera._api import ffi, lib
from sanpera.exception import magick_try
FEATURES = frozenset(
ffi.string(lib.GetMagickFeatures()).decode('ascii').split(' '))
HAS_OPENMP = 'OpenMP' in FEATURES
HAS_OPENCL = 'OpenCL' in FEATURES
HAS_HDRI = 'HDRI' in FEATURES
# Version number is given as hex; version A.B.C is 0xABC
_out = ffi.new("size_t *")
lib.GetMagickVersion(_out)
VERSION = (
(_out[0] & 0xf00) >> 8,
(_out[0] & 0x0f0) >> 4,
(_out[0] & 0x00f) >> 0,
)
del _out
ImageFormat = namedtuple(
'ImageFormat',
['name', 'description', 'can_read', 'can_write', 'supports_frames'])
def _get_formats():
formats = dict()
def blank_magick_pixel():
magick_pixel = ffi.new("MagickPixelPacket *")
lib.GetMagickPixelPacket(ffi.NULL, magick_pixel)
return magick_pixel
def color(self, value):
if self._pixel == ffi.NULL:
raise ValueError("Pixel has expired")
array = ffi.new("double[]", [value._red, value._green, value._blue, value._opacity])
lib.sanpera_pixel_from_doubles(self._pixel, array)
def resized(self, size, filter=None):
size = Size.coerce(size)
# TODO allow picking a filter
# TODO allow messing with blur?
p = self._stack
new_stack_ptr = ffi.new("Image **", ffi.NULL)
if filter == 'box':
c_filter = lib.BoxFilter
else:
c_filter = lib.UndefinedFilter
target_width = size.width
target_height = size.height
ratio_width = target_width / (self._stack.page.width
or self._stack.columns)
ratio_height = target_height / (self._stack.page.height
or self._stack.rows)
while p:
# Alrighty, so. ResizeImage takes the given size as the new size
# of the FRAME, rather than the CANVAS, which is almost certainly
# not what anyone expects. So do the math to fix this manually,
# converting from canvas size to frame size.
frame_width = int(p.columns * ratio_width + 0.5)
frame_height = int(p.rows * ratio_height + 0.5)
# ImageMagick, brilliant as it is, does not scale non-linear colorspaces
# correctly. This definitely affects sRGB (see Issue-23) and may affect
# other colorspaces. The "helpful" solution is to preconvert to linear RGB,
# and postconvert to the original value. See also:
# http://www.imagemagick.org/script/color-management.php
inputImage = p
with magick_try() as exc:
# Assume ImageMagick will do the dumbest possible thing to non-RGB spaces.
# TODO: But maybe we can trust it a bit more?
if p.colorspace != lib.RGBColorspace:
inputImage = lib.CloneImage(p, 0, 0, 0, exc.ptr)
lib.TransformImageColorspace(inputImage, lib.RGBColorspace)
if c_filter == lib.BoxFilter:
# Use the faster ScaleImage in this special case
new_frame = lib.ScaleImage(inputImage, frame_width,
frame_height, exc.ptr)
else:
new_frame = lib.ResizeImage(inputImage, frame_width,
frame_height, c_filter, 1.0,
exc.ptr)
if new_frame.colorspace != p.colorspace:
lib.TransformImageColorspace(new_frame, p.colorspace)
if inputImage != p:
lib.DestroyImage(inputImage)
# TODO how do i do this correctly etc? will it ever be non-null??
#except Exception:
# lib.DestroyImage(new_frame)
# ImageMagick uses new_size/old_size to compute the resized frame's
# position. But new_size has already been rounded, so for small
# frames in a large image, the double rounding error can place the
# new frame a noticable distance from where one might expect. Fix
# the canvas manually, too.
new_frame.page.width = target_width
new_frame.page.height = target_height
new_frame.page.x = int(p.page.x * ratio_width + 0.5)
new_frame.page.y = int(p.page.y * ratio_height + 0.5)
lib.AppendImageToList(new_stack_ptr, new_frame)
p = lib.GetNextImageInList(p)
return type(self)(new_stack_ptr[0])
def resized(self, size, filter=None):
size = Size.coerce(size)
# TODO allow picking a filter
# TODO allow messing with blur?
p = self._stack
new_stack_ptr = ffi.new("Image **", ffi.NULL)
if filter == "box":
c_filter = lib.BoxFilter
else:
c_filter = lib.UndefinedFilter
target_width = size.width
target_height = size.height
ratio_width = target_width / (self._stack.page.width or self._stack.columns)
ratio_height = target_height / (self._stack.page.height or self._stack.rows)
while p:
# Alrighty, so. ResizeImage takes the given size as the new size
# of the FRAME, rather than the CANVAS, which is almost certainly
# not what anyone expects. So do the math to fix this manually,
# converting from canvas size to frame size.
frame_width = int(p.columns * ratio_width + 0.5)
frame_height = int(p.rows * ratio_height + 0.5)
# ImageMagick, brilliant as it is, does not scale non-linear colorspaces
# correctly. This definitely affects sRGB (see Issue-23) and may affect
# other colorspaces. The "helpful" solution is to preconvert to linear RGB,
# and postconvert to the original value. See also:
# http://www.imagemagick.org/script/color-management.php
inputImage = p
with magick_try() as exc:
# Assume ImageMagick will do the dumbest possible thing to non-RGB spaces.
# TODO: But maybe we can trust it a bit more?
if p.colorspace != lib.RGBColorspace:
inputImage = lib.CloneImage(p, 0, 0, 0, exc.ptr)
lib.TransformImageColorspace(inputImage, lib.RGBColorspace)
if c_filter == lib.BoxFilter:
# Use the faster ScaleImage in this special case
new_frame = lib.ScaleImage(inputImage, frame_width, frame_height, exc.ptr)
else:
new_frame = lib.ResizeImage(inputImage, frame_width, frame_height, c_filter, 1.0, exc.ptr)
if new_frame.colorspace != p.colorspace:
lib.TransformImageColorspace(new_frame, p.colorspace)
if inputImage != p:
lib.DestroyImage(inputImage)
# TODO how do i do this correctly etc? will it ever be non-null??
# except Exception:
# lib.DestroyImage(new_frame)
# ImageMagick uses new_size/old_size to compute the resized frame's
# position. But new_size has already been rounded, so for small
# frames in a large image, the double rounding error can place the
# new frame a noticable distance from where one might expect. Fix
# the canvas manually, too.
new_frame.page.width = target_width
new_frame.page.height = target_height
new_frame.page.x = int(p.page.x * ratio_width + 0.5)
new_frame.page.y = int(p.page.y * ratio_height + 0.5)
lib.AppendImageToList(new_stack_ptr, new_frame)
p = lib.GetNextImageInList(p)
return type(self)(new_stack_ptr[0])
def resized(self, size, filter=None):
size = Size.coerce(size)
# TODO allow picking a filter
# TODO allow messing with blur?
p = self._stack
new_stack_ptr = ffi.new("Image **", ffi.NULL)
if filter == 'box':
c_filter = lib.BoxFilter
else:
c_filter = lib.UndefinedFilter
target_width = size.width
target_height = size.height
ratio_width = target_width / (self._stack.page.width or self._stack.columns)
ratio_height = target_height / (self._stack.page.height or self._stack.rows)
while p:
# Alrighty, so. ResizeImage takes the given size as the new size
# of the FRAME, rather than the CANVAS, which is almost certainly
# not what anyone expects. So do the math to fix this manually,
# converting from canvas size to frame size.
frame_width = int(p.columns * ratio_width + 0.5)
frame_height = int(p.rows * ratio_height + 0.5)
# Imagemagick seems to consider sRGB (nonlinear) to be the default colorspace
# for images without colorspace information. In doing so, it might mangle colors
# during some operations which expect a linear colorspace. It also seems to prefer
# sRGB as output, rather than using the input colorspace.
# See also:
# http://www.imagemagick.org/script/color-management.php
inputImage = p
with magick_try() as exc:
if c_filter == lib.BoxFilter:
# Use the faster ScaleImage in this special case
new_frame = lib.ScaleImage(
inputImage, frame_width, frame_height, exc.ptr)
else:
new_frame = lib.ResizeImage(
inputImage, frame_width, frame_height,
c_filter, 1.0, exc.ptr)
if new_frame.colorspace != p.colorspace and p.colorspace != lib.UndefinedColorspace:
lib.TransformImageColorspace(new_frame, p.colorspace)
if inputImage != p:
lib.DestroyImage(inputImage)
# TODO how do i do this correctly etc? will it ever be non-null??
#except Exception:
# lib.DestroyImage(new_frame)
# ImageMagick uses new_size/old_size to compute the resized frame's
# position. But new_size has already been rounded, so for small
# frames in a large image, the double rounding error can place the
# new frame a noticable distance from where one might expect. Fix
# the canvas manually, too.
new_frame.page.width = target_width
new_frame.page.height = target_height
new_frame.page.x = int(p.page.x * ratio_width + 0.5)
new_frame.page.y = int(p.page.y * ratio_height + 0.5)
lib.AppendImageToList(new_stack_ptr, new_frame)
p = lib.GetNextImageInList(p)
return type(self)(new_stack_ptr[0])
def blank_magick_pixel():
magick_pixel = ffi.new("MagickPixelPacket *")
lib.GetMagickPixelPacket(ffi.NULL, magick_pixel)
return magick_pixel
from __future__ import division
from __future__ import print_function
from collections import namedtuple
from sanpera._api import ffi, lib
from sanpera.exception import magick_try
FEATURES = frozenset(ffi.string(lib.GetMagickFeatures()).decode('ascii').split(' '))
HAS_OPENMP = 'OpenMP' in FEATURES
HAS_OPENCL = 'OpenCL' in FEATURES
HAS_HDRI = 'HDRI' in FEATURES
# Version number is given as hex; version A.B.C is 0xABC
_out = ffi.new("size_t *")
lib.GetMagickVersion(_out)
VERSION = (
(_out[0] & 0xf00) >> 8,
(_out[0] & 0x0f0) >> 4,
(_out[0] & 0x00f) >> 0,
)
del _out
ImageFormat = namedtuple(
'ImageFormat',
['name', 'description', 'can_read', 'can_write', 'supports_frames'])
def _get_formats():
formats = dict()
