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Framework for image filters, alongwith an auto-trim filter

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Kovid Goyal 2013-12-05 17:45:53 +05:30
parent e80ce3f6d6
commit a7b7577fd1
5 changed files with 817 additions and 12 deletions
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80
src/calibre/gui2/tweak_book/editor/canvas.py
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@ -11,10 +11,12 @@ from functools import wraps
from PyQt4.Qt import (
QWidget, QPainter, QColor, QApplication, Qt, QPixmap, QRectF, QMatrix,
QPointF, QPen, pyqtSignal, QUndoCommand, QUndoStack, QIcon, QImage)
QPointF, QPen, pyqtSignal, QUndoCommand, QUndoStack, QIcon, QImage, QByteArray)
from calibre import fit_image
from calibre.gui2 import error_dialog, pixmap_to_data
from calibre.utils.config_base import tweaks
from calibre.utils.magick import Image
from calibre.utils.magick.draw import identify_data
def painter(func):
@ -50,8 +52,10 @@ class SelectionState(object):
class Command(QUndoCommand):
def __init__(self, text, canvas):
QUndoCommand.__init__(self, text)
TEXT = ''
def __init__(self, canvas):
QUndoCommand.__init__(self, self.TEXT)
self.canvas_ref = weakref.ref(canvas)
self.before_image = i = canvas.current_image
if i is None:
@ -76,12 +80,55 @@ def get_selection_rect(img, sr, target):
bottom_border = (abs(target.bottom() - sr.bottom())/target.height()) * img.height()
return left_border, top_border, img.width() - left_border - right_border, img.height() - top_border - bottom_border
_qimage_pixel_map = None
def get_pixel_map():
' Get the order of pixels in QImage (RGBA or BGRA usually) '
global _qimage_pixel_map
if _qimage_pixel_map is None:
i = QImage(1, 1, QImage.Format_ARGB32)
i.fill(QColor(0, 1, 2, 3))
raw = bytearray(i.constBits().asstring(4))
_qimage_pixel_map = {c:raw.index(x) for c, x in zip('RGBA', b'\x00\x01\x02\x03')}
_qimage_pixel_map = ''.join(sorted(_qimage_pixel_map, key=_qimage_pixel_map.get))
return _qimage_pixel_map
def qimage_to_magick(img):
fmt = get_pixel_map()
if not img.hasAlphaChannel():
if img.format() != img.Format_RGB32:
img = QImage(img)
img.setFormat(QImage.Format_RGB32)
fmt = fmt.replace('A', 'P')
else:
if img.format() != img.Format_ARGB32:
img = QImage(img)
img.setFormat(img.Format_ARGB32)
raw = img.constBits().ascapsule()
ans = Image()
ans.constitute(img.width(), img.height(), fmt, raw)
return ans
def magick_to_qimage(img):
fmt = get_pixel_map()
# ImageMagick can output only output raw data in some formats that can be
# read into QImage directly, if the QImage format is not one of those, use
# PNG
if fmt in {'RGBA', 'BGRA'}:
w, h = img.size
img.depth = 8 # QImage expects 8bpp
raw = img.export(fmt)
i = QImage(raw, w, h, QImage.Format_ARGB32)
del raw # According to the documentation, raw is supposed to not be deleted, but it works, so make it explicit
return i
else:
raw = img.export('PNG')
return QImage.fromData(QByteArray(raw), 'PNG')
class Trim(Command):
''' Remove the areas of the image outside the current selection. '''
def __init__(self, canvas):
Command.__init__(self, _('Trim image'), canvas)
TEXT = _('Trim image')
def __call__(self, canvas):
img = canvas.current_image
@ -89,10 +136,20 @@ class Trim(Command):
sr = canvas.selection_state.rect
return img.copy(*get_selection_rect(img, sr, target))
class AutoTrim(Trim):
''' Auto trim borders from the image '''
TEXT = _('Auto-trim image')
def __call__(self, canvas):
img = canvas.current_image
i = qimage_to_magick(img)
i.trim(tweaks['cover_trim_fuzz_value'])
return magick_to_qimage(i)
class Rotate(Command):
def __init__(self, canvas):
Command.__init__(self, _('Rotate image'), canvas)
TEXT = _('Rotate image')
def __call__(self, canvas):
img = canvas.current_image
@ -102,9 +159,11 @@ class Rotate(Command):
class Scale(Command):
TEXT = _('Resize image')
def __init__(self, width, height, canvas):
self.width, self.height = width, height
Command.__init__(self, _('Resize image'), canvas)
Command.__init__(self, canvas)
def __call__(self, canvas):
img = canvas.current_image
@ -247,6 +306,11 @@ class Canvas(QWidget):
self.undo_stack.push(Trim(self))
return True
@imageop
def autotrim_image(self):
self.undo_stack.push(AutoTrim(self))
return True
@imageop
def rotate_image(self):
self.undo_stack.push(Rotate(self))

12
src/calibre/gui2/tweak_book/editor/image.py
View File

@ -11,7 +11,7 @@ from functools import partial
from PyQt4.Qt import (
QMainWindow, Qt, QApplication, pyqtSignal, QLabel, QIcon, QFormLayout,
QDialog, QSpinBox, QCheckBox, QDialogButtonBox)
QDialog, QSpinBox, QCheckBox, QDialogButtonBox, QToolButton, QMenu)
from calibre.gui2 import error_dialog
from calibre.gui2.tweak_book import actions
@ -200,7 +200,7 @@ class Editor(QMainWindow):
self.copy_available_state_changed.emit(self.copy_available)
self.data_changed.emit(self)
self.modification_state_changed.emit(True)
self.fmt_label.setText((self.canvas.original_image_format or '').upper())
self.fmt_label.setText(' ' + (self.canvas.original_image_format or '').upper())
im = self.canvas.current_image
self.size_label.setText('{0} x {1}{2}'.format(im.width(), im.height(), ' px'))
@ -229,7 +229,7 @@ class Editor(QMainWindow):
try:
ac = actions['editor-%s' % x]
except KeyError:
b.addAction(x, getattr(self.canvas, x))
setattr(self, 'action_' + x, b.addAction(x, getattr(self.canvas, x)))
else:
setattr(self, 'action_' + x, b.addAction(ac.icon(), x, getattr(self, x)))
self.update_clipboard_actions()
@ -238,6 +238,12 @@ class Editor(QMainWindow):
self.action_trim = ac = b.addAction(QIcon(I('trim.png')), _('Trim image'), self.canvas.trim_image)
self.action_rotate = ac = b.addAction(QIcon(I('rotate-right.png')), _('Rotate image'), self.canvas.rotate_image)
self.action_resize = ac = b.addAction(QIcon(I('resize.png')), _('Resize image'), self.resize_image)
b.addSeparator()
self.action_filters = ac = b.addAction(QIcon(I('filter.png')), _('Image filters'))
b.widgetForAction(ac).setPopupMode(QToolButton.InstantPopup)
self.filters_menu = m = QMenu()
ac.setMenu(m)
m.addAction(_('Auto-trim image'), self.canvas.autotrim_image)
self.info_bar = b = self.addToolBar(_('Image information bar'))
self.fmt_label = QLabel('')

33
src/calibre/utils/magick/magick.c
View File

@ -537,6 +537,35 @@ magick_Image_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
return (PyObject *)self;
}
// Image.constitute {{{
static PyObject *
magick_Image_constitute(magick_Image *self, PyObject *args) {
const char *map;
Py_ssize_t width, height;
PyObject *capsule;
MagickBooleanType res;
void *data;
NULL_CHECK(NULL)
if (!PyArg_ParseTuple(args, "iisO", &width, &height, &map, &capsule)) return NULL;
if (!PyCapsule_CheckExact(capsule)) {
PyErr_SetString(PyExc_TypeError, "data is not a capsule object");
return NULL;
}
data = PyCapsule_GetPointer(capsule, PyCapsule_GetName(capsule));
if (data == NULL) return NULL;
res = MagickConstituteImage(self->wand, width, height, map, CharPixel, data);
if (!res)
return magick_set_exception(self->wand);
Py_RETURN_NONE;
}
// }}}
// Image.load {{{
static PyObject *
@ -1296,6 +1325,10 @@ static PyMethodDef magick_Image_methods[] = {
"Identify an image from a byte buffer (string)"
},
{"constitute", (PyCFunction)magick_Image_constitute, METH_VARARGS,
"constitute(width, height, map, data) -> Create an image from raw (A)RGB data. map should be 'ARGB' or 'PRGB' or whatever is needed for data. data must be a PyCapsule object."
},
{"load", (PyCFunction)magick_Image_load, METH_VARARGS,
"Load an image from a byte buffer (string)"
},