%PDF-
%PDF-
Mini Shell
Mini Shell
#!/usr/bin/env python3
__license__ = 'GPL v3'
__copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
import sys, weakref
from functools import wraps
from io import BytesIO
from qt.core import (
QWidget, QPainter, QColor, QApplication, Qt, QPixmap, QRectF, QTransform,
QPointF, QPen, pyqtSignal, QUndoCommand, QUndoStack, QIcon, QImage,
QImageWriter)
from calibre import fit_image
from calibre.gui2 import error_dialog, pixmap_to_data
from calibre.gui2.dnd import (
image_extensions, dnd_has_extension, dnd_has_image, dnd_get_image, DownloadDialog)
from calibre.gui2.tweak_book import capitalize
from calibre.utils.imghdr import identify
from calibre.utils.img import (
remove_borders_from_image, gaussian_sharpen_image, gaussian_blur_image, image_to_data, despeckle_image,
normalize_image, oil_paint_image
)
def painter(func):
@wraps(func)
def ans(self, painter):
painter.save()
try:
return func(self, painter)
finally:
painter.restore()
return ans
class SelectionState:
__slots__ = ('last_press_point', 'current_mode', 'rect', 'in_selection', 'drag_corner', 'dragging', 'last_drag_pos')
def __init__(self):
self.reset()
def reset(self, full=True):
self.last_press_point = None
if full:
self.current_mode = None
self.rect = None
self.in_selection = False
self.drag_corner = None
self.dragging = None
self.last_drag_pos = None
class Command(QUndoCommand):
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:
raise ValueError('No image loaded')
if i.isNull():
raise ValueError('Cannot perform operations on invalid images')
self.after_image = self(canvas)
def undo(self):
canvas = self.canvas_ref()
canvas.set_image(self.before_image)
def redo(self):
canvas = self.canvas_ref()
canvas.set_image(self.after_image)
def get_selection_rect(img, sr, target):
' Given selection rect return the corresponding rectangle in the underlying image as left, top, width, height '
left_border = (abs(sr.left() - target.left())/target.width()) * img.width()
top_border = (abs(sr.top() - target.top())/target.height()) * img.height()
right_border = (abs(target.right() - sr.right())/target.width()) * img.width()
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
class Trim(Command):
''' Remove the areas of the image outside the current selection. '''
TEXT = _('Trim image')
def __call__(self, canvas):
return canvas.current_image.copy(*map(int, canvas.rect_for_trim()))
class AutoTrim(Trim):
''' Auto trim borders from the image '''
TEXT = _('Auto-trim image')
def __call__(self, canvas):
return remove_borders_from_image(canvas.current_image)
class Rotate(Command):
TEXT = _('Rotate image')
def __call__(self, canvas):
img = canvas.current_image
m = QTransform()
m.rotate(90)
return img.transformed(m, Qt.TransformationMode.SmoothTransformation)
class Scale(Command):
TEXT = _('Resize image')
def __init__(self, width, height, canvas):
self.width, self.height = width, height
Command.__init__(self, canvas)
def __call__(self, canvas):
img = canvas.current_image
return img.scaled(self.width, self.height, transformMode=Qt.TransformationMode.SmoothTransformation)
class Sharpen(Command):
TEXT = _('Sharpen image')
FUNC = 'sharpen'
def __init__(self, sigma, canvas):
self.sigma = sigma
Command.__init__(self, canvas)
def __call__(self, canvas):
return gaussian_sharpen_image(canvas.current_image, sigma=self.sigma)
class Blur(Sharpen):
TEXT = _('Blur image')
FUNC = 'blur'
def __call__(self, canvas):
return gaussian_blur_image(canvas.current_image, sigma=self.sigma)
class Oilify(Command):
TEXT = _('Make image look like an oil painting')
def __init__(self, radius, canvas):
self.radius = radius
Command.__init__(self, canvas)
def __call__(self, canvas):
return oil_paint_image(canvas.current_image, radius=self.radius)
class Despeckle(Command):
TEXT = _('De-speckle image')
def __call__(self, canvas):
return despeckle_image(canvas.current_image)
class Normalize(Command):
TEXT = _('Normalize image')
def __call__(self, canvas):
return normalize_image(canvas.current_image)
class Replace(Command):
''' Replace the current image with another image. If there is a selection,
only the region of the selection is replaced. '''
def __init__(self, img, text, canvas):
self.after_image = img
self.TEXT = text
Command.__init__(self, canvas)
def __call__(self, canvas):
if canvas.has_selection and canvas.selection_state.rect is not None:
pimg = self.after_image
img = self.after_image = QImage(canvas.current_image)
rect = QRectF(*get_selection_rect(img, canvas.selection_state.rect, canvas.target))
p = QPainter(img)
p.setRenderHint(QPainter.RenderHint.SmoothPixmapTransform, True)
p.drawImage(rect, pimg, QRectF(pimg.rect()))
p.end()
return self.after_image
def imageop(func):
@wraps(func)
def ans(self, *args, **kwargs):
if self.original_image_data is None:
return error_dialog(self, _('No image'), _('No image loaded'), show=True)
if not self.is_valid:
return error_dialog(self, _('Invalid image'), _('The current image is not valid'), show=True)
QApplication.setOverrideCursor(Qt.CursorShape.BusyCursor)
try:
return func(self, *args, **kwargs)
finally:
QApplication.restoreOverrideCursor()
return ans
class Canvas(QWidget):
BACKGROUND = QColor(60, 60, 60)
SHADE_COLOR = QColor(0, 0, 0, 180)
SELECT_PEN = QPen(QColor(Qt.GlobalColor.white))
selection_state_changed = pyqtSignal(object)
selection_area_changed = pyqtSignal(object)
undo_redo_state_changed = pyqtSignal(object, object)
image_changed = pyqtSignal(object)
@property
def has_selection(self):
return self.selection_state.current_mode == 'selected'
@property
def is_modified(self):
return self.current_image is not self.original_image
# Drag 'n drop {{{
def dragEnterEvent(self, event):
md = event.mimeData()
if dnd_has_extension(md, image_extensions()) or dnd_has_image(md):
event.acceptProposedAction()
def dropEvent(self, event):
event.setDropAction(Qt.DropAction.CopyAction)
md = event.mimeData()
x, y = dnd_get_image(md)
if x is not None:
# We have an image, set cover
event.accept()
if y is None:
# Local image
self.undo_stack.push(Replace(x.toImage(), _('Drop image'), self))
else:
d = DownloadDialog(x, y, self.gui)
d.start_download()
if d.err is None:
with open(d.fpath, 'rb') as f:
img = QImage()
img.loadFromData(f.read())
if not img.isNull():
self.undo_stack.push(Replace(img, _('Drop image'), self))
event.accept()
def dragMoveEvent(self, event):
event.acceptProposedAction()
# }}}
def __init__(self, parent=None):
QWidget.__init__(self, parent)
self.setAcceptDrops(True)
self.setMouseTracking(True)
self.setFocusPolicy(Qt.FocusPolicy.ClickFocus)
self.selection_state = SelectionState()
self.undo_stack = u = QUndoStack()
u.setUndoLimit(10)
u.canUndoChanged.connect(self.emit_undo_redo_state)
u.canRedoChanged.connect(self.emit_undo_redo_state)
self.original_image_data = None
self.is_valid = False
self.original_image_format = None
self.current_image = None
self.current_scaled_pixmap = None
self.last_canvas_size = None
self.target = QRectF(0, 0, 0, 0)
self.undo_action = a = self.undo_stack.createUndoAction(self, _('Undo') + ' ')
a.setIcon(QIcon(I('edit-undo.png')))
self.redo_action = a = self.undo_stack.createRedoAction(self, _('Redo') + ' ')
a.setIcon(QIcon(I('edit-redo.png')))
def load_image(self, data):
self.is_valid = False
try:
fmt = identify(data)[0].encode('ascii')
except Exception:
fmt = b''
self.original_image_format = fmt.decode('ascii').lower()
self.selection_state.reset()
self.original_image_data = data
self.current_image = i = self.original_image = (
QImage.fromData(data, format=fmt) if fmt else QImage.fromData(data))
self.is_valid = not i.isNull()
self.current_scaled_pixmap = None
self.update()
self.image_changed.emit(self.current_image)
def set_image(self, qimage):
self.selection_state.reset()
self.current_scaled_pixmap = None
self.current_image = qimage
self.is_valid = not qimage.isNull()
self.update()
self.image_changed.emit(self.current_image)
def get_image_data(self, quality=90):
if not self.is_modified:
return self.original_image_data
fmt = self.original_image_format or 'JPEG'
if fmt.lower() not in {x.data().decode('utf-8') for x in QImageWriter.supportedImageFormats()}:
if fmt.lower() == 'gif':
data = image_to_data(self.current_image, fmt='PNG', png_compression_level=0)
from PIL import Image
i = Image.open(BytesIO(data))
buf = BytesIO()
i.save(buf, 'gif')
return buf.getvalue()
else:
raise ValueError('Cannot save %s format images' % fmt)
return pixmap_to_data(self.current_image, format=fmt, quality=90)
def copy(self):
if not self.is_valid:
return
clipboard = QApplication.clipboard()
if not self.has_selection or self.selection_state.rect is None:
clipboard.setImage(self.current_image)
else:
trim = Trim(self)
clipboard.setImage(trim.after_image)
trim.before_image = trim.after_image = None
def paste(self):
clipboard = QApplication.clipboard()
md = clipboard.mimeData()
if md.hasImage():
img = QImage(md.imageData())
if not img.isNull():
self.undo_stack.push(Replace(img, _('Paste image'), self))
else:
error_dialog(self, _('No image'), _(
'No image available in the clipboard'), show=True)
def break_cycles(self):
self.undo_stack.clear()
self.original_image_data = self.current_image = self.current_scaled_pixmap = None
def emit_undo_redo_state(self):
self.undo_redo_state_changed.emit(self.undo_action.isEnabled(), self.redo_action.isEnabled())
@imageop
def trim_image(self):
if self.selection_state.rect is None:
error_dialog(self, _('No selection'), _(
'No active selection, first select a region in the image, by dragging with your mouse'), show=True)
return False
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))
return True
@imageop
def resize_image(self, width, height):
self.undo_stack.push(Scale(width, height, self))
return True
@imageop
def sharpen_image(self, sigma=3.0):
self.undo_stack.push(Sharpen(sigma, self))
return True
@imageop
def blur_image(self, sigma=3.0):
self.undo_stack.push(Blur(sigma, self))
return True
@imageop
def despeckle_image(self):
self.undo_stack.push(Despeckle(self))
return True
@imageop
def normalize_image(self):
self.undo_stack.push(Normalize(self))
return True
@imageop
def oilify_image(self, radius=4.0):
self.undo_stack.push(Oilify(radius, self))
return True
# The selection rectangle {{{
@property
def dc_size(self):
sr = self.selection_state.rect
dx = min(75, sr.width() / 4)
dy = min(75, sr.height() / 4)
return dx, dy
def get_drag_corner(self, pos):
dx, dy = self.dc_size
sr = self.selection_state.rect
x, y = pos.x(), pos.y()
hedge = 'left' if x < sr.x() + dx else 'right' if x > sr.right() - dx else None
vedge = 'top' if y < sr.y() + dy else 'bottom' if y > sr.bottom() - dy else None
return (hedge, vedge) if hedge or vedge else None
def get_drag_rect(self):
sr = self.selection_state.rect
dc = self.selection_state.drag_corner
if None in (sr, dc):
return
dx, dy = self.dc_size
if None in dc:
# An edge
if dc[0] is None:
top = sr.top() if dc[1] == 'top' else sr.bottom() - dy
ans = QRectF(sr.left() + dx, top, sr.width() - 2 * dx, dy)
else:
left = sr.left() if dc[0] == 'left' else sr.right() - dx
ans = QRectF(left, sr.top() + dy, dx, sr.height() - 2 * dy)
else:
# A corner
left = sr.left() if dc[0] == 'left' else sr.right() - dx
top = sr.top() if dc[1] == 'top' else sr.bottom() - dy
ans = QRectF(left, top, dx, dy)
return ans
def get_cursor(self):
dc = self.selection_state.drag_corner
if dc is None:
ans = Qt.CursorShape.OpenHandCursor if self.selection_state.last_drag_pos is None else Qt.CursorShape.ClosedHandCursor
elif None in dc:
ans = Qt.CursorShape.SizeVerCursor if dc[0] is None else Qt.CursorShape.SizeHorCursor
else:
ans = Qt.CursorShape.SizeBDiagCursor if dc in {('left', 'bottom'), ('right', 'top')} else Qt.CursorShape.SizeFDiagCursor
return ans
def update(self):
super().update()
self.selection_area_changed.emit(self.selection_state.rect)
def move_edge(self, edge, dp):
sr = self.selection_state.rect
horiz = edge in {'left', 'right'}
func = getattr(sr, 'set' + capitalize(edge))
delta = getattr(dp, 'x' if horiz else 'y')()
buf = 50
if horiz:
minv = self.target.left() if edge == 'left' else sr.left() + buf
maxv = sr.right() - buf if edge == 'left' else self.target.right()
else:
minv = self.target.top() if edge == 'top' else sr.top() + buf
maxv = sr.bottom() - buf if edge == 'top' else self.target.bottom()
func(max(minv, min(maxv, delta + getattr(sr, edge)())))
def move_selection_rect(self, x, y):
sr = self.selection_state.rect
half_width = sr.width() / 2.0
half_height = sr.height() / 2.0
c = sr.center()
nx = c.x() + x
ny = c.y() + y
minx = self.target.left() + half_width
maxx = self.target.right() - half_width
miny, maxy = self.target.top() + half_height, self.target.bottom() - half_height
nx = max(minx, min(maxx, nx))
ny = max(miny, min(maxy, ny))
sr.moveCenter(QPointF(nx, ny))
def move_selection(self, dp):
dm = self.selection_state.dragging
if dm is None:
self.move_selection_rect(dp.x(), dp.y())
else:
for edge in dm:
if edge is not None:
self.move_edge(edge, dp)
def rect_for_trim(self):
img = self.current_image
target = self.target
sr = self.selection_state.rect
return get_selection_rect(img, sr, target)
def mousePressEvent(self, ev):
if ev.button() == Qt.MouseButton.LeftButton and self.target.contains(ev.pos()):
pos = ev.pos()
self.selection_state.last_press_point = pos
if self.selection_state.current_mode is None:
self.selection_state.current_mode = 'select'
elif self.selection_state.current_mode == 'selected':
if self.selection_state.rect is not None and self.selection_state.rect.contains(pos):
self.selection_state.drag_corner = self.selection_state.dragging = self.get_drag_corner(pos)
self.selection_state.last_drag_pos = pos
self.setCursor(self.get_cursor())
else:
self.selection_state.current_mode = 'select'
self.selection_state.rect = None
self.selection_state_changed.emit(False)
def mouseMoveEvent(self, ev):
changed = False
if self.selection_state.in_selection:
changed = True
self.selection_state.in_selection = False
self.selection_state.drag_corner = None
pos = ev.pos()
cursor = Qt.CursorShape.ArrowCursor
try:
if not self.target.contains(pos):
return
if ev.buttons() & Qt.MouseButton.LeftButton:
if self.selection_state.last_press_point is not None and self.selection_state.current_mode is not None:
if self.selection_state.current_mode == 'select':
self.selection_state.rect = QRectF(self.selection_state.last_press_point, pos).normalized()
changed = True
elif self.selection_state.last_drag_pos is not None:
self.selection_state.in_selection = True
self.selection_state.drag_corner = self.selection_state.dragging
dp = pos - self.selection_state.last_drag_pos
self.selection_state.last_drag_pos = pos
self.move_selection(dp)
cursor = self.get_cursor()
changed = True
else:
if self.selection_state.rect is None or not self.selection_state.rect.contains(pos):
return
if self.selection_state.current_mode == 'selected':
if self.selection_state.rect is not None and self.selection_state.rect.contains(pos):
self.selection_state.drag_corner = self.get_drag_corner(pos)
self.selection_state.in_selection = True
cursor = self.get_cursor()
changed = True
finally:
if changed:
self.update()
self.setCursor(cursor)
def mouseReleaseEvent(self, ev):
if ev.button() == Qt.MouseButton.LeftButton:
self.selection_state.dragging = self.selection_state.last_drag_pos = None
if self.selection_state.current_mode == 'select':
r = self.selection_state.rect
if r is None or max(r.width(), r.height()) < 3:
self.selection_state.reset()
else:
self.selection_state.current_mode = 'selected'
self.selection_state_changed.emit(self.has_selection)
elif self.selection_state.current_mode == 'selected' and self.selection_state.rect is not None and self.selection_state.rect.contains(ev.pos()):
self.setCursor(self.get_cursor())
self.update()
def keyPressEvent(self, ev):
k = ev.key()
if k in (Qt.Key.Key_Left, Qt.Key.Key_Right, Qt.Key.Key_Up, Qt.Key.Key_Down) and self.selection_state.rect is not None and self.has_selection:
ev.accept()
delta = 10 if ev.modifiers() & Qt.KeyboardModifier.ShiftModifier else 1
x = y = 0
if k in (Qt.Key.Key_Left, Qt.Key.Key_Right):
x = delta * (-1 if k == Qt.Key.Key_Left else 1)
else:
y = delta * (-1 if k == Qt.Key.Key_Up else 1)
self.move_selection_rect(x, y)
self.update()
else:
return QWidget.keyPressEvent(self, ev)
# }}}
# Painting {{{
@painter
def draw_background(self, painter):
painter.fillRect(self.rect(), self.BACKGROUND)
@painter
def draw_image_error(self, painter):
font = painter.font()
font.setPointSize(3 * font.pointSize())
font.setBold(True)
painter.setFont(font)
painter.setPen(QColor(Qt.GlobalColor.black))
painter.drawText(self.rect(), Qt.AlignmentFlag.AlignCenter, _('Not a valid image'))
def load_pixmap(self):
canvas_size = self.rect().width(), self.rect().height()
if self.last_canvas_size != canvas_size:
if self.last_canvas_size is not None and self.selection_state.rect is not None:
self.selection_state.reset()
# TODO: Migrate the selection rect
self.last_canvas_size = canvas_size
self.current_scaled_pixmap = None
if self.current_scaled_pixmap is None:
pwidth, pheight = self.last_canvas_size
i = self.current_image
width, height = i.width(), i.height()
scaled, width, height = fit_image(width, height, pwidth, pheight)
try:
dpr = self.devicePixelRatioF()
except AttributeError:
dpr = self.devicePixelRatio()
if scaled:
i = self.current_image.scaled(int(dpr * width), int(dpr * height), transformMode=Qt.TransformationMode.SmoothTransformation)
self.current_scaled_pixmap = QPixmap.fromImage(i)
self.current_scaled_pixmap.setDevicePixelRatio(dpr)
@painter
def draw_pixmap(self, painter):
p = self.current_scaled_pixmap
try:
dpr = self.devicePixelRatioF()
except AttributeError:
dpr = self.devicePixelRatio()
width, height = int(p.width()/dpr), int(p.height()/dpr)
pwidth, pheight = self.last_canvas_size
x = int(abs(pwidth - width)/2.)
y = int(abs(pheight - height)/2.)
self.target = QRectF(x, y, width, height)
painter.drawPixmap(self.target, p, QRectF(p.rect()))
@painter
def draw_selection_rect(self, painter):
cr, sr = self.target, self.selection_state.rect
painter.setPen(self.SELECT_PEN)
painter.setRenderHint(QPainter.RenderHint.Antialiasing, False)
if self.selection_state.current_mode == 'selected':
# Shade out areas outside the selection rect
for r in (
QRectF(cr.topLeft(), QPointF(sr.left(), cr.bottom())), # left
QRectF(QPointF(sr.left(), cr.top()), sr.topRight()), # top
QRectF(QPointF(sr.right(), cr.top()), cr.bottomRight()), # right
QRectF(sr.bottomLeft(), QPointF(sr.right(), cr.bottom())), # bottom
):
painter.fillRect(r, self.SHADE_COLOR)
dr = self.get_drag_rect()
if self.selection_state.in_selection and dr is not None:
# Draw the resize rectangle
painter.save()
painter.setCompositionMode(QPainter.CompositionMode.RasterOp_SourceAndNotDestination)
painter.setClipRect(sr.adjusted(1, 1, -1, -1))
painter.drawRect(dr)
painter.restore()
# Draw the selection rectangle
painter.setCompositionMode(QPainter.CompositionMode.RasterOp_SourceAndNotDestination)
painter.drawRect(sr)
def paintEvent(self, event):
QWidget.paintEvent(self, event)
p = QPainter(self)
p.setRenderHints(QPainter.RenderHint.Antialiasing | QPainter.RenderHint.SmoothPixmapTransform)
try:
self.draw_background(p)
if self.original_image_data is None:
return
if not self.is_valid:
return self.draw_image_error(p)
self.load_pixmap()
self.draw_pixmap(p)
if self.selection_state.rect is not None:
self.draw_selection_rect(p)
finally:
p.end()
# }}}
if __name__ == '__main__':
app = QApplication([])
with open(sys.argv[-1], 'rb') as f:
data = f.read()
c = Canvas()
c.load_image(data)
c.show()
app.exec()
Zerion Mini Shell 1.0