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draw.py
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draw.py
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"""Take an "after layout" box tree and draw it onto a pydyf stream."""
import contextlib
import operator
from colorsys import hsv_to_rgb, rgb_to_hsv
from io import BytesIO
from math import ceil, cos, floor, pi, sin, sqrt, tan
from xml.etree import ElementTree
from PIL import Image
from .formatting_structure import boxes
from .images import RasterImage, SVGImage
from .layout import replaced
from .layout.background import BackgroundLayer
from .matrix import Matrix
from .stacking import StackingContext
from .text.ffi import ffi, harfbuzz, pango, units_from_double, units_to_double
from .text.line_break import get_last_word_end
SIDES = ('top', 'right', 'bottom', 'left')
@contextlib.contextmanager
def stacked(stream):
"""Save and restore stream context when used with the ``with`` keyword."""
stream.push_state()
try:
yield
finally:
stream.pop_state()
def get_color(style, key):
value = style[key]
return value if value != 'currentColor' else style['color']
def darken(color):
"""Return a darker color."""
hue, saturation, value = rgb_to_hsv(color.red, color.green, color.blue)
value /= 1.5
saturation /= 1.25
return hsv_to_rgb(hue, saturation, value) + (color.alpha,)
def lighten(color):
"""Return a lighter color."""
hue, saturation, value = rgb_to_hsv(color.red, color.green, color.blue)
value = 1 - (1 - value) / 1.5
if saturation:
saturation = 1 - (1 - saturation) / 1.25
return hsv_to_rgb(hue, saturation, value) + (color.alpha,)
def draw_page(page, stream):
"""Draw the given PageBox."""
bleed = {
side: page.style[f'bleed_{side}'].value
for side in ('top', 'right', 'bottom', 'left')}
marks = page.style['marks']
stacking_context = StackingContext.from_page(page)
draw_background(
stream, stacking_context.box.background, clip_box=False, bleed=bleed,
marks=marks)
draw_background(stream, page.canvas_background, clip_box=False)
draw_border(stream, page)
draw_stacking_context(stream, stacking_context)
def draw_box_background_and_border(stream, page, box):
if isinstance(box, boxes.TableBox):
draw_table(stream, box)
else:
draw_background(stream, box.background)
draw_border(stream, box)
def draw_stacking_context(stream, stacking_context):
"""Draw a ``stacking_context`` on ``stream``."""
# See https://www.w3.org/TR/CSS2/zindex.html
with stacked(stream):
box = stacking_context.box
stream.begin_marked_content(box, mcid=True)
# apply the viewport_overflow to the html box, see #35
if box.is_for_root_element and (
stacking_context.page.style['overflow'] != 'visible'):
rounded_box_path(
stream, stacking_context.page.rounded_padding_box())
stream.clip()
stream.end()
if box.is_absolutely_positioned() and box.style['clip']:
top, right, bottom, left = box.style['clip']
if top == 'auto':
top = 0
if right == 'auto':
right = 0
if bottom == 'auto':
bottom = box.border_height()
if left == 'auto':
left = box.border_width()
stream.rectangle(
box.border_box_x() + right, box.border_box_y() + top,
left - right, bottom - top)
stream.clip()
stream.end()
if box.style['opacity'] < 1:
original_stream = stream
stream = stream.add_group(stream.page_rectangle)
if box.transformation_matrix:
if box.transformation_matrix.determinant:
stream.transform(*box.transformation_matrix.values)
else:
stream.end_marked_content()
return
# Point 1 is done in draw_page
# Point 2
if isinstance(box, (boxes.BlockBox, boxes.MarginBox,
boxes.InlineBlockBox, boxes.TableCellBox,
boxes.FlexContainerBox)):
# The canvas background was removed by layout_backgrounds
draw_box_background_and_border(stream, stacking_context.page, box)
with stacked(stream):
# dont clip the PageBox, see #35
if box.style['overflow'] != 'visible' and not isinstance(
box, boxes.PageBox):
# Only clip the content and the children:
# - the background is already clipped
# - the border must *not* be clipped
rounded_box_path(stream, box.rounded_padding_box())
stream.clip()
stream.end()
# Point 3
for child_context in stacking_context.negative_z_contexts:
draw_stacking_context(stream, child_context)
# Point 4
for block in stacking_context.block_level_boxes:
draw_box_background_and_border(
stream, stacking_context.page, block)
# Point 5
for child_context in stacking_context.float_contexts:
draw_stacking_context(stream, child_context)
# Point 6
if isinstance(box, boxes.InlineBox):
draw_inline_level(stream, stacking_context.page, box)
# Point 7
for block in [box] + stacking_context.blocks_and_cells:
if isinstance(block, boxes.ReplacedBox):
draw_border(stream, block)
draw_replacedbox(stream, block)
elif block.children:
if block != box:
stream.begin_marked_content(block, mcid=True)
if isinstance(block.children[-1], boxes.LineBox):
for child in block.children:
draw_inline_level(
stream, stacking_context.page, child)
if block != box:
stream.end_marked_content()
# Point 8
for child_context in stacking_context.zero_z_contexts:
draw_stacking_context(stream, child_context)
# Point 9
for child_context in stacking_context.positive_z_contexts:
draw_stacking_context(stream, child_context)
# Point 10
draw_outlines(stream, box)
if box.style['opacity'] < 1:
group_id = stream.id
stream = original_stream
stream.push_state()
stream.set_alpha(box.style['opacity'], stroke=True, fill=True)
stream.draw_x_object(group_id)
stream.pop_state()
stream.end_marked_content()
def rounded_box_path(stream, radii):
"""Draw the path of the border radius box.
``widths`` is a tuple of the inner widths (top, right, bottom, left) from
the border box. Radii are adjusted from these values. Default is (0, 0, 0,
0).
"""
x, y, w, h, tl, tr, br, bl = radii
if all(0 in corner for corner in (tl, tr, br, bl)):
# No radius, draw a rectangle
stream.rectangle(x, y, w, h)
return
r = 0.45
stream.move_to(x + tl[0], y)
stream.line_to(x + w - tr[0], y)
stream.curve_to(
x + w - tr[0] * r, y, x + w, y + tr[1] * r, x + w, y + tr[1])
stream.line_to(x + w, y + h - br[1])
stream.curve_to(
x + w, y + h - br[1] * r, x + w - br[0] * r, y + h, x + w - br[0],
y + h)
stream.line_to(x + bl[0], y + h)
stream.curve_to(
x + bl[0] * r, y + h, x, y + h - bl[1] * r, x, y + h - bl[1])
stream.line_to(x, y + tl[1])
stream.curve_to(
x, y + tl[1] * r, x + tl[0] * r, y, x + tl[0], y)
def draw_background(stream, bg, clip_box=True, bleed=None, marks=()):
"""Draw the background color and image to a ``document.Stream``.
If ``clip_box`` is set to ``False``, the background is not clipped to the
border box of the background, but only to the painting area.
"""
if bg is None:
return
with stacked(stream):
if clip_box:
for box in bg.layers[-1].clipped_boxes:
rounded_box_path(stream, box)
stream.clip()
stream.end()
# Background color
if bg.color.alpha > 0:
with stacked(stream):
stream.set_color_rgb(*bg.color[:3])
stream.set_alpha(bg.color.alpha)
painting_area = bg.layers[-1].painting_area
if painting_area:
if bleed:
# Painting area is the PDF BleedBox
x, y, width, height = painting_area
painting_area = (
x - bleed['left'], y - bleed['top'],
width + bleed['left'] + bleed['right'],
height + bleed['top'] + bleed['bottom'])
stream.rectangle(*painting_area)
stream.clip()
stream.end()
stream.rectangle(*stream.page_rectangle)
stream.fill()
if bleed and marks:
x, y, width, height = bg.layers[-1].painting_area
x -= bleed['left']
y -= bleed['top']
width += bleed['left'] + bleed['right']
height += bleed['top'] + bleed['bottom']
half_bleed = {key: value * 0.5 for key, value in bleed.items()}
svg = f'''
<svg height="{height}" width="{width}"
fill="transparent" stroke="black" stroke-width="1"
xmlns="https://www.w3.org/2000/svg">
'''
if 'crop' in marks:
svg += f'''
<path d="M0,{bleed['top']} h{half_bleed['left']}" />
<path d="M0,{bleed['top']} h{half_bleed['right']}"
transform="translate({width},0) scale(-1,1)" />
<path d="M0,{bleed['bottom']} h{half_bleed['right']}"
transform="translate({width},{height}) scale(-1,-1)" />
<path d="M0,{bleed['bottom']} h{half_bleed['left']}"
transform="translate(0,{height}) scale(1,-1)" />
<path d="M{bleed['left']},0 v{half_bleed['top']}" />
<path d="M{bleed['right']},0 v{half_bleed['bottom']}"
transform="translate({width},{height}) scale(-1,-1)" />
<path d="M{bleed['left']},0 v{half_bleed['bottom']}"
transform="translate(0,{height}) scale(1,-1)" />
<path d="M{bleed['right']},0 v{half_bleed['top']}"
transform="translate({width},0) scale(-1,1)" />
'''
if 'cross' in marks:
svg += f'''
<circle r="{half_bleed['top']}" transform="scale(0.5)
translate({width},{half_bleed['top']}) scale(0.5)" />
<path transform="scale(0.5) translate({width},0)" d="
M-{half_bleed['top']},{half_bleed['top']} h{bleed['top']}
M0,0 v{bleed['top']}" />
<circle r="{half_bleed['bottom']}" transform="
translate(0,{height}) scale(0.5)
translate({width},-{half_bleed['bottom']}) scale(0.5)" />
<path d="M-{half_bleed['bottom']},-{half_bleed['bottom']}
h{bleed['bottom']} M0,0 v-{bleed['bottom']}" transform="
translate(0,{height}) scale(0.5) translate({width},0)" />
<circle r="{half_bleed['left']}" transform="scale(0.5)
translate({half_bleed['left']},{height}) scale(0.5)" />
<path d="M{half_bleed['left']},-{half_bleed['left']}
v{bleed['left']} M0,0 h{bleed['left']}"
transform="scale(0.5) translate(0,{height})" />
<circle r="{half_bleed['right']}" transform="
translate({width},0) scale(0.5)
translate(-{half_bleed['right']},{height}) scale(0.5)" />
<path d="M-{half_bleed['right']},-{half_bleed['right']}
v{bleed['right']} M0,0 h-{bleed['right']}" transform="
translate({width},0) scale(0.5) translate(0,{height})" />
'''
svg += '</svg>'
tree = ElementTree.fromstring(svg)
image = SVGImage(tree, None, None, stream)
# Painting area is the PDF media box
size = (width, height)
position = (x, y)
repeat = ('no-repeat', 'no-repeat')
unbounded = True
painting_area = position + size
positioning_area = (0, 0, width, height)
clipped_boxes = []
layer = BackgroundLayer(
image, size, position, repeat, unbounded, painting_area,
positioning_area, clipped_boxes)
bg.layers.insert(0, layer)
# Paint in reversed order: first layer is "closest" to the viewer.
for layer in reversed(bg.layers):
draw_background_image(stream, layer, bg.image_rendering)
def draw_background_image(stream, layer, image_rendering):
if layer.image is None or 0 in layer.size:
return
painting_x, painting_y, painting_width, painting_height = (
layer.painting_area)
positioning_x, positioning_y, positioning_width, positioning_height = (
layer.positioning_area)
position_x, position_y = layer.position
repeat_x, repeat_y = layer.repeat
image_width, image_height = layer.size
if repeat_x == 'no-repeat':
# We want at least the whole image_width drawn on sub_surface, but we
# want to be sure it will not be repeated on the painting_width. We
# double the painting width to ensure viewers don't incorrectly bleed
# the edge of the pattern into the painting area. (See #1539.)
repeat_width = max(image_width, 2 * painting_width)
elif repeat_x in ('repeat', 'round'):
# We repeat the image each image_width.
repeat_width = image_width
else:
assert repeat_x == 'space'
n_repeats = floor(positioning_width / image_width)
if n_repeats >= 2:
# The repeat width is the whole positioning width with one image
# removed, divided by (the number of repeated images - 1). This
# way, we get the width of one image + one space. We ignore
# background-position for this dimension.
repeat_width = (positioning_width - image_width) / (n_repeats - 1)
position_x = 0
else:
# We don't repeat the image.
repeat_width = positioning_width
# Comments above apply here too.
if repeat_y == 'no-repeat':
repeat_height = max(image_height, 2 * painting_height)
elif repeat_y in ('repeat', 'round'):
repeat_height = image_height
else:
assert repeat_y == 'space'
n_repeats = floor(positioning_height / image_height)
if n_repeats >= 2:
repeat_height = (
positioning_height - image_height) / (n_repeats - 1)
position_y = 0
else:
repeat_height = positioning_height
matrix = Matrix(e=position_x + positioning_x, f=position_y + positioning_y)
matrix @= stream.ctm
pattern = stream.add_pattern(
image_width, image_height, repeat_width, repeat_height, matrix)
group = pattern.add_group([0, 0, repeat_width, repeat_height])
with stacked(stream):
layer.image.draw(group, image_width, image_height, image_rendering)
pattern.draw_x_object(group.id)
stream.color_space('Pattern')
stream.set_color_special(pattern.id)
if layer.unbounded:
x1, y1, x2, y2 = stream.page_rectangle
stream.rectangle(x1, y1, x2 - x1, y2 - y1)
else:
stream.rectangle(
painting_x, painting_y, painting_width, painting_height)
stream.fill()
def styled_color(style, color, side):
if style in ('inset', 'outset'):
do_lighten = (side in ('top', 'left')) ^ (style == 'inset')
return (lighten if do_lighten else darken)(color)
elif style in ('ridge', 'groove'):
if (side in ('top', 'left')) ^ (style == 'ridge'):
return lighten(color), darken(color)
else:
return darken(color), lighten(color)
return color
def draw_border(stream, box):
"""Draw the box border to a ``document.Stream``."""
# We need a plan to draw beautiful borders, and that's difficult, no need
# to lie. Let's try to find the cases that we can handle in a smart way.
def get_columns_with_rule():
"""Yield columns that have a rule drawn on the left."""
skip_next = True
for child in box.children:
if child.style['column_span'] == 'all':
skip_next = True
elif skip_next:
skip_next = False
else:
yield child
def draw_column_border():
"""Draw column borders."""
columns = (
isinstance(box, boxes.BlockContainerBox) and (
box.style['column_width'] != 'auto' or
box.style['column_count'] != 'auto'))
if columns and box.style['column_rule_width']:
border_widths = (0, 0, 0, box.style['column_rule_width'])
for child in get_columns_with_rule():
with stacked(stream):
position_x = (child.position_x - (
box.style['column_rule_width'] +
box.style['column_gap']) / 2)
border_box = (
position_x, child.position_y,
box.style['column_rule_width'], child.height)
clip_border_segment(
stream, box.style['column_rule_style'],
box.style['column_rule_width'], 'left', border_box,
border_widths)
draw_rect_border(
stream, border_box, border_widths,
box.style['column_rule_style'], styled_color(
box.style['column_rule_style'],
get_color(box.style, 'column_rule_color'), 'left'))
# The box is hidden, easy.
if box.style['visibility'] != 'visible':
draw_column_border()
return
widths = [getattr(box, f'border_{side}_width') for side in SIDES]
# No border, return early.
if all(width == 0 for width in widths):
draw_column_border()
return
colors = [get_color(box.style, f'border_{side}_color') for side in SIDES]
styles = [
colors[i].alpha and box.style[f'border_{side}_style']
for (i, side) in enumerate(SIDES)]
# The 4 sides are solid or double, and they have the same color. Oh yeah!
# We can draw them so easily!
if set(styles) in (set(('solid',)), set(('double',))) and (
len(set(colors)) == 1):
draw_rounded_border(stream, box, styles[0], colors[0])
draw_column_border()
return
# We're not smart enough to find a good way to draw the borders :/. We must
# draw them side by side.
for side, width, color, style in zip(SIDES, widths, colors, styles):
if width == 0 or not color:
continue
with stacked(stream):
clip_border_segment(
stream, style, width, side, box.rounded_border_box()[:4],
widths, box.rounded_border_box()[4:])
draw_rounded_border(
stream, box, style, styled_color(style, color, side))
draw_column_border()
def clip_border_segment(stream, style, width, side, border_box,
border_widths=None, radii=None):
"""Clip one segment of box border.
The strategy is to remove the zones not needed because of the style or the
side before painting.
"""
bbx, bby, bbw, bbh = border_box
(tlh, tlv), (trh, trv), (brh, brv), (blh, blv) = radii or 4 * ((0, 0),)
bt, br, bb, bl = border_widths or 4 * (width,)
def transition_point(x1, y1, x2, y2):
"""Get the point use for border transition.
The extra boolean returned is ``True`` if the point is in the padding
box (ie. the padding box is rounded).
This point is not specified. We must be sure to be inside the rounded
padding box, and in the zone defined in the "transition zone" allowed
by the specification. We chose the corner of the transition zone. It's
easy to get and gives quite good results, but it seems to be different
from what other browsers do.
"""
return (
((x1, y1), True) if abs(x1) > abs(x2) and abs(y1) > abs(y2)
else ((x2, y2), False))
def corner_half_length(a, b):
"""Return the length of the half of one ellipsis corner.
Inspired by [Ramanujan, S., "Modular Equations and Approximations to
pi" Quart. J. Pure. Appl. Math., vol. 45 (1913-1914), pp. 350-372],
wonderfully explained by Dr Rob.
https://mathforum.org/dr.math/faq/formulas/
"""
x = (a - b) / (a + b)
return pi / 8 * (a + b) * (
1 + 3 * x ** 2 / (10 + sqrt(4 - 3 * x ** 2)))
if side == 'top':
(px1, py1), rounded1 = transition_point(tlh, tlv, bl, bt)
(px2, py2), rounded2 = transition_point(-trh, trv, -br, bt)
width = bt
way = 1
angle = 1
main_offset = bby
elif side == 'right':
(px1, py1), rounded1 = transition_point(-trh, trv, -br, bt)
(px2, py2), rounded2 = transition_point(-brh, -brv, -br, -bb)
width = br
way = 1
angle = 2
main_offset = bbx + bbw
elif side == 'bottom':
(px1, py1), rounded1 = transition_point(blh, -blv, bl, -bb)
(px2, py2), rounded2 = transition_point(-brh, -brv, -br, -bb)
width = bb
way = -1
angle = 3
main_offset = bby + bbh
elif side == 'left':
(px1, py1), rounded1 = transition_point(tlh, tlv, bl, bt)
(px2, py2), rounded2 = transition_point(blh, -blv, bl, -bb)
width = bl
way = -1
angle = 4
main_offset = bbx
if side in ('top', 'bottom'):
a1, b1 = px1 - bl / 2, way * py1 - width / 2
a2, b2 = -px2 - br / 2, way * py2 - width / 2
line_length = bbw - px1 + px2
length = bbw
stream.move_to(bbx + bbw, main_offset)
stream.line_to(bbx, main_offset)
stream.line_to(bbx + px1, main_offset + py1)
stream.line_to(bbx + bbw + px2, main_offset + py2)
elif side in ('left', 'right'):
a1, b1 = -way * px1 - width / 2, py1 - bt / 2
a2, b2 = -way * px2 - width / 2, -py2 - bb / 2
line_length = bbh - py1 + py2
length = bbh
stream.move_to(main_offset, bby + bbh)
stream.line_to(main_offset, bby)
stream.line_to(main_offset + px1, bby + py1)
stream.line_to(main_offset + px2, bby + bbh + py2)
if style in ('dotted', 'dashed'):
dash = width if style == 'dotted' else 3 * width
if rounded1 or rounded2:
# At least one of the two corners is rounded
chl1 = corner_half_length(a1, b1)
chl2 = corner_half_length(a2, b2)
length = line_length + chl1 + chl2
dash_length = round(length / dash)
if rounded1 and rounded2:
# 2x dashes
dash = length / (dash_length + dash_length % 2)
else:
# 2x - 1/2 dashes
dash = length / (dash_length + dash_length % 2 - 0.5)
dashes1 = int(ceil((chl1 - dash / 2) / dash))
dashes2 = int(ceil((chl2 - dash / 2) / dash))
line = int(floor(line_length / dash))
def draw_dots(dashes, line, way, x, y, px, py, chl):
if not dashes:
return line + 1, 0
for i in range(0, dashes, 2):
i += 0.5 # half dash
angle1 = (
((2 * angle - way) + i * way * dash / chl) /
4 * pi)
angle2 = (min if way > 0 else max)(
((2 * angle - way) + (i + 1) * way * dash / chl) /
4 * pi,
angle * pi / 2)
if side in ('top', 'bottom'):
stream.move_to(x + px, main_offset + py)
stream.line_to(
x + px - way * px * 1 / tan(angle2), main_offset)
stream.line_to(
x + px - way * px * 1 / tan(angle1), main_offset)
elif side in ('left', 'right'):
stream.move_to(main_offset + px, y + py)
stream.line_to(
main_offset, y + py + way * py * tan(angle2))
stream.line_to(
main_offset, y + py + way * py * tan(angle1))
if angle2 == angle * pi / 2:
offset = (angle1 - angle2) / ((
((2 * angle - way) + (i + 1) * way * dash / chl) /
4 * pi) - angle1)
line += 1
break
else:
offset = 1 - (
(angle * pi / 2 - angle2) / (angle2 - angle1))
return line, offset
line, offset = draw_dots(
dashes1, line, way, bbx, bby, px1, py1, chl1)
line = draw_dots(
dashes2, line, -way, bbx + bbw, bby + bbh, px2, py2, chl2)[0]
if line_length > 1e-6:
for i in range(0, line, 2):
i += offset
if side in ('top', 'bottom'):
x1 = max(bbx + px1 + i * dash, bbx + px1)
x2 = min(bbx + px1 + (i + 1) * dash, bbx + bbw + px2)
y1 = main_offset - (width if way < 0 else 0)
y2 = y1 + width
elif side in ('left', 'right'):
y1 = max(bby + py1 + i * dash, bby + py1)
y2 = min(bby + py1 + (i + 1) * dash, bby + bbh + py2)
x1 = main_offset - (width if way > 0 else 0)
x2 = x1 + width
stream.rectangle(x1, y1, x2 - x1, y2 - y1)
else:
# 2x + 1 dashes
stream.clip(even_odd=True)
stream.end()
dash = length / (
round(length / dash) - (round(length / dash) + 1) % 2) or 1
for i in range(0, int(round(length / dash)), 2):
if side == 'top':
stream.rectangle(bbx + i * dash, bby, dash, width)
elif side == 'right':
stream.rectangle(
bbx + bbw - width, bby + i * dash, width, dash)
elif side == 'bottom':
stream.rectangle(
bbx + i * dash, bby + bbh - width, dash, width)
elif side == 'left':
stream.rectangle(bbx, bby + i * dash, width, dash)
stream.clip(even_odd=True)
stream.end()
def draw_rounded_border(stream, box, style, color):
if style in ('ridge', 'groove'):
stream.set_color_rgb(*color[0][:3])
stream.set_alpha(color[0][3])
rounded_box_path(stream, box.rounded_padding_box())
rounded_box_path(stream, box.rounded_box_ratio(1 / 2))
stream.fill(even_odd=True)
stream.set_color_rgb(*color[1][:3])
stream.set_alpha(color[1][3])
rounded_box_path(stream, box.rounded_box_ratio(1 / 2))
rounded_box_path(stream, box.rounded_border_box())
stream.fill(even_odd=True)
return
stream.set_color_rgb(*color[:3])
stream.set_alpha(color[3])
rounded_box_path(stream, box.rounded_padding_box())
if style == 'double':
rounded_box_path(stream, box.rounded_box_ratio(1 / 3))
rounded_box_path(stream, box.rounded_box_ratio(2 / 3))
rounded_box_path(stream, box.rounded_border_box())
stream.fill(even_odd=True)
def draw_rect_border(stream, box, widths, style, color):
bbx, bby, bbw, bbh = box
bt, br, bb, bl = widths
if style in ('ridge', 'groove'):
stream.set_color_rgb(*color[0][:3])
stream.set_alpha(color[0][3])
stream.rectangle(*box)
stream.rectangle(
bbx + bl / 2, bby + bt / 2,
bbw - (bl + br) / 2, bbh - (bt + bb) / 2)
stream.fill(even_odd=True)
stream.rectangle(
bbx + bl / 2, bby + bt / 2,
bbw - (bl + br) / 2, bbh - (bt + bb) / 2)
stream.rectangle(bbx + bl, bby + bt, bbw - bl - br, bbh - bt - bb)
stream.set_color_rgb(*color[1][:3])
stream.set_alpha(color[1][3])
stream.fill(even_odd=True)
return
stream.set_color_rgb(*color[:3])
stream.set_alpha(color[3])
stream.rectangle(*box)
if style == 'double':
stream.rectangle(
bbx + bl / 3, bby + bt / 3,
bbw - (bl + br) / 3, bbh - (bt + bb) / 3)
stream.rectangle(
bbx + bl * 2 / 3, bby + bt * 2 / 3,
bbw - (bl + br) * 2 / 3, bbh - (bt + bb) * 2 / 3)
stream.rectangle(bbx + bl, bby + bt, bbw - bl - br, bbh - bt - bb)
stream.fill(even_odd=True)
def draw_outlines(stream, box):
width = box.style['outline_width']
color = get_color(box.style, 'outline_color')
style = box.style['outline_style']
if box.style['visibility'] == 'visible' and width and color.alpha:
outline_box = (
box.border_box_x() - width, box.border_box_y() - width,
box.border_width() + 2 * width, box.border_height() + 2 * width)
for side in SIDES:
with stacked(stream):
clip_border_segment(stream, style, width, side, outline_box)
draw_rect_border(
stream, outline_box, 4 * (width,), style,
styled_color(style, color, side))
if isinstance(box, boxes.ParentBox):
for child in box.children:
if isinstance(child, boxes.Box):
draw_outlines(stream, child)
def draw_table(stream, table):
# Draw backgrounds
draw_background(stream, table.background)
for column_group in table.column_groups:
draw_background(stream, column_group.background)
for column in column_group.children:
draw_background(stream, column.background)
for row_group in table.children:
draw_background(stream, row_group.background)
for row in row_group.children:
draw_background(stream, row.background)
for cell in row.children:
if (table.style['border_collapse'] == 'collapse' or
cell.style['empty_cells'] == 'show' or
not cell.empty):
draw_background(stream, cell.background)
# Draw borders
if table.style['border_collapse'] == 'collapse':
return draw_collapsed_borders(stream, table)
draw_border(stream, table)
for row_group in table.children:
for row in row_group.children:
for cell in row.children:
if cell.style['empty_cells'] == 'show' or not cell.empty:
draw_border(stream, cell)
def draw_collapsed_borders(stream, table):
"""Draw borders of table cells when they collapse."""
row_heights = [
row.height for row_group in table.children
for row in row_group.children]
column_widths = table.column_widths
if not (row_heights and column_widths):
# One of the list is empty: don’t bother with empty tables
return
row_positions = [
row.position_y for row_group in table.children
for row in row_group.children]
column_positions = list(table.column_positions)
grid_height = len(row_heights)
grid_width = len(column_widths)
assert grid_width == len(column_positions)
# Add the end of the last column, but make a copy from the table attr.
if table.style['direction'] == 'ltr':
column_positions.append(column_positions[-1] + column_widths[-1])
else:
column_positions.insert(0, column_positions[0] + column_widths[0])
# Add the end of the last row. No copy here, we own this list
row_positions.append(row_positions[-1] + row_heights[-1])
vertical_borders, horizontal_borders = table.collapsed_border_grid
if table.children[0].is_header:
header_rows = len(table.children[0].children)
else:
header_rows = 0
if table.children[-1].is_footer:
footer_rows = len(table.children[-1].children)
else:
footer_rows = 0
skipped_rows = table.skipped_rows
if skipped_rows:
body_rows_offset = skipped_rows - header_rows
else:
body_rows_offset = 0
original_grid_height = len(vertical_borders)
footer_rows_offset = original_grid_height - grid_height
def row_number(y, horizontal):
# Examples in comments for 2 headers rows, 5 body rows, 3 footer rows
if header_rows and y < header_rows + int(horizontal):
# Row in header: y < 2 for vertical, y < 3 for horizontal
return y
elif footer_rows and y >= grid_height - footer_rows - int(horizontal):
# Row in footer: y >= 7 for vertical, y >= 6 for horizontal
return y + footer_rows_offset
else:
# Row in body: 2 >= y > 7 for vertical, 3 >= y > 6 for horizontal
return y + body_rows_offset
segments = []
def half_max_width(border_list, yx_pairs, vertical=True):
result = 0
for y, x in yx_pairs:
if (
(0 <= y < grid_height and 0 <= x <= grid_width)
if vertical else
(0 <= y <= grid_height and 0 <= x < grid_width)
):
yy = row_number(y, horizontal=not vertical)
_, (_, width, _) = border_list[yy][x]
result = max(result, width)
return result / 2
def add_vertical(x, y):
yy = row_number(y, horizontal=False)
score, (style, width, color) = vertical_borders[yy][x]
if width == 0 or color.alpha == 0:
return
pos_x = column_positions[x]
pos_y1 = row_positions[y]
if y != 0 or not table.skip_cell_border_top:
pos_y1 -= half_max_width(horizontal_borders, [
(y, x - 1), (y, x)], vertical=False)
pos_y2 = row_positions[y + 1]
if y != grid_height - 1 or not table.skip_cell_border_bottom:
pos_y2 += half_max_width(horizontal_borders, [
(y + 1, x - 1), (y + 1, x)], vertical=False)
segments.append((
score, style, width, color, 'left',
(pos_x - width / 2, pos_y1, 0, pos_y2 - pos_y1)))
def add_horizontal(x, y):
if y == 0 and table.skip_cell_border_top:
return
if y == grid_height and table.skip_cell_border_bottom:
return
yy = row_number(y, horizontal=True)
score, (style, width, color) = horizontal_borders[yy][x]
if width == 0 or color.alpha == 0:
return
pos_y = row_positions[y]
shift_before = half_max_width(vertical_borders, [(y - 1, x), (y, x)])
shift_after = half_max_width(
vertical_borders, [(y - 1, x + 1), (y, x + 1)])
if table.style['direction'] == 'ltr':
pos_x1 = column_positions[x] - shift_before
pos_x2 = column_positions[x + 1] + shift_after
else:
pos_x1 = column_positions[x + 1] - shift_after
pos_x2 = column_positions[x] + shift_before
segments.append((
score, style, width, color, 'top',
(pos_x1, pos_y - width / 2, pos_x2 - pos_x1, 0)))
for x in range(grid_width):
add_horizontal(x, 0)
for y in range(grid_height):
add_vertical(0, y)
for x in range(grid_width):
add_vertical(x + 1, y)
add_horizontal(x, y + 1)
# Sort bigger scores last (painted later, on top)
# Since the number of different scores is expected to be small compared
# to the number of segments, there should be little changes and Timsort
# should be closer to O(n) than O(n * log(n))
segments.sort(key=operator.itemgetter(0))
for segment in segments:
_, style, width, color, side, border_box = segment
if side == 'top':
widths = (width, 0, 0, 0)
else:
widths = (0, 0, 0, width)
with stacked(stream):
clip_border_segment(stream, style, width, side, border_box, widths)
draw_rect_border(
stream, border_box, widths, style,
styled_color(style, color, side))
def draw_replacedbox(stream, box):
"""Draw the given :class:`boxes.ReplacedBox` to a ``document.Stream``."""
if box.style['visibility'] != 'visible' or not box.width or not box.height:
return
draw_width, draw_height, draw_x, draw_y = replaced.replacedbox_layout(box)
if draw_width <= 0 or draw_height <= 0:
return
with stacked(stream):
rounded_box_path(stream, box.rounded_content_box())
stream.clip()
stream.end()
stream.transform(e=draw_x, f=draw_y)
stream.push_state()
# TODO: Use the real intrinsic size here, not affected by
# 'image-resolution'?
box.replacement.draw(
stream, draw_width, draw_height, box.style['image_rendering'])
stream.pop_state()
def draw_inline_level(stream, page, box, offset_x=0, text_overflow='clip',
block_ellipsis='none'):
if isinstance(box, StackingContext):
stacking_context = box
assert isinstance(
stacking_context.box, (boxes.InlineBlockBox, boxes.InlineFlexBox))
draw_stacking_context(stream, stacking_context)
else:
draw_background(stream, box.background)
draw_border(stream, box)
if isinstance(box, (boxes.InlineBox, boxes.LineBox)):
link_annotation = None
if isinstance(box, boxes.LineBox):
text_overflow = box.text_overflow
block_ellipsis = box.block_ellipsis
else:
link_annotation = box.link_annotation
ellipsis = 'none'
if link_annotation:
stream.begin_marked_content(box, mcid=True, tag='Link')
for i, child in enumerate(box.children):
if i == len(box.children) - 1:
# Last child
ellipsis = block_ellipsis
if isinstance(child, StackingContext):
child_offset_x = offset_x
else:
child_offset_x = (
offset_x + child.position_x - box.position_x)
if isinstance(child, boxes.TextBox):
draw_text(
stream, child, child_offset_x, text_overflow, ellipsis)
else:
draw_inline_level(
stream, page, child, child_offset_x, text_overflow,
ellipsis)
if link_annotation:
stream.end_marked_content()
elif isinstance(box, boxes.InlineReplacedBox):
draw_replacedbox(stream, box)
else:
assert isinstance(box, boxes.TextBox)
# Should only happen for list markers
draw_text(stream, box, offset_x, text_overflow)
def draw_text(stream, textbox, offset_x, text_overflow, block_ellipsis):
"""Draw a textbox to a pydyf stream."""
# Pango crashes with font-size: 0
assert textbox.style['font_size']