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Fix clipping, considering that the clip path depends on the current painter transform, therefore the order of updateState() operations matters. So only track if the clip has been updated and always re-apply if it has.

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This commit is contained in:
Kovid Goyal 2013-01-08 14:15:06 +05:30
parent d5e9c105ab
commit 6d1a9dcc29
1 changed files with 14 additions and 11 deletions
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21
src/calibre/ebooks/pdf/render/graphics.py
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@ -11,7 +11,7 @@ from math import sqrt
from collections import namedtuple
from PyQt4.Qt import (
QBrush, QPen, Qt, QPointF, QTransform, QPainterPath, QPaintEngine, QImage)
QBrush, QPen, Qt, QPointF, QTransform, QPaintEngine, QImage)
from calibre.ebooks.pdf.render.common import (
Name, Array, fmtnum, Stream, Dictionary)
@ -248,7 +248,7 @@ class TexturePattern(TilingPattern):
class GraphicsState(object):
FIELDS = ('fill', 'stroke', 'opacity', 'transform', 'brush_origin',
'clip', 'do_fill', 'do_stroke')
'clip_updated', 'do_fill', 'do_stroke')
def __init__(self):
self.fill = QBrush()
@ -256,7 +256,7 @@ class GraphicsState(object):
self.opacity = 1.0
self.transform = QTransform()
self.brush_origin = QPointF()
self.clip = QPainterPath()
self.clip_updated = False
self.do_fill = False
self.do_stroke = True
self.qt_pattern_cache = {}
@ -274,7 +274,7 @@ class GraphicsState(object):
ans.opacity = self.opacity
ans.transform = self.transform * QTransform()
ans.brush_origin = QPointF(self.brush_origin)
ans.clip = self.clip
ans.clip_updated = self.clip_updated
ans.do_fill, ans.do_stroke = self.do_fill, self.do_stroke
return ans
@ -311,7 +311,7 @@ class Graphics(object):
s.opacity = state.opacity()
if flags & QPaintEngine.DirtyClipPath or flags & QPaintEngine.DirtyClipRegion:
s.clip = painter.clipPath()
s.clip_updated = True
def reset(self):
self.current_state = GraphicsState()
@ -326,7 +326,7 @@ class Graphics(object):
ps = self.pending_state
pdf = self.pdf
if (ps.transform != pdf_state.transform or ps.clip != pdf_state.clip):
if ps.transform != pdf_state.transform or ps.clip_updated:
pdf.restore_stack()
pdf.save_stack()
pdf_state = self.base_state
@ -341,10 +341,13 @@ class Graphics(object):
pdf_state.brush_origin != ps.brush_origin):
self.apply_fill(ps, pdf_system, painter)
if (pdf_state.clip != ps.clip):
p = convert_path(ps.clip)
if ps.clip_updated:
ps.clip_updated = False
path = painter.clipPath()
if not path.isEmpty():
p = convert_path(path)
fill_rule = {Qt.OddEvenFill:'evenodd',
Qt.WindingFill:'winding'}[ps.clip.fillRule()]
Qt.WindingFill:'winding'}[path.fillRule()]
pdf.add_clip(p, fill_rule=fill_rule)
self.current_state = self.pending_state