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Add (broken) support for clipping to the pdf paint engine

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This commit is contained in:
Kovid Goyal 2012-12-14 09:01:33 +05:30
parent b287b0e27f
commit 61cedb3282
1 changed files with 57 additions and 14 deletions
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53
src/calibre/ebooks/pdf/render/engine.py
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@ -39,7 +39,7 @@ class GraphicsState(object):
@property
def stack_reset_needed(self):
return 'transform' in self.ops
return 'transform' in self.ops or 'clip' in self.ops
def read_state(self, state):
flags = state.state()
@ -76,7 +76,15 @@ class GraphicsState(object):
self.ops['line_join'] = {Qt.MiterJoin:0, Qt.RoundJoin:1,
Qt.BevelJoin:2}.get(pen.joinStyle(), 0)
# TODO: Handle clipping
if flags & QPaintEngine.DirtyClipPath:
self.ops['clip'] = (state.clipOperation(), state.clipPath())
elif flags & QPaintEngine.DirtyClipRegion:
path = QPainterPath()
for rect in state.clipRegion().rects():
path.addRect(rect)
self.ops['clip'] = (state.clipOperation(), path)
# TODO: Add support for opacity
def __call__(self, engine):
canvas = engine.canvas
@ -94,6 +102,24 @@ class GraphicsState(object):
if 'transform' in ops:
engine.qt_system = ops['transform']
set_transform(ops['transform'], canvas.transform)
if 'clip' in ops:
prev_clip_path = engine.graphics_state.ops.get('clip', (None, None))[1]
op, path = ops['clip']
if op == Qt.ReplaceClip:
pass
elif op == Qt.IntersectClip:
if prev_clip_path is not None:
ops['clip'] = (op, path.intersected(prev_clip_path))
elif op == Qt.UniteClip:
if prev_clip_path is not None:
path.addPath(prev_clip_path)
else:
ops['clip'] = (Qt.NoClip, None)
path = ops['clip'][1]
if path is not None:
engine.set_clip(path)
if 'fill_color' in ops:
canvas.setFillColor(ops['fill_color'])
if 'stroke_color' in ops:
@ -203,7 +229,7 @@ class PdfEngine(QPaintEngine):
state = GraphicsState(state)
self.graphics_state = state(self)
def drawPath(self, path):
def convert_path(self, path):
p = self.canvas.beginPath()
path = path.simplified()
i = 0
@ -221,11 +247,24 @@ class PdfEngine(QPaintEngine):
path.elementAt(j).x, path.elementAt(j)), (i, i+1))
i += 2
p.curveTo(*(c1 + c2 + em))
with self:
return p
def drawPath(self, path):
p = self.convert_path(path)
old = self.canvas._fillMode
self.canvas._fillMode = {Qt.OddEvenFill:FILL_EVEN_ODD,
Qt.WindingFill:FILL_NON_ZERO}[path.fillRule()]
self.canvas.drawPath(p, stroke=self.do_stroke,
fill=self.do_fill)
self.canvas._fillMode = old
def set_clip(self, path):
p = self.convert_path(path)
old = self.canvas._fillMode
self.canvas._fillMode = {Qt.OddEvenFill:FILL_EVEN_ODD,
Qt.WindingFill:FILL_NON_ZERO}[path.fillRule()]
self.canvas.clipPath(p, fill=0, stroke=0)
self.canvas._fillMode = old
def drawPoints(self, points):
for point in points:
@ -304,12 +343,13 @@ class PdfEngine(QPaintEngine):
for point in points[1:]:
p.lineTo(*point)
p.close()
with self:
old = self.canvas._fillMode
self.canvas._fillMode = {self.OddEvenMode:FILL_EVEN_ODD,
self.WindingMode:FILL_NON_ZERO}.get(mode,
FILL_EVEN_ODD)
self.canvas.drawPath(p, fill=(mode in (self.OddEvenMode,
self.WindingMode, self.ConvexMode)))
self.canvas._fillMode = old
def __enter__(self):
self.canvas.saveState()
@ -362,6 +402,9 @@ if __name__ == '__main__':
p.begin(dev)
xmax, ymax = p.viewport().width(), p.viewport().height()
try:
cp = QPainterPath()
cp.addRect(0, 0, xmax, 1000)
p.setClipPath(cp)
p.drawRect(0, 0, xmax, ymax)
p.drawPolyline(QPoint(0, 0), QPoint(xmax, 0), QPoint(xmax, ymax),
QPoint(0, ymax), QPoint(0, 0))