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matplotlib/src/_backend_agg.cpp at main · matplotlib/matplotlib · GitHub
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_backend_agg.cpp
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/*
-*- mode: c++; c-basic-offset: 4 -*-
*/
#
define
NO_IMPORT_ARRAY
#
include
<
Python.h
>
#
include
"
_backend_agg.h
"
RendererAgg::RendererAgg
(
unsigned
int
width,
unsigned
int
height,
double
dpi)
: width(width),
height(height),
dpi(dpi),
NUMBYTES((
size_t
)width * (
size_t
)height * 4),
pixBuffer(
nullptr
),
otherPixBuffer(
nullptr
),
renderingBuffer(),
alphaBuffer(
nullptr
),
alphaMaskRenderingBuffer(),
alphaMask(alphaMaskRenderingBuffer),
pixfmtAlphaMask(alphaMaskRenderingBuffer),
rendererBaseAlphaMask(),
rendererAlphaMask(),
scanlineAlphaMask(),
slineP8(),
slineBin(),
pixFmt(),
rendererBase(),
rendererAA(),
rendererBin(),
theRasterizer(
32768
),
lastclippath(
nullptr
),
_fill_color(agg::rgba(
1
,
1
,
1
,
0
))
{
if
(dpi <=
0.0
) {
throw
std::range_error
(
"
dpi must be positive
"
);
}
if
(width >=
1
<<
23
|| height >=
1
<<
23
) {
throw
std::range_error
(
"
Image size of
"
+
std::to_string
(width) +
"
x
"
+
std::to_string
(height) +
"
pixels is too large. It must be less than 2^23 in each direction.
"
);
}
unsigned
stride
(width *
4
);
pixBuffer =
new
agg::int8u[
NUMBYTES
];
renderingBuffer.
attach
(pixBuffer, width, height, stride);
pixFmt.
attach
(renderingBuffer);
rendererBase.
attach
(pixFmt);
rendererBase.
clear
(_fill_color);
rendererAA.
attach
(rendererBase);
rendererBin.
attach
(rendererBase);
hatch_size =
int
(dpi);
hatchBuffer =
new
agg::int8u[hatch_size * hatch_size *
4
];
hatchRenderingBuffer.
attach
(hatchBuffer, hatch_size, hatch_size, hatch_size *
4
);
}
RendererAgg::~RendererAgg
()
{
delete[]
hatchBuffer;
delete[]
alphaBuffer;
delete[]
pixBuffer;
delete[]
otherPixBuffer;
}
void
RendererAgg::create_alpha_buffers
()
{
if
(!alphaBuffer) {
alphaBuffer =
new
agg::int8u[width * height];
alphaMaskRenderingBuffer.
attach
(alphaBuffer, width, height, width);
rendererBaseAlphaMask.
attach
(pixfmtAlphaMask);
rendererAlphaMask.
attach
(rendererBaseAlphaMask);
}
}
BufferRegion *
RendererAgg::copy_from_bbox
(agg::rect_d in_rect)
{
agg::rect_i
rect
(
(
int
)in_rect.
x1
, height - (
int
)in_rect.
y2
, (
int
)in_rect.
x2
, height - (
int
)in_rect.
y1
);
BufferRegion *reg =
nullptr
;
reg =
new
BufferRegion
(rect);
agg::rendering_buffer rbuf;
rbuf.
attach
(reg->
get_data
(), reg->
get_width
(), reg->
get_height
(), reg->
get_stride
());
pixfmt
pf
(rbuf);
renderer_base
rb
(pf);
rb.
copy_from
(renderingBuffer, &rect, -rect.
x1
, -rect.
y1
);
return
reg;
}
void
RendererAgg::restore_region
(BufferRegion ®ion)
{
if
(region.
get_data
() ==
nullptr
) {
throw
std::runtime_error
(
"
Cannot restore_region from NULL data
"
);
}
agg::rendering_buffer rbuf;
rbuf.
attach
(region.
get_data
(), region.
get_width
(), region.
get_height
(), region.
get_stride
());
rendererBase.
copy_from
(rbuf,
nullptr
, region.
get_rect
().
x1
, region.
get_rect
().
y1
);
}
//
Restore the part of the saved region with offsets
void
RendererAgg::restore_region
(BufferRegion ®ion,
int
xx1,
int
yy1,
int
xx2,
int
yy2,
int
x,
int
y )
{
if
(region.
get_data
() ==
nullptr
) {
throw
std::runtime_error
(
"
Cannot restore_region from NULL data
"
);
}
agg::rect_i &rrect = region.
get_rect
();
agg::rect_i
rect
(xx1 - rrect.
x1
, (yy1 - rrect.
y1
), xx2 - rrect.
x1
, (yy2 - rrect.
y1
));
agg::rendering_buffer rbuf;
rbuf.
attach
(region.
get_data
(), region.
get_width
(), region.
get_height
(), region.
get_stride
());
rendererBase.
copy_from
(rbuf, &rect, x, y);
}
bool
RendererAgg::render_clippath
(mpl::PathIterator &clippath,
const
agg::trans_affine &clippath_trans,
e_snap_mode snap_mode)
{
bool
has_clippath = (clippath.
total_vertices
() !=
0
);
if
(has_clippath &&
(clippath.
get_id
() != lastclippath || clippath_trans != lastclippath_transform)) {
create_alpha_buffers
();
agg::trans_affine
trans
(clippath_trans);
trans *=
agg::trans_affine_scaling
(
1.0
, -
1.0
);
trans *=
agg::trans_affine_translation
(
0.0
, (
double
)height);
rendererBaseAlphaMask.
clear
(
agg::gray8
(
0
,
0
));
auto
transformed_clippath = agg::conv_transform{clippath, trans};
auto
nan_removed_clippath = PathNanRemover{
transformed_clippath,
true
, clippath.
has_codes
()};
//
Unlike normal Paths, the clip path cannot be clipped to the Figure
//
bbox, because it needs to remain a complete closed path, so there is
//
no PathClipper step after nan-removal.
auto
snapped_clippath = PathSnapper{
nan_removed_clippath, snap_mode, clippath.
total_vertices
(),
0.0
};
auto
simplified_clippath = PathSimplifier{
snapped_clippath,
clippath.
should_simplify
() && !clippath.
has_codes
(),
clippath.
simplify_threshold
()};
auto
curved_clippath = agg::conv_curve{simplified_clippath};
theRasterizer.
add_path
(curved_clippath);
rendererAlphaMask.
color
(
agg::gray8
(
255
,
255
));
agg::render_scanlines
(theRasterizer, scanlineAlphaMask, rendererAlphaMask);
lastclippath = clippath.
get_id
();
lastclippath_transform = clippath_trans;
}
return
has_clippath;
}
void
RendererAgg::clear
()
{
//
"clear the rendered buffer";
rendererBase.
clear
(_fill_color);
}
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