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matplotlib/src/_backend_agg.cpp at boxplot-stat-transforms · phobson/matplotlib · GitHub
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/*
-*- mode: c++; c-basic-offset: 4 -*-
*/
#
define
NO_IMPORT_ARRAY
#
include
"
_backend_agg.h
"
#
include
"
mplutils.h
"
void
BufferRegion::to_string_argb
(
uint8_t
*buf)
{
unsigned
char
*pix;
unsigned
char
tmp;
size_t
i, j;
memcpy
(buf, data, height * stride);
for
(i =
0
; i < (
size_t
)height; ++i) {
pix = buf + i * stride;
for
(j =
0
; j < (
size_t
)width; ++j) {
//
Convert rgba to argb
tmp = pix[
2
];
pix[
2
] = pix[
0
];
pix[
0
] = tmp;
pix +=
4
;
}
}
}
RendererAgg::RendererAgg
(
unsigned
int
width,
unsigned
int
height,
double
dpi)
: width(width),
height(height),
dpi(dpi),
NUMBYTES(width * height *
4
),
pixBuffer(
NULL
),
renderingBuffer(),
alphaBuffer(
NULL
),
alphaMaskRenderingBuffer(),
alphaMask(alphaMaskRenderingBuffer),
pixfmtAlphaMask(alphaMaskRenderingBuffer),
rendererBaseAlphaMask(),
rendererAlphaMask(),
scanlineAlphaMask(),
slineP8(),
slineBin(),
pixFmt(),
rendererBase(),
rendererAA(),
rendererBin(),
theRasterizer(
8192
),
lastclippath(
NULL
),
_fill_color(agg::rgba(
1
,
1
,
1
,
0
))
{
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);
hatchRenderingBuffer.
attach
(hatchBuffer,
HATCH_SIZE
,
HATCH_SIZE
,
HATCH_SIZE
*
4
);
}
RendererAgg::~RendererAgg
()
{
delete[]
alphaBuffer;
delete[]
pixBuffer;
}
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 =
NULL
;
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
() ==
NULL
) {
throw
"
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,
0
, 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
() ==
NULL
) {
throw
"
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
(py::PathIterator &clippath,
const
agg::trans_affine &clippath_trans)
{
typedef
agg::conv_transform<py::PathIterator>
transformed_path_t
;
typedef
agg::conv_curve<
transformed_path_t
>
curve_t
;
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
));
transformed_path_t
transformed_clippath
(clippath, trans);
curve_t
curved_clippath
(transformed_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::tostring_rgb
(
uint8_t
*buf)
{
//
"Return the rendered buffer as an RGB string"
int
row_len = width *
3
;
agg::rendering_buffer renderingBufferTmp;
renderingBufferTmp.
attach
(buf, width, height, row_len);
agg::color_conv
(&renderingBufferTmp, &renderingBuffer,
agg::color_conv_rgba32_to_rgb24
());
}
void
RendererAgg::tostring_argb
(
uint8_t
*buf)
{
//
"Return the rendered buffer as an RGB string";
int
row_len = width *
4
;
agg::rendering_buffer renderingBufferTmp;
renderingBufferTmp.
attach
(buf, width, height, row_len);
agg::color_conv
(&renderingBufferTmp, &renderingBuffer,
agg::color_conv_rgba32_to_argb32
());
}
void
RendererAgg::tostring_bgra
(
uint8_t
*buf)
{
//
"Return the rendered buffer as an RGB string";
int
row_len = width *
4
;
agg::rendering_buffer renderingBufferTmp;
renderingBufferTmp.
attach
(buf, width, height, row_len);
agg::color_conv
(&renderingBufferTmp, &renderingBuffer,
agg::color_conv_rgba32_to_bgra32
());
}
agg::rect_i
RendererAgg::get_content_extents
()
{
agg::rect_i
r
(width, height,
0
,
0
);
//
Looks at the alpha channel to find the minimum extents of the image
unsigned
char
*pixel = pixBuffer +
3
;
for
(
int
y =
0
; y < (
int
)height; ++y) {
for
(
int
x =
0
; x < (
int
)width; ++x) {
if
(*pixel) {
if
(x < r.
x1
)
r.
x1
= x;
if
(y < r.
y1
)
r.
y1
= y;
if
(x > r.
x2
)
r.
x2
= x;
if
(y > r.
y2
)
r.
y2
= y;
}
pixel +=
4
;
}
}
r.
x1
=
std::max
(
0
, r.
x1
);
r.
y1
=
std::max
(
0
, r.
y1
);
r.
x2
=
std::min
(r.
x2
+
1
, (
int
)width);
r.
y2
=
std::min
(r.
y2
+
1
, (
int
)height);
return
r;
}
void
RendererAgg::clear
()
{
//
"clear the rendered buffer";
rendererBase.
clear
(_fill_color);
}
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