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_backend_agg.cpp
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/* -*- mode: c++; c-basic-offset: 4 -*- */
/* A rewrite of _backend_agg using PyCXX to handle ref counting, etc..
*/
/* Python API mandates Python.h is included *first* */
#include "Python.h"
/* TODO: Remove this dependency */
#include "ft2font.h"
#include "_image.h"
#include "_backend_agg.h"
#include "mplutils.h"
#include <iostream>
#include <fstream>
#include <cmath>
#include <cstdio>
#include <stdexcept>
#include <time.h>
#include <algorithm>
#include "agg_conv_curve.h"
#include "agg_conv_transform.h"
#include "agg_image_accessors.h"
#include "agg_renderer_primitives.h"
#include "agg_scanline_storage_aa.h"
#include "agg_scanline_storage_bin.h"
#include "agg_span_allocator.h"
#include "agg_span_converter.h"
#include "agg_span_image_filter_gray.h"
#include "agg_span_image_filter_rgba.h"
#include "agg_span_interpolator_linear.h"
#include "agg_span_pattern_rgba.h"
#include "agg_span_gouraud_rgba.h"
#include "agg_conv_shorten_path.h"
#include "util/agg_color_conv_rgb8.h"
#include "MPL_isnan.h"
#include "numpy/arrayobject.h"
#include "agg_py_transforms.h"
#include "file_compat.h"
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
#ifndef M_PI_4
#define M_PI_4 0.785398163397448309616
#endif
#ifndef M_PI_2
#define M_PI_2 1.57079632679489661923
#endif
/*
Convert dashes from the Python representation as nested sequences to
the C++ representation as a std::vector<std::pair<double, double> >
(GCAgg::dash_t) */
void
convert_dashes(const Py::Tuple& dashes, double dpi,
GCAgg::dash_t& dashes_out, double& dashOffset_out)
{
if (dashes.length() != 2)
{
throw Py::ValueError(
Printf("Dash descriptor must be a length 2 tuple; found %d",
dashes.length()).str()
);
}
dashes_out.clear();
dashOffset_out = 0.0;
if (dashes[0].ptr() == Py_None)
{
return;
}
dashOffset_out = double(Py::Float(dashes[0])) * dpi / 72.0;
Py::SeqBase<Py::Object> dashSeq = dashes[1];
size_t Ndash = dashSeq.length();
if (Ndash % 2 != 0)
{
throw Py::ValueError(
Printf("Dash sequence must be an even length sequence; found %d", Ndash).str()
);
}
dashes_out.clear();
dashes_out.reserve(Ndash / 2);
double val0, val1;
for (size_t i = 0; i < Ndash; i += 2)
{
val0 = double(Py::Float(dashSeq[i])) * dpi / 72.0;
val1 = double(Py::Float(dashSeq[i+1])) * dpi / 72.0;
dashes_out.push_back(std::make_pair(val0, val1));
}
}
Py::Object
BufferRegion::to_string(const Py::Tuple &args)
{
// owned=true to prevent memory leak
#if PY3K
return Py::Bytes
#else
return Py::String
#endif
(PyBytes_FromStringAndSize((const char*)data, height*stride), true);
}
Py::Object
BufferRegion::set_x(const Py::Tuple &args)
{
args.verify_length(1);
size_t x = (long) Py::Int(args[0]);
rect.x1 = x;
return Py::Object();
}
Py::Object
BufferRegion::set_y(const Py::Tuple &args)
{
args.verify_length(1);
size_t y = (long)Py::Int(args[0]);
rect.y1 = y;
return Py::Object();
}
Py::Object
BufferRegion::get_extents(const Py::Tuple &args)
{
args.verify_length(0);
Py::Tuple extents(4);
extents[0] = Py::Int(rect.x1);
extents[1] = Py::Int(rect.y1);
extents[2] = Py::Int(rect.x2);
extents[3] = Py::Int(rect.y2);
return extents;
}
Py::Object
BufferRegion::to_string_argb(const Py::Tuple &args)
{
// owned=true to prevent memory leak
Py_ssize_t length;
unsigned char* pix;
unsigned char* begin;
unsigned char tmp;
size_t i, j;
PyObject* str = PyBytes_FromStringAndSize((const char*)data, height * stride);
if (PyBytes_AsStringAndSize(str, (char**)&begin, &length))
{
throw Py::TypeError("Could not create memory for blit");
}
for (i = 0; i < (size_t)height; ++i)
{
pix = begin + 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;
}
}
#if PY3K
return Py::Bytes
#else
return Py::String
#endif
(str, true);
}
GCAgg::GCAgg(const Py::Object &gc, double dpi) :
dpi(dpi), isaa(true), dashOffset(0.0)
{
_VERBOSE("GCAgg::GCAgg");
linewidth = points_to_pixels(gc.getAttr("_linewidth")) ;
alpha = Py::Float(gc.getAttr("_alpha"));
forced_alpha = Py::Boolean(gc.getAttr("_forced_alpha"));
color = get_color(gc);
_set_antialiased(gc);
_set_linecap(gc);
_set_joinstyle(gc);
_set_dashes(gc);
_set_clip_rectangle(gc);
_set_clip_path(gc);
_set_snap(gc);
_set_hatch_path(gc);
_set_sketch_params(gc);
}
void
GCAgg::_set_antialiased(const Py::Object& gc)
{
_VERBOSE("GCAgg::antialiased");
isaa = Py::Boolean(gc.getAttr("_antialiased"));
}
agg::rgba
GCAgg::get_color(const Py::Object& gc)
{
_VERBOSE("GCAgg::get_color");
Py::Tuple rgb = Py::Tuple(gc.getAttr("_rgb"));
double r = Py::Float(rgb[0]);
double g = Py::Float(rgb[1]);
double b = Py::Float(rgb[2]);
double a = Py::Float(rgb[3]);
return agg::rgba(r, g, b, a);
}
double
GCAgg::points_to_pixels(const Py::Object& points)
{
_VERBOSE("GCAgg::points_to_pixels");
double p = Py::Float(points) ;
return p * dpi / 72.0;
}
void
GCAgg::_set_linecap(const Py::Object& gc)
{
_VERBOSE("GCAgg::_set_linecap");
std::string capstyle = Py::String(gc.getAttr("_capstyle")).encode("utf-8");
if (capstyle == "butt")
{
cap = agg::butt_cap;
}
else if (capstyle == "round")
{
cap = agg::round_cap;
}
else if (capstyle == "projecting")
{
cap = agg::square_cap;
}
else
{
throw Py::ValueError(Printf("GC _capstyle attribute must be one of butt, round, projecting; found %s", capstyle.c_str()).str());
}
}
void
GCAgg::_set_joinstyle(const Py::Object& gc)
{
_VERBOSE("GCAgg::_set_joinstyle");
std::string joinstyle = Py::String(gc.getAttr("_joinstyle")).encode("utf-8");
if (joinstyle == "miter")
{
join = agg::miter_join_revert;
}
else if (joinstyle == "round")
{
join = agg::round_join;
}
else if (joinstyle == "bevel")
{
join = agg::bevel_join;
}
else
{
throw Py::ValueError(Printf("GC _joinstyle attribute must be one of butt, round, projecting; found %s", joinstyle.c_str()).str());
}
}
void
GCAgg::_set_dashes(const Py::Object& gc)
{
//return the dashOffset, dashes sequence tuple.
_VERBOSE("GCAgg::_set_dashes");
Py::Object dash_obj(gc.getAttr("_dashes"));
if (dash_obj.ptr() == Py_None)
{
dashes.clear();
return;
}
convert_dashes(dash_obj, dpi, dashes, dashOffset);
}
void
GCAgg::_set_clip_rectangle(const Py::Object& gc)
{
//set the clip rectangle from the gc
_VERBOSE("GCAgg::_set_clip_rectangle");
Py::Object o(gc.getAttr("_cliprect"));
cliprect = o;
}
void
GCAgg::_set_clip_path(const Py::Object& gc)
{
//set the clip path from the gc
_VERBOSE("GCAgg::_set_clip_path");
Py::Object method_obj = gc.getAttr("get_clip_path");
Py::Callable method(method_obj);
Py::Tuple path_and_transform = method.apply(Py::Tuple());
if (path_and_transform[0].ptr() != Py_None)
{
clippath = path_and_transform[0];
clippath_trans = py_to_agg_transformation_matrix(path_and_transform[1].ptr());
}
}
void
GCAgg::_set_snap(const Py::Object& gc)
{
//set the snap setting
_VERBOSE("GCAgg::_set_snap");
Py::Object method_obj = gc.getAttr("get_snap");
Py::Callable method(method_obj);
Py::Object py_snap = method.apply(Py::Tuple());
if (py_snap.isNone())
{
snap_mode = SNAP_AUTO;
}
else if (py_snap.isTrue())
{
snap_mode = SNAP_TRUE;
}
else
{
snap_mode = SNAP_FALSE;
}
}
void
GCAgg::_set_hatch_path(const Py::Object& gc)
{
_VERBOSE("GCAgg::_set_hatch_path");
Py::Object method_obj = gc.getAttr("get_hatch_path");
Py::Callable method(method_obj);
hatchpath = method.apply(Py::Tuple());
if (hatchpath.ptr() == NULL)
throw Py::Exception();
}
void
GCAgg::_set_sketch_params(const Py::Object& gc)
{
_VERBOSE("GCAgg::_get_sketch_params");
Py::Object method_obj = gc.getAttr("get_sketch_params");
Py::Callable method(method_obj);
Py::Object result = method.apply(Py::Tuple());
if (result.ptr() == Py_None) {
sketch_scale = 0.0;
} else {
Py::Tuple sketch_params(result);
sketch_scale = Py::Float(sketch_params[0]);
sketch_length = Py::Float(sketch_params[1]);
sketch_randomness = Py::Float(sketch_params[2]);
}
}
const size_t
RendererAgg::PIXELS_PER_INCH(96);
RendererAgg::RendererAgg(unsigned int width, unsigned int height, double dpi,
int debug) :
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(),
debug(debug),
_fill_color(agg::rgba(1, 1, 1, 0))
{
_VERBOSE("RendererAgg::RendererAgg");
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);
}
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);
}
}
template<class R>
void
RendererAgg::set_clipbox(const Py::Object& cliprect, R& rasterizer)
{
//set the clip rectangle from the gc
_VERBOSE("RendererAgg::set_clipbox");
double l, b, r, t;
if (py_convert_bbox(cliprect.ptr(), l, b, r, t))
{
rasterizer.clip_box(std::max(int(floor(l + 0.5)), 0),
std::max(int(floor(height - b + 0.5)), 0),
std::min(int(floor(r + 0.5)), int(width)),
std::min(int(floor(height - t + 0.5)), int(height)));
}
else
{
rasterizer.clip_box(0, 0, width, height);
}
_VERBOSE("RendererAgg::set_clipbox done");
}
std::pair<bool, agg::rgba>
RendererAgg::_get_rgba_face(const Py::Object& rgbFace, double alpha, bool forced_alpha)
{
_VERBOSE("RendererAgg::_get_rgba_face");
std::pair<bool, agg::rgba> face;
if (rgbFace.ptr() == Py_None)
{
face.first = false;
}
else
{
face.first = true;
Py::Tuple rgb = Py::Tuple(rgbFace);
if (forced_alpha || rgb.length() < 4)
{
face.second = rgb_to_color(rgb, alpha);
}
else
{
face.second = rgb_to_color(rgb, Py::Float(rgb[3]));
}
}
return face;
}
Py::Object
RendererAgg::copy_from_bbox(const Py::Tuple& args)
{
//copy region in bbox to buffer and return swig/agg buffer object
args.verify_length(1);
Py::Object box_obj = args[0];
double l, b, r, t;
if (!py_convert_bbox(box_obj.ptr(), l, b, r, t))
{
throw Py::TypeError("Invalid bbox provided to copy_from_bbox");
}
agg::rect_i rect((int)l, height - (int)t, (int)r, height - (int)b);
BufferRegion* reg = NULL;
try
{
reg = new BufferRegion(rect, true);
}
catch (...)
{
throw Py::MemoryError(
"RendererAgg::copy_from_bbox could not allocate memory for buffer");
}
if (!reg)
{
throw Py::MemoryError(
"RendererAgg::copy_from_bbox could not allocate memory for buffer");
}
try
{
agg::rendering_buffer rbuf;
rbuf.attach(reg->data, reg->width, reg->height, reg->stride);
pixfmt pf(rbuf);
renderer_base rb(pf);
rb.copy_from(renderingBuffer, &rect, -rect.x1, -rect.y1);
}
catch (...)
{
delete reg;
throw Py::RuntimeError("An unknown error occurred in copy_from_bbox");
}
return Py::asObject(reg);
}
Py::Object
RendererAgg::restore_region(const Py::Tuple& args)
{
//copy BufferRegion to buffer
args.verify_length(1);
BufferRegion* region = static_cast<BufferRegion*>(args[0].ptr());
if (region->data == NULL)
{
throw Py::ValueError("Cannot restore_region from NULL data");
}
agg::rendering_buffer rbuf;
rbuf.attach(region->data,
region->width,
region->height,
region->stride);
rendererBase.copy_from(rbuf, 0, region->rect.x1, region->rect.y1);
return Py::Object();
}
// Restore the part of the saved region with offsets
Py::Object
RendererAgg::restore_region2(const Py::Tuple& args)
{
//copy BufferRegion to buffer
args.verify_length(7);
int x(0), y(0), xx1(0), yy1(0), xx2(0), yy2(0);
try
{
xx1 = Py::Int(args[1]);
yy1 = Py::Int(args[2]);
xx2 = Py::Int(args[3]);
yy2 = Py::Int(args[4]);
x = Py::Int(args[5]);
y = Py::Int(args[6]);
}
catch (Py::TypeError)
{
throw Py::TypeError("Invalid input arguments to restore_region2");
}
BufferRegion* region = static_cast<BufferRegion*>(args[0].ptr());
if (region->data == NULL)
{
throw Py::ValueError("Cannot restore_region from NULL data");
}
agg::rect_i rect(xx1 - region->rect.x1, (yy1 - region->rect.y1),
xx2 - region->rect.x1, (yy2 - region->rect.y1));
agg::rendering_buffer rbuf;
rbuf.attach(region->data,
region->width,
region->height,
region->stride);
rendererBase.copy_from(rbuf, &rect, x, y);
return Py::Object();
}
bool
RendererAgg::render_clippath(const Py::Object& clippath,
const agg::trans_affine& clippath_trans)
{
typedef agg::conv_transform<PathIterator> transformed_path_t;
typedef agg::conv_curve<transformed_path_t> curve_t;
bool has_clippath = (clippath.ptr() != Py_None);
if (has_clippath &&
(clippath.ptr() != lastclippath.ptr() ||
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);
PathIterator clippath_iter(clippath);
rendererBaseAlphaMask.clear(agg::gray8(0, 0));
transformed_path_t transformed_clippath(clippath_iter, trans);
curve_t curved_clippath(transformed_clippath);
try {
theRasterizer.add_path(curved_clippath);
} catch (std::overflow_error &e) {
throw Py::OverflowError(e.what());
}
rendererAlphaMask.color(agg::gray8(255, 255));
agg::render_scanlines(theRasterizer, scanlineAlphaMask, rendererAlphaMask);
lastclippath = clippath;
lastclippath_transform = clippath_trans;
}
return has_clippath;
}
#define MARKER_CACHE_SIZE 512
Py::Object
RendererAgg::draw_markers(const Py::Tuple& args)
{
typedef agg::conv_transform<PathIterator> transformed_path_t;
typedef PathSnapper<transformed_path_t> snap_t;
typedef agg::conv_curve<snap_t> curve_t;
typedef agg::conv_stroke<curve_t> stroke_t;
typedef agg::pixfmt_amask_adaptor<pixfmt, alpha_mask_type> pixfmt_amask_type;
typedef agg::renderer_base<pixfmt_amask_type> amask_ren_type;
typedef agg::renderer_scanline_aa_solid<amask_ren_type> amask_aa_renderer_type;
args.verify_length(5, 6);
Py::Object gc_obj = args[0];
Py::Object marker_path_obj = args[1];
agg::trans_affine marker_trans = py_to_agg_transformation_matrix(args[2].ptr());
Py::Object path_obj = args[3];
agg::trans_affine trans = py_to_agg_transformation_matrix(args[4].ptr());
Py::Object face_obj;
if (args.size() == 6)
{
face_obj = args[5];
}
GCAgg gc(gc_obj, dpi);
// Deal with the difference in y-axis direction
marker_trans *= agg::trans_affine_scaling(1.0, -1.0);
trans *= agg::trans_affine_scaling(1.0, -1.0);
trans *= agg::trans_affine_translation(0.5, (double)height + 0.5);
PathIterator marker_path(marker_path_obj);
transformed_path_t marker_path_transformed(marker_path, marker_trans);
snap_t marker_path_snapped(marker_path_transformed,
gc.snap_mode,
marker_path.total_vertices(),
gc.linewidth);
curve_t marker_path_curve(marker_path_snapped);
PathIterator path(path_obj);
transformed_path_t path_transformed(path, trans);
snap_t path_snapped(path_transformed,
SNAP_FALSE,
path.total_vertices(),
0.0);
curve_t path_curve(path_snapped);
path_curve.rewind(0);
facepair_t face = _get_rgba_face(face_obj, gc.alpha, gc.forced_alpha);
//maxim's suggestions for cached scanlines
agg::scanline_storage_aa8 scanlines;
theRasterizer.reset();
theRasterizer.reset_clipping();
rendererBase.reset_clipping(true);
agg::int8u staticFillCache[MARKER_CACHE_SIZE];
agg::int8u staticStrokeCache[MARKER_CACHE_SIZE];
agg::int8u* fillCache = staticFillCache;
agg::int8u* strokeCache = staticStrokeCache;
try
{
unsigned fillSize = 0;
if (face.first)
{
try {
theRasterizer.add_path(marker_path_curve);
} catch (std::overflow_error &e) {
throw Py::OverflowError(e.what());
}
agg::render_scanlines(theRasterizer, slineP8, scanlines);
fillSize = scanlines.byte_size();
if (fillSize >= MARKER_CACHE_SIZE)
{
fillCache = new agg::int8u[fillSize];
}
scanlines.serialize(fillCache);
}
stroke_t stroke(marker_path_curve);
stroke.width(gc.linewidth);
stroke.line_cap(gc.cap);
stroke.line_join(gc.join);
theRasterizer.reset();
try {
theRasterizer.add_path(stroke);
} catch (std::overflow_error &e) {
throw Py::OverflowError(e.what());
}
agg::render_scanlines(theRasterizer, slineP8, scanlines);
unsigned strokeSize = scanlines.byte_size();
if (strokeSize >= MARKER_CACHE_SIZE)
{
strokeCache = new agg::int8u[strokeSize];
}
scanlines.serialize(strokeCache);
theRasterizer.reset_clipping();
rendererBase.reset_clipping(true);
set_clipbox(gc.cliprect, rendererBase);
bool has_clippath = render_clippath(gc.clippath, gc.clippath_trans);
double x, y;
agg::serialized_scanlines_adaptor_aa8 sa;
agg::serialized_scanlines_adaptor_aa8::embedded_scanline sl;
agg::rect_d clipping_rect(
-(scanlines.min_x() + 1.0),
(scanlines.max_y() + 1.0),
width + scanlines.max_x() + 1.0,
height - scanlines.min_y() + 1.0);
if (has_clippath)
{
while (path_curve.vertex(&x, &y) != agg::path_cmd_stop)
{
if (MPL_notisfinite64(x) || MPL_notisfinite64(y))
{
continue;
}
/* These values are correctly snapped above -- so we don't want
to round here, we really only want to truncate */
x = floor(x);
y = floor(y);
// Cull points outside the boundary of the image.
// Values that are too large may overflow and create
// segfaults.
// http://sourceforge.net/tracker/?func=detail&aid=2865490&group_id=80706&atid=560720
if (!clipping_rect.hit_test(x, y))
{
continue;
}
pixfmt_amask_type pfa(pixFmt, alphaMask);
amask_ren_type r(pfa);
amask_aa_renderer_type ren(r);
if (face.first)
{
ren.color(face.second);
sa.init(fillCache, fillSize, x, y);
agg::render_scanlines(sa, sl, ren);
}
ren.color(gc.color);
sa.init(strokeCache, strokeSize, x, y);
agg::render_scanlines(sa, sl, ren);
}
}
else
{
while (path_curve.vertex(&x, &y) != agg::path_cmd_stop)
{
if (MPL_notisfinite64(x) || MPL_notisfinite64(y))
{
continue;
}
/* These values are correctly snapped above -- so we don't want
to round here, we really only want to truncate */
x = floor(x);
y = floor(y);
// Cull points outside the boundary of the image.
// Values that are too large may overflow and create
// segfaults.
// http://sourceforge.net/tracker/?func=detail&aid=2865490&group_id=80706&atid=560720
if (!clipping_rect.hit_test(x, y))
{
continue;
}
if (face.first)
{
rendererAA.color(face.second);
sa.init(fillCache, fillSize, x, y);
agg::render_scanlines(sa, sl, rendererAA);
}
rendererAA.color(gc.color);
sa.init(strokeCache, strokeSize, x, y);
agg::render_scanlines(sa, sl, rendererAA);
}
}
}
catch (...)
{
if (fillCache != staticFillCache)
delete[] fillCache;
if (strokeCache != staticStrokeCache)
delete[] strokeCache;
theRasterizer.reset_clipping();
rendererBase.reset_clipping(true);
throw;
}
if (fillCache != staticFillCache)
delete[] fillCache;
if (strokeCache != staticStrokeCache)
delete[] strokeCache;
theRasterizer.reset_clipping();
rendererBase.reset_clipping(true);
return Py::Object();
}
/**
* This is a custom span generator that converts spans in the
* 8-bit inverted greyscale font buffer to rgba that agg can use.
*/
template<class ChildGenerator>
class font_to_rgba
{
public:
typedef ChildGenerator child_type;
typedef agg::rgba8 color_type;
typedef typename child_type::color_type child_color_type;
typedef agg::span_allocator<child_color_type> span_alloc_type;
private:
child_type* _gen;
color_type _color;
span_alloc_type _allocator;
public:
font_to_rgba(child_type* gen, color_type color) :
_gen(gen),
_color(color)
{
}
inline void
generate(color_type* output_span, int x, int y, unsigned len)
{
_allocator.allocate(len);
child_color_type* input_span = _allocator.span();
_gen->generate(input_span, x, y, len);
do
{
*output_span = _color;
output_span->a = ((unsigned int)_color.a *
(unsigned int)input_span->v) >> 8;
++output_span;
++input_span;
}
while (--len);
}
void
prepare()
{
_gen->prepare();
}
};
// MGDTODO: Support clip paths
Py::Object
RendererAgg::draw_text_image(const Py::Tuple& args)
{
_VERBOSE("RendererAgg::draw_text");
typedef agg::span_allocator<agg::rgba8> color_span_alloc_type;
typedef agg::span_interpolator_linear<> interpolator_type;
typedef agg::image_accessor_clip<agg::pixfmt_gray8> image_accessor_type;
typedef agg::span_image_filter_gray<image_accessor_type,
interpolator_type> image_span_gen_type;
typedef font_to_rgba<image_span_gen_type> span_gen_type;
typedef agg::renderer_scanline_aa<renderer_base, color_span_alloc_type,
span_gen_type> renderer_type;
args.verify_length(5);
const unsigned char* buffer = NULL;
int width, height;
Py::Object image_obj = args[0];
if (PyArray_Check(image_obj.ptr()))
{
PyObject* image_array = PyArray_FromObject(
image_obj.ptr(), PyArray_UBYTE, 2, 2);
if (!image_array)
{
throw Py::ValueError(
"First argument to draw_text_image must be a FT2Font.Image object or a Nx2 uint8 numpy array.");
}
image_obj = Py::Object(image_array, true);
buffer = (unsigned char *)PyArray_DATA(image_array);
width = PyArray_DIM(image_array, 1);
height = PyArray_DIM(image_array, 0);
}
else
{
FT2Image* image = static_cast<FT2Image *>(
Py::getPythonExtensionBase(image_obj.ptr()));
if (!image->get_buffer())
{
throw Py::ValueError(
"First argument to draw_text_image must be a FT2Font.Image object or a Nx2 uint8 numpy array.");
}
buffer = image->get_buffer();
width = image->get_width();
height = image->get_height();
}
int x(0), y(0);
try
{
x = Py::Int(args[1]);
y = Py::Int(args[2]);
}
catch (Py::TypeError)
{
throw Py::TypeError("Invalid input arguments to draw_text_image");
}
double angle = Py::Float(args[3]);
GCAgg gc(args[4], dpi);
theRasterizer.reset_clipping();
rendererBase.reset_clipping(true);
set_clipbox(gc.cliprect, theRasterizer);
agg::rendering_buffer srcbuf((agg::int8u*)buffer, width, height, width);
agg::pixfmt_gray8 pixf_img(srcbuf);
agg::trans_affine mtx;
mtx *= agg::trans_affine_translation(0, -height);
mtx *= agg::trans_affine_rotation(-angle * agg::pi / 180.0);
mtx *= agg::trans_affine_translation(x, y);