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_backend_agg.h
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/* -*- mode: c++; c-basic-offset: 4 -*- */
/* _backend_agg.h
*/
#ifndef __BACKEND_AGG_H__
#define __BACKEND_AGG_H__
#include <vector>
#include "agg_alpha_mask_u8.h"
#include "agg_conv_curve.h"
#include "agg_conv_dash.h"
#include "agg_conv_stroke.h"
#include "agg_image_accessors.h"
#include "agg_pixfmt_amask_adaptor.h"
#include "agg_pixfmt_gray.h"
#include "agg_pixfmt_rgba.h"
#include "agg_rasterizer_scanline_aa.h"
#include "agg_renderer_base.h"
#include "agg_renderer_scanline.h"
#include "agg_rendering_buffer.h"
#include "agg_scanline_bin.h"
#include "agg_scanline_p.h"
#include "agg_scanline_storage_aa.h"
#include "agg_scanline_storage_bin.h"
#include "agg_scanline_u.h"
#include "agg_span_allocator.h"
#include "agg_span_converter.h"
#include "agg_span_gouraud_rgba.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 "util/agg_color_conv_rgb8.h"
#include "_backend_agg_basic_types.h"
#include "path_converters.h"
#include "array.h"
#include "agg_workaround.h"
/**********************************************************************/
// a helper class to pass agg::buffer objects around. agg::buffer is
// a class in the swig wrapper
class BufferRegion
{
public:
BufferRegion(const agg::rect_i &r) : rect(r)
{
width = r.x2 - r.x1;
height = r.y2 - r.y1;
stride = width * 4;
data = new agg::int8u[stride * height];
}
virtual ~BufferRegion()
{
delete[] data;
};
agg::int8u *get_data()
{
return data;
}
agg::rect_i &get_rect()
{
return rect;
}
int get_width()
{
return width;
}
int get_height()
{
return height;
}
int get_stride()
{
return stride;
}
void to_string_argb(uint8_t *buf);
private:
agg::int8u *data;
agg::rect_i rect;
int width;
int height;
int stride;
private:
// prevent copying
BufferRegion(const BufferRegion &);
BufferRegion &operator=(const BufferRegion &);
};
#define MARKER_CACHE_SIZE 512
// the renderer
class RendererAgg
{
public:
typedef fixed_blender_rgba_plain<agg::rgba8, agg::order_rgba> fixed_blender_rgba32_plain;
typedef agg::pixfmt_alpha_blend_rgba<fixed_blender_rgba32_plain, agg::rendering_buffer> pixfmt;
typedef agg::renderer_base<pixfmt> renderer_base;
typedef agg::renderer_scanline_aa_solid<renderer_base> renderer_aa;
typedef agg::renderer_scanline_bin_solid<renderer_base> renderer_bin;
typedef agg::rasterizer_scanline_aa<agg::rasterizer_sl_clip_dbl> rasterizer;
typedef agg::scanline_p8 scanline_p8;
typedef agg::scanline_bin scanline_bin;
typedef agg::amask_no_clip_gray8 alpha_mask_type;
typedef agg::scanline_u8_am<alpha_mask_type> scanline_am;
typedef agg::renderer_base<agg::pixfmt_gray8> renderer_base_alpha_mask_type;
typedef agg::renderer_scanline_aa_solid<renderer_base_alpha_mask_type> renderer_alpha_mask_type;
/* TODO: Remove facepair_t */
typedef std::pair<bool, agg::rgba> facepair_t;
RendererAgg(unsigned int width, unsigned int height, double dpi);
virtual ~RendererAgg();
unsigned int get_width()
{
return width;
}
unsigned int get_height()
{
return height;
}
template <class PathIterator>
void draw_path(GCAgg &gc, PathIterator &path, agg::trans_affine &trans, agg::rgba &color);
template <class PathIterator>
void draw_markers(GCAgg &gc,
PathIterator &marker_path,
agg::trans_affine &marker_path_trans,
PathIterator &path,
agg::trans_affine &trans,
agg::rgba face);
template <class ImageArray>
void draw_text_image(GCAgg &gc, ImageArray &image, int x, int y, double angle);
template <class ImageArray>
void draw_image(GCAgg &gc,
double x,
double y,
ImageArray &image,
double w,
double h,
agg::trans_affine trans,
bool resize);
template <class PathGenerator,
class TransformArray,
class OffsetArray,
class ColorArray,
class LineWidthArray,
class AntialiasedArray>
void draw_path_collection(GCAgg &gc,
agg::trans_affine &master_transform,
PathGenerator &path,
TransformArray &transforms,
OffsetArray &offsets,
agg::trans_affine &offset_trans,
ColorArray &facecolors,
ColorArray &edgecolors,
LineWidthArray &linewidths,
DashesVector &linestyles,
AntialiasedArray &antialiaseds,
e_offset_position offset_position);
template <class CoordinateArray, class OffsetArray, class ColorArray>
void draw_quad_mesh(GCAgg &gc,
agg::trans_affine &master_transform,
size_t mesh_width,
size_t mesh_height,
CoordinateArray &coordinates,
OffsetArray &offsets,
agg::trans_affine &offset_trans,
ColorArray &facecolors,
bool antialiased,
ColorArray &edgecolors);
template <class PointArray, class ColorArray>
void draw_gouraud_triangle(GCAgg &gc,
PointArray &points,
ColorArray &colors,
agg::trans_affine &trans);
template <class PointArray, class ColorArray>
void draw_gouraud_triangles(GCAgg &gc,
PointArray &points,
ColorArray &colors,
agg::trans_affine &trans);
void tostring_rgb(uint8_t *buf);
void tostring_argb(uint8_t *buf);
void tostring_bgra(uint8_t *buf);
agg::rect_i get_content_extents();
void clear();
BufferRegion *copy_from_bbox(agg::rect_d in_rect);
void restore_region(BufferRegion ®);
void restore_region(BufferRegion ®ion, int x, int y, int xx1, int yy1, int xx2, int yy2);
unsigned int width, height;
double dpi;
size_t NUMBYTES; // the number of bytes in buffer
agg::int8u *pixBuffer;
agg::rendering_buffer renderingBuffer;
agg::int8u *alphaBuffer;
agg::rendering_buffer alphaMaskRenderingBuffer;
alpha_mask_type alphaMask;
agg::pixfmt_gray8 pixfmtAlphaMask;
renderer_base_alpha_mask_type rendererBaseAlphaMask;
renderer_alpha_mask_type rendererAlphaMask;
scanline_am scanlineAlphaMask;
scanline_p8 slineP8;
scanline_bin slineBin;
pixfmt pixFmt;
renderer_base rendererBase;
renderer_aa rendererAA;
renderer_bin rendererBin;
rasterizer theRasterizer;
void *lastclippath;
agg::trans_affine lastclippath_transform;
static const size_t HATCH_SIZE = 72;
agg::int8u hatchBuffer[HATCH_SIZE * HATCH_SIZE * 4];
agg::rendering_buffer hatchRenderingBuffer;
agg::rgba _fill_color;
protected:
inline double points_to_pixels(double points)
{
return points * dpi / 72.0;
}
template <class R>
void set_clipbox(const agg::rect_d &cliprect, R &rasterizer);
bool render_clippath(py::PathIterator &clippath, const agg::trans_affine &clippath_trans);
template <class PathIteratorType>
void _draw_path(PathIteratorType &path, bool has_clippath, const facepair_t &face, GCAgg &gc);
template <class PathIterator,
class PathGenerator,
class TransformArray,
class OffsetArray,
class ColorArray,
class LineWidthArray,
class AntialiasedArray>
void _draw_path_collection_generic(GCAgg &gc,
agg::trans_affine master_transform,
const agg::rect_d &cliprect,
PathIterator &clippath,
const agg::trans_affine &clippath_trans,
PathGenerator &path_generator,
TransformArray &transforms,
OffsetArray &offsets,
const agg::trans_affine &offset_trans,
ColorArray &facecolors,
ColorArray &edgecolors,
LineWidthArray &linewidths,
DashesVector &linestyles,
AntialiasedArray &antialiaseds,
e_offset_position offset_position,
int check_snap,
int has_curves);
template <class PointArray, class ColorArray>
void _draw_gouraud_triangle(PointArray &points,
ColorArray &colors,
agg::trans_affine trans,
bool has_clippath);
private:
void create_alpha_buffers();
// prevent copying
RendererAgg(const RendererAgg &);
RendererAgg &operator=(const RendererAgg &);
};
/***************************************************************************
* Implementation
*/
template <class path_t>
inline void
RendererAgg::_draw_path(path_t &path, bool has_clippath, const facepair_t &face, GCAgg &gc)
{
typedef agg::conv_stroke<path_t> stroke_t;
typedef agg::conv_dash<path_t> dash_t;
typedef agg::conv_stroke<dash_t> stroke_dash_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;
typedef agg::renderer_scanline_bin_solid<amask_ren_type> amask_bin_renderer_type;
// Render face
if (face.first) {
theRasterizer.add_path(path);
if (gc.isaa) {
if (has_clippath) {
pixfmt_amask_type pfa(pixFmt, alphaMask);
amask_ren_type r(pfa);
amask_aa_renderer_type ren(r);
ren.color(face.second);
agg::render_scanlines(theRasterizer, scanlineAlphaMask, ren);
} else {
rendererAA.color(face.second);
agg::render_scanlines(theRasterizer, slineP8, rendererAA);
}
} else {
if (has_clippath) {
pixfmt_amask_type pfa(pixFmt, alphaMask);
amask_ren_type r(pfa);
amask_bin_renderer_type ren(r);
ren.color(face.second);
agg::render_scanlines(theRasterizer, scanlineAlphaMask, ren);
} else {
rendererBin.color(face.second);
agg::render_scanlines(theRasterizer, slineP8, rendererBin);
}
}
}
// Render hatch
if (gc.has_hatchpath()) {
// Reset any clipping that may be in effect, since we'll be
// drawing the hatch in a scratch buffer at origin (0, 0)
theRasterizer.reset_clipping();
rendererBase.reset_clipping(true);
// Create and transform the path
typedef agg::conv_transform<py::PathIterator> hatch_path_trans_t;
typedef agg::conv_curve<hatch_path_trans_t> hatch_path_curve_t;
typedef agg::conv_stroke<hatch_path_curve_t> hatch_path_stroke_t;
py::PathIterator hatch_path(gc.hatchpath);
agg::trans_affine hatch_trans;
hatch_trans *= agg::trans_affine_scaling(1.0, -1.0);
hatch_trans *= agg::trans_affine_translation(0.0, 1.0);
hatch_trans *= agg::trans_affine_scaling(HATCH_SIZE, HATCH_SIZE);
hatch_path_trans_t hatch_path_trans(hatch_path, hatch_trans);
hatch_path_curve_t hatch_path_curve(hatch_path_trans);
hatch_path_stroke_t hatch_path_stroke(hatch_path_curve);
hatch_path_stroke.width(1.0);
hatch_path_stroke.line_cap(agg::square_cap);
// Render the path into the hatch buffer
pixfmt hatch_img_pixf(hatchRenderingBuffer);
renderer_base rb(hatch_img_pixf);
renderer_aa rs(rb);
rb.clear(_fill_color);
rs.color(gc.color);
theRasterizer.add_path(hatch_path_curve);
agg::render_scanlines(theRasterizer, slineP8, rs);
theRasterizer.add_path(hatch_path_stroke);
agg::render_scanlines(theRasterizer, slineP8, rs);
// Put clipping back on, if originally set on entry to this
// function
set_clipbox(gc.cliprect, theRasterizer);
if (has_clippath) {
render_clippath(gc.clippath.path, gc.clippath.trans);
}
// Transfer the hatch to the main image buffer
typedef agg::image_accessor_wrap<pixfmt,
agg::wrap_mode_repeat_auto_pow2,
agg::wrap_mode_repeat_auto_pow2> img_source_type;
typedef agg::span_pattern_rgba<img_source_type> span_gen_type;
agg::span_allocator<agg::rgba8> sa;
img_source_type img_src(hatch_img_pixf);
span_gen_type sg(img_src, 0, 0);
theRasterizer.add_path(path);
if (has_clippath) {
pixfmt_amask_type pfa(pixFmt, alphaMask);
amask_ren_type ren(pfa);
agg::render_scanlines_aa(theRasterizer, slineP8, ren, sa, sg);
} else {
agg::render_scanlines_aa(theRasterizer, slineP8, rendererBase, sa, sg);
}
}
// Render stroke
if (gc.linewidth != 0.0) {
double linewidth = points_to_pixels(gc.linewidth);
if (!gc.isaa) {
linewidth = (linewidth < 0.5) ? 0.5 : mpl_round(linewidth);
}
if (gc.dashes.size() == 0) {
stroke_t stroke(path);
stroke.width(points_to_pixels(gc.linewidth));
stroke.line_cap(gc.cap);
stroke.line_join(gc.join);
theRasterizer.add_path(stroke);
} else {
dash_t dash(path);
gc.dashes.dash_to_stroke(dash, dpi, gc.isaa);
stroke_dash_t stroke(dash);
stroke.line_cap(gc.cap);
stroke.line_join(gc.join);
stroke.width(linewidth);
theRasterizer.add_path(stroke);
}
if (gc.isaa) {
if (has_clippath) {
pixfmt_amask_type pfa(pixFmt, alphaMask);
amask_ren_type r(pfa);
amask_aa_renderer_type ren(r);
ren.color(gc.color);
agg::render_scanlines(theRasterizer, scanlineAlphaMask, ren);
} else {
rendererAA.color(gc.color);
agg::render_scanlines(theRasterizer, slineP8, rendererAA);
}
} else {
if (has_clippath) {
pixfmt_amask_type pfa(pixFmt, alphaMask);
amask_ren_type r(pfa);
amask_bin_renderer_type ren(r);
ren.color(gc.color);
agg::render_scanlines(theRasterizer, scanlineAlphaMask, ren);
} else {
rendererBin.color(gc.color);
agg::render_scanlines(theRasterizer, slineBin, rendererBin);
}
}
}
}
template <class PathIterator>
inline void
RendererAgg::draw_path(GCAgg &gc, PathIterator &path, agg::trans_affine &trans, agg::rgba &color)
{
typedef agg::conv_transform<py::PathIterator> transformed_path_t;
typedef PathNanRemover<transformed_path_t> nan_removed_t;
typedef PathClipper<nan_removed_t> clipped_t;
typedef PathSnapper<clipped_t> snapped_t;
typedef PathSimplifier<snapped_t> simplify_t;
typedef agg::conv_curve<simplify_t> curve_t;
typedef Sketch<curve_t> sketch_t;
facepair_t face(color.a != 0.0, color);
theRasterizer.reset_clipping();
rendererBase.reset_clipping(true);
set_clipbox(gc.cliprect, theRasterizer);
bool has_clippath = render_clippath(gc.clippath.path, gc.clippath.trans);
trans *= agg::trans_affine_scaling(1.0, -1.0);
trans *= agg::trans_affine_translation(0.0, (double)height);
bool clip = !face.first && gc.has_hatchpath() && !path.has_curves();
bool simplify = path.should_simplify() && clip;
double snapping_linewidth = points_to_pixels(gc.linewidth);
if (gc.color.a == 0.0) {
snapping_linewidth = 0.0;
}
transformed_path_t tpath(path, trans);
nan_removed_t nan_removed(tpath, true, path.has_curves());
clipped_t clipped(nan_removed, clip, width, height);
snapped_t snapped(clipped, gc.snap_mode, path.total_vertices(), snapping_linewidth);
simplify_t simplified(snapped, simplify, path.simplify_threshold());
curve_t curve(simplified);
sketch_t sketch(curve, gc.sketch.scale, gc.sketch.length, gc.sketch.randomness);
_draw_path(sketch, has_clippath, face, gc);
}
template <class PathIterator>
inline void RendererAgg::draw_markers(GCAgg &gc,
PathIterator &marker_path,
agg::trans_affine &marker_trans,
PathIterator &path,
agg::trans_affine &trans,
agg::rgba color)
{
typedef agg::conv_transform<py::PathIterator> transformed_path_t;
typedef PathNanRemover<transformed_path_t> nan_removed_t;
typedef PathSnapper<nan_removed_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;
// 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);
transformed_path_t marker_path_transformed(marker_path, marker_trans);
nan_removed_t marker_path_nan_removed(marker_path_transformed, true, marker_path.has_curves());
snap_t marker_path_snapped(marker_path_nan_removed,
gc.snap_mode,
marker_path.total_vertices(),
points_to_pixels(gc.linewidth));
curve_t marker_path_curve(marker_path_snapped);
transformed_path_t path_transformed(path, trans);
nan_removed_t path_nan_removed(path_transformed, false, false);
snap_t path_snapped(path_nan_removed, SNAP_FALSE, path.total_vertices(), 0.0);
curve_t path_curve(path_snapped);
path_curve.rewind(0);
facepair_t face(color.a != 0.0, color);
// maxim's suggestions for cached scanlines
agg::scanline_storage_aa8 scanlines;
theRasterizer.reset();
theRasterizer.reset_clipping();
rendererBase.reset_clipping(true);
agg::rect_i marker_size(0x7FFFFFFF, 0x7FFFFFFF, -0x7FFFFFFF, -0x7FFFFFFF);
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) {
theRasterizer.add_path(marker_path_curve);
agg::render_scanlines(theRasterizer, slineP8, scanlines);
fillSize = scanlines.byte_size();
if (fillSize >= MARKER_CACHE_SIZE) {
fillCache = new agg::int8u[fillSize];
}
scanlines.serialize(fillCache);
marker_size = agg::rect_i(scanlines.min_x(),
scanlines.min_y(),
scanlines.max_x(),
scanlines.max_y());
}
stroke_t stroke(marker_path_curve);
stroke.width(points_to_pixels(gc.linewidth));
stroke.line_cap(gc.cap);
stroke.line_join(gc.join);
theRasterizer.reset();
theRasterizer.add_path(stroke);
agg::render_scanlines(theRasterizer, slineP8, scanlines);
unsigned strokeSize = scanlines.byte_size();
if (strokeSize >= MARKER_CACHE_SIZE) {
strokeCache = new agg::int8u[strokeSize];
}
scanlines.serialize(strokeCache);
marker_size = agg::rect_i(std::min(marker_size.x1, scanlines.min_x()),
std::min(marker_size.y1, scanlines.min_y()),
std::max(marker_size.x2, scanlines.max_x()),
std::max(marker_size.y2, scanlines.max_y()));
theRasterizer.reset_clipping();
rendererBase.reset_clipping(true);
set_clipbox(gc.cliprect, rendererBase);
bool has_clippath = render_clippath(gc.clippath.path, 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(-1.0 - marker_size.x2,
-1.0 - marker_size.y2,
1.0 + width - marker_size.x1,
1.0 + height - marker_size.y1);
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);
}
/**
* 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();
}
};
template <class ImageArray>
inline void RendererAgg::draw_text_image(GCAgg &gc, ImageArray &image, int x, int y, double angle)
{
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;
theRasterizer.reset_clipping();
rendererBase.reset_clipping(true);
set_clipbox(gc.cliprect, theRasterizer);
agg::rendering_buffer srcbuf(
image.data(), (unsigned)image.dim(1), (unsigned)image.dim(0), (unsigned)image.dim(1));
agg::pixfmt_gray8 pixf_img(srcbuf);
agg::trans_affine mtx;
mtx *= agg::trans_affine_translation(0, -image.dim(0));
mtx *= agg::trans_affine_rotation(-angle * agg::pi / 180.0);
mtx *= agg::trans_affine_translation(x, y);
agg::path_storage rect;
rect.move_to(0, 0);
rect.line_to(image.dim(1), 0);
rect.line_to(image.dim(1), image.dim(0));
rect.line_to(0, image.dim(0));
rect.line_to(0, 0);
agg::conv_transform<agg::path_storage> rect2(rect, mtx);
agg::trans_affine inv_mtx(mtx);
inv_mtx.invert();
agg::image_filter_lut filter;
filter.calculate(agg::image_filter_spline36());
interpolator_type interpolator(inv_mtx);
color_span_alloc_type sa;
image_accessor_type ia(pixf_img, agg::gray8(0));
image_span_gen_type image_span_generator(ia, interpolator, filter);
span_gen_type output_span_generator(&image_span_generator, gc.color);
renderer_type ri(rendererBase, sa, output_span_generator);
theRasterizer.add_path(rect2);
agg::render_scanlines(theRasterizer, slineP8, ri);
}
class span_conv_alpha
{
public:
typedef agg::rgba8 color_type;
double m_alpha;
span_conv_alpha(double alpha) : m_alpha(alpha)
{
}
void prepare()
{
}
void generate(color_type *span, int x, int y, unsigned len) const
{
do {
span->a = (agg::int8u)((double)span->a * m_alpha);
++span;
} while (--len);
}
};
template <class ImageArray>
inline void RendererAgg::draw_image(GCAgg &gc,
double x,
double y,
ImageArray &image,
double w,
double h,
agg::trans_affine trans,
bool resize)
{
double alpha = gc.alpha;
theRasterizer.reset_clipping();
rendererBase.reset_clipping(true);
set_clipbox(gc.cliprect, theRasterizer);
bool has_clippath = render_clippath(gc.clippath.path, gc.clippath.trans);
agg::rendering_buffer buffer;
buffer.attach(
image.data(), (unsigned)image.dim(1), (unsigned)image.dim(0), -(int)image.dim(1) * 4);
pixfmt pixf(buffer);
if (resize | has_clippath) {
agg::trans_affine mtx;
agg::path_storage rect;
if (resize) {
mtx *= agg::trans_affine_scaling(1, -1);
mtx *= agg::trans_affine_translation(0, image.dim(0));
mtx *= agg::trans_affine_scaling(w / (image.dim(1)), h / (image.dim(0)));
mtx *= agg::trans_affine_translation(x, y);
mtx *= trans;
mtx *= agg::trans_affine_scaling(1.0, -1.0);
mtx *= agg::trans_affine_translation(0.0, (double)height);
} else {
mtx *= agg::trans_affine_translation((int)x, (int)(height - (y + image.dim(0))));
}
rect.move_to(0, 0);
rect.line_to(image.dim(1), 0);
rect.line_to(image.dim(1), image.dim(0));
rect.line_to(0, image.dim(0));
rect.line_to(0, 0);
agg::conv_transform<agg::path_storage> rect2(rect, mtx);
agg::trans_affine inv_mtx(mtx);
inv_mtx.invert();
typedef agg::span_allocator<agg::rgba8> color_span_alloc_type;
typedef agg::image_accessor_clip<pixfmt> image_accessor_type;
typedef agg::span_interpolator_linear<> interpolator_type;
typedef agg::span_image_filter_rgba_nn<image_accessor_type, interpolator_type>
image_span_gen_type;
typedef agg::span_converter<image_span_gen_type, span_conv_alpha> span_conv;
color_span_alloc_type sa;
image_accessor_type ia(pixf, agg::rgba8(0, 0, 0, 0));
interpolator_type interpolator(inv_mtx);
image_span_gen_type image_span_generator(ia, interpolator);
span_conv_alpha conv_alpha(alpha);
span_conv spans(image_span_generator, conv_alpha);
if (has_clippath) {
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<amask_ren_type, color_span_alloc_type, span_conv>
renderer_type_alpha;
pixfmt_amask_type pfa(pixFmt, alphaMask);
amask_ren_type r(pfa);
renderer_type_alpha ri(r, sa, spans);
theRasterizer.add_path(rect2);
agg::render_scanlines(theRasterizer, scanlineAlphaMask, ri);
} else {
typedef agg::renderer_base<pixfmt> ren_type;
typedef agg::renderer_scanline_aa<ren_type, color_span_alloc_type, span_conv>
renderer_type;
ren_type r(pixFmt);
renderer_type ri(r, sa, spans);
theRasterizer.add_path(rect2);
agg::render_scanlines(theRasterizer, slineP8, ri);
}
} else {
set_clipbox(gc.cliprect, rendererBase);
rendererBase.blend_from(
pixf, 0, (int)x, (int)(height - (y + image.dim(0))), (agg::int8u)(alpha * 255));
}
rendererBase.reset_clipping(true);
}
template <class PathIterator,
class PathGenerator,
class TransformArray,
class OffsetArray,
class ColorArray,
class LineWidthArray,
class AntialiasedArray>
inline void RendererAgg::_draw_path_collection_generic(GCAgg &gc,
agg::trans_affine master_transform,
const agg::rect_d &cliprect,
PathIterator &clippath,
const agg::trans_affine &clippath_trans,
PathGenerator &path_generator,
TransformArray &transforms,
OffsetArray &offsets,
const agg::trans_affine &offset_trans,
ColorArray &facecolors,
ColorArray &edgecolors,
LineWidthArray &linewidths,
DashesVector &linestyles,
AntialiasedArray &antialiaseds,
e_offset_position offset_position,
int check_snap,
int has_curves)
{
typedef agg::conv_transform<typename PathGenerator::path_iterator> transformed_path_t;
typedef PathNanRemover<transformed_path_t> nan_removed_t;
typedef PathClipper<nan_removed_t> clipped_t;
typedef PathSnapper<clipped_t> snapped_t;
typedef agg::conv_curve<snapped_t> snapped_curve_t;
typedef agg::conv_curve<clipped_t> curve_t;
if (offsets.dim(0) != 0 && offsets.dim(1) != 2) {
throw "Offsets array must be Nx2 or empty";
}
if (facecolors.dim(0) != 0 && facecolors.dim(1) != 4) {
throw "Facecolors array must be a Nx4 array or empty";
}
if (edgecolors.dim(0) != 0 && edgecolors.dim(1) != 4) {
throw "Edgecolors array must by Nx4 or empty";
}
if (transforms.dim(0) != 0 && (transforms.dim(1) != 3 || transforms.dim(2) != 3)) {
throw "Transforms array must by Nx3x3 or empty";
}
size_t Npaths = path_generator.num_paths();
size_t Noffsets = offsets.size();
size_t N = std::max(Npaths, Noffsets);
size_t Ntransforms = transforms.size();
size_t Nfacecolors = facecolors.size();
size_t Nedgecolors = edgecolors.size();
size_t Nlinewidths = linewidths.size();
size_t Nlinestyles = std::min(linestyles.size(), N);
size_t Naa = antialiaseds.size();
if ((Nfacecolors == 0 && Nedgecolors == 0) || Npaths == 0) {
return;
}
// Handle any clipping globally
theRasterizer.reset_clipping();
rendererBase.reset_clipping(true);
set_clipbox(cliprect, theRasterizer);
bool has_clippath = render_clippath(clippath, clippath_trans);
// Set some defaults, assuming no face or edge
gc.linewidth = 0.0;
facepair_t face;
face.first = Nfacecolors != 0;
agg::trans_affine trans;
for (int i = 0; i < (int)N; ++i) {
typename PathGenerator::path_iterator path = path_generator(i);
if (Ntransforms) {
typename TransformArray::sub_t subtrans = transforms[i % Ntransforms];
trans = agg::trans_affine(subtrans(0, 0),
subtrans(1, 0),
subtrans(0, 1),
subtrans(1, 1),
subtrans(0, 2),
subtrans(1, 2));
} else {
trans = master_transform;
}
if (Noffsets) {
double xo = offsets(i % Noffsets, 0);
double yo = offsets(i % Noffsets, 1);
offset_trans.transform(&xo, &yo);
if (offset_position == OFFSET_POSITION_DATA) {
trans = agg::trans_affine_translation(xo, yo) * trans;
} else {
trans *= agg::trans_affine_translation(xo, yo);
}
}
// These transformations must be done post-offsets
trans *= agg::trans_affine_scaling(1.0, -1.0);
trans *= agg::trans_affine_translation(0.0, (double)height);
if (Nfacecolors) {
typename ColorArray::sub_t facecolor = facecolors[i % Nfacecolors];
face.second = agg::rgba(facecolor(0), facecolor(1), facecolor(2), facecolor(3));
}
if (Nedgecolors) {
typename ColorArray::sub_t edgecolor = edgecolors[i % Nedgecolors];
gc.color = agg::rgba(edgecolor(0), edgecolor(1), edgecolor(2), edgecolor(3));