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#include "Rasterizer.hpp"
#include <ExPolygon.hpp>
#include <cstdint>
// For rasterizing
#include <agg/agg_basics.h>
#include <agg/agg_rendering_buffer.h>
#include <agg/agg_pixfmt_gray.h>
#include <agg/agg_pixfmt_rgb.h>
#include <agg/agg_renderer_base.h>
#include <agg/agg_renderer_scanline.h>
#include <agg/agg_scanline_p.h>
#include <agg/agg_rasterizer_scanline_aa.h>
#include <agg/agg_path_storage.h>
// For png compression
#include <png/writer.hpp>
namespace Slic3r {
class Raster::Impl {
public:
using TPixelRenderer = agg::pixfmt_gray8; // agg::pixfmt_rgb24;
using TRawRenderer = agg::renderer_base<TPixelRenderer>;
using TPixel = TPixelRenderer::color_type;
using TRawBuffer = agg::rendering_buffer;
using TBuffer = std::vector<TPixelRenderer::pixel_type>;
using TRendererAA = agg::renderer_scanline_aa_solid<TRawRenderer>;
static const TPixel ColorWhite;
static const TPixel ColorBlack;
using Origin = Raster::Origin;
private:
Raster::Resolution resolution_;
Raster::PixelDim pxdim_;
TBuffer buf_;
TRawBuffer rbuf_;
TPixelRenderer pixfmt_;
TRawRenderer raw_renderer_;
TRendererAA renderer_;
Origin o_;
std::function<void(agg::path_storage&)> flipy_ = [](agg::path_storage&) {};
public:
inline Impl(const Raster::Resolution& res, const Raster::PixelDim &pd,
Origin o):
resolution_(res), pxdim_(pd),
buf_(res.pixels()),
rbuf_(reinterpret_cast<TPixelRenderer::value_type*>(buf_.data()),
res.width_px, res.height_px,
res.width_px*TPixelRenderer::num_components),
pixfmt_(rbuf_),
raw_renderer_(pixfmt_),
renderer_(raw_renderer_),
o_(o)
{
renderer_.color(ColorWhite);
// If we would like to play around with gamma
// ras.gamma(agg::gamma_power(1.0));
clear();
if(o_ == Origin::TOP_LEFT) flipy_ = [this](agg::path_storage& path) {
path.flip_y(0, resolution_.height_px);
};
}
void draw(const ExPolygon &poly) {
agg::rasterizer_scanline_aa<> ras;
agg::scanline_p8 scanlines;
auto&& path = to_path(poly.contour);
flipy_(path);
ras.add_path(path);
for(auto h : poly.holes) {
auto&& holepath = to_path(h);
flipy_(holepath);
ras.add_path(holepath);
}
agg::render_scanlines(ras, scanlines, renderer_);
}
inline void clear() {
raw_renderer_.clear(ColorBlack);
}
inline TBuffer& buffer() { return buf_; }
inline const Raster::Resolution resolution() { return resolution_; }
inline Origin origin() const /*noexcept*/ { return o_; }
private:
double getPx(const Point& p) {
return p(0) * SCALING_FACTOR/pxdim_.w_mm;
}
double getPy(const Point& p) {
return p(1) * SCALING_FACTOR/pxdim_.h_mm;
}
agg::path_storage to_path(const Polygon& poly) {
agg::path_storage path;
auto it = poly.points.begin();
path.move_to(getPx(*it), getPy(*it));
while(++it != poly.points.end())
path.line_to(getPx(*it), getPy(*it));
path.line_to(getPx(poly.points.front()), getPy(poly.points.front()));
return path;
}
};
const Raster::Impl::TPixel Raster::Impl::ColorWhite = Raster::Impl::TPixel(255);
const Raster::Impl::TPixel Raster::Impl::ColorBlack = Raster::Impl::TPixel(0);
Raster::Raster(const Resolution &r, const PixelDim &pd, Origin o):
impl_(new Impl(r, pd, o)) {}
Raster::Raster() {}
Raster::~Raster() {}
Raster::Raster(Raster &&m):
impl_(std::move(m.impl_)) {}
void Raster::reset(const Raster::Resolution &r, const Raster::PixelDim &pd)
{
// Free up the unnecessary memory and make sure it stays clear after
// an exception
auto o = impl_? impl_->origin() : Origin::TOP_LEFT;
reset(r, pd, o);
}
void Raster::reset(const Raster::Resolution &r, const Raster::PixelDim &pd,
Raster::Origin o)
{
impl_.reset();
impl_.reset(new Impl(r, pd, o));
}
void Raster::reset()
{
impl_.reset();
}
Raster::Resolution Raster::resolution() const
{
if(impl_) return impl_->resolution();
return Resolution(0, 0);
}
void Raster::clear()
{
assert(impl_);
impl_->clear();
}
void Raster::draw(const ExPolygon &poly)
{
assert(impl_);
impl_->draw(poly);
}
void Raster::save(std::ostream& stream, Compression comp)
{
assert(impl_);
switch(comp) {
case Compression::PNG: {
png::writer<std::ostream> wr(stream);
wr.set_bit_depth(8);
wr.set_color_type(png::color_type_gray);
wr.set_width(resolution().width_px);
wr.set_height(resolution().height_px);
wr.set_compression_type(png::compression_type_default);
wr.write_info();
auto& b = impl_->buffer();
auto ptr = reinterpret_cast<png::byte*>( b.data() );
unsigned stride =
sizeof(Impl::TBuffer::value_type) * resolution().width_px;
for(unsigned r = 0; r < resolution().height_px; r++, ptr+=stride) {
wr.write_row(ptr);
}
break;
}
case Compression::RAW: {
stream << "P5 "
<< impl_->resolution().width_px << " "
<< impl_->resolution().height_px << " "
<< "255 ";
stream.write(reinterpret_cast<const char*>(impl_->buffer().data()),
impl_->buffer().size()*sizeof(Impl::TBuffer::value_type));
}
}
}
}
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