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+ impl composite method (TODO:add missing modes)

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This commit is contained in:
Artem Pavlenko 2010-07-03 20:08:49 +00:00
parent 4baccf2ee3
commit efa6010517
2 changed files with 65 additions and 1 deletions
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2
bindings/python/mapnik/__init__.py
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@ -631,7 +631,7 @@ setdlopenflags(flags)
# and ensure correct documentation processing
__all__ = [
# classes
'Color', 'Coord', 'ColorBand',
'Color', 'Coord', 'ColorBand', 'CompositeOp',
'DatasourceCache',
'Box2d',
'Feature', 'Featureset', 'FontEngine',

64
bindings/python/mapnik_image.cpp
View file

@ -38,6 +38,13 @@ extern "C"
#include <mapnik/image_reader.hpp>
#include <sstream>
// agg
#include "agg_rendering_buffer.h"
#include "agg_rasterizer_scanline_aa.h"
#include "agg_scanline_u.h"
#include "agg_renderer_scanline.h"
#include "agg_pixfmt_rgba.h"
// jpeg
#if defined(HAVE_JPEG)
#include <mapnik/jpeg_io.hpp>
@ -95,6 +102,56 @@ void blend (image_32 & im, unsigned x, unsigned y, image_32 const& im2, float op
im.set_rectangle_alpha2(im2.data(),x,y,opacity);
}
enum composite_mode_e
{
clear = 1,
src,
dst,
src_over,
dst_over,
src_in,
dst_in,
src_out,
dst_out,
multiply
};
void composite(image_32 & im, image_32 & im2, composite_mode_e mode)
{
typedef agg::rgba8 color;
typedef agg::order_bgra order;
typedef agg::pixel32_type pixel_type;
typedef agg::comp_op_adaptor_rgba<color, order> blender_type;
typedef agg::pixfmt_custom_blend_rgba<blender_type, agg::rendering_buffer> pixfmt_type;
typedef agg::renderer_base<pixfmt_type> renderer_type;
typedef agg::comp_op_adaptor_rgba<color, order> blender_type;
typedef agg::renderer_base<pixfmt_type> renderer_type;
agg::rendering_buffer source(im.raw_data(),im.width(),im.height(),im.width() * 4);
agg::rendering_buffer mask(im2.raw_data(),im2.width(),im2.height(),im2.width() * 4);
agg::pixfmt_custom_blend_rgba<blender_type, agg::rendering_buffer> pixf(source);
agg::pixfmt_custom_blend_rgba<blender_type, agg::rendering_buffer> pixf_mask(mask);
switch(mode)
{
case dst_out:
pixf.comp_op(agg::comp_op_dst_out);
break;
case src_out:
pixf.comp_op(agg::comp_op_src_out);
break;
case multiply:
pixf.comp_op(agg::comp_op_multiply);
break;
default:
break;
}
renderer_type ren(pixf);
agg::renderer_base<pixfmt_type> rb(pixf);
rb.blend_from(pixf_mask,0,0,0,255);
}
#if defined(HAVE_CAIRO) && defined(HAVE_PYCAIRO)
boost::shared_ptr<image_32> from_cairo(PycairoSurface* surface)
{
@ -107,6 +164,12 @@ boost::shared_ptr<image_32> from_cairo(PycairoSurface* surface)
void export_image()
{
using namespace boost::python;
enum_<composite_mode_e>("CompositeOp")
.value("src_out",src_out)
.value("dst_out",dst_out)
.value("multiply",multiply)
;
class_<image_32,boost::shared_ptr<image_32> >("Image","This class represents a 32 bit RGBA image.",init<int,int>())
.def("width",&image_32::width)
.def("height",&image_32::height)
@ -115,6 +178,7 @@ void export_image()
(&image_32::get_background,return_value_policy<copy_const_reference>()),
&image_32::set_background, "The background color of the image.")
.def("blend",&blend)
.def("composite",&composite)
.def("tostring",&tostring1)
.def("tostring",&tostring2)
.def("save", save_to_file1)