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// SPDX-License-Identifier: GPL-2.0-or-later
/**
* @file
* Bitmap image belonging to an SVG drawing.
*//*
* Authors:
* Krzysztof Kosiński <tweenk.pl@gmail.com>
*
* Copyright (C) 2011 Authors
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include <2geom/bezier-curve.h>
#include "drawing.h"
#include "drawing-context.h"
#include "drawing-image.h"
#include "cairo-utils.h"
#include "cairo-templates.h"
namespace Inkscape {
DrawingImage::DrawingImage(Drawing &drawing)
: DrawingItem(drawing)
, style_image_rendering(SP_CSS_IMAGE_RENDERING_AUTO)
{
}
void DrawingImage::setPixbuf(std::shared_ptr<Inkscape::Pixbuf const> pixbuf)
{
defer([this, pixbuf = std::move(pixbuf)] () mutable {
_pixbuf = std::move(pixbuf);
_markForUpdate(STATE_ALL, false);
});
}
void DrawingImage::setScale(double sx, double sy)
{
defer([=] {
_scale = Geom::Scale(sx, sy);
_markForUpdate(STATE_ALL, false);
});
}
void DrawingImage::setOrigin(Geom::Point const &origin)
{
defer([=] {
_origin = origin;
_markForUpdate(STATE_ALL, false);
});
}
void DrawingImage::setClipbox(Geom::Rect const &box)
{
defer([=] {
_clipbox = box;
_markForUpdate(STATE_ALL, false);
});
}
Geom::Rect DrawingImage::bounds() const
{
if (!_pixbuf) return _clipbox;
double pw = _pixbuf->width();
double ph = _pixbuf->height();
double vw = pw * _scale[Geom::X];
double vh = ph * _scale[Geom::Y];
Geom::Point wh(vw, vh);
Geom::Rect view(_origin, _origin+wh);
Geom::OptRect res = _clipbox & view;
Geom::Rect ret = res ? *res : _clipbox;
return ret;
}
void DrawingImage::setStyle(SPStyle const *style, SPStyle const *context_style)
{
DrawingItem::setStyle(style, context_style);
auto image_rendering = SP_CSS_IMAGE_RENDERING_AUTO;
if (_style) {
image_rendering = _style->image_rendering.computed;
}
defer([=] {
style_image_rendering = image_rendering;
});
}
unsigned DrawingImage::_updateItem(Geom::IntRect const &, UpdateContext const &, unsigned, unsigned)
{
// Calculate bbox
if (_pixbuf) {
Geom::Rect r = bounds() * _ctm;
_bbox = r.roundOutwards();
} else {
_bbox = Geom::OptIntRect();
}
return STATE_ALL;
}
unsigned DrawingImage::_renderItem(DrawingContext &dc, RenderContext &rc, Geom::IntRect const &/*area*/, unsigned flags, DrawingItem const */*stop_at*/) const
{
bool const outline = (flags & RENDER_OUTLINE) && !_drawing.imageOutlineMode();
if (!outline) {
if (!_pixbuf) return RENDER_OK;
Inkscape::DrawingContext::Save save(dc);
dc.transform(_ctm);
dc.newPath();
dc.rectangle(_clipbox);
dc.clip();
dc.translate(_origin);
dc.scale(_scale);
// const_cast required since Cairo needs to modify the internal refcount variable, but we do not want to give up the
// benefits of const for the rest of our code. The underlying object is guaranteed to be non-const, so this is well-defined.
// It is also thread-safe to modify the refcount in this way, since Cairo uses atomics internally.
dc.setSource(const_cast<cairo_surface_t*>(_pixbuf->getSurfaceRaw()), 0, 0);
dc.patternSetExtend(CAIRO_EXTEND_PAD);
// See: http://www.w3.org/TR/SVG/painting.html#ImageRenderingProperty
// https://drafts.csswg.org/css-images-3/#the-image-rendering
// style.h/style.cpp, cairo-render-context.cpp
//
// CSS 3 defines:
// 'optimizeSpeed' as alias for "pixelated"
// 'optimizeQuality' as alias for "smooth"
switch (style_image_rendering) {
case SP_CSS_IMAGE_RENDERING_OPTIMIZESPEED:
case SP_CSS_IMAGE_RENDERING_PIXELATED:
// we don't have an implementation for crisp-edges, but it should *not* smooth or blur
case SP_CSS_IMAGE_RENDERING_CRISPEDGES:
dc.patternSetFilter( CAIRO_FILTER_NEAREST );
break;
case SP_CSS_IMAGE_RENDERING_AUTO:
case SP_CSS_IMAGE_RENDERING_OPTIMIZEQUALITY:
default:
// In recent Cairo, BEST used Lanczos3, which is prohibitively slow
dc.patternSetFilter( CAIRO_FILTER_GOOD );
break;
}
// Handle an exceptional case where the greyscale color mode needs to be applied per-image.
bool const greyscale_exception = (flags & RENDER_OUTLINE) && _drawing.colorMode() == ColorMode::GRAYSCALE;
if (greyscale_exception) {
dc.pushGroup();
}
dc.paint();
if (greyscale_exception) {
ink_cairo_surface_filter(dc.rawTarget(), dc.rawTarget(), _drawing.grayscaleMatrix());
dc.popGroupToSource();
dc.paint();
}
} else { // outline; draw a rect instead
auto rgba = _drawing.imageOutlineColor();
{ Inkscape::DrawingContext::Save save(dc);
dc.transform(_ctm);
dc.newPath();
Geom::Rect r = bounds();
Geom::Point c00 = r.corner(0);
Geom::Point c01 = r.corner(3);
Geom::Point c11 = r.corner(2);
Geom::Point c10 = r.corner(1);
dc.moveTo(c00);
// the box
dc.lineTo(c10);
dc.lineTo(c11);
dc.lineTo(c01);
dc.lineTo(c00);
// the diagonals
dc.lineTo(c11);
dc.moveTo(c10);
dc.lineTo(c01);
}
dc.setLineWidth(0.5);
dc.setSource(rgba);
dc.stroke();
}
return RENDER_OK;
}
/** Calculates the closest distance from p to the segment a1-a2*/
static double distance_to_segment(Geom::Point const &p, Geom::Point const &a1, Geom::Point const &a2)
{
Geom::LineSegment l(a1, a2);
Geom::Point np = l.pointAt(l.nearestTime(p));
return Geom::distance(np, p);
}
DrawingItem *DrawingImage::_pickItem(Geom::Point const &p, double delta, unsigned flags)
{
if (!_pixbuf) return nullptr;
bool outline = (flags & PICK_OUTLINE) && !_drawing.imageOutlineMode();
if (outline) {
Geom::Rect r = bounds();
Geom::Point pick = p * _ctm.inverse();
// find whether any side or diagonal is within delta
// to do so, iterate over all pairs of corners
for (unsigned i = 0; i < 3; ++i) { // for i=3, there is nothing to do
for (unsigned j = i+1; j < 4; ++j) {
if (distance_to_segment(pick, r.corner(i), r.corner(j)) < delta) {
return this;
}
}
}
return nullptr;
} else {
auto pixels = _pixbuf->pixels();
int width = _pixbuf->width();
int height = _pixbuf->height();
size_t rowstride = _pixbuf->rowstride();
Geom::Point tp = p * _ctm.inverse();
Geom::Rect r = bounds();
if (!r.contains(tp))
return nullptr;
double vw = width * _scale[Geom::X];
double vh = height * _scale[Geom::Y];
int ix = floor((tp[Geom::X] - _origin[Geom::X]) / vw * width);
int iy = floor((tp[Geom::Y] - _origin[Geom::Y]) / vh * height);
if ((ix < 0) || (iy < 0) || (ix >= width) || (iy >= height))
return nullptr;
auto pix_ptr = pixels + iy * rowstride + ix * 4;
// pick if the image is less than 99% transparent
guint32 alpha = 0;
if (_pixbuf->pixelFormat() == Inkscape::Pixbuf::PF_CAIRO) {
guint32 px = *reinterpret_cast<guint32 const *>(pix_ptr);
alpha = (px & 0xff000000) >> 24;
} else if (_pixbuf->pixelFormat() == Inkscape::Pixbuf::PF_GDK) {
alpha = pix_ptr[3];
} else {
throw std::runtime_error("Unrecognized pixel format");
}
float alpha_f = (alpha / 255.0f) * _opacity;
return alpha_f > 0.01 ? this : nullptr;
}
}
} // namespace Inkscape
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
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