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Diffstat (limited to 'src/display/cairo-utils.cpp')
| -rw-r--r-- | src/display/cairo-utils.cpp | 1962 |
1 files changed, 1962 insertions, 0 deletions
diff --git a/src/display/cairo-utils.cpp b/src/display/cairo-utils.cpp new file mode 100644 index 0000000..68a7e4a --- /dev/null +++ b/src/display/cairo-utils.cpp @@ -0,0 +1,1962 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Helper functions to use cairo with inkscape + * + * Copyright (C) 2007 bulia byak + * Copyright (C) 2008 Johan Engelen + * + * Released under GNU GPL v2+, read the file 'COPYING' for more information. + * + */ + +#include "display/cairo-utils.h" + +#include <stdexcept> + +#include <glib/gstdio.h> +#include <glibmm/fileutils.h> +#include <gdk-pixbuf/gdk-pixbuf.h> + +#include <2geom/pathvector.h> +#include <2geom/curves.h> +#include <2geom/affine.h> +#include <2geom/point.h> +#include <2geom/path.h> +#include <2geom/transforms.h> +#include <2geom/sbasis-to-bezier.h> + +#include <boost/algorithm/string.hpp> +#include <boost/operators.hpp> +#include <boost/optional/optional.hpp> + +#include "color.h" +#include "cairo-templates.h" +#include "document.h" +#include "preferences.h" +#include "util/units.h" +#include "helper/pixbuf-ops.h" + + +/** + * Key for cairo_surface_t to keep track of current color interpolation value + * Only the address of the structure is used, it is never initialized. See: + * http://www.cairographics.org/manual/cairo-Types.html#cairo-user-data-key-t + */ +cairo_user_data_key_t ink_color_interpolation_key; +cairo_user_data_key_t ink_pixbuf_key; + +namespace Inkscape { + +CairoGroup::CairoGroup(cairo_t *_ct) : ct(_ct), pushed(false) {} +CairoGroup::~CairoGroup() { + if (pushed) { + cairo_pattern_t *p = cairo_pop_group(ct); + cairo_pattern_destroy(p); + } +} +void CairoGroup::push() { + cairo_push_group(ct); + pushed = true; +} +void CairoGroup::push_with_content(cairo_content_t content) { + cairo_push_group_with_content(ct, content); + pushed = true; +} +cairo_pattern_t *CairoGroup::pop() { + if (pushed) { + cairo_pattern_t *ret = cairo_pop_group(ct); + pushed = false; + return ret; + } else { + throw std::logic_error("Cairo group popped without pushing it first"); + } +} +Cairo::RefPtr<Cairo::Pattern> CairoGroup::popmm() { + if (pushed) { + cairo_pattern_t *ret = cairo_pop_group(ct); + Cairo::RefPtr<Cairo::Pattern> retmm(new Cairo::Pattern(ret, true)); + pushed = false; + return retmm; + } else { + throw std::logic_error("Cairo group popped without pushing it first"); + } +} +void CairoGroup::pop_to_source() { + if (pushed) { + cairo_pop_group_to_source(ct); + pushed = false; + } +} + +CairoContext::CairoContext(cairo_t *obj, bool ref) + : Cairo::Context(obj, ref) +{} + +void CairoContext::transform(Geom::Affine const &m) +{ + cairo_matrix_t cm; + cm.xx = m[0]; + cm.xy = m[2]; + cm.x0 = m[4]; + cm.yx = m[1]; + cm.yy = m[3]; + cm.y0 = m[5]; + cairo_transform(cobj(), &cm); +} + +void CairoContext::set_source_rgba32(guint32 color) +{ + double red = SP_RGBA32_R_F(color); + double gre = SP_RGBA32_G_F(color); + double blu = SP_RGBA32_B_F(color); + double alp = SP_RGBA32_A_F(color); + cairo_set_source_rgba(cobj(), red, gre, blu, alp); +} + +void CairoContext::append_path(Geom::PathVector const &pv) +{ + feed_pathvector_to_cairo(cobj(), pv); +} + +Cairo::RefPtr<CairoContext> CairoContext::create(Cairo::RefPtr<Cairo::Surface> const &target) +{ + cairo_t *ct = cairo_create(target->cobj()); + Cairo::RefPtr<CairoContext> ret(new CairoContext(ct, true)); + return ret; +} + + +/* The class below implement the following hack: + * + * The pixels formats of Cairo and GdkPixbuf are different. + * GdkPixbuf accesses pixels as bytes, alpha is not premultiplied, + * and successive bytes of a single pixel contain R, G, B and A components. + * Cairo accesses pixels as 32-bit ints, alpha is premultiplied, + * and each int contains as 0xAARRGGBB, accessed with bitwise operations. + * + * In other words, on a little endian system, a GdkPixbuf will contain: + * char *data = "rgbargbargba...." + * int *data = { 0xAABBGGRR, 0xAABBGGRR, 0xAABBGGRR, ... } + * while a Cairo image surface will contain: + * char *data = "bgrabgrabgra...." + * int *data = { 0xAARRGGBB, 0xAARRGGBB, 0xAARRGGBB, ... } + * + * It is possible to convert between these two formats (almost) losslessly. + * Some color information from partially transparent regions of the image + * is lost, but the result when displaying this image will remain the same. + * + * The class allows interoperation between GdkPixbuf + * and Cairo surfaces without creating a copy of the image. + * This is implemented by creating a GdkPixbuf and a Cairo image surface + * which share their data. Depending on what is needed at a given time, + * the pixels are converted in place to the Cairo or the GdkPixbuf format. + */ + +/** Create a pixbuf from a Cairo surface. + * The constructor takes ownership of the passed surface, + * so it should not be destroyed. */ +Pixbuf::Pixbuf(cairo_surface_t *s) + : _pixbuf(gdk_pixbuf_new_from_data( + cairo_image_surface_get_data(s), GDK_COLORSPACE_RGB, TRUE, 8, + cairo_image_surface_get_width(s), cairo_image_surface_get_height(s), + cairo_image_surface_get_stride(s), + ink_cairo_pixbuf_cleanup, s)) + , _surface(s) + , _mod_time(0) + , _pixel_format(PF_CAIRO) + , _cairo_store(true) +{} + +/** Create a pixbuf from a GdkPixbuf. + * The constructor takes ownership of the passed GdkPixbuf reference, + * so it should not be unrefed. */ +Pixbuf::Pixbuf(GdkPixbuf *pb) + : _pixbuf(pb) + , _surface(nullptr) + , _mod_time(0) + , _pixel_format(PF_GDK) + , _cairo_store(false) +{ + _forceAlpha(); + _surface = cairo_image_surface_create_for_data( + gdk_pixbuf_get_pixels(_pixbuf), CAIRO_FORMAT_ARGB32, + gdk_pixbuf_get_width(_pixbuf), gdk_pixbuf_get_height(_pixbuf), gdk_pixbuf_get_rowstride(_pixbuf)); +} + +Pixbuf::Pixbuf(Inkscape::Pixbuf const &other) + : _pixbuf(gdk_pixbuf_copy(other._pixbuf)) + , _surface(cairo_image_surface_create_for_data( + gdk_pixbuf_get_pixels(_pixbuf), CAIRO_FORMAT_ARGB32, + gdk_pixbuf_get_width(_pixbuf), gdk_pixbuf_get_height(_pixbuf), gdk_pixbuf_get_rowstride(_pixbuf))) + , _mod_time(other._mod_time) + , _path(other._path) + , _pixel_format(other._pixel_format) + , _cairo_store(false) +{} + +Pixbuf::~Pixbuf() +{ + if (_cairo_store) { + g_object_unref(_pixbuf); + } else { + cairo_surface_destroy(_surface); + g_object_unref(_pixbuf); + } +} + +#if !GDK_PIXBUF_CHECK_VERSION(2, 41, 0) +/** + * Incremental file read introduced to workaround + * https://gitlab.gnome.org/GNOME/gdk-pixbuf/issues/70 + */ +static bool _workaround_issue_70__gdk_pixbuf_loader_write( // + GdkPixbufLoader *loader, guchar *decoded, gsize decoded_len, GError **error) +{ + bool success = true; + gsize bytes_left = decoded_len; + gsize secret_limit = 0xffff; + guchar *decoded_head = decoded; + while (bytes_left && success) { + gsize bytes = (bytes_left > secret_limit) ? secret_limit : bytes_left; + success = gdk_pixbuf_loader_write(loader, decoded_head, bytes, error); + decoded_head += bytes; + bytes_left -= bytes; + } + + return success; +} +#define gdk_pixbuf_loader_write _workaround_issue_70__gdk_pixbuf_loader_write +#endif + +Pixbuf *Pixbuf::create_from_data_uri(gchar const *uri_data, double svgdpi) +{ + Pixbuf *pixbuf = nullptr; + + bool data_is_image = false; + bool data_is_svg = false; + bool data_is_base64 = false; + + gchar const *data = uri_data; + + while (*data) { + if (strncmp(data,"base64",6) == 0) { + /* base64-encoding */ + data_is_base64 = true; + data_is_image = true; // Illustrator produces embedded images without MIME type, so we assume it's image no matter what + data += 6; + } + else if (strncmp(data,"image/png",9) == 0) { + /* PNG image */ + data_is_image = true; + data += 9; + } + else if (strncmp(data,"image/jpg",9) == 0) { + /* JPEG image */ + data_is_image = true; + data += 9; + } + else if (strncmp(data,"image/jpeg",10) == 0) { + /* JPEG image */ + data_is_image = true; + data += 10; + } + else if (strncmp(data,"image/jp2",9) == 0) { + /* JPEG2000 image */ + data_is_image = true; + data += 9; + } + else if (strncmp(data,"image/svg+xml",13) == 0) { + /* JPEG2000 image */ + data_is_svg = true; + data_is_image = true; + data += 13; + } + else { /* unrecognized option; skip it */ + while (*data) { + if (((*data) == ';') || ((*data) == ',')) { + break; + } + data++; + } + } + if ((*data) == ';') { + data++; + continue; + } + if ((*data) == ',') { + data++; + break; + } + } + + if ((*data) && data_is_image && !data_is_svg && data_is_base64) { + GdkPixbufLoader *loader = gdk_pixbuf_loader_new(); + + if (!loader) return nullptr; + + gsize decoded_len = 0; + guchar *decoded = g_base64_decode(data, &decoded_len); + + if (gdk_pixbuf_loader_write(loader, decoded, decoded_len, nullptr)) { + gdk_pixbuf_loader_close(loader, nullptr); + GdkPixbuf *buf = gdk_pixbuf_loader_get_pixbuf(loader); + if (buf) { + g_object_ref(buf); + buf = Pixbuf::apply_embedded_orientation(buf); + pixbuf = new Pixbuf(buf); + + GdkPixbufFormat *fmt = gdk_pixbuf_loader_get_format(loader); + gchar *fmt_name = gdk_pixbuf_format_get_name(fmt); + pixbuf->_setMimeData(decoded, decoded_len, fmt_name); + g_free(fmt_name); + } else { + g_free(decoded); + } + } else { + g_free(decoded); + } + g_object_unref(loader); + } + + if ((*data) && data_is_image && data_is_svg && data_is_base64) { + gsize decoded_len = 0; + guchar *decoded = g_base64_decode(data, &decoded_len); + std::unique_ptr<SPDocument> svgDoc( + SPDocument::createNewDocFromMem(reinterpret_cast<gchar const *>(decoded), decoded_len, false)); + // Check the document loaded properly + if (svgDoc == nullptr) { + return nullptr; + } + if (svgDoc->getRoot() == nullptr) + { + return nullptr; + } + Inkscape::Preferences *prefs = Inkscape::Preferences::get(); + double dpi = prefs->getDouble("/dialogs/import/defaultxdpi/value", 96.0); + if (svgdpi && svgdpi > 0) { + dpi = svgdpi; + } + + // Get the size of the document + Inkscape::Util::Quantity svgWidth = svgDoc->getWidth(); + Inkscape::Util::Quantity svgHeight = svgDoc->getHeight(); + const double svgWidth_px = svgWidth.value("px"); + const double svgHeight_px = svgHeight.value("px"); + if (svgWidth_px < 0 || svgHeight_px < 0) { + g_warning("create_from_data_uri: malformed document: svgWidth_px=%f, svgHeight_px=%f", svgWidth_px, + svgHeight_px); + return nullptr; + } + + assert(!pixbuf); + Geom::Rect area(0, 0, svgWidth_px, svgHeight_px); + pixbuf = sp_generate_internal_bitmap(svgDoc.get(), area, dpi); + GdkPixbuf const *buf = pixbuf->getPixbufRaw(); + + // Tidy up + if (buf == nullptr) { + std::cerr << "Pixbuf::create_from_data: failed to load contents: " << std::endl; + delete pixbuf; + g_free(decoded); + return nullptr; + } else { + pixbuf->_setMimeData(decoded, decoded_len, "svg+xml"); + } + } + + return pixbuf; +} + +Pixbuf *Pixbuf::create_from_file(std::string const &fn, double svgdpi) +{ + Pixbuf *pb = nullptr; + // test correctness of filename + if (!g_file_test(fn.c_str(), G_FILE_TEST_EXISTS)) { + return nullptr; + } + GStatBuf stdir; + int val = g_stat(fn.c_str(), &stdir); + if (val == 0 && stdir.st_mode & S_IFDIR){ + return nullptr; + } + // we need to load the entire file into memory, + // since we'll store it as MIME data + gchar *data = nullptr; + gsize len = 0; + GError *error = nullptr; + + if (g_file_get_contents(fn.c_str(), &data, &len, &error)) { + + if (error != nullptr) { + std::cerr << "Pixbuf::create_from_file: " << error->message << std::endl; + std::cerr << " (" << fn << ")" << std::endl; + return nullptr; + } + + pb = Pixbuf::create_from_buffer(std::move(data), len, svgdpi, fn); + + if (pb) { + pb->_mod_time = stdir.st_mtime; + } + } else { + std::cerr << "Pixbuf::create_from_file: failed to get contents: " << fn << std::endl; + return nullptr; + } + + return pb; +} + +GdkPixbuf *Pixbuf::apply_embedded_orientation(GdkPixbuf *buf) +{ + GdkPixbuf *old = buf; + buf = gdk_pixbuf_apply_embedded_orientation(buf); + g_object_unref(old); + return buf; +} + +Pixbuf *Pixbuf::create_from_buffer(std::string const &buffer, double svgdpi, std::string const &fn) +{ +#if GLIB_CHECK_VERSION(2,67,3) + auto datacopy = (gchar *)g_memdup2(buffer.data(), buffer.size()); +#else + auto datacopy = (gchar *)g_memdup(buffer.data(), buffer.size()); +#endif + return Pixbuf::create_from_buffer(std::move(datacopy), buffer.size(), svgdpi, fn); +} + +Pixbuf *Pixbuf::create_from_buffer(gchar *&&data, gsize len, double svgdpi, std::string const &fn) +{ + Pixbuf *pb = nullptr; + GError *error = nullptr; + { + GdkPixbuf *buf = nullptr; + GdkPixbufLoader *loader = nullptr; + std::string::size_type idx; + idx = fn.rfind('.'); + bool is_svg = false; + if(idx != std::string::npos) + { + if (boost::iequals(fn.substr(idx+1).c_str(), "svg")) { + + std::unique_ptr<SPDocument> svgDoc(SPDocument::createNewDocFromMem(data, len, true)); + + // Check the document loaded properly + if (svgDoc == nullptr) { + return nullptr; + } + if (svgDoc->getRoot() == nullptr) + { + return nullptr; + } + + Inkscape::Preferences *prefs = Inkscape::Preferences::get(); + double dpi = prefs->getDouble("/dialogs/import/defaultxdpi/value", 96.0); + if (svgdpi && svgdpi > 0) { + dpi = svgdpi; + } + + // Get the size of the document + Inkscape::Util::Quantity svgWidth = svgDoc->getWidth(); + Inkscape::Util::Quantity svgHeight = svgDoc->getHeight(); + const double svgWidth_px = svgWidth.value("px"); + const double svgHeight_px = svgHeight.value("px"); + if (svgWidth_px < 0 || svgHeight_px < 0) { + g_warning("create_from_buffer: malformed document: svgWidth_px=%f, svgHeight_px=%f", svgWidth_px, + svgHeight_px); + return nullptr; + } + + Geom::Rect area(0, 0, svgWidth_px, svgHeight_px); + pb = sp_generate_internal_bitmap(svgDoc.get(), area, dpi); + buf = pb->getPixbufRaw(); + + // Tidy up + if (buf == nullptr) { + delete pb; + return nullptr; + } + buf = Pixbuf::apply_embedded_orientation(buf); + is_svg = true; + } + } + if (!is_svg) { + loader = gdk_pixbuf_loader_new(); + gdk_pixbuf_loader_write(loader, (guchar *) data, len, &error); + if (error != nullptr) { + std::cerr << "Pixbuf::create_from_file: " << error->message << std::endl; + std::cerr << " (" << fn << ")" << std::endl; + g_free(data); + g_object_unref(loader); + return nullptr; + } + + gdk_pixbuf_loader_close(loader, &error); + if (error != nullptr) { + std::cerr << "Pixbuf::create_from_file: " << error->message << std::endl; + std::cerr << " (" << fn << ")" << std::endl; + g_free(data); + g_object_unref(loader); + return nullptr; + } + + buf = gdk_pixbuf_loader_get_pixbuf(loader); + if (buf) { + // gdk_pixbuf_loader_get_pixbuf returns a borrowed reference + g_object_ref(buf); + buf = Pixbuf::apply_embedded_orientation(buf); + pb = new Pixbuf(buf); + } + } + + if (pb) { + pb->_path = fn; + if (!is_svg) { + GdkPixbufFormat *fmt = gdk_pixbuf_loader_get_format(loader); + gchar *fmt_name = gdk_pixbuf_format_get_name(fmt); + pb->_setMimeData((guchar *) data, len, fmt_name); + g_free(fmt_name); + g_object_unref(loader); + } else { + pb->_setMimeData((guchar *) data, len, "svg"); + } + } else { + std::cerr << "Pixbuf::create_from_file: failed to load contents: " << fn << std::endl; + g_free(data); + } + + // TODO: we could also read DPI, ICC profile, gamma correction, and other information + // from the file. This can be done by using format-specific libraries e.g. libpng. + } + + return pb; +} + +/** + * Converts the pixbuf to GdkPixbuf pixel format. + * The returned pixbuf can be used e.g. in calls to gdk_pixbuf_save(). + */ +GdkPixbuf *Pixbuf::getPixbufRaw(bool convert_format) +{ + if (convert_format) { + ensurePixelFormat(PF_GDK); + } + return _pixbuf; +} + +/** + * Converts the pixbuf to Cairo pixel format and returns an image surface + * which can be used as a source. + * + * The returned surface is owned by the GdkPixbuf and should not be freed. + * Calling this function causes the pixbuf to be unsuitable for use + * with GTK drawing functions until ensurePixelFormat(Pixbuf::PIXEL_FORMAT_PIXBUF) is called. + */ +cairo_surface_t *Pixbuf::getSurfaceRaw(bool convert_format) +{ + if (convert_format) { + ensurePixelFormat(PF_CAIRO); + } + return _surface; +} + +/* Declaring this function in the header requires including <gdkmm/pixbuf.h>, + * which stupidly includes <glibmm.h> which in turn pulls in <glibmm/threads.h>. + * However, since glib 2.32, <glibmm/threads.h> has to be included before <glib.h> + * when compiling with G_DISABLE_DEPRECATED, as we do in non-release builds. + * This necessitates spamming a lot of files with #include <glibmm/threads.h> + * at the top. + * + * Since we don't really use gdkmm, do not define this function for now. */ + +/* +Glib::RefPtr<Gdk::Pixbuf> Pixbuf::getPixbuf(bool convert_format = true) +{ + g_object_ref(_pixbuf); + Glib::RefPtr<Gdk::Pixbuf> p(getPixbuf(convert_format)); + return p; +} +*/ + +Cairo::RefPtr<Cairo::Surface> Pixbuf::getSurface(bool convert_format) +{ + Cairo::RefPtr<Cairo::Surface> p(new Cairo::Surface(getSurfaceRaw(convert_format), false)); + return p; +} + +/** Retrieves the original compressed data for the surface, if any. + * The returned data belongs to the object and should not be freed. */ +guchar const *Pixbuf::getMimeData(gsize &len, std::string &mimetype) const +{ + static gchar const *mimetypes[] = { + CAIRO_MIME_TYPE_JPEG, CAIRO_MIME_TYPE_JP2, CAIRO_MIME_TYPE_PNG, nullptr }; + static guint mimetypes_len = g_strv_length(const_cast<gchar**>(mimetypes)); + + guchar const *data = nullptr; + + for (guint i = 0; i < mimetypes_len; ++i) { + unsigned long len_long = 0; + cairo_surface_get_mime_data(const_cast<cairo_surface_t*>(_surface), mimetypes[i], &data, &len_long); + if (data != nullptr) { + len = len_long; + mimetype = mimetypes[i]; + break; + } + } + + return data; +} + +int Pixbuf::width() const { + return gdk_pixbuf_get_width(const_cast<GdkPixbuf*>(_pixbuf)); +} +int Pixbuf::height() const { + return gdk_pixbuf_get_height(const_cast<GdkPixbuf*>(_pixbuf)); +} +int Pixbuf::rowstride() const { + return gdk_pixbuf_get_rowstride(const_cast<GdkPixbuf*>(_pixbuf)); +} +guchar const *Pixbuf::pixels() const { + return gdk_pixbuf_get_pixels(const_cast<GdkPixbuf*>(_pixbuf)); +} +guchar *Pixbuf::pixels() { + return gdk_pixbuf_get_pixels(_pixbuf); +} +void Pixbuf::markDirty() { + cairo_surface_mark_dirty(_surface); +} + +void Pixbuf::_forceAlpha() +{ + if (gdk_pixbuf_get_has_alpha(_pixbuf)) return; + + GdkPixbuf *old = _pixbuf; + _pixbuf = gdk_pixbuf_add_alpha(old, FALSE, 0, 0, 0); + g_object_unref(old); +} + +void Pixbuf::_setMimeData(guchar *data, gsize len, Glib::ustring const &format) +{ + gchar const *mimetype = nullptr; + + if (format == "jpeg") { + mimetype = CAIRO_MIME_TYPE_JPEG; + } else if (format == "jpeg2000") { + mimetype = CAIRO_MIME_TYPE_JP2; + } else if (format == "png") { + mimetype = CAIRO_MIME_TYPE_PNG; + } + + if (mimetype != nullptr) { + cairo_surface_set_mime_data(_surface, mimetype, data, len, g_free, data); + //g_message("Setting Cairo MIME data: %s", mimetype); + } else { + g_free(data); + //g_message("Not setting Cairo MIME data: unknown format %s", name.c_str()); + } +} + +void Pixbuf::ensurePixelFormat(PixelFormat fmt) +{ + if (_pixel_format == PF_GDK) { + if (fmt == PF_GDK) { + return; + } + if (fmt == PF_CAIRO) { + convert_pixels_pixbuf_to_argb32( + gdk_pixbuf_get_pixels(_pixbuf), + gdk_pixbuf_get_width(_pixbuf), + gdk_pixbuf_get_height(_pixbuf), + gdk_pixbuf_get_rowstride(_pixbuf)); + _pixel_format = fmt; + return; + } + g_assert_not_reached(); + } + if (_pixel_format == PF_CAIRO) { + if (fmt == PF_GDK) { + convert_pixels_argb32_to_pixbuf( + gdk_pixbuf_get_pixels(_pixbuf), + gdk_pixbuf_get_width(_pixbuf), + gdk_pixbuf_get_height(_pixbuf), + gdk_pixbuf_get_rowstride(_pixbuf)); + _pixel_format = fmt; + return; + } + if (fmt == PF_CAIRO) { + return; + } + g_assert_not_reached(); + } + g_assert_not_reached(); +} + +} // namespace Inkscape + +/* + * Can be called recursively. + * If optimize_stroke == false, the view Rect is not used. + */ +static void +feed_curve_to_cairo(cairo_t *cr, Geom::Curve const &c, Geom::Affine const & trans, Geom::Rect view, bool optimize_stroke) +{ + using Geom::X; + using Geom::Y; + + unsigned order = 0; + if (Geom::BezierCurve const* b = dynamic_cast<Geom::BezierCurve const*>(&c)) { + order = b->order(); + } + + // handle the three typical curve cases + switch (order) { + case 1: + { + Geom::Point end_tr = c.finalPoint() * trans; + if (!optimize_stroke) { + cairo_line_to(cr, end_tr[0], end_tr[1]); + } else { + Geom::Rect swept(c.initialPoint()*trans, end_tr); + if (swept.intersects(view)) { + cairo_line_to(cr, end_tr[0], end_tr[1]); + } else { + cairo_move_to(cr, end_tr[0], end_tr[1]); + } + } + } + break; + case 2: + { + Geom::QuadraticBezier const *quadratic_bezier = static_cast<Geom::QuadraticBezier const*>(&c); + std::vector<Geom::Point> points = quadratic_bezier->controlPoints(); + points[0] *= trans; + points[1] *= trans; + points[2] *= trans; + // degree-elevate to cubic Bezier, since Cairo doesn't do quadratic Beziers + Geom::Point b1 = points[0] + (2./3) * (points[1] - points[0]); + Geom::Point b2 = b1 + (1./3) * (points[2] - points[0]); + if (!optimize_stroke) { + cairo_curve_to(cr, b1[X], b1[Y], b2[X], b2[Y], points[2][X], points[2][Y]); + } else { + Geom::Rect swept(points[0], points[2]); + swept.expandTo(points[1]); + if (swept.intersects(view)) { + cairo_curve_to(cr, b1[X], b1[Y], b2[X], b2[Y], points[2][X], points[2][Y]); + } else { + cairo_move_to(cr, points[2][X], points[2][Y]); + } + } + } + break; + case 3: + { + Geom::CubicBezier const *cubic_bezier = static_cast<Geom::CubicBezier const*>(&c); + std::vector<Geom::Point> points = cubic_bezier->controlPoints(); + //points[0] *= trans; // don't do this one here for fun: it is only needed for optimized strokes + points[1] *= trans; + points[2] *= trans; + points[3] *= trans; + if (!optimize_stroke) { + cairo_curve_to(cr, points[1][X], points[1][Y], points[2][X], points[2][Y], points[3][X], points[3][Y]); + } else { + points[0] *= trans; // didn't transform this point yet + Geom::Rect swept(points[0], points[3]); + swept.expandTo(points[1]); + swept.expandTo(points[2]); + if (swept.intersects(view)) { + cairo_curve_to(cr, points[1][X], points[1][Y], points[2][X], points[2][Y], points[3][X], points[3][Y]); + } else { + cairo_move_to(cr, points[3][X], points[3][Y]); + } + } + } + break; + default: + { + if (Geom::EllipticalArc const *arc = dynamic_cast<Geom::EllipticalArc const*>(&c)) { + if (arc->isChord()) { + Geom::Point endPoint(arc->finalPoint()); + cairo_line_to(cr, endPoint[0], endPoint[1]); + } else { + Geom::Affine xform = arc->unitCircleTransform() * trans; + // Don't draw anything if the angle is borked + if(std::isnan(arc->initialAngle()) || std::isnan(arc->finalAngle())) { + g_warning("Bad angle while drawing EllipticalArc"); + break; + } + + // Apply the transformation to the current context + cairo_matrix_t cm; + cm.xx = xform[0]; + cm.xy = xform[2]; + cm.x0 = xform[4]; + cm.yx = xform[1]; + cm.yy = xform[3]; + cm.y0 = xform[5]; + + cairo_save(cr); + cairo_transform(cr, &cm); + + // Draw the circle + if (arc->sweep()) { + cairo_arc(cr, 0, 0, 1, arc->initialAngle(), arc->finalAngle()); + } else { + cairo_arc_negative(cr, 0, 0, 1, arc->initialAngle(), arc->finalAngle()); + } + // Revert the current context + cairo_restore(cr); + } + } else { + // handles sbasis as well as all other curve types + // this is very slow + Geom::Path sbasis_path = Geom::cubicbezierpath_from_sbasis(c.toSBasis(), 0.1); + + // recurse to convert the new path resulting from the sbasis to svgd + for (const auto & iter : sbasis_path) { + feed_curve_to_cairo(cr, iter, trans, view, optimize_stroke); + } + } + } + break; + } +} + + +/** Feeds path-creating calls to the cairo context translating them from the Path */ +static void +feed_path_to_cairo (cairo_t *ct, Geom::Path const &path) +{ + if (path.empty()) + return; + + cairo_move_to(ct, path.initialPoint()[0], path.initialPoint()[1] ); + + for (Geom::Path::const_iterator cit = path.begin(); cit != path.end_open(); ++cit) { + feed_curve_to_cairo(ct, *cit, Geom::identity(), Geom::Rect(), false); // optimize_stroke is false, so the view rect is not used + } + + if (path.closed()) { + cairo_close_path(ct); + } +} + +/** Feeds path-creating calls to the cairo context translating them from the Path, with the given transform and shift */ +static void +feed_path_to_cairo (cairo_t *ct, Geom::Path const &path, Geom::Affine trans, Geom::OptRect area, bool optimize_stroke, double stroke_width) +{ + if (!area) + return; + if (path.empty()) + return; + + // Transform all coordinates to coords within "area" + Geom::Point shift = area->min(); + Geom::Rect view = *area; + view.expandBy (stroke_width); + view = view * (Geom::Affine)Geom::Translate(-shift); + // Pass transformation to feed_curve, so that we don't need to create a whole new path. + Geom::Affine transshift(trans * Geom::Translate(-shift)); + + Geom::Point initial = path.initialPoint() * transshift; + cairo_move_to(ct, initial[0], initial[1] ); + + for(Geom::Path::const_iterator cit = path.begin(); cit != path.end_open(); ++cit) { + feed_curve_to_cairo(ct, *cit, transshift, view, optimize_stroke); + } + + if (path.closed()) { + if (!optimize_stroke) { + cairo_close_path(ct); + } else { + cairo_line_to(ct, initial[0], initial[1]); + /* We cannot use cairo_close_path(ct) here because some parts of the path may have been + clipped and not drawn (maybe the before last segment was outside view area), which + would result in closing the "subpath" after the last interruption, not the entire path. + + However, according to cairo documentation: + The behavior of cairo_close_path() is distinct from simply calling cairo_line_to() with the equivalent coordinate + in the case of stroking. When a closed sub-path is stroked, there are no caps on the ends of the sub-path. Instead, + there is a line join connecting the final and initial segments of the sub-path. + + The correct fix will be possible when cairo introduces methods for moving without + ending/starting subpaths, which we will use for skipping invisible segments; then we + will be able to use cairo_close_path here. This issue also affects ps/eps/pdf export, + see bug 168129 + */ + } + } +} + +/** Feeds path-creating calls to the cairo context translating them from the PathVector, with the given transform and shift + * One must have done cairo_new_path(ct); before calling this function. */ +void +feed_pathvector_to_cairo (cairo_t *ct, Geom::PathVector const &pathv, Geom::Affine trans, Geom::OptRect area, bool optimize_stroke, double stroke_width) +{ + if (!area) + return; + if (pathv.empty()) + return; + + for(const auto & it : pathv) { + feed_path_to_cairo(ct, it, trans, area, optimize_stroke, stroke_width); + } +} + +/** Feeds path-creating calls to the cairo context translating them from the PathVector + * One must have done cairo_new_path(ct); before calling this function. */ +void +feed_pathvector_to_cairo (cairo_t *ct, Geom::PathVector const &pathv) +{ + if (pathv.empty()) + return; + + for(const auto & it : pathv) { + feed_path_to_cairo(ct, it); + } +} + +SPColorInterpolation +get_cairo_surface_ci(cairo_surface_t *surface) { + void* data = cairo_surface_get_user_data( surface, &ink_color_interpolation_key ); + if( data != nullptr ) { + return (SPColorInterpolation)GPOINTER_TO_INT( data ); + } else { + return SP_CSS_COLOR_INTERPOLATION_AUTO; + } +} + +/** Set the color_interpolation_value for a Cairo surface. + * Transform the surface between sRGB and linearRGB if necessary. */ +void +set_cairo_surface_ci(cairo_surface_t *surface, SPColorInterpolation ci) { + + if( cairo_surface_get_content( surface ) != CAIRO_CONTENT_ALPHA ) { + + SPColorInterpolation ci_in = get_cairo_surface_ci( surface ); + + if( ci_in == SP_CSS_COLOR_INTERPOLATION_SRGB && + ci == SP_CSS_COLOR_INTERPOLATION_LINEARRGB ) { + ink_cairo_surface_srgb_to_linear( surface ); + } + if( ci_in == SP_CSS_COLOR_INTERPOLATION_LINEARRGB && + ci == SP_CSS_COLOR_INTERPOLATION_SRGB ) { + ink_cairo_surface_linear_to_srgb( surface ); + } + + cairo_surface_set_user_data(surface, &ink_color_interpolation_key, GINT_TO_POINTER (ci), nullptr); + } +} + +void +copy_cairo_surface_ci(cairo_surface_t *in, cairo_surface_t *out) { + cairo_surface_set_user_data(out, &ink_color_interpolation_key, cairo_surface_get_user_data(in, &ink_color_interpolation_key), nullptr); +} + +void +ink_cairo_set_source_rgba32(cairo_t *ct, guint32 rgba) +{ + cairo_set_source_rgba(ct, SP_RGBA32_R_F(rgba), SP_RGBA32_G_F(rgba), SP_RGBA32_B_F(rgba), SP_RGBA32_A_F(rgba)); +} + +void +ink_cairo_set_source_color(cairo_t *ct, SPColor const &c, double opacity) +{ + cairo_set_source_rgba(ct, c.v.c[0], c.v.c[1], c.v.c[2], opacity); +} + +void ink_matrix_to_2geom(Geom::Affine &m, cairo_matrix_t const &cm) +{ + m[0] = cm.xx; + m[2] = cm.xy; + m[4] = cm.x0; + m[1] = cm.yx; + m[3] = cm.yy; + m[5] = cm.y0; +} + +void ink_matrix_to_cairo(cairo_matrix_t &cm, Geom::Affine const &m) +{ + cm.xx = m[0]; + cm.xy = m[2]; + cm.x0 = m[4]; + cm.yx = m[1]; + cm.yy = m[3]; + cm.y0 = m[5]; +} + +void +ink_cairo_transform(cairo_t *ct, Geom::Affine const &m) +{ + cairo_matrix_t cm; + ink_matrix_to_cairo(cm, m); + cairo_transform(ct, &cm); +} + +void +ink_cairo_pattern_set_matrix(cairo_pattern_t *cp, Geom::Affine const &m) +{ + cairo_matrix_t cm; + ink_matrix_to_cairo(cm, m); + cairo_pattern_set_matrix(cp, &cm); +} + +void +ink_cairo_set_hairline(cairo_t *ct) +{ +#ifdef CAIRO_HAS_HAIRLINE + cairo_set_hairline(ct); +#else + // As a backup, use a device unit of 1 + double x = 1, y = 1; + cairo_device_to_user_distance(ct, &x, &y); + cairo_set_line_width(ct, std::min(x, y)); +#endif +} + +/** + * Create an exact copy of a surface. + * Creates a surface that has the same type, content type, dimensions and contents + * as the specified surface. + */ +cairo_surface_t * +ink_cairo_surface_copy(cairo_surface_t *s) +{ + cairo_surface_t *ns = ink_cairo_surface_create_identical(s); + + if (cairo_surface_get_type(s) == CAIRO_SURFACE_TYPE_IMAGE) { + // use memory copy instead of using a Cairo context + cairo_surface_flush(s); + int stride = cairo_image_surface_get_stride(s); + int h = cairo_image_surface_get_height(s); + memcpy(cairo_image_surface_get_data(ns), cairo_image_surface_get_data(s), stride * h); + cairo_surface_mark_dirty(ns); + } else { + // generic implementation + cairo_t *ct = cairo_create(ns); + cairo_set_source_surface(ct, s, 0, 0); + cairo_set_operator(ct, CAIRO_OPERATOR_SOURCE); + cairo_paint(ct); + cairo_destroy(ct); + } + + return ns; +} + +/** + * Create an exact copy of an image surface. + */ +Cairo::RefPtr<Cairo::ImageSurface> +ink_cairo_surface_copy(Cairo::RefPtr<Cairo::ImageSurface> surface ) +{ + int width = surface->get_width(); + int height = surface->get_height(); + int stride = surface->get_stride(); + auto new_surface = Cairo::ImageSurface::create(Cairo::FORMAT_ARGB32, width, height); // device scale? + + surface->flush(); + memcpy(new_surface->get_data(), surface->get_data(), stride * height); + new_surface->mark_dirty(); // Clear caches. Mandatory after messing directly with contents. + + return new_surface; +} + +/** + * Create a surface that differs only in pixel content. + * Creates a surface that has the same type, content type and dimensions + * as the specified surface. Pixel contents are not copied. + */ +cairo_surface_t * +ink_cairo_surface_create_identical(cairo_surface_t *s) +{ + cairo_surface_t *ns = ink_cairo_surface_create_same_size(s, cairo_surface_get_content(s)); + cairo_surface_set_user_data(ns, &ink_color_interpolation_key, cairo_surface_get_user_data(s, &ink_color_interpolation_key), nullptr); + return ns; +} + +cairo_surface_t * +ink_cairo_surface_create_same_size(cairo_surface_t *s, cairo_content_t c) +{ + // ink_cairo_surface_get_width()/height() returns value in pixels + // cairo_surface_create_similar() uses device units + double x_scale = 0; + double y_scale = 0; + cairo_surface_get_device_scale( s, &x_scale, &y_scale ); + + assert (x_scale > 0); + assert (y_scale > 0); + + cairo_surface_t *ns = + cairo_surface_create_similar(s, c, + ink_cairo_surface_get_width(s)/x_scale, + ink_cairo_surface_get_height(s)/y_scale); + return ns; +} + +/** + * Extract the alpha channel into a new surface. + * Creates a surface with a content type of CAIRO_CONTENT_ALPHA that contains + * the alpha values of pixels from @a s. + */ +cairo_surface_t * +ink_cairo_extract_alpha(cairo_surface_t *s) +{ + cairo_surface_t *alpha = ink_cairo_surface_create_same_size(s, CAIRO_CONTENT_ALPHA); + + cairo_t *ct = cairo_create(alpha); + cairo_set_source_surface(ct, s, 0, 0); + cairo_set_operator(ct, CAIRO_OPERATOR_SOURCE); + cairo_paint(ct); + cairo_destroy(ct); + + return alpha; +} + +cairo_surface_t * +ink_cairo_surface_create_output(cairo_surface_t *image, cairo_surface_t *bg) +{ + cairo_content_t imgt = cairo_surface_get_content(image); + cairo_content_t bgt = cairo_surface_get_content(bg); + cairo_surface_t *out = nullptr; + + if (bgt == CAIRO_CONTENT_ALPHA && imgt == CAIRO_CONTENT_ALPHA) { + out = ink_cairo_surface_create_identical(bg); + } else { + out = ink_cairo_surface_create_same_size(bg, CAIRO_CONTENT_COLOR_ALPHA); + } + + return out; +} + +void +ink_cairo_surface_blit(cairo_surface_t *src, cairo_surface_t *dest) +{ + if (cairo_surface_get_type(src) == CAIRO_SURFACE_TYPE_IMAGE && + cairo_surface_get_type(dest) == CAIRO_SURFACE_TYPE_IMAGE && + cairo_image_surface_get_format(src) == cairo_image_surface_get_format(dest) && + cairo_image_surface_get_height(src) == cairo_image_surface_get_height(dest) && + cairo_image_surface_get_width(src) == cairo_image_surface_get_width(dest) && + cairo_image_surface_get_stride(src) == cairo_image_surface_get_stride(dest)) + { + // use memory copy instead of using a Cairo context + cairo_surface_flush(src); + int stride = cairo_image_surface_get_stride(src); + int h = cairo_image_surface_get_height(src); + memcpy(cairo_image_surface_get_data(dest), cairo_image_surface_get_data(src), stride * h); + cairo_surface_mark_dirty(dest); + } else { + // generic implementation + cairo_t *ct = cairo_create(dest); + cairo_set_source_surface(ct, src, 0, 0); + cairo_set_operator(ct, CAIRO_OPERATOR_SOURCE); + cairo_paint(ct); + cairo_destroy(ct); + } +} + +/** + * Return width in pixels. + */ +int +ink_cairo_surface_get_width(cairo_surface_t *surface) +{ + // For now only image surface is handled. + // Later add others, e.g. cairo-gl + assert(cairo_surface_get_type(surface) == CAIRO_SURFACE_TYPE_IMAGE); + return cairo_image_surface_get_width(surface); +} + +/** + * Return height in pixels. + */ +int +ink_cairo_surface_get_height(cairo_surface_t *surface) +{ + assert(cairo_surface_get_type(surface) == CAIRO_SURFACE_TYPE_IMAGE); + return cairo_image_surface_get_height(surface); +} + +static int ink_cairo_surface_average_color_internal(cairo_surface_t *surface, double &rf, double &gf, double &bf, double &af) +{ + rf = gf = bf = af = 0.0; + cairo_surface_flush(surface); + int width = cairo_image_surface_get_width(surface); + int height = cairo_image_surface_get_height(surface); + int stride = cairo_image_surface_get_stride(surface); + unsigned char *data = cairo_image_surface_get_data(surface); + + /* TODO convert this to OpenMP somehow */ + for (int y = 0; y < height; ++y, data += stride) { + for (int x = 0; x < width; ++x) { + guint32 px = *reinterpret_cast<guint32*>(data + 4*x); + EXTRACT_ARGB32(px, a,r,g,b) + rf += r / 255.0; + gf += g / 255.0; + bf += b / 255.0; + af += a / 255.0; + } + } + return width * height; +} + +guint32 ink_cairo_surface_average_color(cairo_surface_t *surface) +{ + double rf,gf,bf,af; + ink_cairo_surface_average_color_premul(surface, rf,gf,bf,af); + guint32 r = round(rf * 255); + guint32 g = round(gf * 255); + guint32 b = round(bf * 255); + guint32 a = round(af * 255); + ASSEMBLE_ARGB32(px, a,r,g,b); + return px; +} +// We extract colors from pattern background, if we need to extract sometimes from a gradient we can add +// a extra parameter with the spot number and use cairo_pattern_get_color_stop_rgba +// also if the pattern is a image we can pass a boolean like solid = false to get the color by image average ink_cairo_surface_average_color +guint32 ink_cairo_pattern_get_argb32(cairo_pattern_t *pattern) +{ + double red = 0; + double green = 0; + double blue = 0; + double alpha = 0; + auto status = cairo_pattern_get_rgba(pattern, &red, &green, &blue, &alpha); + if (status != CAIRO_STATUS_PATTERN_TYPE_MISMATCH) { + // in ARGB32 format + return SP_RGBA32_F_COMPOSE(alpha, red, green, blue); + } + + cairo_surface_t *surface; + status = cairo_pattern_get_surface (pattern, &surface); + if (status != CAIRO_STATUS_PATTERN_TYPE_MISMATCH) { + // first pixel only + auto *pxbsurface = cairo_image_surface_get_data(surface); + return *reinterpret_cast<guint32 const *>(pxbsurface); + } + return 0; +} + +void ink_cairo_surface_average_color(cairo_surface_t *surface, double &r, double &g, double &b, double &a) +{ + int count = ink_cairo_surface_average_color_internal(surface, r,g,b,a); + + r /= a; + g /= a; + b /= a; + a /= count; + + r = CLAMP(r, 0.0, 1.0); + g = CLAMP(g, 0.0, 1.0); + b = CLAMP(b, 0.0, 1.0); + a = CLAMP(a, 0.0, 1.0); +} + +void ink_cairo_surface_average_color_premul(cairo_surface_t *surface, double &r, double &g, double &b, double &a) +{ + int count = ink_cairo_surface_average_color_internal(surface, r,g,b,a); + + r /= count; + g /= count; + b /= count; + a /= count; + + r = CLAMP(r, 0.0, 1.0); + g = CLAMP(g, 0.0, 1.0); + b = CLAMP(b, 0.0, 1.0); + a = CLAMP(a, 0.0, 1.0); +} + +static guint32 srgb_to_linear( const guint32 c, const guint32 a ) { + + const guint32 c1 = unpremul_alpha( c, a ); + + double cc = c1/255.0; + + if( cc < 0.04045 ) { + cc /= 12.92; + } else { + cc = pow( (cc+0.055)/1.055, 2.4 ); + } + cc *= 255.0; + + const guint32 c2 = (int)cc; + + return premul_alpha( c2, a ); +} + +static guint32 linear_to_srgb( const guint32 c, const guint32 a ) { + + const guint32 c1 = unpremul_alpha( c, a ); + + double cc = c1/255.0; + + if( cc < 0.0031308 ) { + cc *= 12.92; + } else { + cc = pow( cc, 1.0/2.4 )*1.055-0.055; + } + cc *= 255.0; + + const guint32 c2 = (int)cc; + + return premul_alpha( c2, a ); +} + +struct SurfaceSrgbToLinear { + + guint32 operator()(guint32 in) { + EXTRACT_ARGB32(in, a,r,g,b) ; // Unneeded semi-colon for indenting + if( a != 0 ) { + r = srgb_to_linear( r, a ); + g = srgb_to_linear( g, a ); + b = srgb_to_linear( b, a ); + } + ASSEMBLE_ARGB32(out, a,r,g,b); + return out; + } +private: + /* None */ +}; + +int ink_cairo_surface_srgb_to_linear(cairo_surface_t *surface) +{ + cairo_surface_flush(surface); + int width = cairo_image_surface_get_width(surface); + int height = cairo_image_surface_get_height(surface); + // int stride = cairo_image_surface_get_stride(surface); + // unsigned char *data = cairo_image_surface_get_data(surface); + + ink_cairo_surface_filter( surface, surface, SurfaceSrgbToLinear() ); + + /* TODO convert this to OpenMP somehow */ + // for (int y = 0; y < height; ++y, data += stride) { + // for (int x = 0; x < width; ++x) { + // guint32 px = *reinterpret_cast<guint32*>(data + 4*x); + // EXTRACT_ARGB32(px, a,r,g,b) ; // Unneeded semi-colon for indenting + // if( a != 0 ) { + // r = srgb_to_linear( r, a ); + // g = srgb_to_linear( g, a ); + // b = srgb_to_linear( b, a ); + // } + // ASSEMBLE_ARGB32(px2, a,r,g,b); + // *reinterpret_cast<guint32*>(data + 4*x) = px2; + // } + // } + return width * height; +} + +struct SurfaceLinearToSrgb { + + guint32 operator()(guint32 in) { + EXTRACT_ARGB32(in, a,r,g,b) ; // Unneeded semi-colon for indenting + if( a != 0 ) { + r = linear_to_srgb( r, a ); + g = linear_to_srgb( g, a ); + b = linear_to_srgb( b, a ); + } + ASSEMBLE_ARGB32(out, a,r,g,b); + return out; + } +private: + /* None */ +}; + +SPBlendMode ink_cairo_operator_to_css_blend(cairo_operator_t cairo_operator) +{ + // All of the blend modes are implemented in Cairo as of 1.10. + // For a detailed description, see: + // http://cairographics.org/operators/ + auto res = SP_CSS_BLEND_NORMAL; + switch (cairo_operator) { + case CAIRO_OPERATOR_MULTIPLY: + res = SP_CSS_BLEND_MULTIPLY; + break; + case CAIRO_OPERATOR_SCREEN: + res = SP_CSS_BLEND_SCREEN; + break; + case CAIRO_OPERATOR_DARKEN: + res = SP_CSS_BLEND_DARKEN; + break; + case CAIRO_OPERATOR_LIGHTEN: + res = SP_CSS_BLEND_LIGHTEN; + break; + case CAIRO_OPERATOR_OVERLAY: + res = SP_CSS_BLEND_OVERLAY; + break; + case CAIRO_OPERATOR_COLOR_DODGE: + res = SP_CSS_BLEND_COLORDODGE; + break; + case CAIRO_OPERATOR_COLOR_BURN: + res = SP_CSS_BLEND_COLORBURN; + break; + case CAIRO_OPERATOR_HARD_LIGHT: + res = SP_CSS_BLEND_HARDLIGHT; + break; + case CAIRO_OPERATOR_SOFT_LIGHT: + res = SP_CSS_BLEND_SOFTLIGHT; + break; + case CAIRO_OPERATOR_DIFFERENCE: + res = SP_CSS_BLEND_DIFFERENCE; + break; + case CAIRO_OPERATOR_EXCLUSION: + res = SP_CSS_BLEND_EXCLUSION; + break; + case CAIRO_OPERATOR_HSL_HUE: + res = SP_CSS_BLEND_HUE; + break; + case CAIRO_OPERATOR_HSL_SATURATION: + res = SP_CSS_BLEND_SATURATION; + break; + case CAIRO_OPERATOR_HSL_COLOR: + res = SP_CSS_BLEND_COLOR; + break; + case CAIRO_OPERATOR_HSL_LUMINOSITY: + res = SP_CSS_BLEND_LUMINOSITY; + break; + case CAIRO_OPERATOR_OVER: + default: + res = SP_CSS_BLEND_NORMAL; + break; + } + return res; +} + +cairo_operator_t ink_css_blend_to_cairo_operator(SPBlendMode css_blend) +{ + // All of the blend modes are implemented in Cairo as of 1.10. + // For a detailed description, see: + // http://cairographics.org/operators/ + + cairo_operator_t res = CAIRO_OPERATOR_OVER; + switch (css_blend) { + case SP_CSS_BLEND_MULTIPLY: + res = CAIRO_OPERATOR_MULTIPLY; + break; + case SP_CSS_BLEND_SCREEN: + res = CAIRO_OPERATOR_SCREEN; + break; + case SP_CSS_BLEND_DARKEN: + res = CAIRO_OPERATOR_DARKEN; + break; + case SP_CSS_BLEND_LIGHTEN: + res = CAIRO_OPERATOR_LIGHTEN; + break; + case SP_CSS_BLEND_OVERLAY: + res = CAIRO_OPERATOR_OVERLAY; + break; + case SP_CSS_BLEND_COLORDODGE: + res = CAIRO_OPERATOR_COLOR_DODGE; + break; + case SP_CSS_BLEND_COLORBURN: + res = CAIRO_OPERATOR_COLOR_BURN; + break; + case SP_CSS_BLEND_HARDLIGHT: + res = CAIRO_OPERATOR_HARD_LIGHT; + break; + case SP_CSS_BLEND_SOFTLIGHT: + res = CAIRO_OPERATOR_SOFT_LIGHT; + break; + case SP_CSS_BLEND_DIFFERENCE: + res = CAIRO_OPERATOR_DIFFERENCE; + break; + case SP_CSS_BLEND_EXCLUSION: + res = CAIRO_OPERATOR_EXCLUSION; + break; + case SP_CSS_BLEND_HUE: + res = CAIRO_OPERATOR_HSL_HUE; + break; + case SP_CSS_BLEND_SATURATION: + res = CAIRO_OPERATOR_HSL_SATURATION; + break; + case SP_CSS_BLEND_COLOR: + res = CAIRO_OPERATOR_HSL_COLOR; + break; + case SP_CSS_BLEND_LUMINOSITY: + res = CAIRO_OPERATOR_HSL_LUMINOSITY; + break; + case SP_CSS_BLEND_NORMAL: + res = CAIRO_OPERATOR_OVER; + break; + default: + g_error("Invalid SPBlendMode %d", css_blend); + } + return res; +} + + + +int ink_cairo_surface_linear_to_srgb(cairo_surface_t *surface) +{ + cairo_surface_flush(surface); + int width = cairo_image_surface_get_width(surface); + int height = cairo_image_surface_get_height(surface); + // int stride = cairo_image_surface_get_stride(surface); + // unsigned char *data = cairo_image_surface_get_data(surface); + + ink_cairo_surface_filter( surface, surface, SurfaceLinearToSrgb() ); + + // /* TODO convert this to OpenMP somehow */ + // for (int y = 0; y < height; ++y, data += stride) { + // for (int x = 0; x < width; ++x) { + // guint32 px = *reinterpret_cast<guint32*>(data + 4*x); + // EXTRACT_ARGB32(px, a,r,g,b) ; // Unneeded semi-colon for indenting + // if( a != 0 ) { + // r = linear_to_srgb( r, a ); + // g = linear_to_srgb( g, a ); + // b = linear_to_srgb( b, a ); + // } + // ASSEMBLE_ARGB32(px2, a,r,g,b); + // *reinterpret_cast<guint32*>(data + 4*x) = px2; + // } + // } + return width * height; +} + +cairo_pattern_t * +ink_cairo_pattern_create_checkerboard(guint32 rgba, bool use_alpha) +{ + int const w = 6; + int const h = 6; + + double r = SP_RGBA32_R_F(rgba); + double g = SP_RGBA32_G_F(rgba); + double b = SP_RGBA32_B_F(rgba); + + float hsl[3]; + SPColor::rgb_to_hsl_floatv(hsl, r, g, b); + hsl[2] += hsl[2] < 0.08 ? 0.08 : -0.08; // 0.08 = 0.77-0.69, the original checkerboard colors. + + float rgb2[3]; + SPColor::hsl_to_rgb_floatv(rgb2, hsl[0], hsl[1], hsl[2]); + + cairo_surface_t *s = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 2*w, 2*h); + + cairo_t *ct = cairo_create(s); + cairo_set_operator(ct, CAIRO_OPERATOR_SOURCE); + cairo_set_source_rgb(ct, r, g, b); + cairo_paint(ct); + cairo_set_source_rgb(ct, rgb2[0], rgb2[1], rgb2[2]); + cairo_rectangle(ct, 0, 0, w, h); + cairo_rectangle(ct, w, h, w, h); + cairo_fill(ct); + if (use_alpha) { + // use alpha to show opacity cover checkerboard + double a = SP_RGBA32_A_F(rgba); + if (a > 0.0) { + cairo_set_operator(ct, CAIRO_OPERATOR_OVER); + cairo_rectangle(ct, 0, 0, 2 * w, 2 * h); + cairo_set_source_rgba(ct, r, g, b, a); + cairo_fill(ct); + } + } + cairo_destroy(ct); + + cairo_pattern_t *p = cairo_pattern_create_for_surface(s); + cairo_pattern_set_extend(p, CAIRO_EXTEND_REPEAT); + cairo_pattern_set_filter(p, CAIRO_FILTER_NEAREST); + + cairo_surface_destroy(s); + return p; +} + + +/** + * Draw drop shadow around the 'rect' with given 'size' and 'color'; shadow extends to the right and bottom of rect. + */ +void ink_cairo_draw_drop_shadow(Cairo::RefPtr<Cairo::Context> ctx, const Geom::Rect& rect, double size, guint32 color, double color_alpha) { + // draw fake drop shadow built from gradients + const auto r = SP_RGBA32_R_F(color); + const auto g = SP_RGBA32_G_F(color); + const auto b = SP_RGBA32_B_F(color); + const auto a = color_alpha; + const Geom::Point corners[] = { rect.corner(0), rect.corner(1), rect.corner(2), rect.corner(3) }; + // space for gradient shadow + double sw = size; + double half = sw / 2; + using Geom::X; + using Geom::Y; + // 8 gradients total: 4 sides + 4 corners + auto grad_top = Cairo::LinearGradient::create(0, corners[0][Y] + half, 0, corners[0][Y] - half); + auto grad_right = Cairo::LinearGradient::create(corners[1][X], 0, corners[1][X] + sw, 0); + auto grad_bottom = Cairo::LinearGradient::create(0, corners[2][Y], 0, corners[2][Y] + sw); + auto grad_left = Cairo::LinearGradient::create(corners[0][X] + half, 0, corners[0][X] - half, 0); + auto grad_btm_right = Cairo::RadialGradient::create(corners[2][X], corners[2][Y], 0, corners[2][X], corners[2][Y], sw); + auto grad_top_right = Cairo::RadialGradient::create(corners[1][X], corners[1][Y] + half, 0, corners[1][X], corners[1][Y] + half, sw); + auto grad_btm_left = Cairo::RadialGradient::create(corners[3][X] + half, corners[3][Y], 0, corners[3][X] + half, corners[3][Y], sw); + auto grad_top_left = Cairo::RadialGradient::create(corners[0][X], corners[0][Y], 0, corners[0][X], corners[0][Y], half); + const int N = 15; // number of gradient stops; stops used to make it non-linear + // using easing function here: (exp(a*(1-t)) - 1) / (exp(a) - 1); + // it has a nice property of growing from 0 to 1 for t in [0..1] + const auto A = 4.0; // this coefficient changes how steep the curve is and controls shadow drop-off + const auto denominator = exp(A) - 1; + for (int i = 0; i <= N; ++i) { + auto pos = static_cast<double>(i) / N; + // exponential decay for drop shadow - long tail, with values from 100% down to 0% opacity + auto t = 1 - pos; // reverse 't' so alpha drops from 1 to 0 + auto alpha = (exp(A * t) - 1) / denominator; + grad_top->add_color_stop_rgba(pos, r, g, b, alpha * a); + grad_bottom->add_color_stop_rgba(pos, r, g, b, alpha * a); + grad_right->add_color_stop_rgba(pos, r, g, b, alpha * a); + grad_left->add_color_stop_rgba(pos, r, g, b, alpha * a); + grad_btm_right->add_color_stop_rgba(pos, r, g, b, alpha * a); + grad_top_right->add_color_stop_rgba(pos, r, g, b, alpha * a); + grad_btm_left->add_color_stop_rgba(pos, r, g, b, alpha * a); + // this left/top corner is just a silver of the shadow: half of it is "hidden" beneath the page + if (pos >= 0.5) { + grad_top_left->add_color_stop_rgba(2 * (pos - 0.5), r, g, b, alpha * a); + } + } + + // shadow at the top (faint) + ctx->rectangle(corners[0][X], corners[0][Y] - half, std::max(corners[1][X] - corners[0][X], 0.0), half); + ctx->set_source(grad_top); + ctx->fill(); + + // right side + ctx->rectangle(corners[1][X], corners[1][Y] + half, sw, std::max(corners[2][Y] - corners[1][Y] - half, 0.0)); + ctx->set_source(grad_right); + ctx->fill(); + + // bottom side + ctx->rectangle(corners[0][X] + half, corners[2][Y], std::max(corners[1][X] - corners[0][X] - half, 0.0), sw); + ctx->set_source(grad_bottom); + ctx->fill(); + + // left side (faint) + ctx->rectangle(corners[0][X] - half, corners[0][Y], half, std::max(corners[2][Y] - corners[1][Y], 0.0)); + ctx->set_source(grad_left); + ctx->fill(); + + // bottom corners + ctx->rectangle(corners[2][X], corners[2][Y], sw, sw); + ctx->set_source(grad_btm_right); + ctx->fill(); + + ctx->rectangle(corners[3][X] - half, corners[3][Y], std::min(sw, rect.width() + half), sw); + ctx->set_source(grad_btm_left); + ctx->fill(); + + // top corners + ctx->rectangle(corners[1][X], corners[1][Y] - half, sw, std::min(sw, rect.height() + half)); + ctx->set_source(grad_top_right); + ctx->fill(); + + ctx->rectangle(corners[0][X] - half, corners[0][Y] - half, half, half); + ctx->set_source(grad_top_left); + ctx->fill(); +} + +/** + * Converts the Cairo surface to a GdkPixbuf pixel format, + * without allocating extra memory. + * + * This function is intended mainly for creating previews displayed by GTK. + * For loading images for display on the canvas, use the Inkscape::Pixbuf object. + * + * The returned GdkPixbuf takes ownership of the passed surface reference, + * so it should NOT be freed after calling this function. + */ +GdkPixbuf *ink_pixbuf_create_from_cairo_surface(cairo_surface_t *s) +{ + guchar *pixels = cairo_image_surface_get_data(s); + int w = cairo_image_surface_get_width(s); + int h = cairo_image_surface_get_height(s); + int rs = cairo_image_surface_get_stride(s); + + convert_pixels_argb32_to_pixbuf(pixels, w, h, rs); + + GdkPixbuf *pb = gdk_pixbuf_new_from_data( + pixels, GDK_COLORSPACE_RGB, TRUE, 8, + w, h, rs, ink_cairo_pixbuf_cleanup, s); + + return pb; +} + +/** + * Cleanup function for GdkPixbuf. + * This function should be passed as the GdkPixbufDestroyNotify parameter + * to gdk_pixbuf_new_from_data when creating a GdkPixbuf backed by + * a Cairo surface. + */ +void ink_cairo_pixbuf_cleanup(guchar * /*pixels*/, void *data) +{ + cairo_surface_t *surface = static_cast<cairo_surface_t*>(data); + cairo_surface_destroy(surface); +} + +/* The following two functions use "from" instead of "to", because when you write: + val1 = argb32_from_pixbuf(val1); + the name of the format is closer to the value in that format. */ + +guint32 argb32_from_pixbuf(guint32 c) +{ + guint32 o = 0; +#if G_BYTE_ORDER == G_LITTLE_ENDIAN + guint32 a = (c & 0xff000000) >> 24; +#else + guint32 a = (c & 0x000000ff); +#endif + if (a != 0) { + // extract color components +#if G_BYTE_ORDER == G_LITTLE_ENDIAN + guint32 r = (c & 0x000000ff); + guint32 g = (c & 0x0000ff00) >> 8; + guint32 b = (c & 0x00ff0000) >> 16; +#else + guint32 r = (c & 0xff000000) >> 24; + guint32 g = (c & 0x00ff0000) >> 16; + guint32 b = (c & 0x0000ff00) >> 8; +#endif + // premultiply + r = premul_alpha(r, a); + b = premul_alpha(b, a); + g = premul_alpha(g, a); + // combine into output + o = (a << 24) | (r << 16) | (g << 8) | (b); + } + return o; +} + +/** + * Convert one pixel from ARGB to GdkPixbuf format. + * + * @param c ARGB color + * @param bgcolor Color to use if c.alpha is zero (bgcolor.alpha is ignored) + */ +guint32 pixbuf_from_argb32(guint32 c, guint32 bgcolor) +{ + guint32 a = (c & 0xff000000) >> 24; + if (a == 0) { + assert(c == 0); + c = bgcolor; + } + + // extract color components + guint32 r = (c & 0x00ff0000) >> 16; + guint32 g = (c & 0x0000ff00) >> 8; + guint32 b = (c & 0x000000ff); + + if (a != 0) { + r = unpremul_alpha(r, a); + g = unpremul_alpha(g, a); + b = unpremul_alpha(b, a); + } + + // combine into output +#if G_BYTE_ORDER == G_LITTLE_ENDIAN + guint32 o = (r) | (g << 8) | (b << 16) | (a << 24); +#else + guint32 o = (r << 24) | (g << 16) | (b << 8) | (a); +#endif + return o; +} + +/** + * Convert pixel data from GdkPixbuf format to ARGB. + * This will convert pixel data from GdkPixbuf format to Cairo's native pixel format. + * This involves premultiplying alpha and shuffling around the channels. + * Pixbuf data must have an alpha channel, otherwise the results are undefined + * (usually a segfault). + */ +void +convert_pixels_pixbuf_to_argb32(guchar *data, int w, int h, int stride) +{ + if (!data || w < 1 || h < 1 || stride < 1) { + return; + } + + for (size_t i = 0; i < h; ++i) { + guint32 *px = reinterpret_cast<guint32*>(data + i*stride); + for (size_t j = 0; j < w; ++j) { + *px = argb32_from_pixbuf(*px); + ++px; + } + } +} + +/** + * Convert pixel data from ARGB to GdkPixbuf format. + * This will convert pixel data from GdkPixbuf format to Cairo's native pixel format. + * This involves premultiplying alpha and shuffling around the channels. + */ +void +convert_pixels_argb32_to_pixbuf(guchar *data, int w, int h, int stride, guint32 bgcolor) +{ + if (!data || w < 1 || h < 1 || stride < 1) { + return; + } + for (size_t i = 0; i < h; ++i) { + guint32 *px = reinterpret_cast<guint32*>(data + i*stride); + for (size_t j = 0; j < w; ++j) { + *px = pixbuf_from_argb32(*px, bgcolor); + ++px; + } + } +} + +/** + * Converts GdkPixbuf's data to premultiplied ARGB. + * This function will convert a GdkPixbuf in place into Cairo's native pixel format. + * Note that this is a hack intended to save memory. When the pixbuf is in Cairo's format, + * using it with GTK will result in corrupted drawings. + */ +void +ink_pixbuf_ensure_argb32(GdkPixbuf *pb) +{ + gchar *pixel_format = reinterpret_cast<gchar*>(g_object_get_data(G_OBJECT(pb), "pixel_format")); + if (pixel_format != nullptr && strcmp(pixel_format, "argb32") == 0) { + // nothing to do + return; + } + + convert_pixels_pixbuf_to_argb32( + gdk_pixbuf_get_pixels(pb), + gdk_pixbuf_get_width(pb), + gdk_pixbuf_get_height(pb), + gdk_pixbuf_get_rowstride(pb)); + g_object_set_data_full(G_OBJECT(pb), "pixel_format", g_strdup("argb32"), g_free); +} + +/** + * Converts GdkPixbuf's data back to its native format. + * Once this is done, the pixbuf can be used with GTK again. + */ +void +ink_pixbuf_ensure_normal(GdkPixbuf *pb) +{ + gchar *pixel_format = reinterpret_cast<gchar*>(g_object_get_data(G_OBJECT(pb), "pixel_format")); + if (pixel_format == nullptr || strcmp(pixel_format, "pixbuf") == 0) { + // nothing to do + return; + } + + convert_pixels_argb32_to_pixbuf( + gdk_pixbuf_get_pixels(pb), + gdk_pixbuf_get_width(pb), + gdk_pixbuf_get_height(pb), + gdk_pixbuf_get_rowstride(pb)); + g_object_set_data_full(G_OBJECT(pb), "pixel_format", g_strdup("pixbuf"), g_free); +} + +guint32 argb32_from_rgba(guint32 in) +{ + guint32 r, g, b, a; + a = (in & 0x000000ff); + r = premul_alpha((in & 0xff000000) >> 24, a); + g = premul_alpha((in & 0x00ff0000) >> 16, a); + b = premul_alpha((in & 0x0000ff00) >> 8, a); + ASSEMBLE_ARGB32(px, a, r, g, b) + return px; +} + + +/** + * Converts a pixbuf to a PNG data structure. + * For 8-but RGBA png, this is like copying. + * + */ +const guchar* pixbuf_to_png(guchar const**rows, guchar* px, int num_rows, int num_cols, int stride, int color_type, int bit_depth) +{ + int n_fields = 1 + (color_type&2) + (color_type&4)/4; + const guchar* new_data = (const guchar*)malloc(((n_fields * bit_depth * num_cols + 7)/8) * num_rows); + char* ptr = (char*) new_data; + // Used when we write image data smaller than one byte (for instance in + // black and white images where 1px = 1bit). Only possible with greyscale. + int pad = 0; + for (int row = 0; row < num_rows; ++row) { + rows[row] = (const guchar*)ptr; + for (int col = 0; col < num_cols; ++col) { + guint32 *pixel = reinterpret_cast<guint32*>(px + row*stride)+col; + + guint64 pix3 = (*pixel & 0xff000000) >> 24; + guint64 pix2 = (*pixel & 0x00ff0000) >> 16; + guint64 pix1 = (*pixel & 0x0000ff00) >> 8; + guint64 pix0 = (*pixel & 0x000000ff); + +#if G_BYTE_ORDER == G_LITTLE_ENDIAN + guint64 a = pix3, b = pix2, g = pix1, r = pix0; +#else + guint64 r = pix3, g = pix2, b = pix1, a = pix0; +#endif + + // One of possible rgb to greyscale formulas. This one is called "luminance", "luminosity" or "luma" + guint16 gray = (guint16)((guint32)((0.2126*(r<<24) + 0.7152*(g<<24) + 0.0722*(b<<24)))>>16); + + if (color_type & 2) { // RGB or RGBA + // for 8bit->16bit transition, I take the FF -> FFFF convention (multiplication by 0x101). + // If you prefer FF -> FF00 (multiplication by 0x100), remove the <<8, <<24, <<40 and <<56 + // for little-endian, and remove the <<0, <<16, <<32 and <<48 for big-endian. + if (color_type & 4) { // RGBA + if (bit_depth == 8) + *((guint32*)ptr) = *pixel; + else + // This uses the samples in the order they appear in pixel rather than + // normalised to abgr or rgba in order to make it endian agnostic, + // exploiting the symmetry of the expression (0x101 is the same in both + // endiannesses and each sample is multiplied by that). + *((guint64*)ptr) = (guint64)((pix3<<56)+(pix3<<48)+(pix2<<40)+(pix2<<32)+(pix1<<24)+(pix1<<16)+(pix0<<8)+(pix0)); + } else { // RGB + if (bit_depth == 8) { + *ptr = r; + *(ptr+1) = g; + *(ptr+2) = b; + } else { + *((guint16*)ptr) = (r<<8)+r; + *((guint16*)(ptr+2)) = (g<<8)+g; + *((guint16*)(ptr+4)) = (b<<8)+b; + } + } + } else { // Grayscale + if (bit_depth == 16) { +#if G_BYTE_ORDER == G_LITTLE_ENDIAN + *(guint16*)ptr = ((gray & 0xff00)>>8) + ((gray & 0x00ff)<<8); +#else + *(guint16*)ptr = gray; +#endif + // For 8bit->16bit this mirrors RGB(A), multiplying by + // 0x101; if you prefer multiplying by 0x100, remove the + // <<8 for little-endian, and remove the unshifted value + // for big-endian. + if (color_type & 4) // Alpha channel + *((guint16*)(ptr+2)) = a + (a<<8); + } else if (bit_depth == 8) { + *ptr = guint8(gray >> 8); + if (color_type & 4) // Alpha channel + *((guint8*)(ptr+1)) = a; + } else { + if (!pad) *ptr=0; + // In PNG numbers are stored left to right, but in most significant bits first, so the first one processed is the ``big'' mask, etc. + int realpad = 8 - bit_depth - pad; + *ptr += guint8((gray >> (16-bit_depth))<<realpad); // Note the "+=" + if (color_type & 4) // Alpha channel + *(ptr+1) += guint8((a >> (8-bit_depth))<<(bit_depth + realpad)); + } + } + + pad += bit_depth*n_fields; + ptr += pad/8; + pad %= 8; + } + // Align bytes on rows + if (pad) { + pad = 0; + ptr++; + } + } + return new_data; +} + + + + + + + + +/* + 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 : |