diff options
Diffstat (limited to 'src/display/nr-style.cpp')
| -rw-r--r-- | src/display/nr-style.cpp | 442 |
1 files changed, 442 insertions, 0 deletions
diff --git a/src/display/nr-style.cpp b/src/display/nr-style.cpp new file mode 100644 index 0000000..fc1e797 --- /dev/null +++ b/src/display/nr-style.cpp @@ -0,0 +1,442 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/** + * @file + * Style information for rendering. + *//* + * Authors: + * Krzysztof Kosiński <tweenk.pl@gmail.com> + * + * Copyright (C) 2010 Authors + * Released under GNU GPL v2+, read the file 'COPYING' for more information. + */ + +#include "display/nr-style.h" +#include "style.h" + +#include "display/drawing-context.h" +#include "display/drawing-pattern.h" + +#include "object/sp-paint-server.h" + +void NRStyle::Paint::clear() +{ + if (server) { + sp_object_unref(server, nullptr); + server = nullptr; + } + type = PAINT_NONE; +} + +void NRStyle::Paint::set(SPColor const &c) +{ + clear(); + type = PAINT_COLOR; + color = c; +} + +void NRStyle::Paint::set(SPPaintServer *ps) +{ + clear(); + if (ps) { + type = PAINT_SERVER; + server = ps; + sp_object_ref(server, nullptr); + } +} + +void NRStyle::Paint::set(const SPIPaint* paint) +{ + if (paint->isPaintserver()) { + SPPaintServer* server = paint->value.href->getObject(); + if (server && server->isValid()) { + set(server); + } else if (paint->colorSet) { + set(paint->value.color); + } else { + clear(); + } + } else if (paint->isColor()) { + set(paint->value.color); + } else if (paint->isNone()) { + clear(); + } else if (paint->paintOrigin == SP_CSS_PAINT_ORIGIN_CONTEXT_FILL || + paint->paintOrigin == SP_CSS_PAINT_ORIGIN_CONTEXT_STROKE) { + // A marker in the defs section will result in ending up here. + // std::cerr << "NRStyle::Paint::set: Double" << std::endl; + } else { + g_assert_not_reached(); + } +} + + +NRStyle::NRStyle() + : fill() + , stroke() + , stroke_width(0.0) + , hairline(false) + , miter_limit(0.0) + , n_dash(0) + , dash(nullptr) + , dash_offset(0.0) + , fill_rule(CAIRO_FILL_RULE_EVEN_ODD) + , line_cap(CAIRO_LINE_CAP_BUTT) + , line_join(CAIRO_LINE_JOIN_MITER) + , fill_pattern(nullptr) + , stroke_pattern(nullptr) + , text_decoration_fill_pattern(nullptr) + , text_decoration_stroke_pattern(nullptr) + , text_decoration_line(TEXT_DECORATION_LINE_CLEAR) + , text_decoration_style(TEXT_DECORATION_STYLE_CLEAR) + , text_decoration_fill() + , text_decoration_stroke() + , text_decoration_stroke_width(0.0) + , phase_length(0.0) + , tspan_line_start(false) + , tspan_line_end(false) + , tspan_width(0) + , ascender(0) + , descender(0) + , underline_thickness(0) + , underline_position(0) + , line_through_thickness(0) + , line_through_position(0) + , font_size(0) +{ + paint_order_layer[0] = PAINT_ORDER_NORMAL; +} + +NRStyle::~NRStyle() +{ + if (fill_pattern) cairo_pattern_destroy(fill_pattern); + if (stroke_pattern) cairo_pattern_destroy(stroke_pattern); + if (text_decoration_fill_pattern) cairo_pattern_destroy(text_decoration_fill_pattern); + if (text_decoration_stroke_pattern) cairo_pattern_destroy(text_decoration_stroke_pattern); + if (dash){ + delete [] dash; + } + fill.clear(); + stroke.clear(); + text_decoration_fill.clear(); + text_decoration_stroke.clear(); +} + +void NRStyle::set(SPStyle *style, SPStyle *context_style) +{ + // Handle 'context-fill' and 'context-stroke': Work in progress + const SPIPaint *style_fill = &(style->fill); + if( style_fill->paintOrigin == SP_CSS_PAINT_ORIGIN_CONTEXT_FILL ) { + if( context_style != nullptr ) { + style_fill = &(context_style->fill); + } else { + // A marker in the defs section will result in ending up here. + //std::cerr << "NRStyle::set: 'context-fill': 'context_style' is NULL" << std::endl; + } + } else if ( style_fill->paintOrigin == SP_CSS_PAINT_ORIGIN_CONTEXT_STROKE ) { + if( context_style != nullptr ) { + style_fill = &(context_style->stroke); + } else { + //std::cerr << "NRStyle::set: 'context-stroke': 'context_style' is NULL" << std::endl; + } + } + + fill.set(style_fill); + fill.opacity = SP_SCALE24_TO_FLOAT(style->fill_opacity.value); + + switch (style->fill_rule.computed) { + case SP_WIND_RULE_EVENODD: + fill_rule = CAIRO_FILL_RULE_EVEN_ODD; + break; + case SP_WIND_RULE_NONZERO: + fill_rule = CAIRO_FILL_RULE_WINDING; + break; + default: + g_assert_not_reached(); + } + + const SPIPaint *style_stroke = &(style->stroke); + if( style_stroke->paintOrigin == SP_CSS_PAINT_ORIGIN_CONTEXT_FILL ) { + if( context_style != nullptr ) { + style_stroke = &(context_style->fill); + } else { + //std::cerr << "NRStyle::set: 'context-fill': 'context_style' is NULL" << std::endl; + } + } else if ( style_stroke->paintOrigin == SP_CSS_PAINT_ORIGIN_CONTEXT_STROKE ) { + if( context_style != nullptr ) { + style_stroke = &(context_style->stroke); + } else { + //std::cerr << "NRStyle::set: 'context-stroke': 'context_style' is NULL" << std::endl; + } + } + + stroke.set(style_stroke); + stroke.opacity = SP_SCALE24_TO_FLOAT(style->stroke_opacity.value); + stroke_width = style->stroke_width.computed; + hairline = style->stroke_extensions.hairline; + switch (style->stroke_linecap.computed) { + case SP_STROKE_LINECAP_ROUND: + line_cap = CAIRO_LINE_CAP_ROUND; + break; + case SP_STROKE_LINECAP_SQUARE: + line_cap = CAIRO_LINE_CAP_SQUARE; + break; + case SP_STROKE_LINECAP_BUTT: + line_cap = CAIRO_LINE_CAP_BUTT; + break; + default: + g_assert_not_reached(); + } + switch (style->stroke_linejoin.computed) { + case SP_STROKE_LINEJOIN_ROUND: + line_join = CAIRO_LINE_JOIN_ROUND; + break; + case SP_STROKE_LINEJOIN_BEVEL: + line_join = CAIRO_LINE_JOIN_BEVEL; + break; + case SP_STROKE_LINEJOIN_MITER: + line_join = CAIRO_LINE_JOIN_MITER; + break; + default: + g_assert_not_reached(); + } + miter_limit = style->stroke_miterlimit.value; + + if (dash){ + delete [] dash; + } + + n_dash = style->stroke_dasharray.values.size(); + if (n_dash != 0) { + dash_offset = style->stroke_dashoffset.computed; + dash = new double[n_dash]; + for (unsigned int i = 0; i < n_dash; ++i) { + dash[i] = style->stroke_dasharray.values[i].computed; + } + } else { + dash_offset = 0.0; + dash = nullptr; + } + + + for( unsigned i = 0; i < PAINT_ORDER_LAYERS; ++i) { + switch (style->paint_order.layer[i]) { + case SP_CSS_PAINT_ORDER_NORMAL: + paint_order_layer[i]=PAINT_ORDER_NORMAL; + break; + case SP_CSS_PAINT_ORDER_FILL: + paint_order_layer[i]=PAINT_ORDER_FILL; + break; + case SP_CSS_PAINT_ORDER_STROKE: + paint_order_layer[i]=PAINT_ORDER_STROKE; + break; + case SP_CSS_PAINT_ORDER_MARKER: + paint_order_layer[i]=PAINT_ORDER_MARKER; + break; + } + } + + text_decoration_line = TEXT_DECORATION_LINE_CLEAR; + if(style->text_decoration_line.inherit ){ text_decoration_line |= TEXT_DECORATION_LINE_INHERIT; } + if(style->text_decoration_line.underline ){ text_decoration_line |= TEXT_DECORATION_LINE_UNDERLINE + TEXT_DECORATION_LINE_SET; } + if(style->text_decoration_line.overline ){ text_decoration_line |= TEXT_DECORATION_LINE_OVERLINE + TEXT_DECORATION_LINE_SET; } + if(style->text_decoration_line.line_through){ text_decoration_line |= TEXT_DECORATION_LINE_LINETHROUGH + TEXT_DECORATION_LINE_SET; } + if(style->text_decoration_line.blink ){ text_decoration_line |= TEXT_DECORATION_LINE_BLINK + TEXT_DECORATION_LINE_SET; } + + text_decoration_style = TEXT_DECORATION_STYLE_CLEAR; + if(style->text_decoration_style.inherit ){ text_decoration_style |= TEXT_DECORATION_STYLE_INHERIT; } + if(style->text_decoration_style.solid ){ text_decoration_style |= TEXT_DECORATION_STYLE_SOLID + TEXT_DECORATION_STYLE_SET; } + if(style->text_decoration_style.isdouble ){ text_decoration_style |= TEXT_DECORATION_STYLE_ISDOUBLE + TEXT_DECORATION_STYLE_SET; } + if(style->text_decoration_style.dotted ){ text_decoration_style |= TEXT_DECORATION_STYLE_DOTTED + TEXT_DECORATION_STYLE_SET; } + if(style->text_decoration_style.dashed ){ text_decoration_style |= TEXT_DECORATION_STYLE_DASHED + TEXT_DECORATION_STYLE_SET; } + if(style->text_decoration_style.wavy ){ text_decoration_style |= TEXT_DECORATION_STYLE_WAVY + TEXT_DECORATION_STYLE_SET; } + + /* FIXME + The meaning of text-decoration-color in CSS3 for SVG is ambiguous (2014-05-06). Set + it for fill, for stroke, for both? Both would seem like the obvious choice but what happens + is that for text which is just fill (very common) it makes the lines fatter because it + enables stroke on the decorations when it wasn't present on the text. That contradicts the + usual behavior where the text and decorations by default have the same fill/stroke. + + The behavior here is that if color is defined it is applied to text_decoration_fill/stroke + ONLY if the corresponding fill/stroke is also present. + + Hopefully the standard will be clarified to resolve this issue. + */ + + // Unless explicitly set on an element, text decoration is inherited from + // closest ancestor where 'text-decoration' was set. That is, setting + // 'text-decoration' on an ancestor fixes the fill and stroke of the + // decoration to the fill and stroke values of that ancestor. + SPStyle* style_td = style; + if ( style->text_decoration.style_td ) style_td = style->text_decoration.style_td; + text_decoration_stroke.opacity = SP_SCALE24_TO_FLOAT(style_td->stroke_opacity.value); + text_decoration_stroke_width = style_td->stroke_width.computed; + + // Priority is given in order: + // * text_decoration_fill + // * text_decoration_color (only if fill set) + // * fill + if (style_td->text_decoration_fill.set) { + text_decoration_fill.set(&(style_td->text_decoration_fill)); + } else if (style_td->text_decoration_color.set) { + if(style->fill.isPaintserver() || style->fill.isColor()) { + // SVG sets color specifically + text_decoration_fill.set(style->text_decoration_color.value.color); + } else { + // No decoration fill because no text fill + text_decoration_fill.clear(); + } + } else { + // Pick color/pattern from text + text_decoration_fill.set(&(style_td->fill)); + } + + if (style_td->text_decoration_stroke.set) { + text_decoration_stroke.set(&(style_td->text_decoration_stroke)); + } else if (style_td->text_decoration_color.set) { + if(style->stroke.isPaintserver() || style->stroke.isColor()) { + // SVG sets color specifically + text_decoration_stroke.set(style->text_decoration_color.value.color); + } else { + // No decoration stroke because no text stroke + text_decoration_stroke.clear(); + } + } else { + // Pick color/pattern from text + text_decoration_stroke.set(&(style_td->stroke)); + } + + if (text_decoration_line != TEXT_DECORATION_LINE_CLEAR) { + phase_length = style->text_decoration_data.phase_length; + tspan_line_start = style->text_decoration_data.tspan_line_start; + tspan_line_end = style->text_decoration_data.tspan_line_end; + tspan_width = style->text_decoration_data.tspan_width; + ascender = style->text_decoration_data.ascender; + descender = style->text_decoration_data.descender; + underline_thickness = style->text_decoration_data.underline_thickness; + underline_position = style->text_decoration_data.underline_position; + line_through_thickness = style->text_decoration_data.line_through_thickness; + line_through_position = style->text_decoration_data.line_through_position; + font_size = style->font_size.computed; + } + + text_direction = style->direction.computed; + + update(); +} + +cairo_pattern_t* NRStyle::preparePaint(Inkscape::DrawingContext &dc, Geom::OptRect const &paintbox, Inkscape::DrawingPattern *pattern, Paint& paint) +{ + cairo_pattern_t* cpattern = nullptr; + + switch (paint.type) { + case PAINT_SERVER: + if (pattern) { + cpattern = pattern->renderPattern(paint.opacity); + } else { + cpattern = paint.server->pattern_new(dc.raw(), paintbox, paint.opacity); + } + break; + case PAINT_COLOR: { + SPColor const &c = paint.color; + cpattern = cairo_pattern_create_rgba( + c.v.c[0], c.v.c[1], c.v.c[2], paint.opacity); + double red = 0; + double green = 0; + double blue = 0; + double alpha = 0; + cairo_pattern_get_rgba(cpattern, &red, &green, &blue, &alpha); + } + break; + default: + break; + } + return cpattern; +} + +bool NRStyle::prepareFill(Inkscape::DrawingContext &dc, Geom::OptRect const &paintbox, Inkscape::DrawingPattern *pattern) +{ + if (!fill_pattern) fill_pattern = preparePaint(dc, paintbox, pattern, fill); + return fill_pattern != nullptr; +} + +bool NRStyle::prepareStroke(Inkscape::DrawingContext &dc, Geom::OptRect const &paintbox, Inkscape::DrawingPattern *pattern) +{ + if (!stroke_pattern) stroke_pattern = preparePaint(dc, paintbox, pattern, stroke); + return stroke_pattern != nullptr; +} + +bool NRStyle::prepareTextDecorationFill(Inkscape::DrawingContext &dc, Geom::OptRect const &paintbox, Inkscape::DrawingPattern *pattern) +{ + if (!text_decoration_fill_pattern) text_decoration_fill_pattern = preparePaint(dc, paintbox, pattern, text_decoration_fill); + return text_decoration_fill_pattern != nullptr; +} + +bool NRStyle::prepareTextDecorationStroke(Inkscape::DrawingContext &dc, Geom::OptRect const &paintbox, Inkscape::DrawingPattern *pattern) +{ + if (!text_decoration_stroke_pattern) text_decoration_stroke_pattern = preparePaint(dc, paintbox, pattern, text_decoration_stroke); + return text_decoration_stroke_pattern != nullptr; +} + +void NRStyle::applyFill(Inkscape::DrawingContext &dc) +{ + dc.setSource(fill_pattern); + dc.setFillRule(fill_rule); +} + +void NRStyle::applyTextDecorationFill(Inkscape::DrawingContext &dc) +{ + dc.setSource(text_decoration_fill_pattern); + // Fill rule does not matter, no intersections. +} + +void NRStyle::applyStroke(Inkscape::DrawingContext &dc) +{ + dc.setSource(stroke_pattern); + if (hairline) { + dc.setHairline(); + } else { + dc.setLineWidth(stroke_width); + } + dc.setLineCap(line_cap); + dc.setLineJoin(line_join); + dc.setMiterLimit(miter_limit); + cairo_set_dash(dc.raw(), dash, n_dash, dash_offset); // fixme +} + +void NRStyle::applyTextDecorationStroke(Inkscape::DrawingContext &dc) +{ + dc.setSource(text_decoration_stroke_pattern); + if (hairline) { + dc.setHairline(); + } else { + dc.setLineWidth(text_decoration_stroke_width); + } + dc.setLineCap(CAIRO_LINE_CAP_BUTT); + dc.setLineJoin(CAIRO_LINE_JOIN_MITER); + dc.setMiterLimit(miter_limit); + cairo_set_dash(dc.raw(), nullptr, 0, 0.0); // fixme (no dash) +} + +void NRStyle::update() +{ + // force pattern update + if (fill_pattern) cairo_pattern_destroy(fill_pattern); + if (stroke_pattern) cairo_pattern_destroy(stroke_pattern); + if (text_decoration_fill_pattern) cairo_pattern_destroy(text_decoration_fill_pattern); + if (text_decoration_stroke_pattern) cairo_pattern_destroy(text_decoration_stroke_pattern); + fill_pattern = nullptr; + stroke_pattern = nullptr; + text_decoration_fill_pattern = nullptr; + text_decoration_stroke_pattern = nullptr; +} + +/* + 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 : |