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Diffstat (limited to 'src/extension/internal/cairo-render-context.cpp')
| -rw-r--r-- | src/extension/internal/cairo-render-context.cpp | 2040 |
1 files changed, 2040 insertions, 0 deletions
diff --git a/src/extension/internal/cairo-render-context.cpp b/src/extension/internal/cairo-render-context.cpp new file mode 100644 index 0000000..063938b --- /dev/null +++ b/src/extension/internal/cairo-render-context.cpp @@ -0,0 +1,2040 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/** \file + * Rendering with Cairo. + */ +/* + * Author: + * Miklos Erdelyi <erdelyim@gmail.com> + * Jon A. Cruz <jon@joncruz.org> + * Abhishek Sharma + * + * Copyright (C) 2006 Miklos Erdelyi + * + * Released under GNU GPL v2+, read the file 'COPYING' for more information. + */ + +#ifdef HAVE_CONFIG_H +# include "config.h" // only include where actually required! +#endif + +#ifndef PANGO_ENABLE_BACKEND +#define PANGO_ENABLE_BACKEND +#endif + +#ifndef PANGO_ENABLE_ENGINE +#define PANGO_ENABLE_ENGINE +#endif + +#include "cairo-render-context.h" + +#include <csignal> +#include <cerrno> +#include <2geom/pathvector.h> + +#include <glib.h> +#include <glibmm/i18n.h> + +#include "display/drawing.h" +#include "display/curve.h" +#include "display/cairo-utils.h" + +#include "object/sp-item.h" +#include "object/sp-item-group.h" +#include "object/sp-hatch.h" +#include "object/sp-linear-gradient.h" +#include "object/sp-radial-gradient.h" +#include "object/sp-mesh-gradient.h" +#include "object/sp-pattern.h" +#include "object/sp-mask.h" +#include "object/sp-clippath.h" + +#include "util/units.h" +#ifdef _WIN32 +#include "libnrtype/FontFactory.h" // USE_PANGO_WIN32 +#endif + +#include "cairo-renderer.h" +#include "extension/system.h" + +#include "io/sys.h" + +#include "svg/stringstream.h" + +#include <cairo.h> + +// include support for only the compiled-in surface types +#ifdef CAIRO_HAS_PDF_SURFACE +#include <cairo-pdf.h> +#endif +#ifdef CAIRO_HAS_PS_SURFACE +#include <cairo-ps.h> +#endif + + +#ifdef CAIRO_HAS_FT_FONT +#include <cairo-ft.h> +#endif +#ifdef CAIRO_HAS_WIN32_FONT +#include <pango/pangowin32.h> +#include <cairo-win32.h> +#endif + +#include <pango/pangofc-fontmap.h> + +//#define TRACE(_args) g_printf _args +//#define TRACE(_args) g_message _args +#define TRACE(_args) +//#define TEST(_args) _args +#define TEST(_args) + +// FIXME: expose these from sp-clippath/mask.cpp +/*struct SPClipPathView { + SPClipPathView *next; + unsigned int key; + Inkscape::DrawingItem *arenaitem; + Geom::OptRect bbox; +}; + +struct SPMaskView { + SPMaskView *next; + unsigned int key; + Inkscape::DrawingItem *arenaitem; + Geom::OptRect bbox; +};*/ + +namespace Inkscape { +namespace Extension { +namespace Internal { + +static cairo_status_t _write_callback(void *closure, const unsigned char *data, unsigned int length); + +CairoRenderContext::CairoRenderContext(CairoRenderer *parent) : + _dpi(72), + _pdf_level(1), + _ps_level(1), + _eps(false), + _is_texttopath(FALSE), + _is_omittext(FALSE), + _is_filtertobitmap(FALSE), + _is_show_page(false), + _bitmapresolution(72), + _stream(nullptr), + _is_valid(FALSE), + _vector_based_target(FALSE), + _cr(nullptr), // Cairo context + _surface(nullptr), + _target(CAIRO_SURFACE_TYPE_IMAGE), + _target_format(CAIRO_FORMAT_ARGB32), + _layout(nullptr), + _state(nullptr), + _renderer(parent), + _render_mode(RENDER_MODE_NORMAL), + _clip_mode(CLIP_MODE_MASK), + _omittext_state(EMPTY) +{ +} + +CairoRenderContext::~CairoRenderContext() +{ + for (std::map<gpointer, cairo_font_face_t *>::const_iterator iter = font_table.begin(); iter != font_table.end(); ++iter) + font_data_free(iter->second); + + if (_cr) cairo_destroy(_cr); + if (_surface) cairo_surface_destroy(_surface); + if (_layout) g_object_unref(_layout); +} +void CairoRenderContext::font_data_free(gpointer data) +{ + cairo_font_face_t *font_face = (cairo_font_face_t *)data; + if (font_face) { + cairo_font_face_destroy(font_face); + } +} + +CairoRenderer* CairoRenderContext::getRenderer() const +{ + return _renderer; +} + +CairoRenderState* CairoRenderContext::getCurrentState() const +{ + return _state; +} + +CairoRenderState* CairoRenderContext::getParentState() const +{ + // if this is the root node just return it + if (_state_stack.size() == 1) { + return _state; + } else { + return _state_stack[_state_stack.size()-2]; + } +} + +void CairoRenderContext::setStateForStyle(SPStyle const *style) +{ + // only opacity & overflow is stored for now + _state->opacity = SP_SCALE24_TO_FLOAT(style->opacity.value); + _state->has_overflow = (style->overflow.set && style->overflow.value != SP_CSS_OVERFLOW_VISIBLE); + _state->has_filtereffect = (style->filter.set != 0) ? TRUE : FALSE; + + if (style->fill.isPaintserver() || style->stroke.isPaintserver()) + _state->merge_opacity = FALSE; + + // disable rendering of opacity if there's a stroke on the fill + if (_state->merge_opacity + && !style->fill.isNone() + && !style->stroke.isNone()) + _state->merge_opacity = FALSE; +} + +/** + * \brief Creates a new render context which will be compatible with the given context's Cairo surface + * + * \param width width of the surface to be created + * \param height height of the surface to be created + */ +CairoRenderContext* +CairoRenderContext::cloneMe(double width, double height) const +{ + g_assert( _is_valid ); + g_assert( width > 0.0 && height > 0.0 ); + + CairoRenderContext *new_context = _renderer->createContext(); + cairo_surface_t *surface = cairo_surface_create_similar(cairo_get_target(_cr), CAIRO_CONTENT_COLOR_ALPHA, + (int)ceil(width), (int)ceil(height)); + new_context->_cr = cairo_create(surface); + new_context->_surface = surface; + new_context->_width = width; + new_context->_height = height; + new_context->_is_valid = TRUE; + + return new_context; +} + +CairoRenderContext* CairoRenderContext::cloneMe() const +{ + g_assert( _is_valid ); + + return cloneMe(_width, _height); +} + +bool CairoRenderContext::setImageTarget(cairo_format_t format) +{ + // format cannot be set on an already initialized surface + if (_is_valid) + return false; + + switch (format) { + case CAIRO_FORMAT_ARGB32: + case CAIRO_FORMAT_RGB24: + case CAIRO_FORMAT_A8: + case CAIRO_FORMAT_A1: + _target_format = format; + _target = CAIRO_SURFACE_TYPE_IMAGE; + return true; + break; + default: + break; + } + + return false; +} + +bool CairoRenderContext::setPdfTarget(gchar const *utf8_fn) +{ +#ifndef CAIRO_HAS_PDF_SURFACE + return false; +#else + _target = CAIRO_SURFACE_TYPE_PDF; + _vector_based_target = TRUE; +#endif + + FILE *osf = nullptr; + FILE *osp = nullptr; + + gsize bytesRead = 0; + gsize bytesWritten = 0; + GError *error = nullptr; + gchar *local_fn = g_filename_from_utf8(utf8_fn, + -1, &bytesRead, &bytesWritten, &error); + gchar const *fn = local_fn; + + /* TODO: Replace the below fprintf's with something that does the right thing whether in + * gui or batch mode (e.g. --print=blah). Consider throwing an exception: currently one of + * the callers (sp_print_document_to_file, "ret = mod->begin(doc)") wrongly ignores the + * return code. + */ + if (fn != nullptr) { + if (*fn == '|') { + fn += 1; + while (isspace(*fn)) fn += 1; +#ifndef _WIN32 + osp = popen(fn, "w"); +#else + osp = _popen(fn, "w"); +#endif + if (!osp) { + fprintf(stderr, "inkscape: popen(%s): %s\n", + fn, strerror(errno)); + return false; + } + _stream = osp; + } else if (*fn == '>') { + fn += 1; + while (isspace(*fn)) fn += 1; + Inkscape::IO::dump_fopen_call(fn, "K"); + osf = Inkscape::IO::fopen_utf8name(fn, "w+"); + if (!osf) { + fprintf(stderr, "inkscape: fopen(%s): %s\n", + fn, strerror(errno)); + return false; + } + _stream = osf; + } else { + /* put cwd stuff in here */ + gchar *qn = ( *fn + ? g_strdup_printf("lpr -P %s", fn) /* FIXME: quote fn */ + : g_strdup("lpr") ); +#ifndef _WIN32 + osp = popen(qn, "w"); +#else + osp = _popen(qn, "w"); +#endif + if (!osp) { + fprintf(stderr, "inkscape: popen(%s): %s\n", + qn, strerror(errno)); + return false; + } + g_free(qn); + _stream = osp; + } + } + + g_free(local_fn); + + if (_stream) { + /* fixme: this is kinda icky */ +#if !defined(_WIN32) && !defined(__WIN32__) + (void) signal(SIGPIPE, SIG_IGN); +#endif + } + + return true; +} + +bool CairoRenderContext::setPsTarget(gchar const *utf8_fn) +{ +#ifndef CAIRO_HAS_PS_SURFACE + return false; +#else + _target = CAIRO_SURFACE_TYPE_PS; + _vector_based_target = TRUE; +#endif + + FILE *osf = nullptr; + FILE *osp = nullptr; + + gsize bytesRead = 0; + gsize bytesWritten = 0; + GError *error = nullptr; + gchar *local_fn = g_filename_from_utf8(utf8_fn, + -1, &bytesRead, &bytesWritten, &error); + gchar const *fn = local_fn; + + /* TODO: Replace the below fprintf's with something that does the right thing whether in + * gui or batch mode (e.g. --print=blah). Consider throwing an exception: currently one of + * the callers (sp_print_document_to_file, "ret = mod->begin(doc)") wrongly ignores the + * return code. + */ + if (fn != nullptr) { + if (*fn == '|') { + fn += 1; + while (isspace(*fn)) fn += 1; +#ifndef _WIN32 + osp = popen(fn, "w"); +#else + osp = _popen(fn, "w"); +#endif + if (!osp) { + fprintf(stderr, "inkscape: popen(%s): %s\n", + fn, strerror(errno)); + return false; + } + _stream = osp; + } else if (*fn == '>') { + fn += 1; + while (isspace(*fn)) fn += 1; + Inkscape::IO::dump_fopen_call(fn, "K"); + osf = Inkscape::IO::fopen_utf8name(fn, "w+"); + if (!osf) { + fprintf(stderr, "inkscape: fopen(%s): %s\n", + fn, strerror(errno)); + return false; + } + _stream = osf; + } else { + /* put cwd stuff in here */ + gchar *qn = ( *fn + ? g_strdup_printf("lpr -P %s", fn) /* FIXME: quote fn */ + : g_strdup("lpr") ); +#ifndef _WIN32 + osp = popen(qn, "w"); +#else + osp = _popen(qn, "w"); +#endif + if (!osp) { + fprintf(stderr, "inkscape: popen(%s): %s\n", + qn, strerror(errno)); + return false; + } + g_free(qn); + _stream = osp; + } + } + + g_free(local_fn); + + if (_stream) { + /* fixme: this is kinda icky */ +#if !defined(_WIN32) && !defined(__WIN32__) + (void) signal(SIGPIPE, SIG_IGN); +#endif + } + + return true; +} + +void CairoRenderContext::setPSLevel(unsigned int level) +{ + _ps_level = level; +} + +void CairoRenderContext::setEPS(bool eps) +{ + _eps = eps; +} + +unsigned int CairoRenderContext::getPSLevel() +{ + return _ps_level; +} + +void CairoRenderContext::setPDFLevel(unsigned int level) +{ + _pdf_level = level; +} + +void CairoRenderContext::setTextToPath(bool texttopath) +{ + _is_texttopath = texttopath; +} + +void CairoRenderContext::setOmitText(bool omittext) +{ + _is_omittext = omittext; +} + +bool CairoRenderContext::getOmitText() +{ + return _is_omittext; +} + +void CairoRenderContext::setFilterToBitmap(bool filtertobitmap) +{ + _is_filtertobitmap = filtertobitmap; +} + +bool CairoRenderContext::getFilterToBitmap() +{ + return _is_filtertobitmap; +} + +void CairoRenderContext::setBitmapResolution(int resolution) +{ + _bitmapresolution = resolution; +} + +int CairoRenderContext::getBitmapResolution() +{ + return _bitmapresolution; +} + +cairo_surface_t* +CairoRenderContext::getSurface() +{ + g_assert( _is_valid ); + + return _surface; +} + +bool +CairoRenderContext::saveAsPng(const char *file_name) +{ + cairo_status_t status = cairo_surface_write_to_png(_surface, file_name); + if (status) + return false; + else + return true; +} + +void +CairoRenderContext::setRenderMode(CairoRenderMode mode) +{ + switch (mode) { + case RENDER_MODE_NORMAL: + case RENDER_MODE_CLIP: + _render_mode = mode; + break; + default: + _render_mode = RENDER_MODE_NORMAL; + break; + } +} + +CairoRenderContext::CairoRenderMode +CairoRenderContext::getRenderMode() const +{ + return _render_mode; +} + +void +CairoRenderContext::setClipMode(CairoClipMode mode) +{ + switch (mode) { + case CLIP_MODE_PATH: // Clip is rendered as a path for vector output + case CLIP_MODE_MASK: // Clip is rendered as a bitmap for raster output. + _clip_mode = mode; + break; + default: + _clip_mode = CLIP_MODE_PATH; + break; + } +} + +CairoRenderContext::CairoClipMode +CairoRenderContext::getClipMode() const +{ + return _clip_mode; +} + +CairoRenderState* CairoRenderContext::_createState() +{ + CairoRenderState *state = static_cast<CairoRenderState*>(g_try_malloc(sizeof(CairoRenderState))); + g_assert( state != nullptr ); + + state->has_filtereffect = FALSE; + state->merge_opacity = TRUE; + state->opacity = 1.0; + state->need_layer = FALSE; + state->has_overflow = FALSE; + state->parent_has_userspace = FALSE; + state->clip_path = nullptr; + state->mask = nullptr; + + return state; +} + +void CairoRenderContext::pushLayer() +{ + g_assert( _is_valid ); + + TRACE(("--pushLayer\n")); + cairo_push_group(_cr); + + // clear buffer + if (!_vector_based_target) { + cairo_save(_cr); + cairo_set_operator(_cr, CAIRO_OPERATOR_CLEAR); + cairo_paint(_cr); + cairo_restore(_cr); + } +} + +void +CairoRenderContext::popLayer(cairo_operator_t composite) +{ + g_assert( _is_valid ); + + float opacity = _state->opacity; + TRACE(("--popLayer w/ opacity %f\n", opacity)); + + /* + At this point, the Cairo source is ready. A Cairo mask must be created if required. + Care must be taken of transformatons as Cairo, like PS and PDF, treats clip paths and + masks independently of the objects they effect while in SVG the clip paths and masks + are defined relative to the objects they are attached to. + Notes: + 1. An SVG object may have both a clip path and a mask! + 2. An SVG clip path can be composed of an object with a clip path. This is not handled properly. + 3. An SVG clipped or masked object may be first drawn off the page and then translated onto + the page (document). This is also not handled properly. + 4. The code converts all SVG masks to bitmaps. This shouldn't be necessary. + 5. Cairo expects a mask to use only the alpha channel. SVG masks combine the RGB luminance with + alpha. This is handled here by doing a pixel by pixel conversion. + */ + + SPClipPath *clip_path = _state->clip_path; + SPMask *mask = _state->mask; + if (clip_path || mask) { + + CairoRenderContext *clip_ctx = nullptr; + cairo_surface_t *clip_mask = nullptr; + + // Apply any clip path first + if (clip_path) { + TRACE((" Applying clip\n")); + if (_render_mode == RENDER_MODE_CLIP) + mask = nullptr; // disable mask when performing nested clipping + + if (_vector_based_target) { + setClipMode(CLIP_MODE_PATH); // Vector + if (!mask) { + cairo_pop_group_to_source(_cr); + _renderer->applyClipPath(this, clip_path); // Uses cairo_clip() + if (opacity == 1.0) + cairo_paint(_cr); + else + cairo_paint_with_alpha(_cr, opacity); + + } else { + // the clipPath will be applied before masking + } + } else { + + // setup a new rendering context + clip_ctx = _renderer->createContext(); + clip_ctx->setImageTarget(CAIRO_FORMAT_A8); + clip_ctx->setClipMode(CLIP_MODE_MASK); // Raster + // This code ties the clipping to the document coordinates. It doesn't allow + // for a clipped object initially drawn off the page and then translated onto + // the page. + if (!clip_ctx->setupSurface(_width, _height)) { + TRACE(("clip: setupSurface failed\n")); + _renderer->destroyContext(clip_ctx); + return; + } + + // clear buffer + cairo_save(clip_ctx->_cr); + cairo_set_operator(clip_ctx->_cr, CAIRO_OPERATOR_CLEAR); + cairo_paint(clip_ctx->_cr); + cairo_restore(clip_ctx->_cr); + + // If a mask won't be applied set opacity too. (The clip is represented by a solid Cairo mask.) + if (!mask) + cairo_set_source_rgba(clip_ctx->_cr, 1.0, 1.0, 1.0, opacity); + else + cairo_set_source_rgba(clip_ctx->_cr, 1.0, 1.0, 1.0, 1.0); + + // copy over the correct CTM + // It must be stored in item_transform of current state after pushState. + Geom::Affine item_transform; + if (_state->parent_has_userspace) + item_transform = getParentState()->transform * _state->item_transform; + else + item_transform = _state->item_transform; + + // apply the clip path + clip_ctx->pushState(); + clip_ctx->getCurrentState()->item_transform = item_transform; + _renderer->applyClipPath(clip_ctx, clip_path); + clip_ctx->popState(); + + clip_mask = clip_ctx->getSurface(); + TEST(clip_ctx->saveAsPng("clip_mask.png")); + + if (!mask) { + cairo_pop_group_to_source(_cr); + if (composite != CAIRO_OPERATOR_CLEAR){ + cairo_set_operator(_cr, composite); + } + cairo_mask_surface(_cr, clip_mask, 0, 0); + _renderer->destroyContext(clip_ctx); + } + } + } + + // Apply any mask second + if (mask) { + TRACE((" Applying mask\n")); + // create rendering context for mask + CairoRenderContext *mask_ctx = _renderer->createContext(); + + // Fix Me: This is a kludge. PDF and PS output is set to 72 dpi but the + // Cairo surface is expecting the mask to be 96 dpi. + float surface_width = _width; + float surface_height = _height; + if( _vector_based_target ) { + surface_width *= 4.0/3.0; + surface_height *= 4.0/3.0; + } + if (!mask_ctx->setupSurface( surface_width, surface_height )) { + TRACE(("mask: setupSurface failed\n")); + _renderer->destroyContext(mask_ctx); + return; + } + TRACE(("mask surface: %f x %f at %i dpi\n", surface_width, surface_height, _dpi )); + + // Mask should start black, but it is created white. + cairo_set_source_rgba(mask_ctx->_cr, 0.0, 0.0, 0.0, 1.0); + cairo_rectangle(mask_ctx->_cr, 0, 0, surface_width, surface_height); + cairo_fill(mask_ctx->_cr); + + // set rendering mode to normal + setRenderMode(RENDER_MODE_NORMAL); + + // copy the correct CTM to mask context + /* + if (_state->parent_has_userspace) + mask_ctx->setTransform(getParentState()->transform); + else + mask_ctx->setTransform(_state->transform); + */ + // This is probably not correct... but it seems to do the trick. + mask_ctx->setTransform(_state->item_transform); + + // render mask contents to mask_ctx + _renderer->applyMask(mask_ctx, mask); + + TEST(mask_ctx->saveAsPng("mask.png")); + + // composite with clip mask + if (clip_path && _clip_mode == CLIP_MODE_MASK) { + cairo_mask_surface(mask_ctx->_cr, clip_mask, 0, 0); + _renderer->destroyContext(clip_ctx); + } + + cairo_surface_t *mask_image = mask_ctx->getSurface(); + int width = cairo_image_surface_get_width(mask_image); + int height = cairo_image_surface_get_height(mask_image); + int stride = cairo_image_surface_get_stride(mask_image); + unsigned char *pixels = cairo_image_surface_get_data(mask_image); + + // In SVG, the rgb channels as well as the alpha channel is used in masking. + // In Cairo, only the alpha channel is used thus requiring this conversion. + // SVG specifies that RGB be converted to alpha using luminance-to-alpha. + // Notes: This calculation assumes linear RGB values. VERIFY COLOR SPACE! + // The incoming pixel values already include alpha, fill-opacity, etc., + // however, opacity must still be applied. + TRACE(("premul w/ %f\n", opacity)); + const float coeff_r = 0.2125 / 255.0; + const float coeff_g = 0.7154 / 255.0; + const float coeff_b = 0.0721 / 255.0; + for (int row = 0 ; row < height; row++) { + unsigned char *row_data = pixels + (row * stride); + for (int i = 0 ; i < width; i++) { + guint32 *pixel = reinterpret_cast<guint32 *>(row_data) + i; + float lum_alpha = (((*pixel & 0x00ff0000) >> 16) * coeff_r + + ((*pixel & 0x0000ff00) >> 8) * coeff_g + + ((*pixel & 0x000000ff) ) * coeff_b ); + // lum_alpha can be slightly greater than 1 due to rounding errors... + // but this should be OK since it doesn't matter what the lower + // six hexadecimal numbers of *pixel are. + *pixel = (guint32)(0xff000000 * lum_alpha * opacity); + } + } + + cairo_pop_group_to_source(_cr); + if (composite != CAIRO_OPERATOR_CLEAR){ + cairo_set_operator(_cr, composite); + } + if (_clip_mode == CLIP_MODE_PATH) { + // we have to do the clipping after cairo_pop_group_to_source + _renderer->applyClipPath(this, clip_path); + } + // apply the mask onto the layer + cairo_mask_surface(_cr, mask_image, 0, 0); + _renderer->destroyContext(mask_ctx); + } + } else { + // No clip path or mask + cairo_pop_group_to_source(_cr); + if (composite != CAIRO_OPERATOR_CLEAR){ + cairo_set_operator(_cr, composite); + } + if (opacity == 1.0) + cairo_paint(_cr); + else + cairo_paint_with_alpha(_cr, opacity); + } +} +void CairoRenderContext::tagBegin(const char* l){ +#if CAIRO_VERSION >= CAIRO_VERSION_ENCODE(1, 15, 4) + char* link = g_strdup_printf("uri='%s'", l); + cairo_tag_begin(_cr, CAIRO_TAG_LINK, link); + g_free(link); +#endif +} + +void CairoRenderContext::tagEnd(){ +#if CAIRO_VERSION >= CAIRO_VERSION_ENCODE(1, 15, 4) + cairo_tag_end(_cr, CAIRO_TAG_LINK); +#endif +} + + +void +CairoRenderContext::addClipPath(Geom::PathVector const &pv, SPIEnum<SPWindRule> const *fill_rule) +{ + g_assert( _is_valid ); + + // here it should be checked whether the current clip winding changed + // so we could switch back to masked clipping + if (fill_rule->value == SP_WIND_RULE_EVENODD) { + cairo_set_fill_rule(_cr, CAIRO_FILL_RULE_EVEN_ODD); + } else { + cairo_set_fill_rule(_cr, CAIRO_FILL_RULE_WINDING); + } + addPathVector(pv); +} + +void +CairoRenderContext::addClippingRect(double x, double y, double width, double height) +{ + g_assert( _is_valid ); + + cairo_rectangle(_cr, x, y, width, height); + cairo_clip(_cr); +} + +bool +CairoRenderContext::setupSurface(double width, double height) +{ + // Is the surface already set up? + if (_is_valid) + return true; + + if (_vector_based_target && _stream == nullptr) + return false; + + _width = width; + _height = height; + + cairo_surface_t *surface = nullptr; + cairo_matrix_t ctm; + cairo_matrix_init_identity (&ctm); + switch (_target) { + case CAIRO_SURFACE_TYPE_IMAGE: + surface = cairo_image_surface_create(_target_format, (int)ceil(width), (int)ceil(height)); + break; +#ifdef CAIRO_HAS_PDF_SURFACE + case CAIRO_SURFACE_TYPE_PDF: + surface = cairo_pdf_surface_create_for_stream(Inkscape::Extension::Internal::_write_callback, _stream, width, height); + cairo_pdf_surface_restrict_to_version(surface, (cairo_pdf_version_t)_pdf_level); + break; +#endif +#ifdef CAIRO_HAS_PS_SURFACE + case CAIRO_SURFACE_TYPE_PS: + surface = cairo_ps_surface_create_for_stream(Inkscape::Extension::Internal::_write_callback, _stream, width, height); + if(CAIRO_STATUS_SUCCESS != cairo_surface_status(surface)) { + return FALSE; + } + cairo_ps_surface_restrict_to_level(surface, (cairo_ps_level_t)_ps_level); + cairo_ps_surface_set_eps(surface, (cairo_bool_t) _eps); + break; +#endif + default: + return false; + break; + } + + _setSurfaceMetadata(surface); + + return _finishSurfaceSetup (surface, &ctm); +} + +bool +CairoRenderContext::setSurfaceTarget(cairo_surface_t *surface, bool is_vector, cairo_matrix_t *ctm) +{ + if (_is_valid || !surface) + return false; + + _vector_based_target = is_vector; + bool ret = _finishSurfaceSetup (surface, ctm); + if (ret) + cairo_surface_reference (surface); + return ret; +} + +bool +CairoRenderContext::_finishSurfaceSetup(cairo_surface_t *surface, cairo_matrix_t *ctm) +{ + if(surface == nullptr) { + return false; + } + if(CAIRO_STATUS_SUCCESS != cairo_surface_status(surface)) { + return false; + } + + _cr = cairo_create(surface); + if(CAIRO_STATUS_SUCCESS != cairo_status(_cr)) { + return false; + } + if (ctm) + cairo_set_matrix(_cr, ctm); + _surface = surface; + + if (_vector_based_target) { + cairo_scale(_cr, Inkscape::Util::Quantity::convert(1, "px", "pt"), Inkscape::Util::Quantity::convert(1, "px", "pt")); + } else if (cairo_surface_get_content(_surface) != CAIRO_CONTENT_ALPHA) { + // set background color on non-alpha surfaces + // TODO: bgcolor should be derived from SPDocument (see IconImpl) + cairo_set_source_rgb(_cr, 1.0, 1.0, 1.0); + cairo_rectangle(_cr, 0, 0, _width, _height); + cairo_fill(_cr); + } + + _is_valid = TRUE; + + return true; +} + +void +CairoRenderContext::_setSurfaceMetadata(cairo_surface_t *surface) +{ + switch (_target) { +#if defined CAIRO_HAS_PDF_SURFACE && CAIRO_VERSION >= CAIRO_VERSION_ENCODE(1, 15, 4) + case CAIRO_SURFACE_TYPE_PDF: + if (!_metadata.title.empty()) { + cairo_pdf_surface_set_metadata(surface, CAIRO_PDF_METADATA_TITLE, _metadata.title.c_str()); + } + if (!_metadata.author.empty()) { + cairo_pdf_surface_set_metadata(surface, CAIRO_PDF_METADATA_AUTHOR, _metadata.author.c_str()); + } + if (!_metadata.subject.empty()) { + cairo_pdf_surface_set_metadata(surface, CAIRO_PDF_METADATA_SUBJECT, _metadata.subject.c_str()); + } + if (!_metadata.keywords.empty()) { + cairo_pdf_surface_set_metadata(surface, CAIRO_PDF_METADATA_KEYWORDS, _metadata.keywords.c_str()); + } + if (!_metadata.creator.empty()) { + cairo_pdf_surface_set_metadata(surface, CAIRO_PDF_METADATA_CREATOR, _metadata.creator.c_str()); + } + if (!_metadata.cdate.empty()) { + cairo_pdf_surface_set_metadata(surface, CAIRO_PDF_METADATA_CREATE_DATE, _metadata.cdate.c_str()); + } + if (!_metadata.mdate.empty()) { + cairo_pdf_surface_set_metadata(surface, CAIRO_PDF_METADATA_MOD_DATE, _metadata.mdate.c_str()); + } + break; +#endif +#if defined CAIRO_HAS_PS_SURFACE + case CAIRO_SURFACE_TYPE_PS: + if (!_metadata.title.empty()) { + cairo_ps_surface_dsc_comment(surface, (Glib::ustring("%%Title: ") + _metadata.title).c_str()); + } + if (!_metadata.copyright.empty()) { + cairo_ps_surface_dsc_comment(surface, (Glib::ustring("%%Copyright: ") + _metadata.copyright).c_str()); + } + break; +#endif + default: + g_warning("unsupported target %d\n", _target); + } +} + +/** + * Each page that's made should call finishPage to complete it. + */ +bool +CairoRenderContext::finishPage() +{ + g_assert(_is_valid); + if (!_vector_based_target) + return false; + + // Protect against finish() showing one too many pages. + if (!_is_show_page) { + cairo_show_page(_cr); + _is_show_page = true; + } + + auto status = cairo_status(_cr); + if (status != CAIRO_STATUS_SUCCESS) { + g_critical("error while rendering page: %s", cairo_status_to_string(status)); + return false; + } + return true; +} + +/** + * When writing multiple pages, resize the next page. + */ +bool +CairoRenderContext::nextPage(double width, double height, char const *label) +{ + g_assert(_is_valid); + if (!_vector_based_target) + return false; + + _width = width; + _height = height; + _is_show_page = false; + cairo_pdf_surface_set_size(_surface, width, height); + + if (label) { + cairo_pdf_surface_set_page_label(_surface, label); + } + + auto status = cairo_surface_status(_surface); + if (status != CAIRO_STATUS_SUCCESS) { + g_critical("error while sizing page: %s", cairo_status_to_string(status)); + return false; + } + return true; +} + + +bool +CairoRenderContext::finish(bool finish_surface) +{ + g_assert( _is_valid ); + + if (_vector_based_target && !_is_show_page && finish_surface) + cairo_show_page(_cr); + + cairo_status_t status = cairo_status(_cr); + if (status != CAIRO_STATUS_SUCCESS) + g_critical("error while rendering output: %s", cairo_status_to_string(status)); + + cairo_destroy(_cr); + _cr = nullptr; + + if (finish_surface) + cairo_surface_finish(_surface); + status = cairo_surface_status(_surface); + cairo_surface_destroy(_surface); + _surface = nullptr; + + if (_layout) + g_object_unref(_layout); + + _is_valid = FALSE; + + if (_vector_based_target && _stream) { + /* Flush stream to be sure. */ + (void) fflush(_stream); + + fclose(_stream); + _stream = nullptr; + } + + if (status == CAIRO_STATUS_SUCCESS) + return true; + else + return false; +} + +void +CairoRenderContext::transform(Geom::Affine const &transform) +{ + g_assert( _is_valid ); + + cairo_matrix_t matrix; + _initCairoMatrix(&matrix, transform); + cairo_transform(_cr, &matrix); + + // store new CTM + _state->transform = getTransform(); +} + +void +CairoRenderContext::setTransform(Geom::Affine const &transform) +{ + g_assert( _is_valid ); + + cairo_matrix_t matrix; + _initCairoMatrix(&matrix, transform); + cairo_set_matrix(_cr, &matrix); + _state->transform = transform; +} + +Geom::Affine CairoRenderContext::getTransform() const +{ + g_assert( _is_valid ); + + cairo_matrix_t ctm; + cairo_get_matrix(_cr, &ctm); + Geom::Affine ret; + ret[0] = ctm.xx; + ret[1] = ctm.yx; + ret[2] = ctm.xy; + ret[3] = ctm.yy; + ret[4] = ctm.x0; + ret[5] = ctm.y0; + return ret; +} + +Geom::Affine CairoRenderContext::getParentTransform() const +{ + g_assert( _is_valid ); + + CairoRenderState *parent_state = getParentState(); + return parent_state->transform; +} + +void CairoRenderContext::pushState() +{ + g_assert( _is_valid ); + + cairo_save(_cr); + + CairoRenderState *new_state = _createState(); + // copy current state's transform + new_state->transform = _state->transform; + _state_stack.push_back(new_state); + _state = new_state; +} + +void CairoRenderContext::popState() +{ + g_assert( _is_valid ); + + cairo_restore(_cr); + + g_free(_state_stack.back()); + _state_stack.pop_back(); + + g_assert( !_state_stack.empty()); + _state = _state_stack.back(); +} + +static bool pattern_hasItemChildren(SPPattern *pat) +{ + for (auto& child: pat->children) { + if (SP_IS_ITEM (&child)) { + return true; + } + } + return false; +} + +cairo_pattern_t* +CairoRenderContext::_createPatternPainter(SPPaintServer const *const paintserver, Geom::OptRect const &pbox) +{ + g_assert( SP_IS_PATTERN(paintserver) ); + + SPPattern *pat = SP_PATTERN (paintserver); + + Geom::Affine ps2user, pcs2dev; + ps2user = Geom::identity(); + pcs2dev = Geom::identity(); + + double x = pat->x(); + double y = pat->y(); + double width = pat->width(); + double height = pat->height(); + double bbox_width_scaler; + double bbox_height_scaler; + + TRACE(("%f x %f pattern\n", width, height)); + + if (pbox && pat->patternUnits() == SPPattern::UNITS_OBJECTBOUNDINGBOX) { + bbox_width_scaler = pbox->width(); + bbox_height_scaler = pbox->height(); + ps2user[4] = x * bbox_width_scaler + pbox->left(); + ps2user[5] = y * bbox_height_scaler + pbox->top(); + } else { + bbox_width_scaler = 1.0; + bbox_height_scaler = 1.0; + ps2user[4] = x; + ps2user[5] = y; + } + + // apply pattern transformation + Geom::Affine pattern_transform(pat->getTransform()); + ps2user *= pattern_transform; + Geom::Point ori (ps2user[4], ps2user[5]); + + // create pattern contents coordinate system + if (pat->viewBox_set) { + Geom::Rect view_box = *pat->viewbox(); + + double x, y, w, h; + x = 0; + y = 0; + w = width * bbox_width_scaler; + h = height * bbox_height_scaler; + + //calculatePreserveAspectRatio(pat->aspect_align, pat->aspect_clip, view_width, view_height, &x, &y, &w, &h); + pcs2dev[0] = w / view_box.width(); + pcs2dev[3] = h / view_box.height(); + pcs2dev[4] = x - view_box.left() * pcs2dev[0]; + pcs2dev[5] = y - view_box.top() * pcs2dev[3]; + } else if (pbox && pat->patternContentUnits() == SPPattern::UNITS_OBJECTBOUNDINGBOX) { + pcs2dev[0] = pbox->width(); + pcs2dev[3] = pbox->height(); + } + + // Calculate the size of the surface which has to be created +#define SUBPIX_SCALE 100 + // Cairo requires an integer pattern surface width/height. + // Subtract 0.5 to prevent small rounding errors from increasing pattern size by one pixel. + // Multiply by SUBPIX_SCALE to allow for less than a pixel precision + double surface_width = MAX(ceil(SUBPIX_SCALE * bbox_width_scaler * width - 0.5), 1); + double surface_height = MAX(ceil(SUBPIX_SCALE * bbox_height_scaler * height - 0.5), 1); + TRACE(("pattern surface size: %f x %f\n", surface_width, surface_height)); + // create new rendering context + CairoRenderContext *pattern_ctx = cloneMe(surface_width, surface_height); + + // adjust the size of the painted pattern to fit exactly the created surface + // this has to be done because of the rounding to obtain an integer pattern surface width/height + double scale_width = surface_width / (bbox_width_scaler * width); + double scale_height = surface_height / (bbox_height_scaler * height); + if (scale_width != 1.0 || scale_height != 1.0 || _vector_based_target) { + TRACE(("needed to scale with %f %f\n", scale_width, scale_height)); + pcs2dev *= Geom::Scale(SUBPIX_SCALE,SUBPIX_SCALE); + ps2user *= Geom::Scale(1.0/SUBPIX_SCALE,1.0/SUBPIX_SCALE); + } + + // despite scaling up/down by subpixel scaler, the origin point of the pattern must be the same + ps2user[4] = ori[Geom::X]; + ps2user[5] = ori[Geom::Y]; + + pattern_ctx->setTransform(pcs2dev); + pattern_ctx->pushState(); + + // create drawing and group + Inkscape::Drawing drawing; + unsigned dkey = SPItem::display_key_new(1); + + // show items and render them + for (SPPattern *pat_i = pat; pat_i != nullptr; pat_i = pat_i->ref ? pat_i->ref->getObject() : nullptr) { + if (pat_i && pattern_hasItemChildren(pat_i)) { // find the first one with item children + for (auto& child: pat_i->children) { + if (SP_IS_ITEM(&child)) { + SP_ITEM(&child)->invoke_show(drawing, dkey, SP_ITEM_REFERENCE_FLAGS); + _renderer->renderItem(pattern_ctx, SP_ITEM(&child)); + } + } + break; // do not go further up the chain if children are found + } + } + + pattern_ctx->popState(); + + // setup a cairo_pattern_t + cairo_surface_t *pattern_surface = pattern_ctx->getSurface(); + TEST(pattern_ctx->saveAsPng("pattern.png")); + cairo_pattern_t *result = cairo_pattern_create_for_surface(pattern_surface); + cairo_pattern_set_extend(result, CAIRO_EXTEND_REPEAT); + + // set pattern transformation + cairo_matrix_t pattern_matrix; + _initCairoMatrix(&pattern_matrix, ps2user); + cairo_matrix_invert(&pattern_matrix); + cairo_pattern_set_matrix(result, &pattern_matrix); + + delete pattern_ctx; + + // hide all items + for (SPPattern *pat_i = pat; pat_i != nullptr; pat_i = pat_i->ref ? pat_i->ref->getObject() : nullptr) { + if (pat_i && pattern_hasItemChildren(pat_i)) { // find the first one with item children + for (auto& child: pat_i->children) { + if (SP_IS_ITEM(&child)) { + SP_ITEM(&child)->invoke_hide(dkey); + } + } + break; // do not go further up the chain if children are found + } + } + + return result; +} + +cairo_pattern_t* +CairoRenderContext::_createHatchPainter(SPPaintServer const *const paintserver, Geom::OptRect const &pbox) { + SPHatch const *hatch = dynamic_cast<SPHatch const *>(paintserver); + g_assert( hatch ); + + g_assert(hatch->pitch() > 0); + + // create drawing and group + Inkscape::Drawing drawing; + unsigned dkey = SPItem::display_key_new(1); + + // TODO need to refactor 'evil' referenced code for const correctness. + SPHatch *evil = const_cast<SPHatch *>(hatch); + evil->show(drawing, dkey, pbox); + + SPHatch::RenderInfo render_info = hatch->calculateRenderInfo(dkey); + Geom::Rect tile_rect = render_info.tile_rect; + + // Cairo requires an integer pattern surface width/height. + // Subtract 0.5 to prevent small rounding errors from increasing pattern size by one pixel. + // Multiply by SUBPIX_SCALE to allow for less than a pixel precision + const int subpix_scale = 10; + double surface_width = MAX(ceil(subpix_scale * tile_rect.width() - 0.5), 1); + double surface_height = MAX(ceil(subpix_scale * tile_rect.height() - 0.5), 1); + Geom::Affine drawing_scale = Geom::Scale(surface_width / tile_rect.width(), surface_height / tile_rect.height()); + Geom::Affine drawing_transform = Geom::Translate(-tile_rect.min()) * drawing_scale; + + Geom::Affine child_transform = render_info.child_transform; + child_transform *= drawing_transform; + + //The rendering of hatch overflow is implemented by repeated drawing + //of hatch paths over one strip. Within each iteration paths are moved by pitch value. + //The movement progresses from right to left. This gives the same result + //as drawing whole strips in left-to-right order. + gdouble overflow_right_strip = 0.0; + int overflow_steps = 1; + Geom::Affine overflow_transform; + if (hatch->style->overflow.computed == SP_CSS_OVERFLOW_VISIBLE) { + Geom::Interval bounds = hatch->bounds(); + overflow_right_strip = floor(bounds.max() / hatch->pitch()) * hatch->pitch(); + overflow_steps = ceil((overflow_right_strip - bounds.min()) / hatch->pitch()) + 1; + overflow_transform = Geom::Translate(hatch->pitch(), 0.0); + } + + CairoRenderContext *pattern_ctx = cloneMe(surface_width, surface_height); + pattern_ctx->setTransform(child_transform); + pattern_ctx->transform(Geom::Translate(-overflow_right_strip, 0.0)); + pattern_ctx->pushState(); + + std::vector<SPHatchPath *> children(evil->hatchPaths()); + + for (int i = 0; i < overflow_steps; i++) { + for (auto path : children) { + _renderer->renderHatchPath(pattern_ctx, *path, dkey); + } + pattern_ctx->transform(overflow_transform); + } + + pattern_ctx->popState(); + + // setup a cairo_pattern_t + cairo_surface_t *pattern_surface = pattern_ctx->getSurface(); + TEST(pattern_ctx->saveAsPng("hatch.png")); + cairo_pattern_t *result = cairo_pattern_create_for_surface(pattern_surface); + cairo_pattern_set_extend(result, CAIRO_EXTEND_REPEAT); + + Geom::Affine pattern_transform; + pattern_transform = render_info.pattern_to_user_transform.inverse() * drawing_transform; + ink_cairo_pattern_set_matrix(result, pattern_transform); + + evil->hide(dkey); + + delete pattern_ctx; + return result; +} + +cairo_pattern_t* +CairoRenderContext::_createPatternForPaintServer(SPPaintServer const *const paintserver, + Geom::OptRect const &pbox, float alpha) +{ + cairo_pattern_t *pattern = nullptr; + bool apply_bbox2user = FALSE; + + auto const paintserver_mutable = const_cast<SPPaintServer *>(paintserver); + + if (auto lg = dynamic_cast<SPLinearGradient *>(paintserver_mutable)) { + + lg->ensureVector(); // when exporting from commandline, vector is not built + + Geom::Point p1 (lg->x1.computed, lg->y1.computed); + Geom::Point p2 (lg->x2.computed, lg->y2.computed); + if (pbox && lg->getUnits() == SP_GRADIENT_UNITS_OBJECTBOUNDINGBOX) { + // convert to userspace + Geom::Affine bbox2user(pbox->width(), 0, 0, pbox->height(), pbox->left(), pbox->top()); + p1 *= bbox2user; + p2 *= bbox2user; + } + + // create linear gradient pattern + pattern = cairo_pattern_create_linear(p1[Geom::X], p1[Geom::Y], p2[Geom::X], p2[Geom::Y]); + + // add stops + for (gint i = 0; unsigned(i) < lg->vector.stops.size(); i++) { + float rgb[3]; + lg->vector.stops[i].color.get_rgb_floatv(rgb); + cairo_pattern_add_color_stop_rgba(pattern, lg->vector.stops[i].offset, rgb[0], rgb[1], rgb[2], lg->vector.stops[i].opacity * alpha); + } + } else if (auto rg = dynamic_cast<SPRadialGradient *>(paintserver_mutable)) { + + rg->ensureVector(); // when exporting from commandline, vector is not built + + Geom::Point c (rg->cx.computed, rg->cy.computed); + Geom::Point f (rg->fx.computed, rg->fy.computed); + double r = rg->r.computed; + double fr = rg->fr.computed; + if (pbox && rg->getUnits() == SP_GRADIENT_UNITS_OBJECTBOUNDINGBOX) + apply_bbox2user = true; + + // create radial gradient pattern + pattern = cairo_pattern_create_radial(f[Geom::X], f[Geom::Y], fr, c[Geom::X], c[Geom::Y], r); + + // add stops + for (gint i = 0; unsigned(i) < rg->vector.stops.size(); i++) { + float rgb[3]; + rg->vector.stops[i].color.get_rgb_floatv(rgb); + cairo_pattern_add_color_stop_rgba(pattern, rg->vector.stops[i].offset, rgb[0], rgb[1], rgb[2], rg->vector.stops[i].opacity * alpha); + } + } else if (auto mg = dynamic_cast<SPMeshGradient *>(paintserver_mutable)) { + pattern = mg->pattern_new(_cr, pbox, 1.0); + } else if (SP_IS_PATTERN (paintserver)) { + pattern = _createPatternPainter(paintserver, pbox); + } else if ( dynamic_cast<SPHatch const *>(paintserver) ) { + pattern = _createHatchPainter(paintserver, pbox); + } else { + return nullptr; + } + + if (pattern && SP_IS_GRADIENT(paintserver)) { + auto g = dynamic_cast<SPGradient *>(paintserver_mutable); + + // set extend type + SPGradientSpread spread = g->fetchSpread(); + switch (spread) { + case SP_GRADIENT_SPREAD_REPEAT: { + cairo_pattern_set_extend(pattern, CAIRO_EXTEND_REPEAT); + break; + } + case SP_GRADIENT_SPREAD_REFLECT: { // not supported by cairo-pdf yet + cairo_pattern_set_extend(pattern, CAIRO_EXTEND_REFLECT); + break; + } + case SP_GRADIENT_SPREAD_PAD: { // not supported by cairo-pdf yet + cairo_pattern_set_extend(pattern, CAIRO_EXTEND_PAD); + break; + } + default: { + cairo_pattern_set_extend(pattern, CAIRO_EXTEND_NONE); + break; + } + } + + cairo_matrix_t pattern_matrix; + if (g->gradientTransform_set) { + // apply gradient transformation + cairo_matrix_init(&pattern_matrix, + g->gradientTransform[0], g->gradientTransform[1], + g->gradientTransform[2], g->gradientTransform[3], + g->gradientTransform[4], g->gradientTransform[5]); + } else { + cairo_matrix_init_identity (&pattern_matrix); + } + + if (apply_bbox2user) { + // convert to userspace + cairo_matrix_t bbox2user; + cairo_matrix_init (&bbox2user, pbox->width(), 0, 0, pbox->height(), pbox->left(), pbox->top()); + cairo_matrix_multiply (&pattern_matrix, &bbox2user, &pattern_matrix); + } + cairo_matrix_invert(&pattern_matrix); // because Cairo expects a userspace->patternspace matrix + cairo_pattern_set_matrix(pattern, &pattern_matrix); + } + + return pattern; +} + +void +CairoRenderContext::_setFillStyle(SPStyle const *const style, Geom::OptRect const &pbox) +{ + g_return_if_fail( !style->fill.set + || style->fill.isColor() + || style->fill.isPaintserver() ); + + float alpha = SP_SCALE24_TO_FLOAT(style->fill_opacity.value); + if (_state->merge_opacity) { + alpha *= _state->opacity; + TRACE(("merged op=%f\n", alpha)); + } + + SPPaintServer const *paint_server = style->getFillPaintServer(); + if (paint_server && paint_server->isValid()) { + + g_assert(SP_IS_GRADIENT(SP_STYLE_FILL_SERVER(style)) + || SP_IS_PATTERN(SP_STYLE_FILL_SERVER(style)) + || dynamic_cast<SPHatch *>(SP_STYLE_FILL_SERVER(style))); + + cairo_pattern_t *pattern = _createPatternForPaintServer(paint_server, pbox, alpha); + if (pattern) { + cairo_set_source(_cr, pattern); + cairo_pattern_destroy(pattern); + } + } else if (style->fill.colorSet) { + float rgb[3]; + style->fill.value.color.get_rgb_floatv(rgb); + + cairo_set_source_rgba(_cr, rgb[0], rgb[1], rgb[2], alpha); + + } else { // unset fill is black + g_assert(!style->fill.set + || (paint_server && !paint_server->isValid())); + + cairo_set_source_rgba(_cr, 0, 0, 0, alpha); + } +} + +void +CairoRenderContext::_setStrokeStyle(SPStyle const *style, Geom::OptRect const &pbox) +{ + float alpha = SP_SCALE24_TO_FLOAT(style->stroke_opacity.value); + if (_state->merge_opacity) + alpha *= _state->opacity; + + if (style->stroke.isColor() || (style->stroke.isPaintserver() && !style->getStrokePaintServer()->isValid())) { + float rgb[3]; + style->stroke.value.color.get_rgb_floatv(rgb); + + cairo_set_source_rgba(_cr, rgb[0], rgb[1], rgb[2], alpha); + } else { + g_assert( style->stroke.isPaintserver() + || SP_IS_GRADIENT(SP_STYLE_STROKE_SERVER(style)) + || SP_IS_PATTERN(SP_STYLE_STROKE_SERVER(style)) + || dynamic_cast<SPHatch *>(SP_STYLE_STROKE_SERVER(style))); + + cairo_pattern_t *pattern = _createPatternForPaintServer(SP_STYLE_STROKE_SERVER(style), pbox, alpha); + + if (pattern) { + cairo_set_source(_cr, pattern); + cairo_pattern_destroy(pattern); + } + } + + if (!style->stroke_dasharray.values.empty()) + { + size_t ndashes = style->stroke_dasharray.values.size(); + double* dashes =(double*)malloc(ndashes*sizeof(double)); + for( unsigned i = 0; i < ndashes; ++i ) { + dashes[i] = style->stroke_dasharray.values[i].value; + } + cairo_set_dash(_cr, dashes, ndashes, style->stroke_dashoffset.value); + free(dashes); + } else { + cairo_set_dash(_cr, nullptr, 0, 0.0); // disable dashing + } + + // This allows hairlines to be drawn properly in PDF, PS, Win32-Print, etc. + // It requires the following pull request in Cairo: + // https://gitlab.freedesktop.org/cairo/cairo/merge_requests/21 + if (style->stroke_extensions.hairline) { + ink_cairo_set_hairline(_cr); + } else { + cairo_set_line_width(_cr, style->stroke_width.computed); + } + + // set line join type + cairo_line_join_t join = CAIRO_LINE_JOIN_MITER; + switch (style->stroke_linejoin.computed) { + case SP_STROKE_LINEJOIN_MITER: + join = CAIRO_LINE_JOIN_MITER; + break; + case SP_STROKE_LINEJOIN_ROUND: + join = CAIRO_LINE_JOIN_ROUND; + break; + case SP_STROKE_LINEJOIN_BEVEL: + join = CAIRO_LINE_JOIN_BEVEL; + break; + } + cairo_set_line_join(_cr, join); + + // set line cap type + cairo_line_cap_t cap = CAIRO_LINE_CAP_BUTT; + switch (style->stroke_linecap.computed) { + case SP_STROKE_LINECAP_BUTT: + cap = CAIRO_LINE_CAP_BUTT; + break; + case SP_STROKE_LINECAP_ROUND: + cap = CAIRO_LINE_CAP_ROUND; + break; + case SP_STROKE_LINECAP_SQUARE: + cap = CAIRO_LINE_CAP_SQUARE; + break; + } + cairo_set_line_cap(_cr, cap); + cairo_set_miter_limit(_cr, MAX(1, style->stroke_miterlimit.value)); +} + +void +CairoRenderContext::_prepareRenderGraphic() +{ + // Only PDFLaTeX supports importing a single page of a graphics file, + // so only PDF backend gets interleaved text/graphics + if (_is_omittext && _target == CAIRO_SURFACE_TYPE_PDF && _render_mode != RENDER_MODE_CLIP) { + if (_omittext_state == NEW_PAGE_ON_GRAPHIC) { + // better set this immediately (not sure if masks applied during "popLayer" could call + // this function, too, triggering the same code again in error + _omittext_state = GRAPHIC_ON_TOP; + + // As we can not emit the page in the middle of a layer (aka group) - it will not be fully painted yet! - + // the following basically mirrors the calls in CairoRenderer::renderItem (but in reversed order) + // - first traverse all saved states in reversed order (i.e. from deepest nesting to the top) + // and apply clipping / masking to layers on the way (this is done in popLayer) + // - then emit the page using cairo_show_page() + // - finally restore the previous state with proper transforms and appropriate layers again + // + // TODO: While this appears to be an ugly hack it seems to work + // Somebody with a more intimate understanding of cairo and the renderer implementation might + // be able to implement this in a cleaner way, though. + int stack_size = _state_stack.size(); + for (int i = stack_size-1; i > 0; i--) { + if (_state_stack[i]->need_layer) + popLayer(); + cairo_restore(_cr); + _state = _state_stack[i-1]; + } + + cairo_show_page(_cr); + + for (int i = 1; i < stack_size; i++) { + cairo_save(_cr); + _state = _state_stack[i]; + if (_state->need_layer) + pushLayer(); + setTransform(_state->transform); + } + } + _omittext_state = GRAPHIC_ON_TOP; + } +} + +void +CairoRenderContext::_prepareRenderText() +{ + // Only PDFLaTeX supports importing a single page of a graphics file, + // so only PDF backend gets interleaved text/graphics + if (_is_omittext && _target == CAIRO_SURFACE_TYPE_PDF) { + if (_omittext_state == GRAPHIC_ON_TOP) + _omittext_state = NEW_PAGE_ON_GRAPHIC; + } +} + +/* We need CairoPaintOrder as markers are rendered in a separate step and may be rendered + * in between fill and stroke. + */ +bool +CairoRenderContext::renderPathVector(Geom::PathVector const & pathv, SPStyle const *style, Geom::OptRect const &pbox, CairoPaintOrder order) +{ + g_assert( _is_valid ); + + _prepareRenderGraphic(); + + if (_render_mode == RENDER_MODE_CLIP) { + if (_clip_mode == CLIP_MODE_PATH) { + addClipPath(pathv, &style->fill_rule); + } else { + setPathVector(pathv); + if (style->fill_rule.computed == SP_WIND_RULE_EVENODD) { + cairo_set_fill_rule(_cr, CAIRO_FILL_RULE_EVEN_ODD); + } else { + cairo_set_fill_rule(_cr, CAIRO_FILL_RULE_WINDING); + } + if (style->mix_blend_mode.set && style->mix_blend_mode.value) { + cairo_set_operator(_cr, ink_css_blend_to_cairo_operator(style->mix_blend_mode.value)); + } + cairo_fill(_cr); + TEST(cairo_surface_write_to_png (_surface, "pathmask.png")); + } + return true; + } + + bool no_fill = style->fill.isNone() || style->fill_opacity.value == 0 || + order == STROKE_ONLY; + bool no_stroke = style->stroke.isNone() || (!style->stroke_extensions.hairline && style->stroke_width.computed < 1e-9) || + style->stroke_opacity.value == 0 || order == FILL_ONLY; + + if (no_fill && no_stroke) + return true; + + bool need_layer = ( !_state->merge_opacity && !_state->need_layer && + ( _state->opacity != 1.0 || _state->clip_path != nullptr || _state->mask != nullptr ) ); + bool blend = false; + if (style->mix_blend_mode.set && style->mix_blend_mode.value != SP_CSS_BLEND_NORMAL) { + need_layer = true; + blend = true; + } + if (!need_layer) + cairo_save(_cr); + else + pushLayer(); + + if (!no_fill) { + if (style->fill_rule.computed == SP_WIND_RULE_EVENODD) { + cairo_set_fill_rule(_cr, CAIRO_FILL_RULE_EVEN_ODD); + } else { + cairo_set_fill_rule(_cr, CAIRO_FILL_RULE_WINDING); + } + } + + setPathVector(pathv); + + if (!no_fill && (order == STROKE_OVER_FILL || order == FILL_ONLY)) { + _setFillStyle(style, pbox); + + if (no_stroke) + cairo_fill(_cr); + else + cairo_fill_preserve(_cr); + } + + if (!no_stroke) { + _setStrokeStyle(style, pbox); + + if (no_fill || order == STROKE_OVER_FILL) + cairo_stroke(_cr); + else + cairo_stroke_preserve(_cr); + } + + if (!no_fill && order == FILL_OVER_STROKE) { + _setFillStyle(style, pbox); + + cairo_fill(_cr); + } + + if (need_layer) { + if (blend) { + popLayer(ink_css_blend_to_cairo_operator(style->mix_blend_mode.value)); + } else { + popLayer(); + } + } else { + cairo_restore(_cr); + } + + return true; +} + +bool CairoRenderContext::renderImage(Inkscape::Pixbuf *pb, + Geom::Affine const &image_transform, SPStyle const *style) +{ + g_assert( _is_valid ); + + if (_render_mode == RENDER_MODE_CLIP) { + return true; + } + + _prepareRenderGraphic(); + + int w = pb->width(); + int h = pb->height(); + + // TODO: reenable merge_opacity if useful + + cairo_surface_t *image_surface = pb->getSurfaceRaw(); + if (cairo_surface_status(image_surface)) { + TRACE(("Image surface creation failed:\n%s\n", cairo_status_to_string(cairo_surface_status(image_surface)))); + return false; + } + + cairo_save(_cr); + + // scaling by width & height is not needed because it will be done by Cairo + transform(image_transform); + + cairo_set_source_surface(_cr, image_surface, 0.0, 0.0); + + // set clip region so that the pattern will not be repeated (bug in Cairo-PDF) + if (_vector_based_target) { + cairo_new_path(_cr); + cairo_rectangle(_cr, 0, 0, w, h); + cairo_clip(_cr); + } + + // Cairo filter method will be mapped to PS/PDF 'interpolate' true/false). + // See cairo-pdf-surface.c + if (style) { + // See: http://www.w3.org/TR/SVG/painting.html#ImageRenderingProperty + // https://drafts.csswg.org/css-images-3/#the-image-rendering + // style.h/style.cpp, drawing-image.cpp + // + // CSS 3 defines: + // 'optimizeSpeed' as alias for "pixelated" + // 'optimizeQuality' as alias for "smooth" + switch (style->image_rendering.computed) { + 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: + cairo_pattern_set_filter(cairo_get_source(_cr), CAIRO_FILTER_NEAREST); + break; + case SP_CSS_IMAGE_RENDERING_OPTIMIZEQUALITY: + case SP_CSS_IMAGE_RENDERING_AUTO: + default: + cairo_pattern_set_filter(cairo_get_source(_cr), CAIRO_FILTER_BEST); + break; + } + } + + if (style->mix_blend_mode.set && style->mix_blend_mode.value) { + cairo_set_operator(_cr, ink_css_blend_to_cairo_operator(style->mix_blend_mode.value)); + } + + cairo_paint(_cr); + + cairo_restore(_cr); + return true; +} + +#define GLYPH_ARRAY_SIZE 64 + +// TODO investigate why the font is being ignored: +unsigned int CairoRenderContext::_showGlyphs(cairo_t *cr, PangoFont * /*font*/, std::vector<CairoGlyphInfo> const &glyphtext, bool path) +{ + cairo_glyph_t glyph_array[GLYPH_ARRAY_SIZE]; + cairo_glyph_t *glyphs = glyph_array; + unsigned int num_glyphs = glyphtext.size(); + if (num_glyphs > GLYPH_ARRAY_SIZE) { + glyphs = (cairo_glyph_t*)g_try_malloc(sizeof(cairo_glyph_t) * num_glyphs); + if(glyphs == nullptr) { + g_warning("CairorenderContext::_showGlyphs: can not allocate memory for %d glyphs.", num_glyphs); + return 0; + } + } + + unsigned int num_invalid_glyphs = 0; + unsigned int i = 0; // is a counter for indexing the glyphs array, only counts the valid glyphs + for (const auto & it_info : glyphtext) { + // skip glyphs which are PANGO_GLYPH_EMPTY (0x0FFFFFFF) + // or have the PANGO_GLYPH_UNKNOWN_FLAG (0x10000000) set + if (it_info.index == 0x0FFFFFFF || it_info.index & 0x10000000) { + TRACE(("INVALID GLYPH found\n")); + g_message("Invalid glyph found, continuing..."); + num_invalid_glyphs++; + continue; + } + glyphs[i].index = it_info.index; + glyphs[i].x = it_info.x; + glyphs[i].y = it_info.y; + i++; + } + + if (path) { + cairo_glyph_path(cr, glyphs, num_glyphs - num_invalid_glyphs); + } else { + cairo_show_glyphs(cr, glyphs, num_glyphs - num_invalid_glyphs); + } + + if (num_glyphs > GLYPH_ARRAY_SIZE) { + g_free(glyphs); + } + + return num_glyphs - num_invalid_glyphs; +} + +bool +CairoRenderContext::renderGlyphtext(PangoFont *font, Geom::Affine const &font_matrix, + std::vector<CairoGlyphInfo> const &glyphtext, SPStyle const *style) +{ + + _prepareRenderText(); + if (_is_omittext) + return true; + + // create a cairo_font_face from PangoFont + // double size = style->font_size.computed; /// \fixme why is this variable never used? + gpointer fonthash = (gpointer)font; + cairo_font_face_t *font_face = nullptr; + if(font_table.find(fonthash)!=font_table.end()) + font_face = font_table[fonthash]; + + FcPattern *fc_pattern = nullptr; + +#ifdef USE_PANGO_WIN32 +# ifdef CAIRO_HAS_WIN32_FONT + LOGFONTA *lfa = pango_win32_font_logfont(font); + LOGFONTW lfw; + + ZeroMemory(&lfw, sizeof(LOGFONTW)); + memcpy(&lfw, lfa, sizeof(LOGFONTA)); + MultiByteToWideChar(CP_OEMCP, MB_PRECOMPOSED, lfa->lfFaceName, LF_FACESIZE, lfw.lfFaceName, LF_FACESIZE); + + if(font_face == NULL) { + font_face = cairo_win32_font_face_create_for_logfontw(&lfw); + font_table[fonthash] = font_face; + } +# endif +#else +# ifdef CAIRO_HAS_FT_FONT + PangoFcFont *fc_font = PANGO_FC_FONT(font); + fc_pattern = fc_font->font_pattern; + if(font_face == nullptr) { + font_face = cairo_ft_font_face_create_for_pattern(fc_pattern); + font_table[fonthash] = font_face; + } +# endif +#endif + + cairo_save(_cr); + cairo_set_font_face(_cr, font_face); + + //if (fc_pattern && FcPatternGetDouble(fc_pattern, FC_PIXEL_SIZE, 0, &size) != FcResultMatch) + // size = 12.0; + + // set the given font matrix + cairo_matrix_t matrix; + _initCairoMatrix(&matrix, font_matrix); + cairo_set_font_matrix(_cr, &matrix); + + if (_render_mode == RENDER_MODE_CLIP) { + if (_clip_mode == CLIP_MODE_MASK) { + if (style->fill_rule.computed == SP_WIND_RULE_EVENODD) { + cairo_set_fill_rule(_cr, CAIRO_FILL_RULE_EVEN_ODD); + } else { + cairo_set_fill_rule(_cr, CAIRO_FILL_RULE_WINDING); + } + _showGlyphs(_cr, font, glyphtext, FALSE); + } else { + // just add the glyph paths to the current context + _showGlyphs(_cr, font, glyphtext, TRUE); + } + } else { + + bool fill = false; + if (style->fill.isColor() || style->fill.isPaintserver()) { + fill = true; + } + + bool stroke = false; + if (style->stroke.isColor() || style->stroke.isPaintserver()) { + stroke = true; + } + + if (style->mix_blend_mode.set && style->mix_blend_mode.value) { + cairo_set_operator(_cr, ink_css_blend_to_cairo_operator(style->mix_blend_mode.value)); + } + + // Text never has markers + bool stroke_over_fill = true; + if ( (style->paint_order.layer[0] == SP_CSS_PAINT_ORDER_STROKE && + style->paint_order.layer[1] == SP_CSS_PAINT_ORDER_FILL) || + + (style->paint_order.layer[0] == SP_CSS_PAINT_ORDER_STROKE && + style->paint_order.layer[2] == SP_CSS_PAINT_ORDER_FILL) || + + (style->paint_order.layer[1] == SP_CSS_PAINT_ORDER_STROKE && + style->paint_order.layer[2] == SP_CSS_PAINT_ORDER_FILL) ) { + stroke_over_fill = false; + } + + bool have_path = false; + if (fill && stroke_over_fill) { + _setFillStyle(style, Geom::OptRect()); + if (_is_texttopath) { + _showGlyphs(_cr, font, glyphtext, true); + if (stroke) { + cairo_fill_preserve(_cr); + have_path = true; + } else { + cairo_fill(_cr); + } + } else { + _showGlyphs(_cr, font, glyphtext, false); + } + } + + if (stroke) { + _setStrokeStyle(style, Geom::OptRect()); + if (!have_path) { + _showGlyphs(_cr, font, glyphtext, true); + } + if (fill && _is_texttopath && !stroke_over_fill) { + cairo_stroke_preserve(_cr); + have_path = true; + } else { + cairo_stroke(_cr); + } + } + + if (fill && !stroke_over_fill) { + _setFillStyle(style, Geom::OptRect()); + if (_is_texttopath) { + if (!have_path) { + // Could happen if both 'stroke' and 'stroke_over_fill' are false + _showGlyphs(_cr, font, glyphtext, true); + } + cairo_fill(_cr); + } else { + _showGlyphs(_cr, font, glyphtext, false); + } + } + + } + + cairo_restore(_cr); + +// if (font_face) +// cairo_font_face_destroy(font_face); + + return true; +} + +/* Helper functions */ + +void +CairoRenderContext::setPathVector(Geom::PathVector const &pv) +{ + cairo_new_path(_cr); + addPathVector(pv); +} + +void +CairoRenderContext::addPathVector(Geom::PathVector const &pv) +{ + feed_pathvector_to_cairo(_cr, pv); +} + +void +CairoRenderContext::_concatTransform(cairo_t *cr, double xx, double yx, double xy, double yy, double x0, double y0) +{ + cairo_matrix_t matrix; + + cairo_matrix_init(&matrix, xx, yx, xy, yy, x0, y0); + cairo_transform(cr, &matrix); +} + +void +CairoRenderContext::_initCairoMatrix(cairo_matrix_t *matrix, Geom::Affine const &transform) +{ + matrix->xx = transform[0]; + matrix->yx = transform[1]; + matrix->xy = transform[2]; + matrix->yy = transform[3]; + matrix->x0 = transform[4]; + matrix->y0 = transform[5]; +} + +void +CairoRenderContext::_concatTransform(cairo_t *cr, Geom::Affine const &transform) +{ + _concatTransform(cr, transform[0], transform[1], + transform[2], transform[3], + transform[4], transform[5]); +} + +static cairo_status_t +_write_callback(void *closure, const unsigned char *data, unsigned int length) +{ + size_t written; + FILE *file = (FILE*)closure; + + written = fwrite (data, 1, length, file); + + if (written == length) + return CAIRO_STATUS_SUCCESS; + else + return CAIRO_STATUS_WRITE_ERROR; +} + +#include "clear-n_.h" + +} /* namespace Internal */ +} /* namespace Extension */ +} /* namespace Inkscape */ + +#undef TRACE +#undef TEST + + +/* + 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 : |