1 #define __SP_CAIRO_RENDERER_C__
3 /** \file
4 * Rendering with Cairo.
5 */
6 /*
7 * Author:
8 * Miklos Erdelyi <erdelyim@gmail.com>
9 *
10 * Copyright (C) 2006 Miklos Erdelyi
11 *
12 * Licensed under GNU GPL
13 */
15 #ifdef HAVE_CONFIG_H
16 # include "config.h"
17 #endif
19 #ifndef PANGO_ENABLE_BACKEND
20 #define PANGO_ENABLE_BACKEND
21 #endif
23 #ifndef PANGO_ENABLE_ENGINE
24 #define PANGO_ENABLE_ENGINE
25 #endif
28 #include <signal.h>
29 #include <errno.h>
31 #include <libnr/n-art-bpath.h>
32 #include <libnr/nr-matrix-ops.h>
33 #include <libnr/nr-matrix-fns.h>
34 #include <libnr/nr-matrix-translate-ops.h>
35 #include <libnr/nr-scale-matrix-ops.h>
37 #include "libnr/nr-matrix-rotate-ops.h"
38 #include "libnr/nr-matrix-translate-ops.h"
39 #include "libnr/nr-rotate-fns.h"
40 #include "libnr/nr-scale-ops.h"
41 #include "libnr/nr-scale-translate-ops.h"
42 #include "libnr/nr-translate-matrix-ops.h"
43 #include "libnr/nr-translate-scale-ops.h"
44 #include "libnr/nr-convert2geom.h"
45 #include <2geom/transforms.h>
46 #include <2geom/pathvector.h>
48 #include <glib/gmem.h>
50 #include <glibmm/i18n.h>
51 #include "display/nr-arena.h"
52 #include "display/nr-arena-item.h"
53 #include "display/nr-arena-group.h"
54 #include "display/curve.h"
55 #include "display/canvas-bpath.h"
56 #include "sp-item.h"
57 #include "sp-item-group.h"
58 #include "style.h"
59 #include "marker.h"
60 #include "sp-linear-gradient.h"
61 #include "sp-radial-gradient.h"
62 #include "sp-root.h"
63 #include "sp-shape.h"
64 #include "sp-use.h"
65 #include "sp-text.h"
66 #include "sp-flowtext.h"
67 #include "sp-image.h"
68 #include "sp-symbol.h"
69 #include "sp-pattern.h"
70 #include "sp-mask.h"
71 #include "sp-clippath.h"
73 #include <unit-constants.h>
74 #include "helper/png-write.h"
75 #include "helper/pixbuf-ops.h"
77 #include "cairo-renderer.h"
78 #include "cairo-render-context.h"
79 #include "extension/system.h"
81 #include "io/sys.h"
83 #include <cairo.h>
85 // include support for only the compiled-in surface types
86 #ifdef CAIRO_HAS_PDF_SURFACE
87 #include <cairo-pdf.h>
88 #endif
89 #ifdef CAIRO_HAS_PS_SURFACE
90 #include <cairo-ps.h>
91 #endif
93 //#define TRACE(_args) g_printf _args
94 #define TRACE(_args)
96 // FIXME: expose these from sp-clippath/mask.cpp
97 struct SPClipPathView {
98 SPClipPathView *next;
99 unsigned int key;
100 NRArenaItem *arenaitem;
101 NRRect bbox;
102 };
104 struct SPMaskView {
105 SPMaskView *next;
106 unsigned int key;
107 NRArenaItem *arenaitem;
108 NRRect bbox;
109 };
111 namespace Inkscape {
112 namespace Extension {
113 namespace Internal {
115 CairoRenderer::CairoRenderer(void)
116 {}
118 CairoRenderer::~CairoRenderer(void)
119 {
120 /* restore default signal handling for SIGPIPE */
121 #if !defined(_WIN32) && !defined(__WIN32__)
122 (void) signal(SIGPIPE, SIG_DFL);
123 #endif
125 return;
126 }
128 CairoRenderContext*
129 CairoRenderer::createContext(void)
130 {
131 CairoRenderContext *new_context = new CairoRenderContext(this);
132 g_assert( new_context != NULL );
134 new_context->_state_stack = NULL;
135 new_context->_state = NULL;
137 // create initial render state
138 CairoRenderState *state = new_context->_createState();
139 state->transform.set_identity();
140 new_context->_state_stack = g_slist_prepend(new_context->_state_stack, state);
141 new_context->_state = state;
143 return new_context;
144 }
146 void
147 CairoRenderer::destroyContext(CairoRenderContext *ctx)
148 {
149 delete ctx;
150 }
152 /*
154 Here comes the rendering part which could be put into the 'render' methods of SPItems'
156 */
158 /* The below functions are copy&pasted plus slightly modified from *_invoke_print functions. */
159 static void sp_item_invoke_render(SPItem *item, CairoRenderContext *ctx);
160 static void sp_group_render(SPItem *item, CairoRenderContext *ctx);
161 static void sp_use_render(SPItem *item, CairoRenderContext *ctx);
162 static void sp_shape_render(SPItem *item, CairoRenderContext *ctx);
163 static void sp_text_render(SPItem *item, CairoRenderContext *ctx);
164 static void sp_flowtext_render(SPItem *item, CairoRenderContext *ctx);
165 static void sp_image_render(SPItem *item, CairoRenderContext *ctx);
166 static void sp_symbol_render(SPItem *item, CairoRenderContext *ctx);
167 static void sp_asbitmap_render(SPItem *item, CairoRenderContext *ctx);
169 /* TODO FIXME: this does not render painting-marker-01-f.svg of SVG1.1 Test suite correctly. (orientation of one of the markers middle left ) */
170 static void sp_shape_render (SPItem *item, CairoRenderContext *ctx)
171 {
172 NRRect pbox;
174 SPShape *shape = SP_SHAPE(item);
176 if (!shape->curve) return;
178 /* fixme: Think (Lauris) */
179 sp_item_invoke_bbox(item, &pbox, NR::identity(), TRUE);
181 SPStyle* style = SP_OBJECT_STYLE (item);
182 CairoRenderer *renderer = ctx->getRenderer();
184 Geom::PathVector const & pathv = shape->curve->get_pathvector();
186 ctx->renderPathVector(pathv, style, &pbox);
188 /* TODO: make code prettier: lots of variables can be taken out of the loop! */
189 for(Geom::PathVector::const_iterator path_it = pathv.begin(); path_it != pathv.end(); ++path_it) {
190 if ( shape->marker[SP_MARKER_LOC_START] ) {
191 SPMarker* marker = SP_MARKER (shape->marker[SP_MARKER_LOC_START]);
192 SPItem* marker_item = sp_item_first_item_child (SP_OBJECT (shape->marker[SP_MARKER_LOC_START]));
194 NR::Matrix tr(from_2geom(sp_shape_marker_get_transform_at_start(path_it->front())));
196 if (marker->markerUnits == SP_MARKER_UNITS_STROKEWIDTH) {
197 tr = NR::scale(style->stroke_width.computed) * tr;
198 }
200 tr = marker_item->transform * marker->c2p * tr;
202 NR::Matrix old_tr = marker_item->transform;
203 marker_item->transform = tr;
204 renderer->renderItem (ctx, marker_item);
205 marker_item->transform = old_tr;
206 }
208 if ( shape->marker[SP_MARKER_LOC_MID] ) {
209 Geom::Path::const_iterator curve_it1 = path_it->begin(); // incoming curve
210 Geom::Path::const_iterator curve_it2 = ++(path_it->begin()); // outgoing curve
211 while (curve_it2 != path_it->end_default())
212 {
213 /* Put marker between curve_it1 and curve_it2.
214 * Loop to end_default (so including closing segment), because when a path is closed,
215 * there should be a midpoint marker between last segment and closing straight line segment */
217 SPMarker* marker = SP_MARKER (shape->marker[SP_MARKER_LOC_MID]);
218 SPItem* marker_item = sp_item_first_item_child (SP_OBJECT (shape->marker[SP_MARKER_LOC_MID]));
220 NR::Matrix tr(from_2geom(sp_shape_marker_get_transform(*curve_it1, *curve_it2)));
222 if (marker->markerUnits == SP_MARKER_UNITS_STROKEWIDTH) {
223 tr = NR::scale(style->stroke_width.computed) * tr;
224 }
226 tr = marker_item->transform * marker->c2p * tr;
228 NR::Matrix old_tr = marker_item->transform;
229 marker_item->transform = tr;
230 renderer->renderItem (ctx, marker_item);
231 marker_item->transform = old_tr;
233 ++curve_it1;
234 ++curve_it2;
235 }
236 }
238 if ( shape->marker[SP_MARKER_LOC_END] ) {
239 SPMarker* marker = SP_MARKER (shape->marker[SP_MARKER_LOC_END]);
240 SPItem* marker_item = sp_item_first_item_child (SP_OBJECT (shape->marker[SP_MARKER_LOC_END]));
242 NR::Matrix tr(from_2geom(sp_shape_marker_get_transform_at_end(path_it->back_default())));
244 if (marker->markerUnits == SP_MARKER_UNITS_STROKEWIDTH) {
245 tr = NR::scale(style->stroke_width.computed) * tr;
246 }
248 tr = marker_item->transform * marker->c2p * tr;
250 NR::Matrix old_tr = marker_item->transform;
251 marker_item->transform = tr;
252 renderer->renderItem (ctx, marker_item);
253 marker_item->transform = old_tr;
254 }
255 }
256 }
258 static void sp_group_render(SPItem *item, CairoRenderContext *ctx)
259 {
260 SPGroup *group = SP_GROUP(item);
261 CairoRenderer *renderer = ctx->getRenderer();
262 TRACE(("group op: %f\n", SP_SCALE24_TO_FLOAT(SP_OBJECT_STYLE(item)->opacity.value)));
264 GSList *l = g_slist_reverse(group->childList(false));
265 while (l) {
266 SPObject *o = SP_OBJECT (l->data);
267 if (SP_IS_ITEM(o)) {
268 renderer->renderItem (ctx, SP_ITEM (o));
269 }
270 l = g_slist_remove (l, o);
271 }
272 }
274 static void sp_use_render(SPItem *item, CairoRenderContext *ctx)
275 {
276 bool translated = false;
277 SPUse *use = SP_USE(item);
278 CairoRenderer *renderer = ctx->getRenderer();
280 if ((use->x._set && use->x.computed != 0) || (use->y._set && use->y.computed != 0)) {
281 NR::Matrix tp(NR::translate(use->x.computed, use->y.computed));
282 ctx->pushState();
283 ctx->transform(&tp);
284 translated = true;
285 }
287 if (use->child && SP_IS_ITEM(use->child)) {
288 renderer->renderItem(ctx, SP_ITEM(use->child));
289 }
291 if (translated) {
292 ctx->popState();
293 }
294 }
296 static void sp_text_render(SPItem *item, CairoRenderContext *ctx)
297 {
298 SPText *group = SP_TEXT (item);
299 group->layout.showGlyphs(ctx);
300 }
302 static void sp_flowtext_render(SPItem *item, CairoRenderContext *ctx)
303 {
304 SPFlowtext *group = SP_FLOWTEXT(item);
305 group->layout.showGlyphs(ctx);
306 }
308 static void sp_image_render(SPItem *item, CairoRenderContext *ctx)
309 {
310 SPImage *image;
311 guchar *px;
312 int w, h, rs;
314 image = SP_IMAGE (item);
316 if (!image->pixbuf) return;
317 if ((image->width.computed <= 0.0) || (image->height.computed <= 0.0)) return;
319 px = gdk_pixbuf_get_pixels (image->pixbuf);
320 w = gdk_pixbuf_get_width (image->pixbuf);
321 h = gdk_pixbuf_get_height (image->pixbuf);
322 rs = gdk_pixbuf_get_rowstride (image->pixbuf);
324 double x = image->x.computed;
325 double y = image->y.computed;
326 double width = image->width.computed;
327 double height = image->height.computed;
329 if (image->aspect_align != SP_ASPECT_NONE) {
330 calculatePreserveAspectRatio (image->aspect_align, image->aspect_clip, (double)w, (double)h,
331 &x, &y, &width, &height);
332 }
334 if (image->aspect_clip == SP_ASPECT_SLICE && !ctx->getCurrentState()->has_overflow) {
335 ctx->addClippingRect(image->x.computed, image->y.computed, image->width.computed, image->height.computed);
336 }
338 NR::translate tp(x, y);
339 NR::scale s(width / (double)w, height / (double)h);
340 NR::Matrix t(s * tp);
342 ctx->renderImage (px, w, h, rs, &t, SP_OBJECT_STYLE (item));
343 }
345 static void sp_symbol_render(SPItem *item, CairoRenderContext *ctx)
346 {
347 SPSymbol *symbol = SP_SYMBOL(item);
348 if (!SP_OBJECT_IS_CLONED (symbol))
349 return;
351 /* Cloned <symbol> is actually renderable */
352 ctx->pushState();
353 ctx->transform(&symbol->c2p);
355 // apply viewbox if set
356 if (0 /*symbol->viewBox_set*/) {
357 NR::Matrix vb2user;
358 double x, y, width, height;
359 double view_width, view_height;
360 x = 0.0;
361 y = 0.0;
362 width = 1.0;
363 height = 1.0;
365 view_width = symbol->viewBox.x1 - symbol->viewBox.x0;
366 view_height = symbol->viewBox.y1 - symbol->viewBox.y0;
368 calculatePreserveAspectRatio(symbol->aspect_align, symbol->aspect_clip, view_width, view_height,
369 &x, &y,&width, &height);
371 // [itemTransform *] translate(x, y) * scale(w/vw, h/vh) * translate(-vx, -vy);
372 vb2user.set_identity();
373 vb2user[0] = width / view_width;
374 vb2user[3] = height / view_height;
375 vb2user[4] = x - symbol->viewBox.x0 * vb2user[0];
376 vb2user[5] = y - symbol->viewBox.y0 * vb2user[3];
378 ctx->transform(&vb2user);
379 }
381 sp_group_render(item, ctx);
382 ctx->popState();
383 }
385 static void sp_root_render(SPItem *item, CairoRenderContext *ctx)
386 {
387 SPRoot *root = SP_ROOT(item);
388 CairoRenderer *renderer = ctx->getRenderer();
390 if (!ctx->getCurrentState()->has_overflow && SP_OBJECT(item)->parent)
391 ctx->addClippingRect(root->x.computed, root->y.computed, root->width.computed, root->height.computed);
393 ctx->pushState();
394 renderer->setStateForItem(ctx, item);
395 ctx->transform(&root->c2p);
396 sp_group_render(item, ctx);
397 ctx->popState();
398 }
400 /**
401 this function convert the item to a raster image and include the raster into the cairo renderer
402 */
403 static void sp_asbitmap_render(SPItem *item, CairoRenderContext *ctx)
404 {
405 g_warning("render as bitmap");
407 //the code now was copied from sp_selection_create_bitmap_copy
409 SPDocument *document = SP_OBJECT(item)->document;
410 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(document);
412 // Get the bounding box of the selection
413 //NR::Maybe<NR::Rect> _bbox = item->getBounds(from_2geom(sp_item_i2d_affine(item)));
414 // NRRect bbox = item->getBounds(from_2geom(sp_item_i2d_affine(item)));
415 NRRect bbox(item->getBounds(from_2geom(sp_item_i2d_affine(item))));
418 // List of the items to show; all others will be hidden
419 GSList *items = NULL; //g_slist_copy ((GSList *) selection->itemList());
420 items = g_slist_append(items, item);
422 // Remember parent and z-order of the topmost one
423 gint pos = SP_OBJECT_REPR(g_slist_last(items)->data)->position();
424 SPObject *parent_object = SP_OBJECT_PARENT(g_slist_last(items)->data);
425 Inkscape::XML::Node *parent = SP_OBJECT_REPR(parent_object);
427 // Calculate resolution
428 double res;
429 /** @TODO reimplement the resolution stuff
430 */
431 res = ctx->getBitmapResolution();
432 if(res == 0) {
433 res = PX_PER_IN;
434 }
437 // The width and height of the bitmap in pixels
438 unsigned width = (unsigned) floor ((bbox.x1 - bbox.x0) * res / PX_PER_IN);
439 unsigned height =(unsigned) floor ((bbox.y1 - bbox.y0) * res / PX_PER_IN);
441 // Find out if we have to run a filter
442 gchar const *run = NULL;
443 gchar const *filter = NULL;
444 /** @TODO reimplement the filter stuff
445 //gchar const *filter = prefs_get_string_attribute ("options.createbitmap", "filter");
446 if (filter) {
447 // filter command is given;
448 // see if we have a parameter to pass to it
449 gchar const *param1 = prefs_get_string_attribute ("options.createbitmap", "filter_param1");
450 if (param1) {
451 if (param1[strlen(param1) - 1] == '%') {
452 // if the param string ends with %, interpret it as a percentage of the image's max dimension
453 gchar p1[256];
454 g_ascii_dtostr (p1, 256, ceil (g_ascii_strtod (param1, NULL) * MAX(width, height) / 100));
455 // the first param is always the image filename, the second is param1
456 run = g_strdup_printf ("%s \"%s\" %s", filter, filepath, p1);
457 } else {
458 // otherwise pass the param1 unchanged
459 run = g_strdup_printf ("%s \"%s\" %s", filter, filepath, param1);
460 }
461 } else {
462 // run without extra parameter
463 run = g_strdup_printf ("%s \"%s\"", filter, filepath);
464 }
465 }
466 */
467 // Calculate the matrix that will be applied to the image so that it exactly overlaps the source objects
468 NR::Matrix eek = from_2geom(sp_item_i2d_affine (SP_ITEM(parent_object)));
469 NR::Matrix t;
471 double shift_x = bbox.x0;
472 double shift_y = bbox.y1;
473 if (res == PX_PER_IN) { // for default 90 dpi, snap it to pixel grid
474 shift_x = round (shift_x);
475 shift_y = -round (-shift_y); // this gets correct rounding despite coordinate inversion, remove the negations when the inversion is gone
476 }
477 t = (NR::Matrix)(NR::scale(1, -1) * (NR::Matrix)(NR::translate (shift_x, shift_y)* eek.inverse()));
479 //t = t * ((NR::Matrix)ctx->getCurrentState()->transform).inverse();
481 // Do the export
482 GdkPixbuf *pb = sp_generate_internal_bitmap(document, NULL,
483 bbox.x0, bbox.y0, bbox.x1, bbox.y1, width, height, res, res, (guint32) 0xffffff00, items );
485 // Run filter, if any
486 /*
487 if (run) {
488 g_print ("Running external filter: %s\n", run);
489 system (run);
490 }
491 */
492 if (pb) {
493 unsigned char *px = gdk_pixbuf_get_pixels (pb);
494 unsigned int w = gdk_pixbuf_get_width(pb);
495 unsigned int h = gdk_pixbuf_get_height(pb);
496 unsigned int rs = gdk_pixbuf_get_rowstride(pb);
497 NR::Matrix matrix;
498 matrix = t;
499 //matrix = ((NR::Matrix)ctx->getCurrentState()->transform).inverse();
500 //matrix.set_identity();
502 ctx->renderImage (px, w, h, rs, &matrix, SP_OBJECT_STYLE (item));
503 /*
504 // Create the repr for the image
505 Inkscape::XML::Node * repr = xml_doc->createElement("svg:image");
506 repr->setAttribute("xlink:href", filename);
507 repr->setAttribute("sodipodi:absref", filepath);
508 if (res == PX_PER_IN) { // for default 90 dpi, snap it to pixel grid
509 sp_repr_set_svg_double(repr, "width", width);
510 sp_repr_set_svg_double(repr, "height", height);
511 } else {
512 sp_repr_set_svg_double(repr, "width", (bbox.x1 - bbox.x0));
513 sp_repr_set_svg_double(repr, "height", (bbox.y1 - bbox.y0));
514 }
516 // Write transform
517 gchar *c=sp_svg_transform_write(t);
518 repr->setAttribute("transform", c);
519 g_free(c);
521 // add the new repr to the parent
522 parent->appendChild(repr);
524 // move to the saved position
525 repr->setPosition(pos > 0 ? pos + 1 : 1);
526 */
527 gdk_pixbuf_unref (pb);
528 }
529 g_slist_free (items);
530 }
532 static void sp_item_invoke_render(SPItem *item, CairoRenderContext *ctx)
533 {
534 // Check item's visibility
535 if (item->isHidden()) {
536 return;
537 }
539 SPStyle* style = SP_OBJECT_STYLE (item);
540 if((ctx->getFilterToBitmap() == TRUE) && (style->filter.set != 0)) {
541 return sp_asbitmap_render(item, ctx);
542 }
544 if (SP_IS_ROOT(item)) {
545 TRACE(("root\n"));
546 return sp_root_render(item, ctx);
547 } else if (SP_IS_GROUP(item)) {
548 TRACE(("group\n"));
549 return sp_group_render(item, ctx);
550 } else if (SP_IS_SHAPE(item)) {
551 TRACE(("shape\n"));
552 return sp_shape_render(item, ctx);
553 } else if (SP_IS_USE(item)) {
554 TRACE(("use begin---\n"));
555 sp_use_render(item, ctx);
556 TRACE(("---use end\n"));
557 } else if (SP_IS_SYMBOL(item)) {
558 TRACE(("symbol\n"));
559 return sp_symbol_render(item, ctx);
560 } else if (SP_IS_TEXT(item)) {
561 TRACE(("text\n"));
562 return sp_text_render(item, ctx);
563 } else if (SP_IS_FLOWTEXT(item)) {
564 TRACE(("flowtext\n"));
565 return sp_flowtext_render(item, ctx);
566 } else if (SP_IS_IMAGE(item)) {
567 TRACE(("image\n"));
568 return sp_image_render(item, ctx);
569 }
570 }
572 void
573 CairoRenderer::setStateForItem(CairoRenderContext *ctx, SPItem const *item)
574 {
575 SPStyle const *style = SP_OBJECT_STYLE(item);
576 ctx->setStateForStyle(style);
578 CairoRenderState *state = ctx->getCurrentState();
579 state->clip_path = item->clip_ref->getObject();
580 state->mask = item->mask_ref->getObject();
582 // If parent_has_userspace is true the parent state's transform
583 // has to be used for the mask's/clippath's context.
584 // This is so because we use the image's/(flow)text's transform for positioning
585 // instead of explicitly specifying it and letting the renderer do the
586 // transformation before rendering the item.
587 if (SP_IS_TEXT(item) || SP_IS_FLOWTEXT(item) || SP_IS_IMAGE(item))
588 state->parent_has_userspace = TRUE;
589 TRACE(("set op: %f\n", state->opacity));
590 }
592 void
593 CairoRenderer::renderItem(CairoRenderContext *ctx, SPItem *item)
594 {
595 ctx->pushState();
596 setStateForItem(ctx, item);
598 CairoRenderState *state = ctx->getCurrentState();
599 state->need_layer = ( state->mask || state->clip_path || state->opacity != 1.0 );
601 if (state->need_layer) {
602 state->merge_opacity = FALSE;
603 ctx->pushLayer();
604 }
605 ctx->transform(&item->transform);
606 sp_item_invoke_render(item, ctx);
608 if (state->need_layer)
609 ctx->popLayer();
611 ctx->popState();
612 }
614 bool
615 CairoRenderer::setupDocument(CairoRenderContext *ctx, SPDocument *doc)
616 {
617 g_assert( ctx != NULL );
619 if (ctx->_vector_based_target) {
620 // width and height in pt
621 ctx->_width = sp_document_width(doc) * PT_PER_PX;
622 ctx->_height = sp_document_height(doc) * PT_PER_PX;
623 } else {
624 ctx->_width = sp_document_width(doc);
625 ctx->_height = sp_document_height(doc);
626 }
628 NRRect d;
629 bool pageBoundingBox = true;
630 if (pageBoundingBox) {
631 d.x0 = d.y0 = 0;
632 d.x1 = ceil(ctx->_width);
633 d.y1 = ceil(ctx->_height);
634 } else {
635 SPItem* doc_item = SP_ITEM(sp_document_root(doc));
636 sp_item_invoke_bbox(doc_item, &d, from_2geom(sp_item_i2r_affine(doc_item)), TRUE);
637 if (ctx->_vector_based_target) {
638 // convert from px to pt
639 d.x0 *= PT_PER_PX;
640 d.x1 *= PT_PER_PX;
641 d.y0 *= PT_PER_PX;
642 d.y1 *= PT_PER_PX;
643 }
644 }
645 TRACE(("%f x %f\n", ctx->_width, ctx->_height));
647 return ctx->setupSurface(d.x1-d.x0, d.y1-d.y0);
648 }
650 #include "macros.h" // SP_PRINT_*
652 void
653 CairoRenderer::applyClipPath(CairoRenderContext *ctx, SPClipPath const *cp)
654 {
655 g_assert( ctx != NULL && ctx->_is_valid );
657 if (cp == NULL)
658 return;
660 CairoRenderContext::CairoRenderMode saved_mode = ctx->getRenderMode();
661 ctx->setRenderMode(CairoRenderContext::RENDER_MODE_CLIP);
663 NR::Matrix saved_ctm;
664 if (cp->clipPathUnits == SP_CONTENT_UNITS_OBJECTBOUNDINGBOX) {
665 //SP_PRINT_DRECT("clipd", cp->display->bbox);
666 NRRect clip_bbox(cp->display->bbox);
667 NR::Matrix t(NR::scale(clip_bbox.x1 - clip_bbox.x0, clip_bbox.y1 - clip_bbox.y0));
668 t[4] = clip_bbox.x0;
669 t[5] = clip_bbox.y0;
670 t *= ctx->getCurrentState()->transform;
671 ctx->getTransform(&saved_ctm);
672 ctx->setTransform(&t);
673 }
675 TRACE(("BEGIN clip\n"));
676 SPObject *co = SP_OBJECT(cp);
677 for (SPObject *child = sp_object_first_child(co) ; child != NULL; child = SP_OBJECT_NEXT(child) ) {
678 if (SP_IS_ITEM(child)) {
679 SPItem *item = SP_ITEM(child);
680 renderItem(ctx, item);
681 }
682 }
683 TRACE(("END clip\n"));
685 // do clipping only if this was the first call to applyClipPath
686 if (ctx->getClipMode() == CairoRenderContext::CLIP_MODE_PATH
687 && saved_mode == CairoRenderContext::RENDER_MODE_NORMAL)
688 cairo_clip(ctx->_cr);
690 if (cp->clipPathUnits == SP_CONTENT_UNITS_OBJECTBOUNDINGBOX)
691 ctx->setTransform(&saved_ctm);
693 ctx->setRenderMode(saved_mode);
694 }
696 void
697 CairoRenderer::applyMask(CairoRenderContext *ctx, SPMask const *mask)
698 {
699 g_assert( ctx != NULL && ctx->_is_valid );
701 if (mask == NULL)
702 return;
704 //SP_PRINT_DRECT("maskd", &mask->display->bbox);
705 NRRect mask_bbox(mask->display->bbox);
706 // TODO: should the bbox be transformed if maskUnits != userSpaceOnUse ?
707 if (mask->maskContentUnits == SP_CONTENT_UNITS_OBJECTBOUNDINGBOX) {
708 NR::Matrix t(NR::scale(mask_bbox.x1 - mask_bbox.x0, mask_bbox.y1 - mask_bbox.y0));
709 t[4] = mask_bbox.x0;
710 t[5] = mask_bbox.y0;
711 t *= ctx->getCurrentState()->transform;
712 ctx->setTransform(&t);
713 }
715 // clip mask contents
716 ctx->addClippingRect(mask_bbox.x0, mask_bbox.y0, mask_bbox.x1 - mask_bbox.x0, mask_bbox.y1 - mask_bbox.y0);
718 ctx->pushState();
720 TRACE(("BEGIN mask\n"));
721 SPObject *co = SP_OBJECT(mask);
722 for (SPObject *child = sp_object_first_child(co) ; child != NULL; child = SP_OBJECT_NEXT(child) ) {
723 if (SP_IS_ITEM(child)) {
724 SPItem *item = SP_ITEM(child);
725 renderItem(ctx, item);
726 }
727 }
728 TRACE(("END mask\n"));
730 ctx->popState();
731 }
733 void
734 calculatePreserveAspectRatio(unsigned int aspect_align, unsigned int aspect_clip, double vp_width, double vp_height,
735 double *x, double *y, double *width, double *height)
736 {
737 if (aspect_align == SP_ASPECT_NONE)
738 return;
740 double scalex, scaley, scale;
741 double new_width, new_height;
742 scalex = *width / vp_width;
743 scaley = *height / vp_height;
744 scale = (aspect_clip == SP_ASPECT_MEET) ? MIN(scalex, scaley) : MAX(scalex, scaley);
745 new_width = vp_width * scale;
746 new_height = vp_height * scale;
747 /* Now place viewbox to requested position */
748 switch (aspect_align) {
749 case SP_ASPECT_XMIN_YMIN:
750 break;
751 case SP_ASPECT_XMID_YMIN:
752 *x -= 0.5 * (new_width - *width);
753 break;
754 case SP_ASPECT_XMAX_YMIN:
755 *x -= 1.0 * (new_width - *width);
756 break;
757 case SP_ASPECT_XMIN_YMID:
758 *y -= 0.5 * (new_height - *height);
759 break;
760 case SP_ASPECT_XMID_YMID:
761 *x -= 0.5 * (new_width - *width);
762 *y -= 0.5 * (new_height - *height);
763 break;
764 case SP_ASPECT_XMAX_YMID:
765 *x -= 1.0 * (new_width - *width);
766 *y -= 0.5 * (new_height - *height);
767 break;
768 case SP_ASPECT_XMIN_YMAX:
769 *y -= 1.0 * (new_height - *height);
770 break;
771 case SP_ASPECT_XMID_YMAX:
772 *x -= 0.5 * (new_width - *width);
773 *y -= 1.0 * (new_height - *height);
774 break;
775 case SP_ASPECT_XMAX_YMAX:
776 *x -= 1.0 * (new_width - *width);
777 *y -= 1.0 * (new_height - *height);
778 break;
779 default:
780 break;
781 }
782 *width = new_width;
783 *height = new_height;
784 }
786 #include "clear-n_.h"
788 } /* namespace Internal */
789 } /* namespace Extension */
790 } /* namespace Inkscape */
792 #undef TRACE
794 /* End of GNU GPL code */
796 /*
797 Local Variables:
798 mode:c++
799 c-file-style:"stroustrup"
800 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
801 indent-tabs-mode:nil
802 fill-column:99
803 End:
804 */
805 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :