86e04fb548e2904feb7676102bde39f7427b208f
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/nr-rect.h"
32 #include <2geom/transforms.h>
33 #include <2geom/pathvector.h>
35 #include <glib/gmem.h>
37 #include <glibmm/i18n.h>
38 #include "display/nr-arena.h"
39 #include "display/nr-arena-item.h"
40 #include "display/nr-arena-group.h"
41 #include "display/curve.h"
42 #include "display/canvas-bpath.h"
43 #include "sp-item.h"
44 #include "sp-item-group.h"
45 #include "style.h"
46 #include "marker.h"
47 #include "sp-linear-gradient.h"
48 #include "sp-radial-gradient.h"
49 #include "sp-root.h"
50 #include "sp-shape.h"
51 #include "sp-use.h"
52 #include "sp-text.h"
53 #include "sp-flowtext.h"
54 #include "sp-image.h"
55 #include "sp-symbol.h"
56 #include "sp-pattern.h"
57 #include "sp-mask.h"
58 #include "sp-clippath.h"
60 #include <unit-constants.h>
61 #include "helper/png-write.h"
62 #include "helper/pixbuf-ops.h"
64 #include "cairo-renderer.h"
65 #include "cairo-render-context.h"
66 #include "extension/system.h"
68 #include "io/sys.h"
70 #include <cairo.h>
72 // include support for only the compiled-in surface types
73 #ifdef CAIRO_HAS_PDF_SURFACE
74 #include <cairo-pdf.h>
75 #endif
76 #ifdef CAIRO_HAS_PS_SURFACE
77 #include <cairo-ps.h>
78 #endif
80 //#define TRACE(_args) g_printf _args
81 #define TRACE(_args)
82 //#define TEST(_args) _args
83 #define TEST(_args)
85 // FIXME: expose these from sp-clippath/mask.cpp
86 struct SPClipPathView {
87 SPClipPathView *next;
88 unsigned int key;
89 NRArenaItem *arenaitem;
90 NRRect bbox;
91 };
93 struct SPMaskView {
94 SPMaskView *next;
95 unsigned int key;
96 NRArenaItem *arenaitem;
97 NRRect bbox;
98 };
100 namespace Inkscape {
101 namespace Extension {
102 namespace Internal {
104 CairoRenderer::CairoRenderer(void)
105 {}
107 CairoRenderer::~CairoRenderer(void)
108 {
109 /* restore default signal handling for SIGPIPE */
110 #if !defined(_WIN32) && !defined(__WIN32__)
111 (void) signal(SIGPIPE, SIG_DFL);
112 #endif
114 return;
115 }
117 CairoRenderContext*
118 CairoRenderer::createContext(void)
119 {
120 CairoRenderContext *new_context = new CairoRenderContext(this);
121 g_assert( new_context != NULL );
123 new_context->_state_stack = NULL;
124 new_context->_state = NULL;
126 // create initial render state
127 CairoRenderState *state = new_context->_createState();
128 state->transform = Geom::identity();
129 new_context->_state_stack = g_slist_prepend(new_context->_state_stack, state);
130 new_context->_state = state;
132 return new_context;
133 }
135 void
136 CairoRenderer::destroyContext(CairoRenderContext *ctx)
137 {
138 delete ctx;
139 }
141 /*
143 Here comes the rendering part which could be put into the 'render' methods of SPItems'
145 */
147 /* The below functions are copy&pasted plus slightly modified from *_invoke_print functions. */
148 static void sp_item_invoke_render(SPItem *item, CairoRenderContext *ctx);
149 static void sp_group_render(SPItem *item, CairoRenderContext *ctx);
150 static void sp_use_render(SPItem *item, CairoRenderContext *ctx);
151 static void sp_shape_render(SPItem *item, CairoRenderContext *ctx);
152 static void sp_text_render(SPItem *item, CairoRenderContext *ctx);
153 static void sp_flowtext_render(SPItem *item, CairoRenderContext *ctx);
154 static void sp_image_render(SPItem *item, CairoRenderContext *ctx);
155 static void sp_symbol_render(SPItem *item, CairoRenderContext *ctx);
156 static void sp_asbitmap_render(SPItem *item, CairoRenderContext *ctx);
158 /* 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 ) */
159 static void sp_shape_render (SPItem *item, CairoRenderContext *ctx)
160 {
161 NRRect pbox;
163 SPShape *shape = SP_SHAPE(item);
165 if (!shape->curve) return;
167 /* fixme: Think (Lauris) */
168 sp_item_invoke_bbox(item, &pbox, Geom::identity(), TRUE);
170 SPStyle* style = SP_OBJECT_STYLE (item);
171 CairoRenderer *renderer = ctx->getRenderer();
173 Geom::PathVector const & pathv = shape->curve->get_pathvector();
175 ctx->renderPathVector(pathv, style, &pbox);
177 /* TODO: make code prettier: lots of variables can be taken out of the loop! */
178 for(Geom::PathVector::const_iterator path_it = pathv.begin(); path_it != pathv.end(); ++path_it) {
179 if ( shape->marker[SP_MARKER_LOC_START] ) {
180 SPMarker* marker = SP_MARKER (shape->marker[SP_MARKER_LOC_START]);
181 SPItem* marker_item = sp_item_first_item_child (SP_OBJECT (shape->marker[SP_MARKER_LOC_START]));
183 Geom::Matrix tr;
184 if (marker->orient_auto) {
185 tr = sp_shape_marker_get_transform_at_start(path_it->front());
186 } else {
187 tr = Geom::Rotate::from_degrees(marker->orient) * Geom::Translate(path_it->front().pointAt(0));
188 }
190 if (marker->markerUnits == SP_MARKER_UNITS_STROKEWIDTH) {
191 tr = Geom::Scale(style->stroke_width.computed) * tr;
192 }
194 tr = (Geom::Matrix)marker_item->transform * (Geom::Matrix)marker->c2p * tr;
196 Geom::Matrix old_tr = marker_item->transform;
197 marker_item->transform = tr;
198 renderer->renderItem (ctx, marker_item);
199 marker_item->transform = old_tr;
200 }
202 if ( shape->marker[SP_MARKER_LOC_MID] && (path_it->size_default() > 1) ) {
203 Geom::Path::const_iterator curve_it1 = path_it->begin(); // incoming curve
204 Geom::Path::const_iterator curve_it2 = ++(path_it->begin()); // outgoing curve
205 while (curve_it2 != path_it->end_default())
206 {
207 /* Put marker between curve_it1 and curve_it2.
208 * Loop to end_default (so including closing segment), because when a path is closed,
209 * there should be a midpoint marker between last segment and closing straight line segment */
211 SPMarker* marker = SP_MARKER (shape->marker[SP_MARKER_LOC_MID]);
212 SPItem* marker_item = sp_item_first_item_child (SP_OBJECT (shape->marker[SP_MARKER_LOC_MID]));
214 Geom::Matrix tr;
215 if (marker->orient_auto) {
216 tr = sp_shape_marker_get_transform(*curve_it1, *curve_it2);
217 } else {
218 tr = Geom::Rotate::from_degrees(marker->orient) * Geom::Translate(curve_it1->pointAt(1));
219 }
221 if (marker->markerUnits == SP_MARKER_UNITS_STROKEWIDTH) {
222 tr = Geom::Scale(style->stroke_width.computed) * tr;
223 }
225 tr = (Geom::Matrix)marker_item->transform * (Geom::Matrix)marker->c2p * tr;
227 Geom::Matrix old_tr = marker_item->transform;
228 marker_item->transform = tr;
229 renderer->renderItem (ctx, marker_item);
230 marker_item->transform = old_tr;
232 ++curve_it1;
233 ++curve_it2;
234 }
235 }
237 if ( shape->marker[SP_MARKER_LOC_END] ) {
238 SPMarker* marker = SP_MARKER (shape->marker[SP_MARKER_LOC_END]);
239 SPItem* marker_item = sp_item_first_item_child (SP_OBJECT (shape->marker[SP_MARKER_LOC_END]));
241 /* Get reference to last curve in the path.
242 * For moveto-only path, this returns the "closing line segment". */
243 unsigned int index = path_it->size_default();
244 if (index > 0) {
245 index--;
246 }
247 Geom::Curve const &lastcurve = (*path_it)[index];
249 Geom::Matrix tr;
250 if (marker->orient_auto) {
251 tr = sp_shape_marker_get_transform_at_end(lastcurve);
252 } else {
253 tr = Geom::Rotate::from_degrees(marker->orient) * Geom::Translate(lastcurve.pointAt(1));
254 }
256 if (marker->markerUnits == SP_MARKER_UNITS_STROKEWIDTH) {
257 tr = Geom::Scale(style->stroke_width.computed) * tr;
258 }
260 tr = (Geom::Matrix)marker_item->transform * (Geom::Matrix)marker->c2p * tr;
262 Geom::Matrix old_tr = marker_item->transform;
263 marker_item->transform = tr;
264 renderer->renderItem (ctx, marker_item);
265 marker_item->transform = old_tr;
266 }
267 }
268 }
270 static void sp_group_render(SPItem *item, CairoRenderContext *ctx)
271 {
272 SPGroup *group = SP_GROUP(item);
273 CairoRenderer *renderer = ctx->getRenderer();
274 TRACE(("sp_group_render opacity: %f\n", SP_SCALE24_TO_FLOAT(SP_OBJECT_STYLE(item)->opacity.value)));
276 GSList *l = g_slist_reverse(group->childList(false));
277 while (l) {
278 SPObject *o = SP_OBJECT (l->data);
279 if (SP_IS_ITEM(o)) {
280 renderer->renderItem (ctx, SP_ITEM (o));
281 }
282 l = g_slist_remove (l, o);
283 }
284 }
286 static void sp_use_render(SPItem *item, CairoRenderContext *ctx)
287 {
288 bool translated = false;
289 SPUse *use = SP_USE(item);
290 CairoRenderer *renderer = ctx->getRenderer();
292 if ((use->x._set && use->x.computed != 0) || (use->y._set && use->y.computed != 0)) {
293 Geom::Matrix tp(Geom::Translate(use->x.computed, use->y.computed));
294 ctx->pushState();
295 ctx->transform(&tp);
296 translated = true;
297 }
299 if (use->child && SP_IS_ITEM(use->child)) {
300 renderer->renderItem(ctx, SP_ITEM(use->child));
301 }
303 if (translated) {
304 ctx->popState();
305 }
306 }
308 static void sp_text_render(SPItem *item, CairoRenderContext *ctx)
309 {
310 SPText *group = SP_TEXT (item);
311 group->layout.showGlyphs(ctx);
312 }
314 static void sp_flowtext_render(SPItem *item, CairoRenderContext *ctx)
315 {
316 SPFlowtext *group = SP_FLOWTEXT(item);
317 group->layout.showGlyphs(ctx);
318 }
320 static void sp_image_render(SPItem *item, CairoRenderContext *ctx)
321 {
322 SPImage *image;
323 guchar *px;
324 int w, h, rs;
326 image = SP_IMAGE (item);
328 if (!image->pixbuf) return;
329 if ((image->width.computed <= 0.0) || (image->height.computed <= 0.0)) return;
331 px = gdk_pixbuf_get_pixels (image->pixbuf);
332 w = gdk_pixbuf_get_width (image->pixbuf);
333 h = gdk_pixbuf_get_height (image->pixbuf);
334 rs = gdk_pixbuf_get_rowstride (image->pixbuf);
336 double x = image->x.computed;
337 double y = image->y.computed;
338 double width = image->width.computed;
339 double height = image->height.computed;
341 if (image->aspect_align != SP_ASPECT_NONE) {
342 calculatePreserveAspectRatio (image->aspect_align, image->aspect_clip, (double)w, (double)h,
343 &x, &y, &width, &height);
344 }
346 if (image->aspect_clip == SP_ASPECT_SLICE && !ctx->getCurrentState()->has_overflow) {
347 ctx->addClippingRect(image->x.computed, image->y.computed, image->width.computed, image->height.computed);
348 }
350 Geom::Translate tp(x, y);
351 Geom::Scale s(width / (double)w, height / (double)h);
352 Geom::Matrix t(s * tp);
354 ctx->renderImage (px, w, h, rs, &t, SP_OBJECT_STYLE (item));
355 }
357 static void sp_symbol_render(SPItem *item, CairoRenderContext *ctx)
358 {
359 SPSymbol *symbol = SP_SYMBOL(item);
360 if (!SP_OBJECT_IS_CLONED (symbol))
361 return;
363 /* Cloned <symbol> is actually renderable */
364 ctx->pushState();
365 ctx->transform(&symbol->c2p);
367 // apply viewbox if set
368 if (0 /*symbol->viewBox_set*/) {
369 Geom::Matrix vb2user;
370 double x, y, width, height;
371 double view_width, view_height;
372 x = 0.0;
373 y = 0.0;
374 width = 1.0;
375 height = 1.0;
377 view_width = symbol->viewBox.x1 - symbol->viewBox.x0;
378 view_height = symbol->viewBox.y1 - symbol->viewBox.y0;
380 calculatePreserveAspectRatio(symbol->aspect_align, symbol->aspect_clip, view_width, view_height,
381 &x, &y,&width, &height);
383 // [itemTransform *] translate(x, y) * scale(w/vw, h/vh) * translate(-vx, -vy);
384 vb2user = Geom::identity();
385 vb2user[0] = width / view_width;
386 vb2user[3] = height / view_height;
387 vb2user[4] = x - symbol->viewBox.x0 * vb2user[0];
388 vb2user[5] = y - symbol->viewBox.y0 * vb2user[3];
390 ctx->transform(&vb2user);
391 }
393 sp_group_render(item, ctx);
394 ctx->popState();
395 }
397 static void sp_root_render(SPItem *item, CairoRenderContext *ctx)
398 {
399 SPRoot *root = SP_ROOT(item);
400 CairoRenderer *renderer = ctx->getRenderer();
402 if (!ctx->getCurrentState()->has_overflow && SP_OBJECT(item)->parent)
403 ctx->addClippingRect(root->x.computed, root->y.computed, root->width.computed, root->height.computed);
405 ctx->pushState();
406 renderer->setStateForItem(ctx, item);
407 Geom::Matrix tempmat (root->c2p);
408 ctx->transform(&tempmat);
409 sp_group_render(item, ctx);
410 ctx->popState();
411 }
413 /**
414 This function converts the item to a raster image and includes the image into the cairo renderer.
415 It is only used for filters and then only when rendering filters as bitmaps is requested.
416 */
417 static void sp_asbitmap_render(SPItem *item, CairoRenderContext *ctx)
418 {
420 // The code was adapted from sp_selection_create_bitmap_copy in selection-chemistry.cpp
422 // Calculate resolution
423 double res;
424 /** @TODO reimplement the resolution stuff (WHY?)
425 */
426 res = ctx->getBitmapResolution();
427 if(res == 0) {
428 res = PX_PER_IN;
429 }
430 TRACE(("sp_asbitmap_render: resolution: %f\n", res ));
432 // Get the bounding box of the selection in document coordinates.
433 NRRect bbox(item->getBounds(sp_item_i2d_affine(item), SPItem::RENDERING_BBOX ));
435 // The width and height of the bitmap in pixels
436 unsigned width = (unsigned) floor ((bbox.x1 - bbox.x0) * (res / PX_PER_IN));
437 unsigned height =(unsigned) floor ((bbox.y1 - bbox.y0) * (res / PX_PER_IN));
439 // Scale to exactly fit integer bitmap inside bounding box
440 double scale_x = (bbox.x1 - bbox.x0) / width;
441 double scale_y = (bbox.y1 - bbox.y0) / height;
443 // Location of bounding box in document coordinates.
444 double shift_x = bbox.x0;
445 double shift_y = bbox.y1;
447 // For default 90 dpi, snap bitmap to pixel grid
448 if (res == PX_PER_IN) {
449 shift_x = round (shift_x);
450 shift_y = -round (-shift_y); // Correct rounding despite coordinate inversion.
451 // Remove the negations when the inversion is gone.
452 }
454 // Calculate the matrix that will be applied to the image so that it exactly overlaps the source objects
456 // Matix to put bitmap in correct place on document
457 Geom::Matrix t_on_document = (Geom::Matrix)(Geom::Scale (scale_x, -scale_y)) *
458 (Geom::Matrix)(Geom::Translate (shift_x, shift_y));
460 // ctx matrix already includes item transformation. We must substract.
461 Geom::Matrix t_item = sp_item_i2d_affine (item);
462 Geom::Matrix t = t_on_document * t_item.inverse();
464 // Do the export
465 SPDocument *document = SP_OBJECT(item)->document;
466 GSList *items = NULL;
467 items = g_slist_append(items, item);
469 GdkPixbuf *pb = sp_generate_internal_bitmap(document, NULL,
470 bbox.x0, bbox.y0, bbox.x1, bbox.y1, width, height, res, res, (guint32) 0xffffff00, items );
472 if (pb) {
473 TEST(gdk_pixbuf_save( pb, "bitmap.png", "png", NULL, NULL ));
474 unsigned char *px = gdk_pixbuf_get_pixels (pb);
475 unsigned int w = gdk_pixbuf_get_width(pb);
476 unsigned int h = gdk_pixbuf_get_height(pb);
477 unsigned int rs = gdk_pixbuf_get_rowstride(pb);
478 ctx->renderImage (px, w, h, rs, &t, SP_OBJECT_STYLE (item));
479 gdk_pixbuf_unref (pb);
480 }
481 g_slist_free (items);
482 }
485 static void sp_item_invoke_render(SPItem *item, CairoRenderContext *ctx)
486 {
487 // Check item's visibility
488 if (item->isHidden()) {
489 return;
490 }
492 SPStyle* style = SP_OBJECT_STYLE (item);
493 if((ctx->getFilterToBitmap() == TRUE) && (style->filter.set != 0)) {
494 return sp_asbitmap_render(item, ctx);
495 }
497 if (SP_IS_ROOT(item)) {
498 TRACE(("root\n"));
499 return sp_root_render(item, ctx);
500 } else if (SP_IS_GROUP(item)) {
501 TRACE(("group\n"));
502 return sp_group_render(item, ctx);
503 } else if (SP_IS_SHAPE(item)) {
504 TRACE(("shape\n"));
505 return sp_shape_render(item, ctx);
506 } else if (SP_IS_USE(item)) {
507 TRACE(("use begin---\n"));
508 sp_use_render(item, ctx);
509 TRACE(("---use end\n"));
510 } else if (SP_IS_SYMBOL(item)) {
511 TRACE(("symbol\n"));
512 return sp_symbol_render(item, ctx);
513 } else if (SP_IS_TEXT(item)) {
514 TRACE(("text\n"));
515 return sp_text_render(item, ctx);
516 } else if (SP_IS_FLOWTEXT(item)) {
517 TRACE(("flowtext\n"));
518 return sp_flowtext_render(item, ctx);
519 } else if (SP_IS_IMAGE(item)) {
520 TRACE(("image\n"));
521 return sp_image_render(item, ctx);
522 }
523 }
525 void
526 CairoRenderer::setStateForItem(CairoRenderContext *ctx, SPItem const *item)
527 {
528 SPStyle const *style = SP_OBJECT_STYLE(item);
529 ctx->setStateForStyle(style);
531 CairoRenderState *state = ctx->getCurrentState();
532 state->clip_path = item->clip_ref->getObject();
533 state->mask = item->mask_ref->getObject();
534 state->item_transform = Geom::Matrix (item->transform);
536 // If parent_has_userspace is true the parent state's transform
537 // has to be used for the mask's/clippath's context.
538 // This is so because we use the image's/(flow)text's transform for positioning
539 // instead of explicitly specifying it and letting the renderer do the
540 // transformation before rendering the item.
541 if (SP_IS_TEXT(item) || SP_IS_FLOWTEXT(item) || SP_IS_IMAGE(item))
542 state->parent_has_userspace = TRUE;
543 TRACE(("setStateForItem opacity: %f\n", state->opacity));
544 }
546 void
547 CairoRenderer::renderItem(CairoRenderContext *ctx, SPItem *item)
548 {
549 ctx->pushState();
550 setStateForItem(ctx, item);
552 CairoRenderState *state = ctx->getCurrentState();
553 state->need_layer = ( state->mask || state->clip_path || state->opacity != 1.0 );
555 // Draw item on a temporary surface so a mask, clip path, or opacity can be applied to it.
556 if (state->need_layer) {
557 state->merge_opacity = FALSE;
558 ctx->pushLayer();
559 }
560 Geom::Matrix tempmat (item->transform);
561 ctx->transform(&tempmat);
562 sp_item_invoke_render(item, ctx);
564 if (state->need_layer)
565 ctx->popLayer();
567 ctx->popState();
568 }
570 bool
571 CairoRenderer::setupDocument(CairoRenderContext *ctx, SPDocument *doc, bool pageBoundingBox, SPItem *base)
572 {
573 g_assert( ctx != NULL );
575 if (!base)
576 base = SP_ITEM(sp_document_root(doc));
578 NRRect d;
579 if (pageBoundingBox) {
580 d.x0 = d.y0 = 0;
581 d.x1 = ceil(sp_document_width(doc));
582 d.y1 = ceil(sp_document_height(doc));
583 } else {
584 sp_item_invoke_bbox(base, &d, sp_item_i2r_affine(base), TRUE, SPItem::RENDERING_BBOX);
585 }
587 if (ctx->_vector_based_target) {
588 // convert from px to pt
589 d.x0 *= PT_PER_PX;
590 d.x1 *= PT_PER_PX;
591 d.y0 *= PT_PER_PX;
592 d.y1 *= PT_PER_PX;
593 }
595 ctx->_width = d.x1-d.x0;
596 ctx->_height = d.y1-d.y0;
598 TRACE(("setupDocument: %f x %f\n", ctx->_width, ctx->_height));
600 bool ret = ctx->setupSurface(ctx->_width, ctx->_height);
602 if (ret && !pageBoundingBox)
603 {
604 double high = sp_document_height(doc);
605 if (ctx->_vector_based_target)
606 high *= PT_PER_PX;
608 Geom::Matrix tp(Geom::Translate(-d.x0 * (ctx->_vector_based_target ? PX_PER_PT : 1.0),
609 (d.y1 - high) * (ctx->_vector_based_target ? PX_PER_PT : 1.0)));
610 ctx->transform(&tp);
611 }
613 return ret;
614 }
616 #include "macros.h" // SP_PRINT_*
618 // Apply an SVG clip path
619 void
620 CairoRenderer::applyClipPath(CairoRenderContext *ctx, SPClipPath const *cp)
621 {
622 g_assert( ctx != NULL && ctx->_is_valid );
624 if (cp == NULL)
625 return;
627 CairoRenderContext::CairoRenderMode saved_mode = ctx->getRenderMode();
628 ctx->setRenderMode(CairoRenderContext::RENDER_MODE_CLIP);
630 Geom::Matrix saved_ctm;
631 if (cp->clipPathUnits == SP_CONTENT_UNITS_OBJECTBOUNDINGBOX) {
632 //SP_PRINT_DRECT("clipd", cp->display->bbox);
633 NRRect clip_bbox(cp->display->bbox);
634 Geom::Matrix t(Geom::Scale(clip_bbox.x1 - clip_bbox.x0, clip_bbox.y1 - clip_bbox.y0));
635 t[4] = clip_bbox.x0;
636 t[5] = clip_bbox.y0;
637 t *= ctx->getCurrentState()->transform;
638 ctx->getTransform(&saved_ctm);
639 ctx->setTransform(&t);
640 }
642 TRACE(("BEGIN clip\n"));
643 SPObject *co = SP_OBJECT(cp);
644 for (SPObject *child = sp_object_first_child(co) ; child != NULL; child = SP_OBJECT_NEXT(child) ) {
645 if (SP_IS_ITEM(child)) {
646 SPItem *item = SP_ITEM(child);
648 // combine transform of the item in clippath and the item using clippath:
649 Geom::Matrix tempmat (item->transform);
650 tempmat = tempmat * (ctx->getCurrentState()->item_transform);
652 // render this item in clippath
653 ctx->pushState();
654 ctx->transform(&tempmat);
655 setStateForItem(ctx, item);
656 sp_item_invoke_render(item, ctx);
657 ctx->popState();
658 }
659 }
660 TRACE(("END clip\n"));
662 // do clipping only if this was the first call to applyClipPath
663 if (ctx->getClipMode() == CairoRenderContext::CLIP_MODE_PATH
664 && saved_mode == CairoRenderContext::RENDER_MODE_NORMAL)
665 cairo_clip(ctx->_cr);
667 if (cp->clipPathUnits == SP_CONTENT_UNITS_OBJECTBOUNDINGBOX)
668 ctx->setTransform(&saved_ctm);
670 ctx->setRenderMode(saved_mode);
671 }
673 // Apply an SVG mask
674 void
675 CairoRenderer::applyMask(CairoRenderContext *ctx, SPMask const *mask)
676 {
677 g_assert( ctx != NULL && ctx->_is_valid );
679 if (mask == NULL)
680 return;
682 //SP_PRINT_DRECT("maskd", &mask->display->bbox);
683 NRRect mask_bbox(mask->display->bbox);
684 // TODO: should the bbox be transformed if maskUnits != userSpaceOnUse ?
685 if (mask->maskContentUnits == SP_CONTENT_UNITS_OBJECTBOUNDINGBOX) {
686 Geom::Matrix t(Geom::Scale(mask_bbox.x1 - mask_bbox.x0, mask_bbox.y1 - mask_bbox.y0));
687 t[4] = mask_bbox.x0;
688 t[5] = mask_bbox.y0;
689 t *= ctx->getCurrentState()->transform;
690 ctx->setTransform(&t);
691 }
693 // Clip mask contents... but...
694 // The mask's bounding box is the "geometric bounding box" which doesn't allow for
695 // filters which extend outside the bounding box. So don't clip.
696 // ctx->addClippingRect(mask_bbox.x0, mask_bbox.y0, mask_bbox.x1 - mask_bbox.x0, mask_bbox.y1 - mask_bbox.y0);
698 ctx->pushState();
700 TRACE(("BEGIN mask\n"));
701 SPObject *co = SP_OBJECT(mask);
702 for (SPObject *child = sp_object_first_child(co) ; child != NULL; child = SP_OBJECT_NEXT(child) ) {
703 if (SP_IS_ITEM(child)) {
704 SPItem *item = SP_ITEM(child);
705 renderItem(ctx, item);
706 }
707 }
708 TRACE(("END mask\n"));
710 ctx->popState();
711 }
713 void
714 calculatePreserveAspectRatio(unsigned int aspect_align, unsigned int aspect_clip, double vp_width, double vp_height,
715 double *x, double *y, double *width, double *height)
716 {
717 if (aspect_align == SP_ASPECT_NONE)
718 return;
720 double scalex, scaley, scale;
721 double new_width, new_height;
722 scalex = *width / vp_width;
723 scaley = *height / vp_height;
724 scale = (aspect_clip == SP_ASPECT_MEET) ? MIN(scalex, scaley) : MAX(scalex, scaley);
725 new_width = vp_width * scale;
726 new_height = vp_height * scale;
727 /* Now place viewbox to requested position */
728 switch (aspect_align) {
729 case SP_ASPECT_XMIN_YMIN:
730 break;
731 case SP_ASPECT_XMID_YMIN:
732 *x -= 0.5 * (new_width - *width);
733 break;
734 case SP_ASPECT_XMAX_YMIN:
735 *x -= 1.0 * (new_width - *width);
736 break;
737 case SP_ASPECT_XMIN_YMID:
738 *y -= 0.5 * (new_height - *height);
739 break;
740 case SP_ASPECT_XMID_YMID:
741 *x -= 0.5 * (new_width - *width);
742 *y -= 0.5 * (new_height - *height);
743 break;
744 case SP_ASPECT_XMAX_YMID:
745 *x -= 1.0 * (new_width - *width);
746 *y -= 0.5 * (new_height - *height);
747 break;
748 case SP_ASPECT_XMIN_YMAX:
749 *y -= 1.0 * (new_height - *height);
750 break;
751 case SP_ASPECT_XMID_YMAX:
752 *x -= 0.5 * (new_width - *width);
753 *y -= 1.0 * (new_height - *height);
754 break;
755 case SP_ASPECT_XMAX_YMAX:
756 *x -= 1.0 * (new_width - *width);
757 *y -= 1.0 * (new_height - *height);
758 break;
759 default:
760 break;
761 }
762 *width = new_width;
763 *height = new_height;
764 }
766 #include "clear-n_.h"
768 } /* namespace Internal */
769 } /* namespace Extension */
770 } /* namespace Inkscape */
772 #undef TRACE
774 /* End of GNU GPL code */
776 /*
777 Local Variables:
778 mode:c++
779 c-file-style:"stroustrup"
780 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
781 indent-tabs-mode:nil
782 fill-column:99
783 End:
784 */
785 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :