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 static void sp_shape_render_invoke_marker_rendering(SPMarker* marker, Geom::Matrix tr, SPStyle* style, CairoRenderContext *ctx)
159 {
160 bool render = true;
161 if (marker->markerUnits == SP_MARKER_UNITS_STROKEWIDTH) {
162 if (style->stroke_width.computed > 1e-9) {
163 tr = Geom::Scale(style->stroke_width.computed) * tr;
164 } else {
165 render = false; // stroke width zero and marker is thus scaled down to zero, skip
166 }
167 }
169 if (render) {
170 SPItem* marker_item = sp_item_first_item_child (SP_OBJECT (marker));
171 tr = (Geom::Matrix)marker_item->transform * (Geom::Matrix)marker->c2p * tr;
172 Geom::Matrix old_tr = marker_item->transform;
173 marker_item->transform = tr;
174 ctx->getRenderer()->renderItem (ctx, marker_item);
175 marker_item->transform = old_tr;
176 }
177 }
179 static void sp_shape_render (SPItem *item, CairoRenderContext *ctx)
180 {
181 NRRect pbox;
183 SPShape *shape = SP_SHAPE(item);
185 if (!shape->curve) return;
187 sp_item_invoke_bbox(item, &pbox, Geom::identity(), TRUE);
189 SPStyle* style = SP_OBJECT_STYLE (item);
191 Geom::PathVector const & pathv = shape->curve->get_pathvector();
193 ctx->renderPathVector(pathv, style, &pbox);
195 for(Geom::PathVector::const_iterator path_it = pathv.begin(); path_it != pathv.end(); ++path_it) {
196 // START position
197 for (int i = 0; i < 2; i++) { // SP_MARKER_LOC and SP_MARKER_LOC_START
198 if ( shape->marker[i] ) {
199 SPMarker* marker = SP_MARKER (shape->marker[i]);
200 Geom::Matrix tr;
201 if (marker->orient_auto) {
202 tr = sp_shape_marker_get_transform_at_start(path_it->front());
203 } else {
204 tr = Geom::Rotate::from_degrees(marker->orient) * Geom::Translate(path_it->front().pointAt(0));
205 }
206 sp_shape_render_invoke_marker_rendering(marker, tr, style, ctx);
207 }
208 }
210 // MID position
211 for (int i = 0; i < 3; i += 2) { // SP_MARKER_LOC and SP_MARKER_LOC_MID
212 if ( shape->marker[i] && (path_it->size_default() > 1) ) {
213 Geom::Path::const_iterator curve_it1 = path_it->begin(); // incoming curve
214 Geom::Path::const_iterator curve_it2 = ++(path_it->begin()); // outgoing curve
215 while (curve_it2 != path_it->end_default())
216 {
217 /* Put marker between curve_it1 and curve_it2.
218 * Loop to end_default (so including closing segment), because when a path is closed,
219 * there should be a midpoint marker between last segment and closing straight line segment */
221 SPMarker* marker = SP_MARKER (shape->marker[i]);
223 Geom::Matrix tr;
224 if (marker->orient_auto) {
225 tr = sp_shape_marker_get_transform(*curve_it1, *curve_it2);
226 } else {
227 tr = Geom::Rotate::from_degrees(marker->orient) * Geom::Translate(curve_it1->pointAt(1));
228 }
230 sp_shape_render_invoke_marker_rendering(marker, tr, style, ctx);
232 ++curve_it1;
233 ++curve_it2;
234 }
235 }
236 }
238 // END position
239 for (int i = 0; i < 4; i += 3) { // SP_MARKER_LOC and SP_MARKER_LOC_END
240 if ( shape->marker[i] ) {
241 SPMarker* marker = SP_MARKER (shape->marker[i]);
243 /* Get reference to last curve in the path.
244 * For moveto-only path, this returns the "closing line segment". */
245 unsigned int index = path_it->size_default();
246 if (index > 0) {
247 index--;
248 }
249 Geom::Curve const &lastcurve = (*path_it)[index];
251 Geom::Matrix tr;
252 if (marker->orient_auto) {
253 tr = sp_shape_marker_get_transform_at_end(lastcurve);
254 } else {
255 tr = Geom::Rotate::from_degrees(marker->orient) * Geom::Translate(lastcurve.pointAt(1));
256 }
258 sp_shape_render_invoke_marker_rendering(marker, tr, style, ctx);
259 }
260 }
261 }
262 }
264 static void sp_group_render(SPItem *item, CairoRenderContext *ctx)
265 {
266 SPGroup *group = SP_GROUP(item);
267 CairoRenderer *renderer = ctx->getRenderer();
268 TRACE(("sp_group_render opacity: %f\n", SP_SCALE24_TO_FLOAT(SP_OBJECT_STYLE(item)->opacity.value)));
270 GSList *l = g_slist_reverse(group->childList(false));
271 while (l) {
272 SPObject *o = SP_OBJECT (l->data);
273 if (SP_IS_ITEM(o)) {
274 renderer->renderItem (ctx, SP_ITEM (o));
275 }
276 l = g_slist_remove (l, o);
277 }
278 }
280 static void sp_use_render(SPItem *item, CairoRenderContext *ctx)
281 {
282 bool translated = false;
283 SPUse *use = SP_USE(item);
284 CairoRenderer *renderer = ctx->getRenderer();
286 if ((use->x._set && use->x.computed != 0) || (use->y._set && use->y.computed != 0)) {
287 Geom::Matrix tp(Geom::Translate(use->x.computed, use->y.computed));
288 ctx->pushState();
289 ctx->transform(&tp);
290 translated = true;
291 }
293 if (use->child && SP_IS_ITEM(use->child)) {
294 renderer->renderItem(ctx, SP_ITEM(use->child));
295 }
297 if (translated) {
298 ctx->popState();
299 }
300 }
302 static void sp_text_render(SPItem *item, CairoRenderContext *ctx)
303 {
304 SPText *group = SP_TEXT (item);
305 group->layout.showGlyphs(ctx);
306 }
308 static void sp_flowtext_render(SPItem *item, CairoRenderContext *ctx)
309 {
310 SPFlowtext *group = SP_FLOWTEXT(item);
311 group->layout.showGlyphs(ctx);
312 }
314 static void sp_image_render(SPItem *item, CairoRenderContext *ctx)
315 {
316 SPImage *image;
317 guchar *px;
318 int w, h, rs;
320 image = SP_IMAGE (item);
322 if (!image->pixbuf) return;
323 if ((image->width.computed <= 0.0) || (image->height.computed <= 0.0)) return;
325 px = gdk_pixbuf_get_pixels (image->pixbuf);
326 w = gdk_pixbuf_get_width (image->pixbuf);
327 h = gdk_pixbuf_get_height (image->pixbuf);
328 rs = gdk_pixbuf_get_rowstride (image->pixbuf);
330 double x = image->x.computed;
331 double y = image->y.computed;
332 double width = image->width.computed;
333 double height = image->height.computed;
335 if (image->aspect_align != SP_ASPECT_NONE) {
336 calculatePreserveAspectRatio (image->aspect_align, image->aspect_clip, (double)w, (double)h,
337 &x, &y, &width, &height);
338 }
340 if (image->aspect_clip == SP_ASPECT_SLICE && !ctx->getCurrentState()->has_overflow) {
341 ctx->addClippingRect(image->x.computed, image->y.computed, image->width.computed, image->height.computed);
342 }
344 Geom::Translate tp(x, y);
345 Geom::Scale s(width / (double)w, height / (double)h);
346 Geom::Matrix t(s * tp);
348 ctx->renderImage (px, w, h, rs, &t, SP_OBJECT_STYLE (item));
349 }
351 static void sp_symbol_render(SPItem *item, CairoRenderContext *ctx)
352 {
353 SPSymbol *symbol = SP_SYMBOL(item);
354 if (!SP_OBJECT_IS_CLONED (symbol))
355 return;
357 /* Cloned <symbol> is actually renderable */
358 ctx->pushState();
359 ctx->transform(&symbol->c2p);
361 // apply viewbox if set
362 if (0 /*symbol->viewBox_set*/) {
363 Geom::Matrix vb2user;
364 double x, y, width, height;
365 double view_width, view_height;
366 x = 0.0;
367 y = 0.0;
368 width = 1.0;
369 height = 1.0;
371 view_width = symbol->viewBox.x1 - symbol->viewBox.x0;
372 view_height = symbol->viewBox.y1 - symbol->viewBox.y0;
374 calculatePreserveAspectRatio(symbol->aspect_align, symbol->aspect_clip, view_width, view_height,
375 &x, &y,&width, &height);
377 // [itemTransform *] translate(x, y) * scale(w/vw, h/vh) * translate(-vx, -vy);
378 vb2user = Geom::identity();
379 vb2user[0] = width / view_width;
380 vb2user[3] = height / view_height;
381 vb2user[4] = x - symbol->viewBox.x0 * vb2user[0];
382 vb2user[5] = y - symbol->viewBox.y0 * vb2user[3];
384 ctx->transform(&vb2user);
385 }
387 sp_group_render(item, ctx);
388 ctx->popState();
389 }
391 static void sp_root_render(SPItem *item, CairoRenderContext *ctx)
392 {
393 SPRoot *root = SP_ROOT(item);
394 CairoRenderer *renderer = ctx->getRenderer();
396 if (!ctx->getCurrentState()->has_overflow && SP_OBJECT(item)->parent)
397 ctx->addClippingRect(root->x.computed, root->y.computed, root->width.computed, root->height.computed);
399 ctx->pushState();
400 renderer->setStateForItem(ctx, item);
401 Geom::Matrix tempmat (root->c2p);
402 ctx->transform(&tempmat);
403 sp_group_render(item, ctx);
404 ctx->popState();
405 }
407 /**
408 This function converts the item to a raster image and includes the image into the cairo renderer.
409 It is only used for filters and then only when rendering filters as bitmaps is requested.
410 */
411 static void sp_asbitmap_render(SPItem *item, CairoRenderContext *ctx)
412 {
414 // The code was adapted from sp_selection_create_bitmap_copy in selection-chemistry.cpp
416 // Calculate resolution
417 double res;
418 /** @TODO reimplement the resolution stuff (WHY?)
419 */
420 res = ctx->getBitmapResolution();
421 if(res == 0) {
422 res = PX_PER_IN;
423 }
424 TRACE(("sp_asbitmap_render: resolution: %f\n", res ));
426 // Get the bounding box of the selection in document coordinates.
427 Geom::OptRect bbox =
428 item->getBounds(sp_item_i2d_affine(item), SPItem::RENDERING_BBOX);
430 if (!bbox) // no bbox, e.g. empty group
431 return;
433 // The width and height of the bitmap in pixels
434 unsigned width = (unsigned) floor ((bbox->max()[Geom::X] - bbox->min()[Geom::X]) * (res / PX_PER_IN));
435 unsigned height =(unsigned) floor ((bbox->max()[Geom::Y] - bbox->min()[Geom::Y]) * (res / PX_PER_IN));
437 // Scale to exactly fit integer bitmap inside bounding box
438 double scale_x = (bbox->max()[Geom::X] - bbox->min()[Geom::X]) / width;
439 double scale_y = (bbox->max()[Geom::Y] - bbox->min()[Geom::Y]) / height;
441 // Location of bounding box in document coordinates.
442 double shift_x = bbox->min()[Geom::X];
443 double shift_y = bbox->max()[Geom::Y];
445 // For default 90 dpi, snap bitmap to pixel grid
446 if (res == PX_PER_IN) {
447 shift_x = round (shift_x);
448 shift_y = -round (-shift_y); // Correct rounding despite coordinate inversion.
449 // Remove the negations when the inversion is gone.
450 }
452 // Calculate the matrix that will be applied to the image so that it exactly overlaps the source objects
454 // Matix to put bitmap in correct place on document
455 Geom::Matrix t_on_document = (Geom::Matrix)(Geom::Scale (scale_x, -scale_y)) *
456 (Geom::Matrix)(Geom::Translate (shift_x, shift_y));
458 // ctx matrix already includes item transformation. We must substract.
459 Geom::Matrix t_item = sp_item_i2d_affine (item);
460 Geom::Matrix t = t_on_document * t_item.inverse();
462 // Do the export
463 SPDocument *document = SP_OBJECT(item)->document;
464 GSList *items = NULL;
465 items = g_slist_append(items, item);
467 GdkPixbuf *pb = sp_generate_internal_bitmap(document, NULL,
468 bbox->min()[Geom::X], bbox->min()[Geom::Y], bbox->max()[Geom::X], bbox->max()[Geom::Y],
469 width, height, res, res, (guint32) 0xffffff00, items );
471 if (pb) {
472 TEST(gdk_pixbuf_save( pb, "bitmap.png", "png", NULL, NULL ));
473 unsigned char *px = gdk_pixbuf_get_pixels (pb);
474 unsigned int w = gdk_pixbuf_get_width(pb);
475 unsigned int h = gdk_pixbuf_get_height(pb);
476 unsigned int rs = gdk_pixbuf_get_rowstride(pb);
477 ctx->renderImage (px, w, h, rs, &t, SP_OBJECT_STYLE (item));
478 gdk_pixbuf_unref (pb);
479 }
480 g_slist_free (items);
481 }
484 static void sp_item_invoke_render(SPItem *item, CairoRenderContext *ctx)
485 {
486 // Check item's visibility
487 if (item->isHidden()) {
488 return;
489 }
491 SPStyle* style = SP_OBJECT_STYLE (item);
492 if((ctx->getFilterToBitmap() == TRUE) && (style->filter.set != 0)) {
493 return sp_asbitmap_render(item, ctx);
494 }
496 if (SP_IS_ROOT(item)) {
497 TRACE(("root\n"));
498 return sp_root_render(item, ctx);
499 } else if (SP_IS_GROUP(item)) {
500 TRACE(("group\n"));
501 return sp_group_render(item, ctx);
502 } else if (SP_IS_SHAPE(item)) {
503 TRACE(("shape\n"));
504 return sp_shape_render(item, ctx);
505 } else if (SP_IS_USE(item)) {
506 TRACE(("use begin---\n"));
507 sp_use_render(item, ctx);
508 TRACE(("---use end\n"));
509 } else if (SP_IS_SYMBOL(item)) {
510 TRACE(("symbol\n"));
511 return sp_symbol_render(item, ctx);
512 } else if (SP_IS_TEXT(item)) {
513 TRACE(("text\n"));
514 return sp_text_render(item, ctx);
515 } else if (SP_IS_FLOWTEXT(item)) {
516 TRACE(("flowtext\n"));
517 return sp_flowtext_render(item, ctx);
518 } else if (SP_IS_IMAGE(item)) {
519 TRACE(("image\n"));
520 return sp_image_render(item, ctx);
521 }
522 }
524 void
525 CairoRenderer::setStateForItem(CairoRenderContext *ctx, SPItem const *item)
526 {
527 SPStyle const *style = SP_OBJECT_STYLE(item);
528 ctx->setStateForStyle(style);
530 CairoRenderState *state = ctx->getCurrentState();
531 state->clip_path = item->clip_ref->getObject();
532 state->mask = item->mask_ref->getObject();
533 state->item_transform = Geom::Matrix (item->transform);
535 // If parent_has_userspace is true the parent state's transform
536 // has to be used for the mask's/clippath's context.
537 // This is so because we use the image's/(flow)text's transform for positioning
538 // instead of explicitly specifying it and letting the renderer do the
539 // transformation before rendering the item.
540 if (SP_IS_TEXT(item) || SP_IS_FLOWTEXT(item) || SP_IS_IMAGE(item))
541 state->parent_has_userspace = TRUE;
542 TRACE(("setStateForItem opacity: %f\n", state->opacity));
543 }
545 void
546 CairoRenderer::renderItem(CairoRenderContext *ctx, SPItem *item)
547 {
548 ctx->pushState();
549 setStateForItem(ctx, item);
551 CairoRenderState *state = ctx->getCurrentState();
552 state->need_layer = ( state->mask || state->clip_path || state->opacity != 1.0 );
554 // Draw item on a temporary surface so a mask, clip path, or opacity can be applied to it.
555 if (state->need_layer) {
556 state->merge_opacity = FALSE;
557 ctx->pushLayer();
558 }
559 Geom::Matrix tempmat (item->transform);
560 ctx->transform(&tempmat);
561 sp_item_invoke_render(item, ctx);
563 if (state->need_layer)
564 ctx->popLayer();
566 ctx->popState();
567 }
569 bool
570 CairoRenderer::setupDocument(CairoRenderContext *ctx, SPDocument *doc, bool pageBoundingBox, SPItem *base)
571 {
572 g_assert( ctx != NULL );
574 if (!base)
575 base = SP_ITEM(sp_document_root(doc));
577 NRRect d;
578 if (pageBoundingBox) {
579 d.x0 = d.y0 = 0;
580 d.x1 = ceil(sp_document_width(doc));
581 d.y1 = ceil(sp_document_height(doc));
582 } else {
583 sp_item_invoke_bbox(base, &d, sp_item_i2d_affine(base), TRUE, SPItem::RENDERING_BBOX);
584 }
586 if (ctx->_vector_based_target) {
587 // convert from px to pt
588 d.x0 *= PT_PER_PX;
589 d.x1 *= PT_PER_PX;
590 d.y0 *= PT_PER_PX;
591 d.y1 *= PT_PER_PX;
592 }
594 ctx->_width = d.x1-d.x0;
595 ctx->_height = d.y1-d.y0;
597 TRACE(("setupDocument: %f x %f\n", ctx->_width, ctx->_height));
599 bool ret = ctx->setupSurface(ctx->_width, ctx->_height);
601 if (ret && !pageBoundingBox)
602 {
603 double high = sp_document_height(doc);
604 if (ctx->_vector_based_target)
605 high *= PT_PER_PX;
607 Geom::Matrix tp(Geom::Translate(-d.x0 * (ctx->_vector_based_target ? PX_PER_PT : 1.0),
608 (d.y1 - high) * (ctx->_vector_based_target ? PX_PER_PT : 1.0)));
609 ctx->transform(&tp);
610 }
612 return ret;
613 }
615 #include "macros.h" // SP_PRINT_*
617 // Apply an SVG clip path
618 void
619 CairoRenderer::applyClipPath(CairoRenderContext *ctx, SPClipPath const *cp)
620 {
621 g_assert( ctx != NULL && ctx->_is_valid );
623 if (cp == NULL)
624 return;
626 CairoRenderContext::CairoRenderMode saved_mode = ctx->getRenderMode();
627 ctx->setRenderMode(CairoRenderContext::RENDER_MODE_CLIP);
629 Geom::Matrix saved_ctm;
630 if (cp->clipPathUnits == SP_CONTENT_UNITS_OBJECTBOUNDINGBOX) {
631 //SP_PRINT_DRECT("clipd", cp->display->bbox);
632 NRRect clip_bbox(cp->display->bbox);
633 Geom::Matrix t(Geom::Scale(clip_bbox.x1 - clip_bbox.x0, clip_bbox.y1 - clip_bbox.y0));
634 t[4] = clip_bbox.x0;
635 t[5] = clip_bbox.y0;
636 t *= ctx->getCurrentState()->transform;
637 ctx->getTransform(&saved_ctm);
638 ctx->setTransform(&t);
639 }
641 TRACE(("BEGIN clip\n"));
642 SPObject *co = SP_OBJECT(cp);
643 for (SPObject *child = sp_object_first_child(co) ; child != NULL; child = SP_OBJECT_NEXT(child) ) {
644 if (SP_IS_ITEM(child)) {
645 SPItem *item = SP_ITEM(child);
647 // combine transform of the item in clippath and the item using clippath:
648 Geom::Matrix tempmat (item->transform);
649 tempmat = tempmat * (ctx->getCurrentState()->item_transform);
651 // render this item in clippath
652 ctx->pushState();
653 ctx->transform(&tempmat);
654 setStateForItem(ctx, item);
655 sp_item_invoke_render(item, ctx);
656 ctx->popState();
657 }
658 }
659 TRACE(("END clip\n"));
661 // do clipping only if this was the first call to applyClipPath
662 if (ctx->getClipMode() == CairoRenderContext::CLIP_MODE_PATH
663 && saved_mode == CairoRenderContext::RENDER_MODE_NORMAL)
664 cairo_clip(ctx->_cr);
666 if (cp->clipPathUnits == SP_CONTENT_UNITS_OBJECTBOUNDINGBOX)
667 ctx->setTransform(&saved_ctm);
669 ctx->setRenderMode(saved_mode);
670 }
672 // Apply an SVG mask
673 void
674 CairoRenderer::applyMask(CairoRenderContext *ctx, SPMask const *mask)
675 {
676 g_assert( ctx != NULL && ctx->_is_valid );
678 if (mask == NULL)
679 return;
681 //SP_PRINT_DRECT("maskd", &mask->display->bbox);
682 NRRect mask_bbox(mask->display->bbox);
683 // TODO: should the bbox be transformed if maskUnits != userSpaceOnUse ?
684 if (mask->maskContentUnits == SP_CONTENT_UNITS_OBJECTBOUNDINGBOX) {
685 Geom::Matrix t(Geom::Scale(mask_bbox.x1 - mask_bbox.x0, mask_bbox.y1 - mask_bbox.y0));
686 t[4] = mask_bbox.x0;
687 t[5] = mask_bbox.y0;
688 t *= ctx->getCurrentState()->transform;
689 ctx->setTransform(&t);
690 }
692 // Clip mask contents... but...
693 // The mask's bounding box is the "geometric bounding box" which doesn't allow for
694 // filters which extend outside the bounding box. So don't clip.
695 // ctx->addClippingRect(mask_bbox.x0, mask_bbox.y0, mask_bbox.x1 - mask_bbox.x0, mask_bbox.y1 - mask_bbox.y0);
697 ctx->pushState();
699 TRACE(("BEGIN mask\n"));
700 SPObject *co = SP_OBJECT(mask);
701 for (SPObject *child = sp_object_first_child(co) ; child != NULL; child = SP_OBJECT_NEXT(child) ) {
702 if (SP_IS_ITEM(child)) {
703 SPItem *item = SP_ITEM(child);
704 renderItem(ctx, item);
705 }
706 }
707 TRACE(("END mask\n"));
709 ctx->popState();
710 }
712 void
713 calculatePreserveAspectRatio(unsigned int aspect_align, unsigned int aspect_clip, double vp_width, double vp_height,
714 double *x, double *y, double *width, double *height)
715 {
716 if (aspect_align == SP_ASPECT_NONE)
717 return;
719 double scalex, scaley, scale;
720 double new_width, new_height;
721 scalex = *width / vp_width;
722 scaley = *height / vp_height;
723 scale = (aspect_clip == SP_ASPECT_MEET) ? MIN(scalex, scaley) : MAX(scalex, scaley);
724 new_width = vp_width * scale;
725 new_height = vp_height * scale;
726 /* Now place viewbox to requested position */
727 switch (aspect_align) {
728 case SP_ASPECT_XMIN_YMIN:
729 break;
730 case SP_ASPECT_XMID_YMIN:
731 *x -= 0.5 * (new_width - *width);
732 break;
733 case SP_ASPECT_XMAX_YMIN:
734 *x -= 1.0 * (new_width - *width);
735 break;
736 case SP_ASPECT_XMIN_YMID:
737 *y -= 0.5 * (new_height - *height);
738 break;
739 case SP_ASPECT_XMID_YMID:
740 *x -= 0.5 * (new_width - *width);
741 *y -= 0.5 * (new_height - *height);
742 break;
743 case SP_ASPECT_XMAX_YMID:
744 *x -= 1.0 * (new_width - *width);
745 *y -= 0.5 * (new_height - *height);
746 break;
747 case SP_ASPECT_XMIN_YMAX:
748 *y -= 1.0 * (new_height - *height);
749 break;
750 case SP_ASPECT_XMID_YMAX:
751 *x -= 0.5 * (new_width - *width);
752 *y -= 1.0 * (new_height - *height);
753 break;
754 case SP_ASPECT_XMAX_YMAX:
755 *x -= 1.0 * (new_width - *width);
756 *y -= 1.0 * (new_height - *height);
757 break;
758 default:
759 break;
760 }
761 *width = new_width;
762 *height = new_height;
763 }
765 #include "clear-n_.h"
767 } /* namespace Internal */
768 } /* namespace Extension */
769 } /* namespace Inkscape */
771 #undef TRACE
773 /* End of GNU GPL code */
775 /*
776 Local Variables:
777 mode:c++
778 c-file-style:"stroustrup"
779 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
780 indent-tabs-mode:nil
781 fill-column:99
782 End:
783 */
784 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :