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(sp_shape_marker_get_transform_at_start(path_it->front()));
185 if (marker->markerUnits == SP_MARKER_UNITS_STROKEWIDTH) {
186 tr = Geom::Scale(style->stroke_width.computed) * tr;
187 }
189 tr = (Geom::Matrix)marker_item->transform * (Geom::Matrix)marker->c2p * tr;
191 Geom::Matrix old_tr = marker_item->transform;
192 marker_item->transform = tr;
193 renderer->renderItem (ctx, marker_item);
194 marker_item->transform = old_tr;
195 }
197 if ( shape->marker[SP_MARKER_LOC_MID] && (path_it->size_default() > 1) ) {
198 Geom::Path::const_iterator curve_it1 = path_it->begin(); // incoming curve
199 Geom::Path::const_iterator curve_it2 = ++(path_it->begin()); // outgoing curve
200 while (curve_it2 != path_it->end_default())
201 {
202 /* Put marker between curve_it1 and curve_it2.
203 * Loop to end_default (so including closing segment), because when a path is closed,
204 * there should be a midpoint marker between last segment and closing straight line segment */
206 SPMarker* marker = SP_MARKER (shape->marker[SP_MARKER_LOC_MID]);
207 SPItem* marker_item = sp_item_first_item_child (SP_OBJECT (shape->marker[SP_MARKER_LOC_MID]));
209 Geom::Matrix tr(sp_shape_marker_get_transform(*curve_it1, *curve_it2));
211 if (marker->markerUnits == SP_MARKER_UNITS_STROKEWIDTH) {
212 tr = Geom::Scale(style->stroke_width.computed) * tr;
213 }
215 tr = (Geom::Matrix)marker_item->transform * (Geom::Matrix)marker->c2p * tr;
217 Geom::Matrix old_tr = marker_item->transform;
218 marker_item->transform = tr;
219 renderer->renderItem (ctx, marker_item);
220 marker_item->transform = old_tr;
222 ++curve_it1;
223 ++curve_it2;
224 }
225 }
227 if ( shape->marker[SP_MARKER_LOC_END] ) {
228 SPMarker* marker = SP_MARKER (shape->marker[SP_MARKER_LOC_END]);
229 SPItem* marker_item = sp_item_first_item_child (SP_OBJECT (shape->marker[SP_MARKER_LOC_END]));
231 /* Get reference to last curve in the path.
232 * For moveto-only path, this returns the "closing line segment". */
233 unsigned int index = path_it->size_default();
234 if (index > 0) {
235 index--;
236 }
237 Geom::Curve const &lastcurve = (*path_it)[index];
239 Geom::Matrix tr = sp_shape_marker_get_transform_at_end(lastcurve);
241 if (marker->markerUnits == SP_MARKER_UNITS_STROKEWIDTH) {
242 tr = Geom::Scale(style->stroke_width.computed) * tr;
243 }
245 tr = (Geom::Matrix)marker_item->transform * (Geom::Matrix)marker->c2p * tr;
247 Geom::Matrix old_tr = marker_item->transform;
248 marker_item->transform = tr;
249 renderer->renderItem (ctx, marker_item);
250 marker_item->transform = old_tr;
251 }
252 }
253 }
255 static void sp_group_render(SPItem *item, CairoRenderContext *ctx)
256 {
257 SPGroup *group = SP_GROUP(item);
258 CairoRenderer *renderer = ctx->getRenderer();
259 TRACE(("sp_group_render opacity: %f\n", SP_SCALE24_TO_FLOAT(SP_OBJECT_STYLE(item)->opacity.value)));
261 GSList *l = g_slist_reverse(group->childList(false));
262 while (l) {
263 SPObject *o = SP_OBJECT (l->data);
264 if (SP_IS_ITEM(o)) {
265 renderer->renderItem (ctx, SP_ITEM (o));
266 }
267 l = g_slist_remove (l, o);
268 }
269 }
271 static void sp_use_render(SPItem *item, CairoRenderContext *ctx)
272 {
273 bool translated = false;
274 SPUse *use = SP_USE(item);
275 CairoRenderer *renderer = ctx->getRenderer();
277 if ((use->x._set && use->x.computed != 0) || (use->y._set && use->y.computed != 0)) {
278 Geom::Matrix tp(Geom::Translate(use->x.computed, use->y.computed));
279 ctx->pushState();
280 ctx->transform(&tp);
281 translated = true;
282 }
284 if (use->child && SP_IS_ITEM(use->child)) {
285 renderer->renderItem(ctx, SP_ITEM(use->child));
286 }
288 if (translated) {
289 ctx->popState();
290 }
291 }
293 static void sp_text_render(SPItem *item, CairoRenderContext *ctx)
294 {
295 SPText *group = SP_TEXT (item);
296 group->layout.showGlyphs(ctx);
297 }
299 static void sp_flowtext_render(SPItem *item, CairoRenderContext *ctx)
300 {
301 SPFlowtext *group = SP_FLOWTEXT(item);
302 group->layout.showGlyphs(ctx);
303 }
305 static void sp_image_render(SPItem *item, CairoRenderContext *ctx)
306 {
307 SPImage *image;
308 guchar *px;
309 int w, h, rs;
311 image = SP_IMAGE (item);
313 if (!image->pixbuf) return;
314 if ((image->width.computed <= 0.0) || (image->height.computed <= 0.0)) return;
316 px = gdk_pixbuf_get_pixels (image->pixbuf);
317 w = gdk_pixbuf_get_width (image->pixbuf);
318 h = gdk_pixbuf_get_height (image->pixbuf);
319 rs = gdk_pixbuf_get_rowstride (image->pixbuf);
321 double x = image->x.computed;
322 double y = image->y.computed;
323 double width = image->width.computed;
324 double height = image->height.computed;
326 if (image->aspect_align != SP_ASPECT_NONE) {
327 calculatePreserveAspectRatio (image->aspect_align, image->aspect_clip, (double)w, (double)h,
328 &x, &y, &width, &height);
329 }
331 if (image->aspect_clip == SP_ASPECT_SLICE && !ctx->getCurrentState()->has_overflow) {
332 ctx->addClippingRect(image->x.computed, image->y.computed, image->width.computed, image->height.computed);
333 }
335 Geom::Translate tp(x, y);
336 Geom::Scale s(width / (double)w, height / (double)h);
337 Geom::Matrix t(s * tp);
339 ctx->renderImage (px, w, h, rs, &t, SP_OBJECT_STYLE (item));
340 }
342 static void sp_symbol_render(SPItem *item, CairoRenderContext *ctx)
343 {
344 SPSymbol *symbol = SP_SYMBOL(item);
345 if (!SP_OBJECT_IS_CLONED (symbol))
346 return;
348 /* Cloned <symbol> is actually renderable */
349 ctx->pushState();
350 ctx->transform(&symbol->c2p);
352 // apply viewbox if set
353 if (0 /*symbol->viewBox_set*/) {
354 Geom::Matrix vb2user;
355 double x, y, width, height;
356 double view_width, view_height;
357 x = 0.0;
358 y = 0.0;
359 width = 1.0;
360 height = 1.0;
362 view_width = symbol->viewBox.x1 - symbol->viewBox.x0;
363 view_height = symbol->viewBox.y1 - symbol->viewBox.y0;
365 calculatePreserveAspectRatio(symbol->aspect_align, symbol->aspect_clip, view_width, view_height,
366 &x, &y,&width, &height);
368 // [itemTransform *] translate(x, y) * scale(w/vw, h/vh) * translate(-vx, -vy);
369 vb2user = Geom::identity();
370 vb2user[0] = width / view_width;
371 vb2user[3] = height / view_height;
372 vb2user[4] = x - symbol->viewBox.x0 * vb2user[0];
373 vb2user[5] = y - symbol->viewBox.y0 * vb2user[3];
375 ctx->transform(&vb2user);
376 }
378 sp_group_render(item, ctx);
379 ctx->popState();
380 }
382 static void sp_root_render(SPItem *item, CairoRenderContext *ctx)
383 {
384 SPRoot *root = SP_ROOT(item);
385 CairoRenderer *renderer = ctx->getRenderer();
387 if (!ctx->getCurrentState()->has_overflow && SP_OBJECT(item)->parent)
388 ctx->addClippingRect(root->x.computed, root->y.computed, root->width.computed, root->height.computed);
390 ctx->pushState();
391 renderer->setStateForItem(ctx, item);
392 Geom::Matrix tempmat (root->c2p);
393 ctx->transform(&tempmat);
394 sp_group_render(item, ctx);
395 ctx->popState();
396 }
398 /**
399 This function converts the item to a raster image and includes the image into the cairo renderer.
400 It is only used for filters and then only when rendering filters as bitmaps is requested.
401 */
402 static void sp_asbitmap_render(SPItem *item, CairoRenderContext *ctx)
403 {
405 // The code was adapted from sp_selection_create_bitmap_copy in selection-chemistry.cpp
407 // Calculate resolution
408 double res;
409 /** @TODO reimplement the resolution stuff (WHY?)
410 */
411 res = ctx->getBitmapResolution();
412 if(res == 0) {
413 res = PX_PER_IN;
414 }
415 TRACE(("sp_asbitmap_render: resolution: %f\n", res ));
417 // Get the bounding box of the selection in document coordinates.
418 NRRect bbox(item->getBounds(sp_item_i2d_affine(item), SPItem::RENDERING_BBOX ));
420 // The width and height of the bitmap in pixels
421 unsigned width = (unsigned) floor ((bbox.x1 - bbox.x0) * (res / PX_PER_IN));
422 unsigned height =(unsigned) floor ((bbox.y1 - bbox.y0) * (res / PX_PER_IN));
424 // Scale to exactly fit integer bitmap inside bounding box
425 double scale_x = (bbox.x1 - bbox.x0) / width;
426 double scale_y = (bbox.y1 - bbox.y0) / height;
428 // Location of bounding box in document coordinates.
429 double shift_x = bbox.x0;
430 double shift_y = bbox.y1;
432 // For default 90 dpi, snap bitmap to pixel grid
433 if (res == PX_PER_IN) {
434 shift_x = round (shift_x);
435 shift_y = -round (-shift_y); // Correct rounding despite coordinate inversion.
436 // Remove the negations when the inversion is gone.
437 }
439 // Calculate the matrix that will be applied to the image so that it exactly overlaps the source objects
441 // Matix to put bitmap in correct place on document
442 Geom::Matrix t_on_document = (Geom::Matrix)(Geom::Scale (scale_x, -scale_y)) *
443 (Geom::Matrix)(Geom::Translate (shift_x, shift_y));
445 // ctx matrix already includes item transformation. We must substract.
446 Geom::Matrix t_item = sp_item_i2d_affine (item);
447 Geom::Matrix t = t_on_document * t_item.inverse();
449 // Do the export
450 SPDocument *document = SP_OBJECT(item)->document;
451 GSList *items = NULL;
452 items = g_slist_append(items, item);
454 GdkPixbuf *pb = sp_generate_internal_bitmap(document, NULL,
455 bbox.x0, bbox.y0, bbox.x1, bbox.y1, width, height, res, res, (guint32) 0xffffff00, items );
457 if (pb) {
458 TEST(gdk_pixbuf_save( pb, "bitmap.png", "png", NULL, NULL ));
459 unsigned char *px = gdk_pixbuf_get_pixels (pb);
460 unsigned int w = gdk_pixbuf_get_width(pb);
461 unsigned int h = gdk_pixbuf_get_height(pb);
462 unsigned int rs = gdk_pixbuf_get_rowstride(pb);
463 ctx->renderImage (px, w, h, rs, &t, SP_OBJECT_STYLE (item));
464 gdk_pixbuf_unref (pb);
465 }
466 g_slist_free (items);
467 }
470 static void sp_item_invoke_render(SPItem *item, CairoRenderContext *ctx)
471 {
472 // Check item's visibility
473 if (item->isHidden()) {
474 return;
475 }
477 SPStyle* style = SP_OBJECT_STYLE (item);
478 if((ctx->getFilterToBitmap() == TRUE) && (style->filter.set != 0)) {
479 return sp_asbitmap_render(item, ctx);
480 }
482 if (SP_IS_ROOT(item)) {
483 TRACE(("root\n"));
484 return sp_root_render(item, ctx);
485 } else if (SP_IS_GROUP(item)) {
486 TRACE(("group\n"));
487 return sp_group_render(item, ctx);
488 } else if (SP_IS_SHAPE(item)) {
489 TRACE(("shape\n"));
490 return sp_shape_render(item, ctx);
491 } else if (SP_IS_USE(item)) {
492 TRACE(("use begin---\n"));
493 sp_use_render(item, ctx);
494 TRACE(("---use end\n"));
495 } else if (SP_IS_SYMBOL(item)) {
496 TRACE(("symbol\n"));
497 return sp_symbol_render(item, ctx);
498 } else if (SP_IS_TEXT(item)) {
499 TRACE(("text\n"));
500 return sp_text_render(item, ctx);
501 } else if (SP_IS_FLOWTEXT(item)) {
502 TRACE(("flowtext\n"));
503 return sp_flowtext_render(item, ctx);
504 } else if (SP_IS_IMAGE(item)) {
505 TRACE(("image\n"));
506 return sp_image_render(item, ctx);
507 }
508 }
510 void
511 CairoRenderer::setStateForItem(CairoRenderContext *ctx, SPItem const *item)
512 {
513 SPStyle const *style = SP_OBJECT_STYLE(item);
514 ctx->setStateForStyle(style);
516 CairoRenderState *state = ctx->getCurrentState();
517 state->clip_path = item->clip_ref->getObject();
518 state->mask = item->mask_ref->getObject();
519 state->item_transform = Geom::Matrix (item->transform);
521 // If parent_has_userspace is true the parent state's transform
522 // has to be used for the mask's/clippath's context.
523 // This is so because we use the image's/(flow)text's transform for positioning
524 // instead of explicitly specifying it and letting the renderer do the
525 // transformation before rendering the item.
526 if (SP_IS_TEXT(item) || SP_IS_FLOWTEXT(item) || SP_IS_IMAGE(item))
527 state->parent_has_userspace = TRUE;
528 TRACE(("setStateForItem opacity: %f\n", state->opacity));
529 }
531 void
532 CairoRenderer::renderItem(CairoRenderContext *ctx, SPItem *item)
533 {
534 ctx->pushState();
535 setStateForItem(ctx, item);
537 CairoRenderState *state = ctx->getCurrentState();
538 state->need_layer = ( state->mask || state->clip_path || state->opacity != 1.0 );
540 // Draw item on a temporary surface so a mask, clip path, or opacity can be applied to it.
541 if (state->need_layer) {
542 state->merge_opacity = FALSE;
543 ctx->pushLayer();
544 }
545 Geom::Matrix tempmat (item->transform);
546 ctx->transform(&tempmat);
547 sp_item_invoke_render(item, ctx);
549 if (state->need_layer)
550 ctx->popLayer();
552 ctx->popState();
553 }
555 bool
556 CairoRenderer::setupDocument(CairoRenderContext *ctx, SPDocument *doc, bool pageBoundingBox, SPItem *base)
557 {
558 g_assert( ctx != NULL );
560 if (ctx->_vector_based_target) {
561 // width and height in pt
562 ctx->_width = sp_document_width(doc) * PT_PER_PX;
563 ctx->_height = sp_document_height(doc) * PT_PER_PX;
564 } else {
565 ctx->_width = sp_document_width(doc);
566 ctx->_height = sp_document_height(doc);
567 }
569 NRRect d;
570 if (pageBoundingBox || !base) {
571 d.x0 = d.y0 = 0;
572 d.x1 = ceil(ctx->_width);
573 d.y1 = ceil(ctx->_height);
574 } else {
575 sp_item_invoke_bbox(base, &d, sp_item_i2r_affine(base), TRUE);
576 if (ctx->_vector_based_target) {
577 // convert from px to pt
578 d.x0 *= PT_PER_PX;
579 d.x1 *= PT_PER_PX;
580 d.y0 *= PT_PER_PX;
581 d.y1 *= PT_PER_PX;
582 }
583 }
584 TRACE(("setupDocument: %f x %f\n", ctx->_width, ctx->_height));
586 bool ret = ctx->setupSurface(d.x1-d.x0, d.y1-d.y0);
588 if (ret && !pageBoundingBox && base)
589 {
590 Geom::Matrix tp(Geom::Translate(-d.x0 * (ctx->_vector_based_target ? PX_PER_PT : 1.0),
591 (d.y1 - ctx->_height) * (ctx->_vector_based_target ? PX_PER_PT : 1.0)));
592 ctx->transform(&tp);
594 ctx->_width = d.x1 - d.x0;
595 ctx->_height = d.y1 - d.y0;
596 }
598 return ret;
599 }
601 #include "macros.h" // SP_PRINT_*
603 // Apply an SVG clip path
604 void
605 CairoRenderer::applyClipPath(CairoRenderContext *ctx, SPClipPath const *cp)
606 {
607 g_assert( ctx != NULL && ctx->_is_valid );
609 if (cp == NULL)
610 return;
612 CairoRenderContext::CairoRenderMode saved_mode = ctx->getRenderMode();
613 ctx->setRenderMode(CairoRenderContext::RENDER_MODE_CLIP);
615 Geom::Matrix saved_ctm;
616 if (cp->clipPathUnits == SP_CONTENT_UNITS_OBJECTBOUNDINGBOX) {
617 //SP_PRINT_DRECT("clipd", cp->display->bbox);
618 NRRect clip_bbox(cp->display->bbox);
619 Geom::Matrix t(Geom::Scale(clip_bbox.x1 - clip_bbox.x0, clip_bbox.y1 - clip_bbox.y0));
620 t[4] = clip_bbox.x0;
621 t[5] = clip_bbox.y0;
622 t *= ctx->getCurrentState()->transform;
623 ctx->getTransform(&saved_ctm);
624 ctx->setTransform(&t);
625 }
627 TRACE(("BEGIN clip\n"));
628 SPObject *co = SP_OBJECT(cp);
629 for (SPObject *child = sp_object_first_child(co) ; child != NULL; child = SP_OBJECT_NEXT(child) ) {
630 if (SP_IS_ITEM(child)) {
631 SPItem *item = SP_ITEM(child);
633 // combine transform of the item in clippath and the item using clippath:
634 Geom::Matrix tempmat (item->transform);
635 tempmat = tempmat * (ctx->getCurrentState()->item_transform);
637 // render this item in clippath
638 ctx->pushState();
639 ctx->transform(&tempmat);
640 setStateForItem(ctx, item);
641 sp_item_invoke_render(item, ctx);
642 ctx->popState();
643 }
644 }
645 TRACE(("END clip\n"));
647 // do clipping only if this was the first call to applyClipPath
648 if (ctx->getClipMode() == CairoRenderContext::CLIP_MODE_PATH
649 && saved_mode == CairoRenderContext::RENDER_MODE_NORMAL)
650 cairo_clip(ctx->_cr);
652 if (cp->clipPathUnits == SP_CONTENT_UNITS_OBJECTBOUNDINGBOX)
653 ctx->setTransform(&saved_ctm);
655 ctx->setRenderMode(saved_mode);
656 }
658 // Apply an SVG mask
659 void
660 CairoRenderer::applyMask(CairoRenderContext *ctx, SPMask const *mask)
661 {
662 g_assert( ctx != NULL && ctx->_is_valid );
664 if (mask == NULL)
665 return;
667 //SP_PRINT_DRECT("maskd", &mask->display->bbox);
668 NRRect mask_bbox(mask->display->bbox);
669 // TODO: should the bbox be transformed if maskUnits != userSpaceOnUse ?
670 if (mask->maskContentUnits == SP_CONTENT_UNITS_OBJECTBOUNDINGBOX) {
671 Geom::Matrix t(Geom::Scale(mask_bbox.x1 - mask_bbox.x0, mask_bbox.y1 - mask_bbox.y0));
672 t[4] = mask_bbox.x0;
673 t[5] = mask_bbox.y0;
674 t *= ctx->getCurrentState()->transform;
675 ctx->setTransform(&t);
676 }
678 // Clip mask contents... but...
679 // The mask's bounding box is the "geometric bounding box" which doesn't allow for
680 // filters which extend outside the bounding box. So don't clip.
681 // ctx->addClippingRect(mask_bbox.x0, mask_bbox.y0, mask_bbox.x1 - mask_bbox.x0, mask_bbox.y1 - mask_bbox.y0);
683 ctx->pushState();
685 TRACE(("BEGIN mask\n"));
686 SPObject *co = SP_OBJECT(mask);
687 for (SPObject *child = sp_object_first_child(co) ; child != NULL; child = SP_OBJECT_NEXT(child) ) {
688 if (SP_IS_ITEM(child)) {
689 SPItem *item = SP_ITEM(child);
690 renderItem(ctx, item);
691 }
692 }
693 TRACE(("END mask\n"));
695 ctx->popState();
696 }
698 void
699 calculatePreserveAspectRatio(unsigned int aspect_align, unsigned int aspect_clip, double vp_width, double vp_height,
700 double *x, double *y, double *width, double *height)
701 {
702 if (aspect_align == SP_ASPECT_NONE)
703 return;
705 double scalex, scaley, scale;
706 double new_width, new_height;
707 scalex = *width / vp_width;
708 scaley = *height / vp_height;
709 scale = (aspect_clip == SP_ASPECT_MEET) ? MIN(scalex, scaley) : MAX(scalex, scaley);
710 new_width = vp_width * scale;
711 new_height = vp_height * scale;
712 /* Now place viewbox to requested position */
713 switch (aspect_align) {
714 case SP_ASPECT_XMIN_YMIN:
715 break;
716 case SP_ASPECT_XMID_YMIN:
717 *x -= 0.5 * (new_width - *width);
718 break;
719 case SP_ASPECT_XMAX_YMIN:
720 *x -= 1.0 * (new_width - *width);
721 break;
722 case SP_ASPECT_XMIN_YMID:
723 *y -= 0.5 * (new_height - *height);
724 break;
725 case SP_ASPECT_XMID_YMID:
726 *x -= 0.5 * (new_width - *width);
727 *y -= 0.5 * (new_height - *height);
728 break;
729 case SP_ASPECT_XMAX_YMID:
730 *x -= 1.0 * (new_width - *width);
731 *y -= 0.5 * (new_height - *height);
732 break;
733 case SP_ASPECT_XMIN_YMAX:
734 *y -= 1.0 * (new_height - *height);
735 break;
736 case SP_ASPECT_XMID_YMAX:
737 *x -= 0.5 * (new_width - *width);
738 *y -= 1.0 * (new_height - *height);
739 break;
740 case SP_ASPECT_XMAX_YMAX:
741 *x -= 1.0 * (new_width - *width);
742 *y -= 1.0 * (new_height - *height);
743 break;
744 default:
745 break;
746 }
747 *width = new_width;
748 *height = new_height;
749 }
751 #include "clear-n_.h"
753 } /* namespace Internal */
754 } /* namespace Extension */
755 } /* namespace Inkscape */
757 #undef TRACE
759 /* End of GNU GPL code */
761 /*
762 Local Variables:
763 mode:c++
764 c-file-style:"stroustrup"
765 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
766 indent-tabs-mode:nil
767 fill-column:99
768 End:
769 */
770 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :