#define __SP_CAIRO_RENDERER_C__ /** \file * Rendering with Cairo. */ /* * Author: * Miklos Erdelyi * * Copyright (C) 2006 Miklos Erdelyi * * Licensed under GNU GPL */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #ifndef PANGO_ENABLE_BACKEND #define PANGO_ENABLE_BACKEND #endif #ifndef PANGO_ENABLE_ENGINE #define PANGO_ENABLE_ENGINE #endif #include #include #include #include #include #include #include #include "libnr/nr-matrix-rotate-ops.h" #include "libnr/nr-matrix-translate-ops.h" #include "libnr/nr-rotate-fns.h" #include "libnr/nr-scale-ops.h" #include "libnr/nr-scale-translate-ops.h" #include "libnr/nr-translate-matrix-ops.h" #include "libnr/nr-translate-scale-ops.h" #include #include #include "display/nr-arena.h" #include "display/nr-arena-item.h" #include "display/nr-arena-group.h" #include "display/curve.h" #include "display/canvas-bpath.h" #include "sp-item.h" #include "sp-item-group.h" #include "style.h" #include "marker.h" #include "sp-linear-gradient.h" #include "sp-radial-gradient.h" #include "sp-root.h" #include "sp-shape.h" #include "sp-use.h" #include "sp-text.h" #include "sp-flowtext.h" #include "sp-image.h" #include "sp-symbol.h" #include "sp-pattern.h" #include "sp-mask.h" #include "sp-clippath.h" #include #include "helper/png-write.h" #include "helper/pixbuf-ops.h" #include "cairo-renderer.h" #include "cairo-render-context.h" #include "extension/system.h" #include "io/sys.h" #include // include support for only the compiled-in surface types #ifdef CAIRO_HAS_PDF_SURFACE #include #endif #ifdef CAIRO_HAS_PS_SURFACE #include #endif //#define TRACE(_args) g_printf _args #define TRACE(_args) // FIXME: expose these from sp-clippath/mask.cpp struct SPClipPathView { SPClipPathView *next; unsigned int key; NRArenaItem *arenaitem; NRRect bbox; }; struct SPMaskView { SPMaskView *next; unsigned int key; NRArenaItem *arenaitem; NRRect bbox; }; namespace Inkscape { namespace Extension { namespace Internal { CairoRenderer::CairoRenderer(void) {} CairoRenderer::~CairoRenderer(void) { /* restore default signal handling for SIGPIPE */ #if !defined(_WIN32) && !defined(__WIN32__) (void) signal(SIGPIPE, SIG_DFL); #endif return; } CairoRenderContext* CairoRenderer::createContext(void) { CairoRenderContext *new_context = new CairoRenderContext(this); g_assert( new_context != NULL ); new_context->_state_stack = NULL; new_context->_state = NULL; // create initial render state CairoRenderState *state = new_context->_createState(); state->transform.set_identity(); new_context->_state_stack = g_slist_prepend(new_context->_state_stack, state); new_context->_state = state; return new_context; } void CairoRenderer::destroyContext(CairoRenderContext *ctx) { delete ctx; } /* Here comes the rendering part which could be put into the 'render' methods of SPItems' */ /* The below functions are copy&pasted plus slightly modified from *_invoke_print functions. */ static void sp_item_invoke_render(SPItem *item, CairoRenderContext *ctx); static void sp_group_render(SPItem *item, CairoRenderContext *ctx); static void sp_use_render(SPItem *item, CairoRenderContext *ctx); static void sp_shape_render(SPItem *item, CairoRenderContext *ctx); static void sp_text_render(SPItem *item, CairoRenderContext *ctx); static void sp_flowtext_render(SPItem *item, CairoRenderContext *ctx); static void sp_image_render(SPItem *item, CairoRenderContext *ctx); static void sp_symbol_render(SPItem *item, CairoRenderContext *ctx); static void sp_asbitmap_render(SPItem *item, CairoRenderContext *ctx); static void sp_shape_render (SPItem *item, CairoRenderContext *ctx) { NRRect pbox; SPShape *shape = SP_SHAPE(item); if (!shape->curve) return; /* fixme: Think (Lauris) */ sp_item_invoke_bbox(item, &pbox, NR::identity(), TRUE); NR::Matrix const i2d = sp_item_i2d_affine(item); SPStyle* style = SP_OBJECT_STYLE (item); CairoRenderer *renderer = ctx->getRenderer(); const_NRBPath bp; bp.path = SP_CURVE_BPATH(shape->curve); ctx->renderPath(&bp, style, &pbox); for (NArtBpath const* bp = SP_CURVE_BPATH(shape->curve); bp->code != NR_END; bp++) { for (int m = SP_MARKER_LOC_START; m < SP_MARKER_LOC_QTY; m++) { if (sp_shape_marker_required (shape, m, bp)) { SPMarker* marker = SP_MARKER (shape->marker[m]); SPItem* marker_item = sp_item_first_item_child (SP_OBJECT (shape->marker[m])); NR::Matrix tr(sp_shape_marker_get_transform(shape, bp)); if (marker->markerUnits == SP_MARKER_UNITS_STROKEWIDTH) { tr = NR::scale(style->stroke_width.computed) * tr; } tr = marker_item->transform * marker->c2p * tr; NR::Matrix old_tr = marker_item->transform; marker_item->transform = tr; renderer->renderItem (ctx, marker_item); marker_item->transform = old_tr; } } } } static void sp_group_render(SPItem *item, CairoRenderContext *ctx) { SPGroup *group = SP_GROUP(item); CairoRenderer *renderer = ctx->getRenderer(); TRACE(("group op: %f\n", SP_SCALE24_TO_FLOAT(SP_OBJECT_STYLE(item)->opacity.value))); GSList *l = g_slist_reverse(group->childList(false)); while (l) { SPObject *o = SP_OBJECT (l->data); if (SP_IS_ITEM(o)) { renderer->renderItem (ctx, SP_ITEM (o)); } l = g_slist_remove (l, o); } } static void sp_use_render(SPItem *item, CairoRenderContext *ctx) { bool translated = false; SPUse *use = SP_USE(item); CairoRenderer *renderer = ctx->getRenderer(); if ((use->x._set && use->x.computed != 0) || (use->y._set && use->y.computed != 0)) { NR::Matrix tp(NR::translate(use->x.computed, use->y.computed)); ctx->pushState(); ctx->transform(&tp); translated = true; } if (use->child && SP_IS_ITEM(use->child)) { renderer->renderItem(ctx, SP_ITEM(use->child)); } if (translated) { ctx->popState(); } } static void sp_text_render(SPItem *item, CairoRenderContext *ctx) { SPText *group = SP_TEXT (item); group->layout.showGlyphs(ctx); } static void sp_flowtext_render(SPItem *item, CairoRenderContext *ctx) { SPFlowtext *group = SP_FLOWTEXT(item); group->layout.showGlyphs(ctx); } static void sp_image_render(SPItem *item, CairoRenderContext *ctx) { SPImage *image; guchar *px; int w, h, rs; image = SP_IMAGE (item); if (!image->pixbuf) return; if ((image->width.computed <= 0.0) || (image->height.computed <= 0.0)) return; px = gdk_pixbuf_get_pixels (image->pixbuf); w = gdk_pixbuf_get_width (image->pixbuf); h = gdk_pixbuf_get_height (image->pixbuf); rs = gdk_pixbuf_get_rowstride (image->pixbuf); double x = image->x.computed; double y = image->y.computed; double width = image->width.computed; double height = image->height.computed; if (image->aspect_align != SP_ASPECT_NONE) { calculatePreserveAspectRatio (image->aspect_align, image->aspect_clip, (double)w, (double)h, &x, &y, &width, &height); } if (image->aspect_clip == SP_ASPECT_SLICE && !ctx->getCurrentState()->has_overflow) { ctx->addClippingRect(image->x.computed, image->y.computed, image->width.computed, image->height.computed); } NR::translate tp(x, y); NR::scale s(width / (double)w, height / (double)h); NR::Matrix t(s * tp); ctx->renderImage (px, w, h, rs, &t, SP_OBJECT_STYLE (item)); } static void sp_symbol_render(SPItem *item, CairoRenderContext *ctx) { SPSymbol *symbol = SP_SYMBOL(item); if (!SP_OBJECT_IS_CLONED (symbol)) return; /* Cloned is actually renderable */ ctx->pushState(); ctx->transform(&symbol->c2p); // apply viewbox if set if (0 /*symbol->viewBox_set*/) { NR::Matrix vb2user; double x, y, width, height; double view_width, view_height; x = 0.0; y = 0.0; width = 1.0; height = 1.0; view_width = symbol->viewBox.x1 - symbol->viewBox.x0; view_height = symbol->viewBox.y1 - symbol->viewBox.y0; calculatePreserveAspectRatio(symbol->aspect_align, symbol->aspect_clip, view_width, view_height, &x, &y,&width, &height); // [itemTransform *] translate(x, y) * scale(w/vw, h/vh) * translate(-vx, -vy); vb2user.set_identity(); vb2user[0] = width / view_width; vb2user[3] = height / view_height; vb2user[4] = x - symbol->viewBox.x0 * vb2user[0]; vb2user[5] = y - symbol->viewBox.y0 * vb2user[3]; ctx->transform(&vb2user); } sp_group_render(item, ctx); ctx->popState(); } static void sp_root_render(SPItem *item, CairoRenderContext *ctx) { SPRoot *root = SP_ROOT(item); CairoRenderer *renderer = ctx->getRenderer(); if (!ctx->getCurrentState()->has_overflow && SP_OBJECT(item)->parent) ctx->addClippingRect(root->x.computed, root->y.computed, root->width.computed, root->height.computed); ctx->pushState(); renderer->setStateForItem(ctx, item); ctx->transform(&root->c2p); sp_group_render(item, ctx); ctx->popState(); } /** this function convert the item to a raster image and include the raster into the cairo renderer */ static void sp_asbitmap_render(SPItem *item, CairoRenderContext *ctx) { g_warning("render as bitmap"); //the code now was copied from sp_selection_create_bitmap_copy SPDocument *document = SP_OBJECT(item)->document; Inkscape::XML::Document *xml_doc = sp_document_repr_doc(document); // Get the bounding box of the selection //NR::Maybe _bbox = item->getBounds(sp_item_i2d_affine(item)); // NRRect bbox = item->getBounds(sp_item_i2d_affine(item)); NRRect bbox(item->getBounds(sp_item_i2d_affine(item))); // List of the items to show; all others will be hidden GSList *items = NULL; //g_slist_copy ((GSList *) selection->itemList()); items = g_slist_append(items, item); // Remember parent and z-order of the topmost one gint pos = SP_OBJECT_REPR(g_slist_last(items)->data)->position(); SPObject *parent_object = SP_OBJECT_PARENT(g_slist_last(items)->data); Inkscape::XML::Node *parent = SP_OBJECT_REPR(parent_object); // Calculate resolution double res; /** @TODO reimplement the resolution stuff */ res = ctx->getBitmapResolution(); if(res == 0) { res = PX_PER_IN; } // The width and height of the bitmap in pixels unsigned width = (unsigned) floor ((bbox.x1 - bbox.x0) * res / PX_PER_IN); unsigned height =(unsigned) floor ((bbox.y1 - bbox.y0) * res / PX_PER_IN); // Find out if we have to run a filter gchar const *run = NULL; gchar const *filter = NULL; /** @TODO reimplement the filter stuff //gchar const *filter = prefs_get_string_attribute ("options.createbitmap", "filter"); if (filter) { // filter command is given; // see if we have a parameter to pass to it gchar const *param1 = prefs_get_string_attribute ("options.createbitmap", "filter_param1"); if (param1) { if (param1[strlen(param1) - 1] == '%') { // if the param string ends with %, interpret it as a percentage of the image's max dimension gchar p1[256]; g_ascii_dtostr (p1, 256, ceil (g_ascii_strtod (param1, NULL) * MAX(width, height) / 100)); // the first param is always the image filename, the second is param1 run = g_strdup_printf ("%s \"%s\" %s", filter, filepath, p1); } else { // otherwise pass the param1 unchanged run = g_strdup_printf ("%s \"%s\" %s", filter, filepath, param1); } } else { // run without extra parameter run = g_strdup_printf ("%s \"%s\"", filter, filepath); } } */ // Calculate the matrix that will be applied to the image so that it exactly overlaps the source objects NR::Matrix eek = sp_item_i2d_affine (SP_ITEM(parent_object)); NR::Matrix t; double shift_x = bbox.x0; double shift_y = bbox.y1; if (res == PX_PER_IN) { // for default 90 dpi, snap it to pixel grid shift_x = round (shift_x); shift_y = -round (-shift_y); // this gets correct rounding despite coordinate inversion, remove the negations when the inversion is gone } t = (NR::Matrix)(NR::scale(1, -1) * (NR::Matrix)(NR::translate (shift_x, shift_y)* eek.inverse())); //t = t * ((NR::Matrix)ctx->getCurrentState()->transform).inverse(); // Do the export GdkPixbuf *pb = sp_generate_internal_bitmap(document, NULL, bbox.x0, bbox.y0, bbox.x1, bbox.y1, width, height, res, res, (guint32) 0xffffff00, items ); // Run filter, if any /* if (run) { g_print ("Running external filter: %s\n", run); system (run); } */ if (pb) { unsigned char *px = gdk_pixbuf_get_pixels (pb); unsigned int w = gdk_pixbuf_get_width(pb); unsigned int h = gdk_pixbuf_get_height(pb); unsigned int rs = gdk_pixbuf_get_rowstride(pb); NR::Matrix matrix; matrix = t; //matrix = ((NR::Matrix)ctx->getCurrentState()->transform).inverse(); //matrix.set_identity(); ctx->renderImage (px, w, h, rs, &matrix, SP_OBJECT_STYLE (item)); /* // Create the repr for the image Inkscape::XML::Node * repr = xml_doc->createElement("svg:image"); repr->setAttribute("xlink:href", filename); repr->setAttribute("sodipodi:absref", filepath); if (res == PX_PER_IN) { // for default 90 dpi, snap it to pixel grid sp_repr_set_svg_double(repr, "width", width); sp_repr_set_svg_double(repr, "height", height); } else { sp_repr_set_svg_double(repr, "width", (bbox.x1 - bbox.x0)); sp_repr_set_svg_double(repr, "height", (bbox.y1 - bbox.y0)); } // Write transform gchar *c=sp_svg_transform_write(t); repr->setAttribute("transform", c); g_free(c); // add the new repr to the parent parent->appendChild(repr); // move to the saved position repr->setPosition(pos > 0 ? pos + 1 : 1); */ gdk_pixbuf_unref (pb); } g_slist_free (items); } static void sp_item_invoke_render(SPItem *item, CairoRenderContext *ctx) { // Check item's visibility if (item->isHidden()) { return; } SPStyle* style = SP_OBJECT_STYLE (item); if((ctx->getFilterToBitmap() == TRUE) && (style->filter.set != 0)) { return sp_asbitmap_render(item, ctx); } if (SP_IS_ROOT(item)) { TRACE(("root\n")); return sp_root_render(item, ctx); } else if (SP_IS_GROUP(item)) { TRACE(("group\n")); return sp_group_render(item, ctx); } else if (SP_IS_SHAPE(item)) { TRACE(("shape\n")); return sp_shape_render(item, ctx); } else if (SP_IS_USE(item)) { TRACE(("use begin---\n")); sp_use_render(item, ctx); TRACE(("---use end\n")); } else if (SP_IS_SYMBOL(item)) { TRACE(("symbol\n")); return sp_symbol_render(item, ctx); } else if (SP_IS_TEXT(item)) { TRACE(("text\n")); return sp_text_render(item, ctx); } else if (SP_IS_FLOWTEXT(item)) { TRACE(("flowtext\n")); return sp_flowtext_render(item, ctx); } else if (SP_IS_IMAGE(item)) { TRACE(("image\n")); return sp_image_render(item, ctx); } } void CairoRenderer::setStateForItem(CairoRenderContext *ctx, SPItem const *item) { SPStyle const *style = SP_OBJECT_STYLE(item); ctx->setStateForStyle(style); CairoRenderState *state = ctx->getCurrentState(); state->clip_path = item->clip_ref->getObject(); state->mask = item->mask_ref->getObject(); // If parent_has_userspace is true the parent state's transform // has to be used for the mask's/clippath's context. // This is so because we use the image's/(flow)text's transform for positioning // instead of explicitly specifying it and letting the renderer do the // transformation before rendering the item. if (SP_IS_TEXT(item) || SP_IS_FLOWTEXT(item) || SP_IS_IMAGE(item)) state->parent_has_userspace = TRUE; TRACE(("set op: %f\n", state->opacity)); } void CairoRenderer::renderItem(CairoRenderContext *ctx, SPItem *item) { ctx->pushState(); setStateForItem(ctx, item); CairoRenderState *state = ctx->getCurrentState(); state->need_layer = ( state->mask || state->clip_path || state->opacity != 1.0 ); if (state->need_layer) { state->merge_opacity = FALSE; ctx->pushLayer(); } ctx->transform(&item->transform); sp_item_invoke_render(item, ctx); if (state->need_layer) ctx->popLayer(); ctx->popState(); } bool CairoRenderer::setupDocument(CairoRenderContext *ctx, SPDocument *doc) { g_assert( ctx != NULL ); if (ctx->_vector_based_target) { // width and height in pt ctx->_width = sp_document_width(doc) * PT_PER_PX; ctx->_height = sp_document_height(doc) * PT_PER_PX; } else { ctx->_width = sp_document_width(doc); ctx->_height = sp_document_height(doc); } NRRect d; bool pageBoundingBox = true; if (pageBoundingBox) { d.x0 = d.y0 = 0; d.x1 = ceil(ctx->_width); d.y1 = ceil(ctx->_height); } else { SPItem* doc_item = SP_ITEM(sp_document_root(doc)); sp_item_invoke_bbox(doc_item, &d, sp_item_i2r_affine(doc_item), TRUE); if (ctx->_vector_based_target) { // convert from px to pt d.x0 *= PT_PER_PX; d.x1 *= PT_PER_PX; d.y0 *= PT_PER_PX; d.y1 *= PT_PER_PX; } } TRACE(("%f x %f\n", ctx->_width, ctx->_height)); return ctx->setupSurface(d.x1-d.x0, d.y1-d.y0); } #include "macros.h" // SP_PRINT_* void CairoRenderer::applyClipPath(CairoRenderContext *ctx, SPClipPath const *cp) { g_assert( ctx != NULL && ctx->_is_valid ); if (cp == NULL) return; CairoRenderContext::CairoRenderMode saved_mode = ctx->getRenderMode(); ctx->setRenderMode(CairoRenderContext::RENDER_MODE_CLIP); NR::Matrix saved_ctm; if (cp->clipPathUnits == SP_CONTENT_UNITS_OBJECTBOUNDINGBOX) { //SP_PRINT_DRECT("clipd", cp->display->bbox); NRRect clip_bbox(cp->display->bbox); NR::Matrix t(NR::scale(clip_bbox.x1 - clip_bbox.x0, clip_bbox.y1 - clip_bbox.y0)); t[4] = clip_bbox.x0; t[5] = clip_bbox.y0; t *= ctx->getCurrentState()->transform; ctx->getTransform(&saved_ctm); ctx->setTransform(&t); } TRACE(("BEGIN clip\n")); SPObject *co = SP_OBJECT(cp); for (SPObject *child = sp_object_first_child(co) ; child != NULL; child = SP_OBJECT_NEXT(child) ) { if (SP_IS_ITEM(child)) { SPItem *item = SP_ITEM(child); renderItem(ctx, item); } } TRACE(("END clip\n")); // do clipping only if this was the first call to applyClipPath if (ctx->getClipMode() == CairoRenderContext::CLIP_MODE_PATH && saved_mode == CairoRenderContext::RENDER_MODE_NORMAL) cairo_clip(ctx->_cr); if (cp->clipPathUnits == SP_CONTENT_UNITS_OBJECTBOUNDINGBOX) ctx->setTransform(&saved_ctm); ctx->setRenderMode(saved_mode); } void CairoRenderer::applyMask(CairoRenderContext *ctx, SPMask const *mask) { g_assert( ctx != NULL && ctx->_is_valid ); if (mask == NULL) return; //SP_PRINT_DRECT("maskd", &mask->display->bbox); NRRect mask_bbox(mask->display->bbox); // TODO: should the bbox be transformed if maskUnits != userSpaceOnUse ? if (mask->maskContentUnits == SP_CONTENT_UNITS_OBJECTBOUNDINGBOX) { NR::Matrix t(NR::scale(mask_bbox.x1 - mask_bbox.x0, mask_bbox.y1 - mask_bbox.y0)); t[4] = mask_bbox.x0; t[5] = mask_bbox.y0; t *= ctx->getCurrentState()->transform; ctx->setTransform(&t); } // clip mask contents ctx->addClippingRect(mask_bbox.x0, mask_bbox.y0, mask_bbox.x1 - mask_bbox.x0, mask_bbox.y1 - mask_bbox.y0); ctx->pushState(); TRACE(("BEGIN mask\n")); SPObject *co = SP_OBJECT(mask); for (SPObject *child = sp_object_first_child(co) ; child != NULL; child = SP_OBJECT_NEXT(child) ) { if (SP_IS_ITEM(child)) { SPItem *item = SP_ITEM(child); renderItem(ctx, item); } } TRACE(("END mask\n")); ctx->popState(); } void calculatePreserveAspectRatio(unsigned int aspect_align, unsigned int aspect_clip, double vp_width, double vp_height, double *x, double *y, double *width, double *height) { if (aspect_align == SP_ASPECT_NONE) return; double scalex, scaley, scale; double new_width, new_height; scalex = *width / vp_width; scaley = *height / vp_height; scale = (aspect_clip == SP_ASPECT_MEET) ? MIN(scalex, scaley) : MAX(scalex, scaley); new_width = vp_width * scale; new_height = vp_height * scale; /* Now place viewbox to requested position */ switch (aspect_align) { case SP_ASPECT_XMIN_YMIN: break; case SP_ASPECT_XMID_YMIN: *x -= 0.5 * (new_width - *width); break; case SP_ASPECT_XMAX_YMIN: *x -= 1.0 * (new_width - *width); break; case SP_ASPECT_XMIN_YMID: *y -= 0.5 * (new_height - *height); break; case SP_ASPECT_XMID_YMID: *x -= 0.5 * (new_width - *width); *y -= 0.5 * (new_height - *height); break; case SP_ASPECT_XMAX_YMID: *x -= 1.0 * (new_width - *width); *y -= 0.5 * (new_height - *height); break; case SP_ASPECT_XMIN_YMAX: *y -= 1.0 * (new_height - *height); break; case SP_ASPECT_XMID_YMAX: *x -= 0.5 * (new_width - *width); *y -= 1.0 * (new_height - *height); break; case SP_ASPECT_XMAX_YMAX: *x -= 1.0 * (new_width - *width); *y -= 1.0 * (new_height - *height); break; default: break; } *width = new_width; *height = new_height; } #include "clear-n_.h" } /* namespace Internal */ } /* namespace Extension */ } /* namespace Inkscape */ #undef TRACE /* End of GNU GPL code */ /* Local Variables: mode:c++ c-file-style:"stroustrup" c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +)) indent-tabs-mode:nil fill-column:99 End: */ // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :